Semiconductor lasers are compact, efficient and reliable light sources playing a crucial role in many modern technological systems. For example, narrow-waveguide edge-emitting multisection lasers and coupled laser devices admitting ten- and even hundred-GHz-range field intensity oscillations or state switching are broadly used in optical communications. Various configurations of broad-area semiconductor lasers can achieve several tens of Watt emission power. Such lasers are used in free space communications, three- dimensional printing, marking, materials processing, pumping of fiber amplifiers, or optical frequency conversion.
Depending on parameters and on laser geometry all these lasers demonstrate a variety of complicated dynamical regimes. A comprehensive study of the underlying nonlinear processes and bifurcation analysis leads to a better understanding of the observed behavior and enables the design of new types of laser devices for specific purposes.

Highlights

For a mathematical description of complex devices with structures from the scale of nm up to mm, one has to use efficient models on different levels of complexity.



Fig. 1: Schematics of a Fourier domain mode-locked laser (a), a three-section Distributed Feedback laser (b), and a tapered Master-Oscillator Power-Amplifier laser (c).

The most simple rate equation (ODE) models can recover a qualitative dynamics of some mutually coupled lasers or lasers with an optical injection. For simulation and analysis of conventional or Fourier-domain mode-locked lasers (see Fig. 1a) and of laser systems with delayed feedback or coupling, one can use more complex delay differential equation (DDE) models. The spatiotemporal dynamical behavior of more general edge-emitting multisection semiconductor laser devices and coupled laser systems (see Fig. 1b) can be described by systems of dissipative 1+1 dimensional hyperbolic PDEs (Travelling-Wave equations for the longitudinal optical fields) nonlinearly coupled to systems of ODEs for carrier densities. For tapered and broad area lasers (see Fig. 1c), the lateral space dimension has to be taken into account which leads to coupled systems of nonlinear degenerated second order PDEs. As a particular feature, these models typically include effects on different scales in space and time and have discontinuous coefficients (heterostructures).

Publications

  Monographs

  • I. Laukaityte, R. Čiegis, M. Lichtner, M. Radziunas, Parallel Numerical Algorithm for the Traveling Wave Model, in: Parallel Scientific Computing and Optimization: Advances and Applications, R. Čiegis, D. Henty, B. Kågström, J. Žilinskas, eds., 27 of Springer Optimization and Its Applications, Springer, New York, 2008, pp. 237-251, (Chapter Published).

  • M. Radziunas, H.-J. Wünsche, Chapter 5: Multisection Lasers: Longitudinal Modes and Their Dynamics, in: Optoelectronic Devices --- Advanced Simulation and Analysis, J. Piprek, ed., Springer, New York, 2005, pp. 121--150, (Chapter Published).

  • U. Bandelow, H. Gajewski, R. Hünlich, Chapter 3: Fabry--Perot Lasers: Thermodynamics-based Modeling, in: Optoelectronic Devices --- Advanced Simulation and Analysis, J. Piprek, ed., Springer, New York, 2005, pp. 63-85, (Chapter Published).

  • H.-J. Wünsche, J. Piprek, U. Bandelow, H. Wenzel, eds., Proceedings of the 5th International Conference on ``Numerical Simulation of Optoelectronic Devices'' (NUSOD '05) in Berlin, September 19--22, 2005, IEEE, Piscataway, NJ, 2005, 134 pages, (Collection Published).

  Articles in Refereed Journals

  • D. Peschka, M. Thomas, A. Glitzky, R. Nürnberg, M. Virgilio, S. Guha, Th. Schröder, G. Cappellini, Th. Koprucki, Robustness analysis of a device concept for edge-emitting lasers based on strained germanium, Optical and Quantum Electronics, 48 (2016) pp. 156/1--156/7.
    Abstract
    We consider a device concept for edge-emitting lasers based on strained germanium microstrips. The device features an inhomogeneous tensile strain distribution generated by a SiN stressor deposited on top of the Ge microstrip. This geometry requires a lateral contact scheme and hence a full two-dimensional description. The two-dimensional simulations of the carrier transport and of the optical field, carried out in a cross section of the device orthogonal to the optical cavity, use microscopic calculations of the strained Ge material gain as an input. In this paper we study laser performance and robustness against Shockley-Read-Hall lifetime variations and device sensitivity to different strain distributions.

  • G. Slavcheva, A.V. Gorbach, A. Pimenov, Coupled spatial multimode solitons in microcavity wires, Phys. Rev. B., 94 (2016) pp. 245432/1--245432/13, DOI 10.1103/PhysRevB.94.245432 .
    Abstract
    A modal expansion approach is developed and employed to investigate and elucidate the nonlinear mechanism behind the multistability and formation of coupled multimode polariton solitons in microcavity wires. With pump switched on and realistic dissipation parameters, truncating the expansion up to the second-order wire mode, our model predicts two distinct coupled soliton branches: stable and unstable. Modulational stability of the stationary homogeneous solution and soliton branches stability are studied. Our simplified 1D model is in remarkably good agreement with the full 2D mean-field Gross-Pitaevskii model, reproducing correctly the soliton existence domain upon variation of pump amplitude and the onset of multistability.

  • R.M. Arkhipov, T. Habruseva, A. Pimenov, M. Radziunas, G. Huyet, A.G. Vladimirov, Semiconductor mode-locked lasers with coherent dual mode optical injection: Simulations, analysis and experiment, Journal of the Optical Society of America. B, 33 (2016) pp. 351--359.
    Abstract
    Using a delay differential equations model we study the dynamics of a passively mode-locked semiconductor laser with dual frequency coherent optical injection. The locking regions where the laser pulse repetition rate is synchronized to the separation of the two injected frequencies were calculated numerically and measured experimentally. Asymptotic analysis performed in the limit of the small injection field amplitude revealed the dependence of the locking regions on the model parameters, such as optical bandwith, absorber recovery time and linear losses.

  • D. Puzyrev, A.G. Vladimirov, S.V. Gurevich, S. Yanchuk, Modulational instability and zigzagging of dissipative solitons induced by delayed feedback, Physical Review A, 93 (2016) pp. 041801/1--041801/5.
    Abstract
    We report a destabilization mechanism of localized solutions in spatially extended systems which is induced by delayed feedback. Considering a model of a wide-aperture laser with a saturable absorber and delayed optical feedback, we demonstrate the appearance of multiple coexistent laser cavity solitons. We show that at large delays apart from the drift and phase instabilities the soliton can exhibit a delay-induced modulational instability associated with the translational neutral mode. The combination of drift and modulational instabilities produces a zigzagging motion of the solitons, which are either periodic, with the period close to the delay time, or chaotic, with low-frequency fluctuations in the direction of the soliton motion. The same type of modulational instability is demonstrated for localized solutions of the cubic-quintic complex Ginzburg-Landau equation.

  • M. Radziunas, New multi-mode delay differential equation model for lasers with optical feedback, Optical and Quantum Electronics, 48 (2016) pp. 1--9.
    Abstract
    In this paper, we discuss the relations between the spatially-distributed traveling wave, Lang-Kobayashi, and a new multi-mode delay differential equation models for Fabry-Perot type semiconductor diode lasers with an external optical feedback. All these models govern the dynamics of the slowly varying complex amplitudes of the optical fields and carrier density. To compare the models, we calculate the cavity modes determined by the threshold carrier density and optical frequency of the steady states in all three models. These calculations show that the Lang-Kobayashi type model is in good agreement with the traveling wave model only for the small feedback regimes, whereas newly derived multi-mode delay differential equation model remains correct even at moderate and large optical feedback regimes.

  • L. Jaurigue, A. Pimenov, D. Rachinskii, E. Schöll, K. Lüdge, A.G. Vladimirov, Timing jitter of passively-mode-locked semiconductor lasers subject to optical feedback: A semi-analytic approach, Physical Review A, 92 (2015) pp. 053807/1--053807/11.
    Abstract
    We propose a semi-analytical method of calculating the timing fluctuations in mode-locked semiconductor lasers and apply it to study the effect of delayed coherent optical feedback on pulse timing jitter in these lasers. The proposed method greatly reduces computation times and therefore allows for the investigation of the dependence of timing fluctuations over greater parameter domains. We show that resonant feedback leads to a reduction in the timing jitter and that a frequency-pulling region forms about the main resonances, within which a timing jitter reduction is observed. The width of these frequency-pulling regions increases linearly with short feedback delay times. We derive an analytic expression for the timing jitter, which predicts a monotonic decrease in the timing jitter for resonant feedback of increasing delay lengths, when timing jitter effects are fully separated from amplitude jitter effects. For long feedback cavities the decrease in timing jitter scales approximately as $1/tau$ with the increase of the feedback delay time $tau$.

  • W. Ahmed, S. Kumar, R. Herrero, M. Botey, M. Radziunas, K. Staliunas, Stabilization of flat-mirror vertical-external-cavity surface-emitting lasers by spatiotemporal modulation of the pump profile, Physical Review A, 92 (2015) pp. 043829/1--043829/8.
    Abstract
    We propose and demonstrate theoretically that vertical-external-cavity surface-emitting lasers (VECSELs) with external flat mirrors can be stabilized by applying a periodic spatiotemporal modulation of the pump current. Such pump modulation is shown to suppress the pattern-forming instabilities (modulation instabilities), which eventually results in stable beam emission. A modified Floquet linear stability analysis is used to characterize the dynamics of the modulated system and to evaluate its stabilization performance. Stability maps identify the regions in parameter space for complete and partial stabilization of VECSELs operating in different regimes depending on the external-cavity length. In particular, the stabilization method is shown to operate most efficiently in Class-A laser limit (for relatively long VECSEL resonators), while it becomes ineffective in Class-B laser limit (for relatively short resonators). The stabilization effect is further confirmed through direct integration of the dynamical equations.

  • V.Z. Tronciu, M. Radziunas, Ch. Kürbis, H. Wenzel, A. Wicht, Numerical and experimental investigations of micro-integrated external cavity diode lasers, Optical and Quantum Electronics, 47 (2015) pp. 1459--1464.

  • M. Radziunas, R. Herrero, M. Botey, K. Staliunas, Far-field narrowing in spatially modulated broad-area edge-emitting semiconductor amplifiers, Journal of the Optical Society of America. B, 32 (2015) pp. 993--1000.
    Abstract
    We perform a detailed theoretical analysis of the far field narrowing in broad-area edgeemitting semiconductor amplifiers that are electrically injected through the contacts periodically modulated in both, longitudinal and transverse, directions. The beam propagation properties within the semiconductor amplifier are explored by a (1+2)-dimensional traveling wave model and its coupled mode approximation. Assuming a weak field regime, we analyze the impact of different parameters and modulation geometry on the narrowing of the principal far field component.

  • M. Radziunas, V.Z. Tronciu, E. Luvsandamdin, Ch. Kürbis, A. Wicht, H. Wenzel, Study of micro-integrated external-cavity diode lasers: Simulations, analysis and experiments, IEEE J. Quantum Electron., 51 (2015) pp. 2000408/1--2000408/8.
    Abstract
    This paper reports the results of numerical and experimental investigations of the dynamics of an external cavity diode laser device composed of a semiconductor laser and a distant Bragg grating, which provides an optical feedback. Due to the influence of the feedback, this system can operate at different dynamic regimes. The traveling wave model is used for simulations and analysis of the nonlinear dynamics in the considered laser device. Based on this model, a detailed analysis of the optical modes is performed, and the stability of the stationary states is discussed. It is shown, that the results obtained from the simulation and analysis of the device are in good agreement with experimental findings.

  • M. Radziunas, Longitudinal modes of multisection edge-emitting and ring semiconductor lasers, Optical and Quantum Electronics, 47 (2015) pp. 1319--1325.
    Abstract
    We use the traveling wave model for simulating and analyzing nonlinear dynamics of multisection ring and edge-emitting semiconductor laser devices. We introduce the concept of instantaneous longitudinal optical modes and present an algorithm for their computation. A semiconductor ring laser was considered to illustrate the advantages of the mode analysis.

  • A. Pimenov, E.A. Viktorov, S.P. Hegarty, T. Habruseva, G. Huyet, D. Rachinskii, A.G. Vladimirov, Bistability and hysteresis in an optically injected two-section semiconductor laser, Phys. Rev. E (3), 89 (2014) pp. 052903/1--052903/7.
    Abstract
    The effect of coherenct single frequency injection in two-section semiconductor lasers is studied numerically using a model based on a set of delay differential equations. The existence of bistability between different CW and non-stationary regimes of operation is demonstrated in the case of sufficiently large linewidth enhancement factors.

  • M. Radziunas, R. Čiegis, A. Mirinavičius, On compact high order finite difference schemes for linear Schrödinger problem on non-uniform meshes, International Journal of Numerical Analysis and Modeling. Wuhan University, Wuhan and Institute for Scientific Computing and Information(ISCI), Edmonton, Alberta. English., 11 (2014) pp. 303--314.

  • M. Tlidi, K. Staliunas, K. Panajotov, A.G. Vladimirov, M.G. Clerc, Introduction: Localized structures in dissipative media: From optics to plant ecology, Philosophical Transactions of the Royal Society A : Mathematical, Physical & Engineering Sciences, 372 (2014) pp. 20140101/1--20140101/18.
    Abstract
    We investigate a control of the motion of localized structures of light by means of delay feedback in the transverse section of a broad area nonlinear optical system. The delayed feedback is found to induce a spontaneous motion of a solitary localized structure that is stationary and stable in the absence of feedback. We focus our analysis on an experimentally relevant system namely the Vertical-Cavity Surface-Emitting Laser (VCSEL). In the absence of the delay feedback we present experimental evidence of stationary localized structures in a 80 ?m aperture VCSEL. The spontaneous formation of localized structures takes place above the lasing threshold and under optical injection. Then, we consider the effect of the time-delayed optical feedback and investigate analytically the role of the phase of the feedback and the carrier lifetime on the self-mobility properties of the localized structures. We show that these two parameters affect strongly the space time dynamics of two-dimensional localized structures. We derive an analytical formula for the threshold associated with drift instability of localized structures and a normal form equation describing the slow time evolution of the speed of the moving structure.

  • A. Pérez-Serrano, J. Javaloyes, S. Balle, Directional reversals and multimode dynamics in semiconductor ring lasers, Physical Review A, 89 (2014) pp. 023818/1--023818/14.
    Abstract
    We investigate the dynamics of longitudinal modes in quantum-well semiconductor ring lasers by means of a spatio-temporal travelling wave model. We report the existence of a novel multimode instability in such a system that provokes a periodic deterministic directional reversal involving jumps between consecutive longitudinal modes. The switching sequence follows the modal frequencies from blue to red, and every modal jump is accompanied by a reversal of the direction of emission. We characterize and analyze such instability via the bifurcation analysis of the full travelling wave model as well as by performing the linear stability analysis of the monochromatic solutions.

  • M. Radziunas, R. Čiegis, Effective numerical algorithm for simulations of beam stabilization in broad area semiconductor lasers and amplifiers, Mathematical Modelling and Analysis. Matematinis Modeliavimis ir Analize. The Baltic Journal on Mathematical Applications, Numerical Analysis and Differential Equations, 19 (2014) pp. 627--646.

  • R.M. Arkhipov, A. Pimenov, M. Radziunas, A.G. Vladimirov, D. Arsenjević, D. Rachinskii, H. Schmeckebier, D. Bimberg, Hybrid mode-locking in edge-emitting semiconductor lasers: Simulations, analysis and experiments, IEEE J. Select. Topics Quantum Electron., 19 (2013) pp. 1100208/1--1100208/6.
    Abstract
    Hybrid mode-locking in a two section edge-emitting semiconductor laser is studied numerically and analytically using a set of three delay differential equations. In this set the external RF signal applied to the saturable absorber section is modeled by modulation of the carrier relaxation rate in this section. Estimation of the locking range where the pulse repetition frequency is synchronized with the frequency of the external modulation is performed numerically and the effect of the modulation shape and amplitude on this range is investigated. Asymptotic analysis of the dependence of the locking range width on the laser parameters is carried out in the limit of small signal modulation. Our numerical simulations indicate that hybrid mode-locking can be also achieved in the cases when the frequency of the external modulation is approximately twice larger and twice smaller than the pulse repetition frequency of the free running passively mode-locked laser fP . Finally, we provide an experimental demonstration of hybrid mode-locking in a 20 GHz quantum-dot laser with the modulation frequency of the reverse bias applied to the absorber section close to fP =2.

  • A. Pérez-Serrano, J. Javaloyes, S. Balle, Multi-channel wavelength conversion using four-wave mixing in semiconductor ring lasers, IEEE Phot. Tech. Letter, 25 (2013) pp. 476--479.
    Abstract
    We theoretically study all-optical simultaneous wavelength conversion of multiple channels by four-wave mixing in semiconductor ring lasers. Locking the semiconductor ring laser to a holding beam allows to achieve large conversion efficiencies with good signal-tonoise ratio in several channels at multi-Gb/s bit rates. Cross-talk between signals, arising from the peculiar four-wave mixing cascade of modes in semiconductor ring lasers and their cross-gain saturation, is studied in detail. We show that it can be controlled by adjusting the intensity of the holding beam, the bias current of the laser and the number, intensity and wavelength of signals that one wants to convert.

  • A. Pérez-Serrano, J. Javaloyes, S. Balle, Spectral delay algebraic equation approach to broad area laser diodes, IEEE J. Select. Topics Quantum Electron., 19 (2013) pp. 1502808/1--1502808/8.

  • A. Pimenov, A.G. Vladimirov, S.V. Gurevich, K. Panajotov, G. Huyet, M. Tlidi, Delayed feedback control of self-mobile cavity solitons, Physical Review A, 88 (2013) pp. 053830/1--053830/11.
    Abstract
    Control of the motion of cavity solitons is one the central problems in nonlinear optical pattern formation. We report on the impact of the phase of the time-delayed optical feedback and carrier lifetime on the self-mobility of localized structures of light in broad area semiconductor cavities. We show both analytically and numerically that the feedback phase strongly affects the drift instability threshold as well as the velocity of cavity soliton motion above this threshold. In addition we demonstrate that non-instantaneous carrier response in the semiconductor medium is responsible for the increase in critical feedback rate corresponding to the drift instability.

  • M. Radziunas, M. Botey, R. Herrero, K. Staliunas, Intrinsic beam shaping mechanism in spatially modulated broad area semiconductor amplifiers, Applied Physics Letters, 103 (2013) pp. 132101/1--132101/4.
    Abstract
    We investigate beam shaping in broad area semiconductor amplifiers induced by a periodic modulation of the pump on a scale of several microns. The study is performed by solving numerically a (2+1)-dimensional model for the semiconductor amplifier. We show that, under realistic conditions, the anisotropic gain induced by the pump periodicity can show narrow angular profile of enhanced gain of less than one degree, providing an intrinsic filtering mechanism and eventually improving the spatial beam quality.

  • A. Wilms, P. Mathé, F. Schulze, Th. Koprucki, A. Knorr, U. Bandelow, Influence of the carrier reservoir dimensionality on electron-electron scattering in quantum dot materials, Phys. Rev. B., 88 (2013) pp. 235421/1--235421/11.
    Abstract
    We calculated Coulomb scattering rates from quantum dots (QDs) coupled to a 2D carrier reservoir and QDs coupled to a 3D reservoir. For this purpose, we used a microscopic theory in the limit of Born-Markov approximation, in which the numerical evaluation of high dimensional integrals is done via a quasi-Monte Carlo method. Via a comparison of the so determined scattering rates, we investigated the question whether scattering from 2D is generally more efficient than scattering from 3D. In agreement with experimental findings, we did not observe a significant reduction of the scattering efficiency of a QD directly coupled to a 3D reservoir. In turn, we found that 3D scattering benefits from it?s additional degree of freedom in the momentum space.

  • S. Slepneva, B. Kelleher, B. O'Shaughnessy, S.P. Hegarty, A.G. Vladimirov, G. Huyet, Dynamics of Fourier domain mode-locked lasers, Optics Express, 21 (2013) pp. 19240--19251.

  • R. Čiegis, A. Mirinavičius, M. Radziunas, Comparison of split step solvers for multidimensional Schrödinger problems, Computational Methods in Applied Mathematics, 13 (2013) pp. 237--250.
    Abstract
    Hybrid mode-locking in a two section edge-emitting semiconductor laser is studied numerically and analytically using a set of three delay differential equations. In this set the external RF signal applied to the saturable absorber section is modeled by modulation of the carrier relaxation rate in this section. Estimation of the locking range where the pulse repetition frequency is synchronized with the frequency of the external modulation is performed numerically and the effect of the modulation shape and amplitude on this range is investigated. Asymptotic analysis of the dependence of the locking range width on the laser parameters is carried out in the limit of small signal modulation. Our numerical simulations indicate that hybrid mode-locking can be also achieved in the cases when the frequency of the external modulation is approximately twice larger and twice smaller than the pulse repetition frequency of the free running passively mode-locked laser fP . Finally, we provide an experimental demonstration of hybrid mode-locking in a 20 GHz quantum-dot laser with the modulation frequency of the reverse bias applied to the absorber section close to fP =2.

  • A. Pimenov, V.Z. Tronciu, U. Bandelow, A.G. Vladimirov, Dynamical regimes of multi-stripe laser array with external off-axis feedback, Journal of the Optical Society of America. B, 30 (2013) pp. 1606--1613.
    Abstract
    We study theoretically the dynamics of a multistripe laser array with an external cavity formed by either a single or two off-axis feedback mirrors, which allow to select a single lateral mode with transversely modulated intensity distribution. We derive and analyze a reduced model of such an array based on a set of delay differential equations taking into account transverse carrier grating in the semiconductor medium. With the help of the bifurcation analysis of the reduced model we show the existence of single and multimode instabilities leading to periodic and irregular pulsations of the output intensity. In particular, we observe a multimode instability leading to a periodic regime with anti-phase oscillating intensities of the two counter-propagating waves in the external cavity. This is in agreement with the result obtained earlier with the help of a 2+1 dimensional traveling wave model.

  • A. Wilms, D. Breddermann, P. Mathé, Theory of direct capture from two- and three-dimensional reservoirs to quantum dot states, physica status solidi (c), 9 (2012) pp. 1278--1281.

  • T. Habruseva, S.P. Hegarty, A.G. Vladimirov, A. Pimenov, D. Rachinskii, N. Rebrova, E.A. Viktorov, G. Huyet, Bistable regimes in an optically injected mode-locked laser, Optics Express, 20 (2012) pp. 25572--25583.

  • M. Lichtner, V.Z. Tronciu, A.G. Vladimirov, Theoretical investigations of striped and non-striped broad area lasers with off-axis feedback, IEEE J. Quantum Electron., 48 (2012) pp. 353--360.

  • M. Tlidi, E. Averlant, A.G. Vladimirov, K. Panajotov, Delay feedback induces a spontaneous motion of two-dimensional cavity solitons in driven semiconductor microcavities, Physical Review A, 86 (2012) pp. 033822/1--033822/8.

  • D. Turaev, A.G. Vladimirov, S. Zelik, Long range interaction and synchronization of oscillating dissipative solitons, Physical Review Letters, 108 (2012) pp. 263906/1--263906/5.

  • M. Radziunas, A.G. Vladimirov, E.A. Viktorov, G. Fiol, H. Schmeckebier, D. Bimberg, Pulse broadening in quantum-dot mode-locked semiconductor lasers: Simulation, analysis and experiments, IEEE J. Quantum Electron., 47 (2011) pp. 935-943.
    Abstract
    We consider a mode-locked quantum-dot edge-emitting semiconductor laser consisting of a reverse biased saturable absorber and a forward biased amplifying section. To describe the dynamics of this laser we use the traveling wave model taking into account carrier exchange processes between a reservoir and the quantum dots. A comprehensive parameter study is presented and an analysis of mode-locking pulse broadening with an increase of injection current is performed. The results of our theoretical analysis are supported by experimental data demonstrating a strong pulse asymmetry in a monolithic two section quantum dot mode-locked laser.

  • M. Radziunas, K.-H. Hasler, B. Sumpf, T.Q. Tien, H. Wenzel, Mode transitions in DBR semiconductor lasers: Experiments, mode analysis and simulations, Journal of Physics B: Atomic, Molecular and Optical Physics, 44 (2011) pp. 105401/1--105401/8.
    Abstract
    The performance of a multisection DBR semiconductor laser emitting around 1060 nm is experimentally and theoretically investigated. Simulations and mode analysis of the traveling wave model including temperature induced changes of the refractive index explain experimentally observed nearly-periodic transitions between neighboring cavity mode determined continuous wave states with increasing injection current.

  • I. Babushkin, U. Bandelow, A. Vladimirov, Rotational symmetry breaking in small-area circular vertical cavity surface emitting lasers, Optics Communications, 284 (2011) pp. 1299--1302.
    Abstract
    We investigate theoretically the dynamics of three low-order transverse modes in a small-area vertical cavity surface emitting laser. We demonstrate the breaking of axial symmetry of the transverse field distribution in such a device. In particular, we show that if the linewidth enhancement factor is sufficiently large dynamical regimes with broken axial symmetry can exist up to very high diffusion coefficients  10 um^2/ns.

  • J.-E. Kim, M.-R. Dachner, A. Wilms, M. Richter, E. Malic, Microscopic study of relaxation oscillations in quantum-dot VCSELs, Photonics and Nanostructures - Fundamentals and Applications, 9 (2011) pp. 337-344.

  • N. Rebrova, G. Huyet, D. Rachinskii, A.G. Vladimirov, Optically injected mode-locked laser, Phys. Rev. E (3), 83 (2011) pp. 066202/1-066202/8.

  • M. Radziunas, K. Staliunas, Spatial ``rocking'' in broad-area semiconductor lasers, Europhysics Letters, 95 (2011) pp. 14002/1--14002/6.
    Abstract
    The spatial ``rocking'' is a dynamical effect converting a phase-invariant oscillatory system into a phase-bistable one, where the average phase of the system locks to one of two values differing by $pi$. We demonstrate theoretically the spatial rocking in experimentally accessible and practically relevant systems -- the broad area semiconductor lasers. By numerical integration of the laser model equations we show the phase bistability of the optical fields and explore the bistability area in parameter space. We also predict the spatial patterns, such as phase domain walls and phase solitons, which are characteristic for the phase-bistable spatially extended pattern forming systems.

  • V.Z. Tronciu, C. Mirasso, P. Colet, M. Hamacher, M. Benedetti, V. Vercesi, V. Annovazzi-Lodi, Chaos generation and synchronization using an integrated source with an air gap, IEEE J. Quantum Electron., 46 (2010) pp. 1840--1846.

  • V.Z. Tronciu, Chaos communication using semiconductor lasers subject to different kinds of optical feedback, Moldavian Journal of the Physical Sciences, 9 (2010) pp. 50-69.

  • A.G. Vladimirov, U. Bandelow, G. Fiol, D. Arsenijević, M. Kleinert, D. Bimberg, A. Pimenov, D. Rachinskii, Dynamical regimes in a monolithic passively mode-locked quantum dot laser, Journal of the Optical Society of America. B, 27 (2010) pp. 2102-2109.

  • R. Čiegis, M. Radziunas, Effective numerical integration of traveling wave model for edge-emitting broad-area semiconductor lasers and amplifiers, Mathematical Modelling and Analysis. Matematinis Modeliavimis ir Analize. The Baltic Journal on Mathematical Applications, Numerical Analysis and Differential Equations, 15 (2010) pp. 409--430.
    Abstract
    We consider a system of 1+2 dimensional partial differential equations which describes dynamics of edge-emitting broad area semiconductor lasers and amplifiers. The given problem is defined on the unbounded domain. After truncating this domain and defining an auxiliary $1+1$ dimensional linear Schrodinger problem supplemented with different artificial boundary conditions, we propose an effective strategy allowing to get a solution of the full problem with a satisfactory precision in a reasonable time. For further speed up of the numerical integration, we develop a parallel version of the algorithm

  • M.-R. Dachner, E. Malic, M. Richter, A. Carmele, J. Kabuss, A. Wilms, J.-E. Kim, G. Hartmann, J. Wolters, U. Bandelow, A. Knorr, Theory of carrier and photon dynamics in quantum dot light emitters, physica status solidi (b), 247 (2010) pp. 809--828.
    Abstract
    We present a microscopic theory describing the charge carrier and light emission dynamics in quantum dot (QD) light emitters. The theory covers non-classical light emission (fluorescence and Raman emission) in the low carrier injection limit as well as laser emission and pulse amplification in the high carrier injection limit. The theoretical approach is based on QD Bloch equations including microscopically calculated Coulomb and electron-phonon scattering rates between bound QD, continuous wetting layer (WL) and bulk states. In the low carrier density limit, multi-phonon relaxation is the dominant process, while at high charge carrier densities, Coulomb scattering dominates the dynamics. Using an equation of motion approach, we address (i) time-resolved fluorescence and Raman emission, (ii) electrical injection and charge carrier transfer from bulk into WL and QD states, (iii) single photon emission and (iv) gain dynamics of QD amplifiers and lasing dynamics in QD vertical-cavity surface-emitting lasers (VCSELs) at high injection currents.

  • CH. Fiebig, V.Z. Tronciu, M. Lichtner, H. Wenzel, K. Paschke, Experimental and numerical study of distributed Bragg reflector tapered lasers, Applied Physics B: Lasers and Optics, 99 (2010) pp. 209--214.
    Abstract
    We report results on experimental and numerical investigations of the output characteristics of edge-emitting distributed Bragg reflector tapered diode lasers emitting around 980 nm. The experimental results are well described by the Traveling Wave model which is extended by a parametrical heating model. Dynamic instabilities occur due to different thermally induced refractive index changes.

  • G. Fiol, D. Arsenijević, D. Bimberg, A.G. Vladimirov, M. Wolfrum, E.A. Viktorov, P. Mandel, Hybrid mode-locking in a 40 GHz monolithic quantum dot laser, Applied Physics Letters, 96 (2010) pp. 011104/1--011104/3.

  • J.-E. Kim, E. Malic, M. Richter, A. Wilms, A. Knorr, Maxwell--Bloch equation approach for describing the microscopic dynamics of quantum-dot surface-emitting structures, IEEE J. Quantum Electron., 46 (2010) pp. 1115--1126.

  • M. Schulz-Ruhtenberg, I. Babushkin, N.A. Loiko, Th. Ackemann, K. Huang, Polarization properties in the transition from below to above lasing threshold in broad-area vertical-cavity surface-emitting lasers, Physical Review A, 81 (2010) pp. 023819/1--023819/11.
    Abstract
    For highly divergent emission of broad-area vertical-cavity surface-emitting lasers (VCSELs) a rotation of the polarization direction by up to 90 degrees occurs when the pump rate approaches the lasing threshold. Well below threshold the polarization is parallel to the direction of the transverse wave vector and is determined by the transmissive properties of the Bragg reflectors that form the cavity mirrors. In contrast, near-threshold and above-threshold emission is more affected by the reflective properties of the reflectors and is predominantly perpendicular to the direction of transverse wave vectors. Two qualitatively different types of polarization transition are demonstrated: an abrupt transition, where the light polarization vanishes at the point of the transition, and a smooth one, where it is significantly nonzero during the transition.

  • I. Babushkin, Non-Poissonian statistics in an optical analog of quantum billiard with perfectly square boundaries, Physics Letters A, 374 (2010) pp. 896--900.
    Abstract
    We study deviation from the Poissonian statistics of the frequency spacing distribution, appearing due to coupling of polarizational and transverse degrees of freedom in a perfectly square vertical cavity surface emitting laser. The deviation can be controlled by strength of the intracavity anisotropy and its alignment to the device boundaries.

  • M. Wolfrum, S. Yanchuk, A multiple time scale approach to the stability of external cavity modes in the Lang--Kobayashi system using the limit of large delay, SIAM Journal on Applied Dynamical Systems, 9 (2010) pp. 519--535.

  • V.Z. Tronciu, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, Improving the stability of distributed-feedback tapered master-oscillator power-amplifiers, Optical and Quantum Electronics, 41 (2009) pp. 531--537.
    Abstract
    We report theoretical results on the wavelength stabilization in distributed-feedback master-oscillator power-amplifiers which are compact semiconductor laser devices capable of emitting a high brilliance beam at an optical power of several Watts. Based on a traveling wave equation model we calculate emitted optical power and spectral maps in dependence on the pump of the power amplifier. We show that a proper choice of the Bragg grating type and coupling coefficient allows to optimize the laser operation, such that for a wide range of injection currents the laser emits a high intensity continuous wave beam.

  • A.G. Vladimirov, A. Pimenov, D. Rachinskii, Numerical study of dynamical regimes in a monolithic passively mode locked semiconductor laser, IEEE J. Quantum Electron., 45 (2009) pp. 462--468.

  • R. Čiegis, I. Laukaitytė, M. Radziunas, Numerical algorithms for Schrödinger equation with artificial boundary conditions, Numerical Functional Analysis and Optimization. An International Journal, 30 (2009) pp. 903--923.
    Abstract
    We consider a one-dimensional linear Schrödinger problem defined on an infinite domain and approximated by the Crank-Nicolson type finite difference scheme. To solve this problem numerically we restrict the computational domain by introducing the reflective, absorbing or transparent artificial boundary conditions. We investigate the conservativity of the discrete scheme with respect to the mass and energy of the solution. Results of computational experiments are presented and the efficiency of different artificial boundary conditions is discussed.

  • I.V. Ermakov, V.Z. Tronciu, P. Colet, C.R. Mirasso, Controlling the unstable emission of a semiconductor laser subject to conventional optical feedback with a filtered feedback branch, Optics Express, 17 (2009) pp. 8749--8755.

  • A. Jechow, M. Lichtner, R. Menzel, M. Radziunas, D. Skoczowsky, A.G. Vladimirov, Stripe-array diode-laser in an off-axis external cavity: Theory and experiment, Optics Express, 17 (2009) pp. 19599--19604.
    Abstract
    Stripe-array diode lasers naturally operate in an anti-phase supermode. This produces a sharp double lobe far field at angles $pm alpha$ depending on the period of the array. In this paper a 40 emitter gain guided stripe-array laterally coupled by off-axis filtered feedback is investigated experimentally and numerically. We predict theoretically and confirm experimentally that at doubled feedback angle $2 alpha$ a stable higher order supermode exists with twice the number of emitters per array period. The theoretical model is based on time domain traveling wave equations for optical fields coupled to the carrier density equation taking into account diffusion of carriers. Feedback from the external reflector is modeled using Fresnel integration.

  • M. Spreemann, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, Measurement and simulation of distributed-feedback tapered master-oscillator power-amplifiers, IEEE J. Quantum Electron., 45 (2009) pp. 609--616.

  • M. Radziunas, V.Z. Tronciu, U. Bandelow, M. Lichtner, M. Spreemann, H. Wenzel, Mode transitions in distributed-feedback tapered master-oscillator power-amplifier: Theory and experiments, Optical and Quantum Electronics, 40 (2008) pp. 1103-1109.
    Abstract
    Theoretical and experimental investigations have been carried out to study the spectral and spatial behavior of monolithically integrated distributed-feedback tapered master-oscillators power-amplifiers emitting around 973 nm. Introduction of self and cross heating effects and the analysis of longitudinal optical modes allows us to explain experimental results. The results show a good qualitative agreement between measured and calculated characteristics.

  • V.Z. Tronciu, I.V. Ermakov, P. Colet, C.R. Mirasso, Chaotic dynamics of a semiconductor laser with double cavity feedback: Applications to phase shift keying modulation, Optics Communications, 281 (2008) pp. 4747--4752.

  • V.Z. Tronciu, C.R. Mirasso, P. Colet, Chaos-based communications using on-off phase shift keying method, Moldavian Journal of the Physical Sciences, 7 (2008) pp. 343--349.

  • V.Z. Tronciu, C.R. Mirasso, P. Colet, Chaos-based communications using semiconductor lasers subject to feedback from an integrated double cavity, Journal of Physics B: Atomic, Molecular and Optical Physics, 41 (2008) pp. 155401/1--155401/8.

  • S. Yanchuk, K.R. Schneider, O. Lykova, Amplitude synchronization in a system of two coupled semiconductor lasers, Ukrainian Mathematical Journal, 60 (2008) pp. 426-435.

  • R. Čiegis, M. Radziunas, M. Lichtner, Numerical algorithms for simulation of multisection lasers by using traveling wave model, IEEE J. Select. Topics Quantum Electron., 13 (2008) pp. 327-348.

  • M. Radziunas, A. Glitzky, U. Bandelow, M. Wolfrum, U. Troppenz, J. Kreissl, W. Rehbein, Improving the modulation bandwidth in semiconductor lasers by passive feedback, IEEE J. Select. Topics Quantum Electron., 13 (2007) pp. 136--142.

  • O.V. Ushakov, N. Korneyer, M. Radziunas, H.-J. Wünsche, F. Henneberger, Excitability of chaotic transients in a semiconductor laser, Europhysics Letters, 79 (2007) pp. 30004/1--30004/5.

  • E.A. Viktorov, P. Mandel, M. Kuntz, G. Fiol, D. Bimberg, A.G. Vladimirov, M. Wolfrum, Stability of the modelocked regime in quantum dot lasers, Applied Physics Letters, 91 (2007) pp. 231116/1-231116/3.

  • M. Radziunas, Numerical bifurcation analysis of the traveling wave model of multisection semiconductor lasers, Optical and Quantum Electronics, 213 (2006) pp. 98--112.

  • S. Yanchuk, A. Stefanski, T. Kapitaniak, J. Wojewoda, Dynamics of an array of mutually coupled semiconductor lasers, Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, 73 (2006) pp. 016209/1--016209/7.

  • B. Hüttl, H. Kaiser, Ch. Kindel, S. Fidorra, W. Rehbein, H. Stolpe, G. Sahin, U. Bandelow, M. Radziunas, A. Vladimirov, H. Heidrich, Experimental investigations on the suppression of Q-switching in monolithic 40 GHz mode-locked semiconductor lasers, Applied Physics Letters, 88 (2006) pp. 221104/1--221104/3.

  • M. Nizette, D. Rachinskii, A. Vladimirov, M. Wolfrum, Pulse interaction via gain and loss dynamics in passive mode-locking, Physica D. Nonlinear Phenomena, 218 (2006) pp. 95--104.

  • T. Perez, M. Radziunas, H.-J. Wünsche, C.R. Mirasso, F. Henneberger, Synchronization properties of two coupled multisection semiconductor lasers emitting chaotic light, IEEE Phot. Tech. Letter, 18 (2006) pp. 2135-2137.

  • D.I. Rachinskii, A. Vladimirov, U. Bandelow, B. Hüttl, R. Kaiser, Q-switching instability in a mode-locked semiconductor laser, Journal of the Optical Society of America. B, 23 (2006) pp. 663--670.

  • V.Z. Tronciu, H.-J. Wünsche, M. Wolfrum, M. Radziunas, Semiconductor laser under resonant feedback from a Fabry--Perot resonator: Stability of continuous-wave operation, Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, 73 (2006) pp. 046205/1--046205/7.

  • E. Viktorov, P. Mandel, A. Vladimirov, U. Bandelow, A model for mode-locking in quantum dot lasers, Applied Physics Letters, 88 (2006) pp. 201102/1--201102/3.

  • U. Bandelow, M. Radziunas, A. Vladimirov, B. Hüttl, R. Kaiser, 40 GHz Mode-locked semiconductor lasers: Theory, simulations and experiment, Optical and Quantum Electronics, 38 (2006) pp. 495--512.

  • TH. Koprucki, M. Baro, U. Bandelow, Th. Tien, F. Weik, J.W. Tomm, M. Grau, M.-Ch. Amann, Electronic structure and optoelectronic properties of strained InAsSb/GaSb multiple quantum wells, Applied Physics Letters, 87 (2005) pp. 181911/1--181911/3.

  • A. Vladimirov, D. Turaev, Model for passive mode locking in semiconductor lasers, Physical Review A, 72 (2005) pp. 033808/1-033808/13.

  • S. Yanchuk, Properties of stationary states of delay equations with large delay and applications to laser dynamics, Mathematical Methods in the Applied Sciences, 28 (2005) pp. 363--377.

  • A.G. Vladimirov, D.V. Turaev, G. Kozyreff, Delay differential equations for mode-locked semiconductor lasers, , 29 (2004) pp. 1221--1223.

  • A.G. Vladimirov, D.V. Turaev, A new model for a mode-locked semiconductor laser, Radiophysics and Quantum Electronics, 47 (2004) pp. 769--776.

  • S. Bauer, J. Kreissl, M. Radziunas, H.-J. Wünsche, F. Henneberger, J. Sieber, M. Sartorius, O. Brox, Nonlinear dynamics of semiconductor lasers with active optical feedback, Phys. Rev. E (3), 69 (2004) pp. 016206/1--016206/10.

  • J. Sieber, M. Radziunas, K.R. Schneider, Dynamics of multisection semiconductor lasers, Mathematical Modelling and Analysis. Matematinis Modeliavimis ir Analize. The Baltic Journal on Mathematical Applications, Numerical Analysis and Differential Equations, 9 (2004) pp. 51--66.

  • J. Sieber, L. Recke, K.R. Schneider, Dynamics of multisection semiconductor lasers, Journal of Mathematical Sciences (New York), 124 (2004) pp. 5298--5309.

  • K.R. Schneider, S. Yanchuk, L. Recke, Dynamics of two mutually coupled semiconductor lasers: Instantaneous coupling limit, Phys. Rev. E (3), 69 (2004) pp. 056221/1--056221/12.

  • V. Tronciu, Investigation of self-pulsation and excitability of tandem blue lasers, AIUB Journal of Science and Engineering, 3 (2004) pp. 7--10.

  • O. Brox, S. Bauer, M. Radziunas, M. Wolfrum, J. Sieber, J. Kreissl, B. Sartorius, H.-J. Wünsche, High-frequency pulsations in DFB-lasers with amplified feedback, Numerical Functional Analysis and Optimization. An International Journal, 39 (2003) pp. 1381--1387.

  • B. Krauskopf, K.R. Schneider, J. Sieber, S. Wieczorek, M. Wolfrum, Excitability and self-pulsations near homoclinic bifurcations in semiconductor laser systems, IEEE J. Quantum Electron., 215 (2003) pp. 367--379.

  • H.-J. Wünsche, M. Radziunas, S. Bauer, O. Brox, B. Sartorius, Simulation of phase-controlled mode-beating lasers, IEEE J. Select. Topics Quantum Electron., 9 (2003) pp. 857--864.

  • U. Bandelow, R. Hünlich, Th. Koprucki, Simulation of static and dynamic properties of edge-emitting multiple-quantum-well lasers, IEEE J. Select. Topics Quantum Electron., 9 (2003) pp. 798--806.

  • A.G. Vladimirov, G. Kozyreff, P. Mandel, Synchronization of weakly stable oscillators and semiconductor laser arrays, Europhysics Letters, 61 (2003) pp. 613--619.

  • A.G. Vladimirov, G. Kozyreff, P. Mandel, Synchronization of weakly stable oscillators and semiconductor laser arrays, Europhysics Letters, 61 (2003) pp. 613--619.

  • H.-J. Wünsche, O. Brox, M. Radziunas, F. Henneberger, Excitability of a semiconductor laser by a two-mode homoclinic bifurcation, Physical Review Letters, 88 (2002) pp. 023901/1--023901/4.

  • D. Turaev, M. Wolfrum, Instabilities of lasers with moderately delayed optical feedback, IEEE J. Quantum Electron., 213 (2002) pp. 127--138.

  • U. Bandelow, M. Radziunas, J. Sieber, M. Wolfrum, Impact of gain dispersion on the spatio-temporal dynamics of multisection lasers, IEEE J. Quantum Electron., 37 (2001) pp. 183--188.

  • M. Möhrle, B. Sartorius, C. Bornholdt, S. Bauer, O. Brox, A. Sigmund, R. Steingräber, M. Radziunas, H.-J. Wünsche, Detuned grating multi-section-RW-DFB lasers for high speed optical signal processing, IEEE J. Select. Topics Quantum Electron., 7 (2001) pp. 217--223.

  • V. Tronciu, H.-J. Wünsche, J. Sieber, K.R. Schneider, Dynamics of single mode semiconductor lasers with passive dispersive reflectors, , 182 (2000) pp. 221--228.

  • M. Radziunas, H.-J. Wünsche, B. Sartorius, O. Brox, D. Hoffmann, K.R. Schneider, D. Marcenac, Modeling self-pulsating DFB-lasers with an integrated phase tuning section, IEEE J. Quantum Electron., 36 (2000) pp. 1026--1034.

  Contributions to Collected Editions

  • M. Kantner, U. Bandelow, Th. Koprucki, H.-J. Wünsche, Modeling and simulation of injection dynamics for quantum dot based single-photon sources, in: Proceedings of the 16th International Conference on Numerical Simulation of Optoelectronic Devices, J. Piprek, Ch. Poulton, M. Steel, M. DE Sterke, eds., IEEE Conference Publications Management Group, Piscataway, 2016, pp. 219--220.
    Abstract
    Single semiconductor quantum dots embedded in p-i-n diodes have been demonstrated to operate as electrically driven single-photon sources. By means of numerical simulations one can explore the limitations in the carrier injection dynamics and further improve the device technology. We propose a comprehensive modeling approach coupling the macroscopic transport of bulk carriers with an open quantum system to describe the essential physics of such devices on multiple scales.

  • M. Kantner, U. Bandelow, Th. Koprucki, J.-H. Schulze, A. Strittmatter, H.-J. Wünsche, On current injection into single quantum dots through oxide-confined PN-diodes, in: Proceedings of the 16th International Conference on Numerical Simulation of Optoelectronic Devices, J. Piprek, Ch. Poulton, M. Steel, M. DE Sterke, eds., IEEE Conference Publications Management Group, Piscataway, 2016, pp. 215--216.
    Abstract
    Current injection into single quantum dots embedded in vertical pn-diodes featuring oxide apertures is essential to the technological realization of single-photon sources. This requires efficient electrical pumping of sub-micron sized regions under pulsed excitation to achieve control of the carrier population of the desired quantum dots. We show experimentl and theoretical evidence for a rapid lateral spreading of the carriers after passing the ocide aperture in the conventional p-i-n-design in the low-injection regime suitable for single-photon emitters. By an alternative design employing p-doping up to the oxide aperture the current spreading can be suppressed resulting in an enhanced current confinement and increased injection efficiencies.

  • W.W. Ahmed, S. Kumar, R. Herrero, M. Botey, M. Radziunas, K. Staliunas, Suppression of modulation instability in pump modulated flat-mirror VECSELs, in: Nonlinear Optics and its Applications IV, B.J. Eggleton, N.G.R. Broderick, A.L. Gaeta, eds., 9894 of Proceedings of SPIE, SPIE Digital Library, 2016, pp. 989406/1--989406/7.
    Abstract
    We show that modulation instability (MI) can be suppressed in vertical external cavity surface emitting lasers (VECSELs) by introducing a periodic spatio-temporal modulation of the pump profile which in turn allows a simple flat-mirror configuration. The stability analysis of such pump modulated flat-mirror VECSELs is performed by a modified Floquet method and results are confirmed by full numerical integration of the model equations. It is found that the amplitude of the modulation as well as its spatial and temporal frequencies are crucial parameters for high spatial beam quality emission. We identify regions of complete and partial stabilization in parameter space for VECSELs with different external cavity lengths. The proposed method is shown to efficiently stabilize VECSELs with cavity lengths ranging from millimetres up to centimetres. However, the applicability of this method becomes limited for micro-meter-long cavities due to strong intrinsic relaxation oscillations.

  • TH. Butler, D. Goulding, S. Slepneva, B. O'Shaughnessy, B. Kelleher, S.P. Hegarty, H.Ch. Lyu, K. Karnowski, M. Wojtkowski, A.G. Vladimirov, G. Huyet, Coherence properties of fast frequency swept lasers revealed via full electric field reconstruction, in: Physics and Simulation of Optoelectronic Devices XXIV, B. Witzigmann, M. Osiński, Y. Arakawa, eds., 9742, Proceedings of SPIE, Bellingham, Washington, 2016, pp. 97420K/1--97420K/7.
    Abstract
    A novel, time-resolved interferometric technique is presented allowing the reconstruction of the complex electric field output of a fast frequency swept laser in a single-shot measurement. The power of the technique is demonstrated by examining a short cavity swept source designed for optical coherence tomography applications, with a spectral bandwidth of 18 THz. This novel analysis of the complete electric field reveals the modal structure and modal evolution of the device as well as providing a time-resolved real-time characterization of the optical spectrum, linewidth and coherence properties of a dynamic rapidly swept laser.

  • S. Kumar, W. Ahmed, R. Herrero, M. Botey, M. Radziunas, K. Staliunas, Stabilization of broad area semiconductor amplifiers by spatially modulated potentials, in: Nonlinear Dynamics: Materials, Theory and Experiments, M. Tlidi, M. Clerc, eds., 173 of Springer Proceedings in Physics, Springer International Publishing Switzerland, Cham, 2016, pp. 139--151.
    Abstract
    We propose the stabilization of the output beam of Broad Area Semiconductor (BAS) amplifiers through the introduction of a spatially periodic modulated potential. We show that a periodic modulation of the pump profile in transverse and longitudinal directions, under certain ?resonance? condition, can solve two serious problems of BAS amplifiers (and possibly lasers), which are (i) the lack of an intrinsic spatial mode selection mechanism in linear amplification regimes and (ii) the modulation instability (also called Bespalov-Talanov instability) in nonlinear regimes. The elimination of these two drawbacks can significantly improve the spatial quality of the emitted beam in BAS amplifiers.

  • D. Turaev, A.G. Vladimirov, S. Zelik, Interaction of spatial and temporal cavity solitons in mode-locked lasers and passive cavities, in: Laser Optics (LO), 2016 International Conference, IEEE, New York, 2016, pp. 37628.
    Abstract
    We study interaction of well-separated localized structures of light in the presence of periodic perturbations. Oscillating localized structures were found to emit weakly decaying dispersive waves leading to a strong enhancement of the interaction and formation of new types of bound states. We discuss the applicability of our analytical results to the interpretation of experimental and numerical data reported earlier.

  • M. Radziunas, A multi-mode delay differential equation model for lasers with optical feedback, in: Proceedings of the 16th International Conference on Numerical Simulation of Optoelectronic Devices, J. Piprek, Ch. Poulton, M. Steel, M. DE Sterke, eds., IEEE Conference Publications Management Group, Piscataway, 2016, pp. 13--14.
    Abstract
    In this work, we introduce a new multi-mode (MM) delay differential equation (DDE) model suited for simulations of the Fabry-Perot type diode laser with an optical feedback from the external cavity (EC).

  • M. Radziunas, Modeling and simulations of edge-emitting broad-area semiconductor lasers and amplifiers, in: Parallel Processing and Applied Mathematics -- 11th International Conference, PPAM 2015 Krakow, Poland, September 6--9, 2015, Revised Selected Papers, Part II, R. Wyrzykowski, E. Deelman, J. Dongarra, K. Karczewski, J. Kitowski, K. Wiatr, eds., 9574 of Lecture Notes in Computer Science, Springer International Publishing AG Switzerland, Cham, 2016, pp. 269--276.
    Abstract
    A (2+1)-dimensional partial differential equation model describing spatial-lateral dynamics of edge-emitting broad-area semiconductor devices is considered. A numerical scheme based on a split-step Fourier method is implemented on a parallel computing cluster. Numerical integration of the model equations is used for optimizing of existing devices with respect to the emitted beam quality, as well as for creating and testing of novel device design concepts.

  • A.G. Vladimirov, G. Huyet, A. Pimenov, Delay differential models in multimode laser dynamics: Taking chromatic dispersion into account, in: Semiconductor Lasers and Laser Dynamics VII, 9892 of Proceedings of SPIE, SPIE, Bellingham, Washington, 2016, pp. 98920I/1--98920I/7.
    Abstract
    A set of differential equations with distributed delay is derived for modeling of multimode ring lasers with intracavity chromatic dispersion. Analytical stability analysis of continuous wave regimes is performed and it is demonstrated that sufficiently strong anomalous dispersion can destabilize these regimes. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

  • M. Kantner, U. Bandelow, Th. Koprucki, Multi-scale modeling and simulation of single-photon sources, in: Proceedings of iNOW 2015 (International Nano-Optoelectronics Workshop) (PDF only), Y. Arakawa, F. Koyama, C. Chang-Hasnain, D. Bimberg, eds., pp. 129-130.

  • S. Kumar, W. Ahmed, M. Radziunas, M. Botey, R. Herrero, K. Staliunas, Taming the modulation instability in semiconductor lasers, in: Transparent Optical Networks (ICTON), 2015 17th International Conference on, Budapest, M. Jaworski, M. Marciniak, eds., IEEE, New York, 2015, pp. 1--4.
    Abstract
    Semiconductor lasers are efficient light sources with an important drawback, the lack of an intrinsic mode selection mechanism which leads to spatio-temporal instabilities. The modulation instability that unstabilizes the homogeneous solution can be suppressed by the introduction of spatial modulations in the transverse and longitudinal directions. The present work applies this stabilization technique to two of the most popular semiconductor devices, the Broad Area Semiconductor (BAS) amplifier and the Vertical-Cavity Surface-Emitting Laser (VCSEL).

  • V.Z. Tronciu, M. Radziunas, H. Wenzel, Stationary states of external cavity diode laser, in: Proceedings of the 5th International Conference on Telecommunications, Electronics and Informatics (ICTEI 2015), V. Kantser, S. Andronic, eds., Technical University of Moldova, Chisinau, pp. 58--59.

  • M. Radziunas, R. Herrero, M. Botey, K. Staliunas, Beam shaping in spatially modulated broad area edge-emitting semiconductor lasers, in: 2015 European Conference on Lasers and Electro-Optics -- European Quantum Electronics Conference, Optical Society of America, 2015, paper CB_P_3, 2015, pp. 1--1.

  • M. Radziunas, V. Tronciu, E. Luvsandamdin, Ch. Kürbis, A. Wicht, H. Wenzel, Coexistence of multiple stable continuous-wave states in micro-integrated external-cavity diode lasers, in: 2015 European Conference on Lasers and Electro-Optics -- European Quantum Electronics Conference, Optical Society of America, 2015, paper CB_P_28, 2015, pp. 1--1.

  • M. Radziunas, Nonlinear dynamics in mode locked lasers: Modeling, simulations and analysis, in: Proceedings of the 5th International Conference on Telecommunications, Electronics and Informatics (ICTEI 2015), V. Kantser, S. Andronic, eds., Technical University of Moldova, Chisinau, 2015, pp. 94--97.

  • R.M. Arkhipov, M. Radziunas, A.G. Vladimirov, Theoretical analysis of the influence of external periodic forcing on nonlinear dynamics of passively mode-locked semiconductor lasers, in: Proceedings of the XIV School Seminar Wave Phenomena in Inhomogeneous Media (Waves 2014), Section 9, Nonlinear dynamics and information systems (in electronic form and in Russian), 2014, pp. 3--6.

  • R.M. Arkhipov, M.V. Arkhipov, Mode-locking in two section and single section lasers due to coherent interaction of light and matter in the gain and absorbing media, in: Proceedings of the XIV School Seminar Wave Phenomena in Inhomogeneous Media (Waves 2014), Section 3, Nonlinear and coherent optics (in electronic form and in Russian), 2014, pp. 43--45.

  • M. Kantner, Th. Koprucki, H.-J. Wünsche, Numerical simulation and optimization of electrical resistance in distributed Bragg reflectors, in: iNOW2014 -- International Nano-Optoelectronics Workshop, Luga and St. Petersburg, Russia, August 10--22, 2014, C. Chang-Hasnain, Z.I. Alferov, V.G. Dubrovskii, eds., Polytechnical University St. Petersburg, 2014, pp. 89--90.

  • M. Radziunas, R. Ciegis, Modeling and simulations of beam stabilization in edge-emitting broad area semiconductor devices, in: Parallel Processing and Applied Mathematics -- 10th International Conference, PPAM 2013, Warsaw, Poland, September 8--11, 2013, Revised Selected Papers, Part II, R. Wyrzykowski, J. Dongarra, K. Karczewski, J. Waśniewski, eds., LNCS 8385, Springer, Heidelberg, 2014, pp. 332--342.
    Abstract
    A 2+1 dimensional PDE traveling wave model describing spatial-lateral dynamics of edge-emitting broad area semiconductor devices is considered. A numerical scheme based on a split-step Fourier method is presented and implemented on a parallel compute cluster. Simulations of the model equations are used for optimizing of existing devices with respect to the emitted beam quality, as well as for creating and testing of novel device design concepts.

  • M. Radziunas, R. Herrero, M. Botey, K. Staliunas, Simulations and analysis of beam quality improvement in spatially modulated broad area edge-emitting devices, in: Proc. SPIE 9134, Semiconductor Lasers and Laser Dynamics VI, Brussels, Belgium, April 14, 2014, K. Panajatov, M. Sciamanna, A. Valle, R. Michalzik, eds., 2014, pp. 91340Q/1--91340Q/8.
    Abstract
    We simulate and analyze how beam quality improves while being amplified in edge emitting broad area semiconductor amplifiers with a periodic structuring of the electrical contacts, in both longitudinal and lateral directions. A spatio-temporal traveling wave model is used for simulations of the dynamics and nonlinear interactions of the optical fields, induced polarizations and carrier density. In the case of small beam amplification, the optical field can be expanded into few Bloch modes, so that the system is described by a set of ODEs for the evolution of the mode amplitudes. The analysis of such model provides a deep understanding of the impact of the different parameters on amplification and on spatial (angular) filtering of the beam. It is shown that under realistic parameters the twodimensional modulation of the current can lead not only to a significant reduction of the emission divergence, but also to an additional amplification of the emitted field.

  • R. Herrero, S. Kumar, M. Radziunas, M. Botey, K. Staliunas, Improving beam quality in broad area semiconductor amplifiers (in electronic form), in: Transparent Optical Networks (ICTON), 2014 16th International Conference on, IEEE Conference Publications, Institute of Electrical and Electronics Engineers, 2014, pp. 45--47.

  • V.Z. Tronciu, M. Radziunas, E. Luvsandamdin, Ch. Kürbis, A. Wicht, H. Wenzel, Simulations and experiments of external cavity diode lasers, in: 7th International Conference on Materials Science and Condensed Matters Physics. Abstracts. Chisinau, Moldova, September 16--19, 2014, 2014, pp. p. 47.

  • A. Glitzky, A. Mielke, L. Recke, M. Wolfrum, S. Yanchuk, D2 -- Mathematics for optoelectronic devices, in: MATHEON -- Mathematics for Key Technologies, M. Grötschel, D. Hömberg, J. Sprekels, V. Mehrmann ET AL., eds., 1 of EMS Series in Industrial and Applied Mathematics, European Mathematical Society Publishing House, Zurich, 2014, pp. 243--256.

  • U. Bandelow, Th. Koprucki, H.-J. Wünsche, Dynamics of classical optical fields in semiconductor lasers, in: iNOW2014 -- International Nano-Optoelectronics Workshop, Luga and St. Petersburg, Russia, August 10--22, 2014, C. Chang-Hasnain, Z.I. Alferov, V.G. Dubrovskii, eds., Polytechnical University St. Petersburg, 2014, pp. 14--15.

  • M. Radziunas, V.Z. Tronciu, E. Luvsandamdin, C. Kürbis, A. Wicht, H. Wenzel, Investigations of external cavity diode lasers: Simulations, analysis and experiments, in: Proceedings of the 14th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2014, 1--4 September 2014, J. Piprek, J. Javaloyes, eds., IEEE Conference Publications Management Group, Piscataway, NJ, USA, 2014, pp. 149--150.

  • M. Radziunas, Longitudinal mode analysis of multisection ring and edge-emitting semiconductor lasers, in: Proceedings of the 14th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2014, 1--4 September 2014, J. Piprek, J. Javaloyes, eds., IEEE Conference Publications Management Group, Piscataway, NJ, USA, 2014, pp. 133--134.

  • M. Radziunas, Simulations and analysis of beam shaping in spatially modulated broad area edge-emitting devices, in: Proceedings of 24th IEEE International Semiconductor Laser Conference (ISLC 2014), Palma de Mallorca, Spain, Sept. 7--10, 2014, 2014, pp. 19--20.

  • S. Amiranashvili, U. Bandelow, N. Akhmediev, Ultrashort optical solitons in nonlinear media with arbitrary dispersion, in: Proceedings of the 13th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2013, 19--22 August 2013, J. Piprek, L. Chrostowski, eds., IEEE Conference Publications Management Group, Piscataway, NJ, USA, 2013, pp. 117--118.

  • R.M. Arkhipov, M. Radziunas, A.G. Vladimirov, Numerical simulations of the influence of injection of biharmonic radiation on the regime of passive mode-locking in semiconductor laser, in: Proceedings of the XIVth All-Russian Scientific School-Seminar ``Physics and Microwave Application'' (Waves-2013), Moscow, May 20--26, 2013, Section 5: Nonlinear Dynamics and Information Systems (electronic, in Russian), 2013, pp. 9--12.

  • R.M. Arkhipov, A. Pimenov, M. Radziunas, A.G. Vladimirov, Theoretical analysis of hybrid and dual mode injected semiconductor mode-locked lasers, in: Proceedings of the 2013 International Nano-Optoelectronics Workshop (iNOW2013), Cargèse, France, August 18--30, 2013, pp. B3--B4.

  • M. Radziunas, R. Herrero, M. Botey, K. Staliunas, Theoretical study of beam quality improvement in spatially modulated broad area edge-emitting devices, in: CLEO/Europe -- IQEC 2013 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2013), paper CB-P.38 MON, 2013, pp. 1--1.

  • M. Radziunas, Traveling wave modelling and mode analysis of semiconductor ring lasers, in: CLEO/Europe -- IQEC 2013 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2013), paper CB-P.37 MON, 2013, pp. 1--1.

  • B. Slepneva, B. O'Shaughnessy, S. Kelleher, A. Hegarty, A.G. Vladimirov, G. Huyet, Dynamics of Fourier domain mode locked lasers, in: Proceedings of CLEO: Applications and Technology, San Jose, California, United States, June 9--14, 2013, paper JW2A.87, Optical Society of America, 2013.

  • M.V. Arkhipov, R.M. Arkhipov, S.N. Bagaev, V.S. Egorov, I.A. Chekhonin, M.A. Chekhonin, Ultrafast laser beam scanning by resonant light-induced spacial periodic structures, in: Proceedings of the XIVth All-Russian Scientific School-Seminar ``Physics and Microwave Application'' (Waves-2013), Moscow, May 20--26, 2013, Section 6: Coherent and Nonlinear Optics (electronic, in Russian), 2013, pp. 6--9.

  • R. Herrero, M. Botey, M. Radziunas, K. Staliunas, Beam shaping in spatially modulated broad area semiconductor amplifiers, in: CLEO/Europe -- IQEC 2013 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2013), paper IG-2.4 WED, 2013, pp. 1--1.

  • U. Bandelow, Th. Koprucki, K. Gärtner, A. Wilms, A. Mielke, Comprehensive mathematical modeling and simulation of semiconductor lasers, in: Proceedings of the 2013 International Nano-Optoelectronics Workshop (iNOW2013), Cargèse, France, August 18--30, 2013, pp. A7--A8.

  • U. Bandelow, N. Akhmediv, Solitons on a background, rogue waves, and classical soliton solutions of the Sasa--Satsuma equation, in: Laser Dynamics and Nonlinear Photonics, 2013 Sixth ``Rio De La Plata'' Workshop on, C. Masoller, I. Brener, eds., IEEE, 2013, pp. 1--2.

  • A. Pimenov, G. Kozyreff, V.Z. Tronciu, A.G. Vladimirov, Theoretical analysis of a multi-stripe laser array with external off-axis feedback, in: Semiconductor Lasers and Laser Dynamics V, K. Panajotov, M. Sciamanna, A. Valle, R. Michalzik, eds., 8432 of Proceedings of SPIE, SPIE, Bellingham, Washington, 2012, pp. 843212/1--843212/10.

  • M. Radziunas, K. Staliunas, Spatial ``rocking'' for improving the spatial quality of the beam of broad area semiconductor lasers, in: Semiconductor Lasers and Laser Dynamics V, K. Panajotov, M. Sciamanna, A.A. Valle, R. Michalzik, eds., 8432 of Proceedings of SPIE, SPIE, Bellingham, Washington, 2012, pp. 84320Q/1--84320Q/9.

  • E. Averlant, M. Tlidi, A.G. Vladimirov, H. Thienpont, K. Panajotov, Delay induces motion of multipeak localized structures in cavity semiconductors, in: Semiconductor Lasers and Laser Dynamics V, K. Panajotov, M. Sciamanna, A. Valle, R. Michalzik, eds., 8432 of Proceedings of SPIE, SPIE, Bellingham, Washington, 2012, pp. 84321D/1--84321D/6.

  • C. Brée, S. Amiranashvili, U. Bandelow, Spatio-temporal pulse propagation in nonlinear dispersive optical media, in: Proceedings of the 12th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD'12, J. Piprek, W. Lu, eds., IEEE Conference Publications Management Group, New Jersey, USA, 2012, pp. 131--132.

  • A.G. Vladimirov, D. Rachinskii, M. Wolfrum, Modeling of passively mode-locked semiconductor lasers, in: Nonlinear Laser Dynamics: From Quantum Dots to Cryptography, K. Lüdge, ed., Reviews in Nonlinear Dynamics and Complexity, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2012, pp. 183--216.

  • M. Radziunas, A.G. Vladimirov, E.A. Viktorov, G. Fiol, H. Schmeckebier, D. Bimberg, Strong asymmetry of mode-locking pulses in quantum-dot semiconductor lasers, in: CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CB3_5, pp. 1--1.

  • M. Radziunas, K. Staliunas, Spatial ``rocking'' in broad emission area semiconductor lasers, in: CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CB5_2, pp. 1--1.

  • A. Rusu, C. Pirtac, S. Rusu, V.Z. Tronciu, On/Off phase shift keying encryption method of semiconductor lasers with an air gap (in Romanian), in: Proceeding of the 7th International Conference on Microelectronics and Computer Science, Chisinau, September 22--24, 2011, Moldova, V. Kanter, I. Balmus, eds., 1, Technical University of Moldova, 2011, pp. 402-403.

  • A. Rusu, C. Pirtac, S. Rusu, V.Z. Tronciu, Verification of Steiner's theorem with physical pendulum --- Computer assisted laboratory work (in Romanian), in: Proceeding of the 7th International Conference on Microelectronics and Computer Science, Chisinau, September 22--24, 2011, Moldova, V. Kanter, I. Balmus, eds., 1, Technical University of Moldova, 2011, pp. 404-405.

  • C. Brée, A. Demircan, G. Steinmeyer, Saturation of the all-optical Kerr effect, in: CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper EF4_6, pp. 1-1.

  • V.Z. Tronciu, S.S. Rusu, A.S. Rusu, On/Off phase shift keying encryption method of semiconductor lasers with an air gap, in: Proceeding of the 7th International Conference on Microelectronics and Computer Science, Chisinau, September 22--24, 2011, Moldova, V. Kanter, I. Balmus, eds., 1, Technical University of Moldova, 2011, pp. 29-32.

  • V.Z. Tronciu, On the dynamics of multimode semiconductor lasers, in: Proceeding of the 7th International Conference on Microelectronics and Computer Science, Chisinau, September 22--24, 2011, Moldova, V. Kanter, I. Balmus, eds., 1, Technical University of Moldova, 2011, pp. 27--28.

  • M. Radziunas, A.G. Vladimirov, E.A. Viktorov, Traveling wave modeling, simulation and analysis of quantum-dot mode-locked semiconductor lasers, in: Semiconductor Lasers and Laser Dynamics IV, K. Panajotov, M. Sciamanna, A.A. Valle, R. Michalzik, eds., 7720 of Proceedings of SPIE, SPIE, 2010, pp. 77200X/1--77200X/8.

  • V.Z. Tronciu, C. Fiebig, M. Lichtner, H. Wenzel, Numerical and experimental investigations of DBR tapered lasers, in: Proceedings of the 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), V. Kantser, S. Andronic, eds., 1, Technical University of Moldova, Chisinau, 2010, pp. 73--76.

  • V.Z. Tronciu, S.S. Rusu, C. Pîrtac, Dynamics of coupled semiconductor lasers. On/off phase shift keying encryption method, in: Proceedings of the 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), V. Kantser, S. Andronic, eds., 1, Technical University of Moldova, Chisinau, 2010, pp. 77--80.

  • V.Z. Tronciu, Semiconductor laser a key element for new generation optoelectronic systems, in: Proceedings of the 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), V. Kantser, S. Andronic, eds., 1, Technical University of Moldova, Chisinau, 2010, pp. 67--72.

  • I.V. Ermakov, G. Van DER Sande, L. Gelens, A. Scire, P. Colet, C.R. Mirasso, V.Z. Tronciu, J. Danckaert, Numerical investigation of nonlinear dynamics of semiconductor ring lasers with two external cavities, in: Proceedings of the Young Optical Scientists Conference, YOSC-2009, V. Karassik, ed., Bauman Moscow State Technical University Press, 2010, pp. 106--109.

  • A. Jechow, D. Skoczowsky, M. Lichtner, M. Radziunas, R. Menzel, High-brightness emission from stripe-array broad area diode lasers operated in off-axis external cavities, in: High-Power Diode Laser Technology and Applications VIII, M.S. Zediker, ed., 7583 of Proceedings of SPIE, SPIE, 2010, pp. 758312/1--758312/11.

  • A.G. Vladimirov, M. Wolfrum, G. Fiol, D. Arsenijević, D. Bimberg, E. Viktorov, P. Mandel, D. Rachinskii, Locking characteristics of a 40-GHz hybrid mode-locked monolithic quantum dot laser, in: Semiconductor Lasers and Laser Dynamics IV, K. Panajotov, M. Sciamanna, A.A. Valle, R. Michalzik, eds., 7720 of Proceedings of SPIE, SPIE, 2010, pp. 77200Y/1--77200Y/8.

  • M. Radziunas, A.G. Vladimirov, E. Viktorov, Traveling wave modeling of mode-locked quantum dot semiconductor lasers, in: CLEO/Europe and EQEC 2009 Conference Digest (Optical Society of America, 2009), oral presentation CB4.4 TUE, 2009, pp. 1--1.

  • M. Radziunas, Simulation of switching between stable unidirectional states in semiconductor ring lasers, in: CLEO/Europe and EQEC 2009 Conference Digest (Optical Society of America, 2009), poster CB.P.12 TUE, 2009, pp. 1--1.

  • V.Z. Tronciu, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, Calculation of improved features of distributed-feedback tapered master-oscillator power-amplifiers, in: CLEO/Europe and EQEC 2009 Conference Digest (Optical Society of America, 2009), poster CB.P.30 TUE, 2009, pp. 1--1.

  • V.Z. Tronciu, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, Dynamics and stability improvement of DFB tapered master-oscillator power-amplifiers, in: Proceedings of the 6th International Conference on Microelectronics and Computer Science, Chisinau, Moldova, October 1--3, 2009, I.M. Tiginyanu, I. Balmus, eds., Technical University of Moldova, Chisinau, 2009, pp. 15-18.

  • V.Z. Tronciu, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, Improving the stability of distributed-feedback tapered master-oscillator power-amplifiers, in: Proceedings of the 9th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD'09, J. Piprek, Y.-T. Lee, eds., IEEE/LEOS, 2009, pp. 55-56.

  • M. Schulz-Ruhtenberg, I. Babushkin, N.A. Loiko, K.F. Huang, T. Ackemann, Analysis of polarization states of broad-area vertical-cavity surface-emitting lasers below and above threshold, in: 2009 IEEE/LEOS Winter Topicals Meeting Series (WTM 2009), IEEE, 2009, pp. 178-179.

  • E.V. Viktorov, P. Mandel, A.G. Vladimirov, M. Wolfrum, G. Fiol, M. Kuntz, D. Bimberg, Hybrid mode-locking in a 40 GHz monolithic quantum dot laser, in: CLEO/Europe and EQEC 2009 Conference Digest (Optical Society of America, 2009), oral presentation CB4.2 TUE, 2009, pp. 1--1.

  • M. Radziunas, Travelling wave modeling of semiconductor ring lasers, in: Semiconductor Lasers and Laser Dynamics III, K.P. Panajotov, M. Sciamanna, A.A. Valle, R. Michalzik, eds., 6997 of Proceedings of SPIE, SPIE, 2008, pp. 69971B/1--69971B/9.

  • M. Lichtner, M. Radziunas, U. Bandelow, M. Spreemann, H. Wenzel, Dynamic simulation of high brightness semiconductor lasers, in: Proceedings of the 8th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD'08, J. Piprek, E. Larkins, eds., IEEE/LEOS, 2008, pp. 65--66.

  • M. Radziunas, U. Troppenz, J. Kreissl, Tailoring single-mode DFB laser with integrated passive feedback section for direct modulation applications, in: Proceedings of the European Conference on Lasers and Electro-Optics, 2007, and the International Quantum Electronics Conference. CLEO/IQEC 2007 (oral presentation CB-35-WED), IEEE, 2007, pp. 1--1.

  • J. Kreissl, U. Troppenz, W. Rehbein, T. Gärtner, P. Harde, M. Radziunas, 40 Gbit/s directly modulated passive feedback laser with complex-coupled DFB section, in: Proceedings of ECOC 2007, VDE Verlag GmbH, Berlin/Offenbach, 2007, pp. 213--214.

  • T. Perez, C. Mirasso, H.-J. Wünsche, F. Henneberger, M. Radziunas, I. Fischer, Synchronization of chaotic unidirectionally coupled multisection lasers, in: Proceedings of the European Conference on Lasers and Electro-Optics, 2007, and the International Quantum Electronics Conference. CLEO/IQEC 2007 (oral presentation JSI3-2-THU), IEEE, 2007, pp. 1-1.

  • L. Recke, M. Wolfrum, S. Yanchuk, Dynamics of coupled semiconductor lasers, in: Analysis and Control of Complex Nonlinear Processes in Physics, Chemistry and Biology, Chapter 6, L. Schimansky-Geier, B. Fiedler, J. Kurths, E. Schöll, eds., World Scientific, New Jersey [et al.], 2007, pp. 185--212.

  • O.V. Ushakov, H.-J. Wünsche, F. Henneberger, M. Radziunas, Excitability of chaotic transients in a semiconductor laser, in: Proceedings of the European Conference on Lasers and Electro-Optics, 2007, and the International Quantum Electronics Conference. CLEO/IQEC 2007 (oral presentation IG6-2-THU), IEEE, 2007, pp. 1--1.

  • E.A. Viktorov, P. Mandel, M. Kuntz, G. Fiol, D. Bimberg, A.G. Vladimirov, M. Wolfrum, Stability of the modelocking regime in quantum dot laser, in: Proceedings of the European Conference on Lasers and Electro-Optics, 2007, and the International Quantum Electronics Conference. CLEO/IQEC 2007 (oral presentation IG6-3-THU), IEEE, 2007, pp. 1--1.

  • M. Radziunas, H.-J. Wünsche, B. Krauskopf, M. Wolfrum, External cavity modes in Lang--Kobayashi and traveling wave models, in: Semiconductor Lasers and Laser Dynamics II, D. Lenstra, M. Pessa, I.H. White, eds., 6184 of Proceedings of SPIE, 2006, pp. 61840X/1--61840X/9.

  • T. Perez, M. Radziunas, H.-J. Wünsche, C.R. Mirasso, F. Henneberger, Chaos synchronization of unidirectionally coupled multisection lasers, in: Proceedings of the 32nd European Conference on Optical Communication (ECOC 2006), 2006, pp. paper Tu3.1.5/1--Tu3.1.5/2.

  • U. Troppenz, J. Kreissl, W. Rehbein, C. Bornholdt, T. Gaertner, M. Radziunas, A. Glitzky, U. Bandelow, M. Wolfrum, 40 Gb/s directly modulated InGaAsP passive feedback DFB laser, in: Proceedings of the 32nd European Conference on Optical Communication (ECOC 2006), Postdeadline session, 2006, pp. Th4.5.5/1--Th4.5.5/2.

  • M. Radziunas, U. Bandelow, M. Wolfrum, A. Glitzky, R. Hünlich, U. Troppenz, J. Kreissl, Design of multisection semiconductor laser for 40 Gb/s direct modulation, in: Proceedings of the 31st European Conference on Optical Communication ECOC 2005, Glasgow, UK, September 25--29, 2005, 3, Institution of Electrical Engineers, London, 2005, pp. 677-678.

  • M. Radziunas, Tailoring the dynamics of multisection lasers for 40 Gb/s direct modulation, in: Proceedings of the 5th International Conference on ``Numerical Simulation of Optoelectronic Devices'' (NUSOD'05) in Berlin, September 19--22, 2005, H.-J. Wünsche, J. Piprek, U. Bandelow, H. Wenzel, eds., IEEE, Piscataway, NJ, 2005, pp. 29--30.

  • U. Troppenz, M. Hamacher, M. Radziunas, H. Heidrich, Optical switching of clockwise/anti-clockwise lasing in bus coupled microrings, in: Indium Phosphide and Related Materials, I. Thayne, J. Marsh, C. Bryce, eds., IEEE, Piscataway, 2005, IEEE Catalogue no. 05CH37633C.

  • M. Wolfrum, S. Yanchuk, Synchronous and asynchronous instabilities of two lasers with a long delayed coupling, in: Proceedings of the ENOC-2005 Fifth EUROMECH Nonlinear Dynamics Conference, Eindhoven, The Netherlands, August 7--12, 2005, D.H. VAN Campen, M.D. Lazurko, W.P.J.M. caps">caps">van der Oever, eds., 2005, pp. 2069--2073.

  • S. Yanchuk, K.R. Schneider, L. Recke, Dynamics of two F2F coupled lasers: Instantaneous coupling limit, in: Proceeding of SPIE: Semiconductor Lasers and Laser Dynamics Conference ``Photonics Europe'', 5452, SPIE, Washington, USA, 2004, pp. 51--62.

  • N. Korneyev, M. Radziunas, H.-J. Wünsche, F. Henneberger, Mutually injecting semiconductor lasers: Simulations for short and zero delay, in: Proceedings of SPIE: Semiconductor Lasers and Laser Dynamics Conference ``Photonics Europe'', 5452, SPIE, Washington, 2004, pp. 63--70.

  • V. Tronciu, R.A. Abram, M. Yamada, Dynamics of blue InGaN laser. Self pulsation and excitability, The International Conference ``40 years of TUM'', Chisinau, Moldova, 2004, pp. 112--113.

  • N. Korneyev, M. Radziunas, H.-J. Wünsche, F. Henneberger, Bifurcations of a DFB laser with short optical feedback: Numerical experiment, in: Physics and Simulation of Optoelectronic Devices XI, M. Osinski, H. Amano, P. Blood, eds., 4986 of SPIE Proceedings Series, Bellingham, USA, 2003, pp. 480--489.

  • J. Sieber, L. Recke, K.R. Schneider, Dynamics of multisection semiconductor lasers (in Russian), Proceedings of the International Conference on Differential and Functional Differential Equations, Moscow, Russian Federation, August 11 - 17, 2002, 2 of Sovrem. Probl. Mat. Fund. Naprav., 2003, pp. 70--82.

  • U. Bandelow, H. Gajewski, R. Hünlich, Thermodynamic designed energy model, in: Proceedings of the IEEE/LEOS 3rd International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices (NUSOD'03), J. Piprek, ed., 2003, pp. 35--37.

  • H.-Chr. Kaiser, U. Bandelow, Th. Koprucki, J. Rehberg, Modelling and simulation of strained quantum wells in semiconductor lasers, in: Mathematics --- Key Technology for the Future. Joint Projects Between Universities and Industry, W. Jäger, H.-J. Krebs, eds., Springer, Berlin [u.a.], 2003, pp. 377--390.

  • M. Radziunas, H.J. Wünsche, Dynamics of multisection DFB semiconductor laser: Traveling wave and mode approximation models, in: Physics and Simulation of Optoelectronic Devices X, P. Blood, M. Osinski, Y. Arakawa, eds., 4646 of Proceedings of SPIE, Bellingham, USA, 2002, pp. 27--37.

  • M. Radziunas, H.J. Wünsche, LDSL: A tool for simulation and analysis of longitudinal dynamics in multisection semiconductor lasers, in: Proceedings of the Conference on Numerical Simulation of Semiconductor Optoelectronic Devices, NUSOD-02, Zürich, Switzerland, September 25--27, 2002, A. Tarraf, J. Daleiden, F. Römer, C. Prott ET AL., eds., 2002, pp. 26--27.

  • M. Radziunas, H.-J. Wünsche, O. Brox, F. Henneberger, Excitability of a DFB laser with short external cavity, in: Physics and Simulation of Optoelectronic Devices X, P. Blood, M. Osinski, Y. Arakawa, eds., 4646 of Proceedings of SPIE, Bellingham, USA, 2002, pp. 420--428.

  • U. Bandelow, M. Radziunas, V. Tronciu, H.-J. Wünsche, F. Henneberger, Tailoring the dynamics of diode lasers by passive dispersive reflectors, in: Physics and Simulation of Optoelectronic Devices VIII, R.H. Binder, P. Blood, M. Osinski, eds., 3944 of Proceedings of SPIE, SPIE, Bellingham, WA, 2000, pp. 536--545.

  Preprints, Reports, Technical Reports

  • A. Pimenov, S. Slepneva, G. Huyet, A.G. Vladimirov, Dispersive time-delay dynamical systems, Preprint no. 2324, WIAS, Berlin, 2016, DOI 10.20347/WIAS.PREPRINT.2324 .
    Abstract, PDF (927 kByte)
    We present a theoretical approach to model the dynamics of a dispersive nonlinear system using a set of delay differential equations with distributed delay term. We illustrate the use of this approach by considering a frequency swept laser comprimising a semiconductor optical amplifier (SOA), a tunable bandpass filter and a long dispersive fiber delay line. We demonstrate that this system exhibits a rich spectrum of dynamical behaviors which are in agreement with the experimental observations. In particular, the multimode modulational instability observed experimentally in the laser in the anomalous dispersion regime and leading to a turbulent laser output was found analytically in the limit of large delay time.

  • M. Radziunas, A multi-mode delay differential equation model for lasers with optical feedback, Preprint no. 2294, WIAS, Berlin, 2016, DOI 10.20347/WIAS.PREPRINT.2294 .
    Abstract, PDF (449 kByte)
    In this paper, we discuss the relations between the spatially-distributed traveling wave, Lang-Kobayashi, and a new multi-mode delay differential equation models for Fabry-Perot type semiconductor diode lasers with an external optical feedback. All these models govern the dynamics of the slowly varying complex amplitudes of the optical fields and carrier density. To compare the models, we calculate the cavity modes determined by the threshold carrier density and optical frequency of the steady states in all three models. These calculations show that the Lang-Kobayashi type model is in good agreement with the traveling wave model only for the small feedback regimes, whereas newly derived multi-mode delay differential equation model remains correct even at moderate and large optical feedback regimes.

  • M. Radziunas, Modeling and efficient simulations of broad-area edge-emitting semiconductor lasers and amplifiers, Preprint no. 2292, WIAS, Berlin, 2016, DOI 10.20347/WIAS.PREPRINT.2292 .
    Abstract, PDF (395 kByte)
    We present a (2+1)-dimensional partial differential equation model for spatial-lateral dynamics of edge-emitting broad-area semiconductor devices and several extensions of this model describing different physical effects. MPI-based parallelization of the resulting middlesize numerical problem is implemented and tested on the blade cluster and separate multi-core computers at the Weierstrass Institute in Berlin. It was found, that an application of 25-30 parallel processes on all considered platforms was guaranteeing a nearly optimal performance of the algorithm with the speedup around 20-25 and the efficiency of 0.7-0.8. It was also shown, that a simultaneous usage of several in-house available multi-core computers allows a further increase of the speedup without a significant loss of the efficiency. Finally, an importance of the considered problem and the efficient numerical simulations of this problem were illustrated by a few examples occurring in real world applications.

  • M. Radziunas, Traveling wave modeling of nonlinear dynamics in multisection semiconductor lasers, Preprint no. 2261, WIAS, Berlin, 2016, DOI 10.20347/WIAS.PREPRINT.2261 .
    Abstract, PDF (1980 kByte)
    A hierarchy of 1 (time) + 1 (space) dimensional first-order partial differential equation (traveling wave) models is used for a description of dynamics in individual semiconductor lasers, various multisection semiconductor lasers, and coupled laser systems. Consequent modifications of the basic traveling wave model allow for taking into account different physical effects such as the gain dispersion, the thermal detuning, the spatial hole burning of carriers, the nonlinear gain saturation, or various carrier exchange processes in quantum dot lasers. For illustration, the model was applied for simulations of dynamics in complex ring laser with four branches of filtered feedback. Finally, several advanced techniques for model analysis such as calculation of instantaneous optical modes, finding of steady states, and numerical continuation and bifurcation analysis of the model equations were discussed and illustrated by example simulations.

  • A.G. Vladimirov, G. Huyet, A. Pimenov, Effect of chromatic dispersion on multimode laser dynamics: Delay differential model, Preprint no. 2240, WIAS, Berlin, 2016.
    Abstract, PDF (1463 kByte)
    A set of differential equations with distributed delay is derived for modeling of multimode ring lasers with intracavity chromatic dispersion. Analytical stability analysis of continuous wave regimes is performed and it is demonstrated that sufficiently strong anomalous dispersion can destabilize these regimes.

  Talks, Poster

  • M. Kantner, Modeling and simulation of injection dynamics for quantum dot based single-photon sources, 16th International Conference on Numerical Simulation of Optoelectronic Devices, July 11 - 15, 2016, University of Sydney, Sydney, Australia.

  • D. Peschka, Towards the optimization of on-chip germanium lasers, sc Matheon Workshop, 9th Annual Meeting ``Photonic Devices'', March 3 - 4, 2016, Zuse Institute Berlin, Berlin, March 4, 2016.

  • A. Pimenov, Effect of anomalous dispersion on the dynamics of FDML lasers, Nonlinear Dynamics in Semiconductor Lasers, WIAS, Berlin, June 17, 2016.

  • A. Pimenov, Numerical analysis of dissipative phase solitons in a delay differential equation model of a ring laser, Murphys-HSFS 2016 Workshop, Centre de Recerca Matemàtica, Barcelona, Spain, June 13, 2016.

  • A. Pimenov, Numerical stability analysis of dissipative phase solitons in a DDE model of a semiconductor laser, WIAS Workshop ``Dynamics of Delay Equations, Theory and Applications", WIAS, Berlin, October 14, 2016.

  • U. Bandelow, Nonlinear dynamical effects in photonics: Modeling, simulation and analysis, Coloquio del Instituto de Física, Pontificia Universidad Católica de Chile, Santiago, December 14, 2016.

  • M. Radziunas, A multi-mode delay differential equation model for lasers with optical feedback, Research Seminar, Macquarie University, Department of Physics and Astronomy, Sydney, Australia, July 15, 2016.

  • M. Radziunas, A multi-mode delay differential equation model for lasers with optical feedback, 16th International Conference on Numerical Simulation of Optoelectronic Devices, July 11 - 15, 2016, University of Sydney, Sydney, Australia.

  • M. Radziunas, Modeling and simulations of broad-area edge-emitting semiconductor devices, Kooperationsmeeting mit TRUMPF Laser GmbH, TRUMPF Laser GmbH, Schramberg, January 12, 2016.

  • M. Radziunas, Modeling and simulation of external feedback in broad area lasers with BALaser, HotLas project meeting, Jenoptik, Berlin, November 22, 2016.

  • M. Radziunas, Modeling and simulation of high-power broad area lasers, Kick-off meeting of the EUROSTARS project HIP-Lasers, Monocrom S. L., Vilanova, Barcelona, Spain, October 14, 2016.

  • M. Radziunas, Modeling and simulations of broad-area edge-emitting semiconductor devices, EffiLAS--HotLas Kick-off meeting, Jenoptik Diode Lab GmbH, Berlin, September 14, 2016.

  • M. Radziunas, Modeling, simulations, and analysis of nonlinear dynamics in edge-emitting semiconductor lasers, 1st Leibniz MMS Days, WIAS Berlin, Berlin, January 27, 2016.

  • A. Vladimirov, Delay differential equation models of frequency swept laser light sources, International Conference on Structural Nonlinear Dynamics and Diagnosis (CSNDD'2016), University of Hassan II Casablanca, Marrakech, Morocco, May 24, 2016.

  • A. Vladimirov, Delay differential equations in modeling multimode laser dynamics, Dynamics of Delay Equations, Theory and Applications, WIAS, Berlin, October 14, 2016.

  • A. Vladimirov, Distributed delay model of a frequency swept laser with long fiber delay line, European Semiconductor Laser Workshop (ESLW) 2016, Technische Universität Darmstadt, Darmstadt, September 24, 2016.

  • A. Vladimirov, Interaction of spatial and temporal cavity solitons in mode-locked lasers and passive cavities, 17th International Conference ``Laser Optics 2016'', June 27 - July 1, 2016, Saint Petersburg, Russian Federation, June 29, 2016.

  • A.G. Vladimirov, Delay differential equation models in multi-mode laser dynamics, SFB 910 Symposium: Dynamics of coupled systems and applications to lasers, Technische Universität Berlin, Berlin, April 22, 2016.

  • A.G. Vladimirov, Delay differential models in multimode laser dynamics: Taking chromatic dispersion into account, SPIE Photonics Europe 2016, Conference 9892 ``Semiconductor Lasers and Laser Dynamics'', Session 5, April 3 - 7, 2016, SPIE, Brussels, Belgium, April 5, 2016.

  • A.G. Vladimirov, Distributed delay differential equation models in laser dynamics, Volga Neuroscience Meeting 2016, July 24 - 30, 2016, from Saint Petersburg to Nizhny Novgorod, Russian Federation, July 28, 2016.

  • A.G. Vladimirov, Nonlinear dynamics of a frequency swept laser, Quantum Optics Seminar, Saint-Petersburg State University, Saint-Petersburg, Russian Federation, January 12, 2016.

  • D. Peschka, Mathematical modeling, analysis, and optimization of strained germanium-microbridges, sc Matheon Center Days, April 20 - 21, 2015, Technische Universität Berlin, Institut für Mathematik, Berlin, April 20, 2015.

  • A. Pimenov, Theoretical analysis of fast-moving transverse cavity solitons in a laser with an intracavitary saturable absorber, International Workshop: Waves, Solitons and Turbulence in Optical Systems (WASTOS15), Weierstraß-Institut für Angewandte Analysis und Stochastik, Berlin, October 14, 2015.

  • A. Pimenov, Theoretical analysis of pulse timing jitter in mode-locked semiconductor lasers, International Symposium ``Semiconductor Nanophotonics'', November 2 - 3, 2015, Technische Universität Berlin, November 2, 2015.

  • A. Pimenov, Theoretical investigation of multi-mode dynamics and mode-locking in an inhomogeneously broadened laser, European Semiconductor Laser Workshop 2015 (ESLW), September 24 - 25, 2015, Universidad Carlos III de Madrid, Madrid, Spain, September 24, 2015.

  • S. Yanchuk, Dynamic jittering and exponentially large number of periodic spiking solutions in oscillators with pulsatile delayed feedback, XXXV Dynamics Days Europe 2015, Minisymposium ``Delay-equations for Optoelectronic Systems'', September 7 - 10, 2015, University of Exeter, Centre for Systems, Dynamics and Control, Exeter, UK, September 7, 2015.

  • U. Bandelow, Applied Mathematical Research in Photonics at WIAS Berlin, Meeting TRUMPF-FBH-WIAS, Ferdinand-Braun-Institut, Berlin, November 20, 2015.

  • U. Bandelow, Applied mathematical research in photonics at WIAS Berlin, Innovation Days 2015, December 8 - 9, 2015, Leibniz-Gemeinschaft, Berlin, December 9, 2015.

  • U. Bandelow, Multi-dimensional modeling and simulation of electrically pumped semiconductor-based emitters, Blockseminar of SFB 787 School of Nanophotonics, May 11 - 13, 2015, TU Berlin, Graal-Müritz, May 12, 2015.

  • O. Omel'chenko, Controlling unstable chaos in systems of coupled oscillators, The 8th International Conference on Chaotic Modeling, Simulation and Applications (CHAOS2015), Minisymposium ``Emergent Dynamics and Control'', May 25 - 30, 2015, Institut Henri Poincaré, Paris, France, May 28, 2015.

  • M. Radziunas, R. Herrero, M. Botey, K. Staliunas, Beam shaping in spatially modulated broad area edge-emitting semiconductor lasers, CLEO/Europe-EQEC 2015 Conference, München, June 21 - 25, 2015.

  • M. Radziunas, V. Tronciu, E. Luvsandamdin, Ch. Kürbis, A. Wicht, H. Wenzel, Coexistence of multiple stable continuous-wave states in micro-integrated external-cavity diode lasers, CLEO/Europe-EQEC 2015 Conference, München, June 21 - 25, 2015.

  • M. Radziunas, Computation and analysis of longitudinal optical modes in multisection ring and edge-emitting semiconductor lasers, 20th International Conference on Mathematical Modeling and Analysis (MMA 2015), May 25 - 29, 2015, Sigulda, Latvia, May 27, 2015.

  • M. Radziunas, Modeling and simulations of edge-emitting broad-area semiconductor lasers and amplifiers, 11th International Conference on Parallel Processing and Applied Mathematics (PPAM 2015), September 6 - 9, 2015, Institute of Computer & Information Science, Krakow, Poland, September 8, 2015.

  • M. Radziunas, Nonlinear dynamics in mode locked lasers: Modeling, simulations and analysis, 5th International Conference ``Telecommunications, Electronics and Informatics'' (ICTEI 2015), May 20 - 24, 2015, Chisinau, Moldova, May 21, 2015.

  • A.G. Vladimirov, Control of cavity solitons by time-delayed optical feedback, International Conference ``Dynamics, Bifurcations and Strange Attractors'', July 20 - 24, 2015, Nizhny Novgorod, Russian Federation, July 22, 2015.

  • A.G. Vladimirov, Modelling of mode-locked semiconductor lasers, 24th International SAOT Workshop on Design, Modelling and Simulation of Lasers, June 17 - 20, 2015, Erlangen, June 19, 2015.

  • A.G. Vladimirov, Application of delay differential equations to the analysis of nonlinear dynamics in mode-locked lasers, Colloquium Nonlinear Sciences, Universität Münster, Center for Nonlinear Sciences, May 19, 2015.

  • A.G. Vladimirov, Feedback induced instabilities of cavity solitons, International Symposium on Physics and Applications of Laser Dynamics 2015, November 4 - 6, 2015, CentraleSupélec, Metz, France, November 6, 2015.

  • R.M. Arkhipov, M. Radziunas, A.G. Vladimirov, Theoretical analysis of the influence of external periodic forcing on nonlinear dynamics of passively mode-locked semiconductor lasers, XIV School Seminar ``Wave Phenomena In Inhomogeneous Media'' (Waves 2014), May 26 - 31, 2014, Moscow, Russian Federation, May 27, 2014.

  • R.M. Arkhipov, M.V. Arkhipov, Mode-locking in two section and single section lasers due to coherent interaction of light and matter in the gain and absorbing media, XIV School Seminar ``Wave Phenomena In Inhomogeneous Media'' (Waves 2014), Moscow, Russian Federation, May 26 - 31, 2014.

  • R.M. Arkhipov, Generation of ultra-short optical pulses in lasers due to coherent interaction of light with resonant medium in laser cavity, 17th International Conference ``School Foundations & Advances in Nonlinear Science'', September 29 - October 4, 2014, Minsk, Belarus, October 1, 2014.

  • R.M. Arkhipov, Modeling of mode-locked semiconductor lasers with external periodic forcing, "SPIE OPTO Symposium 2014", January 30 - February 8, 2014, San Francisco, USA, February 3, 2014.

  • R.M. Arkhipov, Modelling of mode-locked QD lasers, PROPHET Meeting, June, 26-27, 2014, June 25 - 28, 2014, Cork, Ireland, June 27, 2014.

  • R.M. Arkhipov, Pulse repetition-frequency multiplication of passively mode-locked semiconductor lasers coupling to an external passive cavity, ``SPIE Photonics Europe'', Brussels, Belgium, April 14 - 17, 2014.

  • R.M. Arkhipov, Theoretical analysis of coherent passive and self mode-locking in lasers, 16th International Conference ``Laser Optics'', June 30 -- July 4, 2014, St. Petersburg, Russian Federation, June 29 - July 6, 2014.

  • R.M. Arkhipov, Theoretical investigation of a passively mode-locked semiconductor laser with external periodic forcing, ``SPIE Photonics Europe'', Brussels, Belgium, April 14 - 17, 2014.

  • R.M. Arkhipov, Theoretical study of transient Chrenkov radiation from periodic resonance medium excited at the superluminal velocity, 16th International Conference "Laser Optics'', June 30 -- July 4, 2014, June 29 - July 6, 2014, St. Petersburg, Russian Federation, July 2, 2014.

  • R.M. Arkhipov, Transient Cherenkov radiation from an inhomogeneous resonant medium excited by an ultrashort laser pulse at superluminal velocity, "SPIE OPTO Symposium 2014", January 30 - February 8, 2014, San Francisco, USA, February 3, 2014.

  • M. Kantner, Th. Koprucki, H.-J. Wünsche, Numerical simulation and optimization of electrical resistance in GaAs/Al(x)Ga(1-x)As-based distributed Bragg reflectors, International Nano-Optoelecteonics Workshop (iNOW 2014), St. Petersburg, Russian Federation, August 9 - 23, 2014.

  • A. Pimenov, Robust homocline in a predator-prey system with hysteresis, International Multidisciplinary Workshop MURPHYS-HSFS-2014, WIAS Berlin, April 9, 2014.

  • A. Pimenov, The effect of noise on timing jitter in a mode-locked semiconductor laser, International Workshop "Nonlinear Dynamics in Semiconductor Lasers (NDSL14)", May 12--14, 2014, WIAS Berlin, May 12, 2014.

  • A. Pimenov, Theoretical analysis of dynamics of passively mode-locked semiconductor lasers with a focus on timing jitter, PhD Student Seminar, SFB 787 Halbleiter-Nanophotonik, Technische Universität Berlin, June 6, 2014.

  • A. Pimenov, Theoretical analysis of passively mode-locked inhomogeneously broadened lasers, 14th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD 2014), August 31 - September 4, 2014, Palma de Mallorca, Spain, September 3, 2014.

  • M. Radziunas, Computation and analysis of optical modes in multisection ring and edge-emitting semiconductor lasers, International Symposium ``Advances in Nonlinear Photonics'', September 29 - October 3, 2014, Minsk, Belarus, September 30, 2014.

  • M. Radziunas, Effective numerical algorithm for simulations of broad area semiconductor lasers, "International Workshop on Application of Parallel Computation in Industry and Engeneering (APCIE) in conjunction with EURO-PAR' 2014'', August 25 - 26, 2014, Porto, Portugal, August 25, 2014.

  • M. Radziunas, Longitudinal mode analysis of multisection ring and edge-emitting semiconductor lasers, 14th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD 2014), August 31 - September 5, 2014, Palma de Mallorca, Spain, September 2, 2014.

  • M. Radziunas, Modeling and simulations of beam quality improvement in broad area semiconductor devices, 19th International Conference Mathematical Modelling and Analysis, May 26 - 29, 2014, Druskininkai, Lithuania, May 26, 2014.

  • M. Radziunas, Simulation and analysis of the external cavity diode lasers with LDSL-tool, Research Seminar, Technical University of Moldova, Department of Physics, Chisinau, June 4, 2014.

  • M. Radziunas, Simulations and analysis of beam quality improvement in spatially modulated broad area edge-emitting semiconductor devices, Conference SPIE Photonics Europe, April 14-17, 2014, April 14 - 17, 2014, Brussels, Belgium, April 15, 2014.

  • M. Radziunas, Simulations and analysis of beam shaping in spatially modulated broad area edge-emitting devices, 24th International Semiconductor Laser Conference (ISLC 14), September 7 - 10, 2014, Palma de Mallorca, Spain, September 7, 2014.

  • U. Bandelow, Analytical rogue wave solutions in extended NLS-type equations, International Workshop ``Rogue Waves, Dissipative Solitons, Plasmonics, Supercontinuum and Special Fibres'', July 25 - 26, 2014, Barcelona, Spain, July 25, 2014.

  • U. Bandelow, Dynamics of Semiconductor Lasers, Autumn School on Laser Dynamics, September 24 - 28, 2014, University of Szeged, Bolyai Institute, Hungary.

  • U. Bandelow, Dynamics of classical optical fields in semiconductor lasers, International Nano-Optoelectronics Workshop (iNOW 2014), August 10 - 22, 2014, Luga and St. Petersburg, Russian Federation, August 11, 2014.

  • U. Bandelow, Solitons who do not want to be too short in duration, Konferenz ``Nonlinear Photonics'', July 27 - 31, 2014, Barcelona, Spain, July 29, 2014.

  • C. Brée, M. Kretschmar, T. Nagy, M. Hofmann, A. Demircan, U. Morgner, M. Kovacev, Fingerprint of self-compression in the high harmonic spectrum from a filament, High-Intensity Lasers and High-Field Phenomena (HILAS), Berlin, March 18 - 20, 2014.

  • C. Brée, Manipulating optical solitons with a group-velocity horizon, Vortrag und Junior Researcher im Rahmen des Rank Prize Fund Symposiums, June 16 - 19, 2014, Grasmere, UK, June 18, 2014.

  • A.G. Vladimirov, Application of delay differential equations in modeling of multimode lasers, The second International Conference on Structural Nonlinear Dynamics and Diagnosis (CSNDD'2014), May 19 - 21, 2014, Agadir, Morocco, May 19, 2014.

  • A.G. Vladimirov, Delay differential equation models of multimode laser dynamics, III Dynamics Days South America 2014, November 3 - 7, 2014, Vina del Mar, Chile, November 5, 2014.

  • A.G. Vladimirov, Delay differential equation models of multimode lasers, International Symposium ``Advances in Nonlinear Photonics'', September 29 - October 3, 2014, Minsk, Belarus, October 30, 2014.

  • A.G. Vladimirov, Interaction of optical breathers in mode-locked lasers and passive fiber cavities, Conference SPIE Photonics Europe, April 14-17, 2014, April 14 - 17, 2014, Brussels, Belgium, April 15, 2014.

  • A.G. Vladimirov, Modeling of multimode laser dynamics by means of delay differential equations, 14th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD 2014), September 1 - 4, 2014, Palma de Mallorca, Spain, September 3, 2014.

  • M. Wolfrum, Bifurcations and nonuniversal transitions to synchrony in the Sakaguchi--Kuramoto model, International Conference on Control of Self-organizing Nonlinear Systems, Rostock-Warnemünde, August 24 - 28, 2014.

  • M. Wolfrum, Chimera states: Patterns of coherence and incoherence in coupled oscillator systems, Institut Non Linéaire de Nice -- Sophia Antipolis, France, October 10, 2014.

  • M. Wolfrum, Delay-differential equations for semiconductor lasers, Autumn School on Laser Dynamics, September 24 - 28, 2014, University of Szeged, Bolyai Institute, Hungary.

  • R.M. Arkhipov, M. Radziunas, A.G. Vladimirov, Numerical simulation of passively mode-locked semiconductor lasers under dual mode optical injection regime, ICONO/LAT 2013 Conference, Russian Academy of Sciences, Moscow, June 17 - 22, 2013.

  • R.M. Arkhipov, Theoretical analysis of periodically forced semiconductor mode-locked lasers, 2013 International Nano-Optoelectronics Workshop (iNOW'2013), Cargèse, France, August 19 - 30, 2013.

  • R.M. Arkhipov, Spectral and temporal characteristics of radiation from a periodic resonant medium excited at the superluminal velocity, ICONO/LAT 2013 Conference, June 17 - 22, 2013, Russian Academy of Sciences, Moscow, June 20, 2013.

  • R.M. Arkhipov, Theoretical analysis of mode-locked semiconductor lasers with external periodic forcing, 4th G-RISC International Student Conference "Science and Progress 2013", September 30 - October 4, 2013, Sankt Petersburg, Russian Federation, October 2, 2013.

  • R.M. Arkhipov, Transient Cherenkov radiation from a periodic resonant medium excited by an ultrashort laser pulse propagating at superluminal velocity, 4th G-RISC International Student Conference "Science and Progress 2013", September 30 - October 4, 2013, Sankt Petersburg, Russian Federation, October 2, 2013.

  • R.M. Arkhipov, Transient Cherenkov radiation from an inhomogeneous resonant string excited at superluminal velocity, Extreme Nonlinear Optics & Solitons, Berlin, October 28 - 30, 2013.

  • M. Hofmann, Probing the transient optical response in femtosecond filaments, Extreme Nonlinear Optics & Solitons, Berlin, October 28 - 30, 2013.

  • A. Pérez-Serrano, Bifurcation diagrams of traveling wave models, International Workshop ''Modeling, Analysis and Simulation of Optical Modes in Photonic Devices'' MASOMO'13, WIAS Berlin, April 12, 2013.

  • A. Pérez-Serrano, Emission wavelength multistability in semiconductor ring lasers, CLEO/EUROPE -- IQEC 2013, München, May 12 - 16, 2013.

  • A. Pérez-Serrano, Multi-channel wavelength conversion using four-wave mixing in semiconductor ring lasers, Conference: CLEO Europe 2013, May 12 - 16, 2013, World of Photonics Congress, München, May 16, 2013.

  • A. Pimenov, N. Rebrova, D. Rachinksii, A.G. Vladimirov, Theoretical analysis of timing jitter in two-section passively mode-locked semiconductor lasers, CLEO/EUROPE -- IQEC 2013, München, May 12 - 13, 2013.

  • A. Pimenov, Effects of noise on a periodic solution of a system of nonlinear delay-differential equations in application to semiconductor lasers, Equadiff13, August 26 - 30, 2013, Charles University, Prague, Czech Republic, August 27, 2013.

  • A. Pimenov, Modelling permanent effects of a temporary stimulus (PETS) in predator-prey and SIR systems, Equadiff13, MS20 -- Slow-fast and Hysteretic Models of Population Dynamics, August 26 - 30, 2013, Prague, Czech Republic, August 26, 2013.

  • A. Pimenov, Theoretical analysis of delayed feedback control of solitons in semiconductor cavity, Extreme Nonlinear Optics & Solitons, Berlin, October 28 - 30, 2013.

  • M. Radziunas, Nonlinear dynamics in mode-locked lasers: Modeling, simulations and analysis, 2013 International Nano-Optoelectronics Workshop (iNOW'2013), August 19 - 31, 2013, Cargèse, France, August 28, 2013.

  • M. Radziunas, Theoretical study of beam quality improvement in spatially modulated broad area edge-emitting devices, CLEO/EUROPE -- IQEC 2013, München, May 12 - 16, 2013.

  • M. Radziunas, Traveling wave modeling and mode analysis of semiconductor ring lasers, CLEO/EUROPE -- IQEC 2013, München, May 12 - 16, 2013.

  • M. Radziunas, Modeling and simulations of beam stabilization in edge-emitting broad-area semiconductor devices, Parallel Processing and Applied Mathematics (PPAM 2013), September 8 - 11, 2013, Warsaw, Poland, September 11, 2013.

  • S. Slepneva, B. O'Shuaghnessy, B. Kelleher, S.P. Hegarty, A.G. Vladimirov, G. Huyet, Dynamics of Fourier domain mode locked lasers, CLEO/EUROPE -- IQEC 2013, München, May 11 - 17, 2013.

  • E. Averlant, A.G. Vladimirov, K. Panajotov, H. Tienpont, M. Tlidi, Delay feedback induces drift of multipeaks cavity solitons in VCSEL devices, CLEO/EUROPE -- IQEC 2013, München, May 11 - 17, 2013.

  • M. Tlidi, A.G. Vladimirov, A. Pimenov, K. Panajotov, D. Puzyrev, S.M. Yanchuk, S.M. Gurevich, Delay induced instabilities of cavity solitons in passive and active laser systems, CLEO/EUROPE -- IQEC 2013, München, May 11 - 17, 2013.

  • U. Bandelow, Turbulence and extreme events in non- linear optics, MATHEON Center Days (ECMATH), Technische Universität Berlin, November 5, 2013.

  • U. Bandelow, Dynamics of optical fields in semiconductor lasers, International Workshop ''Modeling, Analysis and Simulation of Optical Modes in Photonic Devices'' MASOMO'13, WIAS Berlin, April 10, 2013.

  • U. Bandelow, Modeling and simulation of semiconductor lasers for high speed applications, The Russell Berrie Nanotechnology Institute, Haifa, Israel, November 20, 2013.

  • U. Bandelow, Semiconductor lasers for high speed applications: Modeling and simulation, Technische Universität Wien, Institut für Photonik, Austria, June 7, 2013.

  • U. Bandelow, Ultrashort optical solitons in nonlinear media with arbitrary dispersion, 13th International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2013, August 16 - 24, 2013, Vancouver, Canada, August 22, 2013.

  • U. Bandelow, Ultrashort solitons and rogue waves in nonlinear dispersive optical media, Optics Seminar, Weizmann Institute, Rehovot, Israel, November 27, 2013.

  • U. Bandelow, Comprehensive mathematical modeling and simulation of semiconductor lasers, 2013 International Nano-Optoelectronics Workshop (iNOW'2013), August 19 - 30, 2013, Cargèse, France, August 26, 2013.

  • U. Bandelow, Heteroclinic connections and limiting cases in integrable NLS-type equations, International Workshop: Extreme Nonlinear Optics & Solitons, October 28 - 30, 2013, WIAS Berlin, October 30, 2013.

  • U. Bandelow, Solitons on a background, rogue waves, and classical soliton solutions of the Sasa--Satsuma equation, VI Rio de la Plata Workshop on Laser Dynamics and Nonlinear Photonics, December 6 - 13, 2013, Montevideo, Uruguay, December 17, 2013.

  • A.G. Vladimirov, Interaction of oscillating dissipative optical solitons, International Conference ``Dynamics, Bifurcations, and Strange Attractors'', July 1 - 5, 2013, Nizhny Novgorod State University, Russian Federation, July 5, 2013.

  • A.G. Vladimirov, Weak interaction of localized structures of light, Dynamical Systems and PDEs Seminar, July 1 - 5, 2013, University of Surrey, UK, July 5, 2013.

  • R. Arkhipov, M. Radziunas, A. Vladimirov, Theoretical analysis of hybrid mode-locked quantum dot semiconductor lasers, International Conference ``Laser Optics 2012'', St. Petersburg, Russian Federation, June 25 - 29, 2012.

  • R. Arkhipov, M.V. Arkhipov, S.A. Pulkin, Numerical simulations of lasing without population inversion in two-level optically dense medium, International Conference ``Laser Optics 2012'', St. Petersburg, Russian Federation, June 25 - 29, 2012.

  • R. Arkhipov, Mathematical modeling of mode-locking in semiconductor quantum dot lasers, TU Berlin, SFB 787, Doktorandenseminar, Technische Universität Berlin, February 17, 2012.

  • R. Arkhipov, Modelling of mode-locked quantum dot lasers, Initial Training Network PROPHET Workshop: Theory and Modelling in Photonics, April 11 - 19, 2012, Pavia, Italy, April 12, 2012.

  • R. Arkhipov, Numerical analysis of hybrid mode-locking in edge-emitting quantum dot semiconductor lasers, SPIE Photonics Europe Conference, Brussels, Belgium, April 16 - 19, 2012.

  • R. Arkhipov, Emission of the new frequencies in the resonant medium under the conditions of excitation by an object propagating at superluminal velocity, XIV All-Russian Scientific School-Seminar ``Wave Phenomena in Inhomogeneous Media'' (Waves-2012), May 21 - 28, 2012, Zvenigorod, Russian Federation, May 24, 2012.

  • R. Arkhipov, Hybrid mode-locking in semiconductor quantum dot lasers: Simulation, analysis and comparison with experiments, ITN PROPHET Mid-Term Review Meeting, October 9 - 11, 2012, Paris, France, October 11, 2012.

  • R. Arkhipov, Numerical analysis of hybrid mode-locking in semiconductor quantum dot lasers, XIV All-Russian Scientific School-Seminar ``Wave Phenomena in Inhomogeneous Media'' (Waves-2012), Zvenigorod, Russian Federation, May 21 - 26, 2012.

  • R. Arkhipov, Spectral and temporal characteristics of resonant medium radiation excited at the superluminal velocity, International Symposium Advances in Nonlinear Photonics, September 23 - 27, 2012, Belarusian State University, Minsk, Belarus, September 26, 2012.

  • R. Arkhipov, The new principle of the all-optical streak camera based on ultrafast laser beam deflection by light-induced coherent photonic crystal, International Symposium Advances in Nonlinear Photonics, September 23 - 27, 2012, Belarusian State University, Minsk, Belarus, September 25, 2012.

  • R. Arkhipov, Theoretical investigation of hybrid mode-locking in two-section semiconductor quantum dot lasers, International Symposium Advances in Nonlinear Photonics, September 23 - 27, 2012, Belarusian State University, Minsk, Belarus, September 24, 2012.

  • A. Pérez-Serrano, J. Javaloyes, S. Balle, Multiple channel wavelength conversion using a semiconductor ring laser, European Semiconductor Laser Workshop 2012, September 20 - 23, 2012, Vrije Universiteit Brussel, Brussels, Belgium, September 21, 2012.

  • A. Pimenov, Theoretical analysis of a multi-stripe laser array with external off-axis feedback, SPIE Photonics Europe 2012 Conference, April 16 - 19, 2012, Brussels, Belgium, April 17, 2012.

  • M. Radziunas, Hybrid mode-locking in semiconductor lasers: Simulations, analysis and experiments, ESLW2012 Workshop, September 21 - 22, 2012, Brussels, Belgium, September 21, 2012.

  • M. Radziunas, Spatial rocking for improving the spatial quality of the beam of broad area semiconductor lasers, SPIE Photonics Europe Conference, April 16 - 19, 2012, Brussels, Belgium, April 17, 2012.

  • M. Radziunas, Theoretical study of beam quality improvement in broad area semiconductor devices, International Symposium ``Advances in Nonlinear Photonics'', September 23 - 27, 2012, Belarusian State University, Minsk, September 24, 2012.

  • M. Radziunas, Theoretical study of beam quality improvment in broad area semiconductor devices, ESLW2012 Workshop, September 21 - 22, 2012, Brussels, Belgium, September 21, 2012.

  • U. Bandelow, Mathematical modeling and simulation of semiconductor lasers, Block Seminar of SFB 787 School of Nanophotonics, May 13 - 16, 2012, Technische Universität Berlin, Graal-Müritz, May 15, 2012.

  • U. Bandelow, Rogue waves in extended nonlinear Schrödinger equations: Integrable Sasa--Satsuma case, The Optical Society's (OSA) Annual Meeting Frontiers in Optics 2012, October 13 - 19, 2012, Rochester Section of the Optical Society of America, Rochester, USA, October 18, 2012.

  • U. Bandelow, Rogue waves in the Sasa--Satsuma equation, International Symposium ``Advances in Nonlinear Photonics'', September 24 - 28, 2012, Belarusian State University, Minsk, September 25, 2012.

  • U. Bandelow, Spatio-temporal pulse propagation in nonlinear dispersive optical media, 12th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD12), August 26 - September 4, 2012, Shanghai, China, August 30, 2012.

  • O. Omel'chenko, Nonuniversal transitions to synchrony in the Sakaguchi--Kuramoto model, Colloquium on Complex and Biological Systems, Universität Potsdam, November 26, 2012.

  • O. Omel'chenko, Partially synchronized patterns in systems of non-locally coupled phase oscillators, Institut für Mathematik, Kiev, Ukraine, February 6, 2012.

  • A.G. Vladimirov, Nonlinear dynamics in lasers, FP7 Marie Curie Initial Training Network PROPHET Workshop: Theory and Modelling in Photonics, April 11 - 13, 2012, Pavia, Italy, April 11, 2012.

  • A.G. Vladimirov, Theoretical modeling of mode-locked quantum dot lasers, SPIE Photonics Europe Conference, April 16 - 19, 2012, Brussels, Belgium, April 18, 2012.

  • M. Wolfrum, Collective and localized Turing patterns on irregular networks, Seminar Complex Nonlinear Processes in Chemistry and Biology, Fritz-Haber-Institut, Berlin, June 15, 2012.

  • M. Radziunas, Broadening of mode-locking pulses in quantum-dot semiconductor lasers: Simulation, analysis and experiments, International Workshop ``Nonlinear Photonis: Theory, Materials, Applications'', August 24 - 26, 2011, St. Petersburg, Russian Federation, August 24, 2011.

  • A.G. Vladimirov, Cavity solitons in broad area laser systems with delayed feedback, Yaroslavl Demidov State University, Russian Federation, September 6, 2011.

  • A.G. Vladimirov, Mobility properties of 2D cavity solitons in systems with delayed feedback, CLEO/Europe-EQEC Conference, 22-26 May 2011, München, May 26, 2011.

  • A.G. Vladimirov, Mode-locking in quantum well and quantum dot semiconductor lasers, Yaroslavl Demidov State University, Russian Federation, August 16, 2011.

  • A.G. Vladimirov, Synchronization of interacting temporal cavity oscillons, CLEO/Europe-EQEC Conference, 22-26 May 2011, München, May 26, 2011.

  • A. Wilms, A. Schliwa, Th. Koprucki, D. Breddermann, P. Mathé, A. Knorr, U. Bandelow, Theory of Coulomb scattering from two- and three-dimensional reservoirs to quantum dot states, 11th International Conference on Physics of Light-Matter Coupling in Nanostructures (PLMCN11), Berlin, April 6, 2011.

  • A. Wilms, Current state of our model for Coulomb scattering in semiconductor quantum dot lasers, Universität Bremen, Institut für theoretische Physik, Arbeitsgruppe Halbleiterphysik, February 23, 2011.

  • A. Wilms, Theory of Coulomb scattering in semiconductor quantum dot lasers, Mathematical Challenges of Quantum Transport in Nano-Optoelectronic Systems, February 4 - 5, 2011, WIAS, February 4, 2011.

  • M. Radziunas, K. Staliunas, Spatial ``rocking'' in broad area semiconductor lasers, European Semiconductor Laser Workshop (ESLW) 2011, Lausanne, Switzerland, September 23 - 24, 2011.

  • M. Radziunas, Spatial "rocking" in broad emission area semiconductor lasers, CLEO/Europe-EQEC Conference, 22-26 May 2011, München, May 25, 2011.

  • M. Radziunas, Strong asymmetry of mode-locking pulses in quantum-dot semiconductor lasers, CLEO/Europe-EQEC Conference, 22-26 May 2011, München, May 24, 2011.

  • M. Radziunas, Drittmittelaquise - Wie schreibe ich einen Drittmittelantrag ?, Weiterbildungsveranstaltung SW 014-SS 11, FU Berlin, August 17, 2011.

  • V.Z. Tronciu, M. Radziunas, S. Schwertfeger, A. Klehr, U. Bandelow, H. Wenzel, Modelling of dynamics in broad area semiconductor devices: Picosecond pulse amplification in tapered amplifiers, European Semiconductor Laser Workshop (ESLW) 2011, Lausanne, Switzerland, September 23 - 24, 2011.

  • A.G. Vladimirov, Delay differential equations model of a mode-locked semiconductor laser, Yaroslavl Demidov State University, Russian Federation, August 18, 2011.

  • A.G. Vladimirov, Delay differential equations models in laser dynamics, Yaroslavl Demidov State University, Russian Federation, August 30, 2011.

  • A. Wilms, About the Influence of the carrier reservoir dimensionality on Coulomb scattering in quantum dot materials, SFB 787, Graduiertenkolleg, Doktorandenseminar, Technische Universität Berlin, December 2, 2011.

  • C. Brée, A. Demircan, G. Steinmeyer, Saturation of the All-Optical Kerr Effect, CLEO/Europe-EQEC Conference, 22-26 May 2011, München, May 26, 2011.

  • V. Tronciu, High power lasers for modern technologies, NANO-2011 Cooperation and Networking of Universities and Research Institutes --- Study by Doing Research, October 6 - 9, 2011, Academy of Science, Institute of Electronic Engineering and Nanotechnologies, Kishinev, Moldova, October 8, 2011.

  • V. Tronciu, Picoseconds pulse amplification --- Theory and experiment, Technical University of Moldova, Department of Physics, Chisinau, April 20, 2011.

  • V. Tronciu, Nonlinear dynamics in semiconductor lasers --- Theory and experiments, Academy of Sciences of the Republic of Moldova, Institute of Energy, Chisinau, July 28, 2011.

  • M. Radziunas, Modeling, simulation and analysis of nonlinear dynamics in multisection semiconductor lasers, 15th International Conference ``Mathematical Modelling and Analysis'' (MMA2010), May 26 - 29, 2010, Druskininkai, Lithuania, May 29, 2010.

  • M. Radziunas, Traveling wave modeling, simulation and analysis of quantum-dot mode-locked semiconductor lasers, Conference on Semiconductor Lasers and Laser Dynamics IV within SPIE Photonics Europe 2010, April 12 - 16, 2010, Brussels, Belgium, April 14, 2010.

  • V.Z. Tronciu, C. Fiebig, M. Lichtner, H. Wenzel, Numerical and experimental investigations of DBR tapered lasers, The 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), May 20 - 23, 2010, Technical University of Moldova, Chisinau, Moldova, May 20, 2010.

  • V.Z. Tronciu, S.S. Rusu, C. Pîrtac, Dynamics of coupled semiconductor lasers. On/off phase shift keying encription method, The 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), Chisinau, Moldova, May 20 - 23, 2010.

  • V.Z. Tronciu, Chaos based communication using multi-section semiconductor laser, École Polytechnique Fédérale de Lausanne (EPFL-SB), Laboratory of Physics of Nanostructures, Switzerland, September 9, 2010.

  • V.Z. Tronciu, Nonlinear dynamics in semiconductor lasers --- Theory and experiments, Vrije Universiteit Brussel, Department of Applied Physics and Photonics, Belgium, September 16, 2010.

  • V.Z. Tronciu, Semiconductor laser a key element for new generation optoelectronic systems, The 3rd International Conference on Telecommunications, Electronics and Informatics (ICTEI 2010), May 20 - 23, 2010, Technical University of Moldova, Chisinau, Moldova, May 21, 2010.

  • A.G. Vladimirov, Introduction to mode-locking in lasers, Graduate College of the Collaborative Research Center SFB 787 ``Semiconductor Nanophotonics: Materials, Models, Devices'', May 9 - 11, 2010, Technische Universität Berlin, Institut für Festkörperphysik, Graal-Müritz, May 10, 2010.

  • A.G. Vladimirov, Locking characteristics of a 40 GHz hybrid mode-locked monolithic quantum dot laser, Conference on Semiconductor Lasers and Laser Dynamics IV within SPIE Photonics Europe 2010, April 12 - 16, 2010, Brussels, Belgium, April 14, 2010.

  • A.G. Vladimirov, Nonlinear dynamics in lasers, Technische Universität Berlin, Institut für Festkörperphysik, March 24, 2010.

  • U. Bandelow, Semiconductor laser instabilities and dynamics (short course), 10th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) 2010, September 6 - 9, 2010, Atlanta, USA, September 6, 2010.

  • U. Bandelow, Semiconductor lasers for high speed applications: Modeling and simulation, International Workshop on High Speed Semiconductor Lasers (HSSL 2010), October 7 - 8, 2010, Wroclaw University of Technology, Institute of Physics, Poland, October 7, 2010.

  • T. Girnyk, Multistability of twisted states in non-locally coupled Kuramoto-type models, Universität Potsdam, Institut für Physik und Astronomie, October 25, 2010.

  • T. Girnyk, Multistability of twisted states in non-locally coupled Kuramoto-type models, École Polytechnique Fédérale de Lausanne, Laboratory of Nonlinear Systems (EPFL-LANOS), Switzerland, November 17, 2010.

  • T. Girnyk, Stability of twisted states in repulsive Kuramoto models, Research Group Seminar, Freie Universität Berlin, research group ``Nonlinear Dynamics'', December 2, 2010.

  • M. Lichtner, Modeling and simulation of high power high brightness tapered and broad area lasers, Universität Potsdam, Mathematisch-Naturwissenschaftliche Fakultät, Institut für Physik und Astronomie, Arbeitsgruppe Photonik, Berlin, February 24, 2010.

  • M. Radziunas, Theoretical investigations of the pulse broadening in mode-locked quantum-dot semiconductor lasers, European Semiconductor Laser Workshop 2010, September 24 - 25, 2010, University of Pavia, Italy, September 24, 2010.

  • M. Wolfrum, Instabilities of laser devices, Doktorandenseminar des SFB 787 Halbleiter-Nanophotonik, Technische Universität Berlin, April 23, 2010.

  • M. Radziunas, LDSL-tool: a software for simulation and analysis of Longitudinal Dynamics in Semiconductor Lasers, Ferdinand-Braun-Institut für Höchstfrequenztechnik, Berlin, January 6, 2009.

  • M. Radziunas, Modeling, simulations and analysis of quantum-dot mode locked lasers, Minisymposium ``Nonlinear Dynamics in Quantum Dot Device'', November 9, 2009, WIAS, November 9, 2009.

  • M. Radziunas, Numerical bifurcation analysis for multi-section semiconductor lasers, International Workshop ``Trends in Bifurcation Analysis: Methods and Applications (TBA 2009)'', June 3 - 5, 2009, Milan, Italy, June 3, 2009.

  • M. Radziunas, Simulation and analysis of longitudinal dynamics in semiconductor laser devices, Tyndall National Institute, Photonics Theory Group, Cork, Ireland, June 25, 2009.

  • M. Radziunas, Simulation of switching between stable unidirectional states in semiconductor ring lasers, European Conference on Lasers and Electro-Optics and the XIth European Quantum Electronics Conference 2009 (CLEOtextsuperscript®/Europe -- EQEC 2009), Munich, June 14 - 19, 2009.

  • M. Radziunas, Traveling wave modeling and mode analysis of mode-locked quantum dot semiconductor lasers, European Semiconductor Laser Workshop 2009, September 25 - 26, 2009, Vienna University of Technology, Austria, September 26, 2009.

  • M. Radziunas, Traveling wave modeling of mode-locked quantum dot semiconductor lasers, European Conference on Lasers and Electro-Optics and the XIth European Quantum Electronics 2009 Conference (CLEO®/Europe-EQEC), June 15 - 19, 2009, Munich, June 16, 2009.

  • V.Z. Tronciu, M. Lichtner, M. Radziunas, U. Bandelow, H. Wenzel, M. Spreemann, Calculation of improved features of distributed-feedback tapered master-oscillator power-amplifiers, European Conference on Lasers and Electro-Optics and the XIth European Quantum Electronics Conference 2009 (CLEOtextsuperscript®/Europe -- EQEC 2009), Munich, June 14 - 19, 2009.

  • V.Z. Tronciu, Chaos based communication using multi-section semiconductor laser, Seminar of the DFG Collaborative Research Center (SFB) 787 ``Semiconductor Nanophotonics: Materials, Models, Devices'', Technische Universität Berlin, May 14, 2009.

  • V.Z. Tronciu, Dynamics and stability improvement of DFB tapered master-oscillator power-amplifiers, 6th International Conference on Microelectronics and Computer Science, October 1 - 3, 2009, Technical University of Moldova/Academy of Sciences of Moldova, Chisinau, Moldova, October 2, 2009.

  • V.Z. Tronciu, Dynamics of DFB tapered master-oscillator power-amplifiers. Applications, Seminar of the Laboratory of Theory of Semiconductors and Quantum Electronics, Academy of Sciences of Moldova, Institute of Applied Physics, Chisinau, October 9, 2009.

  • V.Z. Tronciu, Numerical simulations of DFB-MOPA and DBR tapered power-amplifiers, Photo Meeting, University of the Balearic Islands, Institute for Cross-Disciplinary Physics and Complex Systems (IFISC), Palma de Mallorca, Spain, June 26, 2009.

  • V.Z. Tronciu, Numerical simulations of DFB-MOPA and DBR tapered power-amplifiers, Universidad Politécnica de Madrid, Departamento de Tecnología Fotónica, Spain, June 29, 2009.

  • A.G. Vladimirov, Hybrid mode-locking in a 40 GHz monolithic quantum dot laser, European Conference on Lasers and Electro-Optics and the XIth European Quantum Electronics 2009 Conference (CLEO®/Europe-EQEC), June 14 - 19, 2009, Munich, June 16, 2009.

  • A. Wilms, E. Malic, J.-E. Kim, Th. Koprucki, A. Knorr, U. Bandelow, Microscopic model of semiconductor QD-gain, International Nano-Optoelectronic Workshop (iNOW 2009), Stockholm, Sweden, and Berlin, Germany, August 2 - 15, 2009.

  • A. Wilms, Gewinnspektren von Quantenpunkten, Doktorandenseminar des Graduiertenkollegs des SFB 787 "Halbleiter-Nanophotonik", Technische Universität Berlin, November 20, 2009.

  • U. Bandelow, 3D semiclassical multi-species modeling of QD lasers, International Nano-Optoelectronic Workshop (iNOW 2009), August 2 - 15, 2009, Royal Institute of Technology/Technical University of Berlin, Stockholm/Berlin, Sweden, August 14, 2009.

  • U. Bandelow, Improving the stability of distributed-feedback tapered master-oscillator power-amplifiers, 9th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) 2009, September 14 - 18, 2009, Gwangju Institute of Science and Technology (GIST), Korea (Republic of), September 15, 2009.

  • U. Bandelow, Semiconductor laser instabilities and dynamics (short course), 9th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) 2009, September 14 - 18, 2009, Gwangju Institute of Science and Technology (GIST), Korea (Republic of), September 16, 2009.

  • M. Radziunas, Numerical bifurcation analysis of a PDE model for multisection semiconductor lasers, Workshop ``Bifurcation in Dynamical Systems with Applications'', May 19 - 21, 2008, Universität Bielefeld, Fakultät für Mathematik, May 20, 2008.

  • M. Radziunas, Simulation of CW and CCW mode switching in semiconductor ring lasers, European Semiconductor Laser Workshop ESLW 2008, September 19 - 20, 2008, Technische Universiteit Eindhoven, Netherlands, September 19, 2008.

  • M. Radziunas, Traveling wave modelling of seminconductor ring lasers, SPIE Photonics Europe Conference, April 7 - 10, 2008, Strasbourg, France, April 9, 2008.

  • A.G. Vladimirov, Bifurcation analysis of a model of passively mode-locked quantum dot laser, SPIE Photonics Europe Conference, April 7 - 10, 2008, Strasbourg, France, April 8, 2008.

  • A.G. Vladimirov, Delay differential models of passively mode-locked quantum dot lasers, Laser Optics 2008, June 23 - 28, 2008, St. Petersburg, Russian Federation, June 25, 2008.

  • A.G. Vladimirov, Mode-locking in monolithic semiconductor lasers, University College Cork, Tyndall National Institute, Ireland, March 12, 2008.

  • U. Bandelow, Dynamic simulation of high brightness semiconductor lasers, 8th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) 2008, September 1 - 5, 2008, University of Nottingham, UK, September 2, 2008.

  • U. Bandelow, Modeling and analysis of master-oscillator power-amplifier seminconductor lasers, University of Washington, Seattle, USA, October 16, 2008.

  • U. Bandelow, Modellierung und Simulation von Halbleiterlasern, Graduate College of the Collaborative Research Center SFB 787 ``Semiconductor Nanophotonics: Materials, Models, Devices'', May 21 - 23, 2008, Technische Universität Berlin, Institut für Festkörperphysik, Graal-Müritz, May 23, 2008.

  • U. Bandelow, Quantum-classical coupling in multi quantum well lasers, 4th Workshop ``Mathematical Models for Transport in Macroscopic and Mesoscopic Systems'', February 7 - 10, 2008, WIAS, Berlin, February 8, 2008.

  • M. Lichtner, Modeling and parallel simulation of high power semiconductor lasers, PARA 2008: Workshop on State-of-the-Art in Scientific and Parallel Computing, Minisymposium on Applications of Parallel Computation in Industry and Engineering, May 13 - 16, 2008, Trondheim, Norway, May 14, 2008.

  • M. Radziunas, U. Troppenz, J. Kreissl, Tailoring single-mode DFB laser with integrated passive feedback section for direct modulation applications, European Conference on Lasers and Electro-Optics, 2007/International Quantum Electronics Conference (CLEO-IQEC 2007), Munich, June 17 - 22, 2007.

  • M. Radziunas, Simulation and analysis of the multimode model for semiconductor ring lasers, PHASE Conference, Metz, France, March 28 - 30, 2007.

  • M. Radziunas, Tailoring a passive feedback DFB laser for direct modulation applications, PHASE Conference, March 28 - 30, 2007, Metz, France, March 29, 2007.

  • M. Radziunas, Traveling wave modeling of semiconductor ring lasers, Workshop on Nonlinear Dynamics in Semiconductor Lasers, November 19 - 21, 2007, WIAS, Berlin, November 20, 2007.

  • M. Radziunas, Travelling wave modelling of the semiconductor ring lasers, European Semiconductor Lasers Workshop (ESLW 2007), September 14 - 15, 2007, Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, Berlin, September 14, 2007.

  • S. Yanchuk, Eckhaus instability in systems with large delay, International Conference on Differential Equations (EQUADIFF 07), August 5 - 11, 2007, Vienna University of Technology, Austria, August 7, 2007.

  • M. Radziunas, Tailoring a passive feedback DFB laser for direct modulation applications, Heinrich-Hertz-Institut, Berlin, April 17, 2007.

  • U. Bandelow, 40 Gbit/s direct modulation in DFB lasers with integrated feedback, Workshop on Nonlinear Dynamics in Semiconductor Lasers, November 19 - 21, 2007, WIAS, Berlin, November 20, 2007.

  • U. Bandelow, Efficient modeling and analysis of dynamical effects in semiconductor laser devices, University of Nottingham, George Green Institute, UK, July 6, 2007.

  • U. Bandelow, Enhanced modulation bandwidth by integrated feedback, Rio de la Plata Workshop on Noise, Chaos and Complexity in Lasers and Nonlinear Optics, December 3 - 6, 2007, Punta del Este, Uruguay, December 5, 2007.

  • U. Bandelow, Feedback enhanced modulation bandwidth, Dynamics Days Europe, University of Loughborough, UK, July 12, 2007.

  • U. Bandelow, Nichtlineare Effekte in Halbleiterlasern und optischen Fasern, Habilitandenkolloquium, Humboldt-Universität zu Berlin, Institut für Physik, April 17, 2007.

  • U. Bandelow, Semiconductor laser instabilities and dynamics (Short Course SC 0702), 7th International Conference ``Numerical Simulation of Optoelectronic Devices'' (NUSOD'07), University of Delaware, Newark, USA, September 25, 2007.

  • M. Lichtner, Modeling and simulation of high power laser diodes, Workshop on Nonlinear Dynamics in Semiconductor Lasers, November 19 - 21, 2007, WIAS, Berlin, November 20, 2007.

  • A. Vladimirov, Numerical bifurcation analysis of a mode-locked semiconductor laser, Workshop on Nonlinear Dynamics in Semiconductor Lasers, November 19 - 21, 2007, WIAS, Berlin, November 21, 2007.

  • A. Vladimirov, Passive mode-locking in quantum dot lasers, Joint Seminar on Quantum Optics, St. Petersburg State University and Herzen State Pedagogical University, Russian Federation, December 26, 2007.

  • M. Radziunas, T. Köhler, ttfamily LDSL-tool: Simulation and analysis of dynamics in semiconductor lasers, Laser-Optik-Berlin, March 23 - 24, 2006.

  • M. Radziunas, Agreement between cavity modes in traveling wave and Lang--Kobayashi models of laser with delayed feedback, Cross-disciplinary Physics Seminar, Mediterranean Institute for Advanced Studies (IMEDEA), Palma de Mallorca, Spain, May 9, 2006.

  • M. Radziunas, External cavity modes in Lang-Kobayashi and traveling wave models, SPIE Conference Photonic Europe 2006, April 2 - 7, 2006, Strasbourg, France, April 5, 2006.

  • M. Radziunas, Reduction and numerical bifurcation analysis of a PDE model for multisection lasers, 6th Crimean School and Workshops ``Nonlinear Dynamics, Chaos and Applications'', May 15 - 26, 2006, Yalta, Crimea, Ukraine, May 22, 2006.

  • M. Radziunas, Simulation and analysis of the Traveling Wave model for multisection semiconductor lasers with LDSL-tool, WIAS-Day, Berlin, February 24, 2006.

  • M. Radziunas, Stabilization of orbits in semiconductor laser with external resonator, Workshop ``Complex Dynamics and Delay Effects in Coupled Systems'', September 11 - 13, 2006, Humboldt-Universität zu Berlin, September 12, 2006.

  • M. Radziunas, Traveling wave modeling of mode-locking in ring lasers, Workshop ``Nonlinear Dynamics in Modelocked Lasers and Optical Fibers'', July 13 - 14, 2006, WIAS, Berlin, July 14, 2006.

  • M. Lichtner, M. Radziunas, L. Recke, M. Wolfrum, Nonlinear dynamical effects in integrated optoelectronic structures, Evaluation Colloquium of the DFG Research Center sc Matheon, Berlin, January 24 - 25, 2006.

  • U. Bandelow, Modeling and simulation of optoelectronic devices, Kick-off Workshop ``Materials in New Light'', Humboldt-Universität zu Berlin, Institut für Physik, Berlin, January 6, 2006.

  • U. Bandelow, Modellierung und Simulation optoelektronischer Bauelemente, Berliner Industriegespräche, Deutsche Physikalische Gesellschaft, Magnus-Haus, Berlin, September 6, 2006.

  • U. Bandelow, Modellierung und Simulation von Pulsquellen, Status Seminar TerabitOptics Berlin, Heinrich-Hertz-Institut für Nachrichtentechnik, Berlin, July 4, 2006.

  • U. Bandelow, Multi-dimensional modeling and simulation of VCSELs, Project Meeting ''SFB Nanophotonics'', Technische Universität Berlin, September 1, 2006.

  • U. Bandelow, Simulation and analysis of spatio-temporal effects in complex laser structures, Kick-off Workshop ``Materials in New Light'', Humboldt-Universität zu Berlin, Institut für Physik, Berlin, January 6, 2006.

  • A. Glitzky, R. Nürnberg, U. Bandelow, ttfamily WIAS-TeSCA: Simulation of semiconductor lasers, Laser-Optik-Berlin, March 23 - 24, 2006.

  • M. Lichtner, A spectral gap mapping theorem and smooth invariant center manifolds for semilinear hyperbolic systems, 6th AIMS International Conference on Dynamical Systems, Differential Equations & Applications, June 25 - 28, 2006, Université de Poitiers, France, June 28, 2006.

  • A. Vladimirov, Dynamics of light pulses in mode-locked lasers, 6th Crimean School and Workshops ``Nonlinear Dynamics, Chaos and Applications'', May 15 - 26, 2006, Yalta, Crimea, Ukraine, May 20, 2006.

  • A. Vladimirov, Nonlinear dynamics and bifurcations in multimode and spatially distributed laser systems, June 20 - 23, 2006, St. Petersburg State University, Russian Federation, June 20, 2006.

  • A. Vladimirov, Nonlinear dynamics in multimode and spatially extended laser systems, Moscow State University, Physics Faculty, Russian Federation, November 10, 2006.

  • M. Radziunas, H.-J. Wünsche, V. Tronciu, Stability of continuous wave states in semiconductor laser with external resonator, Workshop on PHysics and Applications of SEmiconductor Lasers (PHASE 2005), Supélec --- Ecole Supérieure d'Electricité, Metz, France, March 29 - 30, 2005.

  • M. Radziunas, H.-J. Wünsche, Traveling-wave modeling of semiconductor lasers and amplifiers, 5th International Conference ``Numerical Simulation of Optoelectronic Devices'' (NUSOD 05), September 19 - 22, 2005, Humboldt-Universität, Berlin, September 19, 2005.

  • M. Radziunas, U. Bandelow, M. Wolfrum, A. Glitzky, R. Hünlich, U. Troppenz, J. Kreissl, Design of multisection semiconductor laser for 40 Gb/s direct modulation, 31st European Conference on Optical Communication ECOC 2005, Glasgow, UK, September 25 - 29, 2005.

  • M. Radziunas, Numerical bifurcation analysis of the traveling wave model of multisection semiconductor lasers, Workshop ``Qualitative Numerical Analysis of High-dimensional Nonlinear Systems'', March 21 - 24, 2005, University of Bristol, UK, March 23, 2005.

  • M. Radziunas, Reduction and numerical bifurcation analysis of the PDE model of multisection semiconductor lasers, Matheon Workshop on Model Reduction, Technische Universität, Berlin, November 7, 2005.

  • M. Radziunas, Simulation and analysis of the Traveling Wave model for multisection semiconductor lasers, Workshop ``Nonlinear Dynamics in Photonics'', May 2 - 4, 2005, WIAS, Berlin, May 4, 2005.

  • M. Radziunas, Stability of continuous wave states in semiconductor laser with external resonator, Minisymposium ``Laser + Resonator'', WIAS, Berlin, February 17, 2005.

  • M. Radziunas, Tailoring the dynamics of multisection lasers for 40 Gb/s direct modulation, 5th International Conference ``Numerical Simulation of Optoelectronic Devices'' (NUSOD 05), September 19 - 22, 2005, Humboldt-Universität, Berlin, September 20, 2005.

  • M. Radziunas, Tailoring the dynamics of multisection lasers for 40 Gb/s direct modulation, Evaluation of DIMOLA-Project, Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, Berlin, May 18, 2005.

  • M. Radziunas, Tayloring the dynamics of multisection semiconductor lasers for 40 Gbit/s direct modulation, European Semiconductor Laser Workshop (ESLW) 2005, September 23 - 24, 2005, Glasgow, UK, September 24, 2005.

  • A. Vladimirov, D. Turaev, D. Rachinskii, Delay differential models of mode-locking in semiconductor lasers, International Conference on Coherent and Nonlinear Optics, May 11 - 16, 2005, St. Petersburg, Russian Federation, May 14, 2005.

  • A. Vladimirov, 40 GHz modelocking in monolithic semiconductor lasers, WIAS-Day, Berlin, February 23, 2005.

  • A. Vladimirov, Theoretical analysis of dynamical instabilities in a mode-locked semiconductor laser, Workshop ``Nonlinear Dynamics in Photonics'', May 2 - 4, 2005, WIAS, Berlin, May 3, 2005.

  • S. Yanchuk, Appearance of patterns in delay coupled laser arrays, Universität Potsdam, January 31, 2005.

  • S. Yanchuk, Properties of the Lang-Kobayashi model with large delay, Workshop ``Nonlinear Dynamics in Photonics'', May 2 - 4, 2005, WIAS, Berlin, May 2, 2005.

  • M. Nizette, A. Vladimirov, M. Wolfrum, D. Rachinskii, Delay differential equations for passive mode-locking, International Quantum Electronics Conference, München, June 12 - 17, 2005.

  • U. Bandelow, Analyse dynamischer Effekte in Optoelektronik und Photonik, Institutsseminar, Ferdinand-Braun-Institut für Höchstfrequenztechnik, Berlin, December 9, 2005.

  • U. Bandelow, Modellierung und Simulation von Pulsquellen, Status Seminar of the Terabit-Optics-Berlin Project, Fraunhofer Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, Berlin, May 31, 2005.

  • U. Bandelow, Reduced amplitude noise in monolithic mode-locked semiconductor lasers, Workshop on PHysics and Applications of SEmiconductor Lasers (PHASE 2005), March 29 - 30, 2005, Supélec --- Ecole Supérieure d'Electricité, Metz, France, March 30, 2005.

  • M. Wolfrum, Synchronous and asynchronous instabilities of two lasers with a long delayed coupling, EUROMECH Nonlinear Dynamics Conference (ENOC 2005), August 7 - 12, 2005, Eindhoven, Netherlands, August 8, 2005.

  • M. Radziunas, Forced locking in multimode semiconductor lasers, WIAS Workshop ``Synchronization and High-dimensional Chaos in Coupled Systems'', November 15 - 16, 2004, Berlin, November 16, 2004.

  • M. Radziunas, Simulation and analysis of 40 GHz monolithic mode-locked lasers, Joint International Workshop OPTIMIST, EPIC and COST288, October 17 - 20, 2004, Università ``La Sapienza'', Rome, Italy, October 20, 2004.

  • S. Yanchuk, Dynamics of two F2F coupled lasers: Instantaneous coupling limit, SPIE Photonics Europe 2004 Conference ``Semiconductor Lasers and Laser Dynamics'', April 27 - 30, 2004, Strasbourg, France, April 28, 2004.

  • S. Yanchuk, Intermittent synchronization in a system of coupled lasers, WIAS Workshop ``Synchronization and High-dimensional Chaos in Coupled Systems'', November 15 - 16, 2004, Berlin, November 15, 2004.

  • U. Bandelow, M. Radziunas, Time domain simulation of 40 GHz mode-locked semiconductor lasers, WIAS Mini-Symposium on Mode-locked Semiconductor Lasers, March 22 - 23, 2004, Berlin, March 22, 2004.

  • U. Bandelow, 40 GHz mode-locked semiconductor lasers: Theory, simulation and experiments, Annual Meeting 2004 of the Optical Society of America (OSA) ``Frontiers in Optics'', October 10 - 14, 2004, Rochester, USA, October 11, 2004.

  • U. Bandelow, Modeling of 40 GHz mode-locked semiconductor lasers, European Semiconductor Laser Workshop (ESLW'04), September 2 - 4, 2004, Chalmers University of Technology, Department of Microtechnology and Nanoscience, Särö, Sweden, September 4, 2004.

  • U. Bandelow, Modellierung und Simulation von Pulsquellen, Status Seminar of the Terabit-Optics-Berlin Project, Technische Universität Berlin, May 3, 2004.

  • U. Bandelow, Modellierung und Simulation von Pulsquellen, Status Seminar of the Terabit-Optics-Berlin Project, Technische Universität Berlin, November 2, 2004.

  • U. Bandelow, Time-domain modeling of ps-OEIC, Joint International Workshops OPTIMIST, EPIC and COST288, June 2 - 4, 2004, Athens, Greece, June 3, 2004.

  • A.G. Vladimirov, D. Turaev, G. Kozyrev, Delay differential equations for a passively mode-locked laser, EPS-QEOD Europhoton Conference on Solid State and Fiber Coherent Light Sources, August 29 - September 3, 2004, European Physical Society, Lausanne, Switzerland, August 31, 2004.

  • A.G. Vladimirov, DDE-based modelling of passively mode-locked 40 GHz semiconductor lasers, WIAS Mini-Symposium on Mode-locked Semiconductor Lasers, March 22 - 23, 2004, Berlin, March 22, 2004.

  • U. Bandelow, M. Radziunas, Simulation of mode-locked lasers with LDSL-tool, European Quantum Electronics Conference (EQEC 2003), June 23 - 27, 2003, München, June 26, 2003.

  • U. Bandelow, Modeling and simulation of mode-locked lasers, WIAS Minisymposium on Pulse Generation in Laser Diodes, Berlin, June 12, 2003.

  • U. Bandelow, Report on WIAS activities concerning COST Action 288, Kick-off Meeting for the Cost Action 288, COST TIST Secretariat, Brussels, Belgium, April 7, 2003.

  • U. Bandelow, Simulation of 40 GHz mode-locked multisection DBR lasers, European Semiconductor Laser Workshop (ESLW'03), September 19 - 20, 2003, Torino, Italy, September 20, 2003.

  • U. Bandelow, Simulation of mode-locked lasers based on a distributed time-domain model, WIAS Workshop ``Dynamics of Semiconductor Lasers'', September 15 - 17, 2003, Berlin, September 17, 2003.

  • U. Bandelow, Thermodynamic designed energy model, 3rd Topical meeting on Numerical Simulation of Semiconductor Optoelectronic Devices (NUSOD'03), October 14 - 16, 2003, University of Tokyo, Japan, October 14, 2003.

  • M. Radziunas, Computation of the stationary states of traveling wave laser model and their analysis, WIAS Workshop ``Multiscale Systems and Applications'', April 3 - 5, 2003, Berlin, April 5, 2003.

  • M. Radziunas, Dynamics of longitudinal modes in multisection semiconductor lasers, WIAS Workshop ``Dynamics of Semiconductor Lasers'', September 15 - 17, 2003, Berlin, September 15, 2003.

  • M. Radziunas, Forced periodic frequency locking: Application of path-following tools, WIAS Workshop ``Dynamical Systems, Synchronization, Lasers'', February 26 - 27, 2003, Berlin, February 27, 2003.

  • M. Radziunas, Numerical bifurcation analysis of the PDE system describing dynamics in multi-section semiconductor laser, The European Conference on Numerical Mathematics and Advanced Applications (ENUMATH 2003), August 18 - 22, 2003, Prague, Czech Republic, August 21, 2003.

  • S. Bauer, O. Brox, M. Biletzke, J. Kreissl, M. Radziunas, B. Sartorius, H.-J. Wünsche, Speed potential of active feedback lasers, CLEO/Europe-EQEC 2003, München, July 22 - 27, 2003.

  • M. Lichtner, M. Radziunas, L. Recke, J. Rehberg, K.R. Schneider, D8 -- Nichtlineare dynamische Effekte in integrierten optoelektronischen Strukturen, MathInside---Überall ist Mathematik, event of the DFG Research Center ``Mathematics for Key Technologies'' on the occasion of the Open Day of Urania, Berlin, September 13, 2003 - September 27, 2000.

  • K.R. Schneider, Bifurcation in mode approximation models of semiconductor lasers, Grodno State University, Faculty of Mathematics, Belarus, December 3, 2003.

  • K.R. Schneider, Modeling of the longitudinal dynamics of semiconductor lasers, 8th International Conference ``Mathematical Modelling and Analysis 2003'' (MMA), ECMI, May 28 - 31, 2003, Vilnius, Lithuania, May 29, 2003.

  • A. Vladimirov, A new DDE model for passive mode-locking, WIAS Workshop ``Dynamics of Semiconductor Lasers'', September 15 - 17, 2003, Berlin, September 17, 2003.

  • A. Vladimirov, Passive mode-locking in semiconductor lasers, Institute for Laser Physics, St. Petersburg, Russian Federation, December 25, 2003.

  • M. Wolfrum, Instabilities of semiconductor lasers with delayed optical feedback, Workshop ``Delay Equations and Applications'', September 8 - 11, 2003, Bristol, UK, September 10, 2003.

  • S. Yanchuk, Synchronization of two mutually coupled semiconductor lasers: Instantaneous coupling limit, WIAS Workshop ``Dynamics of Semiconductor Lasers'', September 15 - 17, 2003, Berlin, September 16, 2003.

  • S. Yanchuk, Synchronization phenomena in semiconductor laser, Sfb 555 Workshop ``Complex Nonlinear Processes'', September 11 - 13, 2003, Berlin, September 12, 2003.

  • S. Yanchuk, Synchronization of two coupled Lang-Kobayashi systems, National Institute of Applied Optics, Florence, Italy, May 7, 2003.

  • S. Yanchuk, Synchronization problem in two-section semiconductor lasers, Forschungsseminar ``Angewandte Analysis'', Humboldt-Universität zu Berlin, Institut für Mathematik, July 7, 2003.

  • M. Radziunas, Analysis and simulation of active feedback lasers, Minisymposium ``DFB Laser with Amplifying Feedback'', WIAS, Berlin, November 28, 2002.

  • M. Radziunas, Dynamics of multi-section DFB semiconductor laser: Traveling wave and mode approximation models, Physics and Simulation of Optoelectronics Devices X, January 21 - 25, 2002, San Jose, California, USA, January 21, 2002.

  • M. Radziunas, Excitability of a DFB laser with short external cavity, Physics and Simulation of Optoelectronics Devices X, San Jose, California, USA, January 24, 2002.

  • M. Radziunas, LDSL: A tool for simulation and analysis of longitudinal dynamics in multisection semiconductor lasers, International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices (NUSOD-02), September 25 - 27, 2002, Eidgenössische Technische Hochschule Zürich, Switzerland, September 25, 2002.

  • M. Radziunas, Numerical bifurcation analysis of PDE system describing dynamics in multi-section semiconductor laser, Dynamical Methods for Differential Equations, September 4 - 7, 2002, Medina del Campo, Spain, September 6, 2002.

  • M. Radziunas, Simulation and analysis of dynamics in multi-section semiconductor DFB laser, First SIAM-EMS Conference ``Applied Mathematics in our Changing World'', September 3 - 6, 2001, Berlin, September 3, 2001.

  • M. Radziunas, Traveling wave model and its mode approximations analyzing and designing semiconductor lasers, WIAS Workshop ``Dynamics of Semiconductor Lasers'', September 13 - 15, 2001, Berlin, September 14, 2001.

  • H. Gajewski, U. Bandelow, H. Stephan, K.R. Schneider, M. Radziunas, M. Wolfrum, J. Sieber, F. Jochmann, L. Recke, Modellierung von Halbleiterlasern --- Strukturbildung in Raum und Zeit, Evaluation of Sfb 555 ``Complex Nonlinear Processes'', Humboldt-Universität zu Berlin, April 5, 2001 - September 27, 2000.

  • M. Radziunas, K.R. Schneider, Tayloring of semiconductor lasers for optical communicator networks, 3rd International Symposium "`Investigation of Nonlinear Dynamic Effects in Production Systems"', Brandenburgische Technische Universität Cottbus, September 26 - 27, 2000.

  • M. Radziunas, Modelling of multisection semiconductor lasers, International Colloquium "`Applications of Mathematics"', September 29 - 30, 2000, Hamburg, September 29, 2000.

  External Preprints

  • M. Schulz-Ruhtenberg, I. Babushkin, N.A. Loiko, K.F. Huang, T. Ackemann, Polarization properties in the transition from below to above lasing threshold in broad-area vertical-cavity surface-emitting lasers (electronic only), Preprint no. arXiv:0909.3812, Cornell University Library, arXiv.org, 2009.
    Abstract
    For highly divergent emission of broad-area vertical-cavity surface-emitting lasers (VCSELs) a rotation of the polarization direction by up to 90 degrees occurs when the pump rate approaches the lasing threshold. Well below threshold the polarization is parallel to the direction of the transverse wave vector and is determined by the transmissive properties of the Bragg reflectors that form the cavity mirrors. In contrast, near-threshold and above-threshold emission is more affected by the reflective properties of the reflectors and is predominantly perpendicular to the direction of transverse wave vectors. Two qualitatively different types of polarization transition are demonstrated: an abrupt transition, where the light polarization vanishes at the point of the transition, and a smooth one, where it is significantly nonzero during the transition.

  • I. Babushkin, Scar-like structures and non-integrability in a perfectly square optical billiard (electronic only), Preprint no. arXiv:0909.4330, Cornell University Library, arXiv.org, 2009.
    Abstract
    We show that scar-like structures (SLS) in a wide aperture vertical cavity surface emitting laser (VCSEL) can be formed even in a perfectly square geometry due to interaction of polarization and spatial degrees of freedom of light. We show also that dissipation in the system induces an order among the cavity modes, so that SLS become preferred at lasing threshold. More generally, modes which are more localized both in coordinate and momentum space have in average lower losses.