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DFG grant BR 4654/1:
ab-initio description of optical nonlinearities in femtosecond filaments
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A femtosecond filament in an argon filled gas cell ingnited by a 45fs, 1mJ laser pulse

Researchers:

Project Head: Dr. Carsten Brée ,
Investigators: Dipl. Phys. Michael Hofmann

Description:

This project aims at a deepened understanding of light-matter interaction in femtosecond filaments. Since optical pulses in filaments can achieve electric fields strengths comparable to atomic ones, non-perturbative models like the time dependent Schrödinger equation and time dependent density functional theory have to be employed. Using these methods, our main objective is an accurate description of light-matter interaction (LMI) at non-perturbative intensity levels, eventually leading to the development of an extendend phenomenological model of LMI in filaments.

Publications

Refereed publications

  1. Hofmann, Michael; Hyyti, Janne; Birkholz, Simon; Bock, Martin; Das, Susanta K.; Grunwald, Rüdiger; Hoffmann, Mathias; Nagy, Tamas; Demircan, Ayhan; Jupé, Marco; Ristau, Detlev; Morgner, Uwe; Brée, Carsten; Wörner, Michael; Elsaesser, Thomas; Steinmeyer, Günter
    "Non-instantaneous polarization dynamics in dielectric media",
    Optica 2, 151-157(2015)
  2. Hofmann, Michael; Brée, Carsten
    "Femtosecond filamentation by intensity clamping at a Freeman resonance",
    Physical Review A 92, 013813(2015)
  3. Hofmann, Michael; Brée, Carsten
    "Adiabatic Floquet model for the optical response in femtosecond filaments",
    Journal of Physics B: Atomic, Molecular and Optical Physics 49, 205004(2016)

Preprints

  1. 1961: Hofmann, Michael; Hyyti, Janne; Birkholz, Simon; Bock, Martin; Das, Susanta K.; Grunwald, Rüdiger; Hoffmann, Mathias; Nagy, Tamas; Demircan, Ayhan; Jupé, Marco; Ristau, Detlev; Morgner, Uwe; Brée, Carsten; Wörner, Michael; Elsaesser, Thomas; Steinmeyer, Günter
    "Non-instantaneous polarization response in dielectric media",
    WIAS Preprint 1961, WIAS, Berlin, 2014.
  2. 2051: Hofmann, Michael; Brée, Carsten
    "Femtosecond filamentation by intensity clamping at a Freeman resonance",
    WIAS Preprint 2051, WIAS, Berlin, 2014.
  3. 2217: Hofmann, Michael; Brée, Carsten
    "Adiabatic Floquet model for the optical response in femtosecond filaments",
    WIAS Preprint 2217, WIAS, Berlin, 2016.

Invited talks

  1. C. Brée, M. Hofmann
    "Probing the transient response of atomic hydrogen"
    Group seminar, Humboldt University Berlin, Institute of Physics, AG Modern Optics, November 4, 2013
  2. C. Brée, M. Hofmann,
    "Intense laser matter interactions in atomic gases and crystalline solids",
    Group seminar, Leibniz University Hannover, Institute of Quantum Optics, February 27, 2014
  3. C. Brée, M. Hofmann,
    "On the transient susceptibility of atoms in strong laser fields",
    Group seminar, Humboldt University Berlin, Institute of Mathematics, Research group Dynamics and synchronization of complex systems, June 2, 2014
  4. C. Brée
    "Impact of Resonance-Enhanced Ionization on Femtosecond Filamentation", International Workshop "Nonlinear Photonics: Theory, Materials, Applications",
    Saint Petersburg, July 2, 2015
  5. C. Brée, M. Hofmann,
    "A Model of Intense Laser-Matter Interaction Based on Complex-Rotated Floquet Resonances",
    LPHYS15, 24. Annual International Laser Physics Workshop,
    Shanghai, August 23, 2015

Contributed Talks

  1. M. Hofmann,
    "On the transient optical response of atomic gases",
    78. DPG-Jahrestagung und Frühjahrstagung der Sektion AMOP, March 20, 2014, Berlin
  2. M. Hofmann
    "Saturation of the Nonlinear Refractive Index Due to Resonantly Enhanced Ionization", International Workshop "Nonlinear Photonics: Theory, Materials, Applications",
    Saint Petersburg, July 2, 2015
  3. M. Hofmann,
    "On the Role of Freeman Resonances in Pump-Probe Measurements of the Nonlinear Refractive Index",
    CLEO: Science and Innovations 2015, San Jose, May 10-15,2015
  4. M. Hofmann,
    "Intensity Clamping at a Freeman Resonance",
    European Quantum Electronics Conference 2015, Munich, June 21-25,2015
  5. M. Hofmann,
    "Nonlinear Refractive Index in Filaments Governed by Resonantly Enhanced Ionization",
    LPHYS15, 24. Annual International Laser Physics Workshop, August 24, 2015

Poster

  1. Carsten Brée, Martin Kretschmar, Tamas Nagy, Michael Hofmann, Ayhan Demircan, Uwe Morgner, and Milutin Kovacev,
    "Fingerprint of Self-Compression in the High Harmonic Spectrum from a Filament",
    Laser Optics Berlin, HILAS, March 19, 2014.
    Research in Optical Sciences , OSA Technical Digest (online) (Optical Society of America, 2014), paper JW2A.7.
  2. M. Hofmann; C. Brée,
    "On the Role of Freeman Resonances in Pump-Probe Measurements of the Nonlinear Refractive Index",
    CLEO/Europe-EQEC 2015
    June 24, 2015

Thesis

    M. Hofmann,
    "Einfluss dynamischer Resonanzen auf die Wechselwirkung optischer Femtosekunden-Pulse mit transparenten Dielektrika",
    Supervisor: Andreas Knorr
    Technische Universität Berlin, 2016

Collaborations:

Last modified: Th 02 March 2017 CET 11.51 Carsten Brée