Hannover 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 13: Ultrashort Laser Pulses: Generation II
Q 13.3: Vortrag
Montag, 8. März 2010, 17:00–17:15, F 342
Propagation of ultrashort UV pulses in a nonlinear dispersive self-defocusing gas: A route to an effective compression scheme? — •Christian Koehler1, Luc Berge2, and Stefan Skupin1,3 — 1Max-Planck-Institute for the Physics of Complex Systems, 01187 Dresden, Germany — 2CEA-DAM, DIF, F-91297 Arpajon, France — 3Friedrich-Schiller-University, Institute of Condensed Matter Theory and Solid State Optics, 07743 Jena, Germany
Compression of UV femtosecond laser pulses in xenon gas is studied numerically. Due to temporal modulational instability (MI), occurring in the normal dispersion regime with large negative Kerr index, ∼100 fs pulses are compressed by a factor up to eight to singly peaked wave-forms with unchanged shape over meters of propagation range. A detailed discussion of the compression mechanism is given for the (1+1)-dimensional waveguided case and a combination of MI theory and variational techniques is used to identify suitable parameters for compression in bulk (3+1)-dimensional configuration. Furthermore, a comparison between models with and without dispersive nonlinearity exhibits qualitative agreement, leading to the conclusion that even in the case of strong nonlinear dispersion the classical NLS equation captures the basic physical ingredients for this self-compression mechanism. Since in bulk configuration these ultrashort structures naturally evolve without any guiding devices, our findings give rise to a very simple and effective compressor for ultrashort pulses in the UV range.