Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 24: Interaction with strong or short laser pulses I
A 24.7: Talk
Wednesday, March 2, 2016, 12:30–12:45, f303
Spatio-temporal dynamics along a femtosecond filament — •Martin Kretschmar1, Carsten Bree2, Tamas Nagy1,3, Heiko Kurz1, Uwe Morgner1, and Milutin Kovacev1 — 1Leibniz Universität Hannover, Institut für Quantenoptik, Hannover — 2Weierstrass-Institut für angewandte Analysis und Stochastik, Berlin — 3Laser-Laboratorium Göttingen, Göttingen
Filaments occur as the nonlinear balance between self-focusing due to the Kerr-effect and defocusing due to free electrons generated by ionizing the surrounding medium. As a result, complex spatio-temporal dynamics take place during the filamentation process, which strongly influence the propagating pulse. We report on the direct observation of pulse dynamics along the filament and its connection to directly emitted high-order harmonic radiation. The nonlinear nature of the high-harmonic generation process is used to gain further insight into the fundamental pulses propagation dynamics. Theoretical modeling of the fundamental pulse propagation confirms our experimental observations and gives further insight into the nonlinear dynamics occurring along a filament.