Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 28: Attosecond physics II
A 28.4: Vortrag
Mittwoch, 16. März 2011, 11:30–11:45, BAR 205
Spectral reshaping of pulses propagating within a filament — •Emilia Schulz1, Daniel S. Steingrube1, Thomas Binhammer2, Mette B. Gaarde3, Arnaud Couairon4, Uwe Morgner1, and Milutin Kovacev1 — 1Leibniz Universität Hannover, Welfengarten 1 D-30167 Hannover, Germany; QUEST, Centre for Quantum Engineering and Space-Time Research, Hannover, Germany — 2VENTEON Laser Technologies GmbH, D-30827 Garbsen, Germany — 3Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USA; PULSE Insti- tute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA — 4Centre de Physique Theorique, Ecole Polytechnique, CNRS, F-91128, Palaiseau, France
Filamentation of ultra-short laser pulses has become a versatile tool for ultra-fast applications as e.g. few-cycle-pulse generation. The complex spatio-temporal dynamics taking place during the filamentation process are so far only predicted from numerical simulations, and only a few efforts have been done in the experimental investigation of the evolution of propagating pulses within a filament. We present a cell design which is capable to realize a pressure gradient from 1000 mbar argon to a vacuum pressure of below 10−4 mbar over a distance of about 1 cm. This enables the investigation of filaments along their propagation direction. Self focusing and spectral broadening of the pulse during the filamentation process can now be investigated in detail. We present experimental results showing the influence of pressure and chirp on the spectral broadening. Numerical calculations show excellent agreement.