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3D Raman bullet formed under filamentation of femtosecond laser pulses in air and nitrogen |
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| Authors: | Daria Uryupina Nikolay Panov Maria Kurilova Anna Mazhorova Roman Volkov Stepan Gorgutsa Olga Kosareva Andrei Savel’ev |
| Affiliation: | 1. International Laser Center and Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, Moscow, 11991, Russia 2. école Polytechnique de Montréal, Génie Physique, Montreal, QC, H3C 3A7, Canada 3. Institut National de la Recherche Scientifique-EMT, Varennes, QC, J3X 1S2, Canada |
| Abstract: | Complex experimental study of spectral, spatial and temporal behaviors of the IR shifted component observed under filamentation of the collimated femtosecond laser beam (80 GW, 50 fs, 805 nm) in molecular gases showed that this component behaves like a Raman soliton. Namely, it is confined in all domains: (a) it propagates within the filament core, (b) it has a stable duration of 30 fs along the filament, and (c) its spectrum shifts as a whole from 820 to 870 nm on the distance of 2 m from the filament start. A simple model explaining the origin of anomalous group velocity dispersion in the plasma channel of a filament is suggested. |
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