Optimization of a femtosecond pulse self-compression region along a filament in air |
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| Authors: | OG Kosareva NA Panov DS Uryupina MV Kurilova AV Mazhorova AB Savel’ev RV Volkov VP Kandidov SL Chin |
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| Institution: | (1) International Laser Center, Physics Department, M.V. Lomonosov Moscow State University, Moscow, 119991, Russia;(2) FSUE “SPA Astrophysica”, 95, Volokolamskoe sh., Moscow, 125424, Russia;(3) Centre d’Optique, Photonique et Laser (COPL) and Département de Physique, de Génie Physique et d’Optique, Université Laval, Québec, Québec, G1K 7P4, Canada |
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| Abstract: | We have identified the pulse self-compression region in a filament produced by 55 fs, 4 mJ, 805 nm radiation propagating in
air without geometrical focusing. In our experiment the pulse self-compression region is attained by the propagation distance,
where the shortest wavelength in the supercontinuum blue wing reaches a minimum, and the growing conversion efficiency to
white light has a large gradient. Numerical tracking of the pulse along the filament shows a single-peak 9 fs pulse with a
flat spectral phase at the optimum compression distance.
PACS 42.65.Jx; 42.65.Re; 42.65.Ky |
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