Abstract

High-power femtosecond laser pulses undergo large-scale transformations during filamentation in a nonlinear medium. Spatial transformations result in the formation of the post-filamentation channels—intense spatially localized light structures observed in the laser beam at the plasma-free stage of pulse propagation. We present the experimental results on the main characteristics of post-filamentation channels formed by the filamentation of Ti:sapphire laser pulses (744 nm, 90 fs) in air. Angular divergence, spectral composition, power, and temporal parameters of post-filamentation channels at different initial pulse energy are investigated. We study a specific cascade pulse filamentation regime when the post-filamentation channel is initially formed in air and then experiences recurrent filamentation in a condensed medium (fused silica).

© 2019 Optical Society of America

Self-channeling of spatially modulated femtosecond laser beams in the post-filamentation region

Yury Geints, Olga Minina, and Alexander Zemlyanov
J. Opt. Soc. Am. B 39(6) 1549-1556 (2022)

Diffraction-ray tube analysis of ultrashort high-intensity laser pulse filamentation in air

Yury Geints, Olga Minina, and Alexander Zemlyanov
J. Opt. Soc. Am. B 36(11) 3209-3217 (2019)

Experimental study of high-intensity light channels produced on an extended air path by phase and amplitude modulated femtosecond laser pulses

D. V. Apeksimov, Yu. E. Geints, G. G. Matvienko, V. K. Oshlakov, and A. A. Zemlyanov
Appl. Opt. 61(6) 1300-1306 (2022)

Statistical parameters of femtosecond laser pulse post-filament propagation on a 65 m air path with localized optical turbulence

Dmitry V. Apeksimov, Andrey V. Bulygin, Yury E. Geints, Andrey M. Kabanov, Elena E. Khoroshaeva, Aleksey V. Petrov, and Victor K. Oshlakov
J. Opt. Soc. Am. B 39(12) 3237-3246 (2022)

Range of multiple filamentation of a terawatt-power large-aperture KrF laser beam in atmospheric air

Vladimir Zvorykin, Andrey Ionin, Daria Mokrousova, Leonid Seleznev, Igor’ Smetanin, Elena Sunchugasheva, Nikolai Ustinovskii, and Alexey Shutov
J. Opt. Soc. Am. B 36(10) G25-G32 (2019)