FILAMENTATION OF THE STOCHASTICALLY STRUCTURED FEMTOSECOND LASER PULSES IN A HIGH-PRESSURE GAS
Authors:
1.
Institut optiki atmosfery im. V.E. Zueva SO RAN
2.
Institut optiki atmosfery im. V.E. Zueva SO RAN
3.
Institut optiki atmosfery im. V.E. Zueva SO RAN
4.
Institut optiki atmosfery im. V.E. Zueva SO RAN
5.
Institut optiki atmosfery im. V.E. Zueva SO RAN
Type:
Сonference article
Pages:
from 394
to 397
Published:
17.08.2026
Subject area:
UDC 504.3
UDC 544.032.65
UDC 544.032.65
Language:
Russian
Keywords:
femtosecond laser pulses
Abstract:
The results of studies of propagation of the powerful femtosecond laser pulses in a high-pressure cell with preliminary structuring of the laser beam are presented. It was shown that a stochastically structured beam significantly tends to redistribute of laser energy into the high-intensity light channels compared to a beam with a Gaussian energy distribution in its cross-section. The number of such channels formed in the cell was measured as a function of pressure and pulse energy. There was compared such dependences for the cases in the cell and along an atmospheric path. It was shown that compared to a beam with a regular Gaussian profile, stochastic spatial modulation of laser radiation triggers earlier small-scale self-focusing of the beam and leads to more developed multiple filamentation when passing through the cell with a high-pressure gas.
The results of studies of propagation of the powerful femtosecond laser pulses in a high-pressure cell with preliminary structuring of the laser beam are presented. It was shown that a stochastically structured beam significantly tends to redistribute of laser energy into the high-intensity light channels compared to a beam with a Gaussian energy distribution in its cross-section. The number of such channels formed in the cell was measured as a function of pressure and pulse energy. There was compared such dependences for the cases in the cell and along an atmospheric path. It was shown that compared to a beam with a regular Gaussian profile, stochastic spatial modulation of laser radiation triggers earlier small-scale self-focusing of the beam and leads to more developed multiple filamentation when passing through the cell with a high-pressure gas.
Keywords:
femtosecond laser pulses
femtosecond laser pulses
1. P.A. Babushkin , A.D. Bulygin , Yu.E. Geints, A.M. Kabanov , V.K. Oshlakov , A.V. Petrov, E.E. Khoroshaeva Turbulence-enhanced THz generation by multiple chaotically-distributed femtosecond filaments in air // Optics and Laser Technology. V. 179. P. 111322. 2024.
2. Dmitry V. Apeksimov, Pavel A. Babushkin, Yury E. Geints, Andrey M. Kabanov, Elena E. Khoroshaeva, Victor K. Oshlakov, Alexey V. Petrov and Alexander A. Zemlyanov Postfilament-Induced Two-Photon Fluorescence of Dyed Liquid Aerosol Enhanced by Structured Femtosecond Laser Pulse // Atmosphere. 2024. 15(7). 6 Jul 2024 P. 2-12.
