FILAMENTATION OF LASER PULSES AT HIGH GAS PRESSURE
Authors:
1.
Institut optiki atmosfery im. V.E. Zueva SO RAN
Russian Federation
Russian Federation
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
6.
Institut optiki atmosfery im. V.E. Zueva SO RAN
7.
Institut optiki atmosfery im. V.E. Zueva SO RAN
8.
Institut optiki atmosfery im. V.E. Zueva SO RAN
Type:
Сonference article
Published:
26.06.2025
Subject area:
VAK Russia 1.3
UDC 53
CSCSTI 29.00
Russian Classification of Professions by Education 03.04.02
Russian Library and Bibliographic Classification 22
Russian Trade and Bibliographic Classification 61
BISAK SCI053000 Physics / Optics & Light
UDC 53
CSCSTI 29.00
Russian Classification of Professions by Education 03.04.02
Russian Library and Bibliographic Classification 22
Russian Trade and Bibliographic Classification 61
BISAK SCI053000 Physics / Optics & Light
Language:
Russian
Keywords:
filamentation regime, laser beam, optical cell
Funding:
Issledovaniya vypolneny v ramkah granta RNF №24-12-00056.
Abstract (English):
The report presents the results of our studies of the effect of the pressure of a gas medium in an optical cell on the characteristics of femtosecond laser radiation propagating in the filamentation regime. It is shown that under conditions of high pressure and sharp geometric focusing of radiation, its Kerr self-focusing is realized, which transforms from the regime of single filamentation to the regime of generation of a multiple of intense filaments – post-filaments with gas pressure increasing. It has been defined for the first time that the pulse spectrum is asymmetrically widened mainly to the long-wavelength region with an increase of the sharpness of the initial beam focusing. In addition, as the gas pressure in the optical cell increases, the average size of the intense light post-filaments formed inside the beam decreases and may be fractions of a millimeter.
The report presents the results of our studies of the effect of the pressure of a gas medium in an optical cell on the characteristics of femtosecond laser radiation propagating in the filamentation regime. It is shown that under conditions of high pressure and sharp geometric focusing of radiation, its Kerr self-focusing is realized, which transforms from the regime of single filamentation to the regime of generation of a multiple of intense filaments – post-filaments with gas pressure increasing. It has been defined for the first time that the pulse spectrum is asymmetrically widened mainly to the long-wavelength region with an increase of the sharpness of the initial beam focusing. In addition, as the gas pressure in the optical cell increases, the average size of the intense light post-filaments formed inside the beam decreases and may be fractions of a millimeter.
Keywords:
filamentation regime, laser beam, optical cell
filamentation regime, laser beam, optical cell
1. P.A. Chizhov, V.V. Bukin, A.A. Ushakov, S.V. Garnov. Osobennosti dinamiki elektronnoy plotnosti pri filamentacii femtosekundnogo lazernogo izlucheniya v vozduhe pri povyshennom davlenii // Kvantovaya elektronika. 2016. T. 46, № 4.
2. Yu.E. Geints, S.S. Golik, A.A. Zemlyanov, A.M. Kabanov and A.V. Petrov. Microstructure of the multiple-filamentation zone formed by femtosecond laser radiation in a solid dielectric // Quantum electronics. 2016. V.46. Is. 2. P. 133-141.
