INFLUENCE OF TRANSIENT SELF-DEFOCUSING ON THE PROPAGATION OF HIGH-POWER FEMTOSECOND LASER-PULSES IN GASES UNDER IONIZATION CONDITIONS

Authors
KANDIDOV VP KOSAREVA OG SHLENOV SA
Citation
Vp. Kandidov et al., INFLUENCE OF TRANSIENT SELF-DEFOCUSING ON THE PROPAGATION OF HIGH-POWER FEMTOSECOND LASER-PULSES IN GASES UNDER IONIZATION CONDITIONS, Kvantovaa elektronika, 21(10), 1994, pp. 971-977
Citations number
18
Categorie Soggetti
Physics, Applied","Engineering, Eletrical & Electronic
Journal title
Kvantovaa elektronika → ACNP
ISSN journal
03687147
Volume
21
Issue
10
Year of publication
1994
Pages
971 - 977
Database
ISI
SICI code
0368-7147(1994)21:10<971:IOTSOT>2.0.ZU;2-C
Abstract
A transient three-dimensional model is used in a numerical investigati on of spatiotemporal and spectral characteristics of a femtosecond pul se of 10(14)-10(16) W/cm2 intensity propagating in rare gases. It is s hown that nonlinear defocusing caused by the ionisation of a gas may r esult in a 20-fold reduction of the peak intensity in the beam waist. The transverse distribution of the intensity beyond the waist is a rin g with a minimum on the beam axis at a pressure of 1 bar and with a lo cal maximum on the axis at 5 bar. The frequency spectra of such a puls e are in qualitative agreement with experimental data.