Propagation regimes of the millimeter laser beams in a Kerr-nonlinear turbulent medium
A.A. Zemlyanov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: laser radiation, self-focusing, self-channeling, Kerr-nonlinear medium, turbulence
Abstract
The article presents the results of a study of the problem of propagation regimes of narrow (millimeter) laser beams in a Kerr-nonlinear turbulent medium, which is a model of evolution of the light inhomogeneities generated at multiple filamentation of high-power laser pulses in the corresponding media. We used methods of diffraction beam tubes and diffraction beams in the theoretical study. It was found that there are three propagation regimes for laser beams with certain parameters in a turbulent medium: self-focusing with generation of a nonlinear focus (beam collapse), self-channeling over a limited distance, and turbulent propagation. An analytical relationship for the square of the beam's effective radius was derived, which is of interest for practical applications in nonlinear atmospheric optics.
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