Suppressing filamentation instability due to laser beam self-filtering  

作　　者：Dmitry Silin Efim Khazanov 

机构地区：[1]A.V.Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences,Nizhny Novgorod,Russia

出　　处：《High Power Laser Science and Engineering》2024年第3期51-61,共11页高功率激光科学与工程（英文版）

基　　金：supported by the Ministry of Science and Higher Education of the Russian Federation(075-15-2020906,Center of Excellence‘Center of Photonics’)。

摘　　要：The development of small-scale self-focusing in a nonlinear Kerr medium after preliminary self-filtering of a laser beam propagating in free space is studied numerically.It is shown that,under definite conditions,due to self-filtering,filamentation instability(beam splitting into filaments)either occurs at significantly larger values of the B-integral,or does not occur at all.In the latter case,there develops the honeycomb instability revealed in this work.This instability is the formation of a random honeycomb structure in the beam cross-section.It is shown that self-filtering can significantly increase the permissible values of the B-integral,at which the beam quality remains acceptable.

关 键 词：filamentation instability honeycomb instability self-filtering small-scale self-focusing 

分 类 号：TN249[电子电信—物理电子学]