Suppressing filamentation instability due to laser beam self-filtering

作     者：Dmitry Silin Efim Khazanov 

作者机构：A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences 

出 版 物：《High Power Laser Science and Engineering》 (高功率激光科学与工程)

年 卷 期：2024年第3期

页      面：56-66页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 

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.