Structured Filamentation of High-Power Femtosecond Laser Radiation Modulated by Amplitude Mesh Masks

Pub Date : 2024-07-03 DOI:10.1134/S1024856024700222
Yu. E. Geints, O. V. Minina
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Abstract

The problem of controlling the parameters of the filamentation region of high-power femtosecond laser pulses for amplitude modulation of radiation by a metal mesh mask is theoretically considered. In this case, the initial laser beam is split into individual lower energy subbeams. This leads to a pronounced regularization of the spatial structure of the filaments, which is formed at the stage of radiation self-focusing due to diffraction interaction between subbeams in a nonlinear medium. Using numerical simulation, it is found that the total length of the filamentation region of femtosecond laser radiation in air is reduced when using modulation meshes. At the same time, the longitudinal continuity of laser plasma in such filaments can significantly increase. It is shown that the spatial parameters of filaments (coordinate of the beginning, length, and continuity) can be controlled over a wide range by changing mesh parameters (crosshair thickness and cell size), as well as the position of the mesh mask relative to the laser beam center. The results are important for predicting the propagation of high-power femtosecond laser radiation in a nonlinear medium, in particular, along atmospheric paths.

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由振幅网罩调制的高功率飞秒激光辐射的结构化丝状化
摘要 从理论上探讨了如何控制高功率飞秒激光脉冲的丝化区参数,以便通过金属网掩模对辐射进行调幅。在这种情况下,初始激光束被分割成单个能量较低的子束。这导致光丝空间结构的明显规则化,而这种规则化是在辐射自聚焦阶段,由于子光束之间在非线性介质中的衍射相互作用而形成的。通过数值模拟发现,使用调制网格时,空气中飞秒激光辐射丝化区的总长度会缩短。同时,激光等离子体在这种丝状区中的纵向连续性会显著增加。研究表明,通过改变网格参数(十字线厚度和单元大小)以及网格掩膜相对于激光束中心的位置,可以在很大范围内控制丝状物的空间参数(起点坐标、长度和连续性)。这些结果对于预测高功率飞秒激光辐射在非线性介质中的传播,特别是沿大气路径的传播非常重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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