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Understanding the beam self-cleaning behavior of ultrashort laser pulse filamentation

机译：了解超短激光脉冲灯丝的光束自清洁行为

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摘要

In this paper we report a recent study on the beam self-cleaning behavior occurred during the ultrashort laser pulse filamentation process. The propagation of a Gaussian beam with distorted beam profile is numerically simulated based on the nonlinear wave equation. Our results demonstrate that when the power is not too high so that multiple filaments are not yet induced, the intensity perturbation contained in the initial beam profile could be treated as high order spatial modes su-perpositioning on a fundamental mode. Then the self-focusing of the laser beam acts as a spatial filter. It focuses the fundamental mode toward the propagation axis, and produces a fundamental mode profile at the self-focus. While the strong diffraction of higher order modes could not be counteracted by the self-focusing. Therefore their propagation is mainly governed by the divergence without destroying the high profile quality at the self-focal region. These lead to the observation of beam profile self-cleaning behavior.
机译：在本文中，我们报告了有关超短激光脉冲细丝化过程中发生的光束自清洁行为的最新研究。基于非线性波动方程，数值模拟了高斯光束的光束轮廓畸变。我们的结果表明，当功率不是太高以至于还没有诱发出多个细丝时，初始光束轮廓中包含的强度扰动可以被​​视为叠加在基本模上的高阶空间模。然后，激光束的自聚焦充当空间滤波器。它将基本模式聚焦于传播轴，并在自聚焦时产生基本模式轮廓。自聚焦不能抵消高阶模的强衍射。因此，它们的传播主要受散度控制，而不会破坏自聚焦区域的高轮廓质量。这些导致观察到光束轮廓的自清洁行为。

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