Nonlinear branched flow of intense laser light in randomly uneven media

IF 4.8 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Matter and Radiation at Extremes Pub Date : 2023-03-01 DOI:10.1063/5.0133707
K. Jiang, T. W. Huang, C. N. Wu, M. Yu, H. Zhang, S. Z. Wu, H. Zhuo, A. Pukhov, C. Zhou, S. Ruan
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引用次数: 1

Abstract

Branched flow is an interesting phenomenon that can occur in diverse systems. It is usually linear in the sense that the flow does not alter the properties of the medium. Branched flow of light on thin films has recently been discovered. It is therefore of interest to know whether nonlinear light branching can also occur. Here, using particle-in-cell simulations, we find that in the case of an intense laser propagating through a randomly uneven medium, cascading local photoionization by the incident laser, together with the response of freed electrons in the strong laser fields, triggers space–time-dependent optical unevenness. The resulting branching pattern depends dramatically on the laser intensity. That is, the branching here is distinct from the existing linear ones. The observed branching properties agree well with theoretical analyses based on the Helmholtz equation. Nonlinear branched propagation of intense lasers potentially opens up a new area for laser–matter interaction and may be relevant to other branching phenomena of a nonlinear nature.
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强激光在随机不均匀介质中的非线性分支流动
分支流是一种有趣的现象,可以发生在不同的系统中。它通常是线性的,即流动不改变介质的性质。最近发现了光在薄膜上的分支流。因此,了解非线性光分支是否也会发生是很有意义的。在这里,使用粒子在细胞中的模拟,我们发现,在强激光通过随机不均匀介质传播的情况下,入射激光的级联局部光电离,以及强激光场中自由电子的响应,触发了时空相关的光学不均匀性。所产生的分支图案很大程度上取决于激光强度。也就是说,这里的分支不同于现有的线性分支。观察到的分支性质与基于亥姆霍兹方程的理论分析吻合得很好。强激光的非线性分支传播为激光与物质相互作用开辟了一个新的研究领域,并可能与其他具有非线性性质的分支现象相关。
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来源期刊
Matter and Radiation at Extremes
Matter and Radiation at Extremes Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
8.60
自引率
9.80%
发文量
160
审稿时长
15 weeks
期刊介绍: Matter and Radiation at Extremes (MRE), is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation, and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory. Drivers, targets and diagnostics are included along with related numerical simulation and computational methods. It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.
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