Growth, saturation, and collapse of laser-driven plasma density gratings

H. Ma, S. Weng, P. Li, X. Li, Y. Wang, S. H. Yew, Min Chen, P. McKenna, Z. Sheng
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引用次数: 8

Abstract

The plasma density grating induced by intersecting intense laser pulses can be utilized as an optical compressors, polarizers, waveplates and photonic crystals for the manipulation of ultra-high-power laser pulses. However, the formation and evolution of the plasma density grating are still not fully understood as linear models are adopted to describe them usually. In this paper, two nonlinear theoretical models are presented to study the formation process of the plasma density grating. In the first model, a nonlinear analytical solution based on the fluid equations is presented while in the second model a particle-mesh method is adopted to investigate the kinetic effects. It is found that both models can describe the plasma density grating formation at different stages, well beyond the linear growth stage. More importantly, the second model can reproduce the phenomenon of "ion wave-breaking" of plasma density grating, which eventually induces the saturation of plasma density grating. Using the second model, the saturation time of the plasma density grating is obtained as a function of laser intensity and plasma density, which can be applied to estimate the lifetime of the plasma density grating in experiments. The results from these two nonlinear models are verified using particle-in-cell simulations.
激光驱动等离子体密度光栅的生长、饱和和坍缩
由强激光脉冲相交产生的等离子体密度光栅可以用作光压缩器、偏振器、波片和光子晶体,用于操纵超高功率激光脉冲。然而,等离子体密度光栅的形成和演变仍然没有完全被理解,通常采用线性模型来描述。本文提出了两个非线性理论模型来研究等离子体密度光栅的形成过程。在第一个模型中,采用基于流体方程的非线性解析解,而在第二个模型中,采用粒子网格法研究动力学效应。结果表明,这两种模型都能较好地描述等离子体密度光栅在不同阶段的形成过程,且均超出了线性生长阶段。更重要的是,第二个模型可以再现等离子体密度光栅的“离子破波”现象,最终导致等离子体密度光栅的饱和。利用第二种模型,得到了等离子体密度光栅的饱和时间与激光强度和等离子体密度的函数关系,可用于实验中等离子体密度光栅寿命的估计。这两种非线性模型的结果通过粒子池模拟得到了验证。
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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