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arXiv 1911.03440physics.plasm-ph
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laser产生的离子-等离子体光栅的非线性动力学:统一描述

Nonlinear dynamics of laser-generated ion-plasma gratings: a unified description

H. Peng, C. Riconda, M. Grech, J. -Q. Su, S. Weber

摘要:

激光等离子体光栅是一种动态光学元件,用于操纵高强度的相干光,超过固态材料的损伤阈值。它们的形成、演变和最终崩溃需要详细的了解。本文提出了一个模型来解释由两束相同的反向传播激光产生的空间周期有质动力势中的高振幅等离子体光栅的非线性动力学。分析了光栅动力学的流体和动力学方面。结果表明,绝热电子压缩起着至关重要的作用,因为电子压力可以反射离子从光栅和诱导光栅打破在X型的方式。一个单一的参数被发现,以确定光栅的行为和区分三个根本不同的制度的离子动力学:完全反射,部分反射/部分通过,和交叉。给出了光栅的饱和和寿命判据以及有限离子温度的影响。

英文摘要:

Laser-generated plasma gratings are dynamic optical elements for the manipulation of coherent light at high intensities, beyond the damage threshold of solid-stated based materials. Their formation, evolution and final collapse require a detailed understanding. In this paper, we present a model to explain the nonlinear dynamics of high amplitude plasma gratings in the spatially periodic ponderomotive potential generated by two identical counter-propagating lasers. Both, fluid and kinetic aspects of the grating dynamics are analyzed. It is shown that the adiabatic electron compression plays a crucial role as the electron pressure may reflect the ions from the grating and induce the grating to break in an X-type manner. A single parameter is found to determine the behaviour of the grating and distinguish three fundamentally different regimes for the ion dynamics: completely reflecting, partially reflecting/partially passing, and crossing. Criteria for saturation and life-time of the grating as well as the effect of finite ion temperature are presented.

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