非均匀预等离子体上产生的相对论高次谐波的束指向
Beam Pointing of Relativistic High-order Harmonics Genrated on a Nonuniform Pre-plasma
AI总结：
本文通过 Particle-in-cell 模拟研究非均匀预等离子体电子密度形状对相对论高次谐波束指向的影响，揭示等离子体流体动力学和几何光学效应共同导致谐波束偏离镜面反射。
摘要：
使用可调预脉冲是增强表面等离子体高次谐波产生的常用技术。电子密度的形状和动力学、电离程度及其速率以及等离子体加热都受到预脉冲特性的影响。非均匀预脉冲可能导致预等离子体区域出现空间变化的密度分布，该区域充当光谱上转换和反射表面。在激光场作用下，相应的几何特征和等离子体性质将影响谐波发射特性。本研究考察了由电子密度形状引起的谐波束指向变化。Particle-in-cell 模拟表明，等离子体流体动力学和几何光学效应都会导致谐波束偏离镜面反射方向。这项研究有助于理解高次谐波产生过程中表面等离子体的动力学。
英文摘要：
The use of tunable pre-pulse is a common technique to enhance the high-order harmonic generation from surface plasma. The shape and dynamic of the electron density, the degree of ionization and its rate, and the plasma heating are influenced by the pre-pulse properties. Non-uniform pre-pulse could cause a spatially varying density map to the pre-plasma region, which serves as the spectrally up-conversion and reflection surface. The corresponding geometrical feature and plasma nature under laser field will affect the harmonic emission properties. In this study, the variation in harmonic beam pointing due to the electron density shape was investigated. Particle-in-cell simulations demonstrated that both plasma hydrodynamics and geometrical optical effect induce the deviation of harmonic beam from specular reflection. This research contributes to the understanding of the surface plasma dynamics during high harmonic generation process.
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