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空间不均的等离子体密度格的形成和特性

G Lehmann¹, K H Spatschek¹

¹Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany.

Physical review. E

|December 20, 2023

概括

等离子体密度格子比固体具有更高的损伤值. 由于短激光脉冲引起的这些网格的不均性,通过抑制侧叶,同时保持反射性来提高性能.

科学领域:

血物理学的等离子体物理学
非线性光学是一种非线性光学.
激光与等离子体相互作用

背景情况:

由于它们与固态材料相比具有较高的损坏值,等离子体密度网格越来越多地被研究为光学介质.
这些网格是由激光脉冲在低密度的等离子体中反传播而形成的.
在等离子电网格中空间均性的假设经常被违反,特别是在短,高功率的激光脉冲中.

研究的目的:

为了研究等离子体格子不均性对探头脉冲的反射和传输的影响.
分析高斯等离子体密度网格的特性,这些网格表现出一个apodized的形状.
为了比较不均格子与传统均格子的性能.

主要方法:

使用合模式方程进行理论分析.
一种有效的媒介方法来建模格子行为.
数字粒子在细胞 (PIC) 模拟以验证理论模型.

主要成果:

高斯等离子体密度格子作为apodized格子,通过侧叶抑制提高性能.
不均的网格保持高反射率和狭窄的带宽.
反射的探针脉冲会根据空间尺度产生声,在高斯电网格中观察到立方光谱相.

结论:

格子不均性显著影响探头脉冲反射和传输.
像高斯等离子体密度格子一样的apodized格子比同质格子具有优势.
反射脉冲中的光谱相位扭曲 (chirp) 是不均等离子网格的一个重要特征.

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