多通道多普勒纤维成像谱仪用于高强度激光驱动等离子体的时空特征
G Zeraouli1,2, M Marconi1, B Sullivan1,3
1Colorado State University, Fort Collins, Colorado 80523, USA.
The Review of scientific instruments
|April 15, 2024
概括
我们开发了一种基于纤维的灵活光谱仪,用于高重复率的激光等离子体实验. 该仪器以高空间和时间分辨率绘制了等离子体速度演变的地图,使得详细的等离子体表征成为可能.
科学领域:
- 等离子体物理学的物理学
- 激光诱导的等离子体
- 频谱学是一种光谱学.
背景情况:
- 描述激光诱导等离子体对于理解高强度激光物质相互作用至关重要.
- 现有的诊断方法往往缺乏动态等离子体研究所需的空间和时间分辨率.
研究的目的:
- 为了展示一种新的基于纤维的成像多普勒光谱仪用于等离子体表征.
- 为了实现高空间和时间分辨率测量等离子体速度演变.
主要方法:
- 使用了一种灵活的多通道纤维成像多普勒光谱仪.
- 结合光纤与单个成像光谱仪收集来自21个等离子体位置的数据.
- 采用400nm探针束 (10^11 W/cm^2) 来测量由10^18 W/cm^2激光脉冲产生的多普勒偏移从等离子体临界表面.
主要成果:
- 通过20μm空间分辨率实现了等离子体的二维速度测量.
- 绘制了等离子体速度演变的地图,时间分辨率低于皮秒.
- 证明了在高强度 (≥1 × 10^18 W/cm^2) 激光等离子体实验中以高重复率对等离子体进行表征的能力.
结论:
- 开发的光谱仪为详细的等离子体诊断提供了一个强大的工具.
- 该仪器可以使用单个光谱仪扩展到更多的频道 (例如100).
- 这种诊断能够在高重复率下进行激光-等离子相互作用的先进研究.
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