在使用混合连贯反斯托克斯-拉曼散射的femtosecond灯丝中非平衡温度动态
Optics letters
|November 4, 2025
概括
这项研究使用连贯抗斯托克斯拉曼光谱法 (CARS) 来测量 Femtosecond激光生成的空气等离子体中的非平衡温度动态. 这项研究揭示了等离子体导线内振动温度和气体密度的时间演变.
科学领域:
- 等离子体物理学的物理学
- 激光引起的现象 激光引起的现象
- 频谱学是一种光谱学.
背景情况:
- 五秒激光丝在空气中产生短暂的高温等离子体通道.
- 了解这些丝体内的非平衡热力学过程对于应用至关重要.
- 一致抗斯托克斯拉曼光谱法 (CARS) 是一种用于探测分子性质的强大工具.
研究的目的:
- 为了研究一个 Femtosecond 激光等离子体灯光线内的空气中的非平衡温度动态.
- 为了展示一个混合的femtosecond/picosecondCARS技术,用于时间分辨率测量.
- 为了确定振动温度和气体数密度的时间演变.
主要方法:
- 使用混合型的femtosecond/picosecond CARS来获取ro-振动频谱.
- 使用CARS光谱配件来提取振动温度和气体数密度.
- 使用自发拉曼光谱学校准的旋转温度测量.
主要成果:
- 成功测量了时间分辨率的罗振动CARS光谱.
- 通过区分等离子体和周围的气体区域,提取振动温度的时间演变.
- 从光谱强度来确定气体发电线数密度.
- 推断的旋转温度动态.
结论:
- 该研究成功地描述了秒激光等离子体纤维中的非平衡温度动态.
- 混合CARS方法为暂时等离子体现象的时间解析诊断提供了一种可行的方法.
- 详细了解了激光诱导的空气等离子体的热力学演变.
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