连续波腔回归光谱学,采用离轴布局,白噪声扰动和光学再注射
Wangyou Chu1, Zhenzhen Li1, Jieqiong Gu1
1Hefei National Research Center for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
The Review of scientific instruments
|November 10, 2023
概括
我们开发了一种超灵敏的光谱仪,用于对等离子体中的反应性物种进行高分辨率分析. 这种连续波腔环降光谱 (cw-CRDS) 系统能够精确检测像13C13C这样的微量激素.
科学领域:
- 频谱学是一种光谱学.
- 等离子体物理学的物理学
- 物理化学 物理化学
背景情况:
- 高分辨率光谱对于识别等离子体中的反应性物种至关重要.
- 现有的方法往往缺乏对过渡物种的敏感性或时间分辨率.
研究的目的:
- 为了呈现一个超灵敏的连续波腔回归光谱学 (cw-CRDS) 光谱仪.
- 为了证明其在脉冲超音速等离子体中对反应激素和离子进行高分辨率光谱记录的能力.
主要方法:
- 使用了自制的外部空腔二极管激光器,具有无线电频率白噪声调制.
- 采用了一个离轴对齐的环落空腔,精度为~105.
- 包含用于光学再注射的多通孔和用于脉冲激光调制的半导体光学放大器.
主要成果:
- 在没有模式匹配的情况下实现了准连续激光腔合.
- 证明了与等离子体脉冲同步的时间控制的回落事件,精度为~3μs.
- 通过近红外光谱学成功检测到脉冲超音速C2H2/Ar等离子体中的13C13C微量激素.
结论:
- 开发的cw-CRDS光谱仪为等离子体中的短暂物种提供了超高的灵敏度和分辨率.
- 新的光学设计显著提高了光通量和合效率.
- 这种技术显示出在各种等离子体环境中对反应性物种进行详细表征的巨大潜力.
相关概念视频
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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01:28Standing Waves in a Cavity
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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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