Gas-phase Raman spectroscopy of non-reacting flows: comparison between free-space and cavity-based spontaneous Raman emission.
Gas-phase Raman spectroscopy of non-reacting flows: comparison between free-space and cavity-based spontaneous Raman emission.
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DOI：
10.1364/ao.58.000c92
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发表时间：
2019-03
期刊：
影响因子：
1.9
通讯作者：
L. Weller;M. Kuvshinov;S. Hochgreb
中科院分区：
文献类型：
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作者：
L. Weller;M. Kuvshinov;S. Hochgreb
我们报告的自由空间和腔增强拉曼光谱的气相测量环境空气中的氮气和氧气的比较。实时分析能力和低功率二极管的连续拉曼信号使该技术非侵入性、经济实惠、紧凑，并适用于非反应流。我们推导出一个全面的模型来估计光子发射的自由空间和基于腔的信号，并讨论如何组织腔的几何形状相对于自由空间的最大增益的权衡。在自由和空腔配置的测量进行比较，预期的信号，表明有用的模型在预测放大。研究结果可为如何利用低功率连续波激光获得增强的激光诱导自发拉曼散射提供快速指导。
We report on a comparison of free-space and cavity-enhanced Raman spectroscopy for gas-phase measurements of nitrogen and oxygen in ambient air. Real-time analysis capabilities and continuous Raman signals with low power diodes make the technique non-invasive, affordable, compact, and applicable for usage in non-reacting flows. We derive a comprehensive model for estimation of photon emission for both free-space and cavity-based signals and discuss trade-offs in how to organize the cavity geometry for maximum gain relative to free space. Measurements in both free and cavity configurations are compared to the expected signals, demonstrating the usefulness of the model in predicting amplification. The present results can serve as a quick guide on how to use low-power continuous wave lasers in a cavity setup to obtain enhanced laser-induced spontaneous Raman scattering.