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Background-free single-beam coherent Raman spectroscopy assisted by air lasing

Fangbo Zhang, Hongqiang Xie, Luqi Yuan, Zhihao Zhang, Botao Fu, Shupeng Yu, Guihua Li, Ning Zhang, Xu Lu, Jinping Yao, Ya Cheng, and Zhizhan Xu

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Abstract

We develop a background-free single-beam coherent Raman scattering technique enabling the high-sensitivity detection of greenhouse gases. In this scheme, Raman coherence prepared by a femtosecond laser is interrogated by self-generated narrowband air lasing, thus allowing single-beam measurements without complex pulse shaping. The unique temporal and spectral characteristics of air lasing are beneficial for improving the signal-to-noise ratio and spectral resolution of Raman signals. With this method, SF6 gas present at a concentration of 0.38% was detected in an SF6–air mixture. This technique provides a simple and promising route for remote detection due to the low divergence of Raman signals and the availability of high-energy pump lasers, which may broaden the potential applications of air lasing.

© 2022 Optical Society of America

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Data underlying the results presented in this paper can be obtained from the authors upon reasonable request.

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