Zhang F, Xie H, Yuan L, Zhang Z, Fu B, Yu S, Li G, Zhang N, Lu X, Yao J, Cheng Y, Xu Z. Background-free single-beam coherent Raman spectroscopy assisted by air lasing.
OPTICS LETTERS 2022;
47:481-484. [PMID:
35103656 DOI:
10.1364/ol.441602]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 11/15/2021] [Indexed: 06/14/2023]
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.
Collapse