Background-free single-beam coherent Raman spectroscopy assisted by air lasing.
Opt Lett
; 47(3): 481-484, 2022 Feb 01.
Article
em En
| MEDLINE
| ID: mdl-35103656
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.
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MEDLINE
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En
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Opt Lett
Ano de publicação:
2022
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Article