Cavity-enhanced absorption detection of H2S in the near-infrared using a gain-switched frequency comb laser
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A custom-designed gain-switched frequency comb laser was passively coupled of to a medium-finesse cavity in the region between 6346 and 6354 cm−1 for the development of a prototype cavity enhanced absorption setup. The setup was applied to static gas detection of hydrogen sulfide at the parts per thousand level in a laboratory environment. A Fourier transform spectrometer was used for signal detection. The experimental performance of the setup was characterized in this proof-of-principle investigation; advantages, drawbacks and future scope of the approach are discussed in this article.
The support by Science Foundation Ireland’s (SFI) TIDA Programme (14/TIDA/2415) is gratefully acknowledged. Enterprise Ireland (EI) is also providing financial support under the Technology Innovation Development Award scheme, Commercialisation Fund (CF 2017 0683B). We would like to thank Prof Frank Peters and Prof John McInerney for the loan of an OSA for this project. We are grateful to Mr Christy Roche and Mr Joe Sheehan for their excellent technical assistance.
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