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Optical cavity enhanced real-time absorption spectroscopy of CO₂ using laser amplitude modulation

Dong, Jiahao; Lam, Timothy T.-Y.; Gray, Malcolm B.; Warrington, Richard B; Roberts, Edward H.; Shaddock, Daniel A.; McClelland, David E.; Chow, Jong H.


We present a spectrometer based on the cavity enhanced amplitude modulated laser absorption spectroscopy (CEAMLAS) technique for measuring molecular gas absorption. This CEAMLAS spectrometer accurately measured a CO₂ absorption line at 1572.992 nm with effectively 100% measurement duty cycle. It achieved an absorption sensitivity of 5.2 × 10⁻⁹ Hz⁻¹∕² using a linear Fabry-Perot cavity with a modest finesse of ≈1000. We also used the spectrometer to perform preliminary measurements of the ¹³C/¹²C...[Show more]

CollectionsANU Research Publications
Date published: 2014-08-05
Type: Journal article
Source: Applied Physics Letters
DOI: 10.1063/1.4892535


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