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

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

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    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 1572.992nm with effectively 100% measurement duty cycle. It achieved an absorption sensitivity of 5.2×10-9Hz-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 isotopic ratio in CO2, yielding an isotopic signature δ13C of -83±9‰ for our CO2 sample.

    Original languageEnglish
    Article number053505
    JournalApplied Physics Letters
    Volume105
    Issue number5
    DOIs
    Publication statusPublished - 4 Aug 2014

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