Optical cavity enhanced real-time absorption spectroscopy of CO₂ using laser amplitude modulation
Date
2014-08-05
Authors
Dong, Jiahao
Lam, Timothy T.-Y.
Gray, Malcolm B.
Warrington, Richard B
Roberts, Edward H.
Shaddock, Daniel A.
McClelland, David E.
Chow, Jong H.
Journal Title
Journal ISSN
Volume Title
Publisher
American Institute of Physics (AIP)
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 1572.992 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 isotopic ratio in CO₂, yielding an isotopic signature δ ¹³C of −83±9‰ for our CO₂ sample.
Description
Keywords
Citation
Collections
Source
Applied Physics Letters
Type
Journal article
Book Title
Entity type
Access Statement
License Rights
DOI
10.1063/1.4892535