Simultaneous multi-laser, multi-species trace-level sensing of gas mixtures by rapidly swept continuous-wave cavity-ringdown spectroscopy
Date
2010
Authors
He, Y.
Kan, R.
Englich, F.
Liu, W.
Orr, B.
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Journal article
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Optics Express, 2010; 18(19):20059-20071
Statement of Responsibility
Yabai He, Ruifeng Kan, Florian V. Englich, Wenqing Liu and Brian J. Orr
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Abstract
The greenhouse-gas molecules CO2, CH4, and H2O are detected in air within a few ms by a novel cavity-ringdown laser-absorption spectroscopy technique using a rapidly swept optical cavity and multi-wavelength coherent radiation from a set of pre-tuned near-infrared diode lasers. The performance of various types of tunable diode laser, on which this technique depends, is evaluated. Our instrument is both sensitive and compact, as needed for reliable environmental monitoring with high absolute accuracy to detect trace concentrations of greenhouse gases in outdoor air.
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©2010 Optical Society of America