Development and application of a diode-laser-based mid-infrared absorption sensor for carbon monoxide
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An all-solid-state continuous-wave (cw) laser system for mid-infrared absorption measurements of the carbon monoxide (CO) molecule has been developed and demonstrated. The single-mode, tunable output of a 60-mW, 860-nm external-cavity diode laser (ECDL) is difference-frequency mixed with the output of a 550 mW diode-pumped cw Nd:YAG laser in a periodically-poled lithium niobate (PPLN) crystal to produce approximately 2 μW of tunable cw radiation at 4.5 μm. The wavelength of the 860-nm ECDL is then scanned over a CO absorption line to produce a fully resolved absorption spectrum. Initial results from mixtures of CO in nitrogen in a room temperature gas cell are discussed. In addition, absorption measurements conducted at Wright-Patterson Air Force Base (WPAFB) demonstrated the system in the exhaust of a well-stirred reactor (WSR) where comparisons with physical sampling probe measurements are also presented.
author list (cited authors)
Barron-Jimenez, R., Anderson, T. N., Caton, J. A., Lucht, R. P., Walther, T., Roy, S., Brown, M. S., & Gord, J. R.