16 October 2015 Open-path quantum cascade laser-based system for simultaneous remote sensing of methane, nitrous oxide, and water vapor using chirped-pulse differential optical absorption spectroscopy
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Abstract
Methane and Nitrous Oxide are long-lived greenhouse gases in the atmosphere with significant global warming effects. We report on application of chirped-pulsed quantum cascade lasers (QCLs) to simultaneous measurements of these trace gases in both open-path fence-line and backscatter systems. The intra-pulse thermal frequency chip in a QCL can be time resolved and calibrated to allow for high resolution differential optical absorption spectroscopy over the spectral window of the chip, which for a DFB-QCL can be reach ~2cm-1 for a 500 nsec pulse. The spectral line-shape of the output from these lasers are highly stable from pulse to pulse over long period of time (> 1 day), and the system does not require frequent calibrations.
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Paulo Castillo, Paulo Castillo, Adrian Diaz , Adrian Diaz , Benjamin Thomas, Benjamin Thomas, Barry Gross, Barry Gross, Fred Moshary, Fred Moshary, } "Open-path quantum cascade laser-based system for simultaneous remote sensing of methane, nitrous oxide, and water vapor using chirped-pulse differential optical absorption spectroscopy", Proc. SPIE 9640, Remote Sensing of Clouds and the Atmosphere XX, 96400P (16 October 2015); doi: 10.1117/12.2195169; https://doi.org/10.1117/12.2195169
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