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

Paulo Castillo; Adrian Diaz; Benjamin Thomas; Barry Gross; Fred Moshary

doi:10.1117/12.2195169

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

Paulo Castillo, Adrian Diaz , Benjamin Thomas, Barry Gross, Fred Moshary

Author Affiliations +

Proceedings Volume 9640, Remote Sensing of Clouds and the Atmosphere XX; 96400P (2015) https://doi.org/10.1117/12.2195169
Event: SPIE Remote Sensing, 2015, Toulouse, France

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.

Citation Download Citation

Paulo Castillo, Adrian Diaz , Benjamin Thomas, Barry Gross, and 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); https://doi.org/10.1117/12.2195169

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