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OSA Publishing > Applied Optics > Volume 47 > Issue 27 > Page 4884

Optically multiplexed multi-gas detection using quantum cascade laser photoacoustic spectroscopy

Anadi Mukherjee, Manu Prasanna, Michael Lane, Rowel Go, Ilya Dunayevskiy, Alexei Tsekoun, and C. Kumar N. Patel

Author Affiliations

Anadi Mukherjee,1 Manu Prasanna,1 Michael Lane,1 Rowel Go,1 Ilya Dunayevskiy,1 Alexei Tsekoun,1 and C. Kumar N. Patel1,2,*

1Pranalytica, Inc., 1101 Colorado Avenue, Santa Monica, California 90401, USA

2Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, California 90095, USA

These individuals contributed equally to the work reported here.

*Corresponding author: [email protected]

  • History
    • Original Manuscript: June 12, 2008
    • Manuscript Accepted: July 16, 2008
    • Published: September 12, 2008
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Abstract

We report high-throughput, nondispersive optical multiplexing of laser beams using a scanning galvanometer. We have utilized this technique for multispecies trace-gas detection using multiple quantum cascade laser photoacoustic spectroscopy. We demonstrate switching from one laser to another in less than 1 s, a performance level needed for a comprehensive multispecies sensor, and a high signal-to-noise ratio detection of five gaseous components, NH3, NO2, dimethyl methyl phosphonate (DMMP, a simulant for nerve agents), acetone, and ethylene glycol, in a room air gas mixture containing ∼3 ppb of NH3, ∼8 ppb of NO2, ∼20 ppb of DMMP, ∼30 ppb of acetone, and ∼40 ppb of ethylene glycol.

© 2008 Optical Society of America

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