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Carbonyl sulfide detection with a thermoelectrically cooled midinfrared quantum cascade laser

Chad Roller, Anatoliy A. Kosterev, Frank K. Tittel, Kiyoji Uehara, Claire Gmachl, and Deborah L. Sivco

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Abstract

A compact absorption spectrometer with a midinfrared tunable quantum cascade laser operating at 4.86 µm2054 cm-1 is used to measure lower concentrations of carbonyl sulfide (COS) in air. A detection sensitivity of ∼30 parts in 109 of COS and the selectivity of two stable isotopes,  12C16O32S and  12C16O34S, are demonstrated. Specifically, the feasibility of detecting COS in expired human breath as a potential noninvasive medical diagnostic tool is investigated.

© 2003 Optical Society of America

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