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Updated: Aug 20, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
Pulsed quantum-cascade laser-based sensor for trace-gas detection of carbonyl sulfide
Gerard Wysocki1, Matt McCurdy, Stephen So
1Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77251, USA. gerardw@rice.edu
Abstract:
Simultaneous exhaled carbonyl sulfide (OCS) and carbon dioxide concentration measurements in human breath are demonstrated with a compact pulsed quantum-cascade laser-based gas sensor. We achieved a noise-equivalent sensitivity (1sigma) of 1.2 parts per billion by measuring a well-isolated OCS P(11) absorption line in the v3 band at 2057.6 cm(-1) using an astigmatic Herriott cell of 36-m optical path length and 0.4-s acquisition time.

