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Updated: Jun 8, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
Simultaneous multi-laser, multi-species trace-level sensing of gas mixtures by rapidly swept continuous-wave
Yabai He1, Ruifeng Kan, Florian V Englich
1MQ Photonics Research Centre, Macquarie University, Sydney, NSW, Australia.
Abstract:
The greenhouse-gas molecules CO(2), CH(4), and H(2)O are detected in air within a few ms by a novel cavity-ringdown laser-absorption spectroscopy technique using a rapidly swept optical cavity and multi-wavelength coherent radiation from a set of pre-tuned near-infrared diode lasers. The performance of various types of tunable diode laser, on which this technique depends, is evaluated. Our instrument is both sensitive and compact, as needed for reliable environmental monitoring with high absolute accuracy to detect trace concentrations of greenhouse gases in outdoor air.
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