Sub-parts-per-billion level detection of NO2using room-temperature quantum cascade lasers
- 18 July 2006
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 103 (29) , 10846-10849
- https://doi.org/10.1073/pnas.0604238103
Abstract
We report the sub-parts-per-billion-level detection of NO2using tunable laser-based photoacoustic spectroscopy where the laser radiation is obtained from a room-temperature continuous-wave high-power quantum cascade laser operating in an external grating cavity configuration. The continuously tunable external grating cavity quantum cascade laser produces maximum single-frequency output of ≈300 mW tunable over ≈350 nm centered at 6.25 μm. We demonstrate minimum detection level of ≈0.5 parts per billion of NO2in the presence of humidified air.Keywords
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