Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 103, Issue 29, Pages 10846-10849Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0604238103
Keywords
iR lasers; NO2 spectroscopy; photoacoustic spectroscopy; sub-parts-per-billion detection of gases
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We report the sub-parts-per-billion-level detection of NO2 using 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 approximate to 300 mW tunable over approximate to 350 nm centered at 6.25 mu m.We demonstrate minimum detection level of approximate to 0.5 parts per billion of NO2 in the presence of humidified air.
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