Journal
OPTICS LETTERS
Volume 31, Issue 6, Pages 823-825Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.31.000823
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We used a thermoelectrically cooled, continuous-wave, quantum cascade laser operating between 1847 and 1854 cm(-1) in combination with wavelength modulation spectroscopy for the detection of nitric oxide (NO) at the sub-part-per-billion by volume (ppbv) level. The laser emission overlaps the P-7.5 doublet of NO centered around 1850.18 cm(-1). Using an astigmatic multiple-pass absorption cell with an optical path length of 76 m, we achieved a detection limit of 0.2 ppbv at 1.0 kPa, with a total acquisition time of 30 s. The corresponding minimal detectable absorption is 8.8 X 10(-9) cm(-1) Hz(-1/2). (c) 2006 Optical Society of America.
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