Abstract

We used a thermoelectrically cooled, continuous-wave, quantum cascade laser operating between 1847 and 1854cm1 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 P7.5 doublet of NO centered around 1850.18cm1. Using an astigmatic multiple-pass absorption cell with an optical path length of 76m, we achieved a detection limit of 0.2ppbv at 10kPa, with a total acquisition time of 30s. The corresponding minimal detectable absorption is 8.8×109cm1Hz12.

© 2006 Optical Society of America

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