We used a thermoelectrically cooled, continuous-wave, quantum cascade laser operating between 1847 and 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 doublet of NO centered around . Using an astigmatic multiple-pass absorption cell with an optical path length of , we achieved a detection limit of at , with a total acquisition time of . The corresponding minimal detectable absorption is .
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