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The tunable diode laser absorption spectroscopy under a pulse wavelength scan scheme is adapted to home-made room-temperature mid-infrared distributed feedback quantum cascade lasers; and identification of N 2 O spectral fingerprint is demonstrated experimentally. By driving the laser at 800 ns pulse duration, a wave number tuning of about 1.6 cm −1 is produced, which make both 1289.04 cm −1 and 1289.86 cm −1 absorption fingerprints of N 2 O gas to be definitely assigned. The measured relative absorption intensity is consistent with the HITRAN data precisely.
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Gangyi et al. (2006) studied this question.
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