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Absorption spectroscopy with quantum cascade lasers

Citation:

AA Kosterev, RF Curl, FK Tittel, C Gmachl, F Capasso, DL Sivco, JN Baillargeon, AL Hutchinson, and AY Cho. 2001. “Absorption spectroscopy with quantum cascade lasers.” LASER PHYSICS, 11, 1, Pp. 39-49.

Abstract:

Novel pulsed and cw quantum cascade distributed feedback (QC-DFB) lasers operating near lambda = 8 mum were used for detection and quantification of trace gases in ambient air by means of sensitive absorption spectroscopy. N2O, (CH4)-C-12, (CH4)-C-13, and different isotopic species of H2O were detected. Also, a highly selective detection of ethanol vapor in air with a sensitivity of 125 parts per billion by volume (ppb) was demonstrated.