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  • Title: Thermoelectrically cooled quantum-cascade-laser-based sensor for the continuous monitoring of ambient atmospheric carbon monoxide.
    Author: Kosterev AA, Tittel FK, Köhler R, Gmachl C, Capasso F, Sivco DL, Cho AY, Wehe S, Allen MG.
    Journal: Appl Opt; 2002 Feb 20; 41(6):1169-73. PubMed ID: 11900141.
    Abstract:
    We report the first application of a thermoelectrically cooled, distributed-feedback quantum-cascade laser for continuous spectroscopic monitoring of CO in ambient air at a wavelength of 4.6 microm. A noise-equivalent detection limit of 12 parts per billion was demonstrated experimentally with a 102-cm optical pathlength and a 2.5-min data acquisition time at a 10-kHz pulsed-laser repetition rate. This sensitivity corresponds to a standard error in fractional absorbance of 3 x 10(-5).
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