Physical Sciences Inc. Publications Abstract: Thermoelectrically Cooled Quantum Cascade Laser Based Sensor for Continuous Monitoring of Ambient Atmospheric CO

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Abstract: Thermoelectrically Cooled Quantum Cascade Laser Based Sensor for Continuous Monitoring of Ambient Atmospheric CO

A. A. Kosterev, F. K. Tittel, R. Köhler, C. Gmachl, F. Capasso, D. L. Sivco, A. Y. Cho, S. Wehe, M. Allen, "Thermoelectrically Cooled Quantum Cascade Laser Based Sensor for Continuous Monitoring of Ambient Atmospheric CO," Applied Optics 41 (6) (2002).

This paper was published in Applied Optics, Vol. 41, No. 6, 2002, and is made available as an electronic reprint with the permission of OSA. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, dupliation of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Abstract

We report the first application of a thermo-electrically cooled, distributed feedback quantum cascade laser for continuous monitoring of CO in ambient air based on absorption spectroscopy at 4.6 µm wavelength. A noise-equivalent detection limit of 12 ppb was experimentally demonstrated with a 102 cm optical pathlength and 2.5 min data acquisition time at 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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