Chemical sensors based on quantum cascade lasers

Frank K. Tittel; Anatoliy A. Kosterev; Michel Rochat; Mattias Beck; Jerome Faist

doi:10.1117/12.452087

23 September 2002 Chemical sensors based on quantum cascade lasers

Frank K. Tittel, Anatoliy A. Kosterev, Michel Rochat, Mattias Beck, Jerome Faist

Proceedings Volume 4817, Diode Lasers and Applications in Atmospheric Sensing; (2002) https://doi.org/10.1117/12.452087
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

There is an increasing need in many chemical sensing applications ranging from industrial process control to environmental science and medical diagnostics for fast, sensitive, and selective gas detection based on laser spectroscopy. The recent availability of novel pulsed and cw quantum cascade distributed feedback (QC-DFB) lasers as mid-infrared spectroscopic sources address this need. A number of spectroscopic techniques have been demonstrated. For example, the authors have employed QC-DFB lasers for the monitoring and quantification of several trace gases and isotopic species in ambient air at ppmv and ppbv levels by means of direct absorption, wavelength modulation, cavity enhanced and cavity ringdown spectroscopy. In this work, pulsed thermoelectrically cooled QC-DFB lasers operating at ~15.6 μm were characterized for spectroscopic gas sensing applications. A new method for wavelength scanning based on the repetition rate modulation was developed. A non-wavelength-selective pyroelectric detector was incorporated in the gas sensor giving an advantage of room-temperature operation and low cost. Absorption lines of CO₂ and H₂O were observed in ambient air providing information about the concentration of these species.

Citation Download Citation

Frank K. Tittel, Anatoliy A. Kosterev, Michel Rochat, Mattias Beck, and Jerome Faist "Chemical sensors based on quantum cascade lasers", Proc. SPIE 4817, Diode Lasers and Applications in Atmospheric Sensing, (23 September 2002); https://doi.org/10.1117/12.452087

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