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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 24 — Aug. 20, 2000
  • pp: 4425–4430

Effective utilization of quantum-cascade distributed-feedback lasers in absorption spectroscopy

Anatoliy A. Kosterev, Robert F. Curl, Frank K. Tittel, Claire Gmachl, Federico Capasso, Deborah L. Sivco, James N. Baillargeon, Albert L. Hutchinson, and Alfred Y. Cho  »View Author Affiliations


Applied Optics, Vol. 39, Issue 24, pp. 4425-4430 (2000)
http://dx.doi.org/10.1364/AO.39.004425


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Abstract

A variable duty cycle quasi-cw frequency scanning technique was applied to reduce thermal effects resulting from the high heat dissipation of type I quantum-cascade lasers. This technique was combined with a 100-m path-length multipass cell and a zero-air background-subtraction technique to enhance detection sensitivity to a parts-in-109 (ppb) concentration level for spectroscopic trace-gas detection of CH4, N2O, H2O, and C2H5OH in ambient air at 7.9 µm. A new technique for analysis of dense high-resolution absorption spectra was applied to detection of ethanol in ambient air, yielding a 125-ppb detection limit.

© 2000 Optical Society of America

OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition
(140.5960) Lasers and laser optics : Semiconductor lasers
(280.3420) Remote sensing and sensors : Laser sensors
(300.6320) Spectroscopy : Spectroscopy, high-resolution

History
Original Manuscript: November 17, 1999
Revised Manuscript: April 13, 2000
Published: August 20, 2000

Citation
Anatoliy A. Kosterev, Robert F. Curl, Frank K. Tittel, Claire Gmachl, Federico Capasso, Deborah L. Sivco, James N. Baillargeon, Albert L. Hutchinson, and Alfred Y. Cho, "Effective utilization of quantum-cascade distributed-feedback lasers in absorption spectroscopy," Appl. Opt. 39, 4425-4430 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-24-4425

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