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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 36 — Dec. 20, 2000
  • pp: 6866–6872

Trace-gas detection in ambient air with a thermoelectrically cooled, pulsed quantum-cascade distributed feedback laser

Anatoliy A. Kosterev, 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 36, pp. 6866-6872 (2000)
http://dx.doi.org/10.1364/AO.39.006866


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Abstract

A pulsed quantum-cascade distributed feedback laser operating at near room temperature was used for sensitive high-resolution IR absorption spectroscopy of ambient air at a wavelength of ∼8 µm. Near-transform-limited laser pulses were obtained owing to short (∼5-ns) current pulse excitation and optimized electrical coupling. Fast and slow computer-controlled frequency scanning techniques were implemented and characterized. Fast computer-controlled laser wavelength switching was used to acquire second-derivative absorption spectra. The minimum detectable absorption was found to be 3 × 10-4 with 105 laser pulses (20-kHz repetition rate), and 1.7 × 10-4 for 5 × 105 pulses, based on the standard deviation of the linear regression analysis.

© 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: June 1, 2000
Revised Manuscript: August 24, 2000
Published: December 20, 2000

Citation
Anatoliy A. Kosterev, Frank K. Tittel, Claire Gmachl, Federico Capasso, Deborah L. Sivco, James N. Baillargeon, Albert L. Hutchinson, and Alfred Y. Cho, "Trace-gas detection in ambient air with a thermoelectrically cooled, pulsed quantum-cascade distributed feedback laser," Appl. Opt. 39, 6866-6872 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-36-6866

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