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Applied Optics

Applied Optics


  • Vol. 44, Iss. 27 — Sep. 20, 2005
  • pp: 5824–5831

Simultaneous multispecies gas sensing by use of a sampled grating distributed Bragg reflector and modulated grating Y laser diode

Richard Phelan, Michael Lynch, John F. Donegan, and Vincent Weldon  »View Author Affiliations

Applied Optics, Vol. 44, Issue 27, pp. 5824-5831 (2005)

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Widely tunable laser diodes operating at 1520 ≤ λ ≤ 1570 nm are characterized and compared for use as sources for tunable laser diode gas absorption spectroscopy. Three gases, hydrogen cyanide, ammonia, and acetylene, with overlapping absorption features within the 50 nm tuning range of the devices were targeted by use of wavelength modulation spectroscopy with second-harmonic detection. In addition, a method for modulating the laser to improve sensitivity by taking advantage of the unique structure of these devices is reported.

© 2005 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(280.1740) Remote sensing and sensors : Combustion diagnostics
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared

Original Manuscript: January 25, 2005
Manuscript Accepted: March 11, 2005
Published: September 20, 2005

Richard Phelan, Michael Lynch, John F. Donegan, and Vincent Weldon, "Simultaneous multispecies gas sensing by use of a sampled grating distributed Bragg reflector and modulated grating Y laser diode," Appl. Opt. 44, 5824-5831 (2005)

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