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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 29, Iss. 16 — Aug. 13, 2004
  • pp: 1837–1839

Application of a widely electrically tunable diode laser to chemical gas sensing with quartz-enhanced photoacoustic spectroscopy

Damien Weidmann, Anatoliy A. Kosterev, Frank K. Tittel, Neil Ryan, and David McDonald  »View Author Affiliations


Optics Letters, Vol. 29, Issue 16, pp. 1837-1839 (2004)
http://dx.doi.org/10.1364/OL.29.001837


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Abstract

A near-infrared diode laser with sample-grating distributed Bragg reflectors was used as a widely tunable spectroscopic source for multispecies chemical sensing. Quartz-enhanced photoacoustic spectroscopy was utilized to obtain high absorption sensitivity in a compact gas cell. CO<sub>2</sub> , H<sub>2</sub>O , C<sub>2</sub>H <sub>2</sub> , and NH<sub>3</sub> were monitored. A noise equivalent sensitivity of 8×10<sup>-9</sup>cm <sup>-1</sup>W <sup>-1</sup>>Hz <sup>-1/2</sup> for NH<sub>3</sub> detection was achieved, which corresponds to a NH<sub>3</sub> mixing ratio of 4.4 parts in 10<sup>6</sup> by volume (ppmv) with a 1-s time constant and available 5.2-mW optical power in the gas cell.

© 2004 Optical Society of America

OCIS Codes
(140.5960) Lasers and laser optics : Semiconductor lasers
(280.3420) Remote sensing and sensors : Laser sensors
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6430) Spectroscopy : Spectroscopy, photothermal

Citation
Damien Weidmann, Anatoliy A. Kosterev, Frank K. Tittel, Neil Ryan, and David McDonald, "Application of a widely electrically tunable diode laser to chemical gas sensing with quartz-enhanced photoacoustic spectroscopy," Opt. Lett. 29, 1837-1839 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-16-1837


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