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Proceedings Article

Trace gas detection with DFB lasers and cavity ring-down spectroscopy

[+] Author Affiliations
Jerome Morville, Marc Chenevier, Daniele Romanini

Univ. Joseph Fourier (France)

Alexander A. Kachanov

Informed Dianostics (France)

Proc. SPIE 4485, Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV, 236 (January 30, 2002); doi:10.1117/12.454256
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From Conference Volume 4485

  • Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV
  • Allen M. Larar; Martin G. Mlynczak
  • San Diego, CA, USA | July 29, 2001

abstract

We recently demonstrated trace detection using Cavity Ring Down Spectroscopy (CRDS) coupled with telecom DFB diode lasers. Our scheme exploits optical feedback from a V-shaped cavity back to the laser. We built trace-gas detectors for CH4 and HF, characterized by a low cost, simplicity, compactness and sensitivity. Operating wavelength are 1.312 micrometers for HF and 1.65 micrometers for methane. The optical setup includes a distributed feed-back (DFB) diode laser, temperature stabilized by a Peltier, a collimating lens, 2 steering mirrors, a V-shaped optical resonator and a photodiode. The V-cavity is made of three low-cost super mirrors R 99.995%) and contains the air sample to be analyzed (20cm3). In standard atmospheric conditions the detection limits for 1 second integration time are of 50 ppbv for HF and 200 ppbv for methane. We present an analysis of the mechanisms of cavity injection and laser feedback, allowing to estimate the influence of various parameters on the performances of this type of apparatus. Calculations and results are given, with particular emphasis on the detection limit and the dynamic range.

© (2002) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Jerome Morville ; Marc Chenevier ; Alexander A. Kachanov and Daniele Romanini
"Trace gas detection with DFB lasers and cavity ring-down spectroscopy", Proc. SPIE 4485, Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV, 236 (January 30, 2002); doi:10.1117/12.454256; http://dx.doi.org/10.1117/12.454256


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