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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: G. I. Stegeman
  • Vol. 23, Iss. 4 — Apr. 1, 2006
  • pp: 727–740

Laser-locked, high-repetition-rate cavity ringdown spectrometer

R. Z. Martínez, Markus Metsälä, Olavi Vaittinen, Tommi Lantta, and Lauri Halonen  »View Author Affiliations


JOSA B, Vol. 23, Issue 4, pp. 727-740 (2006)
http://dx.doi.org/10.1364/JOSAB.23.000727


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Abstract

We describe the design, construction, and initial performance evaluation of a high-repetition-rate cavity ringdown spectrometer. The spectrometer is based on the use of the Pound–Drever–Hall technique to lock the laser frequency to the maximum of a transmission fringe of the interferometer used as a sample cell. This results in continuous injection of light into the interferometer. The injection is repetitively interrupted with an acousto-optical modulator to generate ringdowns (exponential decays) at a typical rate of 10 kHz . Averaging of these large numbers of fitted ringdown times allows us to attain a minimum detectable absorption of 1.43 × 10 11 cm 1 Hz 1 2 short term and 9.0 × 10 11 cm 1 Hz 1 2 long term. In addition, the spectrometer has a continuous tuning capability of 1 cm 1 , which allows the use of standard linearization and frequency calibration techniques for the spectrum. To illustrate the operation and sensitivity of the spectrometer, part of the Q-branch of a weak acetylene overtone has been recorded.

© 2006 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6390) Spectroscopy : Spectroscopy, molecular

ToC Category:
Spectroscopy

History
Original Manuscript: September 1, 2005
Manuscript Accepted: October 17, 2005

Citation
R. Z. Martínez, Markus Metsälä, Olavi Vaittinen, Tommi Lantta, and Lauri Halonen, "Laser-locked, high-repetition-rate cavity ringdown spectrometer," J. Opt. Soc. Am. B 23, 727-740 (2006)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-23-4-727


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