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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 6 — Jun. 1, 2007
  • pp: 1392–1405

Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry for Doppler-broadened detection of C 2 H 2 in the parts per trillion range

Florian M. Schmidt, Aleksandra Foltynowicz, Weiguang Ma, and Ove Axner  »View Author Affiliations

JOSA B, Vol. 24, Issue 6, pp. 1392-1405 (2007)

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A compact noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) spectrometer, based on a narrowband erbium-doped fiber laser and an integrated optics electro-optic modulator, has been developed for trace species detection. A general theoretical description of NICE-OHMS signals demodulated at an arbitrary FM detection phase is provided in terms of the analyte concentration. Explicit expressions for Doppler-broadened NICE-OHMS line shapes, which are in excellent agreement with the measurements, are given. In a first demonstration, using a cavity with a finesse of 1400, acetylene has been detected on a Doppler-broadened transition at 1531 nm . A limit of detection of 130 ppt , corresponding to an absorption of 2.4 × 10 9 cm 1 , has been obtained.

© 2007 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(140.3510) Lasers and laser optics : Lasers, fiber
(300.1030) Spectroscopy : Absorption
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6380) Spectroscopy : Spectroscopy, modulation

ToC Category:

Original Manuscript: December 20, 2006
Revised Manuscript: February 13, 2007
Manuscript Accepted: February 14, 2007
Published: May 17, 2007

Florian M. Schmidt, Aleksandra Foltynowicz, Weiguang Ma, and Ove Axner, "Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry for Doppler-broadened detection of C2H2 in the parts per trillion range," J. Opt. Soc. Am. B 24, 1392-1405 (2007)

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