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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 6 — Jun. 1, 2012
  • pp: 1305–1315

Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry instrumentation for Doppler-broadened detection in the 1012cm1Hz1/2 region

Patrick Ehlers, Isak Silander, Junyang Wang, and Ove Axner  »View Author Affiliations


JOSA B, Vol. 29, Issue 6, pp. 1305-1315 (2012)
http://dx.doi.org/10.1364/JOSAB.29.001305


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Abstract

A fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry (FL-NICE-OHMS) system for white-noise-limited Doppler-broadened detection down to 5.6×1012cm1Hz1/2 is demonstrated. The system is based on a previous FL-NICE-OHMS instrumentation in which the locking of the laser frequency to a cavity mode has been improved by the use of an acousto-optic modulator (AOM) and provision of a more stable environment by the employment of a noise-isolating enclosed double-layer table, a temperature regulation of the laboratory, and an ultra-high-vacuum (UHV) gas system. White-noise behavior up to 10 s provides the instrument with a minimum detectable on-resonance absorbance per unit length of 1.8×1012cm1 and a relative single-pass absorption (ΔI/I) of 7.2×1011. The system was applied to detection of acetylene on a transition at 1531.588 nm, yielding a detection sensitivity of C2H2 in atmospheric pressure gas of 4 ppt (measured over 10 s).

© 2012 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4780) Lasers and laser optics : Optical resonators
(230.1040) Optical devices : Acousto-optical devices
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(140.3425) Lasers and laser optics : Laser stabilization

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: December 14, 2011
Manuscript Accepted: February 15, 2012
Published: May 17, 2012

Citation
Patrick Ehlers, Isak Silander, Junyang Wang, and Ove Axner, "Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry instrumentation for Doppler-broadened detection in the 10−12  cm−1 Hz−1/2 region," J. Opt. Soc. Am. B 29, 1305-1315 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-6-1305

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