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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 8 — Mar. 10, 2010
  • pp: 1378–1387

Long-term stability in continuous wave cavity ringdown spectroscopy experiments

Haifeng Huang and Kevin K. Lehmann  »View Author Affiliations

Applied Optics, Vol. 49, Issue 8, pp. 1378-1387 (2010)

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Allan variance has been used to characterize the slow drift of a near-IR distributed feedback laser-based continuous wave cavity ringdown spectroscopy (CW-CRDS) system. Long-term drift in the cavity loss rate, highly correlated with changes in ambient pressure but not temperature, is observed. With differential measurement of on- and off-peak decay rates, the drift between them largely cancels out, but some residual drift remains if the lasers are detuned more than a few hundred megahertz from each other. A sensitivity to bulk cavity loss ( 1 σ ) of 4.4 × 10 12 cm 1 has been obtained during an optimum integration time of 30   min with our CW-CRDS setup, which corresponds to the methane detection limit ( 3 σ ) in N 2 of 0.24 parts in 10 9 by volume (ppbv) at 20 Torr or 29 parts in 10 12 by volume (pptv) at 760 Torr pressure. The stability of our system is demonstrated by measuring sub-ppbv methane in N 2 at 760 Torr through recording the spectrum of methane lines with our setup.

© 2010 Optical Society of America

OCIS Codes
(000.3860) General : Mathematical methods in physics
(120.1880) Instrumentation, measurement, and metrology : Detection
(280.3420) Remote sensing and sensors : Laser sensors
(300.1030) Spectroscopy : Absorption

ToC Category:
Remote Sensing and Sensors

Original Manuscript: December 1, 2009
Revised Manuscript: January 18, 2010
Manuscript Accepted: February 5, 2010
Published: March 8, 2010

Haifeng Huang and Kevin K. Lehmann, "Long-term stability in continuous wave cavity ringdown spectroscopy experiments," Appl. Opt. 49, 1378-1387 (2010)

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