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Applied Optics

Applied Optics


  • Vol. 38, Iss. 9 — Mar. 20, 1999
  • pp: 1859–1866

Cavity ringdown spectroscopy with a continuous-wave laser: calculation of coupling efficiency and a new spectrometer design

Jae Won Hahn, Yong Shim Yoo, Jae Yong Lee, Jae Wan Kim, and Hai-Woong Lee  »View Author Affiliations

Applied Optics, Vol. 38, Issue 9, pp. 1859-1866 (1999)

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For the efficient operation of a cavity ringdown spectroscopy (CRDS) system utilized with a continuous-wave (cw) laser, we numerically analyze the coupling efficiency of a cw laser to a ringdown cavity in terms of changes in the scanning rate, the laser linewidth, and the mirror reflectivity. We also demonstrate a new simple design for a CRDS system that can produce a CRDS signal with only a piezoelectric transducer (PZT), without the acousto-optic modulator that is usually adopted to switch off the cw laser beam that enters the cavity. Furthermore, we investigate the feasibility of the cw CRDS technique with a fast-scanning PZT by recording a CRDS spectrum of acetylene overtones. The detection sensitivity that corresponds to the noise-equivalent absorption is found to be ∼3 × 10-9/cm.

© 1999 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(300.0300) Spectroscopy : Spectroscopy
(300.6360) Spectroscopy : Spectroscopy, laser

Original Manuscript: September 21, 1998
Revised Manuscript: November 23, 1998
Published: March 20, 1999

Jae Won Hahn, Yong Shim Yoo, Jae Yong Lee, Jae Wan Kim, and Hai-Woong Lee, "Cavity ringdown spectroscopy with a continuous-wave laser: calculation of coupling efficiency and a new spectrometer design," Appl. Opt. 38, 1859-1866 (1999)

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