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, Hai Woong Lee

Research output: Contribution to journalArticle

63 Citations (Scopus)


For the efficient operation of a cavity ringdown spectroscopy (CRDS) system utilized with a continuouswave (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.

Original languageEnglish
Pages (from-to)1859-1866
Number of pages8
JournalApplied Optics
Issue number9
Publication statusPublished - 1999 Mar 20


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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