Theoretical analysis on the dynamic absorption saturation in pulsed cavity ringdown spectroscopy

J. Y. Lee, J. W. Hahn

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


We perform a theoretical analysis on the transient dynamics of absorption saturation in pulsed cavity ringdown spectroscopy. Based on a coupled rate equation approach, modelling of the dynamic saturation is carried out to account for time-evolving intracavity photon density and absorbing population. Master equations are derived in terms of normalized system parameters, which enables one to systematically study the non-exponential feature of saturated cavity ringdown signals. Erroneous quantification of sample absorbance by the conventional ringdown time analysis is numerically simulated, and the saturated spectral feature showing a Lamb dip is obtained for a Doppler broadened sample. Finally a novel numerical recipe is proposed to handle saturated ringdown signals and retrieve unsaturated spectra, allowing relevant absorption parameters without degrading the measurement signal-to-noise ratio.

Original languageEnglish
Pages (from-to)653-662
Number of pages10
JournalApplied Physics B: Lasers and Optics
Issue number5
Publication statusPublished - 2004 Sept

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)


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