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Theoretical investigation on the intracavity Doppler effect in continuous wave swept-cavity ringdown spectroscopy

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Abstract

We theoretically investigate the spectral measurement errors that are apt to occur in continuous wave (CW) cavity ringdown (CRD) techniques suffering intracavity Doppler shifts. In the typical CW CRD scheme based on a cavity sweep operation for the resonant coupling of a probe laser into a ringdown cavity, the intracavity probe light detunes gradually over time, carrying time-dependent loss information of an absorption feature. Frequency-drifting ringdown signals are theoretically modelled and found to result in erroneous absorption spectra that exhibit the frequency shift of absorption profiles as well as linewidth broadening.

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Authors and Affiliations

  1. Optical Metrology Division, Korea Research Institute of Standards and Science, 1 Doryong-dong, Yuseong-gu, Daejeon, 305-340, South Korea

    J.Y. Lee

  2. School of Mechanical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul, 120-749, South Korea

    J.W. Hahn

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  1. J.Y. Lee
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  2. J.W. Hahn
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Correspondence to J.W. Hahn.

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PACS

42.62.Fi; 42.60.Da; 42.25.BS

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Lee, J., Hahn, J. Theoretical investigation on the intracavity Doppler effect in continuous wave swept-cavity ringdown spectroscopy. Appl. Phys. B 79, 371–378 (2004). https://doi.org/10.1007/s00340-004-1550-2

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  • DOI: https://doi.org/10.1007/s00340-004-1550-2

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