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Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 3, Iss. 6 — Jun. 17, 2008

Using active resonator impedance matching for shot-noise limited, cavity enhanced amplitude modulated laser absorption spectroscopy

Jong H. Chow, Ian C. M. Littler, David S. Rabeling, David E. McClelland, and Malcolm B. Gray  »View Author Affiliations

Optics Express, Vol. 16, Issue 11, pp. 7726-7738 (2008)

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We introduce a closed-loop feedback technique to actively control the coupling condition of an optical cavity, by employing amplitude modulation of the interrogating laser. We show that active impedance matching of the cavity facilitates optimal shot-noise sensing performance in a cavity enhanced system, while its control error signal can be used for intra-cavity absorption or loss signal extraction. We present the first demonstration of this technique with a fiber ring cavity, and achieved shot-noise limited loss sensitivity. We also briefly discuss further use of impedance matching control as a tool for other applications.

© 2008 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(230.5750) Optical devices : Resonators
(300.1030) Spectroscopy : Absorption
(300.6380) Spectroscopy : Spectroscopy, modulation

ToC Category:

Original Manuscript: March 14, 2008
Revised Manuscript: May 2, 2008
Manuscript Accepted: May 9, 2008
Published: May 14, 2008

Virtual Issues
Vol. 3, Iss. 6 Virtual Journal for Biomedical Optics

Jong H. Chow, Ian C. Littler, David S. Rabeling, David E. McClelland, and Malcolm B. Gray, "Using active resonator impedance matching for shot-noise limited, cavity enhanced amplitude modulated laser absorption spectroscopy," Opt. Express 16, 7726-7738 (2008)

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