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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 25 — Dec. 10, 2007
  • pp: 17443–17448

Cavity-enhanced laser absorption spectroscopy using microresonator whispering-gallery modes

G. Farca, S. I. Shopova, and A. T. Rosenberger  »View Author Affiliations


Optics Express, Vol. 15, Issue 25, pp. 17443-17448 (2007)
http://dx.doi.org/10.1364/OE.15.017443


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Abstract

Tunable diode laser absorption spectroscopy using microresonator whispering-gallery modes (WGMs) is demonstrated. WGMs are excited around the circumference of a cylindrical cavity 125 µm in diameter using an adiabatically tapered fiber. The microresonator is very conveniently tuned by stretching, enabling the locking of an individual WGM to the laser. As the laser is scanned in frequency over an atmospheric trace-gas absorption line, changes in the fiber throughput are recorded. The experimental results of cavity-enhanced detection using such a microresonator are centimeter effective absorption pathlengths in a volume of only a few hundred microns cubed. The measured effective absorption pathlengths are in good agreement with theory.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.5750) Optical devices : Resonators
(300.1030) Spectroscopy : Absorption
(350.3950) Other areas of optics : Micro-optics

ToC Category:
Sensors

History
Original Manuscript: October 1, 2007
Revised Manuscript: October 19, 2007
Manuscript Accepted: October 21, 2007
Published: December 10, 2007

Virtual Issues
Vol. 3, Iss. 1 Virtual Journal for Biomedical Optics
Physics and Applications of Microresonators (2007) Optics Express

Citation
G. Farca, S. I. Shopova, and A. T. Rosenberger, "Cavity-enhanced laser absorption spectroscopy using microresonator whispering-gallery modes," Opt. Express 15, 17443-17448 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-25-17443


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