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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 26 — Dec. 24, 2007
  • pp: 17761–17771

Enhanced optical nonlinearity in amorphous silicon and its application to waveguide devices

Kazuhiro Ikeda, Yaoming Shen, and Yeshaiahu Fainman  »View Author Affiliations

Optics Express, Vol. 15, Issue 26, pp. 17761-17771 (2007)

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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
(160.4330) Materials : Nonlinear optical materials
(190.4180) Nonlinear optics : Multiphoton processes
(130.4815) Integrated optics : Optical switching devices

ToC Category:
Integrated Optics

Original Manuscript: October 15, 2007
Revised Manuscript: December 12, 2007
Manuscript Accepted: December 12, 2007
Published: December 13, 2007

Kazuhiro Ikeda, Yaoming Shen, and Yeshaiahu Fainman, "Enhanced optical nonlinearity in amorphous silicon and its application to waveguide devices," Opt. Express 15, 17761-17771 (2007)

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