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  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 2002),
  • paper CTuK33

Temperature Tuning of Optical Whispering-gallery Modes as a Sensitive Probe of Thermal Interaction Between a Fused-silica Microsphere and the Ambient Air

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Abstract

We used a tunable diode laser operating near 1550 nm to investigate various effects of the heat transfer from fused-silica microspheres to the surrounding air. The resonance frequencies of microsphere whispering-gallery modes (WGMs), excited by a tapered-fiber coupler, shift with increasing temperature (about -1.6 GHz/K at 1550 nm). This shift, primarily due to the temperature dependence of the refractive index of fused silica, enables the measurements whose results are reported here: novel techniques for determining the thermal accommodation coefficient and the optical absorption coefficient.

© 2002 Optical Society of America

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