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Q: Fachverband Quantenoptik und Photonik
Q 43: Photonik III
Q 43.7: Talk
Thursday, March 13, 2008, 15:30–15:45, 2B/C
High-Q whispering gallery mode resonators made of lithium niobate crystals* — •Judith R. Schwesyg, Anne S. Zimmermann, Daniel Haertle, and Karsten Buse — Physikalisches Institut, Universität Bonn, Wegelerstr. 8, 53115 Bonn
Toroidally-shaped whispering-gallery-mode resonators made of amorphous or crystal materials are very promising for confining and trapping of light. The optical quality factor and the finesse reach very high values. Special fabrication techniques now enable to build such resonators from almost every material of interest. One useful crystalline material is lithium niobate which is widely used in integrated and guided-wave optics because of its favorable optical, piezoelectric, electrooptic, and photorefractive properties. In this talk we present the fabrication process of such resonators. Quality factors exceeding 107 and finesses higher than 400 are achieved. Mode spectra enable to determine absorption values of the material as small as 5× 10−3 cm−1. In a next step the resonators can be used as sensors maybe detecting single atoms.
*Financial support of the Deutsche Forschungsgemeinschaft (FOR557) and the Deutsche Telekom Stiftung is gratefully acknowledged.