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Lead silicate glass microsphere resonators with absorption-limited Q
Pengfei Wang1,2, Ganapathy Senthil Murugan1, Timothy Lee1, Xian Feng1, Yuliya Semenova2, Qiang Wu2, Wei Loh1, Gilberto Brambilla1, James S.Wilkinson1 and Gerald Farrell2
1. Optoelectronics Research Centre, University of Southampton, UK
2. Photonics Research Centre, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland
We report the fabrication and characterization of a lead-silicate glass microsphere resonator. We show that at the wavelengths near 1555 nm high Q modes can be efficiently excited from a 109 μm diameter lead-silicate glass microsphere via evanescent coupling using a tapered silica fiber with a waist diameter of 2 μm. Resonances with Q-factors as high as 0.9 x 107 were observed. This is very close to the theoretical material-limited Q-factor and is the highest Q-factor reported so far from a nonlinear glass microsphere.
Applied Physics Letters (2011) Vol.98(18) pp.181105
Copyright University of Southampton 2006