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Electrical and electronic engineering, Communication engineering and systems
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 0.9×107 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.
Wang, P. et al: Lead silicate glass microsphere resonators with absorption-limited Q. Applied Physics Letters, Vol. 98, 18,2011, 181105. doi:10.1063/1.3586771