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We demonstrate an ultra-narrow-band optical filter based on a hybrid-microsphere consisting of a coated SiO_2.microsphere.As compared to the SiO_2 microsphere,the hvbrid-mierosphoro produces a quality factor of >10~8.a transmission sport nun bandwidth of <1pm.and an increased side-mode suppression ratio.The microsphere surface roughness and whispering gallery mode(WGM) transmission spectra are measured experimentally.A 0.01 nm bandwidth,single-wavelength fiber laser output is achieved with a tunable wavelength,using the SiO_2 microsphere as the mode selector.The optical field distribution and WGM transmission spectrum of the hybrid-microsphere with different coating parameters are theoretically investigated by the finite-difference time-domain method.
We demonstrate an ultra-narrow-band optical filter based on a hybrid-microsphere consisting of a coated SiO_2.microsphere.As compared to the SiO_2 microsphere, the hvbrid-mierosphoro produces a quality factor of> 10 ~ 8.a transmission sport nun bandwidth of <1 pm. and an increased side-mode suppression ratio. The microsphere surface roughness and whispering gallery mode (WGM) transmission spectra are measured experimentally. A 0.01 nm bandwidth, single-wavelength fiber laser output is achieved with a tunable wavelength, using the SiO 2 microsphere as the mode selector. The optical field distribution and WGM transmission spectrum of the hybrid-microsphere with different coating parameters are theoretically investigated by the finite-difference time-domain method.