Broadly tunable solid microbottle resonator

Highly tunable solid microbottle resonator (MBR) is demonstrated with ß-factors up to 10
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. MBR-WGM spectrum was cleaned-up by evanescently coupling on different positions of an optical microtaper fiber. The mechanical tuning of 3.71 nm on the traced MBR-WGMs corresponds to ∼0.9 FSR resonance shift.