Abstract
Broadly tunable whispering gallery mode (WGM) microbottle resonators (MBRs) are demonstrated with Q-factor in excess of $10^{5}$ . Dense and complex transmission spectra of the solid MBRs were simplified substantially by using a “shallow” MBR profile and microtaper excitation fibers with 10- ${\mu }\text{m}$ waist diameter. Mechanical tuning by strain over full azimuthal free spectral range (FSR) is demonstrated.
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