  In this work, we report optomechanical coupling, resolved sidebands and
phonon lasing in a solid-core microbottle resonator fabricated on a single mode
optical fiber. Mechanical modes with quality factors (Q_m) as high as 1.57*10^4
and 1.45*10^4 were observed, respectively, at the mechanical frequencies
f_m=33.7 MHz and f_m=58.9 MHz. The maximum f_m*Q_m~0.85*10^12 Hz is close to
the theoretical lower bound of 6*10^12 Hz needed to overcome thermal
decoherence for resolved-sideband cooling of mechanical motion at room
temperature, suggesting microbottle resonators as a possible platform for this
endeavor. In addition to optomechanical effects, scatter-induced mode splitting
and ringing phenomena, which are typical for high-quality optical resonances,
were also observed in a microbottle resonator.
