  We report the first observation of nonlinear harmonic generation and sum
frequency generation (SFG) coupled with stimulated Raman scattering (SRS) via
the second-order (\chi^{(2)}) and the third-order (\chi^{(3)}) nonlinearities
in a silica microbottle resonator. The visible light emission due to third
harmonic generation (THG) was observed in both the output of a tapered fiber
and the optical microscope images, which can be used to identify the axial mode
profiles. SFG enabled by three- and four-wave mixing processes between the pump
light and the light generated via SRS was also observed. Second Harmonic
generation (SHG) and the SFG are enabled by \chi^{(2)} induced in silica by
surface effects and multipole excitations.

Optics