  We report on fabrication of crystalline lithium niobate microresonators with
quality factors above 10^7 as measured around 770 nm wavelength. Our technique
relies on femtosecond laser micromachining for patterning a mask coated on the
lithium niobate on insulate (LNOI) into a microdisk, followed by a
chemo-mechanical polishing process for transferring the disk-shaped pattern to
the LNOI. Nonlinear processes including second harmonic generation and Raman
scattering have been demonstrated in the fabricated microdisk.
