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Optical whispering-gallery microresonators are useful tools inmicrophotonics, and nonlinear optics at very low threshold powers. Here, wepresent details about the fabrication of ultra-high-Q whispering-gallery-moderesonators made by CO2-laser lathe machining of fused-quartz rods. Theresonators can be fabricated in less than one minute and the obtained opticalquality factors exceed Q = 10^9. Demonstrated resonator diameters are in therange between 170 {\mu}m and 8 mm (free spectral ranges between 390 GHz and 8GHz). Using these microresonators, a variety of optical nonlinearities areobserved, including Raman scattering, Brillouin scattering and four-wavemixing.

Laser-Machined Ultra-High-Q Microrod Resonators for Nonlinear Optics