We have observed various nonlinear effects in ultra-high Q crystalline whispering gallery mode (WGM) resonators. In particular, we demonstrated low threshold optical hyper-parametric oscillations in a high-Q (Q=1010) CaF2 WGM resonator. The oscillations result from the resonantly enhanced four-wave-mixing occurring due to Kerr nonlinearity of the material.

© 2004 Optical Society of America

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