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
A. A. Savchenkov, D. Strekalov, M. Mohageg, V. S. Ilchenko, A. B. Matsko, and L. Maleki, "Hyper-parametric oscillations in a whispering gallery mode fluorite resonator," in Frontiers in Optics 2004/Laser Science XXII/Diffractive Optics and Micro-Optics/Optical Fabrication and Testing, OSA Technical Digest Series (Optical Society of America, 2004), paper FThS5.
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