We propose to fabricate a toroidal dielectric cavity from a periodically poled χ(2) nonlinear material (e.g., LiNbO3) to achieve efficient interaction among high-Q whispering-gallery modes. We show that the periodic poling allows for suppression of both material and cavity dispersion. Such a cavity might be a basic element of a family of efficient nonlinear devices operating at a broad range of optical wavelengths.
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Ilchenko et al. (2003) studied this question.
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