Cascaded second-order nonlinearity in an optical cavity

Abstract
Phase-mismatched optical second-harmonic generation in a low-loss external en- hancement cavity is used to generate an efiective third-order nonlinearity for continuous-wave laser radiation. The threshold for optical bistability is calculated. The cascading efiect is demonstrated by detecting bistability of the line shape of a low-loss monolithic MgO:LiNbO3 resonator pumped by a Nd:YAG laser. The simplicity of cascaded ´(2) resonators makes the method particularly promising for quantum optics.

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