Abstract
By using multiple crystals of periodically poled lithium niobate arranged in a fan-fold configuration with mirrors between the crystals to periodically refocus the light and retroreflect it after the final crystal, one can achieve very long interaction lengths and efficient frequency conversion at low input power. We present the theory and numerical simulations of devices using this concept, including devices for singly resonant optical parametric oscillation and second-harmonic generation. We find quantitative agreement between plane-wave analysis of these devices and numerical simulations in three spatial dimensions.
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