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用一个780 nm的光栅外腔反馈半导体激光器作为泵浦源,使用环形腔和一块I型的一阶准相位晶体实现了780 nm的腔增强倍频.计算基频光波长与晶体最佳匹配温度的关系,实验测得基频光波长为781.12 nm和781.79 nm时的最佳匹配温度.通过合理的腔型设计及参数选择,获得390 nm紫光的连续波输出.整个环形腔通过Pound-Drever-Hall方法来锁定.在基频光的功率为88 mW时,获得了紫光的最大输出功率为4.3 mW,倍频转换效率为4.9%.
A 780 nm grating external cavity feedback semiconductor laser was used as the pump source to achieve a 780 nm cavity doubling frequency using a ring cavity and a type I first-order quasi-phase crystal. The fundamental wavelength and the crystal best matching temperature The optimal matching temperature was obtained when the fundamental wavelength of light was 781.12 nm and 781.79 nm respectively.The CW output of 390 nm violet light was obtained by proper cavity design and parameter selection.The whole annular cavity was identified by Pound-Drever- Hall method to lock in. When the power of the fundamental light is 88 mW, the maximum output power of the violet light is 4.3 mW, and the frequency doubling efficiency is 4.9%.