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Efficient frequency doubling by a phase-compensated crystal in a semimonolithic cavity

机译：半整体腔中相位补偿晶体的有效倍频

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摘要

In multiple-pass nonlinear frequency conversion devices, interacting waves may accumulate different phases, owing to dispersive elements in the system. Phase compensation is therefore necessary for efficient frequency conversion. We experimentally demonstrate phase compensation in a compact semimonolithic frequency-doubling cavity by using a periodically poled KTP crystal. The conversion efficiency of the crystal was found to decrease at high pump powers, owing to power-dependent thermal lensing. This experimental observation was supported by a theoretical calculation of the conversion efficiency in a cavity, considering the mismatch between the mode's thermally loaded and unloaded cavities. A design procedure was also presented to compensate for the thermal lensing effect. The highest conversion efficiency of 56.5%, corresponding to a second-harmonic power of 117.5 mW at 532 nm, was achieved with a cw Nd:YAG pump power of 208 mW.
机译：在多通道非线性频率转换设备中，由于系统中的色散元件，相互作用的波可能会累积不同的相位。因此，相位补偿对于有效的频率转换是必需的。我们通过使用周期性极化的KTP晶体实验证明了紧凑的半单倍频腔中的相位补偿。由于功率依赖的热透镜，发现在高泵浦功率下晶体的转换效率降低。考虑到模式的热加载腔和未加载腔之间的不匹配，该实验观察得到了腔中转换效率的理论计算的支持。还提出了一种设计程序来补偿热透镜效应。使用208 mW的Cw Nd：YAG泵浦功率实现了56.5％的最高转换效率，对应于532 nm处的117.5 mW的二次谐波功率。

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