Increasing the conversion efficiency of second harmonic generation (SHG) is an area of interest in research. We report a high-efficiency 532 nm laser generation, with a conversion efficiency of 94.04 0.115% from the pump depletion of 98.1% 0.1%, by accurately quantifying the round-trip loss and the transmissivity of the input mirror using our proposed scheme. The optimal conversion efficiency of the cavity-enhanced frequency doubling process is independent of the waist and is determined by the pump depletion, round-trip loss, and transmissivity of the input mirror. These results show that the cavity-enhanced frequency doubling process is not necessary to set the focusing parameter at the optimal single-pass conversion. These results provide a guide for future research on high-efficiency SHG.

提高二次谐波产生（SHG）的转换效率是研究的关注领域。我们报告了一种高效的532 nm激光生成，通过使用我们提出的方案精确量化往返损耗和输入镜的透射率，转换效率为94.04 0.115％，泵浦损耗为98.1％0.1％。腔增强倍频过程的最佳转换效率与腰部无关，并取决于泵浦损耗，往返损耗和输入镜的透射率。这些结果表明，不必在最佳单程转换中将聚焦参数设置为腔增强倍频过程。这些结果为今后对高效SHG的研究提供了指导。