用周期极化KTP晶体高效倍频获得稳定461 nm激光

Stable Second Harmonic Generation 461 nm Blue Radiation by PPKTP Crystal

实验采用准相位匹配的PPKTP晶体对922 nm连续激光进行外腔谐振倍频,获得稳定461 nm激光。实验装置采用一体化环形腔设计,实现最大耦合转换效率达73.3%,获得208 mW的4 61 nm蓝光输出。实验结论中通过分析,修正损耗误差,得到最佳耦合腔镜反射率,并深入讨论了耦合腔镜的两种反射率对倍频输出功率和效率的影响,同时就晶体吸收效应和热透镜效应对倍频试验的影响也进行了深入研究。

The experiment presents an external ring cavity for frequency doubling, which is used to generate 461 nm blue radiation, with PPKTP as a laser frequency doubling crystal. By the incorporate ring cavity and the locking circuit system, the output power of 461 nm reaches the maximum. More than 208 mW of the second harmonic generation is gotten from 350 mW IR input power in the experiment. The coupling conversion efficiency is 73.3 %. By analyzing and amending the loss error the reflectivity of coupling mirror is optimized. The effect of two different reflectivity coupling mirrors, PPKTP crystal＇s linear absorption effect and thermal lens effect are discussed.