为了提高皮秒可见光参量产生/放大器(OPG/OPA)的转换效率及输出能量, 采用走离补偿结构和镜片膜系特殊设计等方法进行了实验验证。研究了在不同的抽运能量下OPA信号光的光束质量因子M2的演化过程和信号光在430nm~680nm内的调谐输出性能。结果表明, 在6.9mJ的355nm抽运能量下, 最高获得了2.7mJ的510nm信号光能量输出, 对应的光光转换效率为39.1%, 光子转换效率为56.2%;该方法可以有效提高OPG/OPA的输出能量和转换效率。该研究对紫外和深紫外晶体的表征是有帮助的。

In order to improve conversion efficiency and output energy of a picosecond optical parametric generator/amplifier (OPG/OPA), walk-off compensation structure and special design of lens film system were used to verify the experiment. The evolution of beam quality M2 of OPA signal light at different pumping energies and the tuning output performance of OPA signal light ranging from 430nm to 680nm were studied. The results show that, when pumped by 6.9mJ at 355nm, maximum output energy of 2.7mJ at 510nm signal is obtained. The corresponding optical-optical conversion efficiency is 39.1%. Photon conversion efficiency is 56.2%. This method can effectively improve output energy and conversion efficiency of OPG/OPA. This study is helpful for the characterization of ultraviolet and deep ultraviolet crystals.