为了研究百瓦级高光束质量绿光激光器,采用激光二极管侧面抽运双棒串接、双声光调Q的方法,依据光束传输矩阵,分析比较了V 型折叠腔内分别置入单、双激光晶体时,其热透镜效应对谐振腔稳定性、折叠臂内光场分布以及倍频晶体处子午光斑和弧矢光斑大小的影响,倍频晶体选用具有抗灰迹特性的Ⅱ类临界相位匹配KTP晶体。当总抽运功率为1200W、重复频率为27.2kHz时,得到了脉冲宽度为130ns的164W准连续绿光输出,光光转换效率为13.7%,光束质量因子M2x＝10.46,M2y＝10.59。结果表明,使用双棒串接、双声光调Q V型腔结构,可以获得百瓦级高功率、高光束质量532nm绿光输出。

In order to investigate more than one hundred Watt green laser,two serial rods pumped by laser diodes and two Q-switched V-shaped resonators were used.Based on the transmission matrixes,when single and double rods were placed in the cavity respectively,the stable condition of cavity,the light distribution in the folded arm,along with the sagittal and tangential spot size on the nonlinear crystal influenced by the thermal lens effect were analyzed and compared.A high gray tracking resistivity(HGTR)-KTP crystal with type Ⅱ critical phase-matching was adopted as intracavity frequency doubler.When the pump power of two diode lasers was 1200W and the repetition rate was 27.2kHz,164W green laser with the pulse width of 130ns was obtained.The optical-optical conversion efficiency was 13.7%.The beam quality factor was M2x＝10.46,M2y＝10.59.The result shows that one hundred Watt green laser could be obtained in the two-rod and two Q-switched V-shaped resonator configuration.