164W LD侧抽运准连续Nd:YAG/HGTR-KTP高功率绿光激光器

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Mx2=10.46,My2=10.59。结果表明,使用双棒串接、双声光调QV型腔结构,可以获得百瓦级高功率、高光束质量532nm绿光输出。

164W LD side-pumped quasi-continuous-wave (QCW) Nd:YAG/HGTR-KTP green laser

Abstract In order to achieve more than one-hundred watt-green laser pumped by laser diode, two-rod and two Q-switched V-shaped resonator was designed. 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. In this laser system, a Ⅱ-type critical phase-matching HGTR-KTP crystal was adopted as intracavity doubling frequency. When the pump power of two diode lasers was 1200W, 164W quasi-continuous wave 532nm green laser was obtained. The optical-optical conversion efficiency was 13.7%. The beam quality factor was Mx2＝10.46，My2＝10.59。The result shows that one-hundred watt-green laser can be obtained by two-rod and two Q-switched V-shaped resonator configuration.