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研制一台激光二极管(LD)侧面抽运双棒串接准连续Nd∶YAG折叠腔高功率绿光激光器,理论分析了热致双折射效应对系统的影响,并对用石英旋转片补偿前后的情况进行模拟对比。在考虑了补偿后的情况下设计了热稳定谐振腔。实验中采用两个串接的由30个20 W的LD阵列侧面抽运的Nd∶YAG棒和Ⅱ类临界相位匹配HGTR-KTP晶体,在抽运电流均为21.6 A,重复频率为27.2 kHz时,获得了最大平均输出功率为164 W,脉冲宽度为130 ns的532 nm绿光输出,光-光转换效率为13.7%,测得光束质量因子为M2x=9.52,M2y=9.86,不稳定度为2.3%。实验结果显示,经补偿后的激光系统能在宽的稳区范围内稳定运转。
A laser diode (LD) side-pumped double-rod serial quasi-continuous Nd:YAG folded cavity high power green laser was developed. The influence of thermal induced birefringence on the system was theoretically analyzed. The situation is simulated comparison. A thermally stable resonator was designed considering the compensation. Two serially connected Nd:YAG rods and Ⅱ-phase critical phase matching HGTR-KTPs, which were side-pumped by 30 20 W LD arrays, were used in the experiment. When the pumping current was 21.6 A and the repetition frequency was 27.2 kHz , The maximum output power of 164 W and the pulse width of 130 ns at 532 nm were obtained. The light-to-light conversion efficiency was 13.7%. The measured beam quality factors were M2x = 9.52 and M2y = 9.86. The instability was 2.3%. Experimental results show that the compensated laser system can operate stably over a wide range of stability.