光学学报, 2008, 28 (8): 1543, 网络出版: 2009-08-31
激光二极管侧抽运双棒串接准连续Nd∶YAG高功率绿光激光器
Laser-Diode Side-Pumped Two Rods Quasi-Continuous-Wave Nd∶YAG Green Laser
摘要
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。
Abstract
A laser diode (LD) side-pumped two rods quasi-continuous-wave (QCW) Nd∶YAG green laser has been demonstrated. The influence of thermal birefringence effect is analyzed. Considering the compensation, a heat-stablized cavity is designed. In the experiment, two sequent Nd∶YAG rods side-pumped by 30×20 W laser diodes array and type-Ⅱ critical phase-matched HATR-KTP crystal are used. The spot sizes on rod B as a function of pumping current before and after compensation are simulated. The green laser output power of 164 W has been measured at single laser diode pumping current 21.6 A, with the repetition rate of 27.2 kHz, pulse width of 130 ns, optical-to-optical conversion efficiency of 13.7%, beam quality factors of M2x=9.52, M2y=9.86, and output power fluctuation of 2.3%. The results show that the system can work at wide stable range after the compensation of the thermal birefringence effect.
冯忠耀, 李成荣, 李修, 汪俊, 白晋涛. 激光二极管侧抽运双棒串接准连续Nd∶YAG高功率绿光激光器[J]. 光学学报, 2008, 28(8): 1543. Feng Zhongyao, Li Chengrong, Li Xiu, Wang Jun, Bai Jintao. Laser-Diode Side-Pumped Two Rods Quasi-Continuous-Wave Nd∶YAG Green Laser[J]. Acta Optica Sinica, 2008, 28(8): 1543.