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为了有效地补偿激光二极管(LD)侧向抽运1000 Hz重复率电光调QNd:YAG激光器棒状增益介质内存在的热致双折射损耗,设计了一种新颖的双调Q晶体开关复合谐振腔结构。实验结果表明,设计的双调Q晶体开关结构Nd:YAG激光器输出激光脉冲能量比单调Q晶体开关结构的非补偿腔输出能量提高了56％,当侧面抽运半导体激光器输出功率达到450 W时,激光输出达到30 mJ/pulse,输出光束偏振度优于10:1,激光脉冲宽度约14 ns。并获得6．7％的光一光转换效率。通过对双调Q开光激光谐振腔进行建模,并用求解速率方程对其特性进行理论分析,所得的计算结果与实验结果基本吻合。
In order to effectively compensate for the thermal induced birefringence loss in the laser diode (LD) lateral pumping 1000 Hz repetition rate electro-optic QNd: YAG laser rod-like gain medium, a novel double Q-switched crystal resonator structure . The experimental results show that the output laser pulse energy of Nd: YAG laser with double Q-switched crystal structure is 56% higher than that with uncooled cavity of monotonic Q-switched crystal structure. When the output power of side-pumped semiconductor laser reaches 450 W, The laser output reaches 30 mJ / pulse, the output beam polarization is better than 10: 1 and the laser pulse width is about 14 ns. And achieved 6.7% of the light-to-light conversion efficiency. Through the modeling of the double Q-switched laser resonator and the theoretical analysis of its characteristics using the solution rate equation, the calculated results are in good agreement with the experimental results.