报道了一种利用激光二极管(LD)双端面泵浦的Nd∶YAG激光晶体, Cr4+∶YAG晶体被动调Q, LBO临界相位匹配腔内倍频的高转换效率的绿光激光器。分析了双端面泵浦YAG激光器的热效应, 实验中LD双端面泵浦, 采用U型平行平面腔结构对Nd∶YAG进行传导冷却。 当总泵浦光为33.8 W时, 得到被动调Q频率10 KHz、功率8.21 W的线偏振基频光输出。6.72 W的绿光输出的倍频效率为86%, 输出光束为基模, M2为1.4。实验表明双端面泵浦YAG倍频激光器具有很高的转换效率。

A high efficiency all-solid-state green laser was reported which was double end-pumped by the laser diode(LD) Nd∶YAG, passive Q-switched by Cr4+∶YAG, and critical phase matched by LBO intracavity. The thermal effect of double end-pump YAG laser was analyzed. In the experiment, double end-pump of LD is used to conduct the conduction cooling of Nd∶YAG with the U-type parallel flat cavity structure. When the input power is 33.8 W, the output power of linear polarized light with 10 kHz passive Q-switch is 8.21 W which leads to the output power instability of 6.72 W and frequency doubling efficiency of 86%. The output beam is the fundamental model and M2 reaches 1.4. The experiments show that the double end-pumped YAG frequency multiplication laser has quite high conversion efficiency.