基于周期极化铌酸锂(PPLN)晶体提出并设计了一种高效紧凑腔内倍频绿光激光器。该激光系统采用808 nm激光二极管(LD)端面直接抽运Nd∶YVO4晶体，进而利用极化周期为7 μm 的PPLN 晶体倍频产生532 nm 绿光。通过在Nd∶YVO4和PPLN 晶体端面镀膜构成激光腔镜，无需采用任何光学透镜、反射镜等分立光学元件，大大降低了系统体积和成本。实验结果显示，当激光器谐振腔腔长为12 mm，抽运功率为4.1 W 时，绿光输出功率可达1.343 W，相应的光-光转换效率达32.8%。当LD 抽运功率稳定在3.33 W 时，2 h内的绿光输出功率波动小于5%。

A compact and highly efficient intracavity frequency- doubled green laser has been researched and designed based on periodically poled lithium niobate (PPLN) crystal. The laser system adopts a 808 nm laser diode (LD) end directly pumped Nd∶YVO4 crystal, then uses a poling period of 7 mm of PPLN crystal to generate 532 nm green light by frequency-doubling. The coating Nd∶YVO4 and PPLN crystals compose a laser cavity, without using any discrete optical components such as optical lens, reflector, thus reducing the volume and cost of the system. The experimental results show that with the resonator cavity length being set at 12 mm, pump power at 4.1 W, the green light output power of 1.343 W and the corresponding optical- optical conversion efficiency of 32.8% are achieved. Controlling the incident pump power at about 3.33 W, the fluctuation of green light output power within 2 h is less than 2%.