以CrYAG作为可饱和吸收体，实现了激光二极管(LD)端面抽运NdGdVO4晶体的微片式被动调Q激光器。NdGdVO4晶体的尺寸为3 mm×3 mm×1 mm，a向切割，Nd3+掺杂原子数分数为0.5 %，抽运端面镀有对808 nm增透和对1.06 μm高反的双色膜，作为激光谐振腔的输入镜。Cr4+YAG的尺寸为 9.5 mm×1.1 mm，初始透射率为77%，其外端面镀有对1.06 μm透射率为15%的部分反射膜，作为激光谐振腔的输出镜。谐振腔的长度为5~6 mm。激光的抽运阈值为4.62 W，当抽运功率为13.86 W时，最大平均输出功率为0.98 W，相应的光光转换效率为7%，斜率效率为9.5 %，最高重复频率、最大单脉冲能量和最短脉冲宽度分别为23.4 kHz，44.6 μJ和2.9 ns，相应的峰值功率为15.4 kW。

With CrYAG as the saturable absorber, passively Q-switched microchip laser is obtained by laser diode (LD) end-pumped NdGdVO4 crystal. The NdGdVO4 crystal is a-cut with the size of 3 mm×3 mm×1 mm, and the atom fraction of Nd3+ ions is 0.5%. The pump end face of NdGdVO4 crystal is anti-reflective coated for 808 nm and high-reflective coated for 1.06 μm, which serves as the input mirror of laser cavity. The size of Cr4+YAG is 9.5 mm×1.1 mm, the initial transmission is 77%, and its outer end face is partially reflective coated for 1.06 μm (T=15%), which serves as the output mirror of laser cavity. The total length of laser cavity is 5~6 mm. The pump threshold of the laser is 4.62 W. When the pump power reaches 13.86 W, a maximum average output power of 0.98 W is obtained, corresponding to optical conversion efficiency of 7%, and slope efficiency of 9.5%. The highest repetition rate, largest pulse energy and shortest pulse width are measured to be 23.4 kHz, 44.6 μJ, and 2.9 ns respectively, corresponding to peak power of 15.4 kW.