报道了一种可宽温稳定工作的高峰值功率亚纳秒被动调Q的Nd∶GdVO4激光器。激光振荡级采用平凹腔结构，以尾纤耦合半导体激光器端面抽运Nd∶GdVO4晶体，以Cr4+∶YAG作为可饱和吸收体进行被动调Q。在抽运吸收能量为5.9 mJ时，振荡级输出峰值功率为1.5 MW,脉冲宽度为600 ps的脉冲激光，单脉冲能量为0.9 mJ，光-光转换效率为15.4%，光束发散角为1.2 mrad。采用端面抽运的双程放大结构对振荡级输出激光进行放大，最终得到峰值功率为3.5 MW，单脉冲能量为2.1 mJ激光输出。测量了不同温度下的激光能量的变化，结果表明,在20~36 ℃的温度范围内，激光输出能量的抖动量(均方根)为5%。激光器结构紧凑、功耗低，可作为未来空间激光应用的光源。

A high peak power, sub-nanosecond passively Q-switched Nd∶GdVO4 laser with wide temperature stability is presented. The oscillator adopts a flat-concave cavity structure with pigtail coupling of semiconductor laser diode, and takes Cr4+∶YAG as saturable absorber. When the pump absorption energy is 5.9 mJ, the output peak power of the oscillation is 1.5 MW, with pulse width of 600 ps and pulse energy of 0.9 mJ. The efficiency of light to light conversion is 15.4%. The divergence angle is 1.2 mrad. An end pumped double pass amplifier is used and the output peak power of 3.5 MW with pulse energy of 2.1 mJ is achieved. The output laser energies at different temperatures are measured. The results show that the jitter of laser output energy (root-mean-square) is 5% when the temperature is in the range of 20-36 ℃. The laser has compact structure and low power consumption, which can be used as light source for future space laser applications.