We demonstrate a stable compact passively Q-switched laser generating 40 μJ, subnanosecond (< 1 ns) duration, 1064 nm pulses at a repetition rate of 10 kHz. With a composite Nd:YAG/Cr⁴⁺:YAG crystal in a simple and compact resonator end-pumped by intense 808 nm pulse, we effectively improve the stability of output laser pulses corresponding to the interpulse amplitude instability less 1% (rms) and the period jitter less 1 μs. These measured pulse-time characteristics agree with numerical simulations and the beam is close to the diffraction limit, with M² < 1.2. The excellent optical properties and structure make this laser to be an attractive source for high-resolution 3D imaging radars or other widespread applications.

我们展示了一个稳定的紧凑型被动Q开关激光器，其产生的脉冲重复频率为10 kHz ，产生40μJ，亚纳秒（< 1 ns）的持续时间，1064 nm脉冲。通过将Nd：YAG / Cr ⁴⁺：YAG复合晶体置于一个简单紧凑的谐振器中，该谐振器通过808 nm强脉冲进行端泵浦，我们有效地提高了输出激光脉冲的稳定性，对应于小于1％（rms）的脉冲间振幅不稳定性和周期抖动小于1μs。这些测得的脉冲时间特性与数值模拟一致，并且光束接近衍射极限，M ² < 1 。2.出色的光学性能和结构使其成为高分辨率3D成像雷达或其他广泛应用的诱人光源。