研究了一种基于Nd∶YAG/Cr∶YAG复合晶体结构的被动调Q固体微片激光器。以Cr∶YAG可饱和吸收体为被动调Q器件,采用元件一体化设计,输出单脉冲能量为3.5 mJ,脉宽为2.1 ns,峰值功率为1.67 MW,性能指标达到国际同类水平。利用被动调Q激光速率方程,计算了微片激光器的关键参数,脉冲能量的理论值与实验值基本一致。对复合微片激光器元件进行了集成和组装,得到了Nd∶YAG/Cr∶YAG微片激光器原理样机。样机能够成功击穿目标靶附近的空气并产生等离子体,初步满足了作为激光火花塞的技术要求。

A passively Q-switched solid state monolithic laser based on the composite Nd∶YAG/Cr∶YAG crystal is studied. A Cr∶YAG saturable absorber is taken as the passively Q-switched unit and the component integration design is adopted. A laser with output energy of 3.5 mJ, pulse width of 2.1 ns and peak power of 1.67 MW is obtained. The performance factors reach the same level in the world. The key parameters of this monolithic laser are calculated based on the passively Q-switched rate equation, and the theoretical pulse energy value is basically consistent with the experimental value. A prototype of the Nd∶YAG/Cr∶YAG monolithic laser is obtained based on the integration and assembly of the components of a composite monolithic laser, which can successfully breakdown the air near the target and induce plasma. The preliminary requirement as a laser plug is satisfied.