半导体激光器由于其光电转换效率高、亮度高、寿命长等特点，是用于抽运固体激光器的最佳选择。作为抽运源，要求半导体激光器具有很好的光学性能，主要包括出射光束的发散角和指向性。半导体激光器的发散角很大，要对其进行光束压缩整形并控制光束的指向性是一项很难的技术，对于多个半导体激光器组成的叠阵要保证其每一个巴条的光学性能良好更是不容易做到。从研究半导体激光器光束质量的控制着手，制作出一个带快轴准直的60个巴条的激光器叠阵，其峰值功率高达18 kW，叠阵整体快轴发散角小于0.2°(3.5 mrad)，每个巴条的指向性在±0.15°(±2.6 mrad)以内。

With the advantages of high efficiency, high power, long lifetime, etc., laser diode is the best option for pumping of solid state lasers. As for the pumping, good optical performances which include beam divergence and pointing of laser diode are required. Because the divergence of laser diode bar at fast axis is very large, it is a hard work to collimate the beam and control the pointing of a bar, even harder to build a stack with good optical performance. Method of controlling beam quality of laser diode bar is studied, and a laser diode stack with 60 fast axis collimated bars is build up, the peak power of the stack is 18 kW, the total divergence (on fast axis) of the stack is less then 0.2° (3.5 mard), the pointing of each bar is within ±0.15° (±2.6 mrad).