在研究了大功率半导体激光器(HPLD)光束特性的基础上，提出了实现大功率半导体激光束变发散角的设计方法。针对线源像散激光光源设计了由两个垂直放置的平凸柱透镜组成的可变激光束发散角的整形系统。在满足光束发散角要求的前提下，通过离焦使其出射光束的发散角在一定范围内连续改变。建立了两个柱透镜移动量与光束发散角关系的数学模型。利用商用光学软件对整形系统进行了模拟，结果表明，光束发散角被压缩在一定范围内连续改变，从而可实现对不同范围物体照明。

On the basis of studying the beam characteristics of high power diode laser (HPLD), variable beam divergence design method for high power diode laser is presented. A variable beam divergence shaping system with two plane-convex cylindrical lenses perpendicular to each other for extended astigmatic source is designed. This system can obtain the required beam divergence and change it in a certain range by defocusing. A mathematical model between motion quantity and beam divergence is set up. The results simulated by commercial optical design software show that this system can reduce the beam divergence and change it continually in a certain range. The transformed beam can illuminate different area objects.