激光近炸引信中由于半导体激光器发射的激光束具有较大不对称的发散角，会导致光束能量发散和作用距离偏近。通过分析半导体激光器的光场特性，结合半导体激光器的远场发散角特点，采用单级非球面透镜对光束进行准直和整形，并利用非球面光学设计理论和Zemax光学设计软件，设计出了激光定距系统单级非球面发射准直透镜。仿真结果表明，设计出的发射系统单级非球面准直透镜，两个方向的发散角分别被压缩至5 mrad和2 mrad，有效提高了半导体激光器发射光束整形质量，减小了发射光束发散角，并增加了系统作用距离。

This paper investigates the problems of the large beam divergence angle and the short detection range in the launch system of laser proximity fuze. By analyzing the semiconductor lasers′ characteristics of the optical field and the characteristics of laser′s far-field divergence angle, according to aspheric optical design theory, single aspheric collimation lens is designed by using Zemax. The simulation results indicate that the laser beam divergences are compressed to 5 mrad and 2 mrad respectively. The quality of the beam shaping increases effectively, and the emission beam divergence angle is reduced as well as the system range is improved.