微柱阵列和透镜导管组成的耦合系统在激光二极管阵列(LDA)抽运的全固态高能量激光器中起着重要的作用，其光束耦合性能直接影响激光器的最终输出能量和光束质量。为了设计微柱阵列和透镜导管耦合系统的最佳结构参数，需要研究抽运光在耦合系统内部以及在激光晶体端面的分布。利用几何光学理论，对LDA的发射光线经微柱阵列和透镜导管的传输进行三维空间追迹，并计算其能量传输效率和光束整形效果。比较了六面体导管和渐细圆台形导管的耦合性能。仿真分析结果表明，六面体导管需要长度较大，能量传输效率略高，而圆台形导管可以较短，耦合整形后的光斑更接近圆形。

The coupling system consisting of microcylinders and lens duct is an important part of high power all-solid-state lasers. Its coupling performance has direct influence on the laser′s output power and beam quality. The rays distribution inside the system and on the lasering crystal surface should be studied to optimize the coupling system′s structural parameters. Utilizing a 3D ray-tracing method, the real spatial lights propagating through mocrocylinders and lens duct are traced and the energy transfer efficiency and light distribution are calculated. The coupling characteristics of a hexahedral lens duct and a tapered lens duct are compared. The results show that the hexahedral lens duct needs a bigger length and can achieve higher energy coupling efficiency, while the tapered lens duct can get the light distribution closer to round and the length can be very short.