中文摘要：

用光线追迹的方法，理沦推导了透镜导管各参数优化的一般公式，给出了优化参数；在此基础上，模拟了导管内光线的传输，统计了透镜导管出射光束的强度分布，讨论了各参数对耦合效果的影响。依据理论优化的结果，设计加工了透镜导管并进行了耦合实验，测量了输出光束的强度分布，给出了光斑图像。实验测得耦合效率高于91％，输出光束强度分布平滑均匀，光斑质量良好，与理论模拟吻合并优于以往的研究结果。

英文摘要：

Based on the numerical analysis of ray tracing, the general expressions of the parameters in optimization design of the lens duct were theoretically deduced. Using the theoretical model, the light transmission trace in the duct was simulated, and the light intensity distribution of the output beam was calculated. The influence of the parameter＇s value on the coupling effect was also analyzed. Based on the optimum designing, a lens duct was fabricated and applied to a laser system, and the coupling experiment was implemented. The experimental results show that a smooth and symmetric beam with a good quality can be obtained at the output duct end. The coupling efficiency of the lens duct is above 91%. The results of the experiment agree well with the theoretical analysis, and are better than the results reported previously.