利用LD直接端面泵浦技术实现的固体激光器，能很好地适用于复杂的机载环境，在工程应用上具有重要的研究价值，研究高效率LD直接端面泵浦技术的设计方法，能获得高光光转化效率的静态激光输出，对后续实现高能量的LD端泵激光光源具有重要的指导意义。针对一种纵向均匀排布的20 Bar LD阵列，利用ZEMAX软件仿真并设计了两种四棱柱光学耦合系统，将端泵阵列的泵浦光通过耦合系统聚焦至工作物质内，两种耦合系统的光束焦点位置各不相同，通过改变聚焦焦点的位置，研究了不同状态下激光能量输出情况。经实验结果可知，针对此平-平腔构型，工作物质（1at%）4 mm×4 mm×10 mm的结构尺寸下，设计泵浦光均匀照射工作物质前端面，焦点距离工作物质前端面为5.5 mm，此时，泵浦光与振荡光的模式匹配程度最高，在此状态下LD直接端面泵浦固体激光器的最大光光转化效率能高达40%。

The solid-state laser generated by using the LD direct end-surface pumping technology can be used in complex airborne environments, and it has high research value in engineering application. The static laser output with high light conversion efficiency can be obtained through the successful study of the design method of the high-efficiency LD direct end-surface pumping technology, which is of great significance to the subsequent realization of the high-energy LD end-surface pumping laser illuminant. This paper focuses on a kind of 20 Bar LD array with vertical and even distribution, and two kinds of optical coupling systems of quadrangular prism are simulated and designed by using ZEMAX software. The pump light of the end-surface pumping array is focused into the working substance by using the coupling system.The beam focusing positions of the two coupling systems are different.By changing the focusing position, the output status of laser energy in different states is studied. The experiment goes as follows:in view of this flat-flat cavity configuration and with the size of the working material (1at%) being 4 mm×4 mm×10 mm, the pump light is designed to evenly illuminate the front surface of the working material and the distance from the focus to the front surface of the working material is designed to be 5.5 mm.The result shows that at this timethe mode matching degree between the pump light and the oscillation light is the highest, in which state the maximum light conversion efficiency of the LD direct end-surface pumping solid-state laser can be as high as 40%.