The laser with Porro prism resonator cavity has goog stability,and this structure has been widely used in military lasers.The polarization coupling property of Porro prism was theoretically analyzed.The relationship of differ-ent phase shift wave plate azimuth angles and polarization transmissivity was calculated by MATLAB software,and the change of polarization state was simulated in the process of optical coupling.Coupling properties of Porro prism with different materials were compared,and the results were verified through the experiments.This study has practical sig-nificance for the design of Porro prism resonator cavity and the selection of Porro prism materials.%激光器采用直角棱镜腔具有较好的稳定性，在军用激光器中应用广泛，由于直角棱镜内发生全反射产生相移，耦合输出透过率与耦合波片的相移量、光轴方位角，以及直角棱镜材料和棱线方向有关，直角棱镜与波片的不同组合能够达到的最高耦合透过率不同；对直角棱镜偏振耦合特性进行了理论分析，并采用 MATLAB 软件计算不同相移波片的方位角与偏振透过率的关系，并对光波耦合过程中偏振状态变化进行了模拟，对不同材料直角棱镜的耦合特性进行了对比，并根据理论分析进行实验验证，这些研究对直角棱镜谐振腔的设计、调试以及直角棱镜材料的选择具有实际意义。
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