用激光原理和晶体光学原理分析了腔内加旋光晶体的激光器输出光的偏振特性。实验和分析表明：激光器输出两束不同频率的垂直线偏振光；激光器两端输出光的偏振面有一夹角α，且此夹角与晶轴和传光方向的夹角θ有关。理论计算结果与在双折射双频激光器的实验结果符合很好。 The polarization characteristics of laser output light with intracavity gyro crystals were analyzed by laser principle and crystal optics principle. Experiments and analysis show that the laser outputs two perpendicular linearly polarized lights of different frequencies. The polarization plane of the output light at both ends of the laser has an angle α, which is related to the included angle θ between the crystal axis and the transmission direction. The theoretical calculation results are in good agreement with the experimental results at birefringence dual-frequency laser.