中文摘要：

对基于角锥棱镜的非平面单频环行激光器的本征态问题进行了详细讨论，通过参考光线研究了该环形腔的光路闭合情况．腔内允许存在的四个本征椭圆偏振态，由于模式竞争，最终仅存一个本征模式振荡，从而实现单频运转．通过对腔内环路矩阵结构的分析，得出该环形腔中线偏振模式的产生需要系统的光路结构对称．对角锥棱镜的圆柱部分施加磁场，随着磁场的增大，对称光路结构中的本征态结构发生变化，并在适当磁场处出现线偏振模式．

英文摘要：

The eigen state issue of non-planar unidirectional ring laser based on corner-cube prism is discussed,and light trace closure in corresponding cavity via reference ray method is studied. Due to the mode competition,only one of the four eigen elliptic polarized states available in the cavity oscillates and then enforces the unidirectional operation. According to the analysis on the structure of loop matrix, symmetry of light path in the system is necessary for the linear polarization mode operation. With magnetic field applied to the cylindrical part of corner-cube prism, eigen state in the symmetric structure varies as the magnetic field increases ,and becomes the linear polarization in the proper strength of magnetic field.