角锥棱镜的远场衍射特性

角锥棱镜具有空间反射特性，广泛用作激光测距的合作目标，不同的使用情况有不同的精度要求，对用于远距离测距的角锥棱镜其远场衍射特性将直接影响测距效果。通过对角锥棱镜角度误差和面形误差的分析，建立了具有角度误差和面形误差的角锥棱镜的出射波面的波差分布，并按照光波的衍射原理计算具有误差的角锥棱镜的远场衍射图。通过衍射图可以看出出射光束的发散程度随着角度误差的增加而增加，直至完全分离成六束光束。同时，面形误差的增加将导致衍射图的急剧恶化，使出射光束的质量明显降低。角锥棱镜的衍射特性对角锥棱镜的设计和评价具有指导意义。

The Far-Field Diffractive Characteristics of Cube-Corner Prism

Cube-corner prism is widely applied in laser ranging because of its retro-reflective property. The requirements of its precision are different according to applied cases. The far-field diffractive characteristics of cube-corner prism will directly affect long-distance laser ranging. By the analysis of dihedral angle offset and flatness error of cube-corner, the reflective beam wave aberration distribution of cube-corner is presented and the far-field diffractive patterns are computed. The patterns show that divergence of the emerging beam increases with the dihedral angle offset up to completely separate to six beams; the flatness error will result in deterioration of the patterns and debase the quality of the emerging beam. The diffractive characteristics of cube-corner prism provides an evaluation method and approach to design this kind of prism.