为了制备高质量涡旋光, 对基于Sagnac干涉仪的涡旋光制备方法进行了理论分析、改进设计和实验验证.介绍了高斯光束叠加和附加相位差π产生的原理, 在分析干涉回路对横向剪切量影响的基础上, 搭建了基于Sagnac干涉仪的涡旋光制备装置, 给出了搭建实验平台的相关注意事项, 并利用本方法分别制备出拓扑荷数为＋1、－1的涡旋光.涡旋光在不同传播距离下拓扑荷数始终保持为＋1或－1.基于光斑可调的改进实验装置可有效提高涡旋光质量.

In order to generate high-quality optical vortices, this paper presents theoretical analysis, improved design and experimental demonstration of a novel approach for optical vortex generation based on Sagnac interferometer. The additional phase difference π is introduced, based on analyzing the influence of the interference loop on the shear amount, a optical vortex generation setup on the basis of a Sagnac interferometer is built, then the related considerations are given and optical vortices of topological charge +1 and －1 are generated respectively. The intensity distribution and interference patterns at various propagation distance are experimentally recorded and analyzed with topological charge keeping +1 and －1. The improved setup can generate optical vortices with higher quality.