利用角双缝干涉测量涡旋光束拓扑荷综述

Survey on detecting the topological charge of vortex beams with angular-double-slit interference

光子轨道角动量具有高维特性和光学涡旋特性,在经典和量子信息领域都有着巨大的应用潜力。当携带轨道角动量的涡旋光束经过角双缝时,由于相位差的存在,远场的干涉图样有明暗交替变化的现象。基于这个性质,可利用角双缝干涉测量拉盖尔-高斯光束、贝塞尔光束及完美涡旋光束的拓扑荷。角双缝干涉方法还可以清楚地揭示涡旋光束的螺旋相位结构。文章详细介绍了利用角双缝干涉测量涡旋光束拓扑荷的实验原理、实验装置、实验结果及现阶段相关的研究成果。

The orbital angular momentum of photons characterizes both high dimensions and optical vortices and shows a great of potential applications in classical and quantum fields.When a vortex beam with the orbital angular momentum passes through angular double slits,the interference pattern changes alternatively between destructive and constructive due to their phase difference.Based on this property,the topological charge of Laguerre-Gaussian beams,Bessel beams and perfect optical vortex beams can be clearly revealed in the angular-double-slit interference.The spiral phase structure of a vortex beam can be clearly revealed in angular-double-slit interference,and it gives us an efficient way to detect the topological charge of vortex beams.In this review article,we review the experimental principle,experimental setup,experimental results and current research status of the method.