中国光学（中英文）2025，Vol.18Issue(4)：803-810,8.DOI:10.37188/CO.2024-0209
涡旋光束轨道角动量的十字线检测法
Crosshair detection method for orbital angular momentum of vortex beams
摘要
Abstract
In this paper,a method for vortex beam OAM detection using crosshair diffraction is proposed.The OAM-related main bright spot in the far-field distribution contains most of the energy of the incident beam(50％～84％)and there is no secondary bright spot that interferes with the detection.In contrast,the en-ergy proportion of the main bright spot in the conventional small-hole diffraction method is extremely low,particularly in the far-field main bright spot above the 7th-order topological charge,which contains less than 1％of the energy of the incident beam.Furthermore,as the topological charge level increases,the secondary bright spot becomes more intrusive.Consequently,crosshair measurements are particularly applicable to the detection of weak vortex beams,which has potentially important implications for the development of long-range free-space optical communications.关键词
衍射/涡旋光束/轨道角动量/拓扑荷Key words
diffraction/vortex beam/orbital angular momentum/topological charge分类
数理科学引用本文复制引用
王彤,熊晗,王华鑫,来右丽..涡旋光束轨道角动量的十字线检测法[J].中国光学（中英文）,2025,18(4):803-810,8.基金项目
十四五"江苏省重点学科资助(No.2021135) （No.2021135）
Supported by Jiangsu Key Disciplines of the Fourteenth Five-Year Plan(No.2021135) （No.2021135）
