涡旋光轨道角动量的拓扑荷差值法测量  

Measurement of orbital angular momentum of vortex beam by topological charge difference

作　　者：王华鑫 王彤 熊晗 WANG Hua-xin;WANG Tong;XIONG Han(Key Laboratory of Efficient Low-carbon Energy Conversion and Utilization of Jiangsu Provincial Higher Education Institutions,School of Physical Science and Technology,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]江苏省高校低碳能源高效转化与利用重点实验室、苏州科技大学物理科学与技术学院,江苏苏州215009

出　　处：《中国光学(中英文)》2025年第2期216-223,共8页Chinese Optics

基　　金：“十四五”江苏省重点学科资助项目(No.2021135)。

摘　　要：本文提出一种针对涡旋光轨道角动量的拓扑荷差值检测技术。通过两束拓扑荷不同的涡旋光得到周期性的差值法强度分布图,读取其中一个周期的光斑个数,即可快速准确地计算出待测涡旋光的轨道角动量。相比干涉法和衍射法等需要接收完整涡旋光的传统检测方法,拓扑荷差值法只需接收小部分涡旋光即可进行测量,这在高阶、大尺寸涡旋光测量方面有非常大的优势,在涡旋光的远距离自由空间光通信方面具有潜在应用。We present a topological charge difference detection technique for the orbital angular momentum of vortex beams.In this technique,by utilizing two vortex beams with distinct topological charges,a periodic difference pattern is generated.The orbital angular momentum of the vortex beam to be measured can be quickly and accurately calculated by reading the number of spots in one period.Compared with traditional interference and diffraction methods which require the reception of the complete vortex beam,the topological charge difference method only requires the reception of a small amount of vortex beam to measure.This has significant advantages in the measurement of high-order and large-scale vortex beams,and has potential applications in long-distance free-space optical communication of vortex beams.

关 键 词：涡旋光 轨道角动量 拓扑荷差值 自由空间光通信 

分 类 号：O436.1[机械工程—光学工程]