Generation of a large orbital angular momentum beam via an optical fiber winding around a curved path and its application  

作　　者：Wei-Han Tan Chao-Ying Zhao Yi-Chao Meng Qi-Zhi Guo 谭维翰;赵超樱;孟义朝;郭奇志(Department of Physics,Shanghai University,Shanghai 200444,China;College of Science,Hangzhou Dianzi University,Hangzhou 310018,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Institute of Fiber Optics,Shanghai University,Shanghai 200444,China)

机构地区：[1]Department of Physics,Shanghai University,Shanghai 200444,China [2]College of Science,Hangzhou Dianzi University,Hangzhou 310018,China [3]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China [4]Institute of Fiber Optics,Shanghai University,Shanghai 200444,China

出　　处：《Chinese Physics B》2021年第10期342-350,共9页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11504074);the State Key Laboratory of Quantum Optics and Quantum Optics Devices,Shanxi University(Grant No.KF202004).

摘　　要：Many papers have been published on the study of orbital angular momentum(OAM)of the laser modes based on the Laguerre-Gaussian(LG)beam and helical phase plate or rotating cylindrical lens,and the principal ray of the LG beam remains straight line.These ways are difficult to get a large OAM modes.In this paper,we propose a novel method to prepare a large OAM modes when the light propagates through a optical fiber winding around a curved path,and establish a theoretical framework based on the principal ray path changing.Firstly,we investigate three kinds of winding structure.Secondly,based on the analytical solutions and numerical calculations,we can find that the spiral body can achieve a large OAM temporal pulse.At the same time,based on the zero OAM diffraction diagram,we can obtain an improvement of resolving power beyond Rayleigh’s criterion.Finally,applying a large OAM diffraction pattern to realize 12-bitencodes,we can obtain a high-security optical information transfer system.

关 键 词：fiber optics orbital angular momentum(OAM) differential Fernet equation Rayleigh criterion 

分 类 号：TN253[电子电信—物理电子学]