Estimating topological charge of propagating vortex from single-shot non-imaged speckle  

作　　者：Li Chen Rakesh Kumar Singh Aristide Dogariu Ziyang Chen and Jixiong Pu 陈丽;Rakesh Kumar Singh;Aristide Dogariu;陈子阳;蒲继雄(College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China;Department of Physics,Indian Institute of Technology(BHU),Varanasi 221005,Uttar Pradesh,India;CREOL,College of Optics and Photonics,University of Central Florida,Orlando,FL 32816-2700,USA;Fujian Provincial Key Laboratory of Light Propagation and Transformation,Huaqiao University,Xiamen 361021,China)

机构地区：[1]College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China [2]Department of Physics,Indian Institute of Technology(BHU),Varanasi 221005,Uttar Pradesh,India [3]CREOL,College of Optics and Photonics,University of Central Florida,Orlando,FL 32816-2700,USA [4]Fujian Provincial Key Laboratory of Light Propagation and Transformation,Huaqiao University,Xiamen 361021,China

出　　处：《Chinese Optics Letters》2021年第2期75-80,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(No.11674111);Fujian Province Science Funds for Distinguished Young Scholar(No.2018J06017);Fundamental Research Funds for the Central Universities(No.ZQN-PY209);Science and Engineering Research Board(SERB)(No.India-EMR/2015/001613)。

摘　　要：Encoding information using the topological charge of vortex beams has been proposed for optical communications. The conservation of the topological charge on propagation and the detection of the topological charge by a receiver are significant in these applications and have been well established in free-space. However, when vortex beams enter a diffuser,the wavefront is distorted, leading to a challenge in the conservation and detection of the topological charge. Here, we present a technique to measure the value of the topological charge of a vortex beam obscured in the randomly scattered light. The results of the numerical simulations and experiments are presented and are in good agreement. In particular, only a single-shot measurement is required to detect the topological charge of vortex beams, indicating that the method is applicable to a dynamic diffuser.

关 键 词：intensity correlation vortex beam SCATTERING 

分 类 号：O439[机械工程—光学工程]