Probing the fractional topological charge of a vortex light beam by using dynamic angular double slits

作     者：Jing Zhu Pei Zhang Dongzhi Fu Dongxu Chen Ruifeng Liu Yingnan Zhou Hong Gao Fuli Li 

作者机构：Laboratory of Quantum Information and Quantum Optoelectronic Devices Shaanxi ProvinceXian Jiaotong University Key Laboratory of Quantum Information University of Science and Technology of ChinaChinese Academy of Science 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2016年第4卷第5期

页      面：187-190页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Fundamental Research Funds for the Central Universities National Natural Science Foundation of China(NSFC)(11374008,11374238,11374239,11534008) 

主　　题：Probing the fractional topological charge of a vortex light beam by using dynamic angular double slits 

摘      要：Vortex beams with fractional topological charge(FTC) have many special characteristics and novel ***, one of the obstacles for their application is the difficulty of precisely determining the FTC of fractional vortex beams. We find that when a vortex beam with an FTC illuminates a dynamic angular double slit(ADS), the far-field interference patterns that include the information of the FTC of the beam at the angular bisector direction of the ADS vary periodically. Based on this property, a simple dynamic ADS device and data fitting method can be used to precisely measure the FTC of a vortex light beam with an error of less than 5%.