Effect of spatial coherence on determining the topological charge of a vortex beam

被引：46
|
作者：
Zhao, Chengliang [1 ]
Wang, Fei [1 ]
Dong, Yuan [1 ]
Han, Yujing [2 ]
Cai, Yangjian [1 ]
机构：
[1] Soochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China
[2] Heze Univ, Dept Phys, Heze 274015, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2012年 / 101卷 / 26期
基金：
中国国家自然科学基金;
关键词：
LAGUERRE-GAUSSIAN BEAMS; FRACTIONAL FOURIER-TRANSFORM; ORBITAL ANGULAR-MOMENTUM; LASER MODES; LIGHT; VORTICES; ORDER;
D O I：
10.1063/1.4773236
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
It is known that one can determine the topological charge of a vortex beam based on the Fourier transform of its intensity. We demonstrate both theoretically and experimentally that this method will be invalid for determining the topological charge of a vortex beam with low coherence. Furthermore, we propose a method to determine the topological charge of a vortex beam with low coherence based on its complex degree of coherence. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4773236]
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页数：5
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