期刊
CHINESE OPTICS LETTERS
卷 19, 期 2, 页码 -出版社
OSA-OPTICAL SOC
DOI: 10.3788/COL202119.022603
关键词
intensity correlation; vortex beam; scattering
类别
资金
- National Natural Science Foundation of China (NSFC) [11674111]
- Fujian Province Science Funds for Distinguished Young Scholar [2018J06017]
- Fundamental Research Funds for the Central Universities [ZQN-PY209]
- Science and Engineering Research Board (SERB)
A technique to measure the topological charge of vortex beams, particularly applicable to dynamic diffusers, is proposed. Numerical simulations and experimental results demonstrate the effectiveness of the technique.
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.
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