光学学报, 2019, 39 (1): 0126017, 网络出版: 2019-05-10   

涡旋光束轨道角动量检测及其性能改善 下载: 2050次

Orbital Angular Momentum Measurement of Vortex Beam and Its Performance Improvement
作者单位
西安理工大学自动化与信息工程学院, 陕西 西安 710048
摘要
利用光栅检测涡旋光束轨道角动量(OAM)并进行性能改善的方法容易实现且能降低通信系统成本。将涡旋光束照射到周期渐变光栅和环形光栅的合适位置,观察衍射图中光斑的分布规律,并对入射涡旋光束进行检测。实验结果表明,通过判断光斑中暗条纹的数量和朝向便可确定入射涡旋光束的拓扑荷的大小和正负,利用相位校正技术或光束复制技术可以使衍射结果中的条纹更加清晰,使用这两种技术后可将检测到的拓扑荷数提高至30。该研究为OAM复用通信中的解复用和涡旋光的产生提供了依据。
Abstract
The orbital angular momentum (OAM) of a vortex beam is measured and its performance is improved by gratings. Compared with other equipment or devices, this measurement method by gratings is simple and can make the cost of communication system reduced. The vortex beam is illuminated to an appropriate position of a period-gradually-changing grating or an annular grating. The light spot distribution in the diffraction pattern is observed and the incident vortex beam is measured. The experimental results show that the size and plus-minus of the topological charge of incident vortex beam can be determined according to the number and orientation of dark stripes in the light spot. Meanwhile, the phase correction or fan-out technique can be adopted to make the stripes more clearly visible in the diffraction results. Moreover, with these two techniques, the measured maximum number topological charges is increased to 30. This research provides a basis for the demultiplexing and generation of vortex beams in the OAM multiplexing communication.

柯熙政, 谢炎辰, 张颖. 涡旋光束轨道角动量检测及其性能改善[J]. 光学学报, 2019, 39(1): 0126017. Xizheng Ke, Yanchen Xie, Ying Zhang. Orbital Angular Momentum Measurement of Vortex Beam and Its Performance Improvement[J]. Acta Optica Sinica, 2019, 39(1): 0126017.

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