Evolution of the Phase Singularity of an Orbital Angular Momentum Beam with an Astigmatism Phase

Author:

Liang Chunhao12,Zheng Cuiling12,Lian Xinru12,Chen Qian12,Gao Yaru12ORCID,Liu Jinsong12,Cai Yangjian12,Zeng Jun12ORCID

Affiliation:

1. Shandong Provincial Engineering and Technical Center of Light Manipulation & Shandong Provincial Key Laboratory of Optics and Photonics Devices, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China

2. Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China

Abstract

In this study, we explore the impact of the astigmatism phase on the evolution of the phase singularity of an orbital angular momentum (OAM) beam propagating through free space. The results demonstrate that the high-order phase singularity dispersed into a cluster of individual unit phase singularities owing to the astigmatism phase. The number of singularities equaled the topological charge of the OAM beam. By adjusting the astigmatism phase, we could manipulate and control the evolution of the phase singularities, including their displacements and rotation angles. These findings offer significant prospects for customizing 3D vortex lines, optical topologies, and applications involving topological charge measurement, information encoding, and transfer.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Qingchuang Science and Technology Plan of Shandong Province

China Postdoctoral Science Foundation

Natural Science Foundation of Shandong Province

Publisher

MDPI AG

Subject

Radiology, Nuclear Medicine and imaging,Instrumentation,Atomic and Molecular Physics, and Optics

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