| Citation: | WANG Hua-xin, WANG Tong, XIONG Han. Measurement of orbital angular momentum of vortex beam by topological charge difference method[J]. Chinese Optics. doi: 10.37188/CO.2024-0141
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This paper presents a topological load difference detection technique for the orbital angular momentum of vortex beams. Two vortex beams with different topological charges obtained the periodic intensity distribution. The orbital angular momentum of the vortex beam to be measured can be quickly and accurately calculated by reading the number of spots in one period. The traditional interference and diffraction methods need to receive the complete vortex beam. In contrast, the topological charge difference method only needs to receive a small amount of vortex beam to measure. This has great advantages in the measurement of high-order and large-scale vortex beams. It has potential applications in long-distance free-space optical communication of vortex beams.
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