期刊
CHINESE OPTICS LETTERS
卷 20, 期 12, 页码 -出版社
Optica Publishing Group
DOI: 10.3788/COL202220.120501
关键词
spatial light modulator; Laguerre-Gaussian beam; computer-generated hologram; large topological charge
类别
资金
- National Natural Science Foundation of China [62173342, 61805283]
- Key Research Projects of Foundation Strengthening Program [2019-JCJQ-ZD]
This paper solves the limitations of the spatial light modulator (SLM) screen resolution and the encoding algorithm in generating large topological charge vortex beams through hardware and algorithm improvements. Experimental results demonstrate the successful generation of Laguerre-Gaussian (LG) beams with topological charges up to 1200 and 1400, setting a new benchmark for precise measurement, sensing, and communication applications.
The resolution of the spatial light modulator (SLM) screen and the encoding algorithm of the computer-generated hologram are the primary limiting factors in the generation of large topological charge vortex beams. This paper attempts to solve these problems by improving both the hardware and the algorithm. Theoretically, to overcome the limitations of beam waist radius, the amplitude profile function of large topological charge Laguerre-Gaussian (LG) beam is properly improved. Then, an experimental system employing a 4K phase-only SLM is set up, and the LG beams with topological charge up to 1200 are successfully generated. Furthermore, we discuss the effect of different beam waist radii on the generation of LG beams. Additionally, the function of the LG beam is further improved to generate an LG beam with a topological charge as high as 1400. Our results set a new benchmark for generating large topological charge vortex beams, which can be widely used in precise measurement, sensing, and communication.
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