Chinese Journal of Quantum Electronics ›› 2022, Vol. 39 ›› Issue (2): 225-250.doi: 10.3969/j.issn.1007-5461.2022.02.004

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Coherence modulation and topological charge measurement of vortex field

WANG Zhuoyi1, ZENG Jun2,3, ZHANG Hao1, LU Xingyuan1, ZHAO Chengliang1∗, CAI Yangjian1,2,3∗   

  1. ( 1 School of Physical Science and Technology, Soochow University, Suzhou 215006, China; 2 School of Physics and Electronics, Shandong Normal University, Jinan 250358, China; 3 Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Devices, Jinan 250358, China )
  • Received:2021-10-06 Revised:2021-11-12 Published:2022-03-28 Online:2022-03-28

Abstract: Vortex field is a kind of special structured light field with spiral wavefront, which is widely used in optical micromanipulation, large-capacity optical communication and super-resolution imaging due to its physical properties such as phase singularity, orbital angular momentum and central dark core structure. By modulating the traditional physical dimensions of vortex field (amplitude, polarization andfrequency), the novel vortex fields with richer modes and wider application can be obtained. In addition, there is a very important regulation dimension of vortex field, that is coherence. Recently, researchers have obtained a novel type of vortex field, namely partially coherent vortex beam, by adjusting the coherence of vortex beam. Compared with fully coherent vortex beam, partially coherent vortex beam has more advantages in some fields, such as higher disturbance resistance to turbulent atmosphere, richer beam shaping, higher self-reconstruction ability and stronger particles trapping ability. In this paper, the research progress of the partially coherent integer vortex beams and the partially coherent fractional vortex beams in recent years is reviewed, and the theoretical model, generation method, transmission characteristics, topological charge measurement and application of partially coherent vortex beam are described in detail.

Key words: physical optics, singularity optics, vortex field, coherence modulation, partially coherent; topological charge measurement

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