Composite vortex beams by coaxial superposition of Laguerre–Gaussian beams |
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| Institution: | 1. Henan University of Science and Technology, School of Physics and Engineering, No. 263, Kaiyuan Road, Luoyang 471023, China;2. Chinese Academy of Sciences, State Key Laboratory of Transient Optics and Photonics, Xi’an 710119, China;3. Henan University of Science and Technology, School of Chemical Engineering and Pharmaceutics, No. 263, Kaiyuan Road, Luoyang 471023, China;4. Nanyang Technological University, School of Physical and Mathematical Sciences, Singapore City 637371, Singapore;1. Department of Quantum Electronics, Faculty of Physics, Sofia University “St. Kliment Ohridski,” 5, J. Bourchier Blvd., Sofia 1164, Bulgaria;2. Faculty of Natural Sciences and Mathematics, Institute of Physics, University “Ss. Cyril and Methodius,” Skopje 1000, Republic of Macedonia |
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| Abstract: | We propose the generation of novel composite vortex beams by coaxial superposition of Laguerre–Gaussian (LG) beams with common waist position and waist parameter. Computer-generated holography by conjugate-symmetric extension is applied to produce the holograms of several composite vortex beams. Utilizing the holograms, fantastic light modes including optical ring lattice, double dark-ring and double bright-ring composite vortex beams etc. are numerically reconstructed. The generated composite vortex beams show diffraction broadening with some of them showing dynamic rotation around beam centers while propagating. Optical experiments based on a computer-controlled spatial light modulator (SLM) verify the numerical results. These novel composite vortex beams possess more complicated distribution and more controllable parameters for their potential application in comparison to conventional optical ring lattice. |
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| Keywords: | Singular optics Optical vortices Spatial light modulator Computer holography |
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