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. 2016 Dec 5;6:6. doi: 10.1038/s41598-016-0015-2

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© The Author(s) 2016

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Diffraction pattern formed in the far-field region when passing the laser beam through the amplitude diffractive optical element, generating a superposition of eight vortex beams. (a) Simulation and (b) experimental result. (c) Experimentally obtained interference patterns of the generated vortex beams.