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. 2016 Apr 7;6:24286. doi: 10.1038/srep24286

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Images from left to right correspond to interfere with focal spherical light, focal plane and interfere with divergent spherical light, respectively. The number of the lobes of the helices and their rotation direction reveal that the transmitted beams possess OAM of −3 and 5, respectively. The measured patterns show excellent agreement with the calculated ones.