Abstract

We propose a method for identifying orbital angular momentum (OAM) states within a vortex superposition using a Shack–Hartmann (SH) sensor as a spatial-diversity detector. We define a local OAM at every pixel of the SH image, from which we construct an OAM spectrum. The topological charges are determined from the OAM spectrum using a low-complexity algorithm, resulting in estimates that are robust to beam wandering. Data from a 200 m experimental transmission are successfully tested using the proposed technique.

© 2020 Optical Society of America

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Supplementary Material (4)

NameDescription
» Visualization 1       Experimental laser beam carrying orbital angular momentum states -8 and 12, propagated over 200 m. J. A. Anguita and J. E. Cisternas
» Visualization 2       Experimental laser beam carrying orbital angular momentum states -20 and 20, propagated over 200 m. J. A. Anguita and J. E. Cisternas
» Visualization 3       Experimental laser beam carrying orbital angular momentum states -15 and 30, propagated over 200 m. J. A. Anguita and J. E. Cisternas
» Visualization 4       Experimental laser beam carrying orbital angular momentum states -30 and 30, propagated over 200 m. J. A. Anguita and J. E. Cisternas

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Equations (6)

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