Multiple orbital angular momentum states are axially superposed in a single hologram.
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Simultaneous detection of multiple orbital angular momentum states.
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The first order transmits encoded information in free space optical communications.
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A reading mask ensures the spatial separation of the OAM states.
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A spatial light modulator in the transmitter unit, an amplitude mask in the receiver unit.
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Proof-of-concept to increase capacity of free-space optical communication channels.
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