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Encoding generalized phase functions on Dammann gratings
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DOI：10.1364/OL.35.001536.png)
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We extend the Dammann encoding concept to more general phase functions, i.e., to encode a phase pattern so that a number of diffracted orders have the same intensity. We demonstrate a Dammann vortex grating that generates different vortex patterns in the different diffracted orders. We also show a Fresnel lens that creates seven transverse focal spots in each of seven axial planes. (C) 2010 Optical Society of America
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