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We present a family of diffractive binary screens that encode a new type of optical axicons, which generate a dark spot along the optical axis. We report experimental verifications showing the usefulness of these devices in optical alignment.
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Jose A. Soto-Sanchez, Jorge Ojeda-Castaneda, "Axicons with a dark spot on axis," Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); https://doi.org/10.1117/12.355004