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Surface profilometry with binary axicon-vortex and lens-vortex optical elements
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DOI：10.1364/OL.39.000119.png)
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Abstract
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We report on the interesting effect observed with the diffractive binary element, which matches the property of an axicon and vortex lens. Binary phase coding simplifies the manufacturing process and gives additional advantages for metrology purposes. Under laser beam illumination, our element produces two waves: converging and diverging. Both waves carry a single optical vortex. We show that this special diffractive element can be used to set up a simple surface profilometer. (C) 2013 Optical Society of America
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