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Sidelobe contrast reduction for optical vortex beams using a helical axicon

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Abstract

We present a new approach for generating an optical vortex pattern with reduced sidelobes without increasing the radius of the vortex and without excessive energy loss. Our technique combines the spiral phase plate with a weak axicon to form a helical axicon. Experimental results using a liquid crystal display agree with theory.

© 2007 Optical Society of America

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