Variable-radius focused optical vortex with suppressed sidelobes

Opt Lett. 2006 Jun 1;31(11):1600-2. doi: 10.1364/ol.31.001600.

Abstract

We propose a design for a phase mask for generating an optical vortex with suppressed sidelobes in the focal plane where the radius of the intensity ring is variable. A radial modulation added to conventional phase mask exp(iltheta) projects the light diffracted from different annular zones into a single intensity ring in the focal plane.