Abstract

This Letter reports an experimental and theoretical study of the response of a quadrant detector (QD) to an incident vortex beam, specifically a Laguerre–Gaussian (LG) beam. We have found that the LG beam response depends on the vorticity index . We compare LG beams with hard-ringed beams and find that at higher values, the QD response to LG beams can be approximated by its response to hard-ringed beams. Our findings are important in view of the increasing interest in optical vortex beams.

© 2011 Optical Society of America

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