title: Quadrant detector calibration for vortex beams.
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 ℓ. We compare LG beams with hard-ringed beams and find that at higher ℓ 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.
authors.affiliation: Huygens Laboratory, Leiden University, Leiden, The Netherlands. hermosa@molphys.leidenuniv.nl
authors.forename: N
authors.initials: N
authors.lastname: Hermosa
authors.forename: A
authors.initials: A
authors.lastname: Aiello
authors.forename: J P
authors.initials: JP
authors.lastname: Woerdman