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.
© 2011 Optical Society of America
Instrumentation, Measurement, and Metrology
Original Manuscript: November 18, 2010
Revised Manuscript: December 15, 2010
Manuscript Accepted: December 16, 2010
Published: January 31, 2011
N. Hermosa, A. Aiello, and J. P. Woerdman, "Quadrant detector calibration for vortex beams," Opt. Lett. 36, 409-411 (2011)