A simple optical system for the self-homodyne detection of the orbital angular momentum (OAM) carried by optical beams is introduced. We propose two different schemes based on the use of optical hybrids, which could detect the OAM mode number, even when the input beam might be slightly distorted. A balanced receiver is used to perform a self-homodyne measure of the optical signal from two different locations at the beam wavefront.
© 2012 Optical Society of America
Lasers and Laser Optics
Original Manuscript: April 27, 2012
Revised Manuscript: June 11, 2012
Manuscript Accepted: June 13, 2012
Published: July 12, 2012
Aniceto Belmonte and Juan P. Torres, "Self-homodyne detection of the light orbital angular momentum," Opt. Lett. 37, 2940-2942 (2012)