Rapid Generation of Light Beams Carrying Orbital Angular Momentum

Abstract

We report a technique for encoding both amplitude and phase variations onto a laser beam using a single digital micro-mirror device (DMD). Using this technique, we generate Laguerre-Gaussian and vortex orbital-angular-momentum (OAM) modes, along with modes in a set that is mutually unbiased with respect to the OAM basis. Additionally, we have demonstrated rapid switching among the generated modes at a speed of 4 kHz, which is much faster than the speed regularly achieved by spatial light modulators (SLMs). The dynamic control of both phase and amplitude of a laser beam is an enabling technology for classical communication and quantum key distribution (QKD) systems that employ spatial mode encoding.

References in corpus (4)

• Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
• Influence of Atmospheric Turbulence on Optical Communications using Orbital Angular Momentum for Encoding
• Near-Perfect Sorting of Orbital Angular Momentum and Angular Position States of Light
• Shaping Laguerre-Gaussian laser modes with binary gratings using a Digital Micromirror Device

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