Partially coherent perfect vortex beam generated by an axicon phase
Xiaofei Li, Huazhe Wei, Taco D. Visser, Yangjian Cai, Xianlong Liu
Abstract
Vortex beams are structured light fields with a helical phase of the form exp (ilϕ) that carries an optical angular momentum (OAM) of lℏ per photon. Such beams typically have a ring-shaped intensity with a radius that varies with l. Perfect vortex (PV) beams are designed to have a radius that is approximately uniform over a certain OAM range. Here, we report how spatial coherence can be used to maintain a fixed ring shape over a larger propagation distance and for a greater OAM range than is possible for fully coherent vortex beams. Our work is relevant for the application of PV beams in areas such as trapping, tweezing, and optical communications.
Topics & Concepts
AxiconPhysicsOptical vortexOpticsVortexRADIUSAngular momentumCoherence (philosophical gambling strategy)Light beamBeam (structure)Phase (matter)Coherence lengthVortex ringLaser beamsLaserClassical mechanicsQuantum mechanicsComputer securityComputer scienceThermodynamicsSuperconductivityOrbital Angular Momentum in OpticsNear-Field Optical MicroscopyMetamaterials and Metasurfaces Applications