Optical Vortex Generation via Nonlinear Wave Mixing of Tightly Confined Modes in Optical Nanofiber

Abstract

We propose and experimentally demonstrate optical vortex generation via spin-orbit-interaction-assisted intermodally phase-matched third-harmonic generation in a silica-glass multimode adiabatic optical nanofiber. Our scheme operates with a single Gaussian pump beam and simple pump polarization control.