Management of the orbital angular momentum of vortex beams in a quadratic nonlinear interaction

Light intensity control of the orbital angular momentum of the fundamental beam in a quadratic nonlinear process is theoretically and numerically presented. In particular we analyzed a seeded second harmonic generation process in presence of orbital angular momentum of the interacting beams due both to on axis and off axis optical vortices. Examples are proposed and discussed.

Research highlights
► Method of controlling orbital angular momentum via light intensity.
► Seeded second harmonic generation process involving beams with OAM.
► Second harmonic's intensity level controls the distance over which OAM changes.
► Analytical and numerical analysis of the nonlinear process involving OAM beams.
► Integer and fractional values of OAM were analyzed.