Controlled acceleration of superimposed Bessel beams

Abstract

In this work we present a mechanism for generating superpositions of non-canonical, higherorder Bessel beams, which are characterized by the anisotropy of the optical vortex on the propagation axis, known as the morphology parameter. We implement a spatial light modulator (SLM) to create superimposed, non-canonical, higher-order Bessel beams and a CCD camera to investigate the propagation of the resulting field. It is already known that the intensity profile of the resulting field experiences an angular rotation. However, we show that by tuning the morphology parameter, the rate of rotation will change periodically as a function of the propagation distance. Apart from demonstrating the controlled angular acceleration of the resulting intensity profile, we also show the transfer of energy between accelerating and decelerating sections in the intensity profile.