Simulation of the super-Gauss beam abrupt focusing in the near diffraction zone using high-performance computer systems

Abstract

We investigated the change in the type of focal spot when laser radiation passed through the diffraction axicon and the optical element matched with the circular Airy distribution having abrupt focusing properties. Modelling of near zone diffraction is numerically investigated by the finite difference time domain (FDTD) method. The abrupt formation of a light needle was shown for the optical element matched with the circular Airy distribution and for axicon.