Rainbow optical vortices

摘要

A simple method for creation of 'rainbow' polychromatic optical vortices using a point-like white-light source and the computer-generated hologram technique is reported. The conditions of spatial stability of long-distance propagating rainbow optical vortices are established, as well as the regularities governing the radial alternation of colors. The diffraction technique for revealing and diagnostics of vortices at partially coherent beams [Opt. Lett. 28, 878, 2003] is for the first time applied to polychromatic beams supporting phase singularities.