The superposition of noncoaxial light beams containing screw wave-front dislocations is shown to create light patterns with a richer vortex content than that given by the arithmetic of the topological charges of the individual beams. We report the experimental observation of this phenomenon.
CitationMolina-Terriza, G.; Recolons, J.; Torner, L. The curious arithmetic of optical vortices. Optics letters, 2000, vol. 25, núm. 16, p. 1135-1137.