Abstract
In this work, we demonstrate experimentally the formation of eight different basic structures consisting of bright beams with flat phase fronts in the focus of a lens (i.e. in the artificial far-field). In all cases considered, the used input structure is a large, stable, hexagon-shaped optical vortex (OV) array composed of vortices with alternating topological charges (TCs). The TCs of one individual OV or of the complete OV lattice were erased/doubled in the cases of perfect superposition (on-site alignment) or are manipulated in phase in the cases of different offsets between the lattice elementary cells (off-site alignments). A dramatic reshaping of the input beam is observed in the far-field and it is shown to be in excellent agreement with the numerical simulations.
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