The Optical Vortex Interferometer (OVI ) uses a regular lattice of optical vortex points. Such lattice can be generated by
amplitude division obtained in the modified Mach-Zender set-up. This was reported in our previous papers ([14] - [19]).
In this work the vortex lattice obtained by wavefront division is reported. We use the opaque screen with three or more
holes. The optical vortex lattice obtained using three holes in the screen reveals some special properties as it is in three
plane waves version of OVI. We analyze the properties of such lattice as well as lattice generated by four waves and
report on possible applications of this particular simple device. The theoretical considerations are illustrated by the
experimental results.
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