Phase reconstruction with optical vortex interferometer

The optical vortex interferometer (OVI) is based on the regular net of optical vortices, which is generated by the interference of three plane waves. In this paper the use of OVI to phase determination is discussed. In classical interferometry the phase of the wave is determined in respect to the phase of the reference wave. The quality of reference wave must be checked by some other methods (like parallel glass plate test). It is shown that in case of OVI the phase of the investigated wave can be reconstructed without referring to any other wave.