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Optical vortex interference with plane colinear wave

Here we analyze simulation of vortex interference with plane colinear wave and experimental verification of that one. The vortex was created with the application of synthethic hologram. Interferometer used for experimental investigation, contain three branches: vortex field, test colinear wave and off axis reference wave. The position of vortex were found in two stages, first with the help of reference wave, characteristic fork pattern was used to localize vortex area, and finally exact position of vortex were found by paraboloid shape matching to intensity distribution . Finally, dependence of vortex position on amplitude and phase of testing wave is presented.