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26 August 2005Two methods to determine topological charge in regular net of optical vortices
A regular net of optical vortices generated by three plane waves interference allows for a new kind of interferometer -
Optical Vortex Interferometer. The precision of that kind of interferometer depends on a localization accuracy and phase
reconstruction. One problem is the unique phase reconstruction. Interference of three waves can generate two identical
interferograms with opposite topological charge of vortices, so information from three waves interferogram is not
enough to the unique phase reconstruction. First method of topological charge determination requires one interferogram
of two waves analyzed in an experiment and knowledge about a direction of laser beams. Second method is based on
analysing interferogram with the fourth wave added.
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Ewa Fraczek, Wojciech Fraczek, "Two methods to determine topological charge in regular net of optical vortices," Proc. SPIE 5858, Nano- and Micro-Metrology, 58580V (26 August 2005); https://doi.org/10.1117/12.612251