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Wavefront registration of an optical vortex generated with the help of spiral phase plates

The phase front measurements of a vortex laser beam have been carried out with the help of a Shack-Hartmann sensor. The vortex beam is generated in the form of a Laguerre-Gaussian beam (LG01 mode) with the help of the special spiral phase plates manufactured by the kinoform technology. The measured shifts of focal spots on the hartmanogram are compared with the calculated shifts.