Abstract
It is known that the astigmatic transformation is used to analyze the topological charge of a vortex beam. In this paper, to implement astigmatic transformations of vortex beams, a multichannel filter is used, which is matched to various aberrations described by Zernike polynomials. Such a filter allows several wave aberrations of various types and levels to be introduced into the analyzed vortex beam at once in order to implement various aberrational transformations, including astigmatism. In this case, a set of aberration-transformed distributions of the analyzed vortex beam is formed in the focal plane in different diffraction orders, which facilitates the determination of the vortex topological charge.
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