Generation of vortex beamlet lattices via diffraction of Bessel vortex beams on 2D hole arrays: analytical and numerical calculations and comparison with experimentsO. E. Kameshkov, B. A. Knyazev and I.A. KotelnikovEPJ Web Conf., 195 (2018) 08002DOI: https://doi.org/10.1051/epjconf/201819508002