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Spatial characteristics of the optical-vortex (OV) beams created during theGaussian beam diffraction by a grating with groove bifurcation are analyzedtheoretically and numerically. In contrast to previous works, condition ofsmall-angle diffraction is no longer required and the diffracted beam can bestrongly deformed. This causes the intensity profile rotation and thehigh-order OV decomposition into a set of secondary single-charged OVs. Theseeffects are studied quantitatively and confronted with similar properties of aLaguerre-Gaussian beam that undergoes astigmatic telescopic transformation. Incontrast to the latter case, the secondary OVs do not lie on a single straightline within the beam cross section, and morphology parameters of the individualsecondary OVs carried by the same beam are, in general, different. Conditionsfor maximum relative separation of the secondary OVs with respect to the beamtransverse size are specified. The results can be used for practical generationof OV beams and OV arrays with prescribed properties.

High-angle diffraction of a Gaussian beam by the grating with embedded phase singularity