title: Square lattices of quasi-perfect optical vortices generated by two-dimensional encoding continuous-phase gratings.
abstract: We propose a type of two-dimensional (2D) encoding continuous-phase gratings capable of simultaneously generating a square lattice of multiple quasi-perfect vortices. As an example, a symmetrical and an asymmetrical 5×5 lattice of quasi-perfect vortices are experimentally demonstrated. It is shown that multiple quasi-perfect vortices with different topological charges are generated at different diffraction orders. The ring-width of these vortices is nearly constant, while there is a shift in the average ring-diameter when the carried charges are large enough, or when the ring-diameter is small. Additional axicon phase has been embedded into these 2D encoding gratings for the compensation of such shift in the average ring-diameter, and experimental results show that the shift can be greatly minimized after this compensation.
authors.forename: Junjie
authors.initials: J
authors.lastname: Yu
authors.forename: Changhe
authors.initials: C
authors.lastname: Zhou
authors.forename: Yancong
authors.initials: Y
authors.lastname: Lu
authors.forename: Jun
authors.initials: J
authors.lastname: Wu
authors.forename: Linwei
authors.initials: L
authors.lastname: Zhu
authors.forename: Wei
authors.initials: W
authors.lastname: Jia