Orbital angular momentum density and spiral spectra of Lorentz–Gauss vortex beams passing through a single slit
Ji Zhi-Yue, Zhou Guo-Quan †
       

The influence of the topological charge on the spiral spectra of the diffracted Lorentz–Gauss vortex beam with w0 = w0x = w0y = 1 mm: (a) M = 0, (b) M = 1, (c) M = −1.