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(Color online) Diffraction pattern at the focal plane (intensity and phase) of an incident Gaussian beam onto [(a) and (b)] a glass plate with a constant height imparting uniform phase shift of and [(c) and (d)] a conventional wedge imparting linear phase ramp.
(a) Simulation of the elliptical-shaped vortex beam generated by a wedge. (b) Vortex beam with value generated after low-pass spatial filtering. (c) Pure helical phase of the vortex beam after spatial filtering at a distance of .
(a) Experimentally generated elliptical-shaped vortex beam by a wedge. [(b) and (c)] Vortex beam in free-space propagation with value after a low-pass spatial filter at distances of 0.5 and , respectively.
(Color online) (a) Plot of value as a function of radius of the aperture stop at two different propagation distances, (b) is the radius of the maximum intensity of vortex beam at the focal plane.
[(a) and (b)] Phase distribution of the spatial filtered vortex beam at the focal plane when employing aperture radii of and , respectively.
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