Abstract
Combining the circular Dammann grating and vortex phase structures, we present circular Dammann vortex gratings (CDVGs) for the generation of impulse vortex rings in the far field. Theoretical results reveal that each diffraction order is mainly composed of a single topological charged vortex beam. Numerical solution and fabrication method, as well as the experimental results are given. Our results suggest that CDVGs can provide a relatively simple approach to produce impulse optics vortex rings for many potential applications.
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