Abstract
The propagation of an optical vortex beam through a diamond-shaped aperture is studied both numerically and experimentally. It is found that the diffraction pattern of the vortex beam through the diamond-shaped aperture is related with the topological charge m of the incident optical vortex beam. Thus, the magnitude of the vortex can be measured by using this method. A higher-order optical vortex (|m|>1) is topologically unstable and splits into |m| vortices with unit charge in the diffraction field, which deviate from the optical axis with a distance. The distance increases upon propagation. The theoretical predictions are confirmed by our experiments.
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