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An upper limit to the orbital angular momentum of a vortex-carrying ultrashort pulse (1812.11147v1)
Published 28 Dec 2018 in physics.optics
Abstract: The magnitude of the topological charge of the vortex of a ring-shaped pulse is found to be limited by the squared mean frequency of the pulse spectrum at the ring relative to its variance. This limitation implies a upper bound to the orbital angular momentum carried by a pulse, and a lower bound to the duration for a pulse to carry any orbital angular momentum.
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