Pulsed light beams in vacuum with superluminal and negative group velocities
arXiv:physics/0202069 · doi:10.1103/PhysRevE.67.066604
Abstract
Gouy's phase of transversally limited pulses can create a strong anomalous dispersion in vacuum leading to highly superluminal and negative group velocities. As a consequence, a focusing pulse can diverge beyond the focus before converging into it. A simple experiment is proposed.
4 pages, 5 figures
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