Pulsed light beams in vacuum with superluminal and negative group velocities
M. A. Porras, I. Gonzalo, A. Mondello
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.
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