Pulsed light beams in vacuum with superluminal and negative group velocities

Details Pulsed light beams in vacuum with superluminal and negative group velocities Pulsed light beams in vacuum with superluminal and negative group velocities

2002-02-27

arxiv.org/abs/physics/0202069v1

Physics

Optics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevE.67.066604

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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