Acceleration of femtosecond pulses to superluminal velocities by Gouy phase shift

@article{Horvath1996AccelerationOF,
  title={Acceleration of femtosecond pulses to superluminal velocities by Gouy phase shift},
  author={Zoltan L. Horvath and J{\'o}zsef Vink{\'o} and Zsolt Bor and Dietrich von der Linde},
  journal={Applied Physics B},
  year={1996},
  volume={63},
  pages={481-484}
}
The phase and the group velocities are calculated in a three-dimensional neighbourhood of the focus of an aberration-free lens illuminated by a spatially Gaussian beam. The Gouy phase shift caused by the diffraction results in superluminal pulse propagation on the optical axis within the Rayleigh range. 
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