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Ok Re: propagation speed of optical photons 

Forum: Processes Involving Optical Photons
Re: Question propagation speed of optical photons (Hans Wenzel)
Date: 07 Apr, 2015
From: Hans Wenzel <Hans Wenzel>

Ok. To answer my own question. Geant 4 propagates the optical photons with the group velocity not the phase velocity (c/n), where the group velocity is

vg = c/(n(E)+dn/d(log(E))

The plot compares phase velocity, group velocity and the velocity with which optical photons are propagated in PbF4.

Looks like geant 4 does a good job.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/04/07/07.37-19890-velocity.png

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