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Question propagation speed of optical photons 

Forum: Processes Involving Optical Photons
Date: 03 Apr, 2015
From: Hans Wenzel <Hans Wenzel>

hi

I was looking at the propagation speed of optical photons in a lead fluoride crystal (see attached gdml file) I see slower propagation of light than I would expect from the refraction index that I put in.

for

Photon energy 2 eV, time for 100 mm = 0.619201 nsec corresponds to n=1.856 when the input is 1.762 Photon energy 4 eV, time for 100 mm = 0.789297 nsec corresponds to n=2.399 when the input is 1.92658

any ideas?

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/04/03/09.41-9681-opticalphothon-4eV.mac
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/04/03/09.41-71382-opticalphothon.mac
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/04/03/09.41-21420-ecrystal_color__PbF2.gdml

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1 Ok: Re: propagation speed of optical photons   (Hans Wenzel - 07 Apr, 2015)
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