Message: Re: Incorrect velocity of optical photons in a scintillating medium Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

Disagree Re: Incorrect velocity of optical photons in a scintillating medium 

Forum: Processes Involving Optical Photons
Re: Question Incorrect velocity of optical photons in a scintillating medium (Christoph Aberle)
Date: 20 Mar, 2013
From: Gumplinger Peter <Gumplinger Peter>

Hi Christoph,

Optical photons are treated as particles in Geant4. As such they propagate not with phase velocity, c/n, but with the 'group velocity':

v_group = c/(rindex+d(rindex)/d(log(E_phot)))

For normal dispersive media - dn/d(logE) > 0, see:

http://www-geant4.kek.jp/lxr/source/materials/src/G4MaterialPropertiesTable.cc#L172

Peter

 Add Message Add Message
to: "Re: Incorrect velocity of optical photons in a scintillating medium"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews