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Forum: Processes Involving Optical Photons
Re: Question Question about Polarization (Athreya Shankar)
Re: Feedback Re: Question about Polarization (Gumplinger Peter)
Re: Question Re: Question about Polarization (Christoph Aberle)
Date: 03 Apr, 2013
From: Gumplinger Peter <Gumplinger Peter>

Hi Christoph,

> what happens if the polarization is not specified at all when using the
> particle gun to insert optical photons as primaries? Will a random
> polarization be chosen which is perpendicular to the travel direction of
> the photon?

Yes, see:

http://www-geant4.kek.jp/lxr/source//event/src/G4PrimaryTransformer.cc#L150

> Or will it just be undefined? If it's undefined which
> processes are affected by that?

If it were left undefined, the program would probably crash some place. At the very least, Snells Law would come out all wrong.

Peter

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