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Forum: Processes Involving Optical Photons
Re: Question Optical photon particle gun (Steve Asztalos)
Date: 13 Jun, 2012
From: Gumplinger Peter <Gumplinger Peter>

Hi Steve,

> Can I generate optical photons isotropically as I have with other
> particle guns?

Yes, you can define an optical photon to be the particle of the G4ParticleGun, or the GeneralParticleGun.

> Must I explicitly randomize the polarization vector as well? Are there any

> nuances to watch out for?

Again, yes you must give every optical photon a polarization. This is exhibited in the novice example N06. To randomize you can recycle the code in SetOptPhotonPolar():

http://www-geant4.kek.jp/lxr/source/examples/novice/N06/README#L47

http://www-geant4.kek.jp/lxr/source/examples/novice/N06/src/ExN06PrimaryGeneratorMessenger.cc

http://www-geant4.kek.jp/lxr/source/examples/novice/N06/src/ExN06PrimaryGeneratorAction.cc#L82

http://www-geant4.kek.jp/lxr/source/examples/novice/N06/optPhoton.mac

Peter

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