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Idea Re: can geant4 cosider optical processes and atomic relaxation simultaneously? 

Forum: Processes Involving Optical Photons
Re: None can geant4 cosider optical processes and atomic relaxation simultaneously? (Mahdi)
Re: Idea Re: can geant4 cosider optical processes and atomic relaxation simultaneously? (Gumplinger Peter)
Re: None Re: can geant4 cosider optical processes and atomic relaxation simultaneously? (Mahdi)
Date: 12 Nov, 2013
From: Gumplinger Peter <Gumplinger Peter>

> I can define a light source with a energy spectrum like
> I had in the cylinder and an optional intensity.

OK, that works too. You do your simulation in two parts. Once you have your spectrum and intensity, you simulate just the optics, from previously defined source.

> what that I am concern about it is the BS.As it can see in the image,
> can I simulate those two beam splitters(BS).

Most optical systems can be simulated in G4 so long as the physics can be described by point particles. Interference, for example, cannot.

I'd define the beam splitter as a dielectric_metal surface. In that case, you need to make some modifications to G4OpBoundaryProcess itself. Please, see:

http://www-geant4.kek.jp/lxr/source/processes/optical/src/G4OpBoundaryProcess.cc#L442
http://www-geant4.kek.jp/lxr/source/processes/optical/src/G4OpBoundaryProcess.cc#L670

Your surface tranmission becomes (1-reflectivity).

Without changing the G4 source, you can define the BS as a dielectric_dielectric surface with a defined "TRANSMITTANCE". This transmittance overwrites the one that is calculated from Snell's Law. You set Rindex2 == Rindex1 but the material still got to be different because of this logic:

http://www-geant4.kek.jp/lxr/source/processes/optical/src/G4OpBoundaryProcess.cc#L416

In version G4.10.beta, you can define the BS in a third way, as a dielectric_dichroic mirror surface, where the reflectivity can be wavelength dependent also.

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1 None: Re: can geant4 cosider optical processes and atomic relaxation simultaneously?   (Mahdi - 13 Nov, 2013)
(_ Feedback: Re: can geant4 cosider optical processes and atomic relaxation simultaneously?   (Gumplinger Peter - 13 Nov, 2013)
(_ Sad: Re: can geant4 cosider optical processes and atomic relaxation simultaneously?   (Mahdi - 13 Nov, 2013)
(_ Feedback: Re: can geant4 cosider optical processes and atomic relaxation simultaneously?   (Gumplinger Peter - 14 Nov, 2013)
(_ Ok: Re: can geant4 cosider optical processes and atomic relaxation simultaneously?   (Mahdi - 15 Nov, 2013)
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