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Forum: Processes Involving Optical Photons
Re: Question Optical Photons Not Propagating Down WLS Fibre
Re: Feedback Re: Optical Photons Not Propagating Down WLS Fibre (Gumplinger Peter)
Re: Question Re: Optical Photons Not Propagating Down WLS Fibre
Date: 06 Jan, 2017
From: Gumplinger Peter <Gumplinger Peter>

Hi Emile,

Sorry, I was away on Xmas vacation.

I can only say that Geant4 propagates optical photons correctly between dielectric media. It has been tested and used by many users. There is nothing fundamentally difficult with Snells' law either. So, if the result isn't what you expect then the MC approach was beneficial.

Also, check your code, perhaps the refractive indexes have been asigned to the wrong volume(s).

> Is my logic above correct? If so, are there any other factors that might
> be allowing the photons to escape the fibre as they are?

You can always debug the optical photon tracking, step by step, for a small number of trajectories and find out what happens.

Best regards, Peter

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