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Forum: Geometry
Re: Question WLS fiber surface (Yusuf Erdogan)
Date: 27 Jun, 2011
From: Gumplinger Peter <Gumplinger Peter>

Hi Yusuf,

Sorry for the late reply. I don't monitor the geometry forum and when this posting was brought to my attention I was away from computers.

> I&#65533;m just trying to design a WLS-fiber (double-cladded) and have a
> question about the surface. There should be two ways to consider the two
> cladding-layers coating the fibercore.
> 
> 1. I place the fibercore in the volume of cladding-layer1 and then both
> of them in the volume of cladding-layer2 to prevent any overlap or
> unwanted thin gaps between the volumes. But since there is apparently a
> problem with these placements if the solid is a torus (the fiber is
> curved), i dont consider this case. (Also this way i cant define a
> border surface between the fibercore and cladding-layers?!)

Why do you say this? There is nothing wrong with defining BourderSurfaces between mother and daughter volumes. However, you do NOT even have to define a surface at all between your core, clad1 and clad2. All you need to do is give each an index of refraction. The G4 simulation will work perfectly fine. You only have to specify a surface if you do not wish to simulate perfectly smooth surfaces.

> 2. I careful place both fibercore and cladding-layers in the world:
> First the fibercore, then the cladding-layer1 coating the core, at last
> cladding-layer2 coating both fibercore and cladding-layer1. In this case
> i have to define several optical surfaces for all transitions
> (core-clad1, clad1-clad2, clad2-world)...

If you want surfaces you would have to define three also in your senario 1. It is better to use the Russian Matryoshka doll like volume assemblies (your senario 1) although annuli within annuli should work too.

> Further i have learned, that there is also a opportunity to use
> G4LogicalSkinSurface to implement thin cladding-layers to the surface of
> fibercore. But i have no idea how to do this (i know the examples from
> the talks of Peter Gumplinger)

The skin surface is only of interest if you want the same property for all surfaces of a volume. Yes, you could define volumes clad1 and clad2, if you made them as annuli, and the core cylinder, to each have a G4LogicalSkinSurface but that would be a stange way of defining them.

As I said, I suspect you don't need surfaces at all.

BTW, a WLS fiber example with two claddings exists!

examples/extended/optical/wls

Peter

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