Unfortunately (or fortunately :-) POV-Ray is not intended for realistic 
physic simulation, hence you can't vary continously the refraction 
index. And even if you try simulating that with small discontinous 
variations, you wouldn't be able to describe a laser light, because 
POV-Ray doesn't know anything about light coherence and interferences.

I think you should turn toward specialized software like 
http://www.optenso.de/download/download.html (I haven't tried it though).

Good simulations,

JC

Fabian Dortu wrote:
> I never used Povray but intend to do it for some scientific purpose. Before
> diving into the manual, I would like to know if I could solve this problem:
> 
> I would like to define a object by a refraction index distribution n =
> n(x,y,z). Then I would like to illuminate the object by laser light and
> observe the reflected light resulting from the index gradient in the
> material and the interference of the coherent light.
> 
> Thankx,
>   Fabian
>

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