Is there any relation between refractive index and polarization?
I am suggesting that there will not necessarily be an angle at which the horizontal vector is ever zero for a birefringent substance. This would be because there are two Brewster angles involved potentially (depending on the actual direction of arrival of the incident ray..It may be, sure.
The Brewster angle will have a range of values, depending of the orientation of the normal to the optic axis of the crystal.
Maybe this is what you mean by "Brewster angles are different"? But for each orientation the reflection coefficient for one polarization become zero at the Brewster angle for that orientation. I think that this does not change.
Would it be possible for you to translate that article into a few words - just relating to the question? I tried to stagger through it but failed to pick up the important arm waving bit that I needed i.e. to say whether or not the brewster angle would be different for different arrival azimuths? I think that is implied but can't be sure.The Fresnel equations for isotropic-anisotropic, anisotropic-isotropic, etc. interfaces are given here:
It looks like you have to pay to see that.(?)
You are welcome.Thanks for the other link, nasu. It's kind of bizarre: there's no discussion either in Born and Wolf or the Handbook of Optics (although there's a claim in vol. 4, 2.19 that the equations are present 'elsewhere in this Handbook'), even though there are detailed models of birefringent devices that use reflection: Nicol prisms, etc.