Understanding Poincare-sphere?

  • #1
Understanding Poincare-sphere!?

Dear physicists,

I have a huge problem understanding the working principle of Poincare-sphere. I know that the Poincare-sphere descibes a four-component Stokes vector and I know where I can find all forms of polarization (linear, circular, elliptical, ...).

The problem I have is to show via the Poincare sphere what happens when we have +45° linear polarized light onto a quater waveplate (Quater waveplate: we have fast axis vertical and slow axis horzonal oriented). The output must be something left or right handed polarized. But I don't know how to read the result out of the sphere! I read several books and descriptions but I couldn't find a proper answer.

Another point, does anybody knows how one can find the principal states of polarization on the Poincare-sphere?

Many thanks

Cheers
Tobias
 

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