Characteristics of beam splitters

[naima]

I read that there are polarizing and non polarizing beam splitters.
Are there adjustable bleam splitters between them?

 

[Simon Bridge]

How do you mean "adjustable"?

Polarizing and non-polarizing beam splitters do not exist as ends of a spectrum - they are different machines.
Have you checked out how they work?
http://en.wikipedia.org/wiki/Beam_splitter

 

[UltrafastPED]

You can always rotate the polarization plane with a half wave plate.

This allows you to use a polarizing beam splitter which has a fixed ratio, and modify the inputs ... voila, a variable beam splitter!

I used this all the time as a mechanism to control power distribution on two legs of an optical delay line.

The lesson is: use multiple components when you need to do something that no single component will do for you.

 

[naima]

It appears that birefringence can be an adjustable parameter.