Hi everyone,

i need to know if there is a possibility to measure or calculate the fixed angle of a linear polariser. With Malus law i get

I_after = I_before • cos(Θ)^2, where I is the light intensity and Θ is the angle of the linear Polariser.

But I don't know if it is realistic and possible to measure the value of the light intensity (e.g. from an LED, which I would want to use), and if this intensity value will be stable or not, when measuring it before and after the polariser.

Is there an idea how to measure or calculate this angle precisely?

the components i have: 1x LED, 1x Polarizer, BSO Crystal, Fiber,

1x Beamsplitter and 2x Photo-diode

Thanks in advance and i hope someone has an idea.