Combining light beams question

[jimgraber]

When you combine two light beams with a half-silvered mirror, do you get a mixture or a superposition?

 

[Bill_K]

It depends on how the two light beams were generated. If they're coming from two separate sources, it's a mixture. To get a superposition, the incoming beams have to be coherent to begin with.

 

[jimgraber]

Thanks, Bill.
Is there any other way to get a superposition of independent beams?
TIA. Jim Graber