If I have two different light modes focused onto a single spot, could they interfere?
Theoretically I think the answer is no, practically, they could. I'm just studying how different wavelengths of light are combined and sent down a single fibre optic cable, then split using gratings at the other end into separate wavelengths again. This is allowed but there is some distortion associated with the method. I don't know the details of the mechanisms though.
What do you mean by "different light modes?"
I am thinking of mode as in the mode in fiber...specifically toying around the idea of a two mode fiber
I assumed you meant "frequency". Your explanation of "different light modes" makes me even more confused as to what you mean!
I believe he's just referring to multimode fibre. And yes the different modes can interfere.
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