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Energy conservation in the combination of two coherent beams
I was asked a question today by a student that I couldn't find a satisfactory answer to.
Imagine we have two identical laser beams with average electric field strength $E$. Upon combining these beams ...
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What happens to the $E$ and $B$ fields at the edge of a laser beam?
In an ideal plane wave, $E$ and $B$ fields run off to infinity in both directions along straight paths. I've always assumed the center of a laser beam looks like an ideal plane wave, with $E$ and $B$ ...
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