We all know that light from a single coherent source can create interference patterns and such. What about arbitrary uncorrelated sources?
There will be interference but you won’t see any visible patterns unless the two sources are phase locked to each-other since even the tiny differences in wavelength between supposedly identical lasers (HeNe, for example) translate into beat frequencies of MHz or GHz! (From: Charles Bloom (cbloom@caltech.edu).) The short answer is yes. Let’s just do the math.
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