Energy conservation and michelson interferometers

Danyon
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What happens to the energy of a laser beam when it completely deconstructively interferes with itself in a michelson interferometer?
 
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The missing energy goes back to the source. It can be understood from the phase shift attained upon reflection in the beam splitter.
 
Within an interferometer, photon interference causes changes in detect-ability. Collisions between photons do not change energy, except when high-energy photons create matter.
https://en.wikipedia.org/wiki/Two-photon_physics
 

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