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Nevel doubt the energy conservation. In order to combine two beams, you must
use a beamsplitter. Because the reflection is out-of-phase with the
incident beam (half-wave loss), if on one side of the BS the two waves are
in phase, then they must be out-of-phase on the other side. The total energy
is always the sum of the two laser beams, but how does the energy
distribution between both sides depends on the relative phase.



[ Last edited by yitianjian on 2010-12-9 at 00:19 ]
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