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LASERS EMIT COHERENT LIGHT, BUT NOT BECAUSE THE ATOMS EMIT
IN-PHASE LIGHT WAVES
Even fairly advanced textbooks fail to give the real reason why laser
light is coherent. It is true that the fluorescing atoms in a laser all
emit light that is in phase with the waves already travelling between the
mirrors. ... After a few
thousand mirror bounces, all the different waves which started out from
different parts of the laser tube have added and subtracted to form a
single wave. ...