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It seems as if you still have not addressed the problem
of combining the outputs of two laser beams so that
the two beams are always in phase with each other
over a comparitively long distance.
Now that's a problem for someone on this list-serv to solve.
Herb Gottlieb from New York City
(Where it is difficult to combine two waves in space,
from different sources, so the two beams are always
in phase with each other over a significantly long distance.
Perhaps a California physicist can do better???)