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# Place the output coupler at the desired distance for the long arm. Use the iris from step 2 to make sure it retroreflects the beam precisely.
# Place the flat mirror at the short arm distance from the first curved mirror. Use the iris to align the retroreflection from the back of the mirror.
== Things to Try ==
Remove short arm flat mirror and align blue along hene/780
Mode match 780 and look for interference at the output
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