LIGO Phase Shifts

If the laser light used in Advanced LIGO is 1064 nm1064 \text{ nm}, an arm of the detector is 4 km4 \text{ km} long, and the GW150914 system causes strains h=1021h = 10^{-21}, what is the phase shift in laser light traversing a detector arm at maximum displacement versus no displacement, in radians?


See Gravitational Waves.

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