# LIGO Phase Shifts

If the laser light used in Advanced LIGO is $$1064 \text{ nm}$$, an arm of the detector is $$4 \text{ km}$$ long, and the GW150914 system causes strains $$h = 10^{-21}$$, 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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