LIGO Document G0900670-v2

Stray Light Control in Advanced LIGO

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Coherent light scattered into the interferometer optical mode will cause an apparent differential arm signal. The scattered light displacement noise is proportional to the amplitude of the longitudinal displacement of the scattering source and to the electric field amplitude of the scattered light. For Advanced LIGO, the total scattered light phase noise, expressed in equivalent displacement noise, must be 1/10th the quadrature sum of the suspension thermal noise and the test mass thermal noise.
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added additional text for clarification

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