LIGO Document E1500093-x0

ITM09 Coating, Haze on AR surface, waiver

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E - Engineering documents
ITM09 Coating, Haze on AR surface
The haze seen on the AR surface does not fall under our specification as the defects are all approximately 1 micrometer, thus below the 4 micrometer size that we characterize. The scatter was measured directly at Fullerton T1400252. In summary: "probably only ten to tens of ppm when all of the solid angle is taken into account. This was measured on the surface with an AR coating reflectivity of several hundred ppm. Now that the AR is more efficient (by a factor of ~10), the scattering level will go down as well. Also, compare to the AR coating specification of 50ppm.
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