LIGO Document T1200489-v1
- The surface deformations and thermal lens in an aLIGO BS induced by the thermal heating by the absorptions in the coatings and substrates are analyzed using COMSOL. The coating absorption is the main cause of the thermal effect and the thermal lens, ~10nm length change in the central region, is the main effect and the surface deformation, ~1nm, is smaller by factor 10. Observed asymmetry of the AR coating absorption in the vertical direction seems to cause little effect on the thermal effect.
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