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AdventuresinARAbsorption.pdf-DCC-LIGO.PDF
Optical Coatings
Adventures in AR Absorption with aLIGO Core Optics LSC-VIRGO , 2012 Margot Phelps GariLynn Billingsley Liyuan Zhang LIGO-G1200960 1 Outline AR and HR Tantala thin films Compensation Plate Coating loss Anneal Temperature AR coatings- aLIGO Beamsplitter AR coatings- aLIGO Compensation Plate Trial and error! Real mechanisms behind AR absorption LIGO-G1200960 Advanced LIGO 2 HR and AR Coatings on Recycling Cavity Optics aLIGO COC optical coatings- made up of silica (SiO2) and tantala (Ta205) layers of varying width. Coating absorption- Strict absorption requirements for all aLIGO coatings on optics, 1ppm Harder to meet this on AR than on HR » Can achieve 1ppm for HR, AR is much more sensitive. HR coatings-not worried about transmission » Tantala is used deeper in the stack, and in thicker layer AR coatings- power transmission throughout all layers, not just the top as in HR. LIGO-G1200960 Advanced LIGO 3 Why use thin film tantala? Stress Balance Mismatched IBS coating stress beam splitter design Aspect ratio Test masses: ~2:1 Beamsplitters ~6:1
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