A TiO2:GeO2/SiO2 multilayer mirror coating measured directly in a thermal noise experiment shows a 25% lower coating thermal noise than Advanced LIGO end test mass coatings at 100 Hz, with sub-ppm absorption after annealing.
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Low thermal noise mirror coatings utilising titanium dioxide and germanium dioxide mixtures
A TiO2:GeO2/SiO2 multilayer mirror coating measured directly in a thermal noise experiment shows a 25% lower coating thermal noise than Advanced LIGO end test mass coatings at 100 Hz, with sub-ppm absorption after annealing.