Material loss angles from direct measurements of broadband thermal noise

Abstract : We estimate the loss angles of the materials currently used in the highly reflective test-mass coatings of interferometric detectors of gravitational waves, namely Silica, Tantala, and Ti-doped Tantala, from direct measurement of coating thermal noise in an optical interferometer testbench, the Caltech TNI. We also present a simple predictive theory for the material properties of amorphous glassy oxide mixtures, which gives results in good agreement with our measurements on Ti-doped Tantala. Alternative measurement methods and results are reviewed, and some critical issues are discussed.
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Maria Principe, Vincenzo Pierro, Riccardo Desalvo, Ilaria Taurasi, Christophe Michel, et al.. Material loss angles from direct measurements of broadband thermal noise. Physical Review D, American Physical Society, 2015, 91, ⟨10.1103/PhysRevD.91.022005⟩. ⟨in2p3-01357328⟩

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