Thermal noise in interferometric gravitational wave detectors due to dielectric optical coatings
By Gregory M. Harry, A. Gretarsson, P. Saulson, Scott E. Kittelberger, S. Penn, W. Startin, S. Rowan, M. Fejer, D. Crooks, G. Cagnoli and 2 more. 2001
337 citations recorded by the source corpus.
We report on thermal noise from the internal friction of dielectric coatings made from alternating layers of Ta2O5 and SiO2 deposited on fused silica substrates. We present calculations of the thermal noise in gravitational wave interferometers due to optical coatings, when the material properties of the coating are different from those of the substrate and the mechanical loss angle in the coating is anisotropic. The loss angle in the coatings for strains parallel to the substrate surface was determined from ringdown experiments. We measured the mechanical quality factor of three fused silica samples with coatings deposited on them. The loss angle, ϕ||(f), of the coating material for strains parallel to the coated surface was found to be 4.2 ± 0.3 × 10−4 for coatings deposited on commercially polished slides, and 1.0 ± 0.3 × 10−4 for a coating deposited on a superpolished disc. Using these numbers, we estimate the effect of coatings on thermal noise in the initial LIGO and Advanced LIGO interferometers. We also find that the corresponding prediction for thermal noise in the 40 m LIGO prototype at Caltech is consistent with the noise data. These results are complemented by results for a different type of coating, presented in a companion paper.
Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Ocean Engineering
View Paper: https://www.semanticscholar.org/paper/7bb9ef96eb693cc04d83906e0ec5a801a0372928
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Citations in the corpus
- Gravitational Radiation Detection with Laser Interferometry (2013, background): “…this loss on type of material, number of layers, and layer structure have been studied extensively (Bassiri et al. , 2012; Braginsky and Vyatchanin, 2003; Evans et al. , 2012; Flaminio et al. , 2010; Harry et al. , 2007, 2006, 2002; Hong et al. , 2012; Kondratiev et al. , 2011; Penn et al. , 2003).”
- Titania-doped tantala/silica coatings for gravitational-wave detection (2006, background): “The coating used in initial interferometers, alternating λ/4 layers of SiO2 and Ta2O5, was studied to determine if the mechanical loss was enough to cause thermal noise problems [6, 15].”
- LIGO: The laser interferometer gravitational-wave observatory (2006, neutral): “surface (test mass thermal noise) [45].”