Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2006-01-08
Physical Review D 74, 022002 (2006)
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
8 pages, 6 figures, 3 tables : accepted version (by Physical Review D)
Scientific paper
10.1103/PhysRevD.74.022002
We have measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam sputtered SiO$_2$ and Ta$_2$O$_5$) in cooled mirrors. The loss was nearly independent of the temperature (4 K $\sim$ 300 K), frequency, optical loss, and stress caused by the coating, and the details of the manufacturing processes. The loss angle was $(4 \sim 6) \times 10^{-4}$. The temperature independence of this loss implies that the amplitude of the coating thermal noise, which is a severe limit in any precise measurement, is proportional to the square root of the temperature. Sapphire mirrors at 20 K satisfy the requirement concerning the thermal noise of even future interferometric gravitational wave detector projects on the ground, for example, LCGT.
Haruyama Tomiyoshi
Ishitsuka Hideki
Ito Kazuhiko
Kuroda Kazuaki
Miyoki Shinji
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