Fluctuation Dissipation at work: Thermal noise in reflective optical coatings for GW detectors

Fluctuation Dissipation at work: Thermal noise in reflective optical coatings for GW detectors
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工作中的波动耗散:GW 探测器反射光学涂层中的热噪声

DOI:
10.1109/metroaerospace.2014.6865937
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发表时间:
2014
期刊:
2014 IEEE Metrology for Aerospace (MetroAeroSpace)
影响因子:
--
通讯作者:
R. Nawrodt
R. Nawrodt
中科院分区:
--
文献类型:
--
作者:
D. Heinert;G. Hofmann;R. Nawrodt

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在这篇文章中,我们总结了作为计量应用的引力波探测器的热噪声的基本原理。从经典的布朗运动开始,通过Callen和Welton的涨落耗散定理(FDT),我们重复了噪声计算的演变过程,并得出了FDT的直接公式。用这种直接的方法,我们用有限元分析了各向异性衬底对布朗涂层噪声的影响。先前的研究发现,布朗涂层噪声将主导当前和未来探测器的热噪声频谱。我们总结和讨论了现有的减少这种噪声的不同想法,从而提高了未来探测器的灵敏度。
In this paper we summarize the fundamentals of thermal noise in gravitational wave detectors as a metrological application. We repeat the evolution of noise calculation beginning at the classical process of Brownian motion via the Fluctuation-Dissipation theorem (FDT) of Callen and Welton and arriving at the direct formulation of the FDT. Using this direct approach we present the effect of anisotropic substrates on the Brownian coating noise using a finite element analysis. Previous investigations identified Brownian coating noise to dominate the thermal noise spectrum of current and future detectors. We summarize and discuss different existing ideas to reduce this kind of noise allowing for an increased sensitivity of future detectors.
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