Demonstration of the Multimaterial Coating Concept to Reduce Thermal Noise in Gravitational-Wave Detectors.,Physical Review Letters

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Demonstration of the Multimaterial Coating Concept to Reduce Thermal Noise in Gravitational-Wave Detectors.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-01 , DOI: 10.1103/physrevlett.125.011102
Simon C Tait ₁ , Jessica Steinlechner _{1,

2,

3,

4} , Maya M Kinley-Hanlon ₁ , Peter G Murray ₁ , Jim Hough ₁ , Graeme McGhee ₁ , Felix Pein ₂ , Sheila Rowan ₁ , Roman Schnabel ₂ , Cassady Smith ₁ , Lukas Terkowski ₂ , Iain W Martin ₁

Affiliation

Thermal noise associated with the mechanical loss of current highly reflective mirror coatings is a critical limit to the sensitivity of gravitational-wave detectors. Several alternative coating materials show potential for reducing thermal noise, but cannot be used due to their high optical absorption. Multimaterial coatings have been proposed to enable the use of such materials to reduce thermal noise while minimizing their impact on the total absorption of the mirror coating. Here we present experimental verification of the multimaterial concept, by integrating aSi into a highly reflective

{SiO}_{2}

and

{Ta}_{2} O_{5}

multilayer coating. We show a significant thermal noise improvement and demonstrate consistent optical and mechanical performance. The multimaterial coating survives the heat treatment required to minimize the absorption of the aSi layers, with no adverse effects from the different thermomechanical properties of the three materials.

中文翻译：

演示了减少重力波探测器中的热噪声的多材料涂层概念。

与当前高反射镜涂层的机械损耗相关的热噪声是对重力波探测器灵敏度的关键限制。几种替代涂料显示出降低热噪声的潜力，但由于它们的高光吸收性而无法使用。已经提出了多材料涂层，以使得能够使用这种材料来减少热噪声，同时最小化它们对镜面涂层的总吸收的影响。在这里，我们通过将aSi集成到高反射率中，提出了对多材料概念的实验验证