Measurement of thermal noise in multilayer coatings with optimized layer thickness
Measurement of thermal noise in multilayer coatings with optimized layer thickness
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具有优化层厚度的多层涂层的热噪声测量
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Ilaria Taurasi
中科院分区：
文献类型：
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作者：
A. Villar;E. Black;R. DeSalvo;K. Libbrecht;C. Michel;N. Morgado;L. Pinard;I. Pinto;V. Pierro;V. Galdi;M. Principe;Ilaria Taurasi
标准的四分之一波长多层光学涂层对于给定数量的涂层将产生最高的反射率，但通常对于规定的反射率它不会产生最低的热噪声。涂层的层厚度优化，以最大限度地减少热噪声可能是有用的，在未来一代的干涉引力波探测器，涂层热噪声预计将限制仪器的灵敏度。我们提出了一个标准的四分之一波长涂层和低噪声优化涂层的热噪声的直接测量结果。测量结果表明，热噪声的减少与建模预测一致。
A standard quarter-wavelength multilayer optical coating will produce the highest reflectivity for a given number of coating layers, but in general it will not yield the lowest thermal noise for a prescribed reflectivity. Coatings with the layer thicknesses optimized to minimize thermal noise could be useful in future generation interferometric gravitational wave detectors where coating thermal noise is expected to limit the sensitivity of the instrument. We present the results of direct measurements of the thermal noise of a standard quarter-wavelength coating and a low noise optimized coating. The measurements indicate a reduction in thermal noise in line with modeling predictions.