Experimental measurements of mechanical dissipation associated with dielectric coatings formed using SiO2, Ta2O5 and Al2O3
Experimental measurements of mechanical dissipation associated with dielectric coatings formed using SiO2, Ta2O5 and Al2O3
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DOI：
10.1088/0264-9381/23/15/014
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发表时间：
2006-07
影响因子：
3.5
通讯作者：
D. Crooks;G. Cagnoli;M. Fejer;G. Harry;J. H. Hough-;B. Khuri-Yakub;S. Penn;R. Route;S. Rowan;P. Sneddon;I. Wygant;G. Yaralioglu
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文献类型：
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作者：
D. Crooks;G. Cagnoli;M. Fejer;G. Harry;J. H. Hough-;B. Khuri-Yakub;S. Penn;R. Route;S. Rowan;P. Sneddon;I. Wygant;G. Yaralioglu
先前的研究已经量化了离子束溅射SiO2和Ta2O5交替层形成的介电薄膜的机械耗散，并得出结论，这种耗散可能导致所提出的先进引力波探测器中潜在的显著水平的热诱导位移噪声。我们在这里首次报道了分别由Al2O3和Ta2O5、SiO2和Al2O3交替层形成的涂层的机械耗散测量，当应用于熔融二氧化硅基底时。此外，我们报告了我们对Al2O3/Ta2O5和SiO2/Ta2O5涂层弹性性能的测量，因为薄膜弹性性能可以显著影响涂层热噪声的预期水平。总之，我们的分析表明，从热噪声的角度来看，SiO2/Ta2O5涂层目前是未来探测器的最佳选择。
Previous studies have quantified the mechanical dissipation associated with dielectric thin films formed from alternating layers of ion-beam-sputtered SiO2 and Ta2O5 and concluded that such dissipation could lead to potentially significant levels of thermally induced displacement noise in proposed advanced gravitational wave detectors. We report here, for the first time, measurements of the mechanical dissipation of coatings formed from alternating layers of Al2O3 and Ta2O5, and SiO2 and Al2O3, respectively, when applied to fused silica substrates. In addition, we report our measurements of the elastic properties of Al2O3/Ta2O5 and SiO2/Ta2O5 coatings, as the film elastic properties can significantly influence expected levels of coating thermal noise. In summary, our analysis suggests that SiO2/Ta2O5 coatings currently present the best option for future detectors from a thermal noise standpoint.