We report a reduction in motion for suspended seismic-isolation platforms in a gravitational wave detector prototype facility. We sense the distance between two seismic-isolation platforms with a suspension platform interferometer and the angular motion with two optical levers. Feedback control loops reduce the length changes between two platforms separated by \(11.65\,\textrm{m}\) to \(10\,\mathrm {pm\,Hz}^{-1/2}\) at \(100\,\textrm{mHz}\), and the angular motion of each platform is reduced to \(1\,\mathrm {nrad\, Hz}^{-1/2}\) at \(100\,\textrm{mHz}\). As a result, the length fluctuations in a suspended optical resonator on top of the platforms is reduced by three orders of magnitude. This result is of direct relevance to gravitational wave detectors that use similar suspended optics and seismic isolation platforms.

我们报告了引力波探测器原型设施中悬浮式隔震平台的运动减少。我们用悬挂平台干涉仪感测两个隔震平台之间的距离，并用两个光学杠杆感测角运动。在\ ( _ _ _ 100\,\textrm{mHz}\) ，每个平台的角运动在\ (10\,\ textrm{mHz}\). 结果，平台顶部悬挂光学谐振器的长度波动减少了三个数量级。这一结果与使用类似悬浮光学和地震隔离平台的引力波探测器直接相关。