DUAL引力波探测器千克级演示样机：光机激励与冷却
A kg-mass prototype demonstrator for DUAL gravitational wave detector: opto-mechanical excitation and cooling
摘要：
下一代引力波（gw）探测器有望完全进入力和位移探测的量子领域。为此，必须将光机械效应实验从微观范围扩大到大质量系统，并测试应应用于达到量子探测范围的方案。在这项工作中，我们提出了一个大规模的gw探测器的原型，由两个振荡器的质量的数量级的公斤，其距离是由一个高精细光学腔读取的实验特性。通过调制辐射压力激励振子来测量机械响应函数。我们证明了两个影响至关重要的下一代大规模，低温GW探测器（DUAL探测器）：a）减少的贡献“本地”的磁化率由于平均在一个大的询问区域。由于折叠法布里-珀罗腔的第一实施方式，在光热响应上测量这种效果; b）由于声学模式之间的负干扰，“反作用减少”。此外，我们通过辐射压力获得振荡模式的主动冷却，在所描述的机械装置上，该机械装置比先前展示的辐射压力冷却系统重几个数量级。
英文摘要：
The next generation of gravitational wave (gw) detectors is expected to fully enter into the quantum regime of force and displacement detection. With this aim, it is important to scale up the experiments on opto-mechanical effects from the microscopic regime to large mass systems and test the schemes that should be applied to reach the quantum regime of detection. In this work we present the experimental characterization of a prototype of massive gw detector, composed of two oscillators with a mass of the order of the kg, whose distance is read by a high finesse optical cavity. The mechanical response function is measured by exciting the oscillators though modulated radiation pressure. We demonstrate two effects crucial for the next generation of massive, cryogenic gw detectors (DUAL detectors): a) the reduction of the contribution of 'local' susceptibility thanks to an average over a large interrogation area. Such effect is measured on the photo-thermal response thanks to the first implementation of a folded-Fabry-Perot cavity; b) the 'back-action reduction' due to negative interference between acoustic modes. Moreover, we obtain the active cooling of an oscillation mode through radiation pressure, on the described mechanical device which is several orders of magnitude heavier than previously demonstrated radiation-pressure cooled systems.
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