Control of a filter cavity with coherent control sidebands
Control of a filter cavity with coherent control sidebands
复制标题
具有相干控制边带的滤波器腔的控制
DOI：
10.1103/physrevd.102.042003
复制
发表时间：
2020
影响因子：
5
通讯作者：
Flaminio Raffaele
中科院分区：
文献类型：
--
作者：
Aritomi Naoki;Leonardi Matteo;Capocasa Eleonora;Zhao Yuhang;Flaminio Raffaele
对于引力波探测器的宽带量子噪声降低，使用滤波腔实现的频率相关压缩真空态是一种成熟的技术，将从第四次观测运行开始在Advanced LIGO和Advanced Virgo中实现。为了获得频率相关压缩的好处，必须精确地控制滤波腔相对于压缩真空态的失谐和对准。为此，我们提出了一种新的长度和取向控制方案，使用相干控制边带已经被用来控制压缩角。由于压缩真空态和相干控制边带具有相同的模式匹配条件和几乎相同的频率，该方案可以精确地控制滤波腔的失谐和对准。在本文中，我们展示了这个方案的原理和它的应用引力波探测器。
For broadband quantum noise reduction of gravitational-wave detectors, frequency-dependent squeezed vacuum states realized using a filter cavity is a mature technique and will be implemented in Advanced LIGO and Advanced Virgo from the fourth observation run. To obtain the benefit of frequency-dependent squeezing, detuning and alignment of the filter cavity with respect to squeezed vacuum states must be controlled accurately. To this purpose, we suggest a new length and alignment control scheme, using coherent control sidebands which are already used to control the squeezing angle. Since both squeezed vacuum states and coherent control sidebands have the same mode matching conditions and almost the same frequency, detuning and alignment of the filter cavity can be controlled accurately with this scheme. In this paper, we show the principle of this scheme and its application to a gravitational-wave detector.