Squeezed-input, optical-spring, signal-recycled gravitational-wave detectors
Squeezed-input, optical-spring, signal-recycled gravitational-wave detectors
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DOI：
10.1103/physrevd.68.042001
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发表时间：
2003-03
影响因子：
5
通讯作者：
J. Harms;Yanbei Chen;S. Chelkowski;A. Franzen;H. Vahlbruch;K. Danzmann;R. Schnabel
中科院分区：
文献类型：
--
作者：
J. Harms;Yanbei Chen;S. Chelkowski;A. Franzen;H. Vahlbruch;K. Danzmann;R. Schnabel
从理论上分析了具有附加输入和输出光学器件的信号回收激光干涉引力波探测器的量子噪声，即真空进入暗口的频变压缩和频变零差探测。我们结合联合收割机的工作，Buonanno和陈的量子噪声的信号回收干涉仪与普通的输入-输出光学，和金布尔等人的工作。得到了最优输入和输出频率依赖关系的解析公式。结果表明，在整个压缩带宽范围内，以最佳频率相关压缩角注入压缩光，可以使噪声谱密度提高exp（-2r）倍，其中r为压缩参数.它进一步表明，频率相关的（变）零差读出导致额外的灵敏度增加，这是显着的双共振结构的翅膀。在普通输出零差探测的情况下，通过在与频率无关的压缩真空上应用两个光学滤波器，可以实现最佳的变分输入压缩。在本文中，我们以目前正在GEO 600站点完成的信号回收拓扑为例。然而，这里得到的理论结果也适用于先进LIGO的拟议拓扑结构。
We theoretically analyze the quantum noise of signal-recycled laser interferometric gravitational-wave detectors with additional input and output optics, namely frequency-dependent squeezing of the vacuum entering the dark port and frequency-dependent homodyne detection. We combine the work of Buonanno and Chen on the quantum noise of signal-recycled interferometers with ordinary input-output optics, and the work of Kimble el al. on frequency-dependent input-output optics with conventional interferometers. Analytical formulas for the optimal input and output frequency dependencies are obtained. It is shown that injecting squeezed light with the optimal frequency-dependent squeezing angle into the dark port yields an improvement on the noise spectral density by a factor of exp(-2r) (in power) over the entire squeezing bandwidth, where r is the squeezing parameter. It is further shown that frequency-dependent (variational) homodyne read-out leads to an additional increase in sensitivity which is significant in the wings of the doubly resonant structure. The optimal variational input squeezing in case of an ordinary output homodyne detection is shown to be realizable by applying two optical filters on a frequency-independent squeezed vacuum. Throughout this paper, we take as example the signal-recycled topology currently being completed at the GEO600 site. However, theoretical results obtained here are also applicable to the proposed topology of Advanced LIGO.