Measurement of optical losses in a high-finesse 300 m filter cavity for broadband quantum noise reduction in gravitational-wave detectors
Measurement of optical losses in a high-finesse 300 m filter cavity for broadband quantum noise reduction in gravitational-wave detectors
复制标题
测量高精度 300 m 滤波器腔中的光学损耗，以降低引力波探测器中的宽带量子噪声
DOI：
10.1103/physrevd.98.022010
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
and R. Flaminio
中科院分区：
文献类型：
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作者：
E. Capocasa;Y. Guo;M. Eisenmann;Y. Zhao;A. Tomura;K. Arai;Y. Aso;M. Marchio;L. Pinard;P. Prat;K. Somiya;R. Schnabel;M. Tacca;R. Takahashi;D. Tatsumi;M. Leonardi;M. Barsuglia;and R. Flaminio
地球上的引力波探测器将在很大一部分频谱上受到量子噪声的限制。实现这类噪声宽带抑制的最有希望的技术是从探测器的输出端注入随频率变化的压缩真空态，其压缩角通过法布里-珀罗滤光腔的反射旋转。限制压缩性能的最重要参数之一是滤光腔的光学损耗。本文报道了安装在日本国家天文台的300米滤光腔样机的运行情况。该腔被设计成获得低于100赫兹的挤压角旋转。在用多波长技术实现腔的共振后，往返损耗被测得在50ppm到90ppm之间。这一结果表明，在对输入压缩因子和其他光学损耗进行现实假设的情况下，在辐射压力占主导地位的频率区可以实现至少4%的量子噪声降低。
Earth-based gravitational-wave detectors will be limited by quantum noise in a large part of their spectrum. The most promising technique to achieve a broadband reduction of such noise is the injection of a frequency-dependent squeezed vacuum state from the output port of the detector, with the squeeze angle rotated by the reflection off a Fabry-Perot filter cavity. One of the most important parameters limiting the squeezing performance is represented by the optical losses of the filter cavity. We report here the operation of a 300 m filter cavity prototype installed at the National Astronomical Observatory of Japan. The cavity is designed to obtain a rotation of the squeeze angle below 100 Hz. After achieving the resonance of the cavity with a multiwavelength technique, the round trip losses have been measured to be between 50 and 90 ppm. This result demonstrates that with realistic assumptions on the input squeeze factor and the other optical losses, a quantum noise reduction of at least 4 dB in the frequency region dominated by radiation pressure can be achieved.