DC readout experiment in Enhanced LIGO
DC readout experiment in Enhanced LIGO
复制标题
增强型 LIGO 中的直流读出实验
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
S. Waldman
中科院分区：
文献类型：
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作者：
T. Fricke;N. Smith;R. Abbott;R. Adhikari;K. Dooley;M. Evans;P. Fritschel;V. Frolov;K. Kawabe;J. Kissel;B. Slagmolen;S. Waldman
由激光干涉引力波天文台（LIGO）操作的两个4公里长的引力波探测器于2008年进行了修改，使用零差探测的直流读出形式读出引力波通道，并在探测器的输出端包括一个光学滤波腔。作为增强型LIGO升级的一部分，这些修改取代了以前使用的射频（RF）外差系统。我们描述的动机和实施的DC读出和输出模式清洁增强LIGO。我们目前的系统的特点，包括测量和模型的耦合噪声从激光源的引力波读出通道。我们发现，使用DC读出的噪声耦合比RF读出的噪声耦合有所改善，并且我们发现，所实现的散粒噪声限制灵敏度与建模结果一致。
The two 4 km long gravitational wave detectors operated by the Laser Interferometer Gravitational-wave Observatory (LIGO) were modified in 2008 to read out the gravitational wave channel using the DC readout form of homodyne detection and to include an optical filter cavity at the output of the detector. As part of the upgrade to Enhanced LIGO, these modifications replaced the radio-frequency (RF) heterodyne system used previously. We describe the motivations for and the implementation of DC readout and the output mode cleaner in Enhanced LIGO. We present characterizations of the system, including measurements and models of the couplings of the noises from the laser source to the gravitational wave readout channel. We show that noise couplings using DC readout are improved over those for RF readout, and we find that the achieved shot-noise-limited sensitivity is consistent with modeled results.