Demonstration and comparison of tuned and detuned signal recycling in a large-scale gravitational wave detector
Demonstration and comparison of tuned and detuned signal recycling in a large-scale gravitational wave detector
复制标题
大型引力波探测器中调谐和失谐信号回收的演示和比较
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
K. Danzmann
中科院分区：
文献类型：
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作者：
S. Hild;H. Grote;M. Hewitson;H. Lück;J. R. Smith;K. Strain;B. Willke;K. Danzmann
位于德国汉诺威附近的英国/德国引力波探测器GEO 600是第一个采用先进信号回收技术的大型引力波探测器。目前该仪器在失谐信号回收模式下运行。由于信号循环腔改变了暗端口处存在的所有光场（载波和边带）的幅度和相位，因此出现了一些问题。此外，在失谐信号循环的情况下，这会导致检测器输出处不平衡的边带场。这种不对称性引起的大幅度调制不携带任何引力波信息，但可能是主光电二极管饱和和非线性的原因。我们开发并演示了一种新的控制方法，可以在大型引力波探测器中实现调谐信号回收操作。给出了调谐和失谐信号回收操作的详细比较。测量并比较系统的响应函数（光增益）以及主光电二极管的幅度调制大小。测量了一些重要的噪声耦合，发现在调谐信号回收操作的情况下，部分噪声耦合大大降低。
The British/German gravitational wave detector GEO 600 located near Hannover in Germany is the first large-scale gravitational-wave detector using the advanced technique of signal recycling. Currently the instrument operates in detuned signal recycling mode. Several problems arise due to the fact that the signal recycling cavity changes amplitude and phase of all light fields (carrier and sidebands) present at the dark-port. In addition, in the case of detuned signal recycling this leads to unbalanced sideband fields at the detector output. The large amplitude modulation caused by this asymmetry does not carry any gravitational wave information, but might be the cause of saturation and nonlinearities on the main photodiode. We developed and demonstrated a new control method to realize tuned signal recycling operation in a large-scale gravitational wave detector. A detailed comparison of tuned and detuned signal recycling operation is given. The response function of the system (optical gain) was measured and compared, as was the size of amplitude modulation on the main photodiode. Some important noise couplings were measured and partly found to be strongly reduced in the case of tuned signal recycling operation.