能量回收干涉型引力波天线的读出与控制
Readout and Control of a Power-recycled Interferometric Gravitational-wave Antenna
摘要：
干涉引力波天线是基于迈克耳孙干涉仪，其灵敏度小差分长度变化已通过添加多个耦合光学谐振器增强。光学腔的使用对于达到所需的灵敏度是必不可少的，但对必须保持腔接近谐振的控制系统提出了挑战。激光干涉仪引力波天文台（LIGO）的应变灵敏度目标是10^-21 rms，在以150 Hz为中心的100 Hz带宽上积分。我们提出的LIGO长度和频率传感和控制系统的主要设计特点，将保持差分长度在5 10^-14米的工作点。我们还强调了噪声耦合到引力波读出信号和所需的免疫力对他们的限制。
英文摘要：
Interferometric gravitational wave antennas are based on Michelson interferometers whose sensitivity to small differential length changes has been enhanced by adding multiple coupled optical resonators. The use of optical cavities is essential for reaching the required sensitivity, but sets challenges for the control system which must maintain the cavities near resonance. The goal for the strain sensitivity of the Laser Interferometer Gravitational-wave Observatory (LIGO) is 10^-21 rms, integrated over a 100 Hz bandwidth centered at 150 Hz. We present the major design features of the LIGO length and frequency sensing and control system which will hold the differential length to within 5 10^-14 m of the operating point. We also highlight the restrictions imposed by couplings of noise into the gravitational wave readout signal and the required immunity against them.
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