失谐信号回收干涉仪的局部读出增强
Local readout enhancement for detuned signal-recycling interferometers
摘要：
受Braginsky，Gorodetsky和Khalili的光棒方案的启发，我们提出在高功率失谐信号回收干涉仪中加入一个测量臂腔前镜运动的局部读出方案。在低频率下，该镜在引力波的影响下与臂腔端镜一起移动。该方案显著提高了光弹簧干涉仪的低频量子噪声限制灵敏度，可以被认为是将光棒方案纳入目前计划的第二代干涉仪中。另一方面，它可以被视为光学棒方案的扩展。以紧凑的二进制inspiral信号为例，我们说明了如何使用该方案可以用来提高计划中的高级LIGO干涉仪的灵敏度，在各种情况下，使用现实的经典噪声预算。我们还讨论了如何在先进的LIGO相对容易地实现这个计划。
英文摘要：
Motivated by the optical-bar scheme of Braginsky, Gorodetsky and Khalili, we propose to add to a high power detuned signal-recycling interferometer a local readout scheme which measures the motion of the arm-cavity front mirror. At low frequencies this mirror moves together with the arm-cavity end mirror, under the influence of gravitational waves. This scheme improves the low-frequency quantum-noise-limited sensitivity of optical-spring interferometers significantly and can be considered as a incorporation of the optical-bar scheme into currently planned second-generation interferometers. On the other hand it can be regarded as an extension of the optical bar scheme. Taking compact-binary inspiral signals as an example, we illustrate how this scheme can be used to improve the sensitivity of the planned Advanced LIGO interferometer, in various scenarios, using a realistic classical-noise budget. We also discuss how this scheme can be implemented in Advanced LIGO with relative ease.
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