Advanced LIGO and other ground-based interferometric gravitational-wave detectors use high laser power to minimize shot noise and suspended optics to reduce seismic noise coupling. This can result in an opto-mechanical coupling which can become unstable and saturate the interferometer control systems. The severity of these parametric instabilities scales with circulating laser power and first hindered LIGO operations in 2014. Static thermal tuning and active electrostatic damping have previously been used to control parametric instabilities at lower powers but are insufficient as power is increased. Here we report the first demonstration of dynamic thermal compensation to avoid parametric instability in an Advanced LIGO detector. Annular ring heaters that compensate central heating are used to tune the optical mode away from multiple problematic mirror resonance frequencies. We develop a single-cavity approximation model to simulate the optical beat note frequency during the cen...

中文翻译：

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在高级LIGO中演示动态热补偿以抑制参数不稳定性

先进的LIGO和其他地面干涉重力波探测器使用高激光功率来最大程度地减小散粒噪声，并使用悬挂式光学器件来减少地震噪声耦合。这可能导致光机耦合，从而变得不稳定并使干涉仪控制系统饱和。这些参数不稳定性的严重性随循环激光功率的增加而缩放，并在2014年首次阻碍了LIGO的运行。以前曾使用静态热调谐和主动静电阻尼来控制较低功率下的参数不稳定性，但随着功率的增加而不足。在这里，我们报告了动态热补偿的首次演示，它可以避免高级LIGO检测器中的参数不稳定。补偿中央热量的环形加热器用于调节光学模式，使其远离多个有问题的镜面共振频率。我们开发了一个单腔近似模型来模拟中心频率下的光学拍音频率。