地面引力波探测器中光学机械参数不稳定性的预测
Towards optomechanical parametric instabilities prediction in ground-based gravitational wave detectors
摘要：
为了提高干涉型引力波探测器的灵敏度，必须提高激光功率。然而，光学机械参数不稳定性可以限制该功率。理解和描述影响这些不稳定性的许多参数和效应是非常重要的。在这里，我们以高精度对这些参数不稳定性中涉及的光学和机械模式进行建模，以便我们的模型可以预测。作为一个例子，我们进行模拟的高级处女座干涉仪（O3配置）。特别是，我们通过结合现场测量和有限元分析，以前所未有的细节和精度计算机械模式损耗。我们还研究了反射镜有限尺寸效应对光学模式和参量增益的影响，以及热吸收引起的反射镜变形。我们表明，这些影响起着重要的作用，如果横向光学模式的阶数高于四个参与的不稳定性过程。
英文摘要：
Increasing the laser power is essential to improve the sensitivity of interferometric gravitational wave detectors. However, optomechanical parametric instabilities can set a limit to that power. It is of major importance to understand and characterize the many parameters and effects that influence these instabilities. Here, we model with a high degree of precision the optical and mechanical modes that are involved in these parametric instabilities, such that our model can become predictive. As an example, we perform simulations for the Advanced Virgo interferometer (O3 configuration). In particular we compute mechanical modes losses by combining both on-site measurements and finite element analysis with unprecedented level of detail and accuracy. We also study the influence on optical modes and parametric gains of mirror finite size effects, and mirror deformations due to thermal absorption. We show that these effects play an important role if transverse optical modes of order higher than four are involved in the instability process.
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