第三代引力波探测器参量振荡不稳定性的抑制
Suppression of parametric oscillatory instability in third generation gravitational wave detectors
摘要:
讨论了通过确定干涉仪反射镜的最佳曲率半径来抑制下一代引力波探测器法布里-珀罗腔中参量振荡不稳定性的非线性效应的一种可能方法。通过改变反射镜的曲率半径,我们可以改变法布里-珀罗谐振腔的光学模式的频率和光学模式中的光场分布,这反过来又可以改变不稳定模式的数量,从而导致参数振荡不稳定性。确定了利用热透镜减少不稳定模数目的最佳反射镜曲率半径。
英文摘要:
We discuss one possible method for suppression of the nonlinear effect of a parametric oscillatory instability in a Fabry-Perot cavity of the next generation of gravitational wave detectors by determination of optimal radii of curvature of interferometers' mirrors. Varying the radii of curvature of the mirrors we can change the frequencies of the optical modes of the Fabry-Perot resonators and distributions of optical fields in optical modes, which, in turn, can change the number of unstable modes, leading to parametric oscillatory instability. The determination of the optimal values of the radii of curvature of mirrors to reduce the number of unstable modes by thermal lensing is fulfilled.
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