Study of three-mode parametric instability

作     者：Fengchao Liang Chunnong Zhao Slawomir Gras Li Ju D G Blair 

作者机构：School of Physics University of Western Australia 35 Stirling Highway Crawley Western Australia 6009 Australia Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China 

出 版 物：《Journal of Physics: Conference Series》 

年 卷 期：2010年第228卷第1期

学科分类：07[理学] 0702[理学-物理学] 

摘      要：The effect of parametric instability in advanced interferometric gravitational wave detectors is a potential problem for their proper operation. Great efforts have been made to study the onset of parametric instabilities and to find ways to control them. Here we present an experimental design for studying parametric instability in a 72 m cavity with suspended high quality fused silica mirrors. With 5 W input power and 20 kW circulation power inside the cavity, it is predicted that parametric instability will occur. The resonant condition of parametric instability can be met by thermally tuning the radius of curvature of a test mass. We will present simulation results of parametric gains for different radii of curvature of a test mass. The simulation results will provide the basis for designing the thermal tuning and observation parametric instability experiments. This will provide a test bed for studying parametric instability and its control for next generation detectors.