HARDER , Thomas

Direct detection of Gravitational Waves was demonstrated for the first time in 2015 with km-scale Michelson interferometers. In order to reduce the shot noise at high frequency of these detectors high optical power in the arm cavities is needed. At that high circulating power a nonlinear optomechanical phenomenon called parametric instability...

In this paper we propose a novel strategy to control optomechanical parametric instability (PI) in gravitational wave (GW) detectors, based on radiation pressure. The fast deflection of a high power beam is the key element of our approach. We built a 2D deflection system based on a pair of acousto-optic modulators (AOMs) that combines high...

A key action for enhancing the sensitivity of gravitational wave (GW) detectors based on laser interferometry is to increase the laser power. However, in such a high-power regime, a nonlinear optomechanical phenomenon called parametric instability (PI) leads to the amplification of the mirrors vibrational modes preventing the detector...