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In this paper we propose a novel strategy to control optomechanicalparametric instability (PI) in gravitational wave (GW) detectors, based onradiation pressure. The fast deflection of a high power beam is the key elementof our approach. We built a 2D deflection system based on a pair ofacousto-optic modulators (AOMs) that combines high rapidity and large scanrange. As fast frequency switching configurable AOM driver we used an UniversalSoftware Radio Peripheral (USRP) combined with a high performance personalcomputer (PC). In this way we demonstrate a 2D beam steering system with flatefficiency over the whole scan range and with a transition time of 50 nsbetween two arbitrary consecutive deflection positions for a beam power of 3.6W.

High speed, high power 2D beam steering for mitigation of optomechanical parametric instability in gravitational wave detectors