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Advanced gravitational wave interferometric detectors will operate at theirdesign sensitivity with nearly 1MW of laser power stored in the arm cavities.Such large power may lead to the uncontrolled growth of acoustic modes in thetest masses due to the transfer of optical energy to the mechanical modes ofthe arm cavity mirrors. These parametric instabilities have the potential ofsignificantly compromising the detector performance and control. Here wepresent the design of "acoustic mode dampers" that use the piezoelectric effectto reduce the coupling of optical to mechanical energy. Experimentalmeasurements carried on an Advanced LIGO-like test mass shown a 10-foldreduction in the amplitude of several mechanical modes, thus suggesting thatthis technique can greatly mitigate the impact of parametric instabilities inadvanced detectors.

Resonant Dampers for Parametric Instabilities in Gravitational Wave Detectors