OPTOMECHANICAL PARAMETRIC INSTABILITIES STUDY FOR VIRGO O3 RUN

摘要: In 2015, during the Observing Run 1 (O1), an optomechanical parametric instability was experienced in LIGO for the first time1: a mirror mechanical mode at 15 kHz became unstable under the effect of radiation pressure, for an intracavity power of 50 kW. The same phenomenon was expected to be observed in Virgo, however, it has not been the case yet, even for an intracavity power of 100 kW. Here, we predict the parametric gain for each mechanical modes of the four suspended test masses of the Virgo configuration. We show that for the Observing Run 3 (O3) nominal intracavity power (100 kW) it is very unlikely to observe a parametric instability.