We present the analysis of undesirable effect of parametric instability in the signal recycled
GEO 600 interferometer. This effect leads to the excitation of the additional (Stokes) optical mode,
having frequency &ohgr;1, and the mirror elastic mode, having frequency &ohgr;m. This happens when the
optical energy stored in the main interferometer mode, having frequency &ohgr;0, exceeds a certain
threshold and the detuning &Dgr; = &ohgr;0 - &ohgr;1 - &ohgr;m is small. We discuss the potential of observing the effect of parametric instability and its precursors in GEO 600 interferometer. This approach provides the best option to get familiar with this phenomenon, to develop experimental methods to depress it and to test the effectiveness of these methods in situ.
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