Title: Parametric Oscillatory Instability in a Fabry-Perot Cavity of the Einstein Telescope with different mirror's materials,
Abstract: We discuss the parametric oscillatory instability in a Fabry-Perot cavity of
the Einstein Telescope. Unstable combinations of elastic and optical modes for
two possible configurations of gravitational wave third-generation detector are
deduced. The results are compared with the results for gravita- tional wave
interferometers LIGO and LIGO Voyager.