Parametric Instability in Advanced Laser Interferometer Gravitational Wave Detectors

Li Ju, Slawomir Gras, Chunnong Zhao, Jerome Degallaix, David Blair, N Mio (Editor)

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)


    High frequency parametric instabilities in optical cavities are radiation pressure induced interactions between test mass mechanical modes and cavity optical modes. The parametric gain depends on the cavity power and the quality factor of the test mass internal modes (usually in ultrasonic frequency range), as well as the overlap integral for the mechanical and optical modes. In advanced laser interferometers which require high optical power and very low acoustic loss test masses, parametric instabilities could prevent interferometer operation if not suppressed. Here we review the problem of parametric instabilities in advanced detector configurations for different combinations of sapphire and fused silica test masses, and compare three methods for control or suppression of parametric instabilities-thermal tuning, surface damping and active feedback.
    Original languageEnglish
    Pages (from-to)282-287
    JournalJournal of Physics: Conference Series
    Publication statusPublished - 2006


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