Observation of enhanced optical spring damping in a macroscopic mechanical resonator and application for parametric instability control in advanced gravitational-wave detectors

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    Abstract

    We show that optical spring damping in an optomechanical resonator can be enhanced by injecting a phase delay in the laser frequency-locking servo to rotate the real and imaginary components of the optical spring constant. This enhances damping at the expense of optical rigidity. We demonstrate enhanced parametric damping which reduces the Q factor of a 0.1-kg-scale resonator from 1.3×105 to 6.5×103. By using this technique adequate optical spring damping can be obtained to damp parametric instability predicted for advanced laser interferometer gravitational-wave detectors.© 2008 The American Physical Society
    Original languageEnglish
    Pages (from-to)online - approx 5-20pp
    JournalPhysical Review A
    Volume77
    Issue number1
    DOIs
    Publication statusPublished - 2008

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