Thermal modulation for suppression of parametric instability in advanced gravitational wave detectors

Y. Q. Ma, J. Liu, Yiqiu Ma, C. Zhao, L. Ju, D. G. Blair, Z. H. Zhu

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    Three-mode parametric instability is a threat to attaining design power levels in advanced gravitational wave detectors. The first observation of three-mode parametric instability in a long optical cavity revealed that instabilities could be suppressed by time variation of the mirror radius of curvature. In this paper, we present three dimensional finite element analysis of this thermo-acousto-optics system to determine whether thermal modulation could provide sufficient instability suppression without degrading time averaged optical performance. It is shown that deformations due to the time averaged heating profile on the mirror surface can be compensated by rear surface heating of the test mass. Results show that a heating source with a modulation amplitude of 1 W at 0.01 Hz is sufficient to stabilize an acoustic mode with parametric gain up to 3. The parametric gain suppression factor is linearly proportional to the peak modulation power.

    Original languageEnglish
    Article number135001
    Number of pages11
    JournalClassical and Quantum Gravity
    Volume34
    Issue number13
    DOIs
    Publication statusPublished - 5 Jun 2017

    Fingerprint

    Dive into the research topics of 'Thermal modulation for suppression of parametric instability in advanced gravitational wave detectors'. Together they form a unique fingerprint.

    Cite this