paper

Stabilization of a Fabry-Perot interferometer using a suspension-point interferometer

arXiv:gr-qc/0404048 · doi:10.1016/j.physleta.2004.04.066

Abstract

A suspension-point interferometer (SPI) is an auxiliary interferometer for active vibration isolation, implemented at the suspension points of the mirrors of an interferometric gravitational wave detector. We constructed a prototype Fabry-Perot interferometer equipped with an SPI and observed vibration isolation in both the spectrum and transfer function. The noise spectrum of the main interferometer was reduced by 40 dB below 1 Hz. Transfer function measurements showed that the SPI also produced good vibration suppression above 1 Hz. These results indicate that SPI can improve both the sensitivity and the stability of the interferometer.

14 pages, 8 figures; added discussion; to be published in Physics Letters A

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