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

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 vibrat...

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Bibliographic Details
Published in:Physics letters. A 2004-06, Vol.327 (1), p.1-8
Main Authors: Aso, Y., Ando, M., Kawabe, K., Otsuka, S., Tsubono, K.
Format: Article
Language:English
Subjects:
Active vibration isolation
Gravitational wave
Suspension point interferometer
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Summary: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.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2004.04.066