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Phys. Rev. Lett. 97, 151103 (2006) [4 pages]

Interferometers for Displacement-Noise-Free Gravitational-Wave Detection

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Yanbei Chen, Archana Pai, and Kentaro Somiya
Max-Planck Institut für Gravitationsphysik, Am Mühlenberg 1, 14476 Potsdam, Germany

Seiji Kawamura and Shuichi Sato
TAMA project, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

Keiko Kokeyama
Ochanomizu University, 2-1-1, Otsuka, Bunkyo-ku, Tokyo, 112-8610 Japan

Robert L. Ward
LIGO Project 18-34, California Institute of Technology, Pasadena, California 91125, USA

Keisuke Goda and Eugeniy E. Mikhailov
LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Received 25 May 2006; published 13 October 2006

We propose a class of displacement- and laser-noise-free gravitational-wave-interferometer configurations, which does not sense nongeodesic mirror motion and laser noise, but provides a nonvanishing gravitational-wave signal. Our interferometers consist of four mirrors and two beam splitters, which form four Mach-Zehnder interferometers. By contrast to previous works, no composite mirrors with multiple reflective surfaces are required. Each mirror in our configuration is sensed redundantly, by at least two pairs of incident and reflected beams. Displacement- and laser-noise-free detection is achieved when output signals from these four interferometers are combined appropriately. Our 3-dimensional interferometer configuration has a low-frequency response proportional to f2, which is better than the f3 achievable by previous 2-dimensional configurations.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.151103
DOI:
10.1103/PhysRevLett.97.151103
PACS:
04.80.Nn, 06.30.Ft, 95.55.Ym
 
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