title: Interferometers for displacement-noise-free gravitational-wave detection.
abstract: 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.
authors.affiliation: Max-Planck Institut für Gravitationsphysik, Am Mühlenberg 1, 14476 Potsdam, Germany.
authors.forename: Yanbei
authors.initials: Y
authors.lastname: Chen
authors.forename: Archana
authors.initials: A
authors.lastname: Pai
authors.forename: Kentaro
authors.initials: K
authors.lastname: Somiya
authors.forename: Seiji
authors.initials: S
authors.lastname: Kawamura
authors.forename: Shuichi
authors.initials: S
authors.lastname: Sato
authors.forename: Keiko
authors.initials: K
authors.lastname: Kokeyama
authors.forename: Robert L
authors.initials: RL
authors.lastname: Ward
authors.forename: Keisuke
authors.initials: K
authors.lastname: Goda
authors.forename: Eugeniy E
authors.initials: EE
authors.lastname: Mikhailov