title: Reduction of thermal fluctuations in a cryogenic laser interferometric gravitational wave detector.
abstract: The thermal fluctuation of mirror surfaces is the fundamental limitation for interferometric gravitational wave (GW) detectors. Here, we experimentally demonstrate for the first time a reduction in a mirror's thermal fluctuation in a GW detector with sapphire mirrors from the Cryogenic Laser Interferometer Observatory at 17 and 18 K. The detector sensitivity, which was limited by the mirror's thermal fluctuation at room temperature, was improved in the frequency range of 90 to 240 Hz by cooling the mirrors. The improved sensitivity reached a maximum of 2.2×10(-19) m/√Hz at 165 Hz.
authors.affiliation: Kamioka Observatory, Institute for Cosmic Ray Research, The University of Tokyo, 456 Higashi-Mozumi, Kamioka, Hida Gifu 506-1205, Japan. uchiyama@icrr.u-tokyo.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Uchiyama
authors.forename: Shinji
authors.initials: S
authors.lastname: Miyoki
authors.forename: Souichi
authors.initials: S
authors.lastname: Telada
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Masatake
authors.initials: M
authors.lastname: Ohashi
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Agatsuma
authors.forename: Koji
authors.initials: K
authors.lastname: Arai
authors.forename: Masa-Katsu
authors.initials: MK
authors.lastname: Fujimoto
authors.forename: Tomiyoshi
authors.initials: T
authors.lastname: Haruyama
authors.forename: Seiji
authors.initials: S
authors.lastname: Kawamura
authors.forename: Osamu
authors.initials: O
authors.lastname: Miyakawa
authors.forename: Naoko
authors.initials: N
authors.lastname: Ohishi
authors.forename: Takanori
authors.initials: T
authors.lastname: Saito
authors.forename: Takakazu
authors.initials: T
authors.lastname: Shintomi
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Suzuki
authors.forename: Ryutaro
authors.initials: R
authors.lastname: Takahashi
authors.forename: Daisuke
authors.initials: D
authors.lastname: Tatsumi