title: Optical mode cleaner with suspended mirrors.
abstract: We report on the development of a new type of mode cleaner that reduces any geometric noise of the laser beam in an interferometric gravitational-wave detector. The mode cleaner is a Fabry-Perot cavity that comprises independently suspended mirrors and works as a frequency-stabilization reference as well as a mode selector; the length of the cavity is 1 m. Stand-alone tests have shown at least a 30-dB reduction in the geometric fluctuation of the beam and a 60-dB reduction of the frequency noise of the laser. We have also succeeded in operating a 20-m Fabry-Perot prototype detector (at the National Astronomical Observatory, Tokyo, Japan) by using this mode cleaner.
authors.forename: A
authors.initials: A
authors.lastname: Araya
authors.forename: N
authors.initials: N
authors.lastname: Mio
authors.forename: K
authors.initials: K
authors.lastname: Tsubono
authors.forename: K
authors.initials: K
authors.lastname: Suehiro
authors.forename: S
authors.initials: S
authors.lastname: Telada
authors.forename: M
authors.initials: M
authors.lastname: Ohashi
authors.forename: M K
authors.initials: MK
authors.lastname: Fujimoto