title: Waveguide grating mirror in a fully suspended 10 meter Fabry-Perot cavity.
abstract: We report on the first demonstration of a fully suspended 10 m Fabry-Perot cavity incorporating a waveguide grating as the coupling mirror. The cavity was kept on resonance by reading out the length fluctuations via the Pound-Drever-Hall method and employing feedback to the laser frequency. From the achieved finesse of 790 the grating reflectivity was determined to exceed 99.2% at the laser wavelength of 1064 nm, which is in good agreement with rigorous simulations. Our waveguide grating design was based on tantala and fused silica and included a ≈ 20 nm thin etch stop layer made of Al2O3 that allowed us to define the grating depth accurately and preserve the waveguide thickness during the fabrication process. Demonstrating stable operation of a waveguide grating featuring high reflectivity in a suspended low-noise cavity, our work paves the way for the potential application of waveguide gratings as mirrors in high-precision interferometry, for instance in future gravitational wave observatories.
authors.affiliation: Max-Planck-Institut f¨ur Gravitationsphysik, Albert-Einstein-Institut) and Institut fürGravitationsphysik, Leibniz Universit¨at Hannover, Callinstrasse 38, 30167 Hannover, Germany. Daniel.Friedrich@aei.mpg.de
authors.forename: Daniel
authors.initials: D
authors.lastname: Friedrich
authors.forename: Bryan W
authors.initials: BW
authors.lastname: Barr
authors.forename: Frank
authors.initials: F
authors.lastname: Brückner
authors.forename: Stefan
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authors.lastname: Hild
authors.forename: John
authors.initials: J
authors.lastname: Nelson
authors.forename: John
authors.initials: J
authors.lastname: Macarthur
authors.forename: Michael V
authors.initials: MV
authors.lastname: Plissi
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Edgar
authors.forename: Sabina H
authors.initials: SH
authors.lastname: Huttner
authors.forename: Borja
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authors.lastname: Sorazu
authors.forename: Stefanie
authors.initials: S
authors.lastname: Kroker
authors.forename: Michael
authors.initials: M
authors.lastname: Britzger
authors.forename: Ernst-Bernhard
authors.initials: EB
authors.lastname: Kley
authors.forename: Karsten
authors.initials: K
authors.lastname: Danzmann
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann
authors.forename: Ken A
authors.initials: KA
authors.lastname: Strain
authors.forename: Roman
authors.initials: R
authors.lastname: Schnabel