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Waveguide grating mirror in a fully suspended 10 meter Fabry-Perot cavity

: Friedrich, D.; Barr, B.W.; Brückner, F.; Hild, S.; Nelson, J.; Macarthur, J.; Plissi, M.V.; Edgar, M.P.; Huttner, S.H.; Sorazu, B.; Kroker, S.; Britzger, M.; Kley, E.-B.; Danzmann, K.; Tünnermann, A.; Strain, K.A.; Schnabel, R.

Postprint (3.8 MByte; PDF; )

Optics Express 19 (2011), No.16, pp.14955-14963
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()

We report on the first demonstration of a fully suspended 10m 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 1064nm, which is in good agreement with rigorous simulations. Our waveguide grating design was based on tantala and fused silica and included a ~ 20nm thin etch stop layer made of Al2O3 that allowed us to define the grating depth accurately 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.