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Physical Review Letters 105 (2010) 231102
Higher-Order Laguerre-Gauss Mode Generation and Interferometry for Gravitational Wave Detectors
M. Granata1, C. Buy1, R.L. Ward1, M. Barsuglia1
VIRGO Collaboration(s)

We report on the first experimental demonstration of higher-order Laguerre-Gauss (LGpℓ) mode generation and interferometry using a method scalable to the requirements of gravitational wave (GW) detection. GW detectors which use higher-order LGpℓ modes will be less susceptible to mirror thermal noise, which is expected to limit the sensitivity of all currently planned terrestrial detectors. We used a diffractive optic and a mode-cleaner cavity to convert a fundamental LG00 Gaussian beam into an LG33 mode with a purity of 98%. The ratio between the power of the LG00 mode of our laser and the power of the LG33 transmitted by the cavity was 36%. By measuring the transmission of our setup using the LG00, we inferred that the conversion efficiency specific to the LG33 mode was 49%. We illuminated a Michelson interferometer with the LG33 beam and achieved a visibility of 97%.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
APC - Cosmologie et Gravitation
Physique/Astrophysique/Instrumentation et méthodes pour l'astrophysique

Planète et Univers/Astrophysique/Instrumentation et méthodes pour l'astrophysique
Gravitational wave detectors and experiments – Diffraction and scattering – Resonators – cavities – amplifiers – arrays – and rings – Beam characteristics: profile – intensity – and power – spatial pattern formation
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