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Higher-Order Laguerre-Gauss Mode Generation and Interferometry for Gravitational Wave Detectors

Abstract : 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%.
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http://hal.in2p3.fr/in2p3-00708756
Contributor : Christelle Buy <>
Submitted on : Friday, June 15, 2012 - 4:14:26 PM
Last modification on : Wednesday, September 23, 2020 - 4:37:27 AM

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M. Granata, Christelle Lesvigne-Buy, R.L. Ward, M. Barsuglia. Higher-Order Laguerre-Gauss Mode Generation and Interferometry for Gravitational Wave Detectors. Physical Review Letters, American Physical Society, 2010, 105, pp.231102. ⟨10.1103/PhysRevLett.105.231102⟩. ⟨in2p3-00708756⟩

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