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Modulated differential wavefront sensing: alignment scheme for beams with large higher order mode content

Bisht, A., Prijatelj, M., Leong, J., Schreiber, E., Affeldt, C., Brinkmann, M., Doravari, S., Grote, H. ORCID:, Kringel, V., Lough, J., Lueck, H., Strain, K., Weinert, M., Wittel, H. and Danzmann, K. 2020. Modulated differential wavefront sensing: alignment scheme for beams with large higher order mode content. Galaxies 8 (4) , 81. 10.3390/galaxies8040081

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Modulated differential wavefront sensing (MDWS) is an alignment control scheme in the regime of beams with strong higher order transversal modes (HOMs). It is based on the differential wavefront sensing (DWS) technique. MDWS represents a significant upgrade over conventional techniques used in the presence of high HOM content as it allows for higher control bandwidths while eliminating the need of auxiliary alignment modulations, that otherwise cause loss of applied squeezing. The output port of gravitational wave (GW) interferometers (IFO) is one such place where a lot of HOMs are present. These are filtered out by a cavity called the output mode cleaner (OMC), whose alignment gets challenging due to the presence of HOMs. In this paper, we present the first demonstration of the MDWS scheme for aligning the fundamental mode from the IFO to the OMC at the gravitational wave detector-GEO 600.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Additional Information: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution CC BY 4.0
Publisher: MDPI
ISSN: 2075-4434
Date of First Compliant Deposit: 4 December 2020
Date of Acceptance: 27 November 2020
Last Modified: 04 May 2023 22:12

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