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Open AccessConcept Paper

Modulated Differential Wavefront Sensing: Alignment Scheme for Beams with Large Higher Order Mode Content

1
Max Planck Institute for Gravitational Physics, University of Hannover, D-30167 Hannover, Germany
2
Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind Pune 411007, India
3
School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA, UK
4
SUPA, School of Physics and Astronomy, The University of Glasgow, Glasgow G12 8QQ, UK
*
Author to whom correspondence should be addressed.
These authors are all former group member at GEO 600.
Galaxies 2020, 8(4), 81; https://doi.org/10.3390/galaxies8040081
Received: 23 October 2020 / Revised: 25 November 2020 / Accepted: 27 November 2020 / Published: 3 December 2020
(This article belongs to the Special Issue Gravitational Wave Detectors)
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. View Full-Text
Keywords: HOMs; OMC; DWS; alignment; IFO; GEO 600 HOMs; OMC; DWS; alignment; IFO; GEO 600
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MDPI and ACS Style

Bisht, A.; Prijatelj, M.; Leong, J.; Schreiber, E.; Affeldt, C.; Brinkmann, M.; Doravari, S.; Grote, H.; Kringel, V.; Lough, J.; Lueck, H.; Strain, K.; Weinert, M.; Wittel, H.; Danzmann, K. Modulated Differential Wavefront Sensing: Alignment Scheme for Beams with Large Higher Order Mode Content. Galaxies 2020, 8, 81. https://doi.org/10.3390/galaxies8040081

AMA Style

Bisht A, Prijatelj M, Leong J, Schreiber E, Affeldt C, Brinkmann M, Doravari S, Grote H, Kringel V, Lough J, Lueck H, Strain K, Weinert M, Wittel H, Danzmann K. Modulated Differential Wavefront Sensing: Alignment Scheme for Beams with Large Higher Order Mode Content. Galaxies. 2020; 8(4):81. https://doi.org/10.3390/galaxies8040081

Chicago/Turabian Style

Bisht, A.; Prijatelj, M.; Leong, J.; Schreiber, E.; Affeldt, C.; Brinkmann, M.; Doravari, S.; Grote, H.; Kringel, V.; Lough, J.; Lueck, H.; Strain, K.; Weinert, M.; Wittel, H.; Danzmann, K. 2020. "Modulated Differential Wavefront Sensing: Alignment Scheme for Beams with Large Higher Order Mode Content" Galaxies 8, no. 4: 81. https://doi.org/10.3390/galaxies8040081

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