Thermal correction of astigmatism in the gravitational wave observatory GEO600

Wittel, H, Lück, H, Affeldt, C, Dooley, Katherine ORCID: https://orcid.org/0000-0002-1636-0233, Grote, H, Leong, J R, Prijatelj, M, Schreiber, E, Slutsky, J, Strain, K, Was, M, Willke, B and Danzmann, K 2014. Thermal correction of astigmatism in the gravitational wave observatory GEO600. Classical and Quantum Gravity 31 (6) , 065008. 10.1088/0264-9381/31/6/065008

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Abstract

The output port of GEO 600 is dominated by unwanted high order modes (HOMs). The current thermal actuation system, a ring heater behind one of the folding mirrors, causes a significant amount of astigmatism, which produces HOMs. We have built and installed an astigmatism correction system, based on heating this folding mirror at the sides (laterally). With these side heaters and the ring heater behind the mirror, it is possible to tune its radius of curvature in the horizontal and the vertical degree of freedom. We use this system to match the mirrors in the two arms of GEO 600 to each other, thereby reducing the contrast defect. The use of the side heaters reduces the power of the HOMs at the output of GEO 600 by approximately 37%.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	IOP Publishing
ISSN:	0264-9381
Date of Acceptance:	21 January 2014
Last Modified:	23 Oct 2022 12:49
URI:	https://orca.cardiff.ac.uk/id/eprint/108788

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