Thermal Correction of Astigmatism in the Gravitational Wave Observatory GEO 600

Wittel, Holger; Lück, Harald; Affeldt, Christoph; Dooley, Kate; Grote, Hartmut; Leong, Jonathan; Prijatelj, Mirko; Schreiber, Emil; Slutsky, Jacob; Strain, Kenneth A.; Was, Michal; Willke, Benno; Danzmann, Karsten

doi:10.1088/0264-9381/31/6/065008

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Thermal Correction of Astigmatism in the Gravitational Wave Observatory GEO 600

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Wittel, Holger
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Lück, Harald
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Affeldt, Christoph
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Dooley, Kate
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40456

Grote, Hartmut
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Leong, Jonathan
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Prijatelj, Mirko
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40491

Schreiber, Emil
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Strain, Kenneth A.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Was, Michal
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, Hannover, DE;

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Willke, Benno
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Danzmann, Karsten
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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1311.5367.pdf
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CQG_31_6_065008.pdf
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Citation

Wittel, H., Lück, H., Affeldt, C., Dooley, K., Grote, H., Leong, J., et al. (2014). Thermal Correction of Astigmatism in the Gravitational Wave Observatory GEO 600. Classical and quantum gravity, 31(6): 065008. doi:10.1088/0264-9381/31/6/065008.

Cite as: https://hdl.handle.net/11858/00-001M-0000-001A-003A-6

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%.