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Reduction of higher order mode generation in large scale gravitational wave interferometers by central heating residual aberration correction

R.A. Day 1 G. Vajente 2 M. Kasprzack 3 J. Marque 1
1 EGO - European gravitational Observatory
2 INFN - Istituto Nazionale di Fisica Nucleare [Pisa]
3 Virgo
LAL - Laboratoire de l'Accélérateur Linéaire
Abstract : Imperfect cavity mirrors in the arms of an interferometric gravitational-wave (GW) detector can result in the generation of unwanted higher order modes that are close to or at resonance in the cavity. This can lead to many undesirable effects such as increased round-trip losses or degraded contrast defect. Polishing mirrors to fulfill the requirements of 2nd generation GW interferometers is extremely challenging. For the use of LG33 modes in 3rd generation detectors it would be necessary to improve polishing by an order of magnitude. In this article we present a novel technique for the in situ correction of cavity mirror surface figures by central heating residual aberration correction. This system targets and corrects specific features of the mirror surface figure such as to reduce scattering from the fundamental cavity mode to specific higher order modes by more than an order of magnitude. We demonstrate, by simulation, the feasibility of such a system and give examples of its application to 2nd and 3rd generation GW interferometers.
Keywords : Thermal noise
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Journal articles
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http://hal.in2p3.fr/in2p3-00828223
Contributor : Sabine Starita <>
Submitted on : Thursday, May 30, 2013 - 3:19:30 PM
Last modification on : Wednesday, October 14, 2020 - 3:59:44 AM

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R.A. Day, G. Vajente, M. Kasprzack, J. Marque. Reduction of higher order mode generation in large scale gravitational wave interferometers by central heating residual aberration correction. Physical Review D, American Physical Society, 2013, 87, pp.082003. ⟨10.1103/PhysRevD.87.082003⟩. ⟨in2p3-00828223⟩

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