Photon-pressure-induced test mass deformation in gravitational-wave detectors
A widely used assumption within the gravitational-wave community has so far been that a test mass acts like a rigid body for frequencies in the detection band, i.e. for frequencies far below the first internal resonance. In this paper, we demonstrate that localized forces, applied for example by a photon pressure actuator, can result in a non-negligible elastic deformation of the test masses. For a photon pressure actuator setup used in the gravitational-wave detector GEO 600, we measured that this effect modifies the standard response function by 10% at 1 kHz and about 100% at 2.5 kHz.
© Institute of Physics and IOP Publishing Limited 2007. Received 9 August 2007, in final form 28 September 2007. Published 6 November 2007. Print publication: Issue 22 (21 November 2007). The authors are grateful for the support from PPARC and the University of Glasgow in UK, and the BMBF and the state of Lower Saxony in Germany. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation and operates under agreement PHY-0107417. In addition, we would like to thank R Savage, P Kalmus, E Goetz, MLandry, B O'Reilly and the ILIAS collaboration for many fruitful discussions about the photon pressure calibrators. This paper has LIGO document number LIGO-P070074-00-Z.
Published - HILcqg07.pdf