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Precise calibration of LIGO test mass actuators using photon radiation pressure

Goetz, E. and Kalmus, P. and Erickson, S. and Savage, R. L., Jr. and Gonzalez, G. and Kawabe, K. and Landry, M. and Marka, S. and O'Reilly, B. and Riles, K. and Sigg, D. and Willems, P. (2009) Precise calibration of LIGO test mass actuators using photon radiation pressure. Classical and Quantum Gravity, 26 (24). Art. No. 245011. ISSN 0264-9381.

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Precise calibration of kilometer-scale interferometric gravitational wave detectors is crucial for source localization and waveform reconstruction. A technique that uses the radiation pressure of a power-modulated auxiliary laser to induce calibrated displacements of one of the ~10 kg arm cavity mirrors, a so-called photon calibrator, has been demonstrated previously and has recently been implemented on the LIGO detectors. In this paper, we discuss the inherent precision and accuracy of the LIGO photon calibrators and several improvements that have been developed to reduce the estimated voice coil actuator calibration uncertainties to less than 2% (1σ). These improvements include accounting for rotation-induced apparent length variations caused by interferometer and photon calibrator beam centering offsets, absolute laser power measurement using temperature-controlled InGaAs photodetectors mounted on integrating spheres and calibrated by NIST, minimizing errors induced by localized elastic deformation of the mirror surface by using a two-beam configuration with the photon calibrator beams symmetrically displaced about the center of the optic and simultaneously actuating the test mass with voice coil actuators and the photon calibrator to minimize fluctuations caused by the changing interferometer response. The photon calibrator is able to operate in the most sensitive interferometer configuration, and is expected to become a primary calibration method for future gravitational wave searches.

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Additional Information:© 2009 IOP Publishing Ltd. Print publication: Issue 24 (21 December 2009) Received 2 September 2009, in final form 15 October 2009 Published 25 November 2009. We gratefully acknowledge the LIGO calibration team and M Rakhmanov for insightful discussions. We thank A Effler, C Gray, D Hoak and D Lormand for their technical assistance and JHadler at theNational Institute of Standards and Technology for his advice and assistance with absolute power calibration. We gratefully acknowledge the support of the National Science Foundation under grant PHY-0555406, PHY-0605496 and PHY-0905184. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from theNational Science Foundation and operates under cooperative agreement PHY-0107417. This document has been assigned LIGO Laboratory document number P080118.
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Issue or Number:24
Classification Code:PACS numbers: 95.55.Ym, 04.80.−y, 04.80.Nn, 06.30.Bp
Record Number:CaltechAUTHORS:20100119-085253031
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Official Citation:Precise calibration of LIGO test mass actuators using photon radiation pressure E Goetz, P Kalmus, S Erickson, R L Savage Jr, G Gonzalez, K Kawabe, M Landry, S Marka, B O'Reilly, K Riles, D Sigg and P Willems 2009 Class. Quantum Grav. 26 245011 (13pp) doi: 10.1088/0264-9381/26/24/245011
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17204
Deposited By: Ruth Sustaita
Deposited On:25 Jan 2010 19:33
Last Modified:03 Oct 2019 01:24

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