The Advanced LIGO Photon Calibrators

S. Karki (1; 2); D. Tuyenbayev (2; 3); S. Kandhasamy (4; 5); B. P. Abbott (6); T. D. Abbott (7); E. H. Anders (2); J. Berliner (2); J.; Betzwieser (5); H. P. Daveloza (3); C. Cahillane (6); L. Canete (2); C.; Conley (2; 6); J. R. Gleason (8); E. Goetz (2; 6); J. S. Kissel (2); K.; Izumi (2); G. Mendell (2); V. Quetschke (3); M. Rodruck (2); S. Sachdev (6),; T. Sadecki (2); P. B. Schwinberg (2); A. Sottile (2; 9); M. Wade (10); A.; J. Weinstein (6); M. West (2; 11); R. L. Savage (2) ((1) University of; Oregon; (2) LIGO Hanford Observatory; (3) University of Texas Rio Grande; Valley; (4) University of Missisipi; (5) LIGO Livingston Observatory; (6); California Institute of Technology; (7) Louisiana State University; (8); University of Florida; Gainesville; FL; USA; (9) University of Pisa; (10); Kenyon College; (11) Syracuse University)

arXiv:1608.05055·astro-ph.IM·December 21, 2016

The Advanced LIGO Photon Calibrators

S. Karki (1, 2), D. Tuyenbayev (2, 3), S. Kandhasamy (4, 5), B. P. Abbott (6), T. D. Abbott (7), E. H. Anders (2), J. Berliner (2), J., Betzwieser (5), H. P. Daveloza (3), C. Cahillane (6), L. Canete (2), C., Conley (2, 6), J. R. Gleason (8), E. Goetz (2, 6), J. S. Kissel (2)

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TL;DR

This paper discusses the design, implementation, and operation of upgraded Photon Calibrators for Advanced LIGO, enabling highly accurate calibration essential for gravitational wave detection and parameter estimation.

Contribution

It introduces the redesigned Advanced LIGO Photon Calibrators with significant upgrades meeting the stringent calibration requirements of second-generation detectors.

Findings

01

Achieved calibration accuracy better than 1%.

02

Provided fiducial displacements of about 10^{-18} m/√Hz.

03

Enabled precise gravitational wave measurements.

Abstract

The two interferometers of the Laser Interferometry Gravitaional-wave Observatory (LIGO) recently detected gravitational waves from the mergers of binary black hole systems. Accurate calibration of the output of these detectors was crucial for the observation of these events, and the extraction of parameters of the sources. The principal tools used to calibrate the responses of the second-generation (Advanced) LIGO detectors to gravitational waves are systems based on radiation pressure and referred to as Photon Calibrators. These systems, which were completely redesigned for Advanced LIGO, include several significant upgrades that enable them to meet the calibration requirements of second-generation gravitational wave detectors in the new era of gravitational-wave astronomy. We report on the design, implementation, and operation of these Advanced LIGO Photon Calibrators that are…

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