Calibration of the LIGO displacement actuators via laser frequency modulation

Details Calibration of the LIGO displacement actuators via laser frequency modulation Calibration of the LIGO displacement actuators via laser frequency modulation

2010-05-20

arxiv.org/abs/1005.3746v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, 5 figures, submitted to Classical and Quantum Gravity

Scientific paper

We present a frequency modulation technique for calibration of the displacement actuators of the LIGO 4-km-long interferometric gravitational-wave detectors. With the interferometer locked in a single-arm configuration, we modulate the frequency of the laser light, creating an effective length variation that we calibrate by measuring the amplitude of the frequency modulation. By simultaneously driving the voice coil actuators that control the length of the arm cavity, we calibrate the voice coil actuation coefficient with an estimated 1-sigma uncertainty of less than one percent. This technique enables a force-free, single-step actuator calibration using a displacement fiducial that is fundamentally different from those employed in other calibration methods.

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