Angular instability due to radiation pressure in the LIGO gravitational wave detector

Details Angular instability due to radiation pressure in the LIGO gravitational wave detector Angular instability due to radiation pressure in the LIGO gravitational wave detector

2009-08-31

arxiv.org/abs/0909.0010v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Submitted to Applied Optics

Scientific paper

We observed the effect of radiation pressure on the angular sensing and control system of the Laser Interferometer Gravitational-Wave Observatory (LIGO) interferometer's core optics at LIGO Hanford Observatory. This is the first measurement of this effect in a complete gravitational wave interferometer. Only one of the two angular modes survives with feedback control, since the other mode is suppressed when the control gain is sufficiently large. We developed a mathematical model to understand the physics of the system. This model matches well the dynamics that we observe.

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