Angular instability due to radiation pressure in the LIGO gravitational-wave detector.
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, because 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 with the dynamics that we observe.
Hirose
Eiichi
E
Department of Physics, Syracuse University, Syracuse, New York 13244, USA. eiich.hirose@gmail.com
Kawabe
Keita
K
Sigg
Daniel
D
Adhikari
Rana
R
Saulson
Peter R
PR