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

Eiichi Hirose, Keita Kawabe, Daniel Sigg, Rana Adhikari, Peter R. Saulson

Research output: Contribution to journalArticle

23 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)3474-3484
Number of pages11
JournalApplied Optics
Issue number18
StatePublished - Jun 20 2010


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

Cite this