Advanced LIGO

  title={Advanced LIGO},
  author={The Ligo Scientific Collaboration},
The Advanced LIGO gravitational wave detectors are second generation instruments designed and built for the two LIGO observatories in Hanford, WA and Livingston, LA. The two instruments are identical in design, and are specialized versions of a Michelson interferometer with 4 km long arms. As in initial LIGO, Fabry-Perot cavities are used in the arms to increase the interaction time with a gravitational wave, and power recycling is used to increase the effective laser power. Signal recycling… 

Sensitivity and performance of the Advanced LIGO detectors in the third observing run

On April 1st, 2019, the Advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO), joined by the Advanced Virgo detector, began the third observing run, a year-long dedicated search for

Point absorbers in Advanced LIGO.

This analysis predicts that the power-dependent reduction in interferometer performance will significantly degrade maximum stored power by up to 50% and, hence, limit GW sensitivity, but it suggests system wide corrections that can be implemented in current and future GW detectors.

Suppressing parametric instabilities in LIGO using low-noise acoustic mode dampers

Interferometric gravitational-wave detectors like LIGO need to be able to measure changes in their arm lengths of order $10^{-18}~$m or smaller. This requires very high laser power in order to raise

Point Absorber Limits to Future Gravitational-Wave Detectors.

A general approach to the point absorber effect from first principles is presented and the achievable circulating power in current and future gravitational-wave detectors is calculated statistically given different point absorbers configurations.

Lightsaber: A Simulator of the Angular Sensing and Control System in LIGO

Lightsaber, a new time-domain simulator of the ASC in LIGO, a nonlinear simulation of the optomechanical system consisting of the high-power cavity laser beam and the last two stages of suspension in LigO including the ASC is presented.

Angular instability in high optical power suspended cavities.

It is shown that this phenomenon is likely to significantly affect the proposed gravitational wave detectors that require very high optical power, and the power dependent evolution of both the cavity soft and hard mode is observed.

Gravitational wave spectrometry with a Hong–Ou–Mandel interferometer in space

The possibility to use a Hong–Ou–Mandel (HOM) interferometer to carry out gravitational waves detection and spectrometry is investigated. The noise budget of the instrument is evaluated. The basic

Cryogenic suspension design for a kilometer-scale gravitational-wave detector

We report the mirror suspension design for large-scale cryogenic gravitational wave telescope, KAGRA, during bKAGRA phase 1. Mirror thermal noise is one of the fundamental noises for room-temperature

Gas cooling of test masses for future gravitational-wave observatories

Recent observations made with advanced LIGO and advanced Virgo have initiated the era of gravitational-wave astronomy. The number of events detected by these ‘2nd generation’ (2G) ground-based

Searching for spin-2 ULDM with gravitational waves interferometers

The detection of gravitational waves from merging binaries has ushered in the era of gravitational wave interferometer astronomy. Besides these strong, transient, calamitous events, much weaker