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Gravitational waves from binary black hole and neutron star mergers are beingregularly detected. As of 2021, ninety confident gravitational wave detectionshave been made by the LIGO and Virgo detectors. Work is ongoing to furtherincrease the sensitivity of the detectors for the fourth observing run,including installing some of the A+ upgrades designed to lower the fundamentalnoise that limits the sensitivity to gravitational waves. In this review, wewill overview how the LIGO detectors work, including their opticalconfiguration and lock acquisition procedure, discuss the detectors'fundamental and technical noise limits and compare to the current measuredsensitivity, and review the A+ upgrades currently being installed in thedetectors.

Review of the Advanced LIGO gravitational wave observatories leading to observing run four