Reducing scattered light in LIGO's third observing run

The LIGO Scientific Collaboration, A. P. Lundgren, R. Macas, S. Mozzon, L. K. Nuttall

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Noise due to scattered light has been a frequent disturbance in the Advanced LIGO gravitational wave detectors, hindering the detection of gravitational waves. The non stationary scatter noise caused by low frequency motion can be recognized as arches in the time-frequency plane of the gravitational wave channel. In this paper, we characterize the scattering noise for LIGO's third observing run O3 from April, 2019 to March, 2020. We find at least two different populations of scattering noise and we investigate the multiple origins of one of them as well as its mitigation. We find that relative motion between two specific surfaces is strongly correlated with the presence of scattered light and we implement a technique to reduce this motion. We also present an algorithm using a witness channel to identify the times this noise can be present in the detector.
Original languageEnglish
Article number025016
Number of pages23
JournalClassical and Quantum Gravity
Issue number2
Publication statusPublished - 14 Dec 2020


  • astro-ph.IM
  • scattered light
  • LIGO
  • ground motion
  • interferometry


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