articleClassical and Quantum GravityMar 3, 2015GREEN OA

Advanced LIGO

California Institute of Technology · Louisiana State University · +85 more institutions

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Abstract

The Advanced LIGO gravitational wave detectors are second-generation instruments designed and built for the two LIGO observatories in Hanford, WA and Livingston, LA, USA. 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 has been added in Advanced LIGO to improve the frequency response. In the most sensitive frequency region around 100 Hz, the design strain sensitivity is a factor of 10 better than Initial LIGO. In addition,…

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Topics & keywords

Keywords
  • LIGO
  • Physics
  • Interferometry
  • Gravitational wave
  • Sensitivity (control systems)
  • Michelson interferometer
  • Optics
  • Gravitational-wave observatory
UN Sustainable Development Goals
  • Affordable and clean energy
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