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Optica Study Demonstrates FROSTI, a Thermal Adaptive Optics System for LIGO

The lab-tested device reshapes mirror wavefronts with patterned heating to counter laser-induced distortions at over one megawatt.

Overview

  • The peer-reviewed paper reports a full-scale prototype that was successfully tested on a 40 kg LIGO mirror.
  • The system projects custom thermal radiation patterns to deliver fine, higher‑order wavefront corrections without adding excess noise.
  • The design targets effective intracavity laser powers above 1 megawatt, nearly five times LIGO’s current operating level.
  • Researchers present a path to deploy the approach in the LIGO A# upgrade and to scale it to 440 kg mirrors planned for Cosmic Explorer, with further integration and validation still required.
  • The NSF‑funded effort led by UC Riverside with collaborators at MIT and Caltech includes author claims that the capability could expand the observable volume by roughly a factor of ten.