Thermal modelling of Advanced LIGO test masses

Haoyu Wang, Carl Blair, Miguel Dovale Álvarez, Aidan Brooks, Marie F. Kasprzack, Joshua Ramette, Patrick M. Meyers, Steffen Kaufer, Brian O'Reilly, Conor M. Mow-Lowry, Andreas Freise

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
180 Downloads (Pure)


High-reflectivity fused silica mirrors are at the epicentre of current advanced gravitational wave detectors. In these detectors, the mirrors interact with high power laser beams. As a result of finite absorption in the high reflectivity coatings the mirrors suffer from a variety of thermal effects that impact on the detectors performance. We propose a model of the Advanced LIGO mirrors that introduces an empirical term to account for the radiative heat transfer between the mirror and its surroundings. The mechanical mode frequency is used as a probe for the overall temperature of the mirror. The thermal transient after power build-up in the optical cavities is used to refine and test the model. The model provides a coating absorption estimate of 1.5 to 2.0 ppm and estimates that 0.3 to 1.3 ppm of the circulating light is scattered on to the ring heater.
Original languageEnglish
JournalClassical and Quantum Gravity
Issue number11
Publication statusPublished - 18 May 2017

Bibliographical note

14 pages, 9 figures


  • astro-ph.IM
  • physics.ins-det
  • interferometry
  • thermal modelling
  • coating absorption
  • scattering loss
  • mechanical mode
  • parametric instability
  • gravitational wave detection


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