In:
Applied Optics, Optica Publishing Group, Vol. 60, No. 13 ( 2021-05-01), p. 4047-
Abstract:
Small, highly absorbing points are randomly present on the surfaces of
the main interferometer optics in Advanced LIGO. The resulting nanometer scale thermo-elastic deformations and substrate lenses from
these micron-scale absorbers significantly reduce the sensitivity of the interferometer directly though a reduction in the power-recycling
gain and indirect interactions with the feedback control system. We review the expected surface deformation from point absorbers and
provide a pedagogical description of the impact on power buildup in
second generation gravitational wave detectors (dual-recycled Fabry–Perot Michelson interferometers). This analysis predicts that
the power-dependent reduction in interferometer performance will significantly degrade maximum stored power by up to 50% and, hence,
limit GW sensitivity, but it suggests system wide corrections that can be implemented in current and future GW detectors. This is
particularly pressing given that future GW detectors call for an order of magnitude more stored power than currently used in Advanced LIGO in
Observing Run 3. We briefly review strategies to mitigate the effects of point absorbers in current and future GW wave detectors to maximize
the success of these enterprises.
Type of Medium:
Online Resource
ISSN:
1559-128X
,
2155-3165
Language:
English
Publisher:
Optica Publishing Group
Publication Date:
2021
detail.hit.zdb_id:
207387-0
Permalink
