Overview of Advanced LIGO Adaptive Optics
Aidan F. Brooks, Benjamin Abbott, Muzammil A. Arain, Giacomo Ciani,, Ayodele Cole, Greg Grabeel, Eric Gustafson, Chris Guido, Matthew Heintze,, Alastair Heptonstall, Mindy Jacobson, Won Kim, Eleanor King, Alexander Lynch,, Stephen O'Connor, David Ottaway, Ken Mailand
TL;DR
This paper reviews the thermal compensation system in Advanced LIGO, which uses adaptive optics components to correct thermally-induced optical distortions, ensuring optimal interferometer performance at high laser powers.
Contribution
It provides a comprehensive overview of the design, components, and performance of the TCS in Advanced LIGO, highlighting its effectiveness in minimizing optical distortions.
Findings
TCS corrects distortions with residual error of 5.4nm at 125W laser power
System components include ring heaters, CO2 laser projectors, and wavefront sensors
TCS effectively maintains optical quality during high-power operation
Abstract
This is an overview of the adaptive optics used in Advanced LIGO (aLIGO), known as the thermal compensation system (TCS). The thermal compensation system was designed to minimize thermally-induced spatial distortions in the interferometer optical modes and to provide some correction for static curvature errors in the core optics of aLIGO. The TCS is comprised of ring heater actuators, spatially tunable CO laser projectors and Hartmann wavefront sensors. The system meets the requirements of correcting for nominal distortion in Advanced LIGO to a maximum residual error of 5.4nm, weighted across the laser beam, for up to 125W of laser input power into the interferometer.
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