Overview of Advanced LIGO Adaptive Optics

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${}_2$ 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.

References in corpus (2)

• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• Observation of Parametric Instability in Advanced LIGO

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• An optical lock-in camera for advanced gravitational wave interferometers
• Expanding the Quantum-Limited Gravitational-Wave Detection Horizon
• Thermal Deformation Reduction in High-Power Interferometry with Higher-Order Laser Modes
• Demonstration of a next-generation wavefront actuator for gravitational-wave detection