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High dynamic range thermally actuated bimorph mirror for gravitational wave detectors

Huy Tuong Cao, Aidan Brooks, Sebastian W. S. Ng, David Ottaway, Antonio Perreca, Jonathan W. Richardson, Aria Chaderjian, and Peter J. Veitch

Abstract

Adaptive optics are crucial for overcoming the fabrication limits on mirror curvature in high-precision interferometry. We describe a low-cost thermally actuated bimorph mirror with 200 mD linear response, which meets dynamic range and low aberration requirements for the ${\rm{A}} + $ upgrade of the Laser Interferometer Gravitational-wave Observatory (LIGO). Its deformation and operation limits were measured and verified against finite element simulation.

© 2020 Optical Society of America

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