High dynamic range thermally actuated bimorph mirror for gravitational wave detectors
H. Cao(Australian Research Council), A. F. Brooks(California Institute of Technology), S. Ng(Australian Research Council), D. J. Ottaway(Australian Research Council), A. Perreca(University of Trento), J. W. Richardson(California Institute of Technology), Aria Chaderjian(California Institute of Technology), P. J. Veitch(Australian Research Council)
Cited by 19
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}} + $A+ upgrade of the Laser Interferometer Gravitational-wave Observatory (LIGO). Its deformation and operation limits were measured and verified against finite element simulation.
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