High dynamic range thermally actuated bimorph mirror for gravitational wave detectors
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 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. Received 29 October 2019; revised 30 January 2020; accepted 3 February 2020; posted 6 February 2020 (Doc. ID 376764); published 18 March 2020. This research was conducted jointly with the support of the Australian Research Council Centre of Excellence for Gravitational Wave Discovery and the National Science Foundation under the LIGO cooperative agreement. Funding: Australian Research Council (CE170100004); National Science Foundation (PHY-0757058). The authors declare no conflicts of interest.