Demonstration of magnetic and light-controlled actuation of a photomagnetically actuated deformable mirror for wavefront control

Amit Kumar Jha; Ewan S. Douglas; Meng LiCorey FucetolaFiorenzo G. Omenetto

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Demonstration of magnetic and light-controlled actuation of a photomagnetically actuated deformable mirror for wavefront control

机译：Demonstration of magnetic and light-controlled actuation of a photomagnetically actuated deformable mirror for wavefront control

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Deformable mirrors (DMs) have wide applications ranging from astronomical imaging to laser communications and vision science. However, they often require bulky multichannel cables for delivering high power to their drive actuators. A low-powered DM, which is driven in a contactless fashion, could provide a possible alternative to this problem. We present a photomagnetically actuated deformable mirror (PMADM) concept, which is actuated in a contactless fashion by a permanent magnet and low-power laser heating source. We present the laboratory demonstration of prototype optical surface quality, magnetic control of focus, and COMSOL simulations of its precise photocontrol. The PMADM prototype is made of a magnetic composite (polydimethylsiloxane + ferromagnetic CrO_2) and an optical-quality substrate layer and is 30.48 mm × 30.48 mm × 175 μm in dimension with an optical pupil diameter of 8 mm. It deforms to 5.76 μm when subjected to a 0.12-T magnetic flux density and relaxes to 3.76 μm when illuminated by a 50-mW laser. A maximum stroke of 8.78 μm before failure is also estimated considering a 3× safety factor. Our work also includes simulation of astigmatism generation with the PMADM, a first step in demonstrating control of higher order modes. A fully developed PMADM may have potential application for wavefront corrections in vacuum and space environments.

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《Optical Engineering》 |2021年第12期|124102-1-124102-19|共19页
作者
Amit Kumar Jha; Ewan S. Douglas; Meng LiCorey FucetolaFiorenzo G. Omenetto;
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作者单位

University of Arizona, Wyant College of Optical Sciences, Tucson, Arizona, United States;

University of Arizona, Department of Astronomy and Steward Observatory, University of Arizona Space Astrophysics Lab, Tucson, Arizona, United States;

Tufts University, Silk Lab, Department of Biomedical Engineering, Medford, Massachusetts, United States;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类计量学;
关键词
active optics; deformable mirror; photomagnetic actuation; magnetic composites; wavefront control; polydimethylsiloxane; actuators;

Demonstration of magnetic and light-controlled actuation of a photomagnetically actuated deformable mirror for wavefront control

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