Deformable mirrors (DMs) have wide applications ranging from astronomical imaging to laser communications and vision science. However, they often require bulky multi-channel 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 CrO2) 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.

中文翻译：

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用于波前控制的光磁驱动可变形反射镜的磁控和光控驱动演示

可变形反射镜 (DM) 具有广泛的应用，从天文成像到激光通信和视觉科学。然而，它们通常需要笨重的多通道电缆来为其驱动执行器提供高功率。以非接触方式驱动的低功率 DM 可以为这个问题提供一个可能的替代方案。我们提出了一种光磁驱动变形镜 (PMADM) 概念，它由永磁体和低功率激光加热源以非接触方式驱动。我们展示了原型光学表面质量的实验室演示、焦点的磁控制以及其精确光控制的 COMSOL 模拟。PMADM 原型由磁性复合材料（聚二甲基硅氧烷 + 铁磁性 CrO2）和光学质量基底层制成，尺寸为 30.48 mm × 30。尺寸为 48 mm × 175 μm，光瞳直径为 8 mm。当受到 0.12-T 磁通密度的影响时，它会变形到 5.76 μm，当被 50-mW 激光照射时会松弛到 3.76 μm。考虑到 3 倍的安全系数，估计故障前的最大行程为 8.78 μm。我们的工作还包括使用 PMADM 模拟像散生成，这是演示高阶模式控制的第一步。完全开发的 PMADM 可能具有用于真空和空间环境中波前校正的潜在应用。我们的工作还包括使用 PMADM 模拟像散生成，这是演示高阶模式控制的第一步。完全开发的 PMADM 可能具有用于真空和空间环境中波前校正的潜在应用。我们的工作还包括使用 PMADM 模拟像散生成，这是演示高阶模式控制的第一步。完全开发的 PMADM 可能具有用于真空和空间环境中波前校正的潜在应用。