Deformable mirrors based on magnetic liquids
Deformable mirrors based on magnetic liquids
复制标题
基于磁性液体的可变形镜子
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
A. Ritcey
中科院分区：
文献类型：
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作者：
P. Laird;E. Borra;R. Bergamasco;J. Gingras;L. Truong;A. Ritcey
越来越大的望远镜和更先进的自适应光学系统（如多共轭自适应光学）的趋势推动了对具有大量低成本执行器的可变形镜的需求。其他应用需要比传统镜子更大的冲程。磁性可变形液体镜是解决这两个问题的潜在方法。在铁磁流体表面沉积一种称为金属液状膜（MELLF）的薄银胶体，解决了纯铁磁流体低反射率的问题。这种组合提供了可以在磁场中精确成形的液体光学表面。我们已经展示了一种反射涂层，它在近红外波段的反射率为50%，可以稳定使用30天以上。另外的实验表明，MELLF涂层可以提供超过80%的近红外反射率值。我们还报告了最近液体可变形镜的响应时间测量。我们已经演示了摆率为800 μm/s的液体镜驱动器，对应于10 μm和5 μm行程的驱动器带宽分别约为40 Hz和80 Hz。
The trend towards ever larger telescopes and more advanced adaptive optics systems such as multi-conjugate adaptive optics is driving the need for deformable mirrors with a large number of low cost actuators. Other applications require strokes larger than those readily available from conventional mirrors. Magnetically deformable liquid mirrors are a potential solution to both these problems. Depositing a thin silver colloid known as a metal liquid-like film (MELLF) on the ferrofluid surface solves the problem of low reflectivity of pure ferrofluids. This combination provides a liquid optical surface that can be precisely shaped in a magnetic field. We have demonstrated a reflective coating that is stable for more than 30 days with a reflectivity of 50% in the near infrared. Additional experiments indicate that MELLF coatings can provide near infrared reflectivity values in excess of 80%. We also report on recent response time measurements of liquid deformable mirrors. We have demonstrated liquid mirror actuators with slew rates of 800 μm/s, corresponding to an actuator bandwidth of approximately 40 Hz and 80 Hz for strokes of 10 μm and 5 μm respectively.