高行程低阶轴对称像差磁液体变形镜
A magnetic liquid deformable mirror for high stroke and low order axially symmetrical aberrations
摘要：
提出了一种由磁性液体（铁磁流体）制成的新型磁成形变形液体镜。可变形液体反射镜提供相对于可变形固体反射镜的优点：大变形、低成本和具有附加像差控制的非常大的反射镜的可能性。它们有一些缺点（例如响应时间较慢）。我们制作并测试了一个可变形反射镜，通过向5个由铜线绕在铝圆柱上制成的同心线圈施加电流来产生轴对称的波前像差。这些线圈中的每一个都产生一个磁场，该磁场结合起来使铁磁流体的表面变形为所需的形状。我们已经对直径为5 cm的原型镜进行了实验室测试，并证明了散焦以及振幅高达20微米的赛德尔和泽尼克球面像差，这是我们设备的可测量振幅的极限
英文摘要：
We present a new class of magnetically shaped deformable liquid mirrors made of a magnetic liquid (ferrofluid). Deformable liquid mirrors offer advantages with respect to deformable solid mirrors: large deformations, low costs and the possibility of very large mirrors with added aberration control. They have some disadvantages (e.g. slower response time). We made and tested a deformable mirror, producing axially symmetrical wavefront aberrations by applying electric currents to 5 concentric coils made of copper wire wound on aluminum cylinders. Each of these coils generates a magnetic field which combines to deform the surface of a ferrofluid to the desired shape. We have carried out laboratory tests on a 5 cm diameter prototype mirror and demonstrated defocus as well as Seidel and Zernike spherical aberrations having amplitudes up to 20 microns, which was the limiting measurable amplitude of our equipment
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