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A magnetic liquid deformable mirror for high stroke and low order axially symmetrical aberrations

2006; Optica Publishing Group; Volume: 14; Issue: 24 Linguagem: Inglês

10.1364/oe.14.011486

1094-4087

Denis Brousseau, E. F. Borra, Hubert Jean-Ruel, Jocelyn Parent, Anna M. Ritcey,

Advanced Surface Polishing Techniques

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 µm, which was the limiting measurable amplitude of our equipment.