MIN Ling-kun,WU Zhi-zheng,HUANG Ming-shuang,KONG Xiang-hui.A large stroke magnetic fluid deformable mirror for focus control[J].Optoelectronics Letters,2016,12(2):115-118 A large stroke magnetic fluid deformable mirror for focus control Author Name Affiliation MIN Ling-kun  Department of Precision Mechanical Engineering, Shanghai University, Shanghai 200072, China  WU Zhi-zheng  Department of Precision Mechanical Engineering, Shanghai University, Shanghai 200072, China  HUANG Ming-shuang  Department of Precision Mechanical Engineering, Shanghai University, Shanghai 200072, China  KONG Xiang-hui  Department of Precision Mechanical Engineering, Shanghai University, Shanghai 200072, China  Abstract:       A liquid deformable mirror, which can provide a large stroke deflection more than 100 ?m, is proposed for focus control. The deformable mirror utilizes the concept of magnetic fluid deformation shaped with electromagnetic fields to achieve concave or convex surface and to change the optical focus depth of the mirrors. The free surface of the magnetic fluid is coated with a thin layer of metal-liquid-like film (MELLF) prepared from densely packed silver nanoparticles to enhance the reflectance of the deformable mirror. The experimental results on the fabricated prototype magnetic fluid deformable mirror (MFDM) show that the desired concave/convex surface shape can be controlled precisely with a closed-loop adaptive optical system. Hits: 4132 Download times: 0 View Full Text    Download reader