This paper introduces a low-cost adjustable-focus ferrogel mirror developed by incorporating magnetic nanoparticles into the micellar structure of poly[styrene-b-(ethylene-co-butylene)-b-styrene] triblock copolymer and a block-selective solvent. This ferrogel remains homogeneous on exposure to different external magnetic fields. A homebuilt Shack-Hartmann wavefront sensor (SHS) was used to measure and reconstruct the wavefronts and to find the profiles of the deformed ferrogel mirrors under the influence of a magnetic field. The effects of main parameters such as ferrogel composition, magnetic nanoparticles concentration, and magnetic field intensity on the mirror performance were investigated. Ferrogel with a lower solvent loading has a higher Young’s modulus and demonstrates a milder curvature in a given magnetic field. Higher concentration of nanoparticles results in smaller focal lengths of the ferrogel mirror. This deformable mirror has a good optical surface finish and has the potential to be used in adjustable optical systems.

本文介绍了一种低成本的可调焦铁凝胶镜，该镜是通过将磁性纳米粒子掺入到聚[苯乙烯-b-（乙烯-丁烯基）-b-苯乙烯]三嵌段共聚物和嵌段选择性溶剂的胶束结构中而开发的。这种铁凝胶在暴露于不同的外部磁场时保持均质。使用自制的Shack-Hartmann波前传感器（SHS）来测量和重建波前，并在磁场的影响下找到变形的铁凝胶镜的轮廓。研究了诸如铁凝胶组成，磁性纳米粒子浓度和磁场强度等主要参数对反射镜性能的影响。溶剂含量较低的铁凝胶具有较高的杨氏模量，并在给定的磁场中显示出较小的曲率。纳米粒子的浓度越高，铁凝胶镜的焦距就越小。这种可变形镜具有良好的光学表面光洁度，并有可能在可调光学系统中使用。