Modeling and control of magnetic fluid deformable mirror with dual-layer actuators

Abstract

In this paper, a rectangular magnetic fluid deformable mirror (MFDM) with dual-layer actuators is proposed, which is designed to improve the correction performance for full-order aberrations. The shape of the magnetic fluid surface is controlled by the combined magnetic field generated by a Maxwell coil and a two-layer array of miniature copper coils. Compared to conventional adaptive systems that use two mirrors, the proposed MFDM combines the two mirrors into one device. In order to evaluate the performance of MFDM on the correction of full-order aberrations, a decoupling control algorithm based on Zernike mode decomposition is adopted for the MFDM with dual-layer actuators. The experimental results based on a fabricated prototype MFDM show the effective correction performance of the mirror for the full-order aberrations.