Magnetic fluid deformable mirror (MFDM) is a new type of wavefront corrector that features large deformation strokes, smooth continuous mirror surface, low manufacturing cost, and easy scalability. Considering the idea of taking full advantages of the MFDM’s stroke strengths and the limitations of the adaptive optics (AO) system with the wavefront sensor, this paper proposes a MFDM based wavefront sensorless adaptive optics system. In order to make the MFDM produce desired deformation to eliminate unknown aberrations, this paper introduces the stochastic parallel gradient descent (SPGD) algorithm in the control system. Experimental results show that this SPGD algorithm can effectively control the MFDM to compensate for the unknown aberration in a parallel laser beam so that a perfect focused spot is produced on the CCD image.
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.
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