Closed-loop control of magnetic fluid deformable mirrors

Azhar Iqbal; Zhizheng Wu; Foued Ben Amara

doi:10.1117/12.839872

4 August 2009 Closed-loop control of magnetic fluid deformable mirrors

Azhar Iqbal, Zhizheng Wu, Foued Ben Amara

Proceedings Volume 7386, Photonics North 2009; 738628 (2009) https://doi.org/10.1117/12.839872
Event: Photonics North 2009, 2009, Quebec, Canada

Abstract

Adaptive optics (AO) systems make use of active optical elements, namely wavefront correctors (WFC), to improve the resolution of imaging systems by compensating for complex optical aberrations. Recently, magnetic fluid deformable mirrors (MFDM) were proposed as a promising new type of WFCs. These mirrors are developed by coating the free surface of a magnetic fluid with a thin reflective film of nano-particles. The reflective surface of the mirrors can be deformed using a locally applied magnetic field and thus serves as a WFC. MFDMs have been found particularly suitable for ophthalmic imaging systems where they can be used to compensate for the complex aberrations in the eye that blur the images of the internal parts of the eye. However, their practical implementation in clinical devices is hampered by the lack of effective methods to control the shape of their deformable surface. This paper presents a control algorithm that facilitated the first-ever use of a MFDM in a closed-loop AO system. The algorithm utilizes the influence function technique to decouple the multi-input multi-output system and features a proportional-integral controller structure. Experimental results showing the performance of the closed-loop system comprising the presented controller and a 19-channel prototype MFDM are presented.

Citation Download Citation

Azhar Iqbal, Zhizheng Wu, and Foued Ben Amara "Closed-loop control of magnetic fluid deformable mirrors", Proc. SPIE 7386, Photonics North 2009, 738628 (4 August 2009); https://doi.org/10.1117/12.839872

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