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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 21 — Oct. 12, 2009
  • pp: 18957–18970

Closed-loop control of magnetic fluid deformable mirrors

Azhar Iqbal, Zhizheng Wu, and Foued Ben Amara  »View Author Affiliations

Optics Express, Vol. 17, Issue 21, pp. 18957-18970 (2009)

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This paper presents the first-ever experimental evaluation of a closed-loop adaptive optics system based on a magnetic fluid deformable mirror (MFDM). MFDMs are a new type of wavefront correctors used in adaptive optics systems to compensate for complex optical aberrations. They have been found particularly suitable for ophthalmic imaging systems where they can be used to compensate for the aberrations in the eye that lead to blurry retinal images. However, their practical implementation in clinical devices requires effective methods to control the shape of their deformable surface. This paper presents one such control method which is based on an innovative technique used to linearize the response of the MFDM surface shape. The design of the controller is based on a DC-decoupled model of the multi-input multi-output system and on considering a decentralized PI controller. Experimental results showing the performance of the closed-loop system comprising the developed controller and a 19-channel prototype MFDM are presented.

© 2009 OSA

OCIS Codes
(220.1000) Optical design and fabrication : Aberration compensation
(220.1080) Optical design and fabrication : Active or adaptive optics

ToC Category:
Adaptive Optics

Original Manuscript: August 6, 2009
Revised Manuscript: September 25, 2009
Manuscript Accepted: September 28, 2009
Published: September 6, 2009

Virtual Issues
Vol. 4, Iss. 12 Virtual Journal for Biomedical Optics

Azhar Iqbal, Zhizheng Wu, and Foued Ben Amara, "Closed-loop control of magnetic fluid deformable mirrors," Opt. Express 17, 18957-18970 (2009)

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