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Applied Optics

Applied Optics


  • Vol. 40, Iss. 24 — Aug. 20, 2001
  • pp: 4243–4253

Microscale adaptive optics: wave-front control with a µ-mirror array and a VLSI stochastic gradient descent controller

Thomas Weyrauch, Mikhail A. Vorontsov, Thomas G. Bifano, Jay A. Hammer, Marc Cohen, and Gert Cauwenberghs  »View Author Affiliations

Applied Optics, Vol. 40, Issue 24, pp. 4243-4253 (2001)

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The performance of adaptive systems that consist of microscale on-chip elements [microelectromechanical mirror (µ-mirror) arrays and a VLSI stochastic gradient descent microelectronic control system] is analyzed. The µ-mirror arrays with 5 × 5 and 6 × 6 actuators were driven with a control system composed of two mixed-mode VLSI chips implementing model-free beam-quality metric optimization by the stochastic parallel perturbative gradient descent technique. The adaptation rate achieved was near 6000 iterations/s. A secondary (learning) feedback loop was used to control system parameters during the adaptation process, further increasing the adaptation rate.

© 2001 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(230.3990) Optical devices : Micro-optical devices

Original Manuscript: October 6, 2000
Revised Manuscript: April 28, 2001
Published: August 20, 2001

Thomas Weyrauch, Mikhail A. Vorontsov, Thomas G. Bifano, Jay A. Hammer, Marc Cohen, and Gert Cauwenberghs, "Microscale adaptive optics: wave-front control with a µ-mirror array and a VLSI stochastic gradient descent controller," Appl. Opt. 40, 4243-4253 (2001)

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