Micro-scale Adaptive optics: Wavefront Control with μ-mirror Array and VLSI Stochastic Gradient Descent Controller

Document Type

Article

Publication Date

8-20-2001

Publication Source

Applied Optics

Abstract

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.

Inclusive pages

4243-4253

ISBN/ISSN

1559-128X

Comments

One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

Permission documentation on file.

Publisher

Optical Society of America

Volume

40

Issue

24

Peer Reviewed

yes


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