Microscale Adaptive Optics: Wave-Front Control with a mu-Mirror Array and a VLSI Stochastic Gradient Descent Controller

The performance of adaptive systems that consist of microscale on-chip elements [microelectromechanical mirror (mu-mirror) arrays and a VLSI stochastic gradient descent microelectronic control system] is analyzed. The mu-mirror arrays with 5 x 5 and 6 x 6 actuators were driven with a control system...

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Veröffentlicht in:	Applied Optics 2001-08, Vol.40 (24), p.4243-4253
Hauptverfasser:	Weyrauch, T, Vorontsov, M A, Bifano, T G, Hammer, J A, Cohen, M, Cauwenberghs, G
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Sprache:	eng
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container_title	Applied Optics
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creator	Weyrauch, T Vorontsov, M A Bifano, T G Hammer, J A Cohen, M Cauwenberghs, G
description	The performance of adaptive systems that consist of microscale on-chip elements [microelectromechanical mirror (mu-mirror) arrays and a VLSI stochastic gradient descent microelectronic control system] is analyzed. The mu-mirror arrays with 5 x 5 and 6 x 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.
doi_str_mv	10.1364/AO.40.004243
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title	Microscale Adaptive Optics: Wave-Front Control with a mu-Mirror Array and a VLSI Stochastic Gradient Descent Controller
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