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
(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
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)