title: Microscale Adaptive Optics: Wave-Front Control with a mu-Mirror Array and a VLSI Stochastic Gradient Descent Controller.
abstract: 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.
authors: T
authors: T
authors: Weyrauch
authors: M A
authors: MA
authors: Vorontsov
authors: T G
authors: TG
authors: Bifano
authors: J A
authors: JA
authors: Hammer
authors: M
authors: M
authors: Cohen
authors: G
authors: G
authors: Cauwenberghs