Adaptive wavefront correction using a VLSI implementation of the parallel gradient descent algorithm

被引：6

作者：

Carhart, GW ^{[1
]}

Vorontsov, MA ^{[1
]}

Cohen, M ^{[1
]}

Cauwenberghs, G ^{[1
]}

Edwards, RT ^{[1
]}

机构：

[1] USA, Res Lab, Adelphi, MD 20783 USA

来源：

HIGH-RESOLUTION WAVEFRONT CONTROL: METHODS, DEVICES, AND APPLICATIONS | 1999年 / 3760卷

关键词：

adaptive optics; adaptive focusing; model-free optimization; parallel gradient descent; analog control circuitry;

D O I：

10.1117/12.367576

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

An adaptive laser beam focusing system using a 127 channel liquid crystal phase modulator is presented. The controller for the system is a circuit built with prototype VLSI chips that implement the stochastic parallel gradient descent algorithm. The controller is driven by a scalar laser beam quality metric and can run at the rate of 150 kHz. The system performance is characterized and a secondary control loop manipulating one of the algorithm parameters is experimentally investigated. The performance of the system is reported and performance improvements obtained by using the recent history of the beam quality metric to control an algorithm parameter is demonstrated.

引用

页码：61 / 66

页数：6

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