Control Algorithms of Liquid Crystal Phased Arrays Used as Adaptive Optic Correctors

摘要

Multi-segment liquid crystal phased arrays have been demonstrated as adaptive optics elements for correction of atmospheric turbulence. High speed dual-frequency nematic liquid crystal has sufficient bandwidth to keep up with moderate atmospheric Greenwood frequencies. However the segmented piston correction only spatial nature of the devices requires novel approaches to control algorithms especially when used with Shack-Hartmann wave front sensors. In this presentation we explore approaches and their effects on closed loop Strehl ratios. A Zemike modal based approach has produced the best results. The presentation will contain results from experiments with a Meadowlark optics liquid crystal device.