29 August 2006 Control algorithms of liquid crystal phased arrays used as adaptive optic correctors
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Abstract
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 Zernike modal based approach has produced the best results. The presentation will contain results from experiments with a Meadowlark optics liquid crystal device.
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David Dayton, David Dayton, John Gonglewski, John Gonglewski, Stephen Browne, Stephen Browne, } "Control algorithms of liquid crystal phased arrays used as adaptive optic correctors", Proc. SPIE 6306, Advanced Wavefront Control: Methods, Devices, and Applications IV, 630604 (29 August 2006); doi: 10.1117/12.681655; https://doi.org/10.1117/12.681655
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