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Proceedings Paper

Circular geometry liquid crystal adaptive lens with Fresnel lens phase profile
Author(s): Yi Sun; Stephen T. Kowel; Gregory P. Nordin
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Paper Abstract

The liquid crystal adaptive lens (LCAL) is an electro-optical device using a set of electrodes to grade the refractive index across its aperture. We report initial efforts at developing an LCAL using circular electrodes to provide a simpler architecture and faster response than previous devices based on linear electrodes. A Fresnel lens phase profile is applied to yield a lens with a useful F-number. Numerical simulation is developed to study the aberration of the LCAL and predict its performance with a circular electrode geometry. The LCAL is designed with a set of high density electrodes in the conductive ladder meshing configuration which results in a small number of externally controlled electrodes. A new feedback auto-focusing system based on LabVIEW software has been developed to optimize control output voltages using signals from a CID camera. The application of LCAL in microscope imaging systems for focus adjustment without lens motion is described. A prototype LCAL is being designed that has a 7.86 mm diameter aperture and a focal length adjustable from 0.38 m to infinity. It is fabricated on a glass substrate with two layers of transparent electrodes, insulating layers, and vias to connect the two conducting layers. The special fabrication challenges involved will be reviewed.

Paper Details

Date Published: 17 March 2000
PDF: 12 pages
Proc. SPIE 3955, Liquid Crystal Materials, Devices, and Flat Panel Displays, (17 March 2000); doi: 10.1117/12.379972
Show Author Affiliations
Yi Sun, Univ. of Alabama in Huntsville (United States)
Stephen T. Kowel, Univ. of Cincinnati (United States)
Gregory P. Nordin, Univ. of Alabama in Huntsville (United States)

Published in SPIE Proceedings Vol. 3955:
Liquid Crystal Materials, Devices, and Flat Panel Displays
Ranganathan Shashidhar; Bruce Gnade, Editor(s)

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