13 March 2013 Near-diffraction-limited tunable liquid crystal lens with simplified design
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Optical Engineering, 52(3), 035007 (2013). doi:10.1117/1.OE.52.3.035007
Abstract
A high-efficiency tunable refractive lens based on liquid crystals with concentric electrode rings and a simple unique design of a resistor network is reported, and used to assess the performance of an optimized electrically tunable lens. It has a large number of phase control points to be able to accurately control the phase profile and produce high efficiency. The lens design uses resistors between neighboring electrodes to minimize external connections. The lens optical path difference is measured as a near perfect parabolic shape and the Strehl ratio of about 80% is obtained (comparing to a high-quality glass lens). Image evaluations show a good image quality with diffraction limited resolution, but the contrast is lowered by a large-area haze. The lens design also shows a good switching speed, and adjustable power, allowing it to be used in many applications. An example lens with a diameter of 2.4 mm and a 5 diopter tunable range is used in the evaluations.
© The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
Liwei Li, Doug Bryant, Tony Van Heugten, Dwight Duston, Philip J. Bos, "Near-diffraction-limited tunable liquid crystal lens with simplified design," Optical Engineering 52(3), 035007 (13 March 2013). http://dx.doi.org/10.1117/1.OE.52.3.035007
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KEYWORDS
Liquid crystals

Glasses

Electrodes

Lens design

Phase measurement

Modulation transfer functions

Resistors

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