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Proceedings Paper

Design of liquid crystal lens for the compensation of spherical aberration in the Blu-ray optical pickup
Author(s): Suk-Ho Chung; Young-Joo Kim; In-Cheol Chang; Ho-Seop Jeong
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Paper Abstract

There are many proposals and studies for the high density optical data storages with a data capacity over 150GB. Multi-layer recording is consider as one of the best candidates for the next generation optical data storage since it can be realized with an addition of a few optical components in the current Blu-ray (BD) optical pickup. Of course, it is required to compensate the spherical aberration between the recording layers in the multi-layer disk. A novel liquid crystal (LC) lens is proposed and designed to compensate the spherical aberration occurred by the difference of substrate thickness. New structure of liquid crystal (LC) lens includes both concave and convex surfaces which can compensate the spherical aberration with a relatively long range. Since previously developed LC panel showed very low tolerance to the shift of objective lens, new design was proposed with a special LC lens structure to improve both characteristics of the shift tolerance and compensation range. The refractive index of LC lens is changed by applying a voltage on the ITO electrodes prepared with a curvature surface. Therefore, a focal point of the transmitted light can be changed with a careful control of applied voltage, resulting in a compensation of the spherical aberration. Several types of LC lens, including spherical and aspherical surfaces, were designed and their performance was simulated theoretically. With an optimized curvature control with the spherical LC lens, the aberration of BD optical pickup can be kept under 0.018λRMS even for the thickness variation of ±25μm.

Paper Details

Date Published: 15 September 2005
PDF: 5 pages
Proc. SPIE 5966, Seventh International Symposium on Optical Storage (ISOS 2005), 59661T (15 September 2005); doi: 10.1117/12.649805
Show Author Affiliations
Suk-Ho Chung, Yonsei Univ. (South Korea)
Young-Joo Kim, Yonsei Univ. (South Korea)
In-Cheol Chang, Samsung Electro Mechanics Co., Ltd. (South Korea)
Ho-Seop Jeong, Samsung Electro Mechanics Co., Ltd. (South Korea)

Published in SPIE Proceedings Vol. 5966:
Seventh International Symposium on Optical Storage (ISOS 2005)
Fuxi Gan; Lisong Hou, Editor(s)

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