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Effective spherical aberration compensation by use of a nematic liquid-crystal device

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Abstract

The next generation of optical data storage system beyond DVDs will use blue laser light and an objective lens with a high numerical aperture of 0.85 to increase storage capacity. Such high numerical aperture systems have an inherent higher sensitivity to aberrations. In particular, the spherical aberration caused by cover layer thickness tolerances and—more obvious—by dual-layer disks with a typical separation of approximately 20 μm between the two layers must be compensated. We propose a novel transmissive nematic liquid-crystal device, which is capable of compensating spherical aberration that occurs during the operation of optical pickup systems.

© 2004 Optical Society of America

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