LCD diffractive element design to handle multiple disk thicknesses

Mark O. Freeman; Hsi-Fu Shih; Yuan-Chin Lee; Jau-Jiu Ju

doi:10.1117/12.390514

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6 July 2000 LCD diffractive element design to handle multiple disk thicknesses

Mark O. Freeman, Hsi-Fu Shih, Yuan-Chin Lee, Jau-Jiu Ju

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Proceedings Volume 4081, Optical Storage and Optical Information Processing; (2000) https://doi.org/10.1117/12.390514
Event: Photonics Taiwan, 2000, Taipei, Taiwan

Abstract

We describe the design of a single diffractive LCD element placed adjacent to the objective lens that can be addressed to provide the required spherical aberration (SA) compensation for a plurality of disk substrate thicknesses. It is now commonplace that optical disk drives must be able to handle disks of more than one substrate thickness. The major problem is compensating for the SA introduced when the highly corrected objective lens is used with a disk substrate thickness other than that which it was specifically designed for. An abundance of methods for solving this problem in the specific case of CD/DVD backward compatibility exist in the literature; we use an active device to extend this to include HD-DVD as well.

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Mark O. Freeman, Hsi-Fu Shih, Yuan-Chin Lee, and Jau-Jiu Ju "LCD diffractive element design to handle multiple disk thicknesses", Proc. SPIE 4081, Optical Storage and Optical Information Processing, (6 July 2000); https://doi.org/10.1117/12.390514

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