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Multi-layered transmissive disc: an alternative to holography

September 2002
Journal of Magnetism and Magnetic Materials 249(3):431-436

DOI:10.1016/S0304-8853(02)00465-1

Authors:

Joseph Colineau

Thales Group

Volume recording is the key to increase optical storage density. Disc transparency requires the pits of each layer to generate very small phase shift to the transmitted beam. Readout of very shallow phase shift has been proven possible, and new tracking methods have been designed. We showed that focused recording can work up to a few hundred layers with good power efficiency and realistic optical design; this should pave the way up to multi-terabyte optical disc.

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