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One-laser-two-beam Method for Twice as High Write Speed in Rewritable Phase Change Optical Disks

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Abstract

This paper proposes the method which enables us to overwrite phase change marks with twice as high speed as in the conventional method. The laser beam emitted from a laser diode is divided into two beams by a grating, which will be incident onto the same track of a disk through the same objective lens. One of the beams makes the preceding spot for erasing, and another the following spot for more erasing and writing. This method enables us to achieve a high write speed with sufficient readout durability which will be a severe problem in high speed recording of rewritable media. Feasibility of this method is shown.

© 2003 Optical Society of America

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