Method of recording and erasing information in an erasible optic

Details Method of recording and erasing information in an erasible optic Method of recording and erasing information in an erasible optic

1990-08-24

1993-07-27

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Erasable imaging

369 54, 369116, 369288, 430495, G11B 502

Patent

active

052309738

ABSTRACT:
An optical information recording medium is disclosed in which the recording layer is a material capable of absorbing energy and being reversibly converted between a substantially non-crystalline or amorphous state and a substantially crystalline state. The recording layer is a Te-Ge-Sb composition which also contains nitrogen. The optical recording medium includes a substrate onto which is sequentially deposited a first dielectric layer, a nitrogen-containing recording layer, a second dielectric layer and a metallic reflecting layer. In order to control the sensitivity of the medium to laser irradiation, the second dielectric layer is graded in thickness and progressively becomes thicker as a function of increasing radius. Alternatively, in another embodiment, the reflecting layer is graded in thickness, and progressively becomes thinner as a function of increasing radius. To further optimize the write/erase characteristics, the write to erase power ratio, as well as the recording duty cycle of the laser are varied as a function of radial position.

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