International Business Machines Corporation

Martin Y Chen

Kurt A Rubin

Grace Lim Gorman

Gary C Bjorklund

Victor B Jipson

Roger W Barton

Vincent Marrello

Charles Raymond Davis

An optical phase change media comprises a substrate, an active layer having a crystalline and a liquid state, a dielectric layer and a reflective layer. The active layer is of a thickness which will transmit incident light. The dielectric layer is of a thickness such that light passing through the active layer is reflected by the reflective layer and destructively interferes with the incident light reflected directly off of the active layer, thereby causing the crystalline state of the active layer to absorb more light than the liquid state. The result is that the media experiences reduced temperature during writing.

System and method for optical phase change recording

An optical storage system has an information containing film of a material which has a crystallization temperature between 100.degree. C. and 400.degree. C. and can be switched between the amorphous and the crystalline states. Both the amorphous and crystalline states are substantially a single phase where the stoichiometric ratio of the material remains unchanged. Spots on the film is heated with a circular laser beam with a controlled pulse duration and intensity to melt the material in the spots. The spots are quenched at one rate to produce the amorphous state, and in a second revolution of the disk, at a different rate to produce the crystalline state.

Process for optically storing information using materials having a

Reversible phase change storage material is thermally isolated in a storage medium by means of grooves in the substrate and at least one layer of a thermally conductive dielectric material.

Thermal design for reversible phase change optical storage media

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San Jose, CA, United States of America

Martin Y Chen