MULTILEVEL OPTICAL RECORDING MEDIUM WITH TRANSPARENT HEAT SINK FOR LASER READ/WRITE SYSTEM

摘要

The invention concerns a multilevel recording medium for a laser beam read/write system, comprising at least a substrate (4a, 4b) and an assembly of layers forming a deep level (12) and at least a semi-transparent level (10), each of said levels having two stable states reversible under the effect of laser radiation. The invention is characterised in that the semi-transparent level comprises a layer (7) of phase-change material and at least a thermal absorption layer (21) located in front of the phase-change material layer, such that the laser beam passes through the thermal absorption layer before reaching the phase-change material.