Japanese Journal of Applied Physics · 1998 · 36 citations · 4 references
Natural SciencesMaterials EngineeringMaterials ScienceOptical MaterialsOpticsThin FilmsOptical Properties Of SolidsOptical Thin FilmsThin Film Optical PropertiesThin Film Thermal PropertiesPhase Change Thermal BehaviorPhase-change Thermal EffectsPowersSignal Amplitude VariationThermal ConductivityThermal Effects In Photonic Devices
A recordable dual-layer optical disk that uses a Te–O–Pd phase-change film was studied for high-density recording. In order to reduce thermal influence to adjacent tracks, we selected the optimum composition of Te 42 O 46 Pd 12 that gives low thermal conductivity. To get equivalent signal amplitude and absorbance of layers, the thicknesses of the laser incident side recording layer (Layer 1) and the other layer (Layer 2) are designed to be 20 nm and 55 nm, respectively. We confirmed that there was less than 10% bottom jitter for both layers under the following recording densities: recording bit length of 0.41 µm and track pitch of 0.74 µm. The laser powers required for recording on Layer 1 and Layer 2 were typically 10 mW and 12 mW, respectively. The jitter was less than 13% for both layers with large power tolerance of 30%p-p.
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