Low Noise, Phase-Change Optical Recording Media
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Feb-02
Crystals which fall into the cubic class are optically isotropic. Therefore, when a phase-change optical recording medium is chosen from materials which crystallize into cubic structures, there is no detectable noise due to grains, independent of the grain size. On disks made using materials which form cubic crystals, we were unable to detect any additional noise upon crystallization of a track. In contrast, on Te-alloy disks, which crystallize predominantly into anisotropic Te crystals, the disk noise increased by 5dB after crystallizing.