Abstract
Large-capacity optical video recorder for recording high-definition television (HD-TV) content is under development. We realized a rewritable optical disk and an write-once disk using a high numerical aperture (NA) objective lens and a blue-violet laser-diode. The active layer of the rewritable disk is made of Ge-In-Sb-Te materials. And write-once disk's recording layer was Bi-Ge alloy which was more environmentally friendly than that of the rewritable disk. At both disk, jitter values of less than 6.5% were obtained at 25 GB capacity.
