摘要
随着时代的演进、信息的发展及多媒体的普及,记录媒体需具备更高的记录密度及容量才符合信息存储的需求。由于传统光盘的记录密度受限于读出光斑大小,即光学的衍射极限(diffraction limit)0.61λ/NA(λ:激光波长,NA:物镜的数值孔径(Numerical Aperture,NA))的限制,所以传统光盘技术要提高记录密度,一般可使用短波长激光或提高物镜的数值孔径使光斑大小缩小,例如CD(78 nm,NA:0.45)提升至DVD(650 nm,NA:0.6)到蓝光光盘(405 nm,NA:0.85),如图一所示。
Blue-ray disc and HD-DVD is the next generation high-density optical disc. This paper introduced general specification for blue-ray disc and parameters, specification for HD-DVD. Another two formats of blue-ray disc and some problems during developing of blue-ray disc are also demonstrated.
出处
《记录媒体技术》
2003年第4期22-25,共4页
China Mediatech
