前言随着信息社会的发展,要求信息贮存材料容量高、存取速度快、成本低。目前磁记录在信息贮存技术中处于统治地位,但在很多方面受到其它贮存技术如光记录的挑战。光记录是采用激光使记录介质表面产生一些物理或化学变化,这些变化可以通过反射率或透射率的变化重读。记录比特的面积取决于聚焦激光束的衍射,因而光记录能进 Preface With the development of information society, information storage materials require high capacity, fast access and low cost. At present, magnetic recording is dominant in information storage technology, but in many ways it is challenged by other storage technologies such as optical recording. Optical recording uses a laser to create some physical or chemical change in the surface of the recording medium. These changes can be re-read by changes in reflectance or transmittance. The area of ​​the recording bit depends on the diffraction of the focused laser beam so that the optical recording can proceed