一、光盘发展概况相对于利用磁通变化和磁化电流进行读写的磁盘,人们把用光学方式进行读写的圆盘叫做光盘。差不多二十多年以前,在发明激光之后不久,就开始了高密度光学数据存储的研究和发展工作。激光的一个主要特点,就是可聚焦成能量高度集中的极小的光点。在光学记录系统中,在微米大小的记录点上,通常可达到几兆瓦/cm~2的峰值强度。激光的这一特性,为超高密度的光学 First, the development of optical disk relative to the use of magnetic flux changes and magnetizing current to read and write the disk, people read and write optical disk called CD-ROM. Almost two decades ago, research and development of high-density optical data storage began shortly after the invention of the laser. One of the main features of a laser is its ability to focus on a very small spot of highly focused energy. In optical recording systems, peak strengths of a few megawatts / cm 2 are typically achievable at micrometer-sized recording points. This characteristic of lasers is very high-density optics