In optical-disk technology, a laser beam alters the surface of a plastic or metallic disk to represent data.
在光盘技术中，激光束改变塑料或金属盘的表面来代表数据。
2
In optical recording, a microscopic depression made on the disk surface by the recording laser beam. Recorded information is contained in the pits and the Spaces between pits-lands.
在光记录技术中，由记录激光束在光盘表面上烧蚀的一个微小凹陷区。记录信息包含在凹区和凸区中。
3
Validity of scalar diffraction theory must be checked, because the size of information mark (pit) of opticaldisk is comparable with or smaller than the laser wavelength.