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。

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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。

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Validity of scalar diffraction theory must be checked, because the size of information mark (pit) of optical disk is comparable with or smaller than the laser wavelength.

由于光盘信息符(坑点)尺寸可以和波长相比较或更小，标量衍射理论的有效性必需进行检验。

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