Gerber R E, Mansuripur M
Appl Opt. 1995 Dec 10;34(35):8192-200. doi: 10.1364/AO.34.008192.
In optical-disk data-storage systems, the signal that provides tracking information is dependent on the groove shape, the optical constants of the materials involved, and the polarization state of the incident light. In this paper, we show that the tracking signal can be described by two measurable quantities, both of which are largely independent of aberrations in the optical system. Using these two quantities, we match the tracking performance of a given disk to an equivalent disk having rectangular grooves-the adjustable parameters being the rectangular groove depth and the duty cycle. By assumption, these rectangular grooves modulate only the phase of the incident beam and disregard its state of polarization. The effective groove depth and the duty cycle thus become dependent on the polarization state of the incident beam. We examine these dependences for various disks having different groove geometries and different combinations of materials.
在光盘数据存储系统中，提供跟踪信息的信号取决于沟槽形状、所涉及材料的光学常数以及入射光的偏振态。在本文中，我们表明跟踪信号可以由两个可测量的量来描述，这两个量在很大程度上都与光学系统中的像差无关。利用这两个量，我们将给定磁盘的跟踪性能与具有矩形沟槽的等效磁盘相匹配——可调参数为矩形沟槽深度和占空比。根据假设，这些矩形沟槽仅调制入射光束的相位而忽略其偏振态。因此，有效沟槽深度和占空比变得取决于入射光束的偏振态。我们研究了具有不同沟槽几何形状和不同材料组合的各种磁盘的这些相关性。
