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    • 7. 发明授权
    • Optical storage method and device for storing and reading digital
information
    • 用于存储和读取数字信息的光存储方法和装置
    • US5659536A
    • 1997-08-19
    • US463356
    • 1995-06-05
    • Christian MaillotJean-Pierre HuignardJean-Claude LehureauPaul-Louis MeunierClaude Puech
    • Christian MaillotJean-Pierre HuignardJean-Claude LehureauPaul-Louis MeunierClaude Puech
    • G11B7/00G11B7/004G11B7/0065
    • G11B7/0065
    • Disclosed is a system for the recording of data on optic disks. Presently used optic disks, which can be read with lasers working in wavelengths of the visible region (between 0.5 and 0.8 microns), have a maximum surface storage density of the order of one data bit per elementary zone having an area of about one square micrometer. Beyond this limit, the diffraction does not allow the neighboring zones to be distinguished. A means is proposed to considerably increase the storage capacities: in an elementary zone of a layer, an information bit is written not in the form of a point of absorption of a laser light but in the form of a diffraction grating with a determined pitch. Several diffraction gratings, having pitches different from one another, may be superimposed at the same position, enabling the recording, in one and the same zone, of several information bits. The diffraction gratings are made by a periodic local variation of the optic index of the layer. They are made by a high energy laser beam, out of a material with an index that may vary as a function of this energy. The reading is done by a frequency tunable laser that enables the detection, for different frequencies, of the presence or absence of diffraction gratings.
    • 公开了一种用于在光盘上记录数据的系统。 目前使用的可以在可见光波长范围(0.5至0.8微米)工作的激光器读取的光盘具有的面积约为1平方微米的每个基本区域的一个数据位的最大表面存储密度 。 除此之外,衍射不允许区分相邻区域。 提出了显着增加存储容量的手段:在层的基本区域中,信息位不以激光吸收点的形式写入,而是以具有确定的间距的衍射光栅的形式写入。 具有彼此不同的间距的几个衍射光栅可以叠加在相同位置,使得能够在同一个区域中记录几个信息位。 衍射光栅由层的光学索引的周期性局部变化制成。 它们由高能激光束制成,具有可能随该能量的函数而变化的指数的材料。 读数由可调频激光器完成,能够检测不同频率的衍射光栅的存在或不存在。