| 摘要 |
The present invention relates to a method and a system for the storage of data in the form of volume holograms which do not mutually overlap. The storage medium consists of a light-sensitive materail in the form of a plate of thickness D, in which a single hologram is essentially shaped as a cylinder with the minimal possible cross-section. The signal light beam is modulated with data and directed onto the plate-shaped storage material by means of a lens or a convenient optical system, illuminating an area of said material which, for a given amount of data, is the smallest possible. To record a hologram, a reference light beam is used, incident upon the storage material either from the same direction as the signal beam, or opposite thereto. In contradistinction to prior-art solutions, the inventive reference light beam used for recording illuminates, in the most favorable case, the smallest possible volume of the storage material. The holgoram is only written in the portion where the signal and the reference beams overlap, so its volume is equal to the volume illuminated by the reference beam. |
