| 摘要 |
A master hologram is generated in a first optical medium by use of a plurality m of different reference beams, each beam bearing information suitably recorded in one or more of a plurality n layers of the second optical medium that are distinct from layers in which information in all other beams is suitably recorded. The generated master hologram is then used to optically holographically stamp, or record, multi-layer bit-oriented optical media by writing all n layers of the volume of the blank optical medium with m recording beams produced by simultaneously illuminating the master hologram with all m different reference beams, each illuminating reference beam being at a different reference angle and from a coherent light source which is incoherent with respect to every other illuminating reference beam. By this generating and this using a high degree of incoherency is obtained, making that during subsequent readout of a selected, focused, layer of the recorded optical medium signals from all other layers will become as background noise having nearly uniform intensity. The method requires a highly non-linear optical medium: a new dye-doped photopolymer is preferred.
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