| 摘要 |
PROBLEM TO BE SOLVED: To increase the achievable density/capacity of a holographic medium. SOLUTION: Disclosed is a multiplexing method and apparatus that allows holograms to be spatially multiplexed with partial spatial overlap between neighboring stacks of holograms. Each individual stack can additionally take full advantage of an alternate multiplexing scheme such as angle, wavelength, phase code, peristrophic, or fractal multiplexing, for example. An amount equal to the beam waist of the signal beam writing a hologram separates individual stacks of holograms. Upon reconstruction, a hologram and it's neighbors all are read simultaneously. An filter is placed at the beam waist of the reproduced data such that the neighbors that are read are not transmitted to the camera plane. Alternatively, there unwanted reproduction can be filtered out with an angular filter at an intermediate plane in the optical system that has a limited angular pass-band. COPYRIGHT: (C)2008,JPO&INPIT |
