Phase correlation multiplex holography
AssigneeLucent Technologies Inc.
InventorsKevin Curtis, William Larry Wilson
Life of this patent
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Abstract
Holograms within an array are recorded and/or read out by use of a reference/read out beam produced by illumination of a phase mask.
Claims33
Holographic process in which an array of individual partially overlapping holograms is recorded in a recording medium, the process comprising recording each individual hologram at an individual location by interfering a reference beam and a signal beam, and by moving the medium and the beams relative to each other to locate each individual hologram,
- CHARACTERIZED IN THAT
- the reference beam used for recording the individual holograms of the array, as measured at the position of interference, is a phase beam of unchanging content containing a multiplicity of rays of non-uniform angle of incidence and of non-uniform phase, the reference beam having a position-to-position self-similarity such that its auto-correlation function has a value which is sufficiently small to enable selection of individual holograms of the array.
Holographic process comprising reconstruction of individual holograms contained in an array of partially overlapping individual holograms recorded in a medium, the process comprising illumination with a readout beam which is successively positioned by movement of the beam and the medium relative to each other in order to locate each individual hologram
- CHARACTERIZED IN THAT
- the readout beam used for reconstructing the individual holograms of the array, as measured at the medium, is a phase beam of unchanging content containing a multiplicity of rays of non-uniform angle of incidence and of non-uniform phase, the readout beam having a position-to position self-similarity such that its auto correlation function has a value which is sufficiently small to enable selection of individual holograms of the array.
Article including a holographic array of partially overlapping holograms comprising a medium containing signal information and selection information for uniquely reconstructing an individual hologram in a succession of displaced holograms
- CHARACTERIZED IN THAT
- the selection information takes the form of the pattern of a phase beam which has a position-to-position self-similarity such that its auto-correlation function has a value which is sufficiently small to enable selection of the individual hologram.
Dependencies are inferred from the claim text.