Patent ID: 7453611

Claim:
An apparatus for replicating holographically recorded data, comprising: a holographic master media having holographically recorded data thereon; a holographic copy media; a light source for generating a master reference beam, incident on the holographic master media, the holographic master media diffracting the master reference beam to provide a first object beam, and for generating a copy reference beam, coherent with the first object beam and incident on the holographic copy media; and a first optical relay system, disposed between the holographic master media and the holographic copy media, for relaying the first object beam from the holographic master media to the holographic copy media, the holographic copy media recording an interference pattern between the first object beam and the copy reference beam, thereby replicating at least a portion of holographically recorded data, wherein the path length difference between the first object beam and the copy reference beam at any point in the holographic copy media at which holograms are copied is substantially within the coherence length of the light source.