Patent ID: 7742209

Claim:
A holographic storage device or system comprising: a reference beam source for generating a reference beam; a data beam source for generating a data beam; a same objective lens through which the data beam and reference beam pass prior to the entering a holographic storage medium; and an objective lens mover for moving the same objective lens in a direction parallel to the upper surface of the holographic storage medium to thereby change an angle of the reference beam relative to the holographic storage medium, wherein the reference beam and data beam, after passing through the same objective lens, interfere to record one or more data pages in the holographic storage medium, wherein the data beam is angled at a first angle with respect to the optical axis of the objective lens when the data beam passes through the objective lens, wherein the reference beam is angled at a second angle with respect to the optical axis of the objective lens when the reference beam passes through the objective lens, wherein the first and second angles are different when at least some of the one or more data pages are recorded in the holographic storage medium, and wherein an angle of incidence of the reference beam on the holographic storage medium is changed by moving the same objective lens in the direction parallel to the upper surface of the holographic storage medium.