Patent ID: 8284469

Claim:
An apparatus for writing a data page with a data pattern to a holographic storage medium, with a common aperture arrangement of an object beam and one or more reference beams, wherein the apparatus comprises: a light source for generating a light beam; one or more spatial light modulators for imprinting a pattern onto the light beam to generate the object beam and the one or more reference beams, wherein said pattern is a superposition of the data pattern of the page and a modulation pattern having a spatial frequency higher than a spatial frequency of the data pattern; and a pair of Fourier lenses and a spatial filter arranged in a common focal plane of the pair of Fourier lenses for filtering the object beam and the one or more reference beams; and a Fourier objective lens for illuminating the one or more reference beams and the object beam carrying the data page into the holographic storage medium, wherein the same portion of the Fourier objective lens is used for illuminating the one or more reference beams and the object beam into the holographic storage medium.