Holographic storage system with improved beam overlap
AssigneeThomson Licensing
InventorsSzabolcs Kautny, Krisztian Banko, Gabor Szarvas, Zoltan Karpati
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Abstract
An apparatus and a method for reading from and/or writing to holographic storage media using a coaxial arrangement of an object beam and one or more reference beams or a coaxial arrangement of a reconstructed object beam and one or more reference beams is proposed. A focus of the one or more reference beams within a holographic storage medium is shifted along the optical axis relative to a focus of the object beam or the reconstructed object beam.
Claims12
An apparatus for reading from or writing to a holographic storage medium, with a coaxial arrangement of one or more reference beams and an object beam or a coaxial arrangement of one or more reference beams and a reconstructed object beam, wherein a focus of the one or more reference beams within the holographic storage medium is located on an optical axis of the object beam or the reconstructed object beam and shifted along the optical axis relative to a focus of the object beam or the reconstructed object beam.
A method for reading from or writing to a holographic storage medium using a coaxial arrangement of one or more reference beams and an object beam or a coaxial arrangement of one or more reference beams and a reconstructed object beam, the method comprising focusing the one or more reference beams to a focus within the holographic storage medium that is located on an optical axis of the object beam or the reconstructed object beam and shifted along the optical axis relative to a focus of the object beam or the reconstructed object beam.
A holographic storage medium with a holographic layer and a patterned mirror layer, the patterned mirror layer comprising one or more reflective areas configured to reflect one or more reference beams, which are surrounded by a transparent or absorptive area of the patterned mirror layer, wherein the reflective areas have a size of about 1 μm.
Dependencies are inferred from the claim text.