摘要:
Method for calibrating a holographic storage system The present invention relates to a method for calibrating a holographic storage system, and to an apparatus for reading from and/or writing to holographic storage media and a holographic storage medium suitable for such method. According to the invention, the method has the steps of: sending a set of test data pages through at least part of the holographic storage system; receiving a set of transmitted test data pages with a detector; comparing the set of transmitted test data pages with the set of sent test data pages; and correcting parameter variations of the holographic storage system based on the results of the comparing step.
摘要:
The present invention relates to a holographic storage system, and more specifically to a method for pixel detection in a coaxial holographic storage system.In a holographic storage system according to the invention, with a coaxial arrangement of an object beam and a reference beam the bright pixels within the object beam have a phase shift of essentially π0 relative to the reference beam. For readout of a data page contained in a reconstructed object beam a detector detects an interference pattern generated by the interference between the reference beam and the reconstructed object beam.
摘要:
A data page for use in a holographic data storage system, and to a method and an apparatus for writing to holographic storage media using such a data page are described. The data page has dark zones for each boundary between phase blocks of a phase mask of the holographic data storage system, which consist of switched-off pixels that are not used for encoding data, and which coincide with the boundaries between the phase blocks.
摘要:
A holographic storage medium is proposed, and more specifically a holographic storage medium with an integrated phase mask layer. The holographic storage medium has a phase mask layer on top of a holographic storage layer, wherein the phase mask layer has one or more phase pattern areas for coupling-in a reference beam and imprinting a phase pattern on the reference beam, and one or more neutral areas for coupling-in an object beam and/or coupling-out a reconstructed object beam.
摘要:
A holographic storage system having an improved data page quality is described. The holographic storage system includes a special optical filter or a special light source for emphasizing the high frequency components of a reference beam and/or an object beam. This is achieved by an optical filter arranged in a Fourier plane, which has a higher attenuation at the center than at the edge. Alternatively, an adapted light source for generating the reference beam and/or the object beam is arranged in a Fourier plane. The light beam emitted by the light source has a higher intensity close to the edge than at is the center.
摘要:
Holographic storage system with multiple reference beams An apparatus for reading from and/or writing to holographic storage media is described, and more specifically an apparatus for reading from and/or writing to holographic storage media with two or more reference beams that overlap inside the holographic storage medium for reading and/or writing a single hologram. The two or more reference beams are mutually incoherent during reading and/or writing.
摘要:
The invention relates to a suspension arm actuator for a plurality of directions of motion, which comprises a suspension arm designed as a two-arm lever and supported against a support and mounted to said support such that it can be pivoted, said suspension arm supporting on one of its lever arms a component that has to be actuated or being operably connected to such a component and being provided with a magnetic drive on the other lever arm for initiating a first swivel motion about an axis extending perpendicularly to the suspension arm, with a magnetic drive being allocated to said suspension arm for initiating a motion perpendicularly to this swivel motion. The invention solves the problem of designing such a suspension arm such that the latter's design is less complicated and laborious. To achieve this, the two magnetic drives are combined in the magnetic drive which is arranged on the lever arm facing away from the component, and this single magnetic drive is formed such that it generates an inhomogeneous magnetic field which allows initiating both the first swivel motion of the component and the motion of the component perpendicularly thereto.
摘要:
A data page for optical data storage for an optical storage system, i.e. a holographic storage system, is presented. The data page includes one or more areas, which are less sensitive against a movement of the data page in a movement direction of the storage medium. A holographic storage medium comprising such data pages is presented. An apparatus for reading from and/or writing to an optical medium comprising such data pages, and to a method for reading and/or writing such data pages is presented.
摘要:
The present invention relates to a holographic storage medium, and more specifically to a holographic storage medium with an integrated phase mask layer.According to the invention, the holographic storage medium has a phase mask layer on top of a holographic storage layer, wherein the phase mask layer has one or more phase pattern areas for coupling-in a reference beam and imprinting a phase pattern on the reference beam, and one or more neutral areas for coupling-in an object beam and/or coupling-out a reconstructed object beam.
摘要:
The present invention relates to an apparatus for writing to optical storage media capable of performing pre-exposure and/or curing of a photo-sensitive material for optical data storage, in particular for holographic data storage.The apparatus has a first light source for emitting a first light beam, a second light source for emitting a second light beam, and a spatial light modulator, which is switchable between at least two states for spatially modulating at least a part of the first light beam, and which is arranged such that in a first state it directs the first light beam towards an optical storage medium, and that in a second state it directs the second light beam towards the optical storage medium.