Abstract:
A device for retrieving multidimensional data from a data storage medium is provided. The device (103) comprises a source of electromagnetic radiation, an optical data processing system (401) adapted to perform logical operations on an input optical data array, and an optical device or devices (125) adapted to direct electromagnetic radiation onto the surface of a data storage medium and to transmit reflections of the electromagnetic radiation, in the form of multidimensional data patterns, to said optical data processing system. The data may be formatted in multiple dimensions.
Abstract:
The invention relates to an optical holographic device for reading out a data page recorded in a holographic medium (202). The data page comprises data bits. The device comprises means (200) for producing a radiation beam having an intensity, means (201) for directing the radiation beam towards the holographic medium so as to image the data page, means (203) for detecting a set of imaged data bits in the imaged data page, means (204) for counting, among the set of imaged data bits, the number of imaged data bits having a predetermined data state and means (205) for modifying the intensity as a function of this number.
Abstract:
The invention relates to an optical holographic device for recording data bits in a holographic medium (106). The device comprises a light modulator (103) with addressable elements (301), each having an area and at least one optically active sub-area (302) smaller than said area, means for directing a radiation beam towards the light modulator to form an encoded radiation beam so as to record at least first and second data bits (401, 402) in the holographic medium, means (200) for displacing the encoded radiation beam with respect to the holographic medium and means for controlling the displacing means so as to record a third data (403) bit between the first and second data bits.
Abstract:
Apparatus is disclosed that comprises a holographic memory device in which a plurality of data packets are stored as diffractive patterns, a beam system adapted to transmit a reference beam to the memory device to read the packets sequentially, a microlens array, a solid state scanning system (e.g a microoptoelectromechanical device) and a photodetector array in which the microlens array is adapted to focus the output beam corresponding to each data packet on the same spatial area in the central part of a solid state scanning system and the solid state scanning system then routes it to a photodetector array. This allows the use of a fast solid state scanning system, which has a limited angular scanning range, without losing data at the edge of the matrix of points in which the data packet is recorded.
Abstract:
A holographic data storage medium having an anti-reflective coating is described. The anti-reflective coating can be made to reduce reflectivity for S-polarized light over a wide range of incident angles. Moreover, the anti-reflective coating can be made to have a sufficiently high transmittance for the S-polarized light. The coating may improve performance of the holographic data storage medium, and can facilitate higher storage densities than can be achieved without the coating.
Abstract:
The present invention provides a method and apparatus for a multilayer optical articles. A method comprises forming a first multilayer article with a first substrate (104), first adherent (110), and second substrate (106) using a first holder (100) and a second holder (102). The method further comprises forming a second multilayer article with the first multilayer article, a second adherent (112), and a third substrate (114) using the first holder (100) and second holder (102) to grasp the second multilayer article. After removal of the first (100) and second (102) holders, the first (110) and second (102) adherent maintains the second multilayer article in a posture at which the second multilayer article was held by the first (100) and second (102) holders, wherein the first (110) and second (112) adherent comprise a photopolymer such that the article is capable of storing data in a reflective holographic data storage system.
Abstract:
The present invention relates to compositions useful for optically recording or storing data by stimulating a composition having a refraction modulating composition, where a stimulated region of the composition represents one kind of data and a non-stimulated region of the composition represents another kind of data. The present invention also relates to methods of optically recording data utilizing the compositions of the present invention, as well as to optical data storage devices and optical data storage elements which utilize the optical data storage compositions of the invention.
Abstract:
The present invention relates to a method and a system for the storage of data in the form of volume holograms which do not mutually overlap. The storage medium consists of a light-sensitive materail in the form of a plate of thickness D, in which a single hologram is essentially shaped as a cylinder with the minimal possible cross-section. The signal light beam is modulated with data and directed onto the plate-shaped storage material by means of a lens or a convenient optical system, illuminating an area of said material which, for a given amount of data, is the smallest possible. To record a hologram, a reference light beam is used, incident upon the storage material either from the same direction as the signal beam, or opposite thereto. In contradistinction to prior-art solutions, the inventive reference light beam used for recording illuminates, in the most favorable case, the smallest possible volume of the storage material. The holgoram is only written in the portion where the signal and the reference beams overlap, so its volume is equal to the volume illuminated by the reference beam.