Abstract:
A quantum memory system includes a chalcogenide optical fiber link (120), a magnetic field generation unit (150) and a pump laser (180). The chalcogenide optical fiber link includes a photon receiving end (126) opposite a photon output end (128) and is positioned within a magnetic field of the magnetic field generation unit when the magnetic field generation unit generates the magnetic field. The pump laser is optically coupled to the photon receiving end of the chalcogenide optical fiber link. The chalcogenide optical fiber link includes a core (122) doped with a rare-earth element dopant. The rare-earth element dopant is configured to absorb a storage photon from the storage photon generator (170) traversing the chalcogenide optical fiber link upon receipt of a first pump pulse output by the pump laser. Further, the rare-earth element dopant is configured to release the storage photon upon receipt of a second pump pulse output by the pump laser.
Abstract:
A medium for recording information is disclosed which is capable of providing high quality, high information density recording by thermal deformation. The medium comprises a layer (10) of amorphous material solvent-coated on a support (20) which layer is capable of being thermally deformed to form depressions (D) or holes surrounded by sharply defined ridges (R) when impinged upon by a high energy recording beam. The layer, which comprises a thermoplastic binder and an absorptive substance which absorbs energy at the wavelength of the beam, is less than 0.45 micron thick and has an absorption factor of 20 or greater at the wavelength of the beam.
Abstract:
Procédé de sauvegarde de données numériques sur un support photographique (1) notamment en bande, de préférence une bande de film 35 mm, comportant l'étape consistant à imager sur le support (1) des blocs (14) de pixels encodant l'information à sauvegarder et au moins un repère spatial (11) séparé des blocs de pixels par au moins une rangée de pixels éteints. L'espacement des pixels des blocs dans le sens longitudinal et dans le sens transversal du support photographique par des pixels éteints permet de diminuer leur taille et d' obtenir paradoxalement une plus grande densité.
Abstract:
A method for rewriting data in a three-dimensional optical memory device in which a created bit can be shifted, and the data can be rewritten and which is fabricated in glass by an ultra-short light pulse. In the method, a bit (23) is three-dimensionally created in a glass (18) by a light-induced variation of the index of refraction by applying a first ultra-short pulse laser beam, a second ultra-short pulse laser beam having an energy smaller than that of the first ultra-short pulse laser beam is applied to the three-dimensionally created bit (23), the laser beam is focused by a focusing lens (17) at a point shifted a predetermined distance in the opposite direction to that of the propagation of the laser beam from the bit (23) to be moved, and thus the bit (23) is moved to rewrite the bit.
Abstract:
An optical data storage system is contemplated, one employing a data-modulated writing laser beam and a non-erasing reading laser beam of predetermined wavelength. Improved optical media (10) for such systems are described, these characterized by multiple layers (12, 13, 14, 15) whose optical characteristics and thickness are chosen to accomodate a prescribed writing and reading energy and wavelength and so provide an anti-reflection condition for unrecorded portions of the medium and a relatively higher reflectivity for recorded portions. A preferred optical medium (10) includes a highly reflective aluminum layer (13), a relatively transparent polymer spacer layer (14) overlying the reflective layer (13), and an absorber layer (15) overlying the nucleation layer, the absorber layer (15) being rendered in an island configuration, adapted to be so affected by the contemplated write beams as to "agglomerate" and better transmit the read beam.
Abstract:
The present invention refers to a method for switching the polarization of a ferroelectric material by applying a polarized coherent light at a light polarization angle θ, and while the polarized coherent light is being applied, varying said light polarization angle θ. Additionally, the invention is directed to a method for writing data in a data storage device comprising switching the polarization of a ferroelectric material according to the method of the invention and to a data storage device comprising a ferroelectric material wherein the stored data is written by switching the polarization of the ferroelectric material according to the method of the invention.
Abstract:
A multilayer fluorescent optical storage medium (203) has data layers (210) with fluorescent pits (211, 321) for storing the information. The pits (211, 321) on each of the layers (211) are organized to define a plurality of stills (316). Each stack of stills (316) can be read without lateral movement of the reading head. An eight-to-ten code for encoding information to be stored is also used.
Abstract:
A heat-sensing arrangement, one employing a recording monitoring laser system (LS) in which a laminated improved optical recording film medium (1) for such systems is described. The recording medium is characterized as being an ultra-thin layer of absorber material (5) rendered in the form of discontinuous, or island, configuration and is adapted to be so affected by an appropriate test-level of heat energy as to "agglomerate" and better optically translate the monitor laser beam for recording purposes.
Abstract:
Optical networks may store information or data therein by maintaining the information or data in motion. The optical networks may include optical fiber rings configured to receive optical signals comprising the information or data and to circulate the optical signals within the optical fiber rings. The optical signals and the information or data may be transferred out of the optical fiber rings in order to amplify the optical signals (e.g., to overcome losses due to attenuation within the optical fiber rings), to analyze the optical signals according to one or more processing techniques, or to transfer the information or data to another computer device upon request. If continued storage of the information or data is required, an optical signal including the information or data may be transferred back into the optical fiber rings and may continue to circulate therein.
Abstract:
A quantum memory comprising: a storage medium, the storage medium having a ground state energy level, an excited state energy level and a storage state energy level; a first radiation source arranged to generate a pulsed control field for reading and writing to the storage medium by stimulating off-resonant transitions between the storage state and the excited state; a second radiation source arranged to generate a pulsed signal field containing a signal to be written to the storage medium, said second radiation source being arranged to stimulate off-resonant transitions between the ground state and the excited state; and a third radiation source arranged to generate a pump field for stimulating transitions out of the storage state of the storage medium. The highly off resonant approach of this scheme is distinguished from the previously demonstrated cold-atom approach in that the detuning can be significantly greater than (e.g. approximately four times) the inhomogeneous linewidth, rendering it both immune to inhomogeneous broadening, and thereby suited to room-temperature or higher operation, and amenable to large optical bandwidths.