91results about "Recording/reproducing/erasing using optical interference patterns" patented technology

A sensor and method for page-based optical data storage. The sensor includes a partially-reflective mirror, a reflective mirror disposed substantially collinear with and spaced apart from the partially-reflective mirror, and an active layer disposed substantially collinear with and between the partially-reflective mirror and the reflective mirror. The partially-reflective mirror has a first and second side and transmits a portion of light incident on the first side. The reflective mirror reflects light incident on the reflective mirror toward the partially-reflective mirror. The active layer absorbs at least a portion of the light oscillating at the resonant frequency.

To improve the production efficiency of a hologram by easily filling a refractive index matching liquid.SOLUTION: In the method for manufacturing the hologram, a superposing member 3 is arranged on one side of a material 1 to be treated having an unexposed photosensitive layer 11 with a gap S, refractive index matching liquid is filled in the gap S between the material 1 to be treated and the superposing member 3, and coherent light is irradiated on the photosensitive layer 11 after filling the refractive index matching liquid to record an interference fringe on the photosensitive layer 11.SELECTED DRAWING: Figure 3

The invention discloses a photopolymer type holographic recording medium and a preparation method and application thereof, the photopolymer type holographic recording medium comprises a writing monomer, and the writing monomer comprises epoxy resin and a polymerizable monomer, the polymerizable monomer is selected from an alkenyl naphthalene compound, an alkenyl anthracene compound, an alkenyl benzene compound, an acrylic acid compound, a methacrylic acid compound, an acrylate compound, a methacrylate compound, N-vinyl pyrrole, N-vinyl carbazole, N-vinyl imidazole, N-vinyl indole and N-vinyl pyrrolidone; the carbazole is at least one of trans-N-3-alkyne butenyl carbazole. According to the epoxy resin disclosed by the invention, the volume shrinkage of the polymerizable monomer after polymerization can be effectively reduced, the cationic polymerization of the epoxy resin can be accelerated while the polymerizable monomer forms free radical polymerization, and the photopolymer type holographic recording medium disclosed by the invention is high in light sensitivity, stable in holographic performance and high in volume holographic grating diffraction efficiency.

A compound represented by the following formula (1): [In the formula, A represents a polymerizable group. n represents an integer of 1 to 3. L represents an optionally branched (n+1)-valent linking group. Z represents an oxygen atom, or a nitrogen atom optionally having a substituent. m represents an integer of 0 or 1. X represents a single bond, an oxygen atom, a sulfur atom, a carbon atom optionally having a substituent, or a nitrogen atom optionally having a substituent. p represents an integer of 0 to 2. When p is 2, the two Xs may be the same or different. Y1 and Y2 are each independently a benzene ring, a naphthalene ring, or a phenanthrene ring. When Y1 or Y2 is a benzene ring, a or b corresponding to Y1 or Y2 is an integer of 0 to 4. When Y1 or Y2 is a naphthalene ring, a or b corresponding to Y1 or Y2 is an integer of 0 to 6. When Y1 or Y2 is a phenanthrene ring, a or b corresponding to Y1 or Y2 is an integer from 0 to 8. R1 and R2 each independently represent an aromatic ring group optionally having a substituent. When a and b are 2 or more, a plurality of R1S and R2s may be the same or different from each other. In the formula, Y1 and Y2 are not both benzene rings and a and b are not both 0.]

A method for storing data in a holographic medium is provided. The method comprises recording a plurality of holograms in one or more at least partially overlapping regions in a holographic medium. The data is stored in a combination of the plurality of holograms. A system for implementing the method is also provided.

A holographic recording medium composition comprising components (a) to (d) below, wherein an amount of allophanate bond units contained in the component (a) relative to a total weight of the components (a) and (b) is 6.5 × 10-4 mol / g or more: component (a): an isocyanate group-containing compound; component (b): an isocyanate-reactive functional group-containing compound; component (c): a polymerizable monomer; and component (d): a photopolymerization initiator.

The invention relates to a benzopyrylium dyestuff of formula (I), wherein R200,R201, R202, R203, R204, R205, R206, R207 and R208 each independently represent hydrogen, C1- to C16-alkyl, C4- to C7-cycloalkyl C7- to C16-aralkyl, C6- to C10-(het)aryl, hydroxy, C1- to C6- alkoxy, or dialkylamino , wherein the dialkylamino is selected from the group consisting of diethylamino, dimethylamino, diisopropylamino, a six-membered, saturated ring linked via the N of the amino group, which can also include an N or O and can be substituted by non-ionic random groups or a combination of at least two thereof, and / or R200 with R201 or R201 with R202 or R202 with R203 and / or R205 with R206 and / or R206 with R207 each independently together form a -CH=CH-CH=CH-bridge, with A representing a -CH2or a -CH2-CH2-bridge, wherein the anion Ann- has a molecular weight of ≥ 200 g / mol and contains no halogen atom.

The present invention relates to a fluorine-based compound, a photopolymerizable composition, a hologram recording medium, a method for producing the same, and an optical element including the same. The fluorine-based compound is contained in the photopolymerizable composition and not only has excellent optical recording characteristics, but also can provide a hologram recording medium having transparent optical characteristics and excellent reliability even in a high-temperature and high-humidity environment, and an optical element including the same.

An image reproduction device 6 reproduces an image including N different parameters of a wavelength range or the like, and comprises: a multiplexed hologram acquisition unit 61 for acquiring N to 2N multiplexed holograms obtained by multiplex-recording interference patterns for each parameter; a parameter selection unit 63 for selecting the parameters one by one; a hologram generation unit 64 for generating a calculation hologram including two light waves having the selected parameters from the multiplexed holograms; and a light wave restoration unit 65 for restoring one of the two light waves from the calculation hologram.

The present invention relates to a holographic recording medium, a method for producing the same, and an optical element including the same. The holographic recording medium has a specific element composition ratio, and thus has excellent optical recording properties, excellent durability against heat and moisture, suitable adhesive strength to a transparent adhesive, and high transparency.

The disclosure relates to a benzopyrylium dye of the formula (I),in which R200, R201, R202, R203, R204, R205, R206, R207 and R208 independently of one another are each hydrogen, C1 to C16 alkyl, C4 to C7 cycloalkyl, C7 to C16 aralkyl, C6 to C10 (het)aryl, hydroxyl, C1 to C6 alkoxy, or dialkylamino, the dialkylamino being selected from the group consisting of diethylamino, dimethylamino, diisopropylamino, a six-membered saturated ring attached via the N of the amino group, which may additionally contain an N or O and may be substituted by nonionic arbitrary radicals, or a combination of at least two thereof, and / or R200 with R201 or R201 with R202 or R202 with R203 and / or R205 with R206 and / or R206 with R207 each independently of one another form a —CH═CH—CH═CH— bridge, and A is a —CH2— or a —CH2—CH2— bridge, where the anion Ann− has a molecular weight of ≥200 g / mol and does not contain a halogen atom.

A holographic storage optical system, relating to the field of holographic storage optics, includes: a first metasurface provided in an optical path of a S-polarized writing light beam, configured to split the writing light beam into a first polarized light and a second polarized light exhibiting an off-axis focusing characteristic; a second metasurface provided in the optical path of the second polarized light, configured to reflect the second polarized light into parallel light; a mask with a target image provided in the optical path of the parallel light; a third metasurface provided in the optical path of the second polarized light and configured to focus the parallel light after it passes through the mask; and a photosensitive material provided at an intersection of the first polarized light and the focused polarized light. The present application simplifies the construction of the holographic storage optical system.

The invention relates to the technical field of information storage, in particular to a dynamic adjustable holographic optical storage medium and a preparation method thereof.The dynamic adjustable holographic optical storage medium comprises an outer ring and a storage medium body, an inner ring is arranged on the inner side of the outer ring, a water storage shell is arranged on the inner side of the inner ring, the top of the water storage shell is not closed, and a containing shell is arranged on the inner side of the water storage shell; the storage medium body is arranged in the placement shell; the fixing mechanism is located at the top of the placing shell, and the fixing mechanism is used for fixing the position of the storage medium body and preventing the storage medium body from shaking in the using process; through mutual cooperation of a water storage shell, a placement shell, a rubber connecting ring, a rubber corrugated pipe, a water passing opening and the like, when the case is vibrated, vibration can be filtered through cooling liquid between the water storage shell and the placement shell, and if the vibration is strong, the cooling liquid shakes the rubber corrugated pipe to do up-down reciprocating motion, so that the vibration is reduced; and a vibration buffering effect is achieved.

To provide a holographic data storage system and a method of exposing an area to a pattern over a sufficient sustaining duration (depending on an output of a beam).SOLUTION: In a method of performing a write operation in a holographic data storage system, a scheduler schedules at least one write operation across several discontinuous write intervals, and, in each of the discontinuous write intervals, a plurality of discontinuous write intervals, in which a region of a holographic recording medium is exposed to an interference pattern resulting from interference between a reference beam and an input beam carrying a set of data has a total duration sufficiently long to cause a sustained state change in the exposed region, thereby the set of data can be recovered from the region by the end of the last write interval of the plurality of discontinuous write intervals.SELECTED DRAWING: Figure 8A

The invention discloses a storage and calculation integrated photon calculation system and method based on a phase change metasurface and holographic light field modulation, and aims to solve the problems that storage and calculation are separated, the dynamic modulation speed is low and the precision is limited in an existing photon calculation framework. The invention provides a hybrid computing architecture which takes a blue-ray disc or a phase change storage wafer as a high-density holographic weight storage medium and is combined with a high-speed spatial light modulator and a photoelectric nonlinear activation circuit. Through an area array parallel reading mechanism, a large-scale weight matrix is read at one time by using beam-expanded coherent light, light velocity matrix multiplication is completed, and interlayer fast switching of the deep neural network is realized in combination with a streaming rotation or light beam scanning technology. According to the invention, the non-volatility and multistage refractive index characteristics of the phase change material are utilized to realize high-density on-chip storage and zero-power-consumption lossless reading of large model weight, and the problems of a video memory wall and an energy consumption wall in large model reasoning are effectively solved.

The present invention relates to a method for producing a cured product for a hologram recording medium, which is a method for producing a cured product for a hologram recording medium by subjecting a composition for a hologram recording medium to a curing reaction, the composition for a hologram recording medium contains a compound (a) having an isocyanate group and a compound (b) having an isocyanate-reactive functional group, and the curing reaction includes a curing step A for curing at less than 35 DEG C, the remaining rate of unreacted isocyanate groups after the curing step A is 10% or less relative to the isocyanate groups in the composition for the hologram recording medium before the curing reaction.

The invention provides fluorine-containing polymer hollow nanoparticles, a photopolymer type holographic recording medium and application of the photopolymer type holographic recording medium, polystyrene nanospheres are swelled by a solution containing a fluorine-containing monomer, a fluorine-containing cross-linking agent and a photoinitiator, and then polymerization reaction is performed to obtain a core-shell nanoparticle emulsion; tetrahydrofuran is added into the core-shell nanoparticle emulsion, the polystyrene nanosphere template in the core-shell nanoparticle emulsion is completely dissolved and extracted out, the fluorine-containing polymer hollow nanoparticles are obtained, the photopolymer type holographic recording medium containing the fluorine-containing polymer hollow nanoparticles enables the sensitivity of a holographic grating to be larger than 100 cm / mJ, and the photopolymer type holographic recording medium can be applied to the holographic grating. The diffraction efficiency of the recording grating is greater than 95%, the refractive index modulation degree is greater than 0.2, the haze is lower than 1%, and the recording grating has excellent shear strength and tensile strength.

A multimode optical waveguide network comprises a parent waveguide and a plurality of child waveguides. Each waveguide is a multimode optical waveguide having a first surface region, multiple second surface regions, and at least one guiding element attached to a surface of the waveguide or embedded within the waveguide, each second surface region of the parent waveguide optically coupled to the first surface region of a corresponding child waveguide. The guiding element(s) of the parent waveguide is arranged to guide a beam, from or to its first surface region, to or from any selected second surface region of its multiple second surface regions. The guiding element(s) of each of the waveguides is configurable for selecting the second surface region of that waveguide and / or responsive to at least one beam characteristic for selecting the second surface region of that waveguide via modulation of the at least one beam characteristic.

The invention provides an optical storage control parameter determination method and device and an optical storage system, and relates to the field of optical storage control, the method utilizes a control parameter set of the optical storage system to perform update feedback processing, generates corresponding control parameters in combination with a corresponding objective function value, and can be combined with a machine learning related model to determine the control parameters of the optical storage system. The control parameter set of the optical storage system can be automatically updated, fed back and processed in real time, and the processing efficiency is improved.

Disclosed herein is an apparatus for recording a hologram. The apparatus for recording a hologram according to the present specification may include a light source unit configured to illuminate an object with light, a housing having a predetermined shape and configured to block outside light, a coupling unit to which a recording medium having a photopolymer composition applied thereto is coupled, a lens unit positioned at a front surface of the housing and configured to form an image on the coupling unit, a filter unit, a backlight unit, and a controller.

The invention relates to a torquer in a holographic storage system and a focusing suspension wire of the torquer, and the focusing suspension wire comprises a first line segment, a first bending part, a second line segment, a second bending part and a third line segment which are sequentially arranged. The first bending part comprises a first bending line segment, a second bending line segment and a third bending line segment. The second bending part comprises a fourth bending line segment, a fifth bending line segment and a sixth bending line segment; the included angle between the first bending line segment and the second line segment, the included angle between the first bending line segment and the second bending line segment, the included angle between the second bending line segment and the third bending line segment, the included angle between the third bending line segment and the first line segment, the included angle between the fourth bending line segment and the second line segment, and the included angle between the fourth bending line segment and the fifth bending line segment; the included angle between the fifth bending line segment and the sixth bending line segment and the included angle between the sixth bending line segment and the third line segment are both larger than 90 degrees. The rigidity of the second line segment in the tracking direction can be effectively improved, and the function of synchronous movement of the objective lens and the reflector in the tracking direction is achieved.

The effective coherence length of a single-frequency, solid-state laser is limited to reduce spurious, secondary holograms in conjunction with a holographic recording. The wavelength of the laser is varied or 'scanned' with high precision over a very small wavelength range. In an embodiment, the temperature of the laser's resonant cavity optical bench is altered, causing the dimension of the cavity to change and the emission wavelength to move in a controlled manner. The changing wavelength is monitored at high resolution, and a feedback control loop updates the temperature set-point to keep the monitored laser wavelength moving at a desired rate of change through a desired range. As the wavelength of the laser is scanned, the phase of the holographic interference pattern is locked at a position of maximum coherence / contrast within the holographic film aperture.

A multimode optical waveguide network includes a parent waveguide and a plurality of child waveguides. Each waveguide is a multimode optical waveguide having a first surface region, a plurality of second surface regions, and at least one guide element attached to or embedded within the waveguide surface, each second surface region of the parent waveguide being optically coupled to a surface region of the first surface region corresponding sub-waveguide. The guiding element of the parent waveguide is arranged to direct a light beam from its first surface area towards any selected one of its plurality of second surface areas, or to direct a light beam from any selected one of its plurality of second surface areas towards its first surface area. The guide element (s) of each waveguide may be configured to select the second surface area of the waveguide and / or to select the second surface area of the waveguide via modulation of at least one beam characteristic in response to the at least one beam characteristic.

A method of performing a write operation in a holographic data storage system is provided. A scheduler schedules at least one write operation across multiple non-contiguous write intervals, the write operation pertaining to data to be stored in a region of a holographic recording medium. The scheduler uses an energy estimation function, for estimating an amount of energy required to complete the at least one write operation, to perform said scheduling. In each of the non-contiguous write intervals, the region of the holographic recording medium is exposed to an interference pattern caused by interference between a reference beam and an input beam carrying the data. The multiple non-contiguous write intervals have a total aggregate duration of sufficient length to cause a persistent state change in the exposed region, such that the data is recoverable from that region within a final write interval of the multiple non-contiguous write intervals.

In an optical data transfer system, a beam modulator is configured to embed a set of data in an input beam. A multimode optical waveguide network has an in-coupling region for receiving the input beam. The multimode optical waveguide network is configured to guide the input beam to an out-coupling region of the multimode optical waveguide network. A spatial coherent detector is configured to measure a phase and an amplitude of an output optical field at multiple locations. The output optical field is at least partially defined by the input beam and thus exhibiting distortion effects caused by the passage of the beam through the multimode waveguide network. Signal processing is applied to an output of the spatial coherent detector, in order to compensate for the distortion effects, and thereby recover, from the output of the spatial coherent detector, the set of data embedded in the input beam.

To provide an optical data transfer system.SOLUTION: In a holographic storage system incorporating multi-waveguide networks, an input waveguide network includes a first input light pipe 203 to which a plurality of second input light pipes 204A, 204B are coupled. An input beam 104 from an emitter system 504 is coupled into the first input waveguide 203 through an in-coupling region thereof, and can be guided from there into the second input waveguide 204A or 204B. A reference waveguide network includes a first reference waveguide 205 to which a plurality of second reference waveguides 206A, 206B are coupled. A reference beam 106, 116 from the emitter system 504 is similarly coupled into the first reference waveguide 205, and can be guided into the second reference waveguide 206A or 206B. An output waveguide network includes a first output waveguide 207 to which a plurality of second output waveguides 208A, 208B are coupled.SELECTED DRAWING: Figure 5

In an optical data transmission system, a beam modulator is configured to embed a data set into an input optical beam. A multimode optical waveguide network has an in-coupling region for receiving the input optical beam. The multimode optical waveguide network is configured to direct the input optical beam to an out-coupling region of the multimode optical waveguide network. A spatially coherent detector is configured to measure a phase and an amplitude of an output optical field at a plurality of locations. The output optical field is at least partially defined by the input optical beam and thus exhibits distortion effects caused by the propagation of the optical beam through the multimode waveguide network. Signal processing is applied to the output of the spatially coherent detector to compensate for the distortion effects, thereby recovering the data set embedded in the input optical beam from the output of the spatially coherent detector.

Disclosed herein are a High-Bandwidth Memory (HBM)-based holography processing apparatus and method. The HBM-based holography processing apparatus includes a holography row processing unit configured to receive image data and output row data of complex numbers obtained by performing a Fast Fourier Transform (FFT) on the image data, a HBM configured to store the output row data as data for each color and for each depth, and a holography column processing unit configured to read the stored row data using a column address and perform FFT processing on the read row data.

An image reproduction device reproduces an image including N different parameters of a wavelength range or the like, and includes: a multiple hologram acquisition part that acquires N to 2N multiple holograms obtained by multiplex-recording interference patterns for each parameter; a parameter selection part that selects the parameters one by one; a hologram generation part that generates a computer generated hologram containing two lightwaves having the selected parameter, from the multiple hologram; and a lightwave restoration part that restores one of the two lightwaves from the computer generated hologram.