18 results about "Holographic storage" patented technology

The application relates to a polarization holographic multiplexing display system and method based on an acousto-optic modulator, wherein a beam splitter is arranged in front of a spatial light modulator; a laser, a first linear polarizer and the beam splitter are sequentially arranged on an optical path of the laser; a first lens, a pinhole, a second lens and a first polarization grating are sequentially arranged on a reflection optical path of the beam splitter; four circularly polarized lights are arranged behind the first polarization grating; a reflecting mirror, an acousto-optic modulator, a third lens and an image sensor are sequentially arranged on an optical path of a first light beam; a second polarization grating, a second linear polarizer and an image sensor are sequentially arranged on optical paths of a second light beam, a third light beam and a fourth light beam. The application can obtain three kinds of reconstructed images with different effects at different reconstruction distances, and has a good application prospect in the fields of holographic display, holographic storage and the like.

The invention belongs to the technical field of optical thin films, display imaging and holographic storage, and particularly discloses a chalcogenide phase-change material-based dynamic programmable narrow-band optical filter, a first Bragg reflector, a middle spacing layer and a second Bragg reflector form a Fabry-Perot resonant cavity, the resonant wavelength of the Fabry-Perot resonant cavity is determined by the optical thickness of each thin film, and the thickness of the Fabry-Perot resonant cavity is smaller than that of each thin film. The optical filter is used for outputting different transmission spectrums by changing the central wavelength of filtered light; the chalcogenide phase change material layer is used for realizing on-off and gray scale adjustment of a transmitted spectrum through a phase change process from an amorphous state to a crystalline state; and the top anti-reflection layer is a third transparent dielectric layer, and is used for anti-reflection of the transmitted spectrum and preventing oxidation of the chalcogenide phase change material. According to the invention, excellent narrowband filtering characteristics and high color saturation are realized, and high switch contrast is realized by using significant difference of extinction coefficients before and after phase change of the phase change material.

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.

This invention relates to the field of holographic storage materials technology, specifically to an NVP-doped PQ / PMMA photopolymer holographic storage material and its preparation method. The NVP-doped PQ / PMMA photopolymer holographic storage material uses NVP, MMA, PQ, and AIBN as raw materials. NVP is doped into PQ / PMMA to achieve the photopolymer material as an excellent medium for holographic storage. This material has a simple preparation process, low cost, high diffraction efficiency, and high photosensitivity, making it better suited for holographic imaging and data storage compared to PQ / PMMA.

The present application relates to 3-amino-1,2,4-triazole nitrate polymorphic nonlinear optical crystal material and its preparation and application, the chemical formula of the polymorphic material is (C2H5N4)(NO3), the molecular weight is 147.11, specifically includes two kinds of crystal forms: (1) alpha-(C2H5N4)(NO3) belongs to triclinic system, space group is P1, cell parameter is alpha=110.44~114.63°, (2) beta=93.04~97.71°, gamma=93.49~97.64°, Z=2, the cell volume is compared with prior art, the polymorphic alpha-(C2H5N4)(NO3) and beta-(C2H5N4)(NO3) material involved in the present application has larger frequency doubling effect at 1064nm, and both can realize phase matching.In addition, the ultraviolet absorption cutoff edge of the crystal material is 240nm and 248nm respectively, has wide application prospect in the field of photoelectric technology such as laser frequency conversion, high-speed optical signal modulation, holographic storage system.

The present application relates to the technical field of holographic storage material, in particular to a new type of holographic storage material and a preparation method thereof.The raw materials of the material include PETA, MMA, PQ and AIBN.The material is modified by introducing dendritic molecular material PETA, and after modification, the modified material not only has the air bubble-free characteristic compared with the traditional PQ / PMMA material, but also has improved photosensitive sensitivity of the material system, can significantly shorten the response time of the material, and the introduction of PETA can improve the grating diffraction efficiency uniformity and holographic performance of the material system.

Holographic storage hardware enabled locking includes directing a first reference beam associated with a first process at a storage location in a holographic data storage medium, and detecting, with a detector while the first reference beam is directed at the storage location, whether a second reference beam associated with a second process is also directed at the storage location. Based on the detecting, a signal is generated indicating whether the storage location is locked.

Holographic storage hardware enabled locking includes directing a first reference beam associated with a first process at a storage location in a holographic data storage medium, and detecting, with a detector while the first reference beam is directed at the storage location, whether a second reference beam associated with a second process is also directed at the storage location. Based on the detecting, a signal is generated indicating whether the storage location is locked.

The invention belongs to the field of inorganic chemistry and the field of nonlinear optical materials, particularly provides a niobium oxytellurite sulfate second-order nonlinear optical crystal and a preparation method thereof, and aims to solve the problem that an existing tetrahedron-based nonlinear optical crystal material is small in birefringence and / or relatively weak in nonlinear optical response. The chemical formula of niobium oxytellurite sulfate is Nb2O2 (TeO3) 2 (SO4), the crystal structure is a non-centrosymmetric structure and belongs to a monoclinic system, and the space group is Cc; the crystal material has a moderate frequency-doubled effect and can realize phase matching; meanwhile, the material shows a remarkable birefringence characteristic, has a relatively wide ultraviolet transmission window and relatively high stability, and has a wide application prospect in the fields of laser frequency conversion, photoelectric modulation, laser signal holographic storage and the like; in addition, the niobium oxytellurite sulfate crystal material can be prepared by a hydrothermal method, and is simple in process, mild in preparation condition and easy to implement.

The present invention discloses a non-interferometric, non-iterative complex amplitude reading method and apparatus. The reading method includes the following steps: diffracting a light beam containing amplitude information and phase information to obtain a diffraction pattern with intensity variations; constructing a diffraction intensity-complex amplitude model and training it based on the correlation between the diffraction pattern and amplitude information and phase information, and applying the trained model directly to new diffraction images to obtain amplitude information and phase information. The method can achieve detection of complex amplitude information, including amplitude and phase, from a single diffraction image, improve the stability and accuracy of phase reading results, increase the calculation speed, and simplify the optical system. It is suitable for applications in holographic storage, biomedical image processing, and microscopic imaging, among others.

The utility model relates to a torquer in a coaxial holographic storage system and an electromagnetic structure thereof, the electromagnetic structure comprises a metal frame and a focusing coil, the thickness of the focusing coil is less than 2mm, and the height of the focusing coil is less than 8mm; the height of the tracking coil is less than 3mm, the width of an inner ring is less than 3mm, and the length of the inner ring is less than 8mm; the two permanent magnets are respectively arranged between the tracking coil and the focusing coil at the two ends of the metal frame; and the number of the yokes is two, and the yokes are inverted U-shaped, are respectively arranged at the two ends of the metal frame, and are respectively buckled on the focusing coil, the permanent magnet and the tracking coil at the two ends of the metal frame. It is ensured that a space magnetic field formed by the tracking coil, the focusing coil and the permanent magnet in the two yokes under interaction can generate electromagnetic force with enough strength, and meanwhile the problem that the servo tracking speed of the torquer is reduced due to the fact that the focusing coil and the tracking coil are too large is solved.

The application belongs to the technical field of holographic polymer materials, and particularly relates to a PETMP doped PQ / PMMA photopolymer holographic storage material and a preparation method thereof. The preparation method adds PETMP, MMA, PQ and AIBN, and sequentially carries out mixing, prepolymerization and thermal polymerization to obtain the PETMP doped PQ / PMMA photopolymer holographic storage material. Compared with the traditional PQ / PMMA material, the recording grating diffraction efficiency of the PETMP doped PQ / PMMA photopolymer holographic storage material is improved to more than 80%, the refractive index modulation is higher, and the storage capacity of the material can be effectively improved. At the same time, the diffraction efficiency is greatly improved by doping PETMP, the light response speed is accelerated, better optical properties are exhibited, and the PETMP doped PQ / PMMA photopolymer holographic storage material has a wide application prospect in the field of holographic storage.

The utility model relates to a focusing suspension wire and a torquer in a holographic storage system, the focusing suspension wire is applied to the torquer of the holographic storage system, and the focusing suspension wire comprises a first line segment, a second line segment and a third line segment which are arranged on the same straight line; the first bending part is arranged between the first line segment and the second line segment; the second bending part is arranged between the second line segment and the third line segment; the first bending part and the second bending part are symmetrically arranged, each of the first bending part and the second bending part is composed of three bending line segments, the included angle between the first bending part and the first line segment and the included angle between the second bending part and the second line segment are both larger than 90 degrees, and the included angle between the second bending part and the second line segment and the included angle between the second bending part and the third line segment are both larger than 90 degrees. Therefore, the rigidity of the second line segment in the tracking direction can be effectively improved, and the rigidity in the focusing direction is not changed, so that the function of synchronous movement of the objective lens and the reflector in the tracking direction is realized.

The application provides a double-metal co-doped laminated oxide film, which comprises: a mesoporous TiO2 film on a glass substrate; Au-Ag blended nanoparticles deposited on the mesoporous TiO2 film; amorphous TaO x x is a positive number; a silver film on the amorphous TaO x x is a positive number; a silver film on the amorphous TaO The application also provides an encrypted holographic storage method, which comprises: performing one-time exposure on a first region and two-time exposure on a second region of the double-metal co-doped laminated oxide film by using a pulse laser; holographic storage; NaCl solution brushing; and reading the first region or the second region for holographic storage data. The laminated oxide film is simple in preparation process and easy to operate, and an encrypted holographic storage method is creatively provided; the film can also be used in the field of color printing, and the application range and field of the metal and TiO2 composite film are widened.

The application provides a high-sensitivity photopolymer holographic storage material based on cyclotetrasiloxane and a preparation method thereof, and belongs to the technical field of holographic storage materials, and aims to solve the technical problem of poor photosensitivity of photopolymer materials.The application comprises the following steps: (1) uniformly mixing acrylate monomers, multi-vinyl crosslinking agents, thermal initiators and photoinitiators to obtain a mixed solution; (2) heating the mixed solution to perform a prepolymerization reaction; and (3) performing a thermal polymerization reaction on the prepolymer to obtain the high-sensitivity photopolymer holographic storage material.The application successfully prepares the high-sensitivity photopolymer holographic storage material with a crosslinked macromolecular matrix and rich vinyl groups by adding cyclotetrasiloxane (V4D4) containing four vinyl groups, greatly improves the photosensitivity (more than 3 times) and diffraction efficiency (about 50%) of the material, and realizes the effect of fast data storage (4s storage and 4% bit error rate).

The present application relates to a kind of vanadium iodate second-order nonlinear optical crystal material and its preparation and application, the chemical formula is VO2 (H2O) (IO3), molecular weight is 275.86, belongs to orthorhombic system, its space group is Pca21, cell parameter is α=β=γ=90 °, Z=4, cell volume is The vanadium iodate crystal material of the present application has excellent second-order nonlinear optical performance, under 1200nm laser irradiation, powder frequency doubling intensity is about 18.0 times of potassium dihydrogen phosphate crystal (KDP), under 2100nm laser irradiation, powder frequency doubling intensity is about 1.5 times of potassium titanyl phosphate (KTP), and phase matching can be realized.In addition, vanadium iodate crystal material also has large birefringence, reaches 0.184 at 546nm.The above research results show that the crystal has wide application prospect in the field of laser frequency conversion, photoelectric modulation, laser signal holographic storage etc..

Holographic storage hardware enabled locking includes directing a first reference beam associated with a first process at a storage location in a holographic data storage medium, and detecting, with a detector while the first reference beam is directed at the storage location, whether a second reference beam associated with a second process is also directed at the storage location. Based on the detecting, a signal is generated indicating whether the storage location is locked.