29results about "Optical recording/reproducing" patented technology

An alkali-free glass sheet according to the present invention contains, as a glass composition, in mol %, from 60% to 80% of SiO2, from 12% to 15% of Al2O3, from 1.2% to 4% of B2O3, from 0% to 0.5% of Li2O+Na2O+K2O, from 2% to 8% of MgO, from 2% to 11% of CaO, from 0% to 5% of SrO, from 0% to 5% of BaO, and from 10% to 16% of MgO+CaO+SrO+BaO, in which a mol % ratio B2O3 / Al2O3 is from 0.1 to 0.3, a mol % ratio (B2O3+BaO) / SiO2 is from 0.01 to 0.1, and MgO+CaO+SrO+BaO—Al2O3 is from −2% to +2%.

An interferometric scattering microscope comprising: a solid immersion lens provided in a sample solution comprising an object, wherein an interaction between the object and the surface of the solid immersion lens arises; an illumination source; a detector; and an optical system arranged to direct illuminating light from the illumination source onto the surface of the solid immersion lens, collect output light from the surface of the solid immersion lens and to direct the output light to the detector, is provided.

The invention relates to the technical field of ultrafast optical storage, in particular to an ultrafast optical storage material screening method based on pseudo slippage and a storage device. Screening out a material of which the spatial inversion symmetry is broken and the band gap is within a preset range as a driving layer material, and screening out a material of which the spatial inversion symmetry is not broken or the band gap is greater than the band gap of the driving layer material as a substrate material; performing lattice matching processing on the driving layer material and the substrate material to construct a heterojunction structure; performing optical excitation simulation on the heterojunction structure, and simulating a laser excitation process by introducing a time-varying electric field so as to verify whether the pseudo-slip effect of the heterojunction structure occurs or not; according to the method, optical property calculation is carried out on the heterojunction structure with the pseudo-slip effect, optical property differences before and after pseudo-slip are compared to determine optical parameters of data reading, and limitation of a material system is broken through while the power consumption problem is reduced.

An interferometric scattering microscope comprising: a solid immersion lens provided in a sample solution comprising an object, wherein an interaction between the object and the surface of the solid immersion lens arises; an illumination source; a detector; and an optical system arranged to direct illuminating light from the illumination source onto the surface of the solid immersion lens, collect output light from the surface of the solid immersion lens and to direct the output light to the detector, is provided.

The present disclosure provides a volume hologram laminate comprising a substrate, and a volume hologram laminate portion placed on one surface of the substrate, wherein the volume hologram laminate portion includes, from a substrate side, a resin layer including transparent resin; an inhibiting layer placed in a pattern form, in contact with the resin layer; and a volume hologram layer, on which an interference fringe is recorded, placed in contact with the resin layer and the inhibiting layer, in this order, and an inhibiting layer-formed region including the inhibiting layer and an inhibiting layer-non-formed region including no inhibiting layer differ in a color of a reproduction image from the volume hologram layer.

The present disclosure provides a method and system for high-speed information readout based on a fluorescence defect in a solid material, which can be applied in the technical field of optical information storage. The method comprises: determining a readout parameter set, wherein the readout parameter set is configured to perform parallel information reading on N points to be read which are comprised in a solid material, said points have fluorescence defects, and different fluorescence defects correspond to different pieces of information to be read; on the basis of the readout parameter set, exciting the fluorescence defect at each of said N points, and reading the number of photons at each of said N points to obtain at least one piece of fluorescence data, wherein the fluorescence data comprises the number of photons corresponding to each of M points to be read, the number of photons corresponds to the fluorescence defect of the corresponding point to be read, M and N are positive integers, and M is less than or equal to N; and on the basis of the at least one piece of fluorescence data and a preset mapping relationship, obtaining the information to be read stored at each of said N points.

A security tag 1 includes a plurality of colloidal particles 10 and a resin layer 20. The plurality of colloidal particles 10 are, when in a state of being embedded in the resin layer 20, arranged so as to be spaced apart from each other in a plane direction perpendicular to the thickness direction, and at least one type of two-dimensional crystal R1 composed of the plurality of colloidal particles 10 is present.

The present application relates to a photopolymer composition, a holographic recording medium, a method for producing the same, and an optical element containing the same. The photopolymer composition can provide a holographic recording medium and an optical element containing the same that not only have excellent optical recording properties but also exhibit excellent reliability and transparency even in high-temperature environments.

A method for measuring a property of an object, the method comprising: dipping a solid immersion lens into a solution comprising the object, such that the object interacts with the surface of the solid immersion lens; illuminating the surface of the solid immersion lens with an illumination source and detecting the scattered light from the object using an interferometric scattering microscope; measuring a property of the object using the detected scattered light; withdrawing the solid immersion lens from the solution; and subsequently cleaning the solid immersion lens such that the object is removed from the surface of the solid immersion lens.

The invention relates to a scanner system (10) for use in an apparatus (100) for producing three-dimensional workpieces by applying electromagnetic radiation or particle radiation to raw material powder layers, the scanner system (10) comprising a pivotable scanner mirror (12) having a first surface (14) configured to be impinged upon by an irradiation beam (116) emitted by a radiation source (114). Furthermore, the scanner system (10) comprises a scanner mirror cooling device (22) having first coolant supply equipment (26) configured to conduct a first coolant flow (28) over and / or on the first surface (14) of the scanner mirror (12).

An object of the present invention is to provide a glass capable of suppressing deformation such as warpage of a glass substrate, having excellent formability, imposing a low burden on production equipment, and facilitating production of a large and thin glass substrate.SOLUTION: The glass of the present invention has a density, a Young's modulus, a strain point, a temperature T4 at which the glass viscosity becomes 104 dPa·s, a glass surface devitrification temperature (Tc), and a thermal expansion coefficient within predetermined ranges, and the contents of at least one alkali metal oxide selected from the group consisting of SiO2, Al2O3, Li2O, Na2O, and K2O, and P2O5 are within predetermined ranges.SELECTED DRAWING: None

This application relates to a holographic recording medium and an optical element including the same. The holographic recording medium not only has excellent optical recording characteristics but can also exhibit excellent reliability and transparency even in high-temperature environments.

The present invention relates to a holographic recording medium and an optical element including the same. The holographic recording medium not only has excellent optical recording properties, but also exhibits transparent optical properties and excellent reliability even in high temperature and high humidity environments.

The invention relates to a method and a device (1) for producing coherent Smith-Purcell electromagnetic radiation, which device comprises: an electrically conductive diffraction grating (5) laterally defined by two electrically conductive outer side walls (51, 52); a source (7) for generating an electron beam (11) above the diffraction grating (5), the electron beam being configured to interact with the diffraction grating so as to produce coherent Smith-Purcell electromagnetic radiation (3) directed upstream of the diffraction grating (5) in a predetermined direction; and a mirror (9) configured to collect all of the electromagnetic radiation and redirect it parallel to the diffraction grating (5) to an exit (15) downstream of the diffraction grating (5).

Disclosed are methods and configurations for monitoring reflections in heat-assisted magnetic recording (HAMR) heads that may lead to laser instability and power variation. HAMR heads direct light emitted by a laser toward a near field transducer (NFT) for the production of plasmons that assist in data recording. A certain amount of the laser light may be reflected at or near the NFT back toward the laser, and this reflected light can cause laser instabilities over time. As a screening measure during manufacturing or assembly, or as a laser health monitoring measure during drive operation, a back reflection monitor is used to detect the intensity of a portion of the reflected light. Back reflection monitoring capability may be provided by a bolometer integrated into HAMR recording head assemblies, and optionally along with optical components and electrical circuitry that provides laser light transmission monitoring capability.

A super-resolution system for nano-patterning is disclosed, comprising an exposure head that enables a super-resolution patterning exposures. The super-resolution exposures are carried out using electromagnetic radiation and plasmonic structures, and in some embodiments, plasmonic structures having specially designed super-resolution apertures, of which the “bow-tie” and “C-aperture” are examples. These apertures create small but bright images in the near-field transmission pattern. A writing head comprising one or more of these apertures is held in close proximity to a medium for patterning. In some embodiments, a data processing system is provided to re-interpret the data to be patterned into a set of modulation signals used to drive the multiple individual channels and multiple exposures, and a detection means is provided to verify the data as written.

The invention discloses a novel photoresponse coordination compound. At least one photochromic unit is arranged on a coordination ligand of the novel photoresponse coordination compound. The photoresponsive coordination compound is proved to be capable of being used as an electroactive material for manufacturing an organic memory device and a light-operated electron transport material.

One example provides a computer-implemented method for reading data stored as birefringence values ​​in a storage medium. The method includes: acquiring an image of a voxel in the storage medium; applying a first low-pass filter having a first cutoff frequency to the voxel image to obtain a first background image; applying a second low-pass filter having a second cutoff frequency to the voxel image to obtain a second background image, the second cutoff frequency being different from the first cutoff frequency; determining an enhancement background image from the first and second background images; determining birefringence values ​​for the enhancement background image; determining birefringence values ​​for the voxel image; and correcting the birefringence values ​​of the voxel image based on the birefringence values ​​of the enhancement background image.

A light detection and ranging (LiDAR) system is provided including a beam steering device configured to modulate a phase of light from a light source and to output light in a plurality of directions at the same time, a receiver including a plurality of light detection elements configured to receive light that has been irradiated onto an object in the plurality of directions from the beam steering device and reflected from the object, and a processor configured to analyze position-specific distribution and / or time-specific distribution of light received by the receiver and to individually process the light lights irradiated onto the object in the plurality of directions.

A security tag that includes a resin layer, and a plurality of colloidal particles. The plurality of colloidal particles are embedded in the resin layer and arranged, spaced apart from one another, along a planar direction perpendicular to a thickness direction. The plurality of colloidal particles constitute at least one type of two-dimensional crystal.

A method includes selecting a period for a volume Bragg grating (VBG) such that a spectral selectivity of the VBG is at least as wide as a spectral width of a broadband light beam that is to be spatially transformed, selecting a desired beam transformation for the broadband light beam, passing a first light beam from a recording light source through an optical device to a volume holographic recording medium where the optical device is configured to induce the desired beam transformation, directing a second light beam from the recording light source to the recording medium, and converging the first light beam and the second beam at a recording angle such that a spatial refractive index modulation profile is recorded in the recording medium that provides the VBG with the selected period, and a phase profile is embedded in the VBG that induces the desired beam transformation for each spectral component within a spectral width of the VBG.

The utility model provides a portable record player, including record player main part, the front of record player main part is equidistant and is provided with a plurality of containing cavities, each containing cavity is placed with record, each containing cavity is provided with the storage subassembly for storing record, sponge is arranged in the circular groove of storage board upper end in the utility model, when the record is placed on the sponge, the direct contact of record and storage board can be buffered by sponge, avoids the scratch of record surface because of rubbing, simultaneously, the positioning column of circular groove middle part is through the sponge, can make the record set positioning through the center hole, prevents the deviation, the shaking of record in the process of accomodating or carrying, further protects the record line integrity, guarantees the playback sound quality, the rotatable connection of storage board is connected with the containing cavity inner wall through the pivot, cooperates the bump on the baffle, and the user only needs to pull the bump to drive the storage board to rotate ninety degrees to spread with the pivot as the pivot, directly takes or places the record, and the operation is simple and laborsaving.

An optical device comprises a monolithic body of a volume holographic recording medium; and a transmitting volume Bragg grating, VBG, recorded in the body, the VBG having a uniform grating period and the body having a thickness such that a spectral selectivity of the VBG is at least 5 nm. The VBG comprises a periodic refractive index modulation defined by a grating vector and a holographically encoded phase profile that varies spatially across a transverse aperture of the VBG. The holographically encoded phase profile induces a spatial beam transformation on a beam diffracted by the VBG, the spatial beam transformation being identical for each spectral component within the spectral selectivity of the VBG.

The invention discloses an optical storage medium multi-layer reading system and an error correction method, and the system comprises a focusing imaging module which is used for focusing parallel light beams in an optical storage medium, so as to form a first reading surface light spot and a second reading surface light spot, the projection module is also used for projecting the first reflecting surface light spot and the second reflecting surface light spot to the first reading module and the second reading module respectively; the first reading module reads the light spot of the first reflecting surface through the first detector; the second reading module reads the light spot of the second reflecting surface through the second detector; the focusing servo module is used for enabling the first detector and the first data recording layer to be in and keep an object image conjugate relation by adjusting the position of the optical disc; the correction module is used for enabling the second detector and the second data recording layer to be in an object-image conjugate relation and keeping the object-image conjugate relation by adjusting the light path from the light spot of the second reflecting surface to the second detector. Through accurate light path design and object image conjugate relation control, synchronous and interference-free reading of two data recording layers in the optical disc can be realized under the condition of using a traditional point light source, and the information reading speed and efficiency of the optical storage equipment are remarkably improved.

An apparatus for electromagnetically characterizing the internal features of an object includes a lens disposed between a source of electromagnetic energy and the object. The lens is made of a first material having a first dielectric constant. An opening is formed in the first material, the opening containing or configured to receive one or more second materials having a corresponding second dielectric constant different from the first dielectric constant. The opening is configured such that the lens has a gradient refractive index when the opening contains one or more second materials. An electromagnetic wave generated by the source and incident as a spherical wave onto a first surface of the lens exits a second surface of the lens substantially as a plane wave. The second surface of the lens contacts a receiving surface of the object, and the refractive index of the lens at the second surface of the lens substantially matches the refractive index of the object at the receiving surface to increase the penetration of the plane wave into the object.

Hard disk drives (HDD), preamplifiers for HDDs, and preamplifier circuits for HDDs. In an aspect, a preamplifier circuit might comprise one or more digital-to-analog converters (DAC) that can help reduce a thermal drift of a laser that assists in writing data to a storage medium of the HDD. A first DAC might skew a bias current between a laser power transducer and a temperature sensing transducer to reduce thermal drift. A second DAC might modify a differential current between two legs of the preamplifier circuit to further reduce thermal drift. In some cases, a calibration DAC can calibrate the output of the circuit.