100 results about "Holographic grating" patented technology

The invention belongs to the technical field of optical materials, and discloses a holographic polymer dispersed liquid crystal composition, a holographic grating and a preparation method. The composition comprises the following components in parts by mass: 0.5-1.5 parts of a photoinitiator, 2-5 parts of a co-initiator, 15-20 parts of a first monomer, 15-20 parts of a second monomer, 10-15 parts of a third monomer, 10-15 parts of a solvent and 10-20 parts of mixed liquid crystal. Wherein the first monomer is a monofunctional acrylic monomer, the second monomer is a bifunctional acrylic monomer, the third monomer is a polyfunctional acrylic monomer, the mixed liquid crystal comprises 10-25 wt% of a monomer liquid crystal and 75-90 wt% of a nematic liquid crystal, and the monomer liquid crystal contains fluorine as a benzene ring substituent and contains cyano or isothiocyano as an end group. Through cooperation of the monomer liquid crystal and the nematic liquid crystal in the mixed liquid crystal and cooperation of fluorine atoms and cyano / isothiocyano groups in the monomer liquid crystal, the holographic grating prepared from the composition has the characteristics of low haze and high diffraction efficiency, and the grating can be thinner, so that the requirements of light weight and clearness of AR glasses can be met.

The invention discloses a preparation method of a polymer dispersed liquid crystal holographic grating with s polarization high diffraction characteristics, and belongs to the technical field of holographic optics. Raw materials comprise 60-90% of a thiol-ene monomer, 10-40% of liquid crystals, a photoinitiator accounting for 1.25% of the mass of the monomer, and a coinitiator accounting for 1.56% of the mass of the monomer. Light with the wavelength of 532 nm and the light intensity of 5-30 mW / cm < 2 > is used for carrying out double-interference photoetching to generate photochemical reaction so as to generate the polymer grating film, and the light is s polarized light. Under the optimal recording condition, delta n under s polarization can reach 1.93 * 10, and delta n under p polarization can reach 1.21 * 10. In combination with morphology analysis, it is found that refractive index modulation strongly depends on the proportion of a liquid crystal-rich phase to a polymer-rich phase in the grating. It is proved that the size of liquid crystal microdroplets formed by holographic recording is larger due to low recording intensity, and therefore the threshold driving voltage of the HPDLC grating is reduced.

The invention discloses a photovoltaic ecological system based on a holographic frequency division technology. The photovoltaic ecological system comprises a frame body; the frequency-division concentrating photovoltaic unit comprises a substrate layer which is formed by connecting a heat conducting plate and a dodging plate and is connected with the frame body through a reciprocating motion mechanism, a concentrating layer and a holographic grating layer which are sequentially arranged above the heat conducting plate, and a photoelectric conversion battery arranged on the heat conducting plate; the light adjusting unit is arranged between the two adjacent frequency division concentrating photovoltaic units and comprises two frequency division plates connected through a rotating pair, and the ends, away from each other, of the two frequency division plates are connected with the corresponding frequency division concentrating photovoltaic units through rotating pairs; the reflective optical baffles are arranged on the two sides of the substrate layer, and side wall batteries are further arranged on the sides, close to the light adjusting units, of the reflective optical baffles. According to the invention, through a spectrum frequency division and space light energy distribution mechanism, multi-band efficient utilization of sunlight is realized, the light quality and the light quantity required by plant photosynthesis are guaranteed, and the photovoltaic power generation efficiency is improved.

The invention provides a volume holographic grating exposure parameter determination method and a two-dimensional pupil expansion volume holographic optical waveguide, and the method comprises the steps: carrying out the multiple rotation of a vector of a first light beam, a vector of a second light beam and a holographic photosensitive material when the wavelengths of the first light beam and the second light beam are first recording wavelengths, the rotated vectors of the first light beam and the second light beam and the rotated material position of the holographic photosensitive material are obtained; converting the wavelengths of the first light beam and the second light beam into a second recording wavelength, and rotating the rotated vectors of the first light beam and the second light beam at least once to obtain in-material vectors of the first light beam and the second light beam; determining the in-air vectors of the first light beam and the second light beam according to the in-material vectors of the first light beam and the second light beam; and determining incident angles of the first light beam and the second light beam according to the in-air vectors of the first light beam and the second light beam. According to the method, the manufacturing efficiency of the two-dimensional pupil-expanding body holographic optical waveguide comprising the coupling-in, turning and coupling-out body holographic grating can be improved.

The invention discloses a thiophene monomer, a holographic recording medium, a preparation method and a related device, the structural general formula of the thiophene monomer is shown in the specification, the refractive index of the monomer is larger than 1.8 and smaller than 1.9, the diffraction efficiency can be remarkably improved, the thiophene monomer is applied to preparation of a photopolymer type holographic recording medium, and the photopolymer type holographic recording medium with the sensitivity larger than 100 cm / mJ can be obtained. According to the holographic recording medium, the diffraction efficiency of the recording grating is larger than 95%, the refractive index modulation degree is larger than 0.1, and the shrinkage rate is lower than 1%, and further, the holographic recording medium can be used for preparing a volume holographic grating, a holographic optical element and an optical device.

The invention discloses a (methyl) acrylate monomer, a holographic recording medium, a preparation method and a related device.The structural formula of the (methyl) acrylate monomer is as shown in G1-G19. The preparation method is easy to operate and high in synthesis yield, and further, the holographic recording medium can be applied to holographic recording. According to the photopolymer holographic recording medium, the (methyl) acrylate monomer with the structure is introduced into the photopolymer holographic recording medium, so that the holographic recording medium with high sensitivity, high diffraction efficiency and no yellowing is obtained, and the invention further provides a preparation method of the holographic recording medium. The invention also provides a volume holographic grating, a holographic optical element and an optical device comprising the holographic recording medium.

The invention discloses a (methyl) acrylate monomer, a holographic recording medium, a preparation method and a related device.The structural formula of the (methyl) acrylate monomer is as shown in G1-G5. The preparation method is easy to operate and high in synthesis yield, and further, the holographic recording medium can be applied to holographic recording. The (methyl) acrylate monomer with the structure is introduced into the photopolymer type holographic recording medium, reverse migration of a short polymer chain can be effectively inhibited, and therefore the holographic recording medium with high sensitivity and high diffraction efficiency is obtained, and the invention further provides a preparation method of the holographic recording medium. The invention also provides a volume holographic grating, a holographic optical element and an optical device comprising the holographic recording medium.

The invention discloses a dendritic (methyl) acrylate monomer, a holographic recording medium, a preparation method and a related device. Wherein the structural formula of the dendritic (methyl) acrylate monomer is shown as G1-G12, the preparation method of the dendritic (methyl) acrylate monomer is simple and easy to operate, and further, the dendritic (methyl) acrylate monomer with the structure is introduced into the photopolymer type holographic recording medium, so that the photopolymer type holographic recording medium is prepared. The invention further provides a preparation method of the holographic recording medium, a volume holographic grating containing the holographic recording medium, a holographic optical element containing the holographic recording medium and an optical device containing the holographic recording medium.

The invention discloses a dithiocarbamate monomer, a holographic recording medium, a preparation method and a related device, the structural general formula of the monomer is as shown in G1 and G2, R1 represents any one of hydrogen, halogen and C1-C4 alkyl, R3 represents any one of hydrogen, halogen and C1-C4 alkyl, A1 represents C1-C4 alkyl, A2 represents hydrogen or methyl, n is a positive integer, and n = 1-10. The dithiocarbamate monomer provided by the invention has high refractive index, and the holographic recording medium with high sensitivity, high diffraction efficiency and high refractive index modulation degree can be obtained by applying the dithiocarbamate monomer to preparation of the photopolymer holographic recording medium; holographic recording media can be used to prepare volume holographic gratings, holographic optical elements, and optical devices.

The invention provides a photopolymer system, a grating device containing a chirp structure and a preparation method of the grating device. Visible light and ultraviolet light dual initiators and azobenzene polymerizable acrylate monomers are introduced into the photopolymer system; by utilizing the characteristics that an acrylate group can be used as a writing monomer to participate in a copolymerization process and an azobenzene group can be subjected to continuous photoisomerization during holographic exposure, a visible light photoinitiator and an ultraviolet light initiator driving system are reacted and cross-linked in sequence; a chirp structure is induced to be generated in the formed volume holographic grating while the photopolymer system records interference fringes, so that grating period change caused by material shrinkage is effectively compensated, the angle response bandwidth of the grating is remarkably widened, the requirement for refractive index modulation of the photopolymer system is reduced, and the optical grating has a wide application prospect. According to the invention, the selection range of the photopolymer system is widened, the overall aging resistance of the material system is improved, and the service life of the grating device is prolonged.

The invention provides a polymer composition, a polymer film material, a holographic grating, a preparation method of the holographic grating, an optical film material and display equipment. The polymer composition comprises a first polymerizable monomer, a second polymerizable monomer and a film-forming resin. The first polymerizable monomer is a non-liquid crystal monomer; the second polymerizable monomer is a liquid crystal monomer, the second polymerizable monomer comprises an active group, and the second polymerizable monomer can be subjected to a copolymerization reaction with the first polymerizable monomer through the active group under illumination. The refractive index modulation degree of the optical film material can be improved by using the polymer composition.

The invention relates to the technical field of holographic gratings, in particular to a holographic grating with a high refractive index modulation degree and a preparation method thereof, and the preparation method comprises the steps: coating a grating substrate with a precursor material to form a coating, and preparing a holographic dry plate with a holographic material layer; performing interference exposure on the holographic plate to obtain a semi-finished grating; bleaching the semi-finished product grating, and soaking the semi-finished product grating in an extraction liquid to obtain a grating precursor with a groove; and filling the groove with a fluorine-containing polymer dopant to obtain the holographic grating. The part, corresponding to the exposure bright area, of the grating precursor with the grooves is a polymer with a high refractive index, the inert body in the exposure dark area is removed, air is left, the grooves are formed in the surface of the grating, the appearance of the grooves fluctuates, the grooves are filled with low-refractive-index substances, and finally the high-refractive-index substances in the bright area are formed. The dark area is of a grating structure made of a low-refractive-index material; by adopting a two-step processing method, the holographic grating without light leakage in the reverse direction can be manufactured.

The invention discloses an optical monomer, a holographic recording medium, a preparation method and a related device, the structural general formula of the optical monomer is as shown in G1-G6, the monomer is high in refractive index, the preparation method is simple, and further, the optical monomer with the structure is introduced into the photopolymer type holographic recording medium, so that the photopolymer type holographic recording medium is prepared. The invention further provides a preparation method of the holographic recording medium, a volume holographic grating containing the holographic recording medium, a holographic optical element containing the holographic recording medium and an optical device containing the holographic recording medium.

Provided in the present application are an exposure parameter determination method and apparatus for a volume holographic grating, and a two-dimensional exit pupil expansion volume holographic optical waveguide. The method comprises: when the wavelengths of a first light beam and a second light beam are a first recording wavelength, rotating a vector of the first light beam, a vector of the second light beam, and a holographic photosensitive material multiple times, so as to obtain rotated vectors of the first light beam and the second light beam, and a rotated material position of the holographic photosensitive material; shifting the wavelengths of the first light beam and the second light beam to a second recording wavelength, and rotating at least once the rotated vectors of the first light beam and the second light beam, so as to obtain in-material vectors of the first light beam and the second light beam; on the basis of the in-material vectors of the first light beam and the second light beam, determining in-air vectors of the first light beam and the second light beam; and on the basis of the in-air vectors of the first light beam and the second light beam, determining the incident angles of the first light beam and the second light beam. The method can improve the manufacturing efficiency of a two-dimensional exit pupil expansion volume holographic optical waveguide including coupling-in, turning and coupling-out volume holographic gratings.

The invention discloses a simulation method and device of an AR optical system, a medium and electronic equipment, and the method comprises the steps: obtaining an initial source file, converting the initial source file into a target file based on a Kogelnik coupling wave theory and a preset volume holographic grating structure requirement, and importing the target file into ZEMAX; acquiring a corresponding luminous source according to preset parameters of the display; obtaining an initial collimation component, converting the initial collimation component into a target collimation component, and importing the target collimation component into the ZEMAX; in a non-sequence mode of ZEMAX, calling a target file, generating a volume holographic grating, and obtaining a holographic waveguide assembly; and connecting the light emitting source, the target collimation assembly, the holographic waveguide assembly and a preset detector to obtain the target AR optical system. Compared with the prior art, simulation of the holographic waveguide assembly and simulation of the integrity of the AR optical system can be achieved, the simulation efficiency is improved, the systematicness, integrity and quality of simulation are improved, and then the optical performance of the optical system in AR equipment is improved.

This application discloses a holographic material and its preparation method, a holographic optical element, a holographic device, and a method for preparing a volume holographic grating. The method for preparing the holographic material includes: providing a blocked polyisocyanate, a first compound, a polymerizable monomer, a photoinitiator, and other additives; and mixing the blocked polyisocyanate, the first compound, the polymerizable monomer, the photoinitiator, and the other additives uniformly under light-protected conditions to obtain the holographic material. This method allows for the pre-mixing and long-term storage of second-order holographic materials, control of first-order reactions, and improvement of the overall volume holographic grating preparation process.

The present application relates to the technical field of measurement, in particular to a kind of spectrometer automatic calibration device and method, comprising: light source, optical isolator, fiber coupler, standard reference light source, adjustable fiber attenuator, first fiber collimator, holographic frequency selection module, electric reflector, volume holographic grating, second fiber collimator, beam splitter, optical interface unit, to be measured spectrometer, photoelectric detector, electric reflector driver, angle-second level angle encoder, control module, communication module, computer and image display unit.The present application utilizes volume holographic grating to select the corresponding relationship between the pixel of spectrometer and wavelength, can continuously select monochromatic light, and the theoretical resolution is consistent with the spectral resolution of light source;Using automatic calibration method, the automatic calibration of spectrometer is realized, pixel-wavelength calibration data can be automatically generated and stored in preset format, which is convenient for automatic calibration and data processing of spectral measurement software, and realizes wavelength-pixel position registration at pixel level.

An LCoS-based compact single-layer full-color AR optical waveguide, comprising an LCoS optical engine (1), a parallel plate (2), a coupling-in graded-period polarization volume lens (3) and a two-dimensional coupling-out polarization volume grating (4), wherein the LCoS optical engine (1) is connected to the parallel plate (2) by means of optical bonding; the coupling-in graded-period polarization volume lens (3) achieves the effects of light collimation and light defection and coupling, and undergoes graded-period processing to extend the wavelength bandwidth thereof to a visible light range; and the two-dimensional coupling-out polarization volume grating (4) is used for expanding light in two directions, thereby achieving a pupil expansion effect. The full-color AR optical waveguide solves the problem of an LCoS optical engine being excessively large due to the reliance on a projection lens, thereby enabling the implementation of a compact single-layer full-color AR optical waveguide.

The invention discloses a non-contact measuring head device and a measuring method for a nanometer coordinate measuring machine, and the measuring head device comprises a laser holographic measuring module, an optical microscopic imaging module and a signal processing module. The laser holographic measurement module comprises a semiconductor laser, a straight stripe grating close to the semiconductor laser, a holographic grating far away from the semiconductor laser, a first photoelectric detector, a second photoelectric detector, a first lens, a second lens, a first spectroscope and a microscope objective, wherein the first photoelectric detector and the second photoelectric detector are located on the left side and the right side of the semiconductor laser respectively. The signal processing module calculates out-of-focus error signals according to the electric signals obtained by the laser holography measurement module, calculates out-of-focus amount of each measurement point on the surface of the sample according to the linear relation between the out-of-focus amount of the surface of the measured sample leaving the focal plane of the microscope objective and the out-of-focus error signals, and calculates out-of-focus amount of each measurement point on the surface of the sample according to coordinate values of the nanometer coordinate measurement machine. And obtaining the coordinate value of each measuring point on the surface of the sample. According to the invention, the aiming resolution can be improved, and high-precision and high-resolution three-dimensional measurement is realized.

The invention discloses a photopolymer material, application thereof and a volume holographic grating, and relates to the technical field of polymer photosensitive materials. The photopolymer material comprises the following raw materials: a binder, an active monomer, a photoinitiator, a photosensitizer, a hydrogen donor and a sensitizer, the molar ratio of the active monomer to the photoinitiator is (8-12): 1; the molar ratio of the photosensitizer to the photoinitiator is 1: (15-25); the active monomer comprises a high-refractive-index monomer with the refractive index of 1.55-1.72 and a low-refractive-index monomer with the refractive index of 1.44-1.50, and the molar ratio of the high-refractive-index monomer to the low-refractive-index monomer is (0.7-1.3): 1. The photopolymer material meeting holographic recording can be prepared, and the prepared material is good in heat resistance, rapid in film forming, short in oxygen isolation exposure response time (as long as several seconds), high in refractive index modulation degree, high in sensitivity, high in diffraction efficiency, good in mechanical property and high in transmittance and can be prepared in a large area.

A holographic recording medium. By means of introducing sulfur atoms and aromatic ring groups having high molar refractivity, the structure of an active monomer is modified such that the refractive index of the active monomer is raised to increase the overall refractive index difference, thereby preparing a high-performance volume holographic grating.

This invention relates to the field of combustion diagnostic technology, specifically to a combustion diagnostic method and system based on a vector light field. The system includes a spectrometer and, sequentially arranged components: a femtosecond laser, a beam-expanding lens group, a spatial light modulator, a first lens, a filter, a quarter-wave plate, a second lens, a Rochi grating, a third lens, and an imaging unit. The spatial light modulator, first lens, second lens, and Rochi grating form a 4f optical system. The spatial light modulator is used to load a holographic grating to phase-modulate the expanded femtosecond laser beam, thereby forming a vector light field. The filter is used to filter out the ±1st order diffraction light of the femtosecond laser modulated by the spatial light modulator. The imaging unit is used to acquire images of the optical filament, and the spectrometer is used to acquire the spectral signal of the interaction between the optical filament and the combustible material, thereby achieving combustion diagnosis. This invention forms the optical filament based on a vector light field, improving the stability of the optical filament and providing a foundation for improving the accuracy of combustion diagnosis.

The application provides a polarization volume holographic grating, a preparation method of the polarization volume holographic grating and an exposure system, and the polarization volume holographic grating comprises a substrate layer, a two-dimensional orientation layer and a liquid crystal layer; the two-dimensional orientation layer is arranged on the surface of the substrate layer, the orientation direction of the two-dimensional orientation layer periodically changes in a first preset direction and periodically changes in a second preset direction perpendicular to the first preset direction, so that the two-dimensional orientation layer forms first and second equal phase lines with an included angle greater than zero; the liquid crystal layer is arranged on the surface of the two-dimensional orientation layer away from the substrate layer, the arrangement direction of the liquid crystal molecules in the liquid crystal layer corresponds to the orientation direction of the two-dimensional orientation layer, so that the liquid crystal layer forms a first equal phase surface corresponding to the first equal phase line and a second equal phase surface corresponding to the second equal phase line. The application orients the liquid crystal layer through the two-dimensional orientation layer, so that the polarization volume holographic grating has the diffraction characteristics of a two-dimensional grating, and the preparation of a single-layer two-dimensional polarization volume holographic grating is realized.

The invention relates to a photocuring glue solution for a volume holographic grating base material as well as a preparation method and application of the photocuring glue solution. The photocuring glue solution for the volume holographic grating base material comprises the following components in percentage by mass: 10%-55% of UV release resin, 0.01%-2% of a photoinitiator, 5%-40% of monofunctional acrylate and 10%-50% of polyfunctional acrylate. The volume holographic grating base material provided by the invention is coated on a substrate such as glass or plastic by using a photocuring glue solution, so that the surface roughness of the substrate can be greatly reduced, the volume holographic grating base material with low surface roughness can be obtained, and the manufacturing cost of the volume holographic grating base material can be greatly reduced; the volume holographic grating prepared on the volume holographic grating base material also has transferability.

This invention provides a photopolymer composition, a holographic film, and a volume holographic grating. The photopolymer composition of this invention comprises a polymer matrix, a photopolymerizable monomer, and a photoinitiator; the polymer matrix comprises linear polyurethane, and the photopolymerizable monomer comprises a compound represented by Formula I. By using linear polyurethane as the polyurethane matrix and a compound represented by Formula I as the photopolymerizable monomer, the photopolymer composition of this invention possesses high refractive index modulation capability and low viscosity, enabling the formation of a holographic film with uniform material distribution, thereby achieving high diffraction efficiency in the volume holographic grating.

The utility model discloses a holographic light booth structure, including support assembly, the sliding partition board assembly of multiple groups of sliding setting in the side wall of support assembly edge department and the upper seal plate of lap joint in the top of support assembly, support assembly includes at least six support beams that are along Y axle and are in rectangularly closed setting on optical platform, the first splicing beam of multiple roots that lap joint in the top and bottom of six support beams respectively along X axle and the second splicing beam of multiple roots that lap joint in the top and bottom of six support beams respectively along Z axle, and can be based on optical platform construction initial support assembly to realize the package of optical platform to support beam, first splicing beam and third splicing beam, after based on the assembly sliding partition board assembly of support assembly edge department, and set up the upper seal plate on the top, and finally form the rectangular fairing of erection on the optical platform surface, realize the closed light path, avoid the influence of air current disturbance to the process result, improved the stability of holographic grating in exposure operation.

This application discloses a display device. The display device includes: an optical waveguide substrate, the optical waveguide substrate including a light-emitting surface and a light-incident surface disposed on one side of the light-emitting surface; a light source disposed on the light-incident surface of the optical waveguide substrate; and a grating structure, the grating structure including: a first transparent electrode layer disposed on the light-emitting surface of the optical waveguide; a first holographic grating layer covering the first transparent electrode layer; and a second transparent electrode layer disposed on the first holographic grating layer and disposed opposite to the first transparent electrode layer. This application aims to solve the problem that the structure of existing display devices is complex and difficult to achieve in a thinner and lighter form factor.

The invention discloses a spectrometer optical path structure based on photoacoustic composite film thickness detection, a mechanical device and an adjustment method thereof, and relates to the technical field of optical coherence tomography. The light path structure comprises a collimating lens group used for collimating an incident light beam into parallel light; the reflecting element is obliquely arranged and is used for reflecting the collimated light beam; and the grating element is used for splitting the reflected light beam. An achromatic collimating lens group, a high-diffraction-efficiency body phase holographic grating and a glass material with an extremely low dispersion coefficient are used as focusing lenses to build a light path structure, through precise optical design, the RMS radius of a light spot with a single wavelength is optimized to be close to a diffraction limit, more than 95% of light energy is concentrated in a tiny area, and the light path structure is optimized to be uniform. The extremely high energy concentration ratio effectively reduces the requirement for the pixel size of the camera, the overall signal-to-noise ratio and spectral resolution of the system are remarkably improved, and the inherent disadvantages that an infrared indium gallium arsenic camera is small in pixel and low in signal-to-noise ratio are successfully overcome.

The present disclosure relates to the technical field of holographic optical waveguide, and provides a holographic grating preparation system and a preparation method. The holographic grating preparation system comprises: a laser light source for generating a laser beam; a polarization light splitting component for splitting the laser beam into two beams and adjusting the light intensity and the beam polarization direction of the split laser beams, so that the polarization directions of the two split laser beams are perpendicular to the horizontal plane and parallel to the rotation axis of the mirror; a mirror group for mirror reflecting the split laser beams output by the polarization light splitting component to form two intersecting laser beams with a set angle, and the set angle is adjusted according to the rotation angle of the mirror group; and a recording medium for receiving the two intersecting laser beams, recording the interference fringes of the two intersecting laser beams through the refractive index and / or transmittance changes varying with the two intersecting laser beams, and forming a holographic grating.

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.