439 results about "Diffraction optics" patented technology

The invention relates to the technical field of image processing, and discloses an image correction method and system for binocular diffraction AR intelligent glasses. The method comprises the following steps: calculating a dispersion response parameter of a diffractive optical element in the AR glasses in a visible light wave band; respectively carrying out dispersion distortion detection on the left eye image and the right eye image in the AR glasses to obtain a left eye dispersion distortion feature and a right eye dispersion distortion feature; interpupillary distance change data of a user is obtained, effective aperture offset calculation is carried out on the diffractive optical element, and interpupillary distance compensation parameters are obtained; performing coupling calculation on the left eye dispersion distortion feature, the right eye dispersion distortion feature and the interpupillary distance compensation parameter to obtain a binocular dispersion correction matrix; and performing dispersion compensation on the left eye image and the right eye image to obtain a dispersion correction image, and outputting the dispersion correction image to a display module of the AR glasses. The method can respond to the pupil distance change of the user in real time, automatically adjust dispersion correction parameters, realize accurate and comprehensive dispersion correction, and ensure the stability of dispersion correction performance.

The invention relates to the technical field of laser welding, and provides a high-speed laser welding wire box process based on multi-beam synergy, which comprises the following steps: step 1, at least three laser beams are adopted as a synergy composite heat source, a main laser beam is responsible for penetration fusion welding, and an auxiliary laser beam is responsible for preheating, post-heating or molten pool stabilization; when the copper-aluminum dissimilar material is welded, an auxiliary laser beam is switched into a green laser; and 2, assembling a multi-beam optical regulation and control unit comprising a diffractive optical element, a quartz field lens and a galvanometer scanning module, splitting a main beam into one main beam and two auxiliary beams through the diffractive optical element, controlling focal depth fluctuation by the quartz field lens, and realizing accurate movement positioning of a laser beam by the galvanometer scanning module. Through integration of multi-beam collaborative design and an intelligent control unit, remarkable breakthroughs are achieved in the aspects of welding efficiency, quality consistency and process adaptability, firstly, in the aspect of efficiency and process, the welding speed is greatly increased, multi-station synchronous operation of an automatic welding unit is matched, and the welding period of a single-line box is remarkably shortened.

The invention relates to the technical field of laser beam shaping, discloses an active test method and system for a circuit breaker, and is used for solving the problem that the self-adaptive shaping capability of a CO2 laser beam is difficult to improve by the existing method. Firstly, a stable light path is constructed, and the stability of the light path is ensured through mechanical limiting, a thermal management module and multi-stage optical alignment; then low-power calibration is carried out, a deformable mirror initial driving table is generated through a least square inversion algorithm, and a flat-topped beam reference is established; data are collected through a wavefront sensor, a high-order mode is reconstructed, the voltage of a deformable mirror is dynamically refreshed, and wavefront control and scanning motion synchronization is ensured in combination with scanning galvanometer time sequence synchronization, closed-loop control and exception handling; monitoring the temperature of the deformable mirror, starting water-cooling adjustment, and correcting the driving table to cope with the heat effect; finally, a safety system is constructed, laser power, wavefront distortion and deformable mirror stroke parameters are monitored, dry gas purging is conducted on the diffractive optical element regularly, and safety guarantee and performance verification of the whole process are achieved.

A beamsplitter can include a first surface with a diffractive optical element, a second surface normal to the first surface, and a beam splitting surface arranged at an angle to the second surface that is less than 45 degrees. The beamsplitter may be configured to illuminate the entire second surface in response to an input beam at the first surface.

The invention discloses a light spot adjustable optical system, a diffraction optical module and laser processing equipment, and relates to the technical field of precision processing. The optical system comprises a laser, a beam expander, a diffractive optical module and a focusing module which are sequentially arranged in the light path direction, the diffractive optical module comprises at least one diffractive optical element, and the diffractive optical element is manufactured based on a geometric phase liquid crystal polymer birefringent material. The diffractive optical module is used for regulating and controlling light spot characteristic parameters corresponding to a Gaussian beam, the Gaussian beam is emitted by the laser and enters the diffractive optical module after being expanded and collimated by the beam expander, and the light spot characteristic parameters comprise a light spot distribution position and light spot energy intensity. By the adoption of the optical system, laser energy distribution can be optimized, splashing is effectively restrained, and the welding quality and the processing efficiency are improved.

The eyepiece waveguide stack includes a first eyepiece waveguide including a first incoupling diffractive optical element and a first compound pupil dilator, and a second eyepiece waveguide including a second incoupling diffractive optical element and a second compound pupil dilator, the second incoupling diffractive optical element being laterally offset from the first incoupling diffractive optical element.

The embodiment of the invention provides a diffractive optical structure and near-to-eye display equipment. The diffractive optical structure comprises a waveguide substrate and a grating area and a non-grating area which are arranged on the waveguide substrate, a grating structure is formed in the grating area, a dielectric layer covers the non-grating area, and the refractive indexes of the grating structure and the dielectric layer are n1; a pre-compensation structure is arranged in at least part of areas, corresponding to the multiple grating structures and / or the multiple non-grating areas, on the waveguide substrate, the pre-compensation structure is a concave structure which is formed in the thickness direction of the waveguide substrate and has a specific depth, and the concave depth hi of the pre-compensation structure meets the condition that hi is smaller than di * (n1 / n2), wherein di is the grating depth of the grating structure or the thickness of the dielectric layer at the position corresponding to the pre-compensation structure, i is the number of the grating area or the non-grating area, and i is a positive integer greater than or equal to 1; n2 is the refractive index of the waveguide substrate.

An apparatus includes: first and second light guides, each light guide respectively including: a plurality of diffractive optical elements configured to: in-couple one or more input beams of light into the light guides, expand the input beams of light, and out-couple the expanded beams of light from the light guides to provide expanded output light beams; wherein the out-coupling diffractive optical elements include a plurality of sections thereof that are independently switchable between first and second out-coupling states. A section of the out-coupling diffractive guide in the first out-coupling state permits the out-coupling of the expanded beams of light therefrom. A section of the out-coupling diffractive guide in the second out-coupling state precludes the out-coupling of the expanded beams of light therefrom. The out-coupling diffractive guides at least partially overlap.

The application relates to a kind of diffractive optical element beam shaping methods based on spatial frequency filtering, obtain incident light beam, based on the homogenization light beam of preset, obtain corresponding geometric analytical phase distribution;Adjust the homogenization light beam to rectangular flat-top light beam, the phase correction processing of obtained geometric analytical phase;Based on spatial frequency filtering method processing the geometric analytical phase after phase correction, get the light field regulation and control distribution requirement after processing, the light field regulation and control distribution requirement after processing has phase and amplitude regulation and control requirement simultaneously;Design diffractive optical element, make it realize the light field regulation and control distribution requirement required, and utilize the diffractive optical element to realize the incident light beam shaping as the rectangular flat-top light beam.The application can realize the light beam homogenization effect of high uniformity, edge sharp and high diffraction efficiency, and obtain wide application prospect in laser welding, photoetching and biomedical and other aspects.

The embodiment of the invention provides a diffractive optical structure and near-to-eye display equipment. The diffractive optical structure comprises a waveguide substrate, a grating area and a non-grating area, the grating area and the non-grating area are arranged on the waveguide substrate, a grating structure is formed in the grating area, the non-grating area is covered with a dielectric layer, and the refractive index of the grating structure and the refractive index of the dielectric layer are both n1; in the areas, corresponding to the multiple grating structures and / or the multiple non-grating areas, on the waveguide substrate, at least part of the areas are provided with compensation thin film layers; the thickness Ti of the compensation thin film layer satisfies Ti < di * (n1 / n2), and di is the grating depth of the grating structure at the position corresponding to the compensation thin film layer or the thickness of the dielectric layer; n2 is the refractive index of the compensation film layer; the compensation thin film layer is configured to compensate reflection phase difference caused by structural difference between the grating area and the non-grating area when light is propagated in the waveguide substrate in a total reflection mode, and the absolute value of the reflection phase difference does not exceed a preset threshold value.

The present disclosure relates to devices, systems and / or methods for myopia control. The present disclosure generally relates to a lens that provides a stop signal for myopia on a substantial portion of the spectacle lens being used by a viewer. The present disclosure relates to devices, methods and / or systems for applying a stop signal for eye development using ophthalmic lenses in combination with microlens arrays. The present disclosure also relates to devices, methods and / or systems for modifying incident light through spectacle lenses that utilize color cues to slow down the rate of myopia progression. The present disclosure relates to devices, methods and / or systems for applying a stop signal for eye development using spectacle lenses in combination with refractive and / or diffractive optical elements that provide conflicting or opposition optical signals at wavelengths between 510 nm and 610 nm.

A time-lapse image classification device and method is disclosed that uses a diffractive optical network to classify an optical input, significantly advancing classification accuracy and generalization performance on complex input objects by using the lateral movements of the input objects and / or the diffractive optical network relative to each other. The design space and performance limits of time-lapse diffractive optical networks were numerically tested, revealing a blind testing accuracy of 62.03% on the optical classification of objects from the CIFAR-10 dataset. This constitutes the highest inference accuracy achieved so far using a single diffractive optical network on the CIFAR-10 dataset. Time-lapse diffractive optical networks will be broadly useful for the spatio-temporal analysis of input signals using all-optical processors.

The invention discloses a stray light removing system of a diffractive optical element for beam splitting, which comprises a laser light source, the diffractive optical element for beam splitting, a first focusing element, a diaphragm, a second focusing element and a third focusing element which are sequentially arranged along the direction of a laser light path, and is characterized in that the diffractive optical element is used for splitting incident light into a plurality of sub-beams; a plurality of light through holes used for removing stray light are formed in the diaphragm corresponding to the plurality of sub light beams, the focal lengths of the first focusing element and the second focusing element are the same and are F, the distance between the diaphragm and the first focusing element and the distance between the diaphragm and the second focusing element are the same and are L, and L is equal to F. By forming a 4f filtering system, stray light of each sub light beam is effectively removed, and under the condition that the transmission characteristic of light is not changed, the whole structure is simple, operation is convenient, the yield of machined products is guaranteed, and cost is saved.

The embodiment of the invention provides a diffractive optical structure and near-to-eye display equipment. Wherein the diffractive optical structure comprises a waveguide substrate, a plurality of grating areas and a plurality of non-grating areas, the grating areas and the non-grating areas are arranged on the waveguide substrate, and grating structures are formed in the grating areas; wherein a small-period grating structure is formed in at least part of the area, corresponding to the multiple grating structures and / or the multiple non-grating areas, on the waveguide substrate, and the grating period of the small-period grating structure is smaller than that of the grating structure; the small-period grating structure is configured to compensate reflection phase difference caused by structural difference between the grating area and the non-grating area when light is totally reflected and propagated in the waveguide substrate, and the absolute value of the reflection phase difference does not exceed a preset threshold value.

The invention is suitable for the technical field of diffractive optics, and provides a self-adaptive chromatography grating dispersion correction method and system based on deep learning, and the method comprises the following steps: enabling an incident light beam to be diffracted through a chromatography grating, and obtaining a multi-stage chromatography diffraction light beam; dispersion angle compensation is carried out on the multi-stage diffraction beams through the plane straight stripe blazed grating; collimating the corrected light beam by using a double-barrel lens group and forming an image space telecentric light path to obtain an image space telecentric light beam; performing spectral beam splitting and aberration pre-correction on an image space telecentric beam through a micro-lens array, and then performing image acquisition to obtain a pre-corrected multi-spectral image; and based on a deep learning algorithm, carrying out real-time fusion processing on the pre-corrected multispectral image, dynamically adjusting the deflection angle of the microlens array, and outputting a chromatic dispersion corrected tomographic microscopic image. According to the method, the axial color difference and the transverse color difference of the chromatography system can be remarkably reduced, and the method is particularly suitable for application scenes needing wide spectrum coverage and high signal-to-noise ratio.

The invention discloses a rapid biological cell classification imaging method and system based on a quantum correlation diffraction optical neural network, and the method comprises the steps: regulating and controlling a signal photon to an orbital angular momentum state optimized by a neural network based on a time-energy correlation two-photon pair generated in a spontaneous parametric down-conversion process, and irradiating a biological cell sample; a diffractive optical neural network is utilized to construct a quantum state illumination diffractive optical processor, photons carrying cell complex amplitude information are mapped to different detection areas of a predefined image plane, and rapid and high-precision cell classification and recognition are realized through correlation imaging results of an enhanced charge coupled camera. The method has the signal-to-noise ratio and anti-interference capability exceeding the classic limit, can keep high-precision cell classification capability under high background noise, and is suitable for long-time monitoring of living cells under the condition of extremely low light intensity. The method has the characteristics of low energy consumption and high efficiency, and meets the requirements of green calculation and sustainable development. And the method can be used for rapidly classifying and identifying the living biological cells without marks and phototoxicity.

To provide a diffraction optical element that has high optical performance despite its ease of manufacture.SOLUTION: A diffraction optical element (1) comprises a first diffraction grating (8) formed of a first material, a second diffraction grating (9) formed of a second material, and thin-film layers (10a, 10b). The first diffraction grating and the second diffraction grating are closely adhered to each other with the thin-film layers therebetween. The diffraction optical element has a plurality of orbicular zone areas different from each other in the arrangement pitch of orbicular zones in a radial direction. When the minimum value of the arrangement pitch is defined as P (μm), and for at least one orbicular zone of the plurality of orbicular zones, when the refractive index in the design wavelength of the first diffraction grating and the refractive index in the design wavelength of the second diffraction grating are defined as N1 and N2, respectively, the refractive index in the design wavelength of the thin-film layers as Nf, and the maximum value of the thickness of the thin-film layers as df (nm), conditional expressions of 0.4<|N1-N2|×P<6.0 and 0≤|N1+N2-2×Nf|×df<40 are satisfied.SELECTED DRAWING: Figure 2

A method and apparatus for inscribing a high-temperature stable Bragg grating in an optical waveguide, comprising the steps of: providing the optical waveguide; providing electromagnetic radiation from an ultrashort pulse duration laser, wherein the wavelength of the electromagnetic radiation has a characteristic wavelength in the wavelength range from 150 nanometers (nm) to 2.0 micrometers (μm); providing cylindrical focusing optics; providing a diffractive optical element that when exposed to the focused ultrashort laser pulse, creates an interference pattern on the optical waveguide, wherein the irradiation step comprises irradiating a surface of the diffractive optical element with the focused electromagnetic radiation, the electromagnetic radiation incident on the optical waveguide, from the diffractive optical element, being sufficiently intensive to cause permanent (Type II) change in the index of refraction within multiple Bragg grating planes in the core of the optical waveguide resulting from at least one micropore.

In some embodiments, a near-eye, near-eye display system comprises a stack of waveguides having pillars in a central, active portion of the waveguides. The active portion may include light outcoupling optical elements configured to outcouple image light from the waveguides towards the eye of a viewer. The pillars extend between and separate neighboring ones of the waveguides. The light outcoupling optical elements may include diffractive optical elements that are formed simultaneously with the pillars, for example, by imprinting or casting. The pillars are disposed on one or more major surfaces of each of the waveguides. The pillars may define a distance between two adjacent waveguides of the stack of waveguides. The pillars may be bonded to adjacent waveguides may be using one or more of the systems, methods, or devices herein. The bonding provides a high level of thermal stability to the waveguide stack, to resist deformation as temperatures change.

To provide a technique capable of reducing the influence of the variation in the thickness of a resin cured material layer having projecting parts for developing diffraction action on the light utilization efficiency of a diffraction optical element.SOLUTION: The diffractive optical element 10 is used for at least one of division and shaping of a laser beam having a wavelength in a near-infrared region, and includes a substrate 11 that transmits the laser beam, and a cured resin layer 12 that is provided on the substrate 11 and transmits the laser beam, the cured resin layer 12 having a refractive index of 1.6 or less at a wavelength of 9400 nm, and generating a plurality of convex portions 12P that exhibit a diffractive action on a surface of the diffractive optical element 10, each of the plurality of convex portions 12P having a height H in a range of 1.4 μm or more and 1.7 μm or less, the width W is in a range of 0.4 μm or more and 1.0 μm or less.SELECTED DRAWING: Figure 1

The invention relates to a reflective AR diffractive optical waveguide lens, which comprises a waveguide substrate, an input diffractive optical element, an output diffractive optical element, a low refractive index filling layer, a sub-wavelength diffractive microstructure and / or a diffractive optical film, and is characterized in that the input diffractive optical element couples a light beam into the waveguide substrate; coupled light beams are totally reflected in the waveguide substrate and then are coupled out by the output diffractive optical element step by step, the low-refractive filling layer is embedded in a grating gap between the input diffractive optical element and the output diffractive optical element, and the height of the low-refractive filling layer exceeds that of the input diffractive optical element and the output diffractive optical element. And the sub-wavelength diffraction microstructure and / or the diffraction optical film are / is arranged on the low-refractive-index filling layer and are / is arranged opposite to the output diffraction optical element. According to the invention, an air capping plate layer for protecting a grating in an AR lens is replaced, the size of the lens is reduced, and the sub-wavelength diffraction microstructure and / or the diffraction optical film on the low-refraction filling layer can solve the problems of rainbow lines, light leakage, transmittance and the like caused by diffraction optical waveguides on the basis of not influencing the optical performance.

The slit lamp comprises a shell, a light source assembly, a slit assembly, an optical filter assembly, a diffractive optical element and a reflector assembly, wherein the light source assembly, the slit assembly, the optical filter assembly, the diffractive optical element and the reflector assembly are installed in the shell. Wherein the optical filter assembly comprises a plurality of optical filters and a driving unit, and the driving unit is used for driving one optical filter to move into an optical path; the reflecting mirror assembly comprises a reflecting mirror and a reflecting mirror seat, and the reflecting mirror seat is rotationally connected with the shell; according to the slit lamp, the rotatable optical filter and the diffractive optical element are arranged, so that the slit effect is slender, a better lighting effect is achieved, and the accuracy of an operation is improved.

The invention relates to a projection unit (110) for projecting a test pattern (140). Using the test pattern (140), the sharpness properties of an optical test object (X) can be tested. The projection unit (110) comprises a diffractive optical element shaped to generate a plurality of virtual test objects (142, 143) as the test pattern (140) in response to different excitation light (125, 135) coupled into the projection unit (110) simultaneously from one or more light sources (120, 130). Different of the test objects (142, 143) are arranged in different focal planes and at different solid angles from the perspective of the test object (X).

The invention discloses projection equipment, which is characterized in that a diffractive optical element is arranged on the light emitting side of a light combining assembly, is separated from the light combining assembly by a set distance, is provided with a plurality of subareas, corresponds to laser of one color and moves according to the color of the laser emitted by a laser light source, so that the color of the laser emitted by the diffractive optical element is changed; different colors of laser emitted by a laser light source are respectively incident to corresponding partitions of a diffractive optical element, and each partition collimates the incident laser beam of the corresponding color, so that the diffractive optical element collimates the different colors of laser emitted by the laser and then irradiates the phase modulation device according to different time sequences. The efficiency of collimating laser beams of various colors by the diffractive optical element is improved, and the projection display effect is further improved.

A head-mounted, near-eye display system comprises a stack of waveguides having integral spacers separating the waveguides. The waveguides may each include diffractive optical elements that are formed simultaneously with the spacers by imprinting or casting. The spacers are disposed on one or more major surfaces of the waveguides and define a distance between immediately adjacent waveguides. Adjacent waveguides may be bonded using adhesives on the spacers. The spacers may fit within indentations of overlying waveguides. In some cases, the spacers may form one or more walls of material substantially around a perimeter of an associated waveguide. Vent holes may be provided in the walls to allow gas flow into and out from an interior volume defined by the spacers. Debris trapping structures may be provided between two walls of spacers to trap and prevent debris from entering into the interior volume.

Provided is a thin diffraction optical element that can be mass-produced and has high light condensing performance that can cope with a fine pixel pitch, and a method for manufacturing the diffraction optical element. A diffraction optical element that diffracts incident light in a wavelength range of 410 nm to 1,100 nm, and includes: a substrate that transmits the incident light; and a light-blocking resin layer that forms a concave-convex on a main surface of the substrate, and forms a diffraction pattern that is substantially concentric when viewed in a direction orthogonal to the main surface of the substrate, and is formed of a hardenable resin composition and blocks at least some wavelengths of the incident light.

The invention is suitable for the technical field of diffractive optics, and provides an intelligent analysis method and system for multispectral microscopic imaging, and the method comprises the following steps: obtaining the three-dimensional structure information of a sample through the light splitting of a chromatography grating; inputting the three-dimensional structure information into a lightweight convolutional neural network model, and automatically optimizing a defocus compensation parameter and an optical filter transmission spectrum of the double telecentric lens group; inputting the optimized tomographic images into an image segmentation neural network model, automatically identifying feature regions in each tomographic image, and performing selective wavefront optimization; carrying out dispersion light splitting on each diffraction order light beam subjected to wavefront optimization, and synchronously collecting multispectral image data of each diffraction order light beam; and inputting the multispectral image data into the spectrum analysis neural network model, and outputting a three-dimensional spectrum cube of the sample. The method provided by the invention can provide richer information sources for subsequent sample component analysis, is particularly suitable for detecting characteristic components of pathological cells, and provides a new analysis means for cell biology research.

The invention discloses a synchronous vision optical lens. A circular pupil of the synchronous vision optical lens is divided into a long-distance vision sector and at least one short-distance vision sector; the long-distance vision sector is used for providing long-distance diopter required by long-distance vision; each of the close-range vision sectors is used to provide at least one close-range diopter required for mid-range or close-range vision. The remote diopter is generated by refractive optics, and the additional diopter is generated by refractive optics or diffractive optics. The short-distance diopters are higher than the long-distance diopters; and each short-distance vision sector corresponds to different short-line-of-sight diopters of a single focus. The diopters of the pupil sectors are mutually independent, so that the design requirements of vision at different distances are met, any different focal length combinations are supported, and the requirements of different visual effects of the synchronous visual intraocular lens are met. The long-distance diopter can also be generated by refraction and diffraction mixed optics, and the diffraction part of the long-distance focal power aims to reduce axial chromatic aberration.

The application discloses a kind of multi-beam confocal mask defect detection system and method based on fiber laser array, the present application obtains multi-point scanning light field as illumination light source based on fiber laser array, and can be based on the arrangement of laser array Realize the regulation and control of scanning light field, through the joint action of motion platform and multi-surface rotating mirror, realize fast and accurate mask two-dimensional scanning imaging, and based on confocal microscopic imaging method, with high-power microscope objective and photomultiplier tube Realize high-resolution detection of mask defect.Compared with the traditional point scanning type mask defect detection system, the present application has the advantages of high detection resolution, fast scanning speed, multi-point scanning light field can be freely regulated and controlled, and does not need to introduce additional diffractive optical element.

The invention discloses an optical waveguide device, a preparation method, an electronic device and electronic equipment, and the optical waveguide device comprises a waveguide, a coupling-out grating and a dielectric layer. The coupling-out grating is used for emitting light and comprises a plurality of diffractive optical structures, the diffractive optical structures are obliquely arranged on the waveguide, and a groove is formed between every two adjacent diffractive optical structures and the waveguide. At least part of the material of the dielectric layer is filled in the groove, at least part of the material of the dielectric layer coats the surface of one side, far away from the waveguide, of the diffractive optical structure, and the surface of one side, far away from the waveguide, of the dielectric layer is a plane. The refractive index of the dielectric layer is smaller than that of the coupling-out grating. In the application, the dielectric layer formed on the coupling-out grating through a coating process can fully fill the grooves among the plurality of diffractive optical structures, a film layer with a certain thickness can also be formed on one side, far away from the waveguide, of the coupling-out grating, the surface of one side, far away from the waveguide, of the film layer forms a plane, and the plane does not have a recess, so that the surface of the coupling-out grating is not damaged. Therefore, the influence of the recess on the light leakage eliminating effect can be avoided, the generation of non-ideal stray light rays at the recess can also be avoided, the improvement of the lighting effect and the uniformity is facilitated, and the final imaging quality can be ensured.