793 results about "Diffraction optics" patented technology

The invention provides a diffractive optical element design and manufacturing integration method based on gray level laser direct writing photoetching, which comprises the following steps that: a manufacturing simulator and a wave optical simulator are established, and the manufacturing simulator represents the spatial frequency response of an optical system through a low-pass filtering model; a mapping relation between exposure dose and a developing result is established by combining nonlinear response of photoresist, and the wave optical simulator predicts optical performance by utilizing output of the manufacturing simulator and combining a wave optical theory; by setting initial manufacturing parameters and performing iterative optimization, the surface appearance of the photoresist is dynamically adjusted to be close to the target optical performance, the optimization process is combined with an automatic differential technology, a gradient optimization algorithm and a block optimization strategy, and the calculation efficiency is improved; and the optimized parameters are used for processing gray laser direct writing equipment to manufacture the diffractive optical element. The problem of manufacturing deviation caused by the optical proximity effect in the prior art can be solved, and meanwhile the overall performance of the diffraction optical element is remarkably improved.

The invention discloses a virus infection positioning detection method and system based on diffractive optics. The method comprises the following steps: acquiring diffraction fingerprints corresponding to all to-be-detected cells in an imaging area by utilizing a diffraction imaging principle; respectively extracting texture features of each diffraction fingerprint in the imaging area by using a gray level co-occurrence matrix method; the extracted texture features are compared with standard texture features pre-stored in a relation model of cell morphological change and diffraction fingerprints, so that the'cell state 'of each cell to be detected in the imaging area can be obtained, and the virus infection state of each cell in the imaging area can be positioned and identified. The efficient light diffraction spectrum system is used for virus infection detection, and the requirement for professionals and expensive and complex professional field detection equipment is eliminated. The continuous and high-throughput evaluation on the cell condition after virus infection is met, and a foundation is laid for popularization and application of a virus infection instant detection platform.

A kaleidoscopic laser beam projector (KLBP) system that employs a single moving structure to project patterns of sweeping laser beams with diverse sweep directions and emission apertures. The system comprises a collimated light source, a spinning mirror deflector (“spindle / flutter mirror”) at the center, and a stationary kaleidoscopic mirror containing multiple facet mirrors arranged in a concave fashion around the spindle mirror. As the spindle mirror rotates, it directs laser beams in a radially whirling movement toward the facet mirrors, which then subdivide these beams into multiple short strokes and redirect them outward in different directions. Various embodiments include configurations with diffractive optical elements (DOEs) for beam splitting, different kaleidoscopic mirror geometries (hexagonal, octagonal, etc.), and innovative flutter mirror mechanisms that create controlled angular variations during rotation. The system enables a “4×1” configuration that replaces traditional “4×4” systems requiring eight motors and multiple moving structures. The KLBP system offers significant advantages including mechanical simplicity, reduced size and weight, improved energy efficiency, enhanced reliability, cost-effectiveness, and modular configurability. The diverse beam incidence angles enable superior illumination of complex three-dimensional objects for applications in machine vision systems, precision metrology, gap and flushness inspection, and robot-assisted assembly of complex structures.

The present disclosure generally relates to a lens that provides a stop signal for myopia over a substantial portion of a spectacle lens that is being used by a viewer. The present disclosure relates to an apparatus, method, and / or system for applying a stop signal for eye development using a spectacle lens in combination with an array of microlenses. The present disclosure also relates to an apparatus, method, and / or system for modifying incident light through a spectacle lens that utilizes color cues to slow the rate of myopia progression. The present disclosure relates to an apparatus, method, and / or system for applying a stop signal for eye development using a spectacle lens in combination with a refractive optical element and / or a diffractive optical element that provides conflicting or opposing optical signals at wavelengths between 510 nm and 610 nm.

The invention provides an optical calculation method and system based on on-chip diffractive optical feature extraction and a chip. The method comprises the following steps: loading data of an input end to an input optical signal; performing optical domain preprocessing on the input optical signal to obtain a preprocessed optical signal; the preprocessing mode comprises power distribution, time delay, amplitude and phase adjustment; performing feature extraction calculation on the preprocessed optical signal through an on-chip diffraction optical feature extractor to obtain optical feature information which is output in parallel; the optical characteristic information is transmitted to a receiving end. According to the method, feature extraction and preliminary calculation are carried out in the optical domain, the calculation time is greatly shortened, the high-speed requirement can be met, redundant data can be compressed, the speed, bandwidth and efficiency of the whole calculation system are improved, and the severe bottleneck caused by electronic calculation is solved.

According to the multi-beam confocal mask defect detection system and method based on the fiber laser array, a multi-point scanning light field is obtained on the basis of the fiber laser array to serve as an illumination light source, the scanning light field can be regulated and controlled on the basis of arrangement of the laser array, and through the combined action of a motion table and a multi-face rotating mirror, the defect of the multi-beam confocal mask is detected. Rapid and accurate mask two-dimensional scanning imaging is achieved, and high-resolution detection of mask defects is achieved on the basis of a confocal microscopic imaging method in cooperation with a high-power microscope objective and a photomultiplier. Compared with a traditional point scanning type mask defect detection system, the system has the advantages that the detection resolution is high, the scanning speed is high, a multi-point scanning light field can be freely regulated and controlled, and no extra diffraction optical element needs to be introduced.

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 disclosure relates to augmented reality devices based on a curved waveguide. An augmented reality device is provided. The augmented reality device includes a projection system to project an undistorted image, an input optical compensator located on the path of light rays out-coupled from the projection system, a curved waveguide comprising an input diffractive optical element and an output diffractive optical element. The output diffractive optical element performs the function of an output optical compensator that converts the light beams of a distorted image at the output of the waveguide into parallel light beams to output an undistorted image. Augmented reality glasses comprising an augmented reality device are also proposed. There is provided the ability to project a virtual image without aberrations, distortions and doubling of the image.

The invention relates to the technical field of target distance detection and 3D scanning reconstruction, and discloses a coaxial scanning type ultra-long distance detection laser radar system, which comprises a laser light source module, which adopts a 1550nm optical fiber laser to output high-power laser, and ensures sufficient laser energy and human eye safety; according to the invention, by adopting the high-power 1550nm fiber laser, the ultra-long distance detection is realized on the premise of ensuring the safety of human eyes, and the detection range of more than 10km can be reached, so that the limitation that the detection distance of the traditional laser radar is only 500m is broken; according to the invention, by selecting the 1550nm laser device which is safer to human eyes and greatly improving the laser power to kilowatt and even myriawatt levels, stronger echo signals are realized, so that the detection signal-to-noise ratio is remarkably improved; the micro-lens array is adopted to replace a traditional DOE diffractive optical element, efficient beam shaping of a one-dimensional or two-dimensional dot matrix is achieved through flexible regulation and control of the curvature radius and the distance of the micro-lenses, meanwhile, the manufacturing cost is reduced, and the design freedom degree is expanded.

An optical element, an optical element monitoring system, and a method, monitor in real time whether an optical element such as a diffractive optical element or a diffuser in an active light emitting module is damaged or falls off, and turn off a laser when the optical element is damaged or falls off.

The invention discloses a method for designing a myopia prevention and control lens based on harmonic diffraction. Relates to the technical field of eye vision optics, in particular to the technical field of a myopia prevention and control lens design method based on harmonic diffraction. According to the method, a harmonic diffractive optical lens chromatic aberration correction method and a harmonic diffractive optical lens diffraction efficiency calculation method when shielding is considered are firstly designed, chromatic aberration is effectively eliminated, the diffraction efficiency is evaluated, and then influences of chromatic aberration correction and shielding error manufacturing are balanced by designing a balance optimization model. The method comprises the following steps: designing a diffractive optical element on the refraction surface of a myopia prevention and control lens to obtain a refractive and diffractive optical lens; modulating the harmonic number # imgabs0 # of the refractive and diffractive optical lens to obtain a harmonic diffractive optical lens; designing a chromatic aberration correction method of the harmonic diffractive optical lens; harmonic diffractive optical lenses are designed that take into account additional refractive power and diffraction efficiency at the time of manufacturing shields.

Optical device films and methods of forming optical device films having a RMS surface roughness less than about 2.2 μin and a refractive index greater than 2.0 are provided. In one embodiment, an optical device film is provided and includes a crystalline or nano-crystalline material having a refractive index greater than 2.0. A top surface of the optical device film has a root-mean-square (RMS) surface roughness less than about 2.2 microinches (μin).

The embodiment of the invention discloses a diffractive optical structure, a method for regulating and controlling the diffraction efficiency of a non-coupling-in region and optical equipment. The diffractive optical structure comprises a substrate, and at least one coupling-in region and at least one coupling-out region which are arranged on the substrate; wherein the coupling-in area is used for coupling external light rays into the substrate, and the coupling-out area is used for performing pupil expansion on the light rays and coupling out the light rays; the coupling-out area is provided with a coupling-out grating with a residual layer, and the residual layer has a set thickness change trend at different positions of the coupling-out grating so as to regulate and control the coupling-out intensity of light; the refractive indexes of the residual layer and the substrate are different, the refractive index difference between the residual layer and the substrate is n, and n is larger than or equal to 0.1 and smaller than or equal to 0.8; the coupling-out area is configured to regulate and control the diffraction efficiency curve peak position of the coupling-out grating through the thickness change trend of the residual layer in the process that light is transmitted in the length direction of the diffractive optical structure.

A diffractive optical waveguide is disclosed, in which a grating structure comprises a plurality of optical unit structures arranged in an array, a cross-section of an optical unit structure has a shape with two small ends and a large middle part, length L and maximum width W of the cross-section satisfy 0.2L≤W≤0.8L, and contour curves each are formed between an upper vertex and a left vertex, the upper vertex and a right vertex, a lower vertex and the left vertex, and the lower vertex and the right vertex, respectively. A display device comprising the same and a design and formation method for the same are also disclosed. The cross-section of the optical unit structure has a curved contour, with edges which are smooth and have very good processability. Also, the cross-section with curve contour of the optical unit structure has a very high degree of design freedom.

The utility model provides a metasurface type speckle projector and depth detection equipment, which can realize a speckle projection function based on a light source array by using a metasurface and avoid the problem of zero-order bright spots or stronger background light generally existing when a diffractive optical element is used. The metasurface type speckle projector comprises a light source array used for emitting a plurality of conical light beams arranged in an array; the light modulation element has positive focal power, is arranged on the light emitting side of the light source array and is used for collecting the conical light beams from the light source array; and the metasurface element is arranged on one side, far away from the light source array, of the light modulation element and is used for regulating and controlling the light beams gathered by the light modulation element so as to form a plurality of collimated light beams projected towards different directions.

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.

A multi-laser beam focusing and scribing device with following function includes a beam splitter module, a focusing lens module, a first shaft, a diffractive optical element (DOE) beam shaping lens, a second adjustment shaft, a coaxial charge-coupled device (CCD) vision module, and a distance-measuring sensor. The first adjustment shaft is configured to adjust a focus position, and the second adjustment shaft is configured to adjust a spacing between scribed lines, and is electrically-powered. The beam splitter module is configured to split an incident laser beam into a plurality of sub-beams.

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.

The invention discloses a periscope head image difference compensation method and system, a computer and a storage medium, a periscope head comprises a reflecting prism, a lens group and a diffractive optical element, and the non-reflecting surface of the reflecting prism is provided with a polarization coating; the method comprises the following steps: constructing an optical path model according to design requirements of a periscope lens module, and carrying out aberration analysis on the optical path model; calculating a chromatic aberration compensation phase function of the diffractive optical element according to a chromatic aberration compensation formula; calculating a spherical aberration compensation phase function of the diffractive optical element according to a spherical aberration expansion formula; and calculating a total phase function of the diffractive optical element, and performing aberration compensation on the optical path model according to the total phase function. According to the long-focus periscope lens module, the total aberration of the periscope lens module can be compensated by utilizing the cooperation of the diffractive optical element and the reflecting prism with the polarization coating, so that the size of the long-focus periscope lens module is reduced, and the imaging quality of the long-focus periscope lens module is improved.

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 invention discloses a sidelobe-eliminating Bessel beam drilling device, and relates to the technical field of optical devices, the sidelobe-eliminating Bessel beam drilling device mainly comprises a light generation device, a beam shaping device and a regulation and control device, the light generation device is used for generating circularly polarized light; the light beam shaping device comprises a binary phase plate diffraction optical element and a Bessel light generating element, the binary phase plate diffraction optical element is used for modulating the phase of the circularly polarized light, the Bessel light generating element is used for converting the modulated circularly polarized light into Bessel light beams, the binary phase plate diffraction optical element can generate two different light beams, and the Bessel light generating element is used for generating the two different light beams. The beam shaping device comprises a first type of Bessel beams and a second type of Bessel beams, the first type of Bessel beams and the second type of Bessel beams can generate side lobe destructive interference and main lobe constructive interference, and the regulation and control device comprises a double telecentric optical system, is arranged at the tail end of the beam shaping device and can regulate and control the drilling depth and the drilling position of the beams. According to the invention, the side lobe ablation damage to the drill hole can be avoided to a great extent.

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.

The embodiment of the invention provides an optical system and intelligent head-mounted equipment. The optical system comprises an imaging assembly, a diffractive optical element and a display screen which are sequentially arranged along the same optical axis; the imaging assembly comprises a first lens, a reflection polarization element, a phase delay piece, a second lens and a light splitting element which are arranged in sequence; the first lens and the second lens are aspheric lenses; the diffractive optical element is glued with the display screen; the diffractive optical element is mainly composed of a substrate and a microstructure arranged on the substrate, and the microstructure is used for conducting phase modulation on light rays from the display screen, so that the light rays are bent and dispersed in the propagation process; through the phase modulation effect of the microstructure on the light, a chromatic aberration effect opposite to a vertical axis chromatic aberration generated by the imaging assembly can be generated. And after the light modulated by the microstructure enters the imaging assembly, the vertical axis chromatic aberration generated by the microstructure and the vertical axis chromatic aberration generated by the imaging assembly are mutually counteracted, so that the compensation of the vertical axis chromatic aberration of the imaging assembly is realized.

A method for manufacturing a low-angle blazed grating on a semiconductor or silicon substrate, includes spin-coating the substrate with resist layer or hydrogen or polysilsesquioxane, being 100-1000 nm or few hundred nanometers thick, applying grayscale irradiation lithography exposure to the resist layer, generating a dose modulated pattern therein, varying in response to absorbed energy density from irradiation lithography exposure. The coated, irradiated substrate is developed in solution, such as TMAH or NaOH, enabling a blazed profile having structures of thickness-dependent diffusion barriers or SiO2, with 0-1000 nm height to emerge. Thermal oxidation in oxygen atmosphere at elevated temperature with the developed substrate, converts the upper silicon substrate layer into SiO2 to a depth depending on the thickness of the pattern in the resist layer above. Hydrofluoric acid fluid removes the SiO2, creating low-angle low-roughness blazed grating structure on silicon 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.

There is provided a smoke detector including a light source, a diffractive optical element, a light sensor, a reflective tilted surface, and a light trap region. The light source projects a shaped light beam on the reflective tilted surface via the diffractive optical element. The reflective tilted surface is arranged right above the light trap region, and used to reflect the shaped light beam to the light trap region. A first light blocking wall is arranged between the light source and the light sensor. A second light blocking wall, higher than the first light blocking wall, is arranged between the light sensor and the light trap region.

Examples of the disclosure relate to light guiding apparatus comprising diffractive optics. The apparatus comprises a light guiding member comprising at least a first layer and a second layer. The respective layers are arranged to enable light to be guided through the light guiding member via internal reflections. The apparatus comprises in-coupling diffractive means and out-coupling diffractive means. The in-coupling diffractive means and the out-coupling diffractive means are provided on the first layer. An interface is provided between the first and second layer. The interface is configured to reflect light having a first wavelength and allow light having a second wavelength to pass through. The relative thicknesses and / or refractive indices of the respective layers are arranged so that the light having the second wavelength undergoes fewer internal reflections than the light having the first wavelength as the light is guided from the in-coupling diffractive means towards the out-coupling diffractive means.