68 results about "Diffraction optics" patented technology

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.

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).

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.

A computer-free system and method is disclosed that uses an all-optical image reconstruction method to see through random diffusers at the speed of light. Using deep learning, a set of transmissive layers are trained to all-optically reconstruct images of arbitrary objects that are distorted by random phase diffusers. After the training stage, the resulting diffractive layers are fabricated and form a diffractive optical network that is physically positioned between the unknown object and the image plane to all-optically reconstruct the object pattern through an unknown, new phase diffuser. Unlike digital methods, all-optical diffractive reconstructions do not require power except for the illumination light. This diffractive solution to see through diffusive and / or scattering media can be extended to other wavelengths, and can fuel various applications in biomedical imaging, astronomy, atmospheric sciences, oceanography, security, robotics, autonomous vehicles, among many others.

The application discloses a structured light emission module and a self-calibration method and device thereof and a medium, relates to the technical field of optical three-dimensional perception, and is applied to a preset integrated structured light emission module, and comprises the following steps: synchronously turning on working light sources and calibration light sources in a VCSEL array under current working parameters; wherein the working light sources are projected to a working area of a metasurface diffractive optical element after being collimated by a preset collimating optical system, so as to generate a working speckle pattern for three-dimensional detection; the calibration light sources are projected to a calibration area of the metasurface diffractive optical element after being collimated by the preset collimating optical system, so as to generate a preset reference pattern; an actual reference pattern generated by the calibration area is collected by using an embedded detector, the actual reference pattern is compared with the preset reference pattern, and a pattern deviation is obtained; a temperature drift compensation amount is calculated based on the pattern deviation and module temperature data collected by a temperature sensor; and the current working parameters of the VCSEL array are adjusted according to the temperature drift compensation amount.

An eyepiece waveguide for an augmented reality display system includes a substrate having a first surface and a second surface and a diffractive input-coupling element. The diffractive input-coupling element is configured to receive an input light beam and couple the input light beam into the substrate as a guided light beam. The eyepiece waveguide further includes a diffractive combiner pupil expander-extractor (CPE) element formed on or in the first surface or the second surface of the substrate. The diffractive CPE element includes a first portion and a second portion divided by an axis. A first set of diffractive optical elements is disposed in the first portion and oriented at a positive angle relative to the axis, and a second set of diffractive optical elements is disposed in the second portion and oriented at a negative angle relative to the axis.

This application relates to the field of airport navigation aids technology, and more particularly to a navigation lighting device, including a lamp housing assembly, a composite optical assembly, and a power supply assembly. The lamp housing assembly includes a lampshade and a lamp tube. The lampshade is connected to the top of the lamp tube via a connecting plate. The lampshade has a first chamber, in which the composite optical assembly is disposed. A second chamber is formed inside the lamp tube, and the power supply assembly is disposed inside the second chamber. The composite optical assembly includes a light source, a spherical mirror, a reflector, and a diffractive optical element. The light source is connected to the connecting plate. The spherical mirror is a convex mirror, with its convex end facing the light source. The reflector has a through-type frustum design, with one end facing the spherical mirror and the other end connected to the diffractive optical element. The surface of the diffractive optical element is circular, and the diffractive optical element abuts against the light outlet of the lampshade. This application has the ability to improve the luminous efficiency of LEDs.

A machine vision task, machine learning task, and / or classification of objects is performed using a diffractive optical neural network device. Light from objects passes through or reflects off the diffractive optical neural network device formed by multiple substrate layers. The diffractive optical neural network device defines a trained function between an input optical signal from the object light illuminated at a plurality or a continuum of wavelengths and an output optical signal corresponding to one or more unique wavelengths or sets of wavelengths assigned to represent distinct data classes or object types / classes created by optical diffraction and / or reflection through / off the substrate layers. Output light is captured with detector(s) that generate a signal or data that comprise the one or more unique wavelengths or sets of wavelengths assigned to represent distinct data classes or object types or object classes which are used to perform the task or classification.

A diffractive optical element comprising at least one achromatic half-wave plate and at least one chromatic half-wave plate, each half-wave plate comprising at least two layers of a polymerized chiral liquid crystal (LC) material on a substrate, wherein at least one of the substrates has a periodic surface grating, a method for its preparation. Also, its use in optical or electrooptical components or devices, especially for digital optics or augmented reality or virtual reality (AR / VR) applications like non-mechanical beam steering elements, optical waveguides, optical couplers, optical combiners, optical deflectors, polarization beam splitters, partial mirrors or lenses.

The application discloses a kind of diffractive microstructure library management system, method, storage medium and optical element applied to the field of diffractive optical element design, the transmission amplitude and phase of unit structure under different polarization states are simulated / measured, and polarization sensitivity index is calculated, the structure library index with "exclusive area / turning rule" is established, so that the unit structure that meets can be preferentially selected when generating prescription phase height field, to reduce the phase error and ghost risk caused by polarization, and output the data packet with version number, hash signature and audit field for cross-site replication, by introducing quantitative polarization sensitivity index, and actively screening unit structure that meets polarization sensitivity index meets set threshold in design stage, fundamentally reduce the dependence of diffractive optical element on incident light polarization state, so as to effectively reduce phase error, ghost and image quality degradation.

This invention relates to the field of holographic display and optical measurement technology, specifically disclosing a brightness testing system and method for reflective hologram displays based on an integrating sphere. The method uses a single-wavelength laser, spatially filtered and collimated, incident at a specific angle onto a reflective hologram placed within an integrating sphere for reconstruction. The integrating sphere is used to integrate and collect the multi-angle, non-uniform light rays diffracted from the hologram, and a light trap is used to suppress the zero-order reflection background. System calibration is performed using a standard diffuse white plate, and the absolute diffraction efficiency of the hologram is finally calculated. This invention effectively solves the problem that traditional point measurement methods are difficult to accurately obtain the total diffracted light flux of a hologram, and is suitable for the quantitative evaluation of the brightness and efficiency of diffractive optical elements such as reflective holograms and volume holographic gratings.

Described examples include an apparatus includes a dichroic wedge and a spatial light modulator optically coupled to the dichroic wedge. The apparatus also includes a display optically coupled to the spatial light modulator. The display includes a waveguide having a first side and a second side and a first diffractive optical element on the first side of the waveguide. The display also includes a second diffractive optical element on the first side of the waveguide and a third diffractive optical element on the second side of the waveguide.

This invention relates to a polarization-customized holographic device based on a spin-decoupled plasmonic metasurface, belonging to the fields of micro-nano optics, diffraction optics, and holographic imaging. The device employs a three-layer metal-dielectric-metal reflective structure, consisting of a bottom metal reflective surface, an intermediate dielectric spacer layer, and a top anisotropic metaatomic layer. The top metaatomic layer is composed of various periodically arranged metaatoms. By superimposing the propagation phase and geometric phase, phase decoupling between left-handed circular polarization (LCP) and right-handed circular polarization (RCP) is achieved, allowing independent control of their phase delays. Precise customization of the output linear polarization direction is achieved by adjusting the phase difference between the two. This invention breaks the lock-in relationship between geometric phase and spin state in existing metasurface holographic devices, achieving highly integrated, high-quality polarization-customized holographic imaging. It exhibits stable performance over a wide spectral range and large incident angles, and can be widely applied in optical encryption, secure displays, and optical communications.

A beam replication arrangement for use in an optical processing system that comprises at least one diffractive optical element (DOE). The DOE is configured to receive a plurality of input beams of light encoding an input vector, and produce a plurality of spatially-separated replica beams of each input beam. The plurality of replica beams comprises, for each input beam, a plurality of first replica beams and a plurality of weighted replica beams. Intensities of the first replica beams are an integer multiple of intensities of the weighted replica beams, where the integer multiple is greater than one.

This portable laser surface treatment device for outputting a laser beam toward the surface of an object to treat said surface includes, e.g., a housing, a beam shaper that is accommodated within the housing and is supported by the housing so as to be capable of rotating or moving in a reciprocal manner, an optical component that is fixed to the housing, and an operation mechanism for rotating or reciprocally moving the beam shaper. The laser beam that is introduced into the housing and passes through the optical component and the beam shaper is outputted, and a spot of the outputted laser beam is capable of rotating or reciprocally moving on the surface. The beam shaper may be a diffractive optical element.

An augmented reality optical system includes a source of virtual content and an eyepiece waveguide optically coupled to the source of virtual content. The eyepiece waveguide includes an incoupling diffractive element and an outcoupling diffractive optical element. At least one of the incoupling diffractive element or the outcoupling diffractive optical element comprises a polarization volume grating (PVG).

The application discloses a chiral nematic liquid crystal grating based on an asymmetric orientation template and a preparation method, relates to the field of liquid crystal diffraction optical devices and near-eye display (XR / AR) optical waveguide coupling grating manufacturing technology. The preparation method comprises the following steps: step S10: providing a first substrate and a second substrate and preparing an orientation layer; step S20: forming an asymmetric grating orientation template; step S30: assembling a liquid crystal box; step S40: filling a reactive mesogen mixture; step S50: inducing by temperature reduction and curing under ultraviolet light to form a stable chiral nematic liquid crystal grating. The application adopts an asymmetric orientation template, avoids the high-precision registration requirement of double-sided patterning orientation on period and phase and the risk of orientation disorder, effectively suppresses defects such as dislocation and domain boundary, improves the structural integrity of the grating and the stability of the diffraction efficiency, and simultaneously reduces the equipment and process requirements, improves the yield and consistency in mass production.

A wave front manipulator can include an optical axis and at least two diffractive optical components, which are arranged successively along the optical axis. The diffractive optical components each can include a diffractive structure having a number of diffractive holographic structural elements. The wave front manipulator is designed to vary a wave front between at least two different states via the diffractive structures of the at least two diffractive optical components.

The application discloses a polarization-insensitive diffraction unit structure library construction and indexing method, relates to the technical field of diffraction optical device design, and comprises the following steps: collecting diffraction response data under irradiation of multiple polarization states of incident light, extracting frequency domain amplitude and phase distribution characteristics through Fourier transform, and constructing a three-dimensional geometric model of a candidate diffraction unit through parameterized modeling. The model is imported into full-wave electromagnetic simulation software to strictly solve in a wide spectral range, simulation scattering field data containing polarization state information are generated, polarization-sensitive configurations are removed through post-processing, polarization-insensitive unit sets are formed by retaining structures with consistent responses in multiple polarization channels, a mapping relationship table of unit geometric parameters and optical performance parameters is established, and the table is stored in a library. The method can weaken the polarization dependence of the optical performance of the structure, guarantee the response stability in multiple polarization channels, realize accurate correlation of parameters, and improve the directivity and adaptability of structure library indexing.

The present disclosure relates to an optical lightguide system comprising: a first lens part comprising an eye facing surface, a second lens part comprising a world facing surface, the first lens part affixed to a second lens part, with a cylindrically shaped interface therebetween; the first and second lens parts defining a lightguide wherein the eye facing surface and the world facing surface are non-parallel; an in-coupling diffractive optical element arranged between first and second lens parts at the cylindrically shaped interface to receive reflected light from the and object and couple the reflected light into to the lightguide such that light propagates around the lightguide to a second location and wherein the in-coupling diffractive optical element comprises a lens function having negative power.

The application discloses a laser processing device and a laser processing method, and relates to the field of laser processing.The device comprises a composite beam shaper, a diffraction optical element and a super surface.The diffraction optical element and the super surface are respectively located on two sides of the base.The composite beam shaper converts an incident light beam into a target flat-top light beam by changing at least one of the length of a super atom in the super surface in two orthogonal directions, the azimuth angle of the super atom and the height of a structural unit in the diffraction optical element, and adjusting the phase distribution of the composite beam shaper.By combining the diffraction optical element and the super surface, a composite beam shaping device is generated, so that the laser Gaussian energy distribution is shaped into a flat-top uniform energy distribution.The composite beam shaping device is used to replace the beam shaping element and the objective lens in the traditional laser processing system, so that the problems, such as large volume and complex optical path, inherent in the traditional beam shaping system can be solved, and the miniaturization and integration of the processing device are realized.

An apparatus includes a pixel shifter to receive light representative of pixels and to modify a first angle of the light to one of a plurality of predetermined second angles based on a control signal. The apparatus also includes a controller to provide the control signal to the pixel shifter. The control signal indicates different ones of the plurality of predetermined second angles in different time intervals corresponding to subframes of an image frame produced by the plurality of pixels. In some cases, the apparatus also includes a waveguide to receive the light from the pixel shifter and to convey the light to a diffractive optical structure that renders the light visible to a user. The pixel shifter can modify the first angle to increase a resolution of some or all the image perceived by the user or to mitigate or eliminate local defects in the display.

The optical wave selective switch device comprises a fiber array unit comprising a plurality of input / output ports for sending / receiving laser beam signals having different bandwidths, a switching element for steering laser beams in a switching direction, to specific output ports of the fiber array unit, a dispersing element which disperses laser beam signals which are incident thereon, depending on the wavelength of the laser beam signals. Furthermore, the optical wave selective switch device comprises a diffractive optical element with a two-dimensional phase mask is located adjacent to the switching element and outside of electrodes of the switching element so as to introduce individual phase correction for each wavelength corresponding to respective channels in the optical wave selective switch device.

The embodiment relates to a laser drilling system and a method for selectively removing an insulating layer, and comprises: a workpiece including a metal layer and an insulating layer disposed on the metal layer; a stage on which the workpiece is placed; an optical delivery system disposed on the stage and configured to deliver laser light to the insulating layer; a laser beam generator connected to the optical delivery system and configured to output laser light; a blowing-suction device disposed between the workpiece and the optical delivery system; a monitoring-inspection device configured to inspect the surface shape of the workpiece; and a control unit configured to control the laser light generated by the laser beam generator and / or the optical delivery system based on the surface shape information, wherein the optical delivery system controls the laser light by means of a diffractive optical system.