37 results about "Diffractive lens" patented technology

The invention discloses an AR / VR module of an integrated prescription diffraction lens, an assembly calibration method and a calibration system, which are applied to the field of AR / VR optical machine system integration and calibration. According to the scheme, the interface structure, the reference surface and the positioning structure are arranged on the mirror frame or the carrier, so that stable assembly between the prescription diffraction lens and the display source, the waveguide or the light combiner is realized; and a closed-loop process is formed through metering before assembly, positioning installation, light path alignment, locking and fixing, calibration and acquisition, error decomposition, compensation writing and acceptance and archiving, so that a traceable data packet comprising a prescription version number, an error vector, a compensation parameter, an acceptance conclusion and a signature abstract is output.

This invention discloses a projection lens and projection system, including an aperture stop, a front group of lenses and a rear group of lenses located on either side of the aperture stop. A diffractive lens is disposed in the rear group of lenses. The diffractive lens includes a lens substrate, one side surface of which has a first diffraction structure, a first coating covering the first diffraction structure, and a second diffraction structure on the side surface of the first coating facing away from the lens substrate, with a second coating covering the second diffraction structure. By introducing a diffractive lens into the projection lens, and the diffractive lens having a double-layer diffraction surface, the system can maintain a high diffraction efficiency through the mutual matching of refractive indices, while simultaneously utilizing the negative chromatic aberration characteristics of the diffraction surface to complement the positive chromatic aberration of the lens's refractive surface. This significantly reduces chromatic aberration in the optical system and overcomes the problem of red and blue fringing in projected text. The introduction of the diffractive lens also provides more optimization freedom for the entire optical system, thereby achieving a small size and high performance for the projection lens.

The application discloses a phase design method and system of a diffraction lens applied to the field of optical device design, the method takes prescription parameters, an optical aperture and a field of view angle as input, takes a multi-order diffraction efficiency distribution function and a phase height field as joint optimization variables, constructs a target function across multiple wavelengths and multiple field of view angles, and introduces manufacturing constraints such as a minimum line width, step quantization, maximum slope and copy contraction in the optimization process, maintains the candidate height field in a manufacturable area through a projection operator, and outputs a design data package containing a phase height field, a multi-order efficiency distribution function, a chromatic aberration verification report, an MTF performance report, a tolerance sensitivity report, a version identification and an integrity check summary after optimization. In the 450nm-650nm waveband, the scheme can inhibit focal length dispersion and improve off-axis field image quality on the premise of considering manufacturability.

This invention relates to the field of optical lens production traceability technology, specifically a method for full-process version-based traceability of diffractive lenses. The method includes: after the diffractive lens product design stage is completed, assigning a globally unique product serial number to the design file; during the master mold manufacturing stage, retrieving the corresponding design file based on the serial number to generate and bind a master mold processing instruction set, generating a master mold data version identifier with creation time; during the replication production stage, retrieving the master mold version identifier based on the serial number, matching it with the corresponding physical master mold to generate and bind an adapted replication process parameter set, generating a replication process version identifier with creation time; and during the finished product testing stage, collecting measured performance data to form an acceptance report and binding it to the serial number, generating an acceptance data version identifier with creation time. This method achieves the binding and version-based identification retention of data at each stage of the diffractive lens production process with the product serial number.

The invention discloses a snapshot type light field spectral imaging method and system based on a micro refraction and diffraction lens array. And the front optical system, the micro-refraction and diffraction lens array and the area array detector are sequentially arranged along the light path direction. A measured target is subjected to primary imaging through the front optical system and then is subjected to secondary imaging through the micro-refraction and diffraction lens array to the area array detector. Each sub refractive and diffractive lens on the micro refractive and diffractive lens array has a spatial amplitude-spectral dispersion coded modulation function, spatial amplitude modulation is carried out on an incident light field, and then axial dispersion imaging is carried out on the incident light field to an area array detector of a rear focal plane, so that a two-dimensional fuzzy aliasing image is formed. And processing through a light field spectral imaging reconstruction algorithm to obtain a light field spectral data cube of the measured target. The imaging system provided by the invention is compact in structure, the light field spectral image of the target can be obtained only through one-time integral exposure and calculation reconstruction, the angle and depth of spectral imaging are calculated and adjusted within a certain range, and the imaging system is suitable for complex and dynamic target scene detection.

The invention relates to a diffraction spectrum array imaging system and a spectrum reconstruction method, in particular to a high-energy-efficiency integrated diffraction spectrum array imaging system and a parallel spectrum reconstruction method, and solves the problems that an existing diffraction spectrum array imaging system is low in energy utilization rate, poor in imaging quality, large in size and low in cost. And the technical problems of complex spectrum reconstruction and low precision are solved. According to the high-energy-efficiency integrated diffraction spectrum array imaging system provided by the invention, the diffraction lens array module and the micro-fluidic lens array module are connected through the coupling integration module, so that the problem of excessive energy loss caused by direct coupling of the diffraction lens array module and the micro-fluidic lens array module can be avoided; meanwhile, the coupling integration module comprises a three-stage coupling array of a coupling positive lens array, an aperture diaphragm array and a collimating lens array, and is simple in structure, efficient and small in size. The invention further provides a parallel spectrum reconstruction method, the PSF and the spectrum are corrected at the same time through a left-path and right-path parallel space structure, and high-precision reconstruction of the diffraction spectrum is achieved in combination with a 3D U-net network structure.

A first circuit sends electrical data. The electrical data is sent to a vertical-cavity surface-emitting laser (VCSEL). A wavelength of the VCSEL is modulated. The modulating includes emitting, by the VCSEL, a wavelength-modulated beam (WMB). The WMB is based on the electrical data that was sent. The modulating can be based on injecting current into the VCSEL. The modulating can be based on VCSEL chirp. The WMB is coupled optically to an optical medium. The optical medium comprises a waveguide or a fiberoptic cable. The coupling optically is accomplished using a grating coupler, a mirror, or an off-axis diffractive lens. The optical medium is further coupled to a wavelength-dependent optical element (WDOE). The WDOE decodes the WMB into the electrical data that was sent. The electrical data is delivered to a second circuit.

The invention discloses a projection lens and a projection system. The projection lens comprises a diaphragm, a front lens group and a rear lens group, wherein the front lens group and the rear lens group are located on the two sides of the diaphragm respectively. At least one diffractive lens can be arranged in the front lens group and / or the rear lens group, and the diffractive lens comprises a lens substrate and a coating located on the surface of the lens substrate. Wherein a diffraction structure is arranged on the surface of the lens substrate, and the coating covers the diffraction structure. The diffraction lens is of a laminated structure and has high diffraction efficiency on visible light wave bands. The diffractive lens can correct the chromatic aberration of the projection lens to avoid the problem of pixel offset, so that the projection system obtains high-quality projection images without light loss and dazzle light.

The invention discloses an image restoration method for an infrared simple lens imaging system with a wide signal-to-noise ratio range, and belongs to infrared image processing. The method comprises the following steps: S1, collecting a data set of infrared simple lens imaging as a training data set of a restoration model; s2, a Wavelet-ProxNet model is constructed to serve as a restoration model, and the restoration model adopts an asymmetric encoder-decoder structure and comprises an encoder and a decoder; s3, establishing a composite loss function as a constraint, and training the recovery model by using the training data set; and S4, for an image to be restored, generating a restored image by the trained restoration model. The diffraction lens infrared image reconstruction network model and the reconstruction method thereof provided by the invention have the advantages of high reconstruction quality, strong noise generalization and low calculation complexity, and promote practical and lightweight development of a diffraction lens infrared imaging technology.

The application belongs to the field of optics, in order to solve the problems of high demand for computer resources in the ADL optimization design process, low energy utilization rate of the optimization result, mapping eccentricity in the design and the like, a monolithic full-visible light imaging diffractive lens and a design method are provided. By setting an input plane wave matrix, a plane wave neural network imaging model passing through the ADL is constructed, a loss function is used as an optimization standard of the ADL surface microstructure, and a monolithic full-visible light imaging diffractive lens is designed by taking the PSF and the OTF as imaging constraint conditions of the ADL. The lens can image full-visible light, and the algorithm complexity of the current ADL design is reduced, and the defects existing in the design are solved.

The present invention relates to the technical field of AR optical module assembly, specifically to a diffractive lens optical machine interface structure and an assembly method for an integrated AR module. The method includes: extracting the reference plane of the frame and the optical center and axis position reference data of the diffractive lens to form a frame-lens combination, and then extracting the axis and end spherical center coordinates of the optical machine positioning posts on the outer side of the light exit port of the projection optical machine housing, importing them into the assembly coordinate system, calculating the theoretical vertical distance between the axis of the positioning post and the reference plane of the frame to generate installation pose data, and driving the optical machine to move until the end spherical center of the positioning post contacts the reference plane of the frame to complete the initial positioning. Detect the deviation of the initial positioning posture, control the elastic preloading mechanism of the frame assembly to generate corresponding elastic deformation, and use the deformation reaction force to push the optical machine for secondary adjustment until the posture deviation converges to the set threshold to complete the assembly. The present invention also provides an optical machine interface structure matching the assembly method.

The invention discloses an image fusion method based on a mixed multi-order diffraction lens, a medium and a program product, and relates to the technical field of image processing and optical engineering. First diffraction imaging data output by a mixed multi-order diffraction lens are obtained and input into a restoration network to obtain restored second diffraction imaging data, so that the defects of diffraction imaging are overcome. Furthermore, the image fusion network fully considers the scene of inherent degradation characteristics of the diffraction image during model training, and constructs a training sample more conforming to diffraction imaging characteristics, so that a stable and high-quality fusion result can be obtained by inputting the second diffraction imaging data into the fusion network. According to the two-stage fusion strategy provided by the invention, while the advantage of HMODL compact imaging is reserved, the detail representation and information integrity of dual-band imaging can be remarkably improved, and meanwhile, the robustness and application value of the system under the actual diffraction imaging condition are enhanced.

This invention proposes an image reconstruction method for physical degradation sensing of planar diffraction lens arrays. It utilizes a deep learning network integrating an optical degradation sensing mechanism to optimize sub-aperture feature fusion and weight allocation strategies, improving the imaging contrast and detail recovery accuracy of planar diffraction lens arrays. The method includes: acquiring a sequence of monochromatic sub-aperture images of the planar diffraction lens array carrying spatially non-stationary blur and diffraction degradation features; implicitly aligning the feature responses of each sub-aperture using an edge enhancement feature alignment module; constructing a pseudo-array feature representation; introducing a physically prior-guided weight modulation strategy during adaptive grouping upsampling, learning the distribution law of spatially heterogeneous point spread functions through degradation sensing units, and spatially adaptively modulating the feature contribution; and finally reconstructing a high-quality grayscale image. This invention significantly suppresses the diffraction blur and low contrast phenomena unique to planar diffraction lenses, better sensing optical degradation distribution and preserving high-frequency details in the image. It also provides a new approach for subsequent joint reconstruction research of arrayed lightweight imaging systems.

Provided is an optical communication device, such as a wavelength locker, a wavelength demultiplexer, an optical coupling system, and an optical switching system, using a small-sized lens element. An optical communication device includes, as a lens element, a liquid crystal diffractive lens element having an optically anisotropic layer that is formed using a composition containing a liquid crystal compound, and has a liquid crystal alignment pattern in which an orientation of an optical axis of the liquid crystal compound changes while continuously rotating toward one direction, in a radial shape from an inside toward an outside, and in the liquid crystal alignment pattern, in a case where a length over which the orientation of the optical axis rotates by 180° in one direction in which the optical axis changes is a single period, a length of the single period gradually decreases from the inside toward the outside.

The invention discloses a multi-order rotary zoom diffraction lens system design and an implementation method thereof, and relates to the technical field of optical lenses, the system comprises a first multi-order diffraction optical element and a second multi-order diffraction optical element superposed with a field lens phase, and the optical axes of the first multi-order diffraction optical element and the second multi-order diffraction optical element are on the same straight line. The combined focal power changes along with the change of the relative rotation angle, the focal power of the composite lens formed by combining the two lenses in the whole tuning range is equal at the harmonic wavelength based on the design wavelength, and the microstructure heights of the two lenses are directly calculated and determined through the geometrical relationship. According to the method, the height of the microstructure can be directly calculated and simulated through the wavelength and the material refractive index required in optical design, and the method is applicable to visible light and infrared bands and can be applied to the fields of imaging optical systems, visible light / short wave infrared spectral imaging, optical instruments and the like.

An optical system is an optical system that forms an image of light from a display panel on a retina when combined with an eyeball, the optical system including: a first refractive lens that collects light from the display panel; and a first diffractive lens provided between the first refractive lens and an image forming position, in which the first diffractive lens is configured such that a phase of light passing through an outer peripheral portion of the first diffractive lens is delayed from a phase of light passing through a central portion of the first diffractive lens.

This invention relates to a design method for a spatially multiplexed off-axis bifocal multi-order diffractive lens based on blue noise optimization. The method involves determining the off-axis angle and off-axis focal length to generate an ideal off-axis hyperbolic phase distribution φ. L and φ R Calculate the local density of the initial random mask, iteratively optimize and generate a blue noise mask, and then apply φ... L and φ R Mapping to a blue noise mask yields an off-axis bifocal multiplexed phase. A phase library of multi-order diffraction structures is constructed. Phase discrete encoding is performed based on minimizing the phase residual, mapping the discrete phase to a height distribution of the multi-order diffraction structure, thus completing the lens construction. This invention optimizes traditional spatial multiplexing masks based on blue noise, weakening local clustering features in the mask distribution, thereby reducing the mask's spectral characteristics and achieving low background noise and high energy consistency for ideal bifocal phases. Multi-order diffraction structures are used for phase encoding to realize the generation of bifocal phase devices.

The invention provides a pair of myopia prevention and control glasses of a photon-like sieve model, which comprises a lens main body, and an optical correction area, a defocus area and an edge arc area are concentrically arranged on the lens main body; the defocus area is arranged between the optical correction area and the edge arc area, the defocus area is provided with a photon sieve, the photon sieve is composed of a series of small holes distributed in concentric rings, and the arrangement of the small holes meets a window function; and the light transmission of the defocus area is lower than that of the optical correction area. The photon sieve meeting the window function is introduced into the defocus area of the myopia prevention and control lens, pupil dependence of a single refraction type optical design is overcome, the imaging quality of a traditional Fresnel diffraction lens is improved, the high-order diffraction and the side lobe effect are restrained, clear and stable myopia defocus is provided, meanwhile, a low-contrast environment is formed in the retina, and therefore the myopia prevention and control lens can be used for preventing and controlling myopia. And a refraction and diffraction mixed system is formed by utilizing the opposite dispersivity of the photon sieve and a traditional refraction material, so that the chromatic aberration problem of the photon sieve serving as a diffraction optical element is solved.

The invention discloses a three-dimensional display device and a display driving method thereof. The three-dimensional display device comprises a display screen and a diffractive lens array. The display screen is used for displaying images, and each frame of image displayed by the display screen is formed by overlapping at least two sub-image frames which are switched to be displayed. The diffractive lens array is located on the light emitting side of the display screen and comprises at least four diffractive lenses with different focal lengths. The diffractive lens array is used for imaging the sub-image frames on different image planes, and the distances between the different image planes and the diffractive lens array are different, so that the depth of field of the three-dimensional display device is effectively expanded. According to the three-dimensional display device provided by the embodiment of the invention, additional polarization conversion and control elements do not need to be introduced, the complexity of the device is reduced, and the manufacturing cost is reduced.

The present application discloses a projection lens and a projection system. The projection lens comprises: a diaphragm, and a front lens group and a rear lens group respectively located on two sides of the diaphragm. At least one diffractive lens may be provided in the front lens group and / or the rear lens group, and the diffractive lens comprises a lens substrate and a coating located on a surface of the lens substrate. The surface of the lens substrate is provided with a diffraction structure, and the coating covers the diffraction structure. A stacked structure is used for the diffractive lens to achieve high diffraction efficiency across the visible light band. The diffractive lens can correct chromatic aberration of the projection lens, avoiding the problem of pixel offset, and enabling the projection system to obtain high-quality projection images without light loss or glare.

Devices and methods are provided for performing color correction of focal dispersion in high-harmonic lenses. The device comprises a multi-order diffractive engineered surface (MODE) lens comprising a MODE primary lens having height transitions in the front surface that segment it into annular zones and a color corrector comprising a diffractive Fresnel lens (DFL). Polychromatic light passing through the MODE primary lens experiences LCA that is corrected by the color corrector. The color corrector can be configured to correct Type 1 LCA resulting from a combined effect of the DFL and a refractive index change versus wavelength associated with material comprising the device that together produce a change in focus of the polychromatic light, as well as Type 2 LCA resulting from a cyclic variation in focal length versus wavelength caused by the abrupt changes in the height of the front surface of the MODE primary lens at the transitions.

This invention belongs to the field of multi-order diffractive lens (MDL) fabrication, specifically relating to a method for analyzing manufacturing errors of MDLs based on annular reconstruction differential. The method includes: firstly, constructing an error function ε to address the types of topographic errors caused by fabrication in the MDL; then, based on the constructed error function ε, obtaining the MDL error height distribution matrix h. ij Then, the diffraction field of the MDL at the focal plane is calculated; finally, the optical performance indicators of the MDL under the influence of errors are calculated, including relative focal position shift and relative focusing efficiency loss. This invention can effectively analyze the optical performance related to complex morphological errors formed during the MDL manufacturing process; it can accurately analyze the changing trend and range of optical performance loss of MDL under the influence of manufacturing errors through theoretical calculations and simulations; it has high applicability and accuracy in the optical performance analysis of MDL under arbitrary error morphologies; this invention facilitates process improvement and is highly practical.

The present application provides a small, high light utilization efficiency, less image display unit and head-mounted display. The image display unit of the present application has: image display device; polarized light diffraction element, diffracting light emitted from the image display device; and polarizer, transmitting polarized light diffracted by the polarized light diffraction element, and absorbing light not diffracted by the polarized light diffraction element, the polarized light diffraction element is a polarized light diffraction lens with lens function, the focal length of the polarized light diffraction lens is set as f, the distance between the image display device and the polarized light diffraction lens is set as d, and d≤f is satisfied.

The application discloses a design method of an off-axis image quality optimized ultrathin diffractive lens, relates to the technical field of optical device design, and comprises the following steps: constructing an initial ultrathin diffractive lens phase model in a non-rotationally symmetric phase surface shape description mode, generating a system wavefront error data set and carrying out field partition weighting processing, inputting the weighted data set into an optimization evaluation function with a main light ray incidence angle sensitive aberration constraint term, coupling a global search operator for iteration and dynamically adjusting polynomial coefficients, extracting phase surface shape coefficients after iteration convergence, calculating manufacturable step depth distribution data, and outputting a nanoimprint master layout or etching depth table. The scheme can adapt to the asymmetric incidence characteristics of an off-axis optical system, accurately constrain off-axis aberration distortion, and directly connect with the ultrathin diffractive lens manufacturing chain.

The utility model discloses a high-power optical isolator, which comprises a magnetic ring, a first diffraction lens, a second diffraction lens, a first wedge-shaped birefringent crystal, a second wedge-shaped birefringent crystal and a dynamic adjustable wedge-shaped angle, accurate matching and regulation of incident light with different wavelengths and powers can be achieved, the bearing capacity of the optical isolator for high-power laser is improved, all optical elements are fixed through optical cement, the problem that traditional organic cement loses efficacy due to the influence of high temperature and strong light is avoided, the stability of the optical isolator is ensured, and the service life of the optical isolator is prolonged. The dynamic adjustable wedge-shaped angle is finely adjusted through piezoelectric ceramics, the precision and stability of the optical isolator are improved, the surfaces of the first diffraction lens and the second diffraction lens are plated with aluminum nitride heat conduction layers, and micron-sized cooling flow channels are embedded, so that the temperature of an optical element is effectively reduced, and performance reduction or damage caused by overheating is prevented; and the service life of the optical isolator is prolonged.

The invention discloses an acceleration method and device for fast plane diffraction lens imaging based on an FPGA platform, and the method specifically comprises the steps: carrying out the pruning processing of a neural network model, evaluating the loss of the neural network model through a loss function, carrying out the fine adjustment of parameters, carrying out the quantification processing of the neural network model, and carrying out the calculation of the loss of the neural network model. Performing fine tuning and repairing on the quantized neural network model; compiling the neural network model to ensure that the model can run smoothly on the FPGA, and providing a system environment for deployment of the model through hardware design; and finally, deploying the neural network model on an FPGA, processing a blurred image formed by the plane diffraction lens by using the deployed neural network model, and outputting a low-delay high-frame-rate reconstructed image. According to the method, on the premise of considering the imaging quality, the neural network model reasoning acceleration is realized, the imaging delay is reduced, and the method is suitable for miniaturized and low-delay imaging equipment.

The invention provides a method for correcting refractive index of a remodeled artificial lens based on femtosecond laser, which comprises the following steps of: scanning an IOL (input / output lens) by using a femtosecond laser processing platform, processing a diffraction grating, and measuring the refractive index of the processed IOL; s2, a human eye model containing IOL is imported into the ZEMAX, and a diffraction lens machined on the IOL is simulated by selecting a binary plane bifacial type; s3, according to the target diopter, determining a phase polynomial coefficient of a two-dimensional plane, and according to the diffraction efficiency, adjusting diffraction lens parameters, so that the optimized optical system meets a predetermined imaging quality evaluation standard; and S4, converting the surface type parameters of the optimized binary surface 2 into a femtosecond laser scanning path and processing parameters. According to the method, a real material refractive index change value is obtained through experimental measurement and is used as a core input parameter for designing a diffraction lens in ZEMAX, so that a final correction scheme is established on a reliable physical basis, and the correction accuracy and reliability are remarkably improved.

An optical system having high optical performance, an optical apparatus including the optical system, and a method for manufacturing the optical system are provided. An optical system used for an optical apparatus such as a camera includes a front lens group including a diffraction lens having a diffraction surface, and a rear lens group disposed on an image side of the front lens group. The optical system is configured so that an interval between the lens groups changes at magnification change. The optical system is also configured so that a condition expressed by a predetermined conditional expression is satisfied.

The application provides an optimization algorithm of a multi-focus diffractive lens, which comprises the following steps: determining the number of focal points, the diffraction order of each focal point and the target diffraction efficiency of each focal point according to actual application requirements; randomly assigning an initial phase to each focal point and calculating the complex amplitude of light waves; cyclically modulating the complex amplitude of light waves and the diffraction efficiency of each focal point by using a phase retrieval method; and determining the change relationship between the complex amplitude of light waves after modulation and the radial distance of the wave front from the distance pupil center by using the modulation method. By the method of the application, a multi-focus diffractive lens with no sharp corner, higher diffraction efficiency and freely controllable diffraction efficiency of each focal point can be designed.

Apparatuses, systems and methods for providing improved ophthalmic lenses, particularly intraocular lenses (IOLs). Embodiments may include a shift of a diffractive order.