56 results about "Diffractive lens" patented technology

The invention discloses an optical fiber spectrometer and a spectrum detection method, and relates to the technical field of spectrum detection, and the optical fiber spectrometer comprises an optical signal receiving module, a transmission optical fiber, and an optical fiber end face miniature light splitting device, a signal acquisition module and a spectrum information processing module which are integrated in an integrated housing. After the optical signal receiving module converts the optical signal into a parallel optical signal, the parallel optical signal is transmitted to an optical fiber end face miniature light splitting device which adopts a photoetching method to etch a binary Fresnel diffraction lens on a transmission optical fiber core to obtain a circular diffraction light spot, and the circular diffraction light spot is irradiated to the signal acquisition module; and the signal acquisition module converts the circular diffraction light spots into electric signals and transmits the electric signals to the spectral information processing module to obtain spectral information. According to the invention, the light splitting element is directly integrated on the end face of the optical fiber, the light path design is simplified, the miniaturization and portability of the device are realized through the integrated shell, the structure is compact, the performance is stable, high-precision real-time spectrum detection can be realized, and the device is suitable for various spectrum analysis scenes.

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.

A virtual image display device or an optical unit includes a display configured to emit video light, and a polarization-selective lens that is disposed facing the display and that has a refractive power that selectively acts on polarized light of the video light. The polarization-selective lens includes, in order from a display side, a polarizing diffractive lens having a positive refractive power with respect to the video light that is circularly polarized light and having a negative refractive power with respect to external light that is circularly polarized light, and an auxiliary lens having a positive refractive power equivalent to a refractive power of the polarizing diffractive lens.

A design method for a planar multi-order diffraction lens suitable for cooled infrared detectors belongs to the field of optical design technology. To address the problem that existing multi-order diffraction lenses are incompatible with cooled detectors, the method includes: step 1, fitting the lens surface structure in matrix form; step 2, designing a cooled on-axis field-of-view planar multi-order diffraction lens based on the on-axis point focusing efficiency; and step 3, increasing the off-axis field of view to expand the lens aperture, optimizing based on the full field of view, and designing a cooled multi-field-of-view planar multi-order diffraction lens. This method optimizes the cooled planar multi-order diffraction lens by freely assigning weights to the full field of view. By introducing a full-band, full-field-of-view optimization design method, the imaging quality within the full field of view is significantly improved. The multi-order diffraction lens designed using this method is suitable for cooled infrared detectors. This not only significantly simplifies the overall structure of the cooled infrared system, but also has important significance for improving the portability of the cooled infrared optical system.

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.

The present invention relates to a composite diffractive intraocular lens having at least one optical magnification or focal length. The composite diffractive intraocular lens comprises and combines a first diffractive lens structure having a saw-tooth shape and an increasing phase change values in a plurality of regions divided in the radial direction from the center of the lens, and a second diffractive lens structure having a saw-tooth shape and a decreasing phase change values in the same regions as the plurality of regions, and has a composite phase profile structure in which phase values at the boundaries of the regions do not sharply increase or decrease vertically.

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.

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

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.

To reduce the thickness of an imaging system of a virtual image display device.SOLUTION: A virtual image display device 100A, 100B or an optical unit 100 comprises: a display unit 40 that emits video light ML; a first polarization diffraction lens 51 that is arranged opposite to the display unit 40, and has a positive power for the video light ML being circularly polarized light; and a second polarization diffraction lens 52 that is arranged opposite to the display unit 40 with the first polarization diffraction lens 51 therebetween, and has a positive power for the video light ML being circularly polarized light passing through the first polarization diffraction lens 51.SELECTED DRAWING: Figure 2

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.

To correct chromatic aberration of a polarizing diffraction lens.SOLUTION: A virtual image display device comprises: a first image light emission device that emits first image light of a first color in a first state; a second image light emission device that emits second image light of a second color in a second state and transmits light in a state other than the second state; a first polarizing diffraction lens having positive power for the first image light and the second image light, which have circularly polarized light; a second polarizing diffraction lens having positive power for the first image light and the second image light, which are incident through the first polarizing diffraction lens and have the circularly polarized light; and a control device that controls the first image light emission device and the second image light emission device to switch between the first state and the second state. A first wavelength of the first color is shorter than a second wavelength of the second color, and a first dimension of a first pixel included in the first image light emission device is larger than a second dimension of a second pixel included in the second image light emission device.SELECTED DRAWING: Figure 2

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.

To provide a charged particle focusing device using a cylindrically symmetrical rotational crystal capable of realizing the function of an electron diffraction lens.SOLUTION: An electron beam focusing device comprises a rotational crystal film having a cylindrically symmetrical rotational crystal with a thin, planar structure that has been cut out along a vertical plane direction with respect to a polar direction (Z) from a center (O) of a spherical crystal, and that has the thickness between 5 nm and 1 mm. When an incident electron beam passes through the rotational crystal film, the resulting strong scattering points converge at a focal position f located away from the film thickness of the rotational crystal film. Preferably, a polar angle (θ) of the rotational crystal film and a predetermined distance (r) approximately satisfy the following formula with respect to an incident direction (Zbeam) of the incident electron beam and an out-of-plane normal direction [hkl] of the rotational crystal film: r / f=tanθ (where f is a constant).SELECTED DRAWING: Figure 22C

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.

To provide a diffraction lens that can be efficiently made both thin and achromatic at the same time, an optical system and a vehicle.SOLUTION: A diffraction lens 8 includes, on its incidence surface 8a, a first diffraction lens structure 20 such that diffraction grating of diffracted light of fifth order or larger in absolute value of diffraction order is maximum relative to light having a wavelength within a wavelength spectrum range of a light source, and a second diffraction lens structure 22 such that diffraction efficiency of diffracted light of first order or less in absolute value of diffraction order is maximum. The incidence surface 8a is formed as a diffraction lens surface where the second diffraction lens structure 22 is located adjacently to surround an outer periphery of the first diffraction lens structure 20 located in the center.SELECTED DRAWING: Figure 3

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.

And an optical system that images light from the display panel on the retina when combined with the eyeball, and that includes: a first refractive lens; a second refractive lens between the first refractive lens and the display panel; a third refractive lens between the second refractive lens and the display panel; and a diffractive lens located between the first refractive lens and the second refractive lens or between the second refractive lens and the third refractive lens. The optical system is configured such that light from the display panel passes three times through the second refractive lens by folding back an optical path, and the diffractive lens is configured such that a converted portion curvature of each portion varies according to a distance from an optical axis.

An ophthalmic lens (112′, 200) for use in preventing or slowing the development or progression of myopia comprises an optic zone (202) for focusing light from distant point objects to a focal surface. The optic zone comprises a diffractive lens (206) for manipulating the longitudinal chromatic aberration properties of the light proximate the focal surface.

A displacement sensor is provided, which can suppress the decrease in motion resolution and light receiving amount and achieve appropriate measurement accuracy and measurement speed. The displacement sensor (11) includes: a light source (110) that outputs white light; a light guide (201) that includes at least one optical fiber; a sensor head (300) that houses a diffraction lens (310) that causes the white light incident through the light guide (201) to generate chromatic aberration along the optical axis direction, and irradiates the chromatic aberration light onto a measurement object (TA); and a spectrometer (120) that obtains reflected light reflected by the measurement object (TA) and converged by the sensor head (300) through the light guide (201), and measures the spectrum of the reflected light. The optical fiber connected to the sensor head (300) has a larger core diameter than the optical fiber connected to the spectrometer (120).