79 results about "Phase mask" patented technology

The invention relates to the technical field of laser micromachining, in particular to a TGV drilling machining system and method based on a space-time modulation Bessel beam, an initial laser beam is output through a laser device, the initial laser beam is modulated into a dynamic pulse sequence through a pulse chirp regulation and control module, axial energy attenuation is compensated, a machining subsystem generates the Bessel beam, and the TGV drilling machining system and method based on the space-time modulation Bessel beam are obtained. The angle is finely adjusted in real time through piezoelectric driving, and a dynamic spatial light modulator loads an exponential decay type phase mask, so that light beam airspace shaping, non-diffraction light beam generation, pulse time sequence and phase parameter synchronous control and high-peak power pulse array are realized, and finally, integrated micro-perforation and channel modification of the glass substrate are realized; and the machining efficiency and precision are obviously improved.

The invention provides a long-depth-of-field integrated imaging display, a long-depth-of-field integrated imaging method and a long-depth-of-field integrated imaging system. The long-depth-of-field integrated imaging display comprises an image processor, a display, a microlens array and a quartic phase mask, the pupil position of each micro lens of the micro lens array is correspondingly integrated with a quartic phase mask; the image processor is used for acquiring a to-be-displayed image and constructing an element image array; performing inverse convolution processing on each element image in the element image array based on a preset phase mask function, and constructing a preprocessed element image array matrix; performing negative value processing on the preprocessed element image array matrix to obtain a preprocessed element image array; and the display is used for displaying the preprocessed element image array, so that the preprocessed element image array generates a long depth-of-field image through the micro-lens array and the quartic phase mask. According to the invention, defocus blurring is effectively suppressed without introducing an extra complex optical structure, a long depth-of-field image is generated on the premise of ensuring the image contrast, and the integrated imaging display quality is improved.

A method for designing and optimizing a lensless imaging device includes: (a) a method for optimizing the point spread function for various imaging, computer vision and artificial intelligence tasks, (b) a method for computing the optimal phase mask that can realize the desired point spread function, (c) using the optimal phase mask in a lensless camera and (d) a method for calibrating the lensless imaging device using a single captured image.

A system includes a microscope and computer system communicably coupled together. The microscope includes a camera, phase mask, and ultraviolet source. The phase mask is disposed within a view of the camera. The microscope is configured to scatter a light illuminating a tissue by emitting, using the ultraviolet source, an ultraviolet radiation towards the tissue and obtain, using the phase mask and the camera, an image of an illuminated surface of the tissue. The tissue includes at least one diagnostic feature. The image is within a predefined depth of field, inclusive, and includes a manifestation of the at least one diagnostic feature. The computer system is configured to determine a deblurred image from a trained first artificial intelligence model based on the image.

The invention provides a screen information anti-leakage method and system, and relates to the field of information security, and the method comprises the steps: calculating and generating a target moire fringe pattern which can strongly interfere with secret photographing equipment based on preset secret photographing equipment parameters and the energy distribution of original information in a transform domain; the Hash value of the original information content and the dynamic safety parameters are subjected to logical operation and then input into a hyperchaotic system, a chaotic phase mask bound with the content and time is generated, amplitude-frequency information and a mask of moire fringes are combined, a preset imaging light path model is subjected to reverse optimization calculation, and a stable and effective anti-divulging disturbance pattern within a preset range is obtained. And carrying out pixel-level superposition on the anti-leakage disturbance pattern and the original information through a multi-scale fusion algorithm, generating a display frame, outputting the display frame to a screen, and updating the disturbance pattern along with the frame or the period to resist the attack of multi-frame average interference elimination.

A high-power multiplexer / demultiplexer ("mux / demux") and a three-dimensional ("3D") printed phase mask are provided for hollow-core optical fiber applications. The high-power mux / demux includes hollow core optical fiber interfaces configured to couple with free-space optical fiber cables, a diffraction grating, a 3D printed phase mask, and a set of lenses. The diffraction grating is configured, based on different wavelengths, either to at least diffract each optical signal of a plurality of optical signals having different wavelengths into two or more optical signals or to at least diffract a single optical signal having multiple wavelengths into a plurality of optical signals. The phase mask includes reflective features configured to reflect optical signals at different optical path lengths to provide reflected optical signals with different phases. The set of lenses is configured to collimate optical signals onto or from the diffraction grating or to focus optical signals onto or from the phase mask.

Provided are an apparatus for manufacturing a cover window, a method for manufacturing a cover window, and an electronic device including a cover window. The apparatus for manufacturing a cover window includes a light source outputting an original laser beam, a beam splitter splitting the original laser beam into a main beam and at least one sub-beam, a first phase mask diffracting the main beam to convert the main beam into a straight beam, a second phase mask diffracting the sub-beam to convert the sub-beam into a dot-line beam including a plurality of dot beams, a beam combiner combining the main beam and the sub-beam to form a single combined beam, and an objective lens focusing the combined beam onto a focal plane, wherein the beam splitter sets extension directions of polarization axes of the main beam and the sub-beam to be different from each other.

The application relates to an optimization design method of a polygon-based multi-plane device, comprising the following steps: S1. determining parameters of a polygon-based MPLC device; S2. constructing a topological-mode coupling model to determine a phase compensation amount; S3. generating an initial phase mask according to the phase compensation amount calculated in step S2 and in combination with phase distribution characteristics of a target mode; S4. outputting optimized phase mask parameters based on a genetic optimization algorithm; and S5. simulation verification: building simulation models of different topological structures, inputting the optimized phase mask parameters, simulating a mode evolution process, and analyzing whether a performance threshold value meets a demand. The application solves the problems that a traditional algorithm ignores the influence of a topological structure and the generality of a phase mask is poor, realizes accurate design of different polygon devices, and thus effectively reduces loss and improves shaping effect.

The invention discloses a multi-wavelength channel diffraction neural network system based on threshold screening and a processing method, and belongs to the technical field of artificial intelligence and optical computing. Comprising an encoding module used for encoding task information corresponding to different to-be-processed tasks to multiple light beams with different working wavelengths output by a light source module to form multiple task channel light fields; the optical diffraction module comprises a plurality of modulation layers; the optical diffraction module is used for receiving the task channel light fields and realizing diffraction modulation and threshold screening of the task channel light fields by changing the metasurface structures on different modulation layers; each task channel light field shares the same set of diffraction modulation parameters, namely parameters such as phase, mask generation and threshold; threshold screening: comparing the mask generation parameter with a threshold parameter, performing binarization selection on the phase parameter according to a comparison result, and screening out a target phase parameter; the output detection module detects the output light intensity. Task channels are expanded, and the system integration degree is improved.

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 application discloses a phase mask plate preparation method for inhibiting a Fabry-Perot effect, and comprises the following steps: a dispersion fiber grating model is established, and reflection spectrum, transmission spectrum and group delay curve of the dispersion fiber grating are obtained through simulation; an ultra-Gaussian cut-off function model is established; according to the reflection spectrum and the transmission spectrum of the dispersion fiber grating and the ultra-Gaussian cut-off function, the reflection spectrum, the transmission spectrum and the group delay curve of the optimized dispersion fiber grating are obtained through simulation, and then a refractive index modulation depth distribution curve of a grating area of the phase mask plate is obtained; the refractive index modulation depth distribution curve of the grating area of the phase mask plate is optimized to obtain an optimized refractive index modulation depth distribution curve; a diffraction efficiency distribution curve and a groove depth of the phase mask plate are calculated; and the phase mask plate is obtained according to the groove depth of the phase mask plate. According to the application, the groove depth distribution of the phase mask plate used for writing is only adjusted, the Fabry-Perot effect can be effectively inhibited, and therefore the reflection spectrum flatness of the dispersion fiber grating is improved.

A design method of a Gibbs-Wulff optical vortex array mask plate, steps are as follows: obtaining an electric field expression of a Gibbs-Wulff optical vortex array, combining the amplitude, phase of the Gibbs-Wulff optical vortex array with a blazed grating, obtaining a complex transmittance function of the Gibbs-Wulff optical vortex array mask plate, and the mask plate described based on the complex transmittance function is the Gibbs-Wulff optical vortex array mask plate. The present application utilizes the principle of computer holography, and obtains the amplitude modulation phase mask plate of the Gibbs-Wulff optical vortex array through computer coding, so that the Gibbs-Wulff optical vortex array with controllable boundary and controllable structure and arrangement mode in the boundary can be generated. Thus, the present application has important application value in the fields of particle manipulation and optical micro-machining.

The invention discloses an image anti-counterfeiting method based on vector quantization and a phase mask, and the method comprises the steps: firstly, selecting a two-dimensional code which is simple in structure and only has transverse and longitudinal black and white change characteristics as an information medium, and simplifying a subsequent phase modulation structure while keeping the recognition characteristics clear; a vector quantization image compression technology is utilized to effectively code a high-definition image with rich content into a simplified graphic expression in which a two-dimensional code can be embedded, and effective mapping and compression from image complexity to a barcode structure are realized; and finally, a low-order pure-phase optical mask is generated based on the two-dimensional code, embedding and optical reconstruction of a high-definition image are realized under the condition that the phase quantization order is relatively low, and both the image identification degree and the mask preparation feasibility are considered. Therefore, the innovative image-level anti-counterfeiting coding method which integrates physical anti-counterfeiting and digital anti-counterfeiting advantages and has high information bearing capacity and strong physical anti-counterfeiting performance is constructed. The invention provides a feasible, efficient and low-cost new path for physical anti-counterfeiting of high-definition images.

The invention relates to the technical field of extreme ultraviolet lithography masks, in particular to an extreme ultraviolet lithography mask multilayer film defect detection method based on a photoelectron image, which comprises the following steps: S1, simulating to generate m phase type mask multilayer film defect structures with different morphological characteristics; s2, using an interpolation approximation method to extract electric field intensity distribution near the surface layer of the mask multilayer film defect structure, and establishing a simulation photoelectron image data set; s3, constructing a neural network model for defect detection, training the network, and obtaining an optimal network weight parameter; and S4, detecting the type and morphology parameters of the defect structure of the multi-layer film of the mask. The method has the characteristics that the photoelectron image is easy to obtain, the neural network training data set is small, and the detection efficiency is high, and high-precision nondestructive detection of the extreme ultraviolet lithography mask multilayer film defects can be realized.

The invention relates to a method (200) for determining relative lateral data of features of a semiconductor substrate, the method (200) being implemented by a device comprising: - an imaging system (11, 13, 14, 16) having a depth of field, - a spatial phase mask (17) positioned in the aperture stop of the imaging system or in a conjugate plane of the aperture stop and configured to modulate the optical transfer function of the imaging system, and - an image sensor (12), wherein the modulated optical transfer function is adapted to extend the depth of field of the imaging system, the method (200) comprising the following steps: - acquiring (202) an image of a scene comprising at least a first feature of the semiconductor substrate in a first plane and a second feature of the semiconductor substrate in a second plane, the planes being perpendicular to an optical axis of the imaging system and separated by a distance greater than the depth of field of the imaging system; - detecting (204) the first feature of the semiconductor substrate and the second feature of the semiconductor substrate; - determining (206) relative lateral data of the first feature and the second feature. The invention also relates to a device implementing such a method.

An apparatus for checking a component with a periodic structure having substructures arranged on a lattice, the apparatus comprising a measurement radiation source for creating measurement radiation, an optics system, and a camera device. The apparatus further comprises a phase mask device for influencing a phase angle of the measurement radiation and / or an amplitude of the measurement radiation. The phase mask device comprises a dual lattice which is reciprocal to a target shape of the lattice.

This invention discloses a multi-image encryption method based on 3D face keys and multiplexed digital holography. The encryption steps include: using 3D face high-order data acquisition technology, chaotic face structured light phase mask generation technology, grating modulation technology, multiplexed digital holographic coding technology, and watermark embedding technology based on discrete wavelet domain singular value decomposition, multiple plaintext information images can be encrypted into an amplitude-type holographic ciphertext and embedded into a host image; the decryption steps include: the user must first calculate the face similarity using a 3D face multilayer perceptron neural network. If the similarity exceeds a preset threshold, authentication is successful. Then, the final decryption result is generated using watermark image extraction technology based on discrete wavelet transform, image decryption technology based on the Cramer-Kroni relation, and spectral filtering technology; otherwise, authentication fails. This method has advantages such as a large key space, high sensitivity, strong robustness of the 3D face key, and low decryption crosstalk.

This invention relates to the field of image encryption and discloses an optical image asymmetric encryption method based on nonnegative matrix factorization. The encryption method includes the following steps: S1, generating a preliminary encryption result through a first optical transformation based on the original image and a first random phase mask; S2, generating an encrypted result through a second optical transformation based on the preliminary encryption result and a second random phase mask; S3, performing nonnegative matrix factorization on the encrypted result to generate an image matrix and a coefficient matrix; S4, using the coefficient matrix as ciphertext and the image matrix as the private key to complete image encryption. This invention significantly improves the security of optical encryption. It combines nonnegative matrix factorization with double random phase coding to construct an asymmetric encryption mechanism that effectively resists known plaintext, chosen plaintext, and special attacks, while also being robust to cropping and noise interference. The framework is highly scalable and applicable to image and audio data encryption.

The invention relates to the technical field of optical imaging. The invention relates to an optical imaging system based on optical AI coding. The device comprises a mask plate adding unit, a blurred image unit, a phase parameter unit, an AI coding unit and a decoding restoration unit. The mask plate adding unit is used for acquiring a pupil specification, then adding a non-rotational symmetric phase mask plate at the pupil according to the pupil specification, and simulating the sensitivity of different parameter combinations to defocus aberration for the phase mask plate; a non-rotational symmetric phase mask plate is added at a pupil, a synergistic effect is formed in combination with an afocal phase modulation plate, target imaging can be carried out without zooming and focusing in a long dynamic range, meanwhile, the phase modulation depth of the phase mask plate and the mask size are completely matched with the specification of the pupil, and the imaging precision is improved. The afocal phase modulation plate adopts non-rotational symmetric phase distribution, and the matching of the afocal phase modulation plate and the afocal phase modulation plate can enhance the insensitivity of the system to image plane defocusing, so that the fuzzy modes of imaging at different defocusing positions in a large focal depth range are consistent.

A method, system, device, and medium for evaluating the image quality of a three-dimensional phase mask imaging system belong to the technical field of image quality evaluation methods for computational imaging systems and address the problem of low accuracy in image evaluation of three-dimensional phase mask imaging systems caused by existing evaluation methods. The method comprises obtaining a clear, uncoded image; obtaining a blurred, coded image; registering the clear, uncoded image and the blurred, coded image, obtaining the registered image and recording it as an image; processing the clear, uncoded image and recording it as an image; reconstructing the image, saving a region of the reconstructed image as an image, and determining, based on the temporary structural similarity between the recorded image and the image, the maximum structural similarity as the evaluation result of the three-dimensional phase mask coded imaging system.

This invention provides a method and apparatus for compressing and encrypting snapshots of multiple 3D color objects based on spatial division multiplexing. The method includes: generating an object beam and a reference beam based on a three-primary-color laser source, and generating multiple composite three-color parallel beams based on the object beam; illuminating each 3D color object and a random phase mask connected to each 3D color object with the multiple composite three-color parallel beams, respectively, and calculating the light field distribution of each 3D color object on the corresponding random phase mask plane; encrypting the light field distribution using each random phase mask, and generating an object light field on a detector plane based on the encrypted light field distribution; and generating an encrypted color hologram of multiple 3D color objects by interfering with the reference beam on the detector plane through the object light field and the reference beam. This method can significantly reduce the crosstalk effect during decoding of different encrypted objects, greatly reduce the leakage of object information, and significantly improve security.

A photon source for quantum communication including a plurality of optical channels, each comprising: a light emitter configured to emit optical pulses, and a phase mask optically connected to the respective light emitter and configured to encode an orbital angular momentum into incident light, wherein each of the phase masks of each optical channel is configured to encode a mutually orthogonal orbital angular momentum to the optical pulses emitted by the light emitter of each optical channel to provide an encoded optical output; a controller electrically coupled to each light emitter in each optical channel and configured to control parameters of the optical pulses; and combining optics configured to combine the encoded optical output of each of the optical channels to form a single encoded optical signal.

The invention relates to a single viewpoint imaging system for optically sectioning an object from a single viewpoint, comprising: (a) a TPNDBs (tilted pseudo-nondiffracting beams)-type coded phase mask (CPM) configured to receive a light beam passed through the object or reflected therefrom, and to produce TPNDBs directed towards a sensing array; (b) said sensing array configured to record an image formed by said TPNDBs impinged thereon; (c) a processor configured to: (c1) separately cross-correlating said recorded image with at least one point-spread function (PSF) previously acquired or calculated at the same system with the same CPM, each said PSF reflects a point object positioned at one specific longitudinal distance, respectively, from said array; (c2) storing the results of said separate cross-correlations, each such cross-correlation result relates to an image of another section, respectively, of the object; and (c3) uniting all said cross-correlation results to reconstruct a final image of the object.

Disclosed are a holographic display system using a rotating phase mask and an optimization method thereof. The holographic display system comprises: a light source unit for outputting laser light; a spatial light modulator for phase-modulating incident light; and a rotating phase mask for rotating a mask having a pattern adding a phase of a predetermined size, wherein the rotating phase mask is either located between the light source unit and the spatial light modulator or at the output terminal of the spatial light modulator.

A device with image acquisition includes: a first phase mask disposed at a front end of a display layer and configured to modulate external light; the display layer comprising pixel areas between hole areas through which the modulated light that has passed through the first phase mask passes; a second phase mask disposed at a rear end of the display layer and configured to modulate the modulated light that has passed through the first phase mask; an image sensor disposed at a rear end of the second phase mask and configured to generate a raw image by sensing the modulated light that has passed through the second phase mask; and a processor configured to perform image processing on the raw image, based on blur information corresponding to the raw image.

The invention discloses a coupling device and method for high-power energy optical fiber transmission, and belongs to the technical field of laser energy optical fiber transmission. The device comprises a high-power laser source module, a light beam conversion module and a multimode optical fiber module; the high-power laser source module is used for generating a plurality of input light beams; the light beam conversion module is used for receiving each input light beam and converting each input light beam into a combined light beam through a built-in phase plate group; wherein the phase plate group comprises a plurality of phase plates which are arranged according to a preset spacing distance; each phase plate is provided with a phase mask pattern; the phase mask pattern is determined through back propagation correction by generating calibration light beams for multiple times through the high-power laser source module; and the multimode optical fiber module is used for receiving and transmitting the combined light beam output by the light beam conversion module. Therefore, by implementing the invention, the problem of high cost of a device for high-power energy optical fiber transmission in the prior art can be solved.

The present invention provides a wavelength self-matching writing system and method for a cross-aligned fiber grating pair, which is used for simultaneously writing a high-reflection grating and a low-reflection grating with matching central wavelengths on a polarization-maintaining optical fiber to be written. The writing system includes a light source and a phase mask plate arranged in sequence along the light output direction. By arranging slow-axis matching regions and fast-axis matching regions of different periods on the phase mask plate, and matching the polarization-maintaining optical fiber to be written, which is composed of a cross-aligned first optical fiber segment and a second optical fiber segment, the first optical fiber segment is arranged corresponding to the slow-axis matching region, and the second optical fiber segment is arranged corresponding to the fast-axis matching region, the high-reflection grating and the low-reflection grating with matching central wavelengths can be simultaneously written on the polarization-maintaining optical fiber to be written, thereby eliminating the influence of uncertainty on the central wavelength of the grating, improving the yield rate, and reducing the difficulty of producing the fiber grating pair.

The invention discloses a calculation ghost imaging reconstruction method based on a Vision Transform and a U-Net network, and the method comprises the following steps: 1, enabling a Hadamard matrix of a cut cake sequence to serve as a phase mask, sequentially embedding the Hadamard matrix into a spatial light modulator, sequentially projecting the Hadamard matrix to a target image, and collecting a total light intensity sequence through a barrel detector; 2, partitioning the Hadamard matrix of the cake cutting sequence and the light intensity sequence, performing linear projection on each block to obtain a high-dimensional vector token, adding a position code to each high-dimensional vector token, inputting the high-dimensional vector token into a Transform encoder for processing, and converting the output into a two-dimensional matrix; and step 3, inputting the two-dimensional matrix obtained in the step 2 into the U-Net network to enhance transmission and fusion of feature information until a loss function of the ViT-U-Net network is kept stable, and obtaining a result of calculating ghost imaging. The image reconstructed by the method is high in quality and high in reconstruction efficiency.

The invention discloses a chirp grating spectrum shaping device and method, equipment, a storage medium and a product, and relates to the technical field of optical fibers. The small-hole diaphragm is arranged on an output light path of the laser and is used for filtering stray light of light spots; the reflecting mirror is arranged on the light emitting side of the small-hole diaphragm and is used for reflecting light rays; the linear displacement table is arranged on the supporting reflecting mirror, and the linear displacement table can move in the axial direction of the grating area; the cylindrical mirror is arranged on a reflex light path behind the reflecting mirror and is used for compressing the circular light spot into an elliptical light spot; the phase mask plate is arranged on the light emitting side of the cylindrical mirror and is used for forming a grating spectrum shape on the optical fiber core; and the control unit is electrically connected with the linear displacement table and is used for controlling the movement track of the linear displacement table so as to adjust the exposure doses at different positions of the grating region to realize chirp grating spectrum shape control. The optical fiber laser can adapt to different service scenes by adjusting the spectral shape of the grating.