235 results about "Optical diffraction" patented technology

The invention provides a high-speed defect identification method and system based on optical diffraction imaging, and relates to the technical field of optics, and the method comprises the following steps: constructing a composite optical diffraction unit comprising a programmable optical metasurface and a quantum phase modulator, optimizing and determining modulation characteristics through a multi-target constraint function, and collecting a quantum coding diffraction image. The quantum state phase reconstruction network is used for processing the image and extracting characteristic parameters, and a result is obtained through analysis of a defect identification model. According to the invention, rapid defect identification with high spatial resolution is realized, and the detection efficiency and accuracy are improved.

The invention provides a beam forming system which can be applied to the fields of wireless communication systems, automatic driving, artificial intelligence and the like. And small-scale, low-power-consumption and fast-response two-dimensional beam forming can be realized. The system comprises a first optical diffraction module and an array of second optical diffraction modules, the first optical diffraction module comprising at least one input port and a plurality of output ports, each second optical diffraction module in the array of second optical diffraction modules comprising one input port and a plurality of output ports. The first optical diffraction module is used for receiving at least one path of first signal light and generating multiple paths of second signal light with different phases based on the at least one path of first signal light. Each second optical diffraction module is used for receiving one path of second signal light in the multiple paths of second signal light and generating multiple paths of third signal light with different phases based on one path of second signal light, and the multiple paths of third signal light are used for generating multiple paths of first radio frequency signals.

Methods, apparatus, devices, subsystems, and systems for holographically displaying three-dimensional objects are provided. In one aspect, an optical device includes: a first optically diffractive component including a first diffractive structure configured to diffract a first color of light having a first incident angle at a first diffracted angle, a second optically diffractive component including a second diffractive structure configured to diffract a second color of light having a second incident angle at a second diffracted angle, a first reflective layer configured to totally reflect the first color of light having the first incident angle and transmit the second color of light, and a second reflective layer configured to totally reflect the second color of light having the second incident angle. The first reflective layer is between the first and second diffractive structures, and the second diffractive structure is between the first and second reflective layers.

The invention discloses an optimization method of an optical diffraction neural network, which is characterized in that a multi-target loss function is designed in combination with classification reasoning performance and diffraction efficiency performance, and diffraction layer phase parameter distribution of the optical neural network is jointly optimized, so that the diffraction efficiency of the trained optical diffraction neural network is greatly improved. Compared with a traditional cross entropy loss function training method, the method has the advantages that the loss function of the diffraction efficiency performance is added on the basis of the cross entropy loss function of the original classification performance, and the diffraction efficiency of the optical diffraction neural network is greatly improved. The trained optical diffraction neural network alleviates the problem of spurious distribution of an output plane field, has high signal contrast, enhances the robustness of the system, and further promotes the application of the optical diffraction neural network in an actual image classification scene.

The invention discloses a spatial diffraction deep neural network asymmetric multifunctional imaging method and system, and is suitable for the field of optical signal processing. The system is composed of a signal input module, an all-optical diffraction neural network module and a signal acquisition module. The signal input module is responsible for providing a light source and a modulation element and is used for generating and modulating a light field signal. And the all-optical diffraction neural network module adopts a double-loss function optimization strategy to carry out asymmetric training. Specifically, different loss functions are introduced in different transmission directions to train different functions at the same time, so that diversified processing of signals is realized. And the signal acquisition module is responsible for acquiring and storing a final calculation result. Different imaging functions can be realized according to different signal input directions, so that diversified requirements of optical signal processing are met, the blank of related fields is filled, and a brand new thought is provided for further research and application of the optical imaging field.

The invention discloses a laser scanning device based on light spot switching, additive manufacturing equipment and a method of the laser scanning device. The laser scanning device comprises a laser device, a collimator and a galvanometer system, wherein the power of the laser device can be adjusted within the range of 5w-30000w; an optical diffraction device is arranged between the collimator and the galvanometer system and used for achieving rapid switching of a first light spot and a second light spot so as to print a workpiece, the first light spot is a Gaussian light spot and used for printing the outer contour of the workpiece, the corresponding printing layer thickness is h1, the second light spot is a shaping light spot and used for printing a filling area of the workpiece, and the corresponding printing layer thickness is h2; the switching speed of the first light spot and the second light spot does not exceed 200 milliseconds. The optical diffraction device is arranged between the collimator and the galvanometer, rapid switching between the high-power shaping light spot and the low-power Gaussian light spot is achieved, the Gaussian light spot is adopted for printing the small-layer-thickness contour, the shaping light spot is adopted for printing the large-layer-thickness filling, and therefore on the premise that the printing quality of a workpiece is guaranteed, the production efficiency is improved. And the printing efficiency is greatly improved.

Snapshot phase-shifting diffraction modules and associated systems and methods are described that enable high spatial and temporal resolution phase imaging with high immunity to environmental factors such as vibrations and temperature changes. One example optical diffraction phase module includes a polarization grating to produce two circularly polarized light beams with opposite polarizations, a first lens to receive the two circularly polarized beams, and a spatial filter positioned at a focal plane of the first lens. The spatial filter includes two openings, one to spatially filter one of the two circularly polarized light beams, and another opening to allow another circularly polarized light beam to pass. The module also includes a second lens to focus the received light onto an image plane and to enable a phase measurement based a plurality of interferograms. The phase module can be incorporated into a microscope system that operates a reflection or a transmission mode.

The invention discloses an all-optical vortex beam orbital angular momentum mode identification method and system, and relates to the field of optical information processing and optical computing, and the method comprises the steps: S1, constructing a multi-layer architecture all-optical diffraction network; s2, dividing the output detection surface after the diffraction network into a plurality of preset space regions; s3, the vortex light beams carrying orbital angular momentum OAM information sequentially penetrate through the all-optical diffraction network, spatial evolution of a light field in the propagation process is completed, and vortex light classified according to intensity distribution is output; s4, mapping the topological charges of the vortex light to different sub-regions of the detection surface in an intensity distribution form; and S5, performing intensity acquisition on each area on the detection surface through a detector, and determining an OAM mode type of the input light field based on the mode number corresponding to the area with the maximum light intensity. The method is used for performing high-robustness identification on the orbital angular momentum vortex light mode of the vortex light in the presence of a random phase scattering medium.

Methods, apparatus, devices, and systems for displaying three-dimensional objects by individually diffracting different colors of light are provided. In one aspect, an optical device includes: a first optically diffractive component including a first diffractive structure configured to diffract a first color of light having a first incident angle at a first diffracted angle, a second optically diffractive component including a second diffractive structure configured to diffract a second color of light having a second incident angle at a second diffracted angle, a first reflective layer configured to totally reflect the first color of light having the first incident angle and transmit the second color of light, and a second reflective layer configured to totally reflect the second color of light having the second incident angle. The first reflective layer is between the first and second diffractive structures, and the second diffractive structure is between the first and second reflective layers.

The invention belongs to the technical field of optical calculation, and discloses an error-adaptive optical diffraction neural network in-situ training method, which comprises the following steps: based on the phase of each phase modulation layer, calculating the light field complex amplitude Uk of the input sample complex amplitude on the rear surface of each phase modulation layer and the light field complex amplitude Uo of the input sample complex amplitude on an output plane after forward propagation; calculating an error light field P based on Uo, carrying out three-dimensional central symmetry on a back propagation light path of the error light field P without changing the phase distribution of each phase modulation layer, and calculating the light field complex amplitude of the complex amplitude of the symmetrical error light field on the front surface of each phase modulation layer after forward propagation; the method comprises the steps of obtaining the light field complex amplitude Un + 1-k'of P back propagation to the rear surface of each phase modulation layer, calculating the gradient related to a loss function based on Uk and Un + 1-k 'so as to carry out updating, and carrying out the next round of training until a preset training round or loss convergence is reached. The method can adapt to errors existing in an optical system.

The invention discloses a scanning structured light microscopic imaging method and system, and the method comprises the steps: generating a vortex structured light field with spiral phase distribution according to the three-dimensional morphology characteristics of a target sample, synchronously collecting a reflection signal and a fluorescence signal, and obtaining a multi-mode excitation light field data set; performing multi-modal signal fusion processing according to the multi-modal excitation light field data set to generate a multi-dimensional fusion feature map; and according to the multi-dimensional fusion feature map, performing three-dimensional image reconstruction processing by adopting a physical model constrained compressed sensing reconstruction algorithm and combining prior topological information of the sample, and inhibiting motion artifacts and optical diffraction noise through a dynamic sparse base optimization technology to obtain an artifact-inhibited high-resolution microscopic image. According to the embodiment of the invention, motion artifacts and optical diffraction noise can be effectively inhibited, and high-resolution microscopic images can be obtained.

The present disclosure relates to the technical field of optical computing, and particularly relates to an intelligent optical computing chip cluster architecture and system. The architecture comprises: a plurality of optical computing chips, and optical path channels are established between the plurality of optical computing chips by using spatial phase adjustment to modulate light beams; and high-speed optical communication and optical diffraction network computing are performed between the plurality of optical computing chips by performing time-domain intensity modulation on the optical path channels. The present disclosure adopting the above scheme can realize the interconnection computing of optical computing chips in the spatial dimension, and does not rely on electricity for information transmission.

The invention relates to a multi-wavelength optical secret sharing system and method based on an optical diffraction neural network. The multi-wavelength optical secret sharing system comprises an input layer module, a modulation layer module and an output layer module which are connected in sequence. The input layer module is used for generating incident light beams with different wavelengths; the modulation layer module is used for carrying out phase modulation on an incident light beam and encrypting to-be-transmitted information split into a plurality of target images through optical diffraction calculation, the modulation layer module comprises a plurality of modulation layers, the on-off state of each modulation layer is independently controllable, and the modulation layer is used for carrying out phase modulation on the to-be-transmitted information. The trained modulation layer module can generate a unique corresponding secret key for each target image, and each secret key comprises the wavelength of an incident beam and the on-off state of each modulation layer; and the output layer module is used for reproducing the split information to be transmitted to realize optical secret sharing, the output layer module comprises a plurality of output planes, and each output plane is used for reproducing a corresponding target image according to different key combinations. Compared with the prior art, the security and capacity of information transmission can be further improved.

The invention discloses an optical diffraction element defect detection method and system based on deep learning and a medium. The method comprises the following steps: acquiring a first to-be-detected image, preprocessing the first to-be-detected image to obtain a first ROI sub-image of the first to-be-detected image, and establishing a geometric rectangular coordinate system; a first deep learning model deployed in advance is loaded to perform semantic segmentation on the first ROI subgraph, the first deep learning model is used for identifying the first dispensing area and outputting a first feature graph, the first deep learning model is based on a Unit + + network structure, and a multi-scale large-kernel convolution module is adopted by both an encoder and a decoder of the first deep learning model; detecting a first defect in the first ROI sub-graph by adopting a first 2D traditional algorithm; the first feature map detects a second defect and a third defect by using a second 2D traditional algorithm. According to the method, a deep learning algorithm is combined with a 2D traditional algorithm, so that the detection speed and accuracy of the optical diffraction element can be improved.

The application discloses a kind of low-quality image super-resolution reconstruction methods based on adversarial generative network, including, with the generation dynamic point diffusion function of differentiable optical diffraction calculation layer, and based on the function, wavefront aberration dynamic compensation mechanism is established, wavefront aberration is predicted and compensated, and the low-resolution input feature of optimization is obtained;According to the optimization feature, generator and discriminator are trained using physical constraint adversarial training strategy, and high-resolution image conforming to optical physical law is generated;The diffraction characteristics of high-resolution image are optimized through multi-scale diffraction consistency verification module, to ensure the physical authenticity and consistency of image under different resolutions;The application can effectively handle the complex degradation characteristics of low-quality image, improve the detail quality and optical rationality of generated image.

The invention provides an optical diffraction tomography resolving method, device and equipment, and belongs to the technical field of optical diffraction tomography. The method comprises the following steps: acquiring an off-axis interference image of a target sample; preprocessing the off-axis interference image to obtain a target refractive index distribution diagram; and taking the target refractive index distribution diagram as input, carrying out iterative reconstruction on the refractive index distribution condition of the target sample through a preset algorithm until the difference between a theoretical scattered field calculated based on the refractive index distribution condition and an actual scattered field measured by an experiment meets a preset condition, and obtaining a resolving result diagram, the preset algorithm is generated by combining total variation regularization and a beam propagation method, and is realized by using a GPU (Graphics Processing Unit) under CUDA (Compute Unified Device Architecture). High-precision and high-efficiency recovery of the three-dimensional refractive index of a sample is realized, and the resolving efficiency and accuracy of optical diffraction tomography are improved.

The invention discloses a light field display method and system with holography as a representation medium, and the method comprises the following steps: S1, collecting a multi-view image of a target scene, carrying out the coding of the multi-view image, and generating a light field tensor containing space and angle information; s2, mapping the light field tensor in the step S1 into a two-dimensional space phase diagram; s3, converting the two-dimensional space phase diagram in the step S2 into a modulation diagram used for driving a spatial light modulator; and S4, driving the spatial light modulator to perform light wavefront modulation according to the modulation graph in the step S3, and reproducing the image of the target scene through optical diffraction. According to the invention, integration from dynamic scene information acquisition to high-quality three-dimensional image reproduction is realized, a low-redundancy and high-fidelity processing link is realized, and the efficiency and quality of holographic display are greatly improved.

The invention belongs to the field of molecular sieve material characterization, and particularly relates to a method for analyzing aluminum atom pairs in a ZSM-5 molecular sieve based on super-resolution fluorescence microscopic imaging, which comprises the following steps: activating a ZSM-5 molecular sieve sample; contacting the obtained sample with probe molecules; washing the ZSM-5 molecular sieve sample, and removing unbound or nonspecifically bound probe molecules; imaging the marked sample by using a super-resolution fluorescence microscope to obtain an image sequence containing a single fluorescent molecule emission event; processing the image sequence, determining a space coordinate of each fluorescence event, and reconstructing a super-resolution fluorescence image exceeding an optical diffraction limit; and based on the space coordinates of the fluorescent dots in the super-resolution fluorescence image, carrying out statistics to obtain the position, surface density or distribution information of the aluminum atom pairs in the ZSM-5 molecular sieve. According to the method disclosed by the invention, nanoscale spatial resolution, direct imaging and quantitative analysis of Al-pair in ZSM-5 (Zeolite Socony Mobil-5) can be realized.

The embodiment of the invention provides an eyeball tracking system, an eyeball tracking method and intelligent head-mounted equipment. The eyeball tracking system is applied to the intelligent head-mounted equipment and comprises a projector, a receiving camera and a processor, the number of the projectors is at least one, each projector comprises a light source and an optical diffraction element, the light source is obliquely arranged, a set inclination angle theta is formed between the light source and a plane where eyeballs of a wearer are located, 25 degrees < = theta < = 35 degrees, and the optical diffraction element is located on a light emitting path of the light source. The light field module is used for forming a uniform light field covering a specific eye area at a set distance from eyeballs of a wearer; the receiving camera and the projector are correspondingly arranged, and the receiving camera is used for acquiring an eye image which is reflected by an eyeball and is formed by the optical diffraction element in a uniform light field; and the processor is used for determining pupil center position information of the wearer according to the eye image so as to obtain a fixation point of the eyes of the wearer.

The invention discloses a method for improving optical storage performance by superposing and rewriting a Type X structure based on femtosecond laser direct writing, and belongs to the technical field of optical storage, and the method comprises the steps: 1, determining a processing parameter window of the Type X structure; 2, determining a seed pulse parameter and a write-in pulse parameter; 3, random data writing and reading are carried out; according to the method, the storage points are superposed and rewritten by utilizing the erasable rewriting characteristic of the Type X, so that the limitation of optical diffraction limit can be bypassed, the storage capacity of the femtosecond laser permanent optical storage technology is improved by at least one order of magnitude, the number of pulses required by each storage point can be reduced, and the data writing speed is improved.

The utility model discloses a seamless moulding press, and particularly relates to the technical field of packaging film production, the seamless moulding press comprises a supporting seat, the left side and the right side of the front part of the upper end of the supporting seat are both connected with supporting plates, and the upper part and the lower part between the opposite surfaces of the two supporting plates are both rotatably connected with an unwinding roller; the front side of the middle of the upper end of the supporting seat is fixedly connected with a tension adjusting mechanism, the middle of the upper end of the supporting seat is fixedly connected with a deviation rectifying mechanism, the rear side of the middle of the upper end of the supporting seat is fixedly connected with a mold pressing assembly, and the rear side of the upper end of the supporting seat is fixedly connected with a winding assembly. According to the plate-seam-free molding press, the tension of a film material can be detected and adjusted in real time through the arranged tension adjusting mechanism, it is ensured that the film material is accurately attached to the holographic roller, pattern ghosting, blurring or microstructure deformation caused by stretching or loosening of the film material is avoided, and therefore the consistency of the optical diffraction effect of an anti-fake pattern is effectively improved.

The invention discloses a low-quality image super-resolution reconstruction method based on a generative adversarial network, and the method comprises the steps: generating a dynamic point spread function through a differentiable optical diffraction calculation layer, building a wavefront aberration dynamic compensation mechanism based on the dynamic point spread function, predicting and compensating wavefront aberration, and obtaining optimized low-resolution input features; according to the optimization features, training a generator and a discriminator by adopting a physical constraint adversarial training strategy, and generating a high-resolution image conforming to an optical physical rule; the diffraction characteristic of a high-resolution image is optimized through a multi-scale diffraction consistency verification module, and the physical authenticity and consistency of the image under different resolutions are ensured; according to the invention, the complex degradation characteristic of the low-quality image can be effectively processed, and the detail quality and optical rationality of the generated image are improved.

According to the method, a cavity black body and a diaphragm hole form an infrared light source, coarse adjustment of a two-dimensional displacement mechanism and fine adjustment of a three-dimensional high-precision displacement mechanism are combined, and an imaging optical system and a narrow-band filter are matched, so that the crosstalk test of a detector with the pixel spacing of 15 microns and below is realized. Through multi-area sampling, multi-band coverage testing and weighted average data processing, the problem that a traditional small-light-spot system is limited by optical diffraction limits is effectively solved, the testing accuracy is remarkably improved, the deficiency of a crosstalk detection method of a small-pixel infrared focal plane detector is overcome, detector evaluation means are enriched, and the detection efficiency is improved. The method is suitable for performance evaluation of infrared imaging system core devices.

The invention relates to the technical field of microscopic imaging, and provides a bimodal imaging system, an imaging method, a device and a storage medium, and the method comprises the steps: generating two laser beams as illumination light and reference light respectively; in the light intensity diffraction tomography mode, lighting light is turned on, the electric diaphragm is turned off to block the reference light, the lighting light passes through an imaging objective lens switched into a low-power objective lens in a first path, and a light intensity diffraction tomography image of the sample is obtained; lighting light is turned on in the optical diffraction tomography mode, an electric diaphragm is turned on to enable the reference light to be propagated along a second path, the lighting light passes through an imaging objective lens switched into a high-power objective lens in a first path, and an optical diffraction tomography image of the sample is obtained; bimodal microscopic imaging is realized based on the light intensity diffraction tomography image and the optical diffraction tomography image; the bimodal imaging system disclosed by the invention is integrated in a set of light path system, and unmarked refractive index imaging of global appearance and local characteristics of a sample can be realized by switching different modes under the control of the subsystem, so that bimodal microscopic imaging is realized.

The utility model discloses an angle magnification optical diffraction experiment device. Comprising a one-dimensional optical slide rail, and a helium-neon laser, a one-dimensional arrangement lens group and a receiving measurement assembly which are sequentially arranged at intervals along an optical axis from an object side to an image side, and samples used for diffraction experiments are arranged among lenses in the one-dimensional arrangement lens group along the optical axis direction. The one-dimensional arrangement lens group, the receiving and measuring assembly and the sample are slidably mounted on the one-dimensional optical slide rail; and the helium-neon laser and the one-dimensional optical slide rail are both arranged on the top surface of the optical platform. According to the utility model, through the beam expanding light path and the angle amplification light path which are formed by the lens group, the diameter of the laser beam and the diffraction angle are respectively enlarged, so that diffraction spots of a macroscopic object are clearly visible on a naked eye resolution scale, the device can be used for displaying diffraction and interference phenomena of various large-size structures, and the whole set of device is simple, compact and convenient to use. The device is clear in structure, has high flexibility, and can be widely applied to physical optical experiment teaching.

The invention discloses an ultrahigh space-time resolution detection imaging method and system, and relates to the technical field of optics, and the method comprises the following steps: carrying out the photon space-time dynamic modulation of multi-wavelength short-short pulse laser, and enabling the number of photons in a single-pulse local irradiation field to be in a single-photon / few-photon state; the patterned photons subjected to photon space-time dynamic modulation are distributed and miniaturized to a sample containing fluorescent molecules for double / multi-photon excitation under few-photon irradiation, and double / multi-photon fluorescence is collected; through a high temporal-spatial resolution detection means, spectral information, life information and spatial position information of dual / multiphoton fluorescence are obtained, fluorescence information in a field of view is reconstructed, and super-resolution imaging and positioning of the whole field of view are completed. According to the invention, large-view-field, high-frame-frequency and super-resolution fluorescence detection imaging can be realized, and opportunities are provided for solving the major scientific problem of optical diffraction limit and realizing super-resolution fluorescence microscopy technology innovation.

The invention discloses a space customization three-dimensional column vector light beam array generation method based on a metasurface, and belongs to the field of micro-nano optics, diffraction optics and structured light field regulation and control. The implementation method comprises the following steps of: independently regulating and controlling left-hand circular polarization and right-hand circular polarization components of incident light based on geometric and propagation phase joint modulation of the metasurface; a metasurface, a phase distribution coding lens factor of a polarization channel, a Dammann vortex grating with opposite basic topological charges and a spiral Dammann zone plate are independently optimized, and left-handed and right-handed circular polarization components generate a three-dimensional vortex beam array with opposite spatial topological charges in a near-field Fresnel domain; the left-handed circular polarization vortex array and the right-handed circular polarization vortex array with opposite topological charges are coherently superposed to form a spatially customized three-dimensional column vector light beam array, and the vector characteristic of each light beam in the array depends on the amplitude ratio, the phase difference and the topological charges of the left-handed circular polarization component and the right-handed circular polarization component on each diffraction order. According to the invention, the regulation dimension of the column vector light beam can be expanded.

The invention discloses a super-diffraction dark spot microscopic imaging method based on nonlinear focal spot competition. The hollow light beams with different wavelengths are subjected to incoherent overlapping in a focus area, the double hollow light beams generate excitation photon nonlinear absorption competition in a fluorophore peripheral overlapping area, super-diffraction dark spots are finally generated in a focal plane, and stable fluorescence signals are formed in a small-size signal detection area. A target signal is extracted through a weak signal locking amplification technology. The optical diffraction limit is broken through, so that high-precision positioning of the to-be-observed object in the diffraction limit area becomes possible. The optical power needed by the system is low, the detection sensitivity is high, the device structure is simple, and the system is suitable for high-resolution observation in the fields of biomedicine, nano materials and the like.

The invention relates to the field of optical diffraction, and provides a reflective grating blank, a manufacturing method and a detection system thereof, the reflective grating blank comprises a semi-transparent layer and a reflective layer, the semi-transparent layer is parallel to the reflective layer, the semi-transparent layer comprises a plurality of parallel lines which are arranged at equal intervals, and when a light beam irradiates the surface of the semi-transparent layer, the parallel lines are parallel to the semi-transparent layer. The lines transmit part of light beams and reflect other light beams, the light beams transmitting the semi-transparent layer irradiate the reflecting layer, and the reflecting layer reflects all the light beams. By adopting the reflective grating blank, the resolution ratio of grating pitch measurement can be greatly improved.

To provide an optoelectronic device.SOLUTION: An optoelectronic device comprises a plurality of light transmissive regions extending through the device along a first axis and allowing light to pass through. The transmissive regions may be arranged along a plurality of transverse configuration axes. Emissive regions may be positioned between adjacent transmissive regions along a plurality of configuration axes to emit light from the device. Each transmissive region has a lateral closed boundary having a shape to alter at least one characteristic of a diffraction pattern indicated when the light is transmitted through the device to mitigate interference by the pattern. An opaque coating may include at least one aperture defining a corresponding transmissive region to prevent transmission of light which is transmitted through the opaque coating other than through the transmissive region(s). The device can form a face of a user device having a body and housing a transceiver disposed to receive light along at least one light transmissive region.SELECTED DRAWING: Figure 1