12 results about "Multiple diffraction" patented technology

This invention relates to the field of optical detection technology, specifically a multifocal parallel phase extraction and alignment system based on a spatial light modulator, comprising: a wavefront modulation module, a parallel detection module, an information extraction module, a parameter calculation module, and a correction and execution module. The wavefront modulation module loads a phase modulation pattern through a spatial light modulator, generating a complex wavefront containing multiple diffraction orders via the objective lens, forming multiple spatially separated detection focal spots on the sample surface. The parallel detection module receives the reflected light signals from each focal spot in parallel through an array detector. The information extraction module analyzes the signals and extracts the phase offset of each focal spot, constructing a mapping set between position and phase offset. The parameter calculation module calculates the tilt angle and field curvature distribution parameters based on this set. The correction and execution module generates a comprehensive correction signal to drive the objective lens or sample stage to perform multidimensional attitude adjustments. This system achieves multifocal parallel detection and synchronous parameter calculation, improving alignment efficiency and accuracy.

A multi-voltage phase recovery device and method based on a photorefractive effect are characterized in that the photorefractive effect is utilized to replace a non-linear effect under a strong light condition, diffraction images after an optical system under different non-linear effect degrees are collected through a photoelectric detector, a reconstruction algorithm based on non-linear inversion is used, and a multi-voltage phase recovery model is obtained. Reconstructing amplitude and phase information of the sample to be measured; compared with a traditional linear multi-plane phase recovery method, the method has the advantages that the multiple diffraction images can be obtained only by changing the voltage without mechanical displacement, the axial mechanical displacement error and the transverse alignment error of the multiple images can be avoided, and therefore the precision is higher, and the convergence speed is higher.

The application provides an image recognition simulation model and system, the image recognition simulation model comprising: an optical diffraction neural network for a handwritten digit recognition task, the optical diffraction neural network comprising: an input layer, a diffraction layer and an output layer; the input layer modulates incident light into a wavefront array carrying image information; the diffraction layer performs multiple diffractions on the light output by the input layer to simulate a convolution weight matrix, and adjusts a phase distribution in a manner of error back propagation; and the output layer generates a focused light spot corresponding to the number of categories, the focused light spot focusing on a number corresponding to a plurality of detection points, and a detection surface light spot intensity distribution of the focused light spot is used to represent a classification probability. Through nano structure design, high degree of freedom regulation of light field amplitude, phase and polarization is realized in a two-dimensional plane; meanwhile, through multi-layer cascading extension network depth, feature abstraction capability is improved, nonlinear mapping is realized through multi-layer cascading diffraction, and a classification light intensity distribution is directly output, and the light intensity distribution represents a classification result.

The embodiment of the application discloses a kind of multi-node structure light field generation devices with interactive network characteristics, including transparent substrate and multiple diffraction modulation units, diffraction modulation unit is sheet fork grating, the number of sheet fork grating is at least three pieces, sheet fork grating is integrated and engraved on the surface of transparent substrate by laser direct writing technology, each sheet fork grating has independent light field phase modulation function, from the first engraved sheet fork grating, from below to above, each sheet fork grating is rotated around the axis in the same direction relative to the sheet fork grating of adjacent lower piece, and a constant misregistration angle is generated, the misregistration angle refers to the relative rotation angle between two adjacent sheet fork gratings, the product of the number of sheet fork gratings and misregistration angle is less than or equal to 360 °, the advantage is that multi-node structure light field with interactive network characteristics can be realized in high-dimensional parameter space, and the types and complexity of the generated light field are enriched.

The invention discloses a vehicle-mounted holographic display device and method and a vehicle, and belongs to the technical field of optics. The vehicle-mounted holographic display device comprises a holographic module, a projection module and a control module; the holographic module is provided with a plurality of diffraction structure units, and at least two diffraction structure units are configured to diffract incident light to different positions; the projection module comprises a plurality of light outlets, and the at least two light outlets are configured to emit light beams with different incident angles to the at least two diffraction structure units respectively; the control module is in communication connection with the projection module, and the control module is configured to control opening and closing of the multiple light outlets. Switching of privacy and sharing modes is realized in the same area by controlling opening and closing of a light outlet, light is accurately projected to human eyes by utilizing a holographic module, energy is prevented from being scattered to a depopulated area, brightness in the eyes is improved, energy consumption is reduced, the contradiction between driving safety and parking entertainment is solved, the use frequency of projection entertainment is improved, and meanwhile, the driving safety is improved. And the driving safety during driving is ensured.

The invention discloses a multi-view machine vision system based on a two-dimensional grating and a use method, and the system comprises an optical imaging module which is used for converging light field information of a target; the two-dimensional grating is used for enabling the converged light field to form a multi-stage diffraction image on an image plane; the plurality of image acquisition modules are used for recording the intensities of different diffraction order light fields of the two-dimensional grating to obtain a plurality of images with parallax information; and the image analysis and processing module is used for processing the acquired image to obtain parallax information of the target. According to the multi-view machine vision system, multi-view vision information with parallax can be obtained only through one imaging system, angle information of a target is obtained while the spatial resolution of the system is not reduced, the problem that the spatial resolution and the angle resolution of a traditional multi-view vision system are mutually restricted is solved, the two-dimensional grating machining technology is simple, and the machining cost is low. The system structure is simplified, the reliability is improved, and the cost is reduced.

The utility model relates to a multi-view display structure and an AR (Augmented Reality) system. The multi-view display structure comprises a laser scanning light source, a collimation light splitting element and a holographic optical element, the holographic optical element is arranged on the light emitting side of the laser scanning light source, and the collimation light splitting element is arranged in a light path between the laser scanning light source and the holographic optical element; the laser scanning light source is used for emitting scanning beams; the collimating and light splitting element is used for collimating a scanning light beam of the laser scanning light source and splitting the collimated light beam into light beams with a plurality of diffraction orders; the holographic optical element is used for respectively focusing the light beams of the plurality of diffraction orders to a plurality of discrete viewpoints; the collimation light splitting element copies a single beam of light emitted by the laser scanning light source into multiple beams of parallel light, and each diffraction order corresponds to an independent viewpoint, so that the number of exposure times required during preparation of the holographic optical element is reduced, an exposure light path is simple in design and convenient to construct, and the production difficulty and cost of a multi-viewpoint display structure are effectively reduced.

The embodiment of the invention discloses a multi-node structure light field generation device with interactive network characteristics, which comprises a transparent substrate and a plurality of diffraction modulation units, the diffraction modulation units are at least three sheet-shaped fork-shaped gratings, and the number of the sheet-shaped fork-shaped gratings is larger than that of the transparent substrate. The sheet-shaped fork-shaped gratings are integrally inscribed on the surface of the transparent substrate through a laser direct writing technology, each sheet-shaped fork-shaped grating has an independent light field phase modulation function, and from the sheet-shaped fork-shaped grating inscribed for the first time, each sheet-shaped fork-shaped grating has an independent light field phase modulation function relative to the adjacent lower sheet-shaped fork-shaped grating from bottom to top; the sheet-shaped fork-shaped gratings rotate around a shaft in the same direction to generate a constant dislocation angle, the dislocation angle refers to the relative rotation angle between two adjacent sheet-shaped fork-shaped gratings, and the product of the number of the sheet-shaped fork-shaped gratings and the dislocation angle is smaller than or equal to 360 degrees. And the types and complexity of the generated light field are enriched.

This invention discloses a metaholographic device and its design and imaging methods, belonging to the field of micro-nano photonics technology. The design method of the metaholographic device includes: obtaining the phase modulation amount of the target metaholographic device to be designed for each order of diffraction light, and then calculating the displacement distribution Δ of the metaunit along the x-direction. x (x,y) and displacement distribution Δ along the y direction y (x,y); each of the superunits is distributed according to the displacement along the x and y directions (Δ). x (x,y),Δ y A two-dimensional nanostructure array is obtained by displacement of (x, y), and then the two-dimensional nanostructure array is placed on the preset surface of the transparent substrate to obtain a meta-holographic device for multi-channel imaging. This meta-holographic device has a wide operating bandwidth and achieves multi-channel holographic imaging by multiplexing multiple diffraction orders under incident light of different wavelengths and preset total reflection angles.

The application discloses an optical neural network device and an optical device, and belongs to the technical field of optical chips, and comprises a waveguide structure, the waveguide structure is used for propagating an optical signal; at least one first diffraction structure; at least one second diffraction structure; the first diffraction structure and the second diffraction structure are integrally formed with the waveguide structure, and the first diffraction structure and the second diffraction structure are used for adjusting at least one of phases, intensities, directions, polarizations and modes of the optical signal; the optical signal enters the waveguide structure through the first diffraction structure, the optical signal processed by the first diffraction structure is transmitted to the second diffraction structure, and the optical signal processed by the second diffraction structure is emitted from the waveguide structure. The application sets multiple diffraction structures on the waveguide structure, and the multiple diffraction structures are integrally formed with the waveguide structure, so that the optical path transmission of the optical neural network device is more stable.

This invention provides a method, apparatus, device, and storage medium for generating cell motion trajectory curves. The method includes: acquiring multiple diffraction ring images of microspheres engulfed by cells; determining multiple three-dimensional coordinates of the microspheres based on the multiple diffraction ring images; determining the multiple three-dimensional coordinates of the microspheres as multiple three-dimensional coordinates of the cell; and generating a three-dimensional motion trajectory curve of the cell based on the multiple three-dimensional coordinates of the cell. This allows for the acquisition of multiple diffraction ring images of microspheres engulfed by cells and the automatic determination of multiple three-dimensional coordinates of the microspheres in the multiple diffraction ring images. Because the cell engulfs the microspheres, the microspheres are subject to dual constraints from the cell's cytoskeleton and cell membrane, allowing the microspheres to effectively track and reproduce changes in cell motion. The three-dimensional motion trajectory curve of the cell more realistically reflects changes in cell motion in three-dimensional space, increasing the realism of the cell motion changes reflected by the three-dimensional motion trajectory curve.

The invention discloses projection equipment. The projection equipment comprises a laser, an imaging system and a display element, the laser comprises a plurality of laser chips and diffractive optical elements located on the light emitting sides of the laser chips. Light beams emitted by the plurality of laser chips form a plurality of light spots on the diffractive optical element, the diffractive optical element comprises a plurality of diffractive units, and one diffractive unit corresponds to one light spot; the imaging system is located on the light-emitting side of the laser. Light beams emitted by the diffraction units form a plurality of rectangular light spots between the laser and the imaging system, and the number of the rectangular light spots is equal to the number of light spots formed on the diffraction optical element by the light beams emitted by the laser chip; the display element is located on the light emitting side of the imaging system, the imaging system images the light beams emitted by the diffraction units on the light receiving face of the display element, and imaging light spots of the light beams emitted by the diffraction units coincide. The diffractive optical element is matched with the imaging system and has the functions of dodging, shaping and combining light, and the internal structure of the projection equipment can be simplified.