47 results about "Optical propagation" patented technology

The invention discloses an underwater image de-scattering method, system and device for scattering field decoupling in the technical field of underwater optical imaging and computer vision, and the method comprises the steps: calculating an intensity graph and a scene linear polarization degree graph according to an obtained multi-scale underwater image; according to the intensity image, performing image signal decomposition by using a dynamically constrained background light separation model to obtain a background scattering component and a target feature component; according to the scene linear polarization degree map and the background scattering component, calculating fusion transmissivity according to a non-linear optical transmission equation; carrying out noise suppression processing on the fusion transmissivity by adopting a double-constraint optimization architecture to obtain the fusion transmissivity subjected to noise suppression processing; and performing image reconstruction through a reverse optical propagation model according to the fusion transmissivity and the target feature component subjected to noise suppression processing to obtain a scattering-removed underwater image. The method effectively breaks through the dependence of a traditional method on the uniform hypothesis of a scattered field, and provides high-precision visual restoration support for an underwater detection task.

The invention discloses a wavefront detection-free adaptive optical correction method and system, and the method comprises the steps: obtaining a real in-focus image and a real out-of-focus image of a to-be-corrected light beam, and outputting an updated deformable mirror control voltage through a physical information neural network; generating a predicted wavefront phase according to the deformable mirror control voltage signal and a deformable mirror voltage-phase mapping model; generating a predicted in-focus image and a predicted out-of-focus image through a derivable Fourier optical propagation model; constructing a label-free composite loss function according to the real in-focus image, the real out-of-focus image, the predicted in-focus image and the predicted out-of-focus image; performing unsupervised training updating on the physical information neural network according to the composite loss function, and performing repeated iteration to obtain an optimized deformable mirror control voltage; and driving the deformable mirror to carry out self-adaptive optical correction in real time according to the optimized deformable mirror control voltage to obtain a correction result. According to the invention, the correction efficiency and the system stability are obviously improved.

This invention relates to an integrated laser packaging structure suitable for automated mass production, comprising a packaging box containing an upper cooler, a lower cooler, a laser chip assembly, an optical propagation assembly, an electrical connection assembly, a heat sink, and an optical fiber tail. The lower end face of the upper cooler has an upper coupling groove, and the upper end face of the lower cooler has a lower coupling groove and a first mounting groove, forming a coupling cavity. The heat sink is located within the first mounting groove, and the upper end of the heat sink has a second mounting groove, in which the laser chip assembly is mounted. A mounting assembly is fixedly installed within the coupling cavity. The position of each component within the packaging structure is predetermined, eliminating reliance on semi-automated testing and modulation during assembly, making it suitable for assembly line production. Furthermore, the use of a grooved cooler structure instead of the traditional sheet-like structure of a cooler allows the laser chip assembly and optical propagation assembly to be located within the laser-fiber coupling space formed by the grooves, resulting in better temperature control.

An apparatus and method for adaptively calibrating a splicer are described. The method comprises receiving a first image of a portion of a hollow core fiber, the hollow core fiber comprising a splice produced by the splicer, wherein the portion of the hollow core fibre in the first image is proximate to the splice. The first image is analysed to detect a feature associated with the first image, the feature representing a property of the portion of the hollow core fibre. Using the feature, an adjustment to be made to a parameter of the splicer is computed, wherein the adjustment is computed so as to target one or more of a reduced optical propagation loss and a higher strength, of a subsequent splice of hollow core fiber which is produced by the splicer after initiating the adjustment. The method further comprises initiating the adjustment of the parameter of the splicer.

The application belongs to the technical field of spectral detection, and particularly relates to a light-weight LIBS online detection device and method with automatic focusing, wherein the device sequentially comprises a photoelectric switch, a pre-detection system, a controller, a delay timer, a pulse laser, a mirror, a zoom unit, an ellipsoidal mirror, a displacement adjustment platform, a transmission window sheet, a fiber coupling unit, a spectrometer and a signal strength detector according to a control logic and an optical propagation path. The application can easily realize zooming through the synchronous movement of the ellipsoidal mirror and the fiber coupling unit driven by the zoom lens and the displacement adjustment platform, can adapt to objects with different heights and shapes, solves the problem of large movement load in the zooming process, realizes light weight, and can judge the focusing range in advance through the telecentric lens imaging pre-detection system, so that the detection analysis efficiency is improved.

The present invention provides a phase shifter that can be manufactured using a CMOS process, exhibits low optical propagation loss, can maintain refractive index changes without power supply, and allows for the resetting of those refractive index changes. [Solution] The phase shifter 100 of the present invention comprises an optical waveguide 101 composed of a core 105 and a cladding 106 surrounding the core 105, a substrate 102 on which the optical waveguide 101 is mounted, a heating means 103 for heating the core 105, and an ultraviolet irradiation means 104 for irradiating the core 105 with ultraviolet U, wherein the core 105 mainly contains silicon nitride, and the density of silicon dangling bonds of silicon nitride is 10 in terms of spin density 18 cm -3 The above 10 20 cm -3 The following applies:

A structure includes a substrate, a waveguide, a layer, and a heating assembly. The waveguide has a first thermal conductivity and a light propagation axis. The layer has a second thermal conductivity lower than the first thermal conductivity. The heating assembly is operable to heat the waveguide and modify a refractive index of the waveguide. In a cross-section perpendicular to the light propagation axis, a portion of the heating assembly is positioned between the waveguide and the substrate and is separated from the substrate by the layer.

The utility model provides a long-focal-length telephoto lens. The long-focal-length telephoto lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged along an optical axis from an object side to an image surface, the first object side surface of the first lens is a convex surface, and the first image side surface of the first lens is a convex surface; the second object side surface of the second lens is a convex surface, the second image side surface of the second lens is a convex surface, the third object side surface of the third lens is a concave surface, and the third image side surface of the third lens is a concave surface; the fourth object side surface of the fourth lens is a convex surface, and the fourth image side surface of the fourth lens is a convex surface; and the fifth object side surface of the fifth lens is a concave surface, and the fifth image side surface of the fifth lens is a concave surface. The long-focal-length telephoto lens provided by the utility model is simple in structure and reasonable in design, the five lenses are combined, so that light rays are refracted through the plurality of lenses, the light rays are transmitted to the image chip on the image side surface, an image with high imaging quality is realized, the total length of the lens is shortened, and the use feeling of the lens is improved.

This application relates to a multi-plane optical conversion device and its design method, comprising: a phase modulation component, an optical path reflection component, and a beam splitter component. The phase modulation component includes N phase planes, where N≥1. The optical path reflection component is disposed on the optical propagation path of the phase modulation component and located at the end of the optical propagation path of the phase planes. The beam splitter component is disposed at the beginning of the optical propagation path of the phase modulation component. The device is configured to form a folded optical path, such that incident light enters through the beam splitter component, passes through the phase modulation component along a first propagation direction to reach the optical path reflection component, is reflected by the optical path reflection component, passes through the phase modulation component again along a second propagation direction, and is output by the beam splitter component. Each phase plane has the same physical phase profile in both the first and second propagation directions. This invention reduces the actual number of stacked physical phase planes while achieving the same optical field modulation effect.

The application discloses a phase recovery method based on single fractional Fourier transform amplitude observation, and comprises the following steps: S1, a near-field observation model based on fractional Fourier transform is established according to optical propagation theory; S2, corresponding single fractional Fourier transform amplitude observation information is obtained by simulation according to the established near-field observation model; S3, a phase recovery algorithm based on generalized alternating projection method is established, the single fractional Fourier transform amplitude observation information and signal prior information are taken as inputs, iterative calculation is carried out by using the phase recovery algorithm, and signal reconstruction is realized. The application has the advantages that the requirement of excessive dependence on oversampling or multiple observations is broken, the near-field propagation problem is described by combining a signal processing tool fractional Fourier transform, more accurate and efficient signal reconstruction is realized only from single amplitude observation, and the reconstruction quality is high.

A puncture path planning method and planning system. The puncture path planning method comprises: constructing a three-dimensional model from a medical image; defining organs and tissue as units having not completely identical light absorption degrees, and assigning light absorption coefficients to the units on the basis of whether a biopsy needle is allowed to pass through and the risk level of puncture; and setting a light source in a puncture target region, obtaining grayscale information on the skin surface by means of analysis of light absorption degrees along different paths, and using the grayscale information to feed back a recommendation degree for each puncture starting point. By converting the selection of a puncture path into the problem of finding an optimal puncture starting point, in combination with a light propagation principle, the novel puncture path planning method and planning system can intuitively display location information of a preferred puncture starting point and are more comprehensive and reliable.

This invention relates to a PMD optical propagation time sensor (22) for an optical distance measurement system, comprising an array of PMD optical propagation time pixels (21) having diode nodes (G) for channels A and B (A, B). a G b The PMD optical propagation time sensor includes: a plurality of shift registers constructed and connected to the pixel such that the two switches (S1, S2) can be switched alternately based on the respective registers (FF) in the register entries, wherein a plurality of columns or rows are at least partially assigned to the shift registers; and a switch matrix (80) designed such that the column lines (cola, colb) can be connected to one of a plurality of amplifiers (100), and the plurality of column lines (cola, colb) can be connected to a common amplifier (100). The optical propagation time sensor (22) is designed such that during the integration time period, the charge generated at the optical propagation time pixel accumulates at the diode nodes (diode a, diode b) and the connected column lines (cola, colb).

Gas detecting devices and in particular volatile substance sensors such as breath alcohol devices sensors. The semiconductor gas sensor device includes a laser structure and an optical waveguide resonator formed in a same compound semiconductor which includes at least one optical emission layer and one optical propagation layer. The optical waveguide resonator is formed in the optical propagation layer and is to its greater part separated from the remaining portion of the optical propagation layer. The laser structure is provided adjacent to a portion of the optical waveguide resonator and arranged to transmit electromagnetic radiation at a specific wavelength band to the optical waveguide resonator arranged to resonate at that specific wavelength band.

The utility model discloses an optical waveguide and a near-to-eye display module, and the optical waveguide comprises a plurality of grating units which are arranged in the light propagation direction and are distributed periodically, a grating wire groove is formed between every two adjacent grating units, and each grating unit at least comprises a first grating part and a second grating part which are sequentially arranged in the light propagation direction. The refractive index of the first grating part is not larger than that of the second grating part.

The invention relates to a photonic device (1) comprising a waveguide (10) in which light is dedicated to propagate along a main optical propagation direction (A), said waveguide comprising a central portion (10c) extending along the propagation direction. The device further comprises a phase change material (PCM) patch (20) disposed on the waveguide, wherein the PCM patch is dedicated to be heated. The device further comprises at least one heat sink (100) configured to drain heat from the PCM patch when heated, said heat sink being distinct from the central portion of the waveguide and having a thermal conductivity greater than or equal to that of the waveguide. Another aspect of the invention relates to a photonic system comprising said photonic device.

It is provided a photonic multi-level device 1 comprising: a. a waveguide 11 into which light is dedicated to travel along a main optical propagation direction 10, b. a phase change material patch 12, hereafter PCM patch, on the waveguide 11, c. an electro-thermal switching 13, e.g., a heater, in the vicinity of said PCM patch 12, wherein at least one among the waveguide 11, the PCM patch 12 and the electro-thermal switching 13 has a cross-section that varies along the main optical propagation direction 10. Thus, the present invention deals with novel designs for photonic multi-level devices that permit to modify in a compact, multi-level, reliable, and controllable way the device optical response.

The invention relates to a light guide rod structure optimization design method and device and a medium, and the method comprises the following steps: constructing a TracePro simulation model, and simulating the spatial distribution and multipath optical propagation process of a partial discharge point light source based on the actual GIS device structure and material parameters; defining structural parameters of the light guide rod, performing parameterized structural modeling on the light guide rod, and constructing a multi-parameter joint optimization space; and based on a QAOA quantum optimization algorithm, taking the luminous flux, determined based on the TracePro simulation model, of the emergent end of the light guide rod as a target function, and performing optimal search of the structure parameter combination of the light guide rod. Compared with the prior art, the optical detection structure of the light guide rod can be efficiently and reliably optimized, and the capturing capability of the light guide rod on partial discharge optical signals in the GIS is remarkably improved.

To provide a processing state monitoring device that can improve the accuracy of detecting light from the processing surface during laser processing. [Solution] The processing state monitoring device according to the present disclosure is a device for monitoring the processing state in laser processing, which is performed by irradiating the processing surface of a workpiece with laser light, and comprises at least one photodetector that detects first light that is propagated from a molten region formed around the irradiation spot of the laser light on the processing surface and includes light of a different wavelength from the wavelength of the laser light, and an optical propagation correction element disposed between the processing surface and the at least one photodetector, wherein the optical propagation correction element receives the first light from the molten region and corrects the propagation direction of the first light according to the position of the molten region on the processing surface and emits it to the at least one photodetector.

The application discloses an optical waveguide and a near-eye display module. The optical waveguide comprises a plurality of periodically distributed grating units arranged along an optical propagation direction, and a grating line groove is arranged between two adjacent grating units. Each grating unit comprises at least a first grating part and a second grating part arranged along the optical propagation direction in sequence. The refractive index of the first grating part is not greater than the refractive index of the second grating part.

The embodiment of the application provides a kind of optical correlation calculation method and system based on light field inner product, belong to optical computing field.The method comprises: obtaining query vector and key vector;The query vector is optically encoded to generate query light field, and the key vector is optically complex conjugate encoding to generate key light field;The query light field and the key light field are loaded in different spatial regions of modulation plane according to preset spatial arrangement mode, and are introduced into corresponding spatial carrier frequency modulation respectively;Make multiplexed light field after loading propagate through optical propagation structure, and form light intensity distribution containing conjugate cross term on detection plane;Based on the light intensity distribution, the conjugate cross term is separated and extracted to obtain correlation response.The technical scheme of the embodiment of the application can reduce the electronic computing burden in correlation evaluation process, reduce system processing overhead, and improve the implementation capability of optical domain correlation information processing.

The invention belongs to the technical field of lasers. The invention provides an optical-mechanical thermal coupling analysis method for a laser under vibration and temperature disturbance conditions. The method comprises the following steps: establishing a laser three-dimensional structure model according to laser design parameters; establishing a laser optical performance calculation model based on the laser design parameters; establishing a finite element model for dynamic and thermodynamic analysis based on the laser three-dimensional structure model; applying vibration and temperature change boundary conditions to the finite element model and solving to obtain coordinate displacement data of the mirror surface and related optical elements; performing rigid body displacement and surface deformation separation and processing on the coordinate displacement data, and converting the processed data into a phase modulation matrix acceptable to a laser optical performance calculation model; importing the phase modulation matrix into a laser optical performance calculation model, and performing optical propagation and cavity mode performance simulation evaluation; according to the invention, full-link prediction from structural deformation to optical performance degradation of the laser is realized.

The invention discloses a reactor internal discharge fault simulation method and device based on optical propagation characteristics and electronic equipment. The method comprises the following steps: constructing a reactor simulation model based on a reflection coefficient of a reactor internal structure, an attenuation coefficient of transformer oil, actual arc discharge power, a standard arc fault position and a standard arc fault level; determining the illumination intensity and the light intensity distribution of the side wall of the reactor oil tank of the current reactor according to the simulation model; and determining an arc fault position and an arc fault level in the current reactor based on the illumination intensity and the illumination distribution. According to the invention, the optical characteristic of discharge in transformer oil and the optical signal propagation characteristic are taken as the basis for realizing the optical measurement method for the internal discharge fault of the reactor, so that the recognition speed and accuracy of the internal discharge fault of the reactor are improved, and the working stability and safety of a power system are improved.

The present application belongs to the field of optical communication, signal processing and micro-nano optical technology, and specifically relates to a multi-task optical diffraction neural network and a design method thereof. On the basis of a traditional diffraction neural network, the present application innovatively uses a phase-change material metasurface unit structure as a reconfigurable diffraction element; the phase modulation parameters are optimized through a deep learning algorithm to obtain the phase distribution of the multi-task optical diffraction neural network, and the corresponding metasurface unit structure is matched and selected from the constructed unit structure library according to the phase distribution to finally construct a phase modulation layer. In the running process, the dynamic reconfiguration of the multi-task function is realized by changing the crystallization state of the phase-change material and combining the switching of the incident light polarization state. In the process of optical propagation, the efficient processing of different image recognition tasks is realized by reconstructing the wavefront of the input image multiple times, and the problem of function solidification of the traditional diffraction neural network model when facing diversified tasks and data features is effectively overcome.

To provide an optical integrated circuit which can suppress degradation in optical propagation characteristics in an optical waveguide.SOLUTION: An optical integrated circuit 1A comprises: a substrate 31; an optical waveguide layer 32, disposed on the substrate 31, which includes an input coupler 37 and an optical waveguide 38; a light-emitting device 4, disposed on the optical waveguide layer 32, which has a first surface 4a on the optical waveguide layer 32 side and a second surface 4b on the opposite side to the optical waveguide layer 32; and a sub-mount 5, disposed on the light-emitting device 4, which has a third surface 5a on the light-emitting device 4 side and a fourth surface 5b on the side opposite to the light-emitting device 4. The light-emitting device 4 includes a light-emitting layer 43 and a phase modulation layer 44. The phase modulation layer 44 includes a base layer 44a and a plurality of regions 44b differing in refractive index.SELECTED DRAWING: Figure 2

The invention belongs to the field of optical propagation, and particularly relates to a dynamic defocus adjusting system which comprises a first geometric phase liquid crystal device, a pixelated liquid crystal optical switch and a second geometric phase liquid crystal device, and the pixelated liquid crystal optical switch comprises a plurality of pixel-level liquid crystal optical switches. The pixelated liquid crystal optical switch comprises a first area and a second area corresponding to the first angle; when the pixel-level liquid crystal optical switch is powered on, the output light can fall on the retina of a viewer, when the pixel-level liquid crystal optical switch is not powered on, the output light falls in front of the retina of the viewer, and when eyeballs are located at a first angle, the pixel-level liquid crystal switch in the first area is controlled to be switched on; light entering the central area of the retina of the eyes of the viewer converges on the retina, the pixel-level liquid crystal switch in the second area is controlled to be switched off, light entering the surrounding area of the retina of the viewer converges in front of the retina, and then defocus stimulation is formed.

To provide an optical waveguide with which it is possible to gain an optical path length per unit area, and in which optical transmission losses are suppressed.SOLUTION: Provided is an optical waveguide comprising: a light introduction unit; a light derivation unit; an elliptical light circulation unit; a first waveguide connected to the light introduction unit at a beginning end in a light propagation direction and connected to the light circulation unit at a terminating end; a second waveguide connected to the light circulation unit at the beginning end in the light propagation direction at a position different from the position at which the light circulation unit and the first waveguide connect to each other, and connected to the light derivation unit at the terminating end; a clad layer for supporting the light circulation unit; and a substrate for supporting the clad layer. The center of gravity of the light circulation unit located at a position shifted from the extending direction of the first and second waveguides, and the light introduced from the light introduction unit propagates through the first waveguide, the light circulation unit, and the second waveguide in the order stated.SELECTED DRAWING: Figure 1

The invention relates to a system for distributing or recombining laser beams (SDL), comprising a reflective optical system (SOR2) which is mounted so as to rotate about an axis referred to as the main axis (APR) and parallel to an optical propagation axis (APE), referred to as the input axis, of a laser beam (FL), the reflective optical system comprising a cube corner-shaped structure having three mirrors (F1, F2, F3) which correspond to respective faces and are arranged to return the laser beam along an optical propagation axis (APS) referred to as the output axis and parallel to, but not coincident with, the input optical propagation axis (APE) and the main axis (APR); the reflective optical system being configured so that its rotation about the main axis (APR) leads to a parallel translation of the output optical propagation axis (APS) along a circular trajectory (T).

The application discloses a low-loss wavelength division multiplexer coupling optimization method, and belongs to the optical coupling technical field of the wavelength division multiplexer. First, rib taper is utilized to match with a large-core optical fiber, and mode size is moderately reduced, so that the mode conversion problem in the large-core optical fiber is solved; in the optimization process, the input size of two-stage taper is determined by using modal overlap analysis, and the optimal height of the double taper and the high-performance length range are determined by using EME optical propagation embedded scanning. Secondly, the reduced mode is coupled into a submicron silicon waveguide by using an inverted taper, and the inverted taper multi-stage series structure is matched, so that high conversion efficiency of the coupler is ensured, and the required space is minimized. In the application, the rib taper structure is adopted, high coupling efficiency and compact size design are combined, high tolerance between the optical fiber and the chip is achieved, and the application is suitable for photonic integrated circuits of different platforms; the multi-stage taper series structure adopted in the application performs well under TM polarized light.

An optical modulator that uses adiabatic tapers to change the width of the waveguides between multimode waveguides and single mode waveguides on a low-loss, e.g. thin-film lithium niobate, electro-optic platform. The architecture enables the utilization of the fundamental mode of multimode wide optical waveguides that have lower optical propagation loss without sacrificing the benefit of the signal integrity and ease of control of single mode operation.

The invention discloses a multi-task integrated optical visual processing system and a preparation method thereof. A diffractive optical metasurface is used for carrying out random phase modulation on an input light field, and an optical propagation assembly is used for carrying out linear propagation transformation on the modulated light field; the image sensor is used for carrying out light intensity detection on the processed output light field, obtaining light intensity distribution characteristics and converting the light intensity distribution characteristics into electric signals to be output; and the electronic processing module is used for decoding the electric signal to complete a classification or regression type visual task. According to the scheme, a general optical computing architecture based on random phase projection is provided, high-density and high-parallel optical random projection and a low-parameter electronic decoder are integrated, an optical part does not need to be trained, high-precision and high-energy-efficiency processing is achieved in various machine vision tasks, and the high-precision and high-energy-efficiency processing is achieved. And an innovative path is provided for breaking through the bottleneck of traditional electronic calculation in speed and power consumption and realizing the practicability of a large-scale optical intelligent processing system.