65 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:

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.

An embodiment photonic coupler may include a first input waveguide, a second input waveguide, a first output waveguide, a second output waveguide, a coupling region in which electromagnetic fields associated with two or more of the first input waveguide, the second input waveguide, the first output waveguide, and the second output waveguide are overlapping with one another, and an electro-optic device in the coupling region that includes an index of refraction that is a first function of an applied voltage. The coupling region may have an effective coupling length, along an optical propagation direction, which is a second function of a product of a physical length of the coupling region multiplied by the index of refraction of the electro-optic device. A mixing ratio of electromagnetic energy transferred between the input and output waveguides, due to evanescent coupling, may be controlled by adjusting the voltage applied to the photonic coupler.

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.

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.

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.

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.

An optical communication method comprises modulating an optical carrier (OC) by both first and second electrical signals to provide an optical dual signal (S) comprising quantum (Sq) and classical (Sc) signals, first (Dq) and second (Dc) data being encoded in the first and second signals respectively; transmitting and receiving said dual optical signal (S) to and from an optical propagation medium; extracting the first and second signals from the received dual signal; compensating in the extracted first signal and from the extracted second signal: a frequency mismatch (Δf) between a central frequency of the optical quantum signal and a local oscillator optical wave (LO); a phase mismatch (Δφ) between the optical carrier and the local oscillator wave; and decoding the first and second data from the compensated first signal and the extracted second signal respectively.

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.

An apparatus includes a silicon (Si) optical phase shifter. In an embodiment, the optical phase shifter comprises a planar optical waveguide having a silicon optical core, and a pair of biasing electrodes located along opposite sides of a segment of the silicon optical core. The segment of the silicon optical core comprises a series of p-n junctions. The series extends in a direction transverse to an optical propagation direction in a segment of the planar optical waveguide including the segment of the silicon optical core. At least two of the p-n junctions are configured to be reverse biased by applying a voltage across the biasing electrodes.

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 invention is applicable to the technical field of semiconductor lasers, and provides a cascade coupling super-symmetric semiconductor laser, which comprises a main waveguide region, an N-type waveguide region, an active region and a P-type waveguide region, the cascade super-pairing array comprises super-pairing waveguides and super-pairing waveguide spacer regions, the cascade super-pairing array is formed by multiple cascade coupling transformation, the coupling transformation forms main waveguide region lasing mode, competition mode coupling and coupling waveguide, the coupling waveguide has an optical propagation constant similar to that of the competition mode, and the coupling waveguide has an optical propagation constant similar to that of the competition mode. The coupling module is used for realizing coupling loss of a competition mode; and the main waveguide region lasing mode and the coupling waveguide are combined to form a main waveguide region for next coupling transformation, so that multiple cascade coupling transformation is carried out and a large mode discrimination capability is obtained. Therefore, multiple times of coupling of a main waveguide competition mode can be realized through multiple times of cascade coupling conversion, and the single transverse mode characteristic of the semiconductor laser is further improved.

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 discloses a blind single phase recovery method based on a self-supervised physical adaptive network, and relates to the technical field of optical imaging. Establishing a blind phase recovery method based on self-supervision in a coherent diffraction system of an optical propagation theory, and jointly optimizing physical parameters and a target image; according to a physical propagation model based on an angular spectrum method, the optimized target image is converted into network parameter optimization, and a corresponding single reconstruction image and a corresponding diffraction distance are obtained through simulation; establishing a physical adaptive network, taking an acquired real diffraction pattern as input, converting phase information into physical parameters, and realizing reconstruction of a blind image and accurate estimation of the physical parameters; a fine physical consistent loss function and a self-supervised training model are established, optimization of physical parameters and network parameters is jointly constrained through two parts of detail loss and structure loss, and a micro-penalty mechanism is introduced to guide training. According to the method, the problem of blind single-frame phase recovery is solved, and excellent stability and robustness are ensured.

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 present invention provides an optical functional device in which both an input optical fiber and an output optical fiber are arranged on one surface of a housing, thereby maintaining low crosstalk between input and output light and achieving excellent optical characteristics. The optical functional device comprises a housing that houses an optical functional element, an input optical fiber, and an output optical fiber, wherein both the input optical fiber and the output optical fiber are fixed to one surface of the housing. The optical functional device comprises a first reflection surface that reflects input light emitted from the input optical fiber toward the direction of an output light path; a second reflection surface that reflects the input light reflected by the first reflection surface toward the optical functional element; and a third reflection surface that reflects output light from the optical functional element away from the optical axis of the input optical fiber. The optical axis of leakage light that is reflected by the first reflection surface and then passes through the second reflection surface, or an extension line obtained by extending the optical axis within an optical propagation medium through which the leakage light can propagate, does not include a portion that coincides with the optical axis of the output light reflected by the third reflection surface.