107 results about "Light propagation" patented technology

This invention belongs to the field of wavelength division multiplexing optical communication technology, specifically relating to a reverse coupler based on a thin-film lithium niobate platform. The reverse coupler includes: a lithium niobate-on-insulator substrate, a first waveguide, a second waveguide, and a coupling region. The first and second waveguides are disposed in the device layer of the lithium niobate-on-insulator substrate. The first and second waveguides are arranged in parallel along the light propagation direction within the coupling region. A periodic grating perturbation structure is disposed on the first and / or second waveguides. This reverse coupler utilizes the grating perturbation structure to ensure that the modes of the two waveguides satisfy the phase matching condition. The optical signal input to one waveguide is reverse-coupled to the falling port of the other waveguide. Utilizing the large photoelectric coefficient of lithium niobate material, this reverse coupler can tune its spectrum under specific conditions by applying a voltage.

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 provides an image generation unit and a head-up display system, relates to the technical field of display, and comprises a light source, a first polarization element, a liquid crystal display screen and a second polarization element; the light source is configured to emit an initial light beam; the first polarization element is located on a propagation path of the initial light beam and is configured to generate a first polarized light beam; the liquid crystal display screen is arranged at intervals with the first polarization element in a light propagation direction and is located on a propagation path of the first polarized light beam; a first air gap is formed between the liquid crystal display screen and the first polarization element; and a second air gap is formed between the liquid crystal display screen and the second polarization element; in the technical scheme, external light that flows in reversely and heat absorbed by the light source are all concentrated on the polarization plate, and the liquid crystal display screen is not bonded, so that the risk of screen burn-in of the display screen can be reduced.

The invention relates to a glass-based photoelectric volume pulse wave cover plate material as well as a preparation method and application thereof. The cover plate material comprises: a glass substrate; the annular structural part is embedded in the glass substrate; the annular structural member and the glass substrate are made of the same material; the glass substrate comprises the following components in percentage by mass: 0.1 wt%-0.2 wt% of BaO; 0.1 wt% to 0.6 wt% of PbO; 0.1 wt% to 0.7 wt% of Sb2O3; 25 wt%-61 wt% of SiO2; 16 wt% to 18 wt% of B2O3; 10 wt% to 15 wt% of Al2O3; 8 wt% to 12 wt% of R2O; wherein R2O is composed of Li2O, Na2O and K2O, and the content of K2O is smaller than that of Na2O. The technical problem to be solved is to provide the cover plate material with a large number of sensor optical channels, so that the cover plate material has high transmittance and high crosstalk resistance, a plurality of optical paths can be formed in the cover plate material, and the problems of scattering and the like in the light propagation process are reduced by selecting single glass with a specific formula, so that the light transmission efficiency is improved. The energy loss in the light ray propagation process is reduced, and the propagation distance of the light rays in the glass cover plate is increased; meanwhile, the glass cover plate also has higher mechanical strength.

The application relates to a two-stage refractive index gradient mode spot converter based on a metamaterial and a preparation method thereof, and belongs to the technical field of silicon light, wherein the converter comprises a silicon substrate, a buried oxygen layer located on the silicon substrate, a subwavelength grating waveguide structure and a solid waveguide structure located on the buried oxygen layer, and a gradient refractive index upper cladding layer located on the subwavelength grating waveguide structure and the solid waveguide structure; the subwavelength grating waveguide structure and the upper cladding layer can transversely and longitudinally amplify a mode field, can effectively reduce substrate absorption loss, and can increase alignment tolerance; by designing a subwavelength grating duty cycle and an upper cladding layer two-material duty cycle, the refractive index is gradually changed along the light propagation direction, the distribution of light field energy is better controlled, the light field is gradually expanded and adapted in space, the mode mismatch problem can be effectively avoided, and the design freedom is enhanced.

An optical module, a lighting device, and a motor vehicle are provided. The optical module includes a first light source and a first optical element, as well as a second light source and a second optical element, wherein the first and second optical elements collect light emitted by the first and second light sources such that the light emitted by the first and second light sources enters the first and second optical elements respectively and is redirected. A projection optical system is configured to project the redirected light from the first and second optical elements. The first optical element has a total reflection surface disposed on its surface, the total reflection surface reflecting at least some of the light rays within the first optical element according to a cutoff line profile. The second optical element has at least one total reflection surface to change the direction of light emitted from the second light source such that the light exits from the light-emitting surface of the second optical element. The optical focus of the projection optical system is disposed at or near the edge of the total reflection surface along the light propagation direction of the first light source.

A spectrometer apparatus (130) and method for obtaining spectral information about at least one object (110) are disclosed. The spectrometer apparatus (130) includes: - at least one light-emitting element (132) configured to emit illumination light (134) to illuminate at least one object (110) in at least one object illumination plane (136) with at least two object illumination spots (188), specifically with at least two non-intersecting object illumination spots, wherein each object illumination spot (188) has a centroid (190), wherein the centroid (190) of the object illumination spot (188) defines an object illumination line (192); - At least one imaging system (140) includes at least one detector (142) configured to detect detection light (144) from an object (110) and to generate at least one detector signal upon detection of the detection light (144), wherein the imaging system (140) further includes at least one optical element (148) for guiding the detection light (144) onto the detector (142), wherein the imaging system (140) is configured to receive the detection light (144) from at least one imaging plane, wherein the imaging system (140) is configured to receive the detection light (144) in the imaging plane from at least one elliptical light collection profile (196), wherein the major axis (194) of the elliptical light collection profile (196) is not parallel to the object illumination line (192); and - At least one sample interface (160) is configured to allow illumination light (134) to illuminate the object (110) and to allow detection light (144) from the object (110) to propagate to the imaging system (140), wherein the sample interface (160) is configured to define the measurement posture of the spectrometer device (130) relative to the object (110).

According to an embodiment of the present disclosure, an image generation device providing a motion artifact correction function is disclosed. The device comprises a light generation unit configured to emit light irradiated onto a target object, a light receiving unit configured to receive optical signals reflected from the target object, a driving unit configured to control a light propagation path, and at least one processor. The processor is configured to irradiate light onto the target object to generate at least one scanning image, estimate a motion speed, generate a corrected scanning image by correcting the at least one scanning image based on the estimated motion speed, and generate a final corrected image based on the at least one corrected scanning image.Also disclosed is a method for operating the image generation device.

The application belongs to the technical field of optical detection, and particularly relates to an optical lens detection device, which comprises a base, an emitter, a supporting seat and a receiver are installed on the base, a lens is placed on the supporting seat, a first air bag is arranged between the emitter and the lens and between the lens and the receiver respectively, and is used for filling an optical path space and discharging air; the first air bag is communicated with a second air bag through a pipeline to form a closed air path, the second air bag is provided with a gas transfer mechanism, the gas transfer mechanism comprises a pressing piece and a first elastic piece, and the second air bag is a concertina type air bag body; when the pressing piece is driven by external force, the application avoids the airflow violent disturbance caused by the traditional blowing cleaning mode, effectively cleans the suspended dust on the detection optical path, guarantees the stability of the detection light propagation environment, improves the accuracy of the detection signal, and meets the demand for high-precision detection in the lens processing process.

This invention discloses a geological disaster early warning method based on remote sensing technology, belonging to the field of geological disaster early warning technology. The method includes: acquiring remote sensing image data with at least two different imaging principles within the same geographic unit and the same observation time window; performing geometric correction on the remote sensing image data under a unified coordinate system; and converting the remote sensing image data into corresponding physical quantity data and completing scale consistency processing through sensor response conversion and radiometric calibration; using the remote sensing image data and digital elevation data under the unified coordinate system, calculating the slope and aspect of each pixel, and constructing the light propagation path based on the solar altitude angle and solar azimuth angle. This invention models the influence range of environmental factors from the perspective of propagation structure by constructing light propagation paths and heat diffusion propagation paths under a unified coordinate system and calculating the direction vector field formed by the gravity direction of the slope. This allows anomaly identification to be based not only on numerical changes but also on the analysis of propagation mechanisms.

The application discloses a kind of hydraulic bulging test piece forming quality control method, comprising the following steps: setting the bulging information and initial bulging information of standard test piece;Utilize the bulging information of standard test piece and the initial bulging information, based on mold, obtain the bulging test piece of standard morphology, the mold is the composite mold of toughened glass and diamond;Based on the mold, the bulging test piece of standard morphology is detected, and based on the bulging information of standard test piece, the control of hydraulic bulging test piece forming quality is realized.The application determines the bulging distance by calculating the light propagation time in air, the toughened glass propagation time and the diamond propagation time, and obtains the bulging height and axial feed amount in this way, which can observe the bulging height of the test piece in real time, master the bulging condition, so as to realize quality control.

This invention provides an end-face coupler and a silicon photonics chip. The end-face coupler includes a substrate layer, a first coupling unit, and a second coupling unit. The first coupling unit is disposed above the substrate layer, and the second coupling unit is disposed above the first coupling unit. The substrate layer is composed of silicon. The first coupling unit includes a silicon dioxide cladding layer. Multiple silicon nitride waveguide groups are arranged at intervals along a first direction in the silicon dioxide cladding layer. Each silicon nitride waveguide group has multiple silicon nitride waveguides arranged at intervals along a second direction, wherein the second direction is the input light propagation direction and is perpendicular to the first direction. The second coupling unit is composed of silicon nitride. The silicon photonics chip uses the above-described end-face coupler. This invention can receive input light spots of various shapes and has multiple controllable parameters, providing a high degree of freedom in mode spot control.

The utility model discloses a kind of parallel light transceiver modules, comprising: shell;Optical fiber array unit, comprising: optical fiber ribbon unit, comprising multiple optical fiber ribbons;Micro-lens array unit, comprising: lens body, reflection portion is provided thereon;First lens assembly, second lens assembly and third lens assembly;Filter, assembled on lens body, chip unit, comprising: first processing chip, with second lens assembly optical coupling positioning by multiple first channels;And second processing chip, with third lens assembly optical coupling positioning by multiple second channels;First light propagation path is formed between optical fiber ribbon, filter, reflection portion, third lens assembly, first processing chip;Second light propagation path is formed between optical fiber ribbon, filter, second lens assembly, second processing chip;Wherein, first light propagation path and second light propagation path coincide in the path segment of side close to optical fiber ribbon. Small size packaging can be realized by the parallel light module of the present application.

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 provides a telecentric lens and a mechanical vision detection device. The telecentric lens comprises a first lens module, the optical power of the first lens module is positive; a second lens module, the second lens module comprises a light source, a beam splitter and a first lens group and a second lens group for reducing chromatic aberration of the telecentric lens, the light source is arranged on the beam splitter, the beam splitter is used for reflecting light emitted by the light source to illuminate a measured object and transmitting light emitted by the first lens group to the second lens group; the optical power of the second lens module is negative; a third lens module, the optical power of the third lens module is positive; the first lens module, the first lens group, the beam splitter, the second lens group and the third lens module are sequentially arranged along the light propagation direction. The telecentric lens and the mechanical vision detection device provided by the application reduce the interference of stray light on imaging and improve the imaging quality.

This invention provides a fiber transition material for fiber-to-waveguide coupling in optoelectronic interconnection and its preparation method, relating to the fields of optical communication and optoelectronic interconnection technology. The fiber transition material includes a refractive index gradient segment along the light propagation direction. Within this gradient segment, the local content of phenyl acrylate monomers and surface-modified titanium dioxide and zirconium dioxide nanoparticles continuously varies along the light propagation direction. By constructing a continuously varying refractive index gradient segment along the light propagation direction between the fiber end face and the waveguide coupling end, and by controlling the local content of phenyl acrylate monomers and surface-modified titanium dioxide and zirconium dioxide nanoparticles, the refractive index continuously transitions from 1.448-1.462 to 1.498-1.532. This continuous gradient structure eliminates step interface reflection and scattering, reduces coupling insertion loss, and improves the coupling efficiency and stability of the optoelectronic interconnection structure.

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 proposes a high-power, high-coupling-efficiency semiconductor optical amplifier waveguide structure, comprising a first waveguide (8), a second waveguide (9), and a third waveguide (10) arranged sequentially. The first waveguide is a straight waveguide region located at the light input end of the waveguide structure; the third waveguide is a straight waveguide region located at the light output end of the waveguide structure; and the second waveguide is an adiabatic waveguide region with a ridge width that varies as a high-order continuous function. In the direction of light propagation, the width of the adiabatic waveguide region gradually increases from narrow to wide, and the curvature at the beginning / end of the adiabatic waveguide region is the same as the curvature of the straight waveguide regions before and after the adiabatic waveguide region, respectively. The ridge width of the adiabatic waveguide region gradually changes, and the waveguide width at the beginning / end of the adiabatic waveguide region is the same as the width of the straight waveguide regions before and after the adiabatic waveguide region. This invention can significantly improve the power amplification and coupling efficiency of the SOA.

This invention discloses a heterogeneous integrated electro-optic modulator and its alignment method based on write field splicing compensation, relating to the field of silicon-based optoelectronics technology. The modulator comprises, from bottom to top, a silicon substrate with a thermal oxide layer, a bottom patterned waveguide layer, an intermediate transition dielectric layer, a top electro-optic thin film layer, and a top traveling-wave electrode structure. The bottom waveguide layer has a write field splicing region along the light propagation direction, within which a thermal compensation structure is configured, and a dedicated alignment mark is provided within a designated area. This mark is formed synchronously with the waveguide layer and the compensation structure within the same photolithographic write field. The top traveling-wave electrode structure is overlaid across layers based on this mark, forming a predetermined spatial matching relationship with the write field splicing region. This invention can solve the problems of optical scattering loss caused by long-distance bottom waveguide field-separated exposure splicing and the limited accuracy of cross-layer overlay after heterogeneous bonding, and achieves precise overlay positioning of the cross-layer traveling-wave electrode.

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).

A light management system includes a visible light source and a planar layered light confining structure having front and back sheets with a light converting layer between them. A microstructured front layer on the front sheet includes linear optical structures extending between opposite edges. The back sheet has an opaque reflective surface, and the structure includes a surface for total internal reflection. Light input ports having a cumulative area of no more than 10% of the converting layer area are arranged in a two-dimensional array and used to inject light into the structure. The light converting layer has an active layer containing light converting materials with different bandgaps that absorb light in a selected spectral band and transmit light in a different spectral band. The active layer includes quantum dots and has a thickness less than needed for complete single-pass absorption to accommodate multiple transverse light propagation.

The application discloses a kind of projection module based on microlens array, including field lens array, projection source, projection lens array, prism array, interval area is formed between prism array and projection lens array, prism array surface is divided into interval part and mirror surface part, interval part and mirror surface part are arranged at intervals and are communicated with each other through interval area, interval part is parallel with the surface of base one, mirror surface part forms a certain angle with the surface of base one;Prism array is divided into M layers along the direction of light propagation, M layer prism array uses different materials, and the contact interface of every two adjacent prism array forms alternately arranged interface area one, interface area two, interface area one corresponds interval part, and interface area two corresponds mirror surface part;Projection lens array is divided into N layers along the direction of light propagation, N layer projection lens array uses different materials, and in the two side face types of every layer projection lens array, at least one side face type is optical face type except plane.

This invention relates to the field of optical lenses and discloses a camera optical lens, comprising a lens group, a prism, and an image plane. The lens group comprises five lenses, which are arranged sequentially from the object side to the image side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power. The prism is disposed between the fourth and fifth lenses in the light propagation path. The fifth lens and the image plane can move towards or away from the prism, allowing the camera optical lens to switch between a first focusing state and a second focusing state; and satisfying the following relationships: 1.40≤TTLa / fa≤1.56; -1.10≤f3 / f4≤-0.80; 4.00≤(R14+R15) / (R14-R15)≤25.00.

The application discloses an atmospheric turbulence influence evaluation method and system applied to laser communication, the convergence and sustainability of the motion state among multiple communication test spots are analyzed, the overall motion state of the test spot is evaluated, and finally, the influence of atmospheric turbulence on the light propagation path is evaluated according to the overall motion state of the spot, and then the influence size on the space laser communication is evaluated. The application quantifies the influence of atmospheric turbulence on the light propagation path in the space laser communication, more accurately represents the motion state of the atmospheric turbulence, and has important significance for improving the performance of the space laser communication.

The application discloses a lithium niobate on-chip reconfigurable diffraction computing system and method based on digital driving, and belongs to the technical field of optical computing. The system comprises a digital logic control module, a high-voltage digital interface module, a lithium niobate on-chip diffraction computing module and an optical input / output coupling module. The digital logic control module converts the binary logic level signal input from outside into a thermometer code control signal, which is directly converted into a binary switch driving signal through the high-voltage digital interface module, without the need for digital-to-analog conversion. The lithium niobate on-chip diffraction computing module comprises a diffraction pixel unit composed of a lithium niobate and a silicon dioxide composite waveguide. Each pixel unit is provided with equal-length sub-electrode segments segmented along the light propagation direction above the pixel unit. Discrete phase accumulation is realized through binary driving. The number of activated sub-electrode segments is proportional to the phase delay, full phase coverage in the range of 0-2pi is realized, and the modulated light wave completes diffraction computing through interference superposition.

The invention relates to an optical system (1) for 3D imaging having at least the following components: an input aperture (2) having an optical axis (OA), a first metalens array (3) and a second metalens array (4), a detector (5), wherein the input aperture (2) is configured to collimate object light (10) coming from an object under investigation (S) in a first spectral range and to fix it in a predefined polarization state, wherein the object light (10) propagates to the first metalens array (3) at a first inclination angle (β) in relation to the optical axis (OA) of the input aperture (2), wherein the first metalens array (3) is configured and arranged to focus a first portion (101) of the object light (10) and to leave a second portion (102) of the object light (10) unchanged, wherein the second metalens array (4) is configured and arranged to collimate the focused first portion (101) and to transmit the second portion (102) unchanged, so that the first portion (101) and the second portion (102) enclose a second inclination angle (β′) with each other in relation to their respective propagation directions and hit the detector (5) forming an interference pattern, wherein the second inclination angle (β′) corresponds to twice the first inclination angle (β) in terms of magnitude.