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925 results about "Light propagation" patented technology

Propagation Of Light. Propagation of light refers to the manner in which an electromagnetic wave transfer it’s energy from one point to another. Three main processes generally occur when light passes between boundaries from one medium to another: Transmission. Reflection.

Underwater image enhancement method based on Mama multi-feature enhancement fusion

The invention provides an underwater image enhancement method combining high-frequency enhancement, space-frequency mixed feature extraction and a Mama enhancement fusion technology. The method aims at solving the problems of low contrast ratio, color distortion, detail loss and the like caused by absorption and scattering effects in the light propagation process of the underwater image, the image quality is improved, and the visual perception effect is improved. The method specifically comprises the following four main steps: firstly, acquiring and preprocessing initial data sets of different underwater scenes; secondly, extracting texture detail information of the image through a texture enhancement module; thirdly, further enhancing texture details by using a space-frequency mixed feature extraction module; and finally, in combination with the original image, the texture information and the spatial frequency domain enhancement result, realizing feature fusion of the image through a Mama enhancement fusion module, thereby effectively recovering details of the underwater image, correcting color deviation and improving the definition and visual effect of the image. According to the method, the enhancement performance of the underwater image in a complex environment can be improved, and powerful support is provided for applications such as underwater detection, target detection, object recognition and image segmentation.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Needle Guidance Using Fiber Optic Shape Sensing

A system, apparatus and method directed to placing a medical instrument in a patient body, where the system includes the medical instrument having a first optical fiber, a console and an interconnect having a second optical fiber to receive incident light from the console and propagate the incident light to the medical instrument. The interconnect includes a predetermined bend along its length, such that logic of the console may determine a positioning and an orientation of the medical instrument relative to the predetermined bend. Additionally, the logic may generate a display of the medical instrument based on the reflected light signals and the determination of the positioning and the orientation of the medical instrument relative to the predetermined bend, where the display may be rendered as an overlay on an ultrasound image.
Owner:BARD ACCESS SYSTEMS INC

Building information model scene rendering method and system based on parallel computing

The invention relates to the technical field of scene rendering, in particular to a building information model scene rendering method and system based on parallel computing, and the method comprises the following steps: based on scene data stored in a building information model, analyzing space coordinates of geometric structure nodes of a building, and associating the geometric structure nodes with material attributes; and analyzing a data partition relationship according to the illumination distribution, and generating a geometric material illumination analysis result. According to the method, deep integration of geometry, materials and illumination is realized by analyzing spatial coordinates of geometric nodes and material attributes and combining illumination partition analysis, the data organization efficiency of a complex scene and the analysis precision of an illumination path are improved, light energy in a noise area is optimized by analyzing light propagation and energy distribution in a segmented manner, refraction and reflection paths are corrected, and the accuracy of the light path analysis is improved. And through texture boundary and scene geometry conjoint analysis, texture fracture is repaired, detail expression is enhanced, efficient analysis and optimization of complex building scene data are realized, and the high-precision rendering requirement is met.
Owner:SUZHOU WHITE TECH CO LTD

Modeled camera layout method and system

The invention relates to the technical field of camera layout, in particular to a modeling camera layout method and system. The method comprises the following steps: acquiring three-dimensional geometric scanning data and dynamic object data of a monitoring space; performing light field space modeling on the monitoring space according to the three-dimensional geometric scanning data to obtain space light field distribution data; performing light tracing analysis on the spatial light field distribution data according to the dynamic object data to obtain light propagation characteristic data; performing effective coverage analysis based on a light intensity threshold value and a field angle range on the monitoring area by using the light propagation characteristic data so as to obtain area coverage characteristic data; and performing adaptive optimization calculation on the initial layout of the camera through the area coverage feature data and pre-acquired environment parameter data to obtain camera layout parameter data. By introducing the four-dimensional light field function, the propagation characteristics of the light in the space can be comprehensively described, so that the coverage analysis is more accurate.
Owner:SHENZHEN HUAYUTE TECH CO LTD

Lamp arrangement method and system based on virtual modeling and medium

The invention relates to the technical field of virtual modeling, in particular to a lamp arrangement method and system based on virtual modeling and a medium. The method comprises the following steps: obtaining dynamic monitoring data of a target space, wherein the dynamic monitoring data comprises real-time illumination intensity data, people flow density data and ambient light change data; performing prediction modeling on the illumination demand of the target space according to the dynamic monitoring data to obtain illumination demand prediction data including expected illumination requirements and light distribution characteristics in different time periods; the adaptive light propagation grid is constructed in the digital twinborn space based on the illumination demand prediction data, grid division data are obtained, and the adaptive light propagation grid has high grid density in a region with severe illumination change and low grid density in a region with smooth illumination change. According to the method, comprehensive illumination analysis and evaluation can be carried out in the initial stage of design, and blindness and low efficiency in a traditional design method are avoided.
Owner:SHENZHEN GAODUNDI TECH CO LTD

Virtual imaging method and system applied to virtual shooting, computing equipment and storage medium

The invention provides a virtual imaging method and system applied to virtual shooting, computing equipment and a storage medium, and relates to the technical field of virtual imaging. The method comprises the following steps: synchronously acquiring object surface reflection characteristic data by using a multi-wavelength light source, and generating various imaging parameters through an image feature extraction network; the dynamic attitude data and binocular vision depth information are fused, and virtual and real scene dynamic space coordinate mapping is constructed; calculating the surface reflection intensity distribution of the virtual object in real time through a light propagation simulation module in combination with the specular reflectance and deformation correction parameters, and dynamically adjusting the relative position of the virtual object and the real light source; generating a continuous and smooth shadow boundary transition effect based on a material attenuation model; and performing space-time calibration on the shadow effect by using the dynamic attitude sequence to realize frame-level synchronous rendering of virtual and real light source positions and shadow changes. According to the technical scheme provided by the invention, through optical parameter modeling and dynamic path optimization, the problem of light and shadow distortion of the virtual object in a real scene is solved.
Owner:SHANGHAI SOKALIS MULTIMEDIA TECH CO LTD

Image recognition and correction system based on optical model and environmental perception

The invention discloses an image recognition and correction system based on an optical model and environment perception, and relates to the technical field of image processing, and the system comprises an environment perception module which is used for collecting multi-medium refractive indexes, interface three-dimensional forms and initial image data through a refractive index sensor, a three-dimensional laser scanner and a visual camera; an environment perception data set is formed through dynamic correction and multi-source fusion; the optical model is constructed on the basis of environment sensing data, the light propagation path is calculated in combination with the interference compensation sub-model, and the interference compensation sub-model can quantify the interference influence by analyzing related data acquired by the environment sensing module for interference factors such as impurities and temperature gradient in a medium, so that the interference compensation precision is improved. The compensation term is generated and fused into the light propagation equation, so that the light propagation path is corrected, the calculation accuracy of the light propagation path is ensured, a firm and reliable data support is provided for subsequent image recognition and correction, and the precision and quality of image recognition and correction are improved.
Owner:上海思来氏信息咨询有限公司

Deep ultraviolet light emitting diode with light scattering structure and preparation method thereof

The invention relates to a deep ultraviolet light-emitting diode with a light scattering structure and a preparation method of the deep ultraviolet light-emitting diode. The light-emitting diode comprises a substrate layer, a buffer layer and an N-type semiconductor transmission layer which are sequentially arranged along the epitaxial growth direction of a chip, wherein the shape of the N-type semiconductor transmission layer is divided into an upper part and a lower part, and the multi-quantum well active layer, the P-type semiconductor transmission layer and the P-GaN contact layer sequentially cover the surface of the upper part of the N-type semiconductor transmission layer; a horizontal light scattering structure layer and a vertical light scattering structure are respectively distributed in the upper part and the lower part of the N-type semiconductor transmission layer. According to the invention, the scattering effect of light in the N-type semiconductor transmission layer is improved, the optical waveguide effect of the N-type semiconductor transmission layer is broken, the light is effectively prevented from spreading to the metal n electrode, meanwhile, the light can be scattered, the bottom light emitting efficiency of the deep ultraviolet LED is improved, and the light extraction efficiency is improved.
Owner:HEBEI UNIV OF TECH

Underwater image enhancement method based on double-domain attention U-Net

The invention provides an underwater image enhancement method based on a U-Net backbone network and fusing a position sensing module, a double-branch attention bridge and a DCT frequency domain enhancement module, and aims to solve the problems of low contrast ratio, color distortion, detail loss and the like caused by absorption and scattering effects in the light propagation process of an underwater image, improve the image quality and improve the image quality. And the visual perception effect is improved. The method specifically comprises the following four main steps: firstly, acquiring and preprocessing initial data sets of different underwater scenes; secondly, extracting spatial relation information of the image through a position sensing convolution module, and enhancing image details; thirdly, a double-branch attention bridge module is used for further integrating local details and a global structure, and the response capability of a key area is enhanced; and finally, in combination with RGB and NIR modal features, weighted fusion of frequency-space features is realized through a DCT fusion enhancement module, so that detail information of the image is recovered, color deviation is corrected, and the definition and visual effect of the underwater image are remarkably improved. According to the method, the enhancement performance of the underwater image in a complex environment can be improved, and powerful support is provided for applications such as underwater detection, target detection, object recognition and image segmentation.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Gasket structure capable of eliminating real-shot stray light

The invention discloses a gasket structure capable of eliminating real-shot stray light, which comprises the following steps of: S1, designing a chamfering structure, namely, accurately setting the thickness of an ultra-thin gasket to be 0.022 / 0.033 mm, manufacturing the chamfering structure in an inner hole, and performing rigorous optical simulation and experimental optimization; s2, material selection and surface treatment are coordinated, material screening focuses on the characteristics of low reflectivity and high optical stability, and optical-grade polycarbonate has good optical transparency, low refractive index and excellent mechanical performance. The light propagation path is changed through unique design, and the influence of stray light on imaging is reduced to the maximum extent. By effectively eliminating the stray light, the image contrast of the imaging system is improved, the definition is obviously improved, more image details can be clearly presented, and the application scene requirement harsh for the imaging quality is met. The reduction of stray light interference helps to reduce the noise level of an optical system, improves the stability and reliability of the system, reduces the equipment fault and maintenance frequency caused by the stray light problem, and reduces the use cost.
Owner:JIANGSU POWERTIP PHOTOELECTRIC CO LTD

Optical lens

The invention provides an optical lens, which consists of four lenses and a reflecting element, and sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from an object side to an imaging surface along a light propagation direction, the image side surface of the second lens is a concave surface; the third lens has positive focal power, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power; the reflecting element is a prism, the prism comprises an incident plane, a reflecting plane and an emergent plane which are all planes, and light enters the prism from the incident plane along an optical axis, is reflected by the reflecting plane and exits from the emergent plane to an imaging plane; and an included angle of 45 degrees is respectively formed between the reflecting surface and the optical axis of the incident surface and between the reflecting surface and the optical axis of the emergent surface. According to the optical lens, the multiple lenses are combined and matched with the reflecting element, the periscopic long-focus effect is achieved, and the optical lens has the advantages of being small, light and thin.
Owner:JIANGXI LIANYI OPTICS CO LTD

Optical transmitter

Provided is an optical transmitter having high manufacturing stability and a high reflection suppression effect. In the optical transmitter, a distributed feedback (DFB) laser having an active region formed as a multiple quantum well that generates an optical gain by current injection and a diffraction grating, an electro-absorption (EA) modulator having an absorption region formed as a multiple quantum well having a composition different from a composition of the DFB laser, a semiconductor amplifier (SOA) having an active region having a same composition as the composition of the DFB laser, a bent waveguide that rotates a light propagation direction by an angle θwg, and a passive waveguide connected to the SOA and including a core having a band gap wavelength shorter than an oscillation wavelength of the DFB laser are monolithically integrated on one substrate. The passive waveguide has a tapered region and a narrow waveguide region. The tapered region converts a width W1 of the passive waveguide connected to the SOA into a width W2 of the narrow waveguide region, and the passive waveguide forms the angle θwg with respect to a normal line to an end surface of the substrate and is in contact with the end surface of the substrate.
Owner:NT T INC

Phase front shaping in one and two-dimensional optical phased arrays

Aspects of the present disclosure describe optical phased array structures and devices in which hyperbolic phase envelopes are employed to create focusing and diverging emissions in one and two dimensions. Tuning the phase fronts moves focal point spot in depth and across the array. Grating emitters are also used to emit light upward (out of plane). Adjusting the period of the gratings along the light propagation direction results in focusing the light emitted from the gratings. Changes in the operating wavelengths employed moves the focal spot along the emitters.
Owner:ANALOG PHOTONICS LLC

Optical device

The optical device includes a substrate and an optical waveguide formed on the substrate, a protrusion portion is formed on the substrate adjacent to the optical waveguide. Accordingly, an optical device which can achieve further suppression of the light propagation loss and higher reliability is provided.
Owner:TDK CORP

Optical fiber end face integrated microcavity sonic sensor

The invention relates to the technical field of ultrasonic sensors, and discloses an optical fiber end face integrated micro-cavity sonic sensor which comprises a seven-core optical fiber, two light propagation waveguides, a coupling waveguide, a supporting assembly, a micro disc, a light emitter and a photoelectric detector, the two light propagation waveguides are arranged on the end face of the seven-core optical fiber, the coupling waveguide is arranged between the two light propagation waveguides, and the supporting assembly is arranged on the end face of the seven-core optical fiber. A supporting assembly is arranged on the end face of the seven-core optical fiber, a micro disc is arranged on the top of the supporting assembly, and the first fiber core and the second fiber core are connected with an external light emitter and an external photoelectric detector respectively. The wavelength of the laser output by the light emitter is locked at the linear slope of the micro-disk harmonic peak, the radius and the effective refractive index of the micro-disk are changed through the action of ultrasonic waves on the micro-disk and vibration, the harmonic peak drifts and the intensity of the output laser is changed, and then the ultrasonic waves are detected; compared with the prior art, ultrasonic waves are detected through a micro-disk resonance and laser sideband locking method, and the problem of electromagnetic interference can be effectively avoided by utilizing the optical principle.
Owner:SHENZHEN UNIV

Laser positioning device for molding press and use method of laser positioning device

The invention discloses a laser positioning device for a molding press and a using method of the laser positioning device, and relates to the technical field of molding press positioning, the laser positioning device comprises a molding press body, supports are fixedly connected to the two sides of the bottom of the molding press body, supporting frames are arranged on the front face and the back face of the molding press body, and shading glass is fixedly connected to inner cavities of the supporting frames. The support is arranged and used for supporting the molding press body, the supporting frame is used for fixing the shading glass, and the shading glass is dark and can reduce light propagation, so that a certain shading effect can be achieved, the influence of external light on an internal working area of the molding press body is reduced, and the positioning accuracy is improved; the placing block is used for placing the workpiece to be machined, the positioning mechanism is used for adjusting the position of the placing block so as to achieve the purpose of accurate positioning, and the damping mechanism can reduce the vibration amplitude of the molding press body during operation, so that the influence of vibration on normal operation of equipment is reduced.
Owner:WUXI ZHONGHENG NEW ANTI-COUNTERFEITING TECH CO LTD

Light-emitting super-structure surface capable of realizing incoherent fluorescent holography and multi-dimensional super-structure display and preparation method of light-emitting super-structure surface

The invention discloses a light-emitting super-structure surface capable of realizing incoherent fluorescence holography and multi-dimensional super-structure display and a preparation method thereof. The light-emitting super-structure surface is mainly composed of an optical waveguide structure layer, a micro-nano structure layer and a fluorescence emission layer. The optical waveguide structure layer comprises a substrate and a waveguide layer and is responsible for guiding fluorescence propagation; the micro-nano structure layer is located above the waveguide layer, is composed of nano bricks and can regulate and control light; the fluorescence emission layer is arranged above the micro-nano structure layer, contains quantum dots and is excited by the pump light to emit fluorescence. The metasurface can regulate and control the emergent angle, wavefront and emergent intensity of fluorescent light and pump light, the time-space coherence of the fluorescent light is enhanced through the waveguide layer, and phase modulation is carried out by using a method based on a circuitous phase. Based on the super-structure surface, through the steps of fluorescence excitation, coherence enhancement, phase modulation, diffraction calculation, hologram generation, multi-dimensional display and the like, incoherent fluorescence hologram and multi-dimensional super-structure display can be achieved, and the functions of fluorescence nanometer printing and multi-channel holographic display are covered.
Owner:WUHAN UNIV

Blurred image NeRF modeling method, system and device based on scattering light path model and medium

The invention discloses a blurred image NeRF modeling method, system and device based on a scattering light path model and a medium. The modeling method comprises the steps of blurred image initial pose calculation, camera pose interpolation, neural radiation field NeRF-based 3D scene modeling, scattering light parameter learning guided by an internal scattering light path model, blurred image synthesis prediction by using a scattering sensing volume rendering method, and parameter joint optimization based on blurred image luminosity loss. The system, the equipment and the medium are used for implementing the method. A light propagation phenomenon is represented as internal scattering of light at a medium or surface intersection point through an internal scattering light path model, a scattering light path direction and a sampling point distance are autonomously learned by means of a feedforward neural network, and image rendering is performed by integrating contributions of sampling points in the directions of a main light path and the scattering light path. The real imaging process of a blurred image in a complex illumination environment can be effectively simulated, the geometric ambiguity problem is effectively avoided, the convergence stability of the neural network is improved, and a finer reduction effect on geometric details of a fine object is achieved.
Owner:XIDIAN UNIV

4K fluorescent endoscope optical system

The utility model relates to a 4K fluorescent endoscope optical system, which comprises an objective lens system, a relay lens system and an eyepiece system which are sequentially arranged along the light propagation direction, and is characterized in that the objective lens system is of a reverse long-distance structure; the system comprises a sapphire protection lens, a negative focal power lens, a prism or a steering prism, a positive focal power plano-convex cemented lens, a positive focal power triple cemented lens and a first positive focal power double cemented lens which are arranged along a light propagation direction, the relay lens system comprises n relay lens groups, and each relay lens group is of a double telecentric structure. And the eyepiece system is arranged in the light transmission direction and is formed by symmetrically arranging two doublet rod lenses, n is an odd number, the eyepiece system is of an object space telecentric structure, and the eyepiece system comprises a second positive-focal-power doublet lens, a positive-focal-power lens and a sapphire lens which are glued into a whole in the light transmission direction. The structure of an optical system can be simplified, production and processing cost can be reduced, and 4K ultra-high-definition fluorescent laparoscopic imaging can be realized at the same time.
Owner:EAGLESCOPE MEDICAL TECH CO LTD

Large-view-field visible light to near-infrared continuous zooming optical system

The invention relates to a large-view-field continuous zooming optical system from visible light to a near-infrared band. The system is sequentially provided with a front fixing group with positive focal power, a zooming group with negative focal power, a compensation group with positive focal power, a rear fixing group with negative focal power and an image plane I in the light propagation direction; wherein the zoom group is composed of a meniscus lens with negative focal power and a doublet lens; and the compensation group consists of a meniscus lens with positive focal power, a meniscus lens with negative focal power and a doublet lens with positive focal power. According to the invention, two groups of doublet lenses in different forms are adopted, a negative lens in one group of doublet lenses is crown glass with low refractive index and high Abbe number, and a positive lens in one group of doublet lenses is flint glass with high refractive index and low Abbe number; and in the other group of glued lenses, the negative lens is flint glass with high refractive index and low Abbe number, the positive lens is crown glass with low refractive index and high Abbe number, and the two types of glued lenses effectively control high-order spherical aberration caused by a large view field, correct field curvature and suppress chromatic aberration caused by a wide spectral range.
Owner:CHANGCHUN JINGYI PHOTOELECTRIC TECH CO LTD

Building light environment neural network control system based on BIM

The invention discloses a building light environment neural network control system based on BIM, relates to the technical field of building intelligent control, and is used for solving the problem of poor intelligent illumination adaptive control. The method comprises the following steps: constructing a structure enhanced semantic map based on a BIM model, extracting a spatial structure attribute and a communication relationship to generate a node vector and an edge weight, and describing an illumination propagation relationship; the method comprises the following steps: constructing an original state vector by fusing sensing data and structural information, carrying out time sequence modeling by adopting a gated recurrent neural network, dividing four types of subspaces to express environment evolution characteristics, identifying a lighting task scene according to a current activity and time period, matching a control target, reasoning an adjustment direction, and screening a candidate action path; according to the method, the optimal strategy is generated and executed, user feedback is collected to construct behavior response factors, user preferences are updated, a preference closed-loop mechanism is constructed, illumination control cooperatively driven by structure perception, state evolution and user preferences is achieved, and the comfort, intelligence and energy saving performance of the building light environment are improved.
Owner:ZHEJIANG RUILIN LANDSCAPE ENG CO LTD

Multi-strip-loaded optical waveguide

A strip-loaded optical waveguide includes a slab layer, a strip layer, and a cladding region. The slab layer has a first optical refractive index and a first width measured in a transverse direction that is perpendicular to a light propagation direction through the strip-loaded optical waveguide. The strip layer is disposed above the slab layer. The strip layer has a second optical refractive index and a second width as measured the transverse direction. The second width is less than the first width of the slab layer. The second optical refractive index is less than the first optical refractive index of the slab layer. The cladding region is disposed above the slab layer and above the strip layer. The cladding region has a third optical refractive index that is less than the second optical refractive index of the strip layer.
Owner:AYAR LABS INC

Airy beam attenuation compensation method based on neutral density filter and imaging system

The invention discloses an Airy beam attenuation compensation method based on a neutral density filter and an imaging system, and belongs to the technical field of microscopic imaging, the method comprises the following steps: shaping and filtering a light beam emitted by a light source through a shaping device, and then generating an Airy beam; light beams pass through a neutral density optical filter, and attenuation compensation of different degrees is achieved on the light beams at different positions on a light beam propagation transverse plane; enabling the light beam to pass through a scanning galvanometer to form a light sheet, enabling the light beam to enter from one side of the sample, and exciting the sample to generate a fluorescence signal; the sample is imaged, an imaging result is collected through a camera, and the light intensity change in the exciting light propagation process is analyzed; and measuring an attenuation coefficient by adopting a biological spectrophotometer, and determining parameters of the neutral density filter. According to the attenuation compensation method, the advantages of Airy beams are combined, and a new optical element (neutral density filter) is introduced to achieve the purpose of attenuation compensation.
Owner:TIANJIN UNIV

Optical fiber with a tapered core

In some implementations, an optical fiber may include a core and a cladding surrounding the core. The core and the cladding may provide light guidance along the optical fiber in a light propagation direction. The core may have a taper in the light propagation direction in a section of the optical fiber. A diameter of the core may decrease independently of a diameter of the cladding in the section of the optical fiber.
Owner:WELLS FARGO BANK NA

Inspection image enhancement method for safety production

The invention specifically relates to an inspection image enhancement method for safety production, and relates to the technical field of image processing, and the method comprises the steps: collecting and preprocessing multi-source data; mie scattering characteristic analysis and transmissivity theoretical calculation; a transmissivity correction model driven by on-site concentration; carrying out image enhancement and noise reduction processing; and performing model optimization and safety production scene verification. According to the method, multi-source data acquisition and preprocessing comprehensively cover a safety production scene, and the influence of particulate matters on light propagation is accurately described by combining a Mie scattering theory and a transmissivity correction model driven by field concentration; actual interferences such as non-spherical particles, agglomeration effect and airflow unevenness are fully considered, and a pixel-level accurate transmissivity matrix is generated; differentiated noise processing is carried out for scenes with different concentrations, and key information such as equipment defects is effectively restored in combination with a detail enhancement strategy; the method provides a more reliable clear image for safety production inspection, assists inspection personnel and algorithms in accurately identifying hidden dangers, reduces the risks of missing inspection and false inspection, and guarantees the production safety.
Owner:HUNAN XIAOXIANGJUNAN SAFETY TECHNOLOGY CO LTD

Optical Transmitter

An optical transmitter includes a distributed feedback (DFB) laser having an active region formed as a multiple quantum well (MQW) and a diffraction grating, an electro-absorption (EA) modulator having an absorption region formed as a MQW having a composition different from a composition of the DFB laser, a semiconductor amplifier (SOA) having an active region having a same composition as the composition of the DFB laser, a bent waveguide that rotates a light propagation direction, and a passive waveguide connected to the SOA and including a core having a band gap wavelength shorter than an oscillation wavelength of the DFB laser. A tapered region of the passive waveguide converts a width W1 of the passive waveguide connected to the SOA into a width W2 of a narrow waveguide region of the passive waveguide, and the passive waveguide is in contact with the end surface of the substrate.
Owner:NT T INC

Image rotation control using reflective waveguide facets

Techniques for implementing image rotation control using reflective waveguide facets in an AR eyewear display system are disclosed. A facet (602) is disposed in a light propagation path located between a first surface (S1) and a second surface (S2) of a waveguide (600) and is arranged to guide propagation of light for a display through the facet from the first surface to the second surface. Using this configuration, light is transmitted through the facet as it guides propagation of the light from the first surface to the second surface, which reduces the amount of image rotations or inversions that would otherwise be induced in the waveguide using conventionally oriented facets and thus simplifies or optimizes the design of other aspects of an AR eyewear display system, such as display source placement or orientation or form-factor bulkiness.
Owner:GOOGLE LLC

Metastructure lens condenser and microscopic imaging lighting device

The invention provides a super-structure lens condenser and a microscopic imaging lighting device, and belongs to the technical field of microscopic imaging. The technical problems that a traditional Kohler illumination collecting lens is large in caliber, thickness and weight, high in price and not beneficial to light weight and miniaturization of a microscopic system are solved, the technical scheme is that the super-structure lens collecting lens achieves abrupt change of a light field phase through interaction of a micro-nano structure and the light field, and the light field phase change is achieved through the super-structure lens collecting lens. Therefore, the light propagation direction is changed, and the micro-nano structures of the plane lens and the super-structure lens condenser for realizing light beam convergence are periodically arranged according to a certain interval. The beneficial effects are that the super-structure lens is utilized to perform light beam deflection and convergence on a plane by utilizing phase mutation, the limitation that a traditional lens needs a convex surface type or a plurality of lenses to realize large numerical aperture condensation is solved, the limitation on the surface curvature and the transverse size during processing is solved, the longitudinal size of the condensing lens is reduced, and the processing efficiency is improved. And miniaturization of a microscopic imaging system is facilitated.
Owner:NANZHIXINSHI (NANJING) TECHNOLOGY CO LTD

Method and device for regulating and controlling coherence process of perovskite nanocrystal excitons through magnetic field

The invention belongs to the technical field of perovskite nanocrystals, and particularly relates to a method and device for regulating and controlling the coherence process of perovskite nanocrystal excitons through a magnetic field. The method comprises the steps that incident light beams of pump light and detection white light pass through perovskite nanocrystals at low temperature, a magnetic field is applied in the light propagation direction, the linear polarization eigenstate in the perovskite nanocrystals is converted into the elliptic polarization eigenstate through the magnetic field, and the elliptic polarization eigenstate approaches the circular polarization eigenstate along with increase of the magnetic field; the beat frequency dynamic learning of the perovskite nanocrystal under circular polarized light pumping-detection is gradually weakened; under the pumping-detection of linearly polarized light, the beat frequency dynamic learning of the perovskite nanocrystal is gradually enhanced; the eigenstate and beat frequency dynamics of the perovskite nanocrystal are regulated and controlled by adjusting the magnetic field intensity. According to the method, the band edge exciton eigenstate of the perovskite nanocrystal is regulated and controlled by changing the magnetic field intensity, and the change of the band edge exciton eigenstate can cause the change of the coherent state dynamics process, so that the coherent state dynamics regulation and control of the perovskite nanocrystal can be realized by regulating the magnetic field intensity.
Owner:DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES

Calibration system and method for integrated optical phased array chip

A calibration system and related methods for optical phased array chips. The calibration system includes an adjustable mount module, an infrared microscopic observation module, an arrayed driver module, a two-dimensional laser beam scanning module, a photoelectric conversion module and an upper computer, and utilizes computer-vision-enabled positioning and phase error compensation algorithms as software components. Collimated laser is emitted from the target beamforming angle and aimed at the emission aperture of the chip, and is subsequently sampled by the array elements in a reversed injection manner. Based on the reciprocity of light propagation, by maximizing the power reversely output from the bus waveguide of the optical phased array chip, beamforming at the target angle is achieved supported by software implementations of optimization algorithms. The system and related methods are readily achievable, highly automated, and offers fast and batch calibration with relatively low expenses, good flexibility and long-term compatibility.
Owner:SHANGHAI JIAOTONG UNIV