382 results about "Refractive index profile" patented technology

The invention discloses a naked-eye 3D display optimization method based on real-time eyeball tracking, and particularly relates to the technical field of naked-eye 3D display, and the method comprises the steps: capturing eyeball movement data in real time through a visual angle tracking sensor, and collecting illumination information in combination with an ambient light sensor; depth perception parameters are calculated based on pupil diameter variation and frequency, and a time sequence prediction type dynamic compensation coefficient is generated in combination with eyeball movement acceleration; acquiring an initial fixation point coordinate by using an improved spherical projection mapping model, and performing compensation coefficient correction to obtain a real-time coordinate; and finally, according to the real-time coordinates, dynamically adjusting the refractive index distribution of the nanostructure layer, the rotation angle of the polarizer, the focal length of the optical lens and other optical modulation parameters. The real-time distance is calculated through the binocular parallax algorithm, the depth mapping value is generated by combining the focal length of the camera and the baseline distance, the method can adapt to the illumination change and the user view angle, and the 3D display effect is optimized.

The invention provides an optical switch, an optical switch assembly and an optical switch integrated component, and belongs to the technical field of optical communication. The optical switch provided by the invention comprises an input waveguide, a multi-mode waveguide and a plurality of output waveguides which are connected in sequence, the optical switch further comprises a plurality of strip-shaped electrodes located on one side of the multi-mode waveguide, and the plurality of strip-shaped electrodes can modulate an optical field propagation path in the multi-mode waveguide. The optical switch adopts a planar waveguide structure, and an optical field propagation path in the multimode waveguide can be modulated through the electrodes, so that the structure of the optical switch is effectively simplified, and the number of output ports is convenient to expand. Moreover, the optical switch adjusts the refractive index distribution of the multi-mode waveguide through the electrode, so that modulation of a light field propagation path is realized, the working range of the input wavelength of the optical switch is not limited, and wide-wavelength working can be realized.

A method of manufacturing a CdTe-based thin film solar cell device having a graded refractive index profile within a CdTe (cadmium telluride)-based absorber layer, comprising the steps of: a) providing a transparent substrate comprising a front electrode, b) forming a doped CdTe-based absorber layer on the substrate, c) performing an activation treatment after step b). The doped CdTe-based absorber layer in step b) is a doped CdTe-based absorber layer stack comprising a first layer and a second layer. The first layer is a first doping element-containing layer including vanadium as a first doping element, which is formed by depositing a first doping element-enriched layer followed by depositing a CdSe (cadmium selenide) layer or a CdSeTe (cadmium selenium telluride) layer, or by depositing a CdSe layer or a CdSeTe layer each doped with a first doping element. The second layer is formed by depositing a CdTe layer. The invention also relates to a CdTe-based thin-film solar cell device with gradient refractive index distribution.

The invention provides a Mach-Zehnder interferometer optical fiber sensor based on an arc-shaped concave cavity single-mode optical fiber. The device is characterized by comprising an incident optical fiber 1, a beam splitter 2, an interference arm 3, a beam combiner 4 and an emergent optical fiber 5 which are connected in sequence. The incident optical fiber 1 is used for transmitting an input optical signal, the beam splitter 2 couples the optical signal in the incident optical fiber 1 into the interference arm 3, the interference arm 3 is used as a transmission waveguide, three arc-shaped concave cavities with different depths and curvature radiuses are arranged in the interference arm 3, and when a solution to be detected is immersed in the concave cavities, the refractive index change modulates an interference spectrum through an optical path difference and a phase difference; according to the design of the three concave cavities, refractive index distribution of three independent positions in the reaction process can be measured at the same time, the beam combiner 4 recombines optical signals in the interference arm 3 and couples the optical signals into the emergent optical fiber 5, and the emergent optical fiber 5 is responsible for outputting the optical signals and transmitting the optical signals to detection equipment for analysis. According to the invention, multi-position synchronous detection is realized through the multi-cavity gradient sensitive characteristic and in combination with the femtosecond laser micromachining technology, the problem of accidental errors of a traditional single-position sensor is solved, and the sensor is suitable for scenes such as microfluidic reaction requiring dynamic monitoring of refractive index change.

The invention presents a lensless Fourier ptychographic diffraction tomography microscopy imaging method based on wavelength scanning. The technique uses only a wavelength-tunable light source for illumination on a lensless microscope experimental system to collect a series of coaxial holograms. Then, the three-dimensional scattering potential spectrum is filled using an iterative Fourier ptychographic method to restore the three-dimensional refractive index distribution of the sample directly. The present invention does not require complex modifications to traditional lensless on-chip microscopes. It can endow lensless on-chip microscopes with the ability of pixel super-resolution three-dimensional tomographic imaging.

The invention provides an aerodynamic optical transmission model construction method, system, device and medium, and the construction method comprises the steps: obtaining the refractive index distribution of a flow field around an aircraft, constructing a flow field lens model, obtaining the temperature distribution of an optical system, and obtaining the relative refractive index distribution of a ray tracing point; the flow field lens model and the optical lens model are combined to form an equivalent lens superposition model, the input of the equivalent lens superposition model is set parameters, refractive index distribution, temperature distribution and relative refractive index distribution of the optical system, and the output of the equivalent lens superposition model is light transmission distortion characteristics. According to the method, the flow field lens model and the optical lens model are combined to simplify the model, and the whole output process of the light in the flow field and the optical lens can be directly calculated by adopting an equivalent lens method, so that the calculation efficiency can be greatly improved.

The invention relates to the technical field of aerospace meteorology, and particularly discloses a domestic numerical weather forecast mode-based evaporation waveguide height determination method, which comprises the following steps of: obtaining meteorological coupling data output by a domestic numerical weather forecast mode CMA-MESO; determining parameters according to the meteorological coupling data and a turbulent flux algorithm COARE; constructing a temperature vertical profile and a specific humidity vertical profile according to the parameters, the Monin-Obchhoff similarity theory and an NPS model; constructing a modified refractive index profile according to the temperature vertical profile and the specific humidity vertical profile; and determining the height of the evaporation waveguide according to the height corresponding to the lowest point of the corrected refractive index profile. The method is suitable for determining the evaporation waveguide height in a domestic business meteorological mode.

The invention relates to the technical field of acoustic functional devices, and discloses an acoustic black hole lens based on a three-dimensional radial gradient refractive index phonon crystal structure and a design method, a three-dimensional radial gradient refractive index distribution function n (r) with a center convergence characteristic is constructed, and incident sound waves are continuously guided and efficiently focused to the center of the lens in the propagation process; combining the feasibility constraint of an additive manufacturing process, designing a few-negative micro-lattice structure unit for realizing the gradient refractive index distribution, and determining key geometric parameters of the few-negative micro-lattice structure unit; according to the refractive index distribution function n (r), radially arranging the micro-lattice units in a three-dimensional space, and constructing an initial lens model; the sound field distribution, focusing performance and energy convergence efficiency of the model are verified and iteratively optimized in a mode of combining analytical modeling and finite element method simulation, and a three-dimensional radial gradient refractive index photonic crystal acoustic black hole lens design model with wide-angle incidence compatibility and broadband response capability is obtained.

The invention relates to the field of marine atmospheric waveguide environment detection, and discloses a method for predicting a marine atmospheric correction refractive index profile, which comprises the following steps of: acquiring meteorological observation data at different heights; calculating an evaporation waveguide height prediction value and a reference atmosphere correction refractive index profile; constructing a fusion relation model of the critical gradient of the bit refractive index and meteorological observation data; inputting meteorological observation data into the fusion relation model to obtain a critical gradient of a refractive index of a prediction bit, calculating a critical gradient of a refractive index of a reference bit, and obtaining an optimal weight coefficient of the model through iteration by using a particle swarm intelligent optimization algorithm; and inputting meteorological observation data into the optimized fusion relation model, calculating an optimized bit refractive index critical gradient, and finally obtaining an optimized atmosphere correction refractive index profile. According to the method disclosed by the invention, the influence of different meteorological conditions on the critical gradient of the refractive index is considered in the calculation process of the atmospheric correction refractive index profile, and the prediction precision of the atmospheric correction refractive index profile is improved.

The invention discloses a distributed ground-based radar atmospheric refraction error calculation method for celestial body observation. According to the method, a local numerical weather forecast model is corrected by using real-time surface meteorological parameters, atmospheric refractive index profile data containing elevation meteorological information is obtained, a geometric elevation angle of a celestial body target is taken as a standard, and a neutral atmospheric refractive index error is searched in combination with a corrected data source and a ray tracing method, so that the atmospheric refractive index is obtained. And finally, neutral atmospheric refraction error calculation and correction are realized. The effectiveness of the algorithm is verified through simulation.

The invention discloses a vortex ultrasonic transducer, an acousto-optic coaxial modulation method and an analogue simulation method, and relates to the technical field of acousto-optic modulation.The method comprises the steps that a focused vortex sound field is generated through the vortex ultrasonic transducer with a center perforated hole, sound beams and light beams are coaxially propagated in the same direction, the sound field is used for regulating and controlling medium refractive index distribution, and the sound field is used for generating a focused vortex sound field; and light beam focusing spiral propagation and scattering suppression are realized. A model is constructed through analogue simulation, and the regulation and control effect of the sound field on the light beams is analyzed. According to the invention, coaxial modulation of the vortex sound fields with different topological charges on the light beams is realized, and a new path is provided for research of an acousto-optic regulation and control technology.

Disclosed are a method, a device, and an information processing program for determining, by using refractive index distribution data pertaining to an object to be observed, the region of a cell that has undergone programmed cell death in the object to be observed.

The invention discloses an offshore floating type low-altitude waveguide all-weather detection method and system, and relates to the technical field of marine environment monitoring and electronic information engineering.The method comprises the steps that the current weather condition is judged according to a rain intensity sensor, a miniature weather station, a visibility sensor and an infrared cloud measurement sensor; obtaining a temperature and humidity value range according to the current weather condition, and adding liquid water for correction according to the weather condition; a simulated brightness temperature is obtained according to a MonoRTM model by combining an air pressure profile constructed by sea surface air pressure and a pressure height formula; designing a multi-objective genetic inversion algorithm, constructing an objective function, and when the objective function obtains a minimum value, obtaining an inverted atmospheric parameter profile group; and according to the atmospheric parameter profile group, calculating an atmospheric refractive index profile, judging whether a low-altitude waveguide occurs or not, and uploading a result to a shore station data management center. According to the invention, the atmospheric absorption coefficient is corrected according to different weathers, and all-weather and high-precision monitoring of the low-altitude waveguide on the offshore floating platform is realized.

A film (1), an ophthalmic lens comprising the film (1), eyeglasses comprising an ophthalmic lens comprising the film (1), and a method of manufacturing the film (1) are described. The film (1) has a basic refractive index and comprises at least one gradient index optical element (7a, 7b) having an asymmetric refractive index profile.

The invention discloses an inversion method for obtaining an N2O gas volume mixing ratio profile based on a short-wave infrared laser occultation detection technology. The inversion method comprises the following steps: calculating a short-wave infrared atmospheric refractive index profile at the center position of an N2O gas absorption spectral line; calculating a collision parameter profile according to the short-wave infrared atmospheric refractive index profile, respectively calculating atmospheric transmittance profiles of an N2O gas absorption spectral line and a reference spectral line based on normalized energy data of infrared laser occultation detection, and executing Abel integral inverse transformation on a difference value between the atmospheric transmittance profiles to obtain an N2O gas absorption coefficient profile; converting the N2O gas absorption coefficient profile into an N2O gas initial volume mixing ratio profile; and by taking the N2O gas initial volume mixing ratio profile as an initial value, carrying out analog calculation on an atmospheric transmittance profile after N2O gas absorption, constructing a cost function, carrying out iterative optimization, outputting an N2O gas volume mixing ratio profile, and obtaining a final inversion result. According to the method, the inversion precision is improved.

The invention provides an optical diffraction tomography resolving method, device and equipment, and belongs to the technical field of optical diffraction tomography. The method comprises the following steps: acquiring an off-axis interference image of a target sample; preprocessing the off-axis interference image to obtain a target refractive index distribution diagram; and taking the target refractive index distribution diagram as input, carrying out iterative reconstruction on the refractive index distribution condition of the target sample through a preset algorithm until the difference between a theoretical scattered field calculated based on the refractive index distribution condition and an actual scattered field measured by an experiment meets a preset condition, and obtaining a resolving result diagram, the preset algorithm is generated by combining total variation regularization and a beam propagation method, and is realized by using a GPU (Graphics Processing Unit) under CUDA (Compute Unified Device Architecture). High-precision and high-efficiency recovery of the three-dimensional refractive index of a sample is realized, and the resolving efficiency and accuracy of optical diffraction tomography are improved.

According to the deep ultraviolet laser epitaxial structure and the epitaxial growth method thereof provided by the invention, the Al component of the first waveguide layer is linearly and progressively increased from the side close to the electron injection layer to the side close to the quantum well active layer; or the Al component of the second waveguide layer is linearly and progressively decreased from the side close to the quantum well active layer to the side close to the hole injection layer to form refractive index distribution which takes the barrier layer of the quantum well active layer as the highest refractive index point and gradually decreases towards one side (the n-type side or the p-type side), so that the light field is firmly bound near the quantum well active layer, and the light limiting capability is remarkably enhanced; meanwhile, high-low Al components of the p-type side (the second waveguide layer) gradually change to generate a strong polarization electric field, ionization of a p-type doped acceptor (such as Mg) can be promoted, two-dimensional hole gas (2DHG) can be induced, and the hole concentration is improved; the low-high Al components of the n-type side (the first waveguide layer) are gradually changed, so that two-dimensional electron gas can be induced, and the electron concentration is improved.

A refractive index distribution generation device includes a processor and a memory. The processor performs a refractive index distribution generation process of generating a refractive index distribution corresponding to a processing-target image. The refractive index distribution generation process includes an input process of inputting, from the memory, the processing-target image, first refractive index information indicating a refractive index of a first structure, and second refractive index information indicating a refractive index of a second structure different from the first structure, and a setting process of setting respective refractive indexes that constitute a refractive index distribution. The setting process includes a first setting process of setting a refractive index based on the first refractive index information at a position corresponding to a first image region of the processing-target image on the basis of a signal intensity, and a second setting process of setting a refractive index based on the second refractive index information at a position corresponding to an image region different from the first image region of the processing-target image. The first image region is an image region corresponding to the first structure.

The invention discloses a manufacturing process of a COB (Chip On Board) process circuit board for photoelectric display. The manufacturing process comprises the following steps: performing constant-amplitude direct-current driving on a light-emitting chip array before injection of packaging glue to obtain full-board light field baseline data; the refractive index distribution of the packaging adhesive is regulated and controlled through multi-phase current pulses after the packaging adhesive is injected; forming a composite structure of a high-refractive-index chip interconnection interface and a low-refractive-index packaging surface by using Joule heat in a packaging adhesive crosslinking stage; the metal surface roughness is adjusted through nanosecond cosine pulses so as to control the plasma resonance characteristic; and finally, carrying out fine adjustment on the local refractive index by utilizing the interaction of the moving ions and the polar side chain. According to the technical scheme, stable refractive index distribution can be formed in the chip packaging structure through multi-physics field coupling regulation and control, formation of sub-wavelength stray light waveguides is effectively restrained, the problems of dynamic color cast and brightness flicker in an ultra-small pixel pitch COB display device are solved, and the optical performance consistency of the device is improved.

The invention relates to the field of radio transmission, and discloses an evaporation waveguide-based beyond-visual-range communication parameter dynamic adjustment method, which comprises the following steps of: installing a meteorological sensor and a hydrological sensor at a specified height of an offshore launching platform, and obtaining meteorological and hydrological data at the specified height; calculating to obtain an evaporation waveguide height diagnostic value and an atmospheric correction refractive index profile by using the obtained meteorological and hydrological data; according to the obtained atmosphere correction refractive index profile, the lowest trapping frequency and the critical incident angle in the current environment are obtained through calculation; determining a communication frequency range and antenna parameter ranges of the transmitting end and the receiving end; and searching in a communication frequency range and an antenna parameter range by adopting a particle swarm optimization algorithm to obtain the communication frequency with the minimum propagation loss and the optimal antenna parameter configuration. According to the method disclosed by the invention, the optimal frequency capable of carrying out beyond visual range communication in the evaporation waveguide environment can be output in real time, and the antenna parameters of the system are dynamically adjusted through the antenna servo system according to the meteorological and hydrological environment.

The invention provides a controllable processing method for a ring-by-ring femtosecond laser photoetching single crystal optical fiber cladding, and aims to solve the technical problems of low processing efficiency, limited processing length and the like in the prior art. The basic idea of the method is that a femtosecond laser is adopted to output annular femtosecond laser spots. On the basis, accurate control over the diameter and width of the annular light spot is achieved by moving the position of the spherical reflector in the system. And then the annular light spot is focused into the single-crystal optical fiber through a light path system and interacts with a specific local area of the single-crystal optical fiber, so that the refractive index of the area is reduced, and the inscribing of the inner cladding structure of the single-crystal optical fiber is successfully realized. According to the method, the inner cladding structure which is free of length limitation and uniform in refractive index distribution can be efficiently inscribed in the single crystal optical fiber.

The invention discloses an annular fiber grating manufacturing method and system for a high-order mode coupling fundamental mode, and the method comprises the steps: starting a femtosecond laser and corresponding equipment, and enabling the femtosecond laser and corresponding equipment to be in a standby state, so as to guarantee the stability of laser processing; a coating layer at the optical fiber processing position is stripped, the relative distance and height of the electric rotating clamps on the two sides are adjusted, so that the exposed part of the optical fiber is located between the electric rotating clamps on the two sides, and the horizontal and vertical positions of the electric displacement platform are adjusted; the grating period lambda, the rotating speed of the electric rotating clamp, the moving speed of the electric displacement platform, the interval time of opening and closing of the laser valve and the period number are preset on the computer; and executing a preset program, and forming annular fiber gratings periodically distributed along the fiber axis on the interface of the fiber core and the cladding. The annular fiber bragg grating inscribed by the method has circular symmetry performance, and the problem that mode coupling is influenced by random azimuth angles of a transverse mode field in a high-order mode influenced by non-uniform fiber refractive index distribution and external environment disturbance can be effectively avoided.

Systems and methods are provided for improving overall vision in patients suffering from a loss of vision in a portion of the retina (e.g., loss of central vision) by providing symmetric or asymmetric optic with aspheric surface which redirects and / or focuses light incident on the eye at oblique angles onto a peripheral retinal location. The intraocular lens can include a redirection element (e.g., a prism, a diffractive element, or an optical component with a decentered GRIN profile) configured to direct incident light along a deflected optical axis and to focus an image at a location on the peripheral retina. Optical properties of the intraocular lens can be configured to improve or reduce peripheral errors at the location on the peripheral retina. One or more surfaces of the intraocular lens can be a toric surface, a higher order aspheric surface, an aspheric Zernike surface or a Biconic Zernike surface to reduce optical errors in an image produced at a peripheral retinal location by light incident at oblique angles.

The invention relates to the technical field of optical waveguides, and particularly provides a polarization-independent prism coupling method and a waveguide structure, an optical anisotropic material is introduced into a substrate layer, a core layer and / or a cladding in a prism coupling waveguide, and a transverse electric mode and a transverse magnetic mode in the waveguide have the same effective refractive index by adjusting the refractive index distribution of the optical anisotropic material, so that the polarization-independent prism coupling method is realized. Different polarization states in the same light beam can be coupled into an optical waveguide at the same time, prism coupling is not limited by polarization sensitivity any more, the problem that a traditional prism coupling mode is limited by phase matching constraint is solved, and light of different polarization states in the same light beam has the optimal coupling angle.

The invention discloses an in-situ harmful gas monitoring method for sewage treatment plant structures, and particularly relates to the field of in-situ harmful gas monitoring, and the in-situ harmful gas monitoring method comprises the following steps: collecting refractive index disturbance data of a local gas-liquid-gas interface caused by bubble release in a sludge tank or an anaerobic tank, and forming a refractive index distribution field changing along with time; and modeling an infrared light propagation path based on the refractive index distribution field, executing infrared absorption inversion operation, solving a first concentration result of the harmful gas, and establishing a mapping relationship between the first concentration result and the refractive index distribution field. Through coupling calculation of a refractive index distribution field caused by bubble disturbance and an infrared absorption inversion process, a reciprocating iteration and time sequence prediction chain is constructed so as to correct dynamic optical distortion and stably solve the real release intensity of harmful gas.

The invention discloses a communication optimization method, device and system for an optical fiber optical splitter, and belongs to the field of optical fiber optical splitter communication, and the method comprises the steps: optimizing the refractive index distribution of the optical fiber optical splitter and a connection end face structure, and obtaining an adjusted optical splitter; calculating a coupling coefficient between different modes according to the geometric parameters and the real-time signal parameters of the adjusted optical splitter; according to the method, the asymmetric refractive index distribution and the structure of the optical fiber port can be adjusted, and then the coupling coefficients of different modes of the adjusted optical fiber splitter are calculated; the optical fiber splitter is optimized according to the coupling coefficient and the real-time communication parameter of the optical fiber splitter, so that the coupling coefficients of different modes of the optical fiber splitter meet actual requirements, the influence of signal distortion and attenuation during coupling is reduced, and the signal precision is improved.

A refractive index distribution evaluation method, evaluation device, and information processing program, comprising: a data acquisition step or a data acquisition unit for acquiring refractive index distribution data for an object of observation; a selection step or a selection unit for selecting whether a target included in the refractive index distribution data is an evaluation target; and an evaluation step or an evaluation unit for evaluating the refractive index distribution of the evaluation target.

A sample image generation device includes a memory and a processor. A first image is an image obtained by capturing an image of a sample. A predetermined direction in the first image is a direction in which a virtual observation optical system is present among optical axis directions of the virtual observation optical system. The processor acquires the first image from the memory, divides the first image into a plurality of areas, acquires a refractive index distribution of the sample from the memory, calculates a point spread function using the refractive index distribution, generates second images using the point spread function, combines the second images, and generates a third image corresponding to the first image. In the calculation process, the point spread function of a first area is calculated using the refractive index distribution of each area included in an area group. The first area is an area for which the point spread function is to be calculated. The area group is constituted of a plurality of areas inside a range in which light rays originating from the first area radiate in the predetermined direction.

The invention relates to the technical field of additive manufacturing, in particular to a photocuring printing scattering suppression method and system based on acousto-optic modulation. According to the method, in the photocuring printing process, an acousto-optic modulation device is used for generating a focused ultrasonic field in a printing material, specific refractive index distribution is formed in the material based on the photoelastic effect, and therefore a refractive index regulation and control area used for restraining and guiding scattered light propagation is constructed in a local space; therefore, the scattering effect is suppressed, and the forming precision and the structural fidelity are improved. The system comprises a photocuring device, a light source, a printing platform and an acousto-optic modulation device used for achieving the method, the acousto-optic modulation device is composed of an ultrasonic transducer and an acoustic lens, and the acousto-optic modulation device forms a focusing sound field under external excitation and works in cooperation with the light source. The method is suitable for photocuring printing of various high-scattering light-sensitive composite materials, comprises material systems containing particles, cells or components with remarkable refractive index difference, and has good material adaptability.

The invention provides a lens manufacturing method and system, a progressive lens and a repairing method. The repairing method comprises the following steps: coating photoresist on a lens substrate; and photoetching a preset micro-nano structure on the lens substrate through a photopolymerization reaction between laser emitted by a laser system and the photoresist to obtain the lens with the micro-nano structure in a preset layout mode, and realizing the required refractive index distribution of the lens through the micro-nano structure in the preset layout mode. The invention provides higher-precision processing capability, smoother refractive index transition and higher design and manufacturing flexibility, thereby meeting the requirements of the market for high-quality progressive lenses. The high-precision progressive lens manufacturing method provided by the invention is a solution provided aiming at the limitation of a traditional process, and aims to improve the optical performance of the progressive lens and the visual experience of a user.