33 results about "Diffraction effect" patented technology

To provide a technique capable of reducing the influence of the variation in the thickness of a resin cured material layer having projecting parts for developing diffraction action on the light utilization efficiency of a diffraction optical element.SOLUTION: The diffractive optical element 10 is used for at least one of division and shaping of a laser beam having a wavelength in a near-infrared region, and includes a substrate 11 that transmits the laser beam, and a cured resin layer 12 that is provided on the substrate 11 and transmits the laser beam, the cured resin layer 12 having a refractive index of 1.6 or less at a wavelength of 9400 nm, and generating a plurality of convex portions 12P that exhibit a diffractive action on a surface of the diffractive optical element 10, each of the plurality of convex portions 12P having a height H in a range of 1.4 μm or more and 1.7 μm or less, the width W is in a range of 0.4 μm or more and 1.0 μm or less.SELECTED DRAWING: Figure 1

The application discloses a long-wave infrared dynamic space modulation device and method based on double coding apertures, and belongs to the technical field of optics. The application avoids the diffraction effect in the long-wave infrared space modulation process by selecting a large-size coding pixel coding aperture, adopts a double coding aperture space light modulation structure, separately performs space modulation on target light beams, and realizes coding effect superposition through beam combination, so that the space modulation resolution of the large-size coding pixel coding aperture is improved. On the premise of guaranteeing the space modulation resolution requirement and without increasing the coding aperture area, the diffraction effect in the long-wave infrared space modulation process is avoided by selecting the large-size coding pixel coding aperture. The application introduces the use of a displacement table, and the position of the moving coding template is transformed for multiple times within the single information acquisition time of the system, so that the effective coding area in the optical path is transformed, more coding superposition effects are generated, and the coding resolution and the coding gray scale are further improved.

This invention claims protection for a laser device and optical path debugging method for acquiring micro-sized beams, belonging to the field of solid-state laser technology. The device structure includes: an indicator light source, a high-gain module, a micro-sized pinhole aperture, a micro-sized output mirror, and a micro-sized reflector. The debugging method consists of the following steps: S1: Determine the pitch and yaw of the micro-sized reflector using the indicator light source and the micro-sized pinhole aperture; S2: Determine the spontaneous emission light path of the high-gain module based on the micro-sized reflector and the two micro-sized pinhole apertures; S3: Add the micro-sized output mirror to achieve laser resonator oscillation based on the micro-sized cavity mirror. Because the cavity mirror is small enough, this invention eliminates the need for external pinhole beam contraction, reducing diffraction effects. Furthermore, by using an internal pinhole aperture to determine the optical path, it solves the problem of the spontaneous emission amplification optical path of the module not coinciding with the resonator oscillation optical path, improving output power and meeting the requirements for outputting micro-sized beams based on a high-gain module.

According to the laser generating device and the laser system, the image transmission device is introduced, the object image surface of the image transmission device is accurately overlapped with the two cavity reflectors of the resonant cavity, the important beneficial effects are achieved, the effective transmission distance of light waves between the two cavity reflectors is equivalently eliminated optically, and the laser generating device and the laser system have the advantages of being simple in structure and convenient to use. Therefore, the inherent diffraction effect and the mode selection capability of the resonant cavity are thoroughly inhibited; the direct result is that a large number of laser transverse modes with different orders are allowed to simultaneously meet oscillation conditions and start oscillation in a cavity, and light fields of the multiple transverse modes are combined into a large-mode-field output light beam with the spot size equivalent to the aperture of a gain medium after incoherent superposition. Moreover, the near-field energy distribution is converted from the conventional Gaussian distribution to super Gaussian distribution with a flat top and a steep edge.

The present disclosure relates to electronic devices having a display panel and a plurality of optoelectronic components, and in particular to mechanisms for mitigating diffraction effects when light is exchanged by such optoelectronic components through at least one transmissive region of the display panel. The display panel may be one of and include a layered semiconductor device that, in some non-limiting examples, may be an optoelectronic device having a plurality of (sub) pixel emission regions, each (sub) pixel emission region including a first electrode and a second electrode separated by at least one semiconductive layer.

The invention provides a method for realizing ultra-high-speed translation of a Bessel beam by using double acousto-optic modulation elements, which is characterized in that the displacement in the x-axis direction and the displacement in the y-axis direction are changed at a high speed by quickly switching radio frequencies f1 and f2, so that ultra-high-speed punching on the surface of a workpiece is realized; meanwhile, each hole has excellent morphology consistency due to vertical incidence, so that the problem of hole shape distortion caused by inclined incidence at the scanning edge of a traditional galvanometer is avoided; that is to say, the all-solid-state diffractive optical element is adopted, no mechanical moving part exists, the limitation of mechanical inertia is completely eliminated, the response time of light beam displacement only depends on the change speed of a driving signal and the establishment time of the diffraction effect, the MHz-level control effect can be easily achieved, and the speed is several orders of magnitude faster than that of a traditional galvanometer. The method is especially suitable for application scenes such as laser processing, optical tweezers, confocal microscopic imaging and high-speed optical switches.

The application discloses a kind of optical fiber side light extraction structure and method, belong to optical fiber side light extraction technical field, structure has including femtosecond grating light extraction component, filter component including filter layer and with slit light shielding layer, and detection component.The method includes: with grating diffraction separation optical signal in fiber core, with filter component filters optical signal, with detector receives signal.The application is by femtosecond laser in fiber core and writes small refractive index modulation area, with diffraction effect will transport light be introduced with specific angle to side, again cooperate external filter and metal slit and constitute spatial filter, physically block the stray light deviating from preset angle.This internal diffraction+external filter synergic mechanism avoids physical damage optical fiber surface, and realizes high purity, high directional signal extraction under micro size.

The present disclosure relates to electronic devices having a display panel and a plurality of opto-electronic components, and in particular, mechanisms for mitigating diffraction effects when exchanging light, by such opto-electronic components, through at least one transmissive region of the display panel. The display panel may be one of: be, and comprise, a layered semiconductor device, which in some non-limiting examples, may be an opto-electronic device, having a plurality of (sub-) pixel emissive regions, each comprising first and second electrodes separated by at least one semiconducting layer.

The embodiment of the application provides a wavelength selective switch, which comprises a dispersion element and a switching engine. The dispersion element can disperse multiplexed light input from an input port into a plurality of sub-beams in a dispersion plane and irradiate the sub-beams to the switching engine. The switching engine can deflect the plurality of sub-beams to form deflected sub-beams according to preset deflection angles in a switching plane, and output the deflected sub-beams from corresponding output ports. The deflection angles of one kind of wavelength beam and other wavelength beams are different, so that the one kind of wavelength beam can be separated and output from different output ports, and the scheduling and distribution of signal wavelengths are realized. The wavelength selective switch further comprises a first lens group. The first lens group can irradiate the multiplexed light to the dispersion element along a direction parallel to the dispersion plane in the switching plane, and irradiate the sub-beams dispersed by the dispersion element to the switching engine. The oblique incidence angle between the multiplexed light and the dispersion element is eliminated, the conical diffraction effect of the dispersion element is reduced, and the filter passband performance of the wavelength selective switch is improved.

Several aspects of the revelation concern an optical arrangement (100) comprising several holographic optical elements, HOE, (91, 92). At least one HOE disperses the light. For example, a deflecting HOE (91) directs light onto a diffuser HOE (92), where the light is dispersed by diffraction effects. By such a staggered arrangement of the two holographic optical elements (91, 92), the optical arrangement can, for example, be made particularly compact. Stray light can be reduced.

The invention discloses a method for determining the optimal size of a collimated light beam in a high-energy laser system. The method comprises the following steps: S1, acquiring basic parameters of the high-energy laser system; s2, establishing an electric field distribution model of the Gaussian beam on a diaphragm plane; s3, establishing an electric field distribution model after the Gaussian beam passes through the diaphragm; s4, establishing an electric field distribution model after the light beam is transmitted for a specified distance through the diaphragm; s5, establishing a light intensity distribution model after the Gaussian beam is transmitted for a specified distance through the diaphragm; s6, transmitting antenna parameters are converted into equivalent focusing parameters, and a focal plane electric field and focal spot light intensity distribution model of the Gaussian beam is established; and S7, selecting the waist radius of the input light spot. According to the invention, the efficiency waste caused by overlarge lens allowance and insufficient utilization of effective aperture in the prior art is avoided, and the problem that the energy distribution of light beams is influenced by diffraction effect caused by light cutting is solved.

This invention provides a method and system for locating microseismic sources in deeply buried tunnels, relating to the field of microseismic source location technology. The method includes: acquiring first, second, and third information; initializing a particle swarm based on the first, second, and third information to obtain an initial particle swarm parameter set; identifying diffraction paths based on the particle swarm parameter set to obtain a determination result of diffraction occurrence conditions; calculating the minimum diffraction path based on the diffraction identification result to obtain a set of shortest path lengths; performing wave velocity inversion based on the set of shortest path lengths and the second information to obtain the optimal wave velocity value and the spatial location of the seismic source; and calculating the seismic origin time based on the optimal wave velocity value and the spatial location of the seismic source to obtain seismic origin time data. This invention achieves accurate modeling and path compensation for elastic wave diffraction effects, thereby effectively eliminating propagation path deviations caused by the existence of voids and significantly improving the accuracy and reliability of microseismic source location in deeply buried tunnels.

The application discloses a liquid surface under sonar detection target, which is used for liquid surface under detection of a sonar device. The detection target comprises a target head, a support and a sound shadow tracking mechanism. When the detection target and the sonar device are simultaneously located on a liquid surface, the support is located in a sound shadow area range caused by the sonar wave emitted by the sonar device acting on the target head. When the detection target and the sonar device are simultaneously submerged under the liquid surface and the detection target is deformed, the support is kept in the sound shadow area range caused by the sonar wave emitted by the sonar device acting on the target head by the action of the sound shadow tracking mechanism. The sound shadow area formed by the detection target in the sonar wave range of the sonar device is utilized, the deformation of the support caused by the action force is reduced by the sound shadow tracking mechanism, the influence of the deformation on the test result is reduced, the support can be completely hidden in the sound shadow area, the reflection effect and the diffraction effect of the support are avoided, and the influence on the performance test result of the active sonar is greatly reduced.

An apparatus includes an optical system, a transmitter, and a detector. The optical system includes a transmitter-side component and a detector-side component. The transmitter is adapted to transmit a first plurality of light spots along a transmitter-side optical path passing through at least one transmission region of the transmitter-side component and outside the apparatus. The detector is adapted to detect a second plurality of light spots from outside the apparatus and along a detector-side optical path passing through at least one transmission region of the detector-side component. The transmitter-side component is adapted to apply a first diffraction effect to the first plurality of spots, the first diffraction effect introducing at least one n-order diffraction point, each n-order diffraction point corresponding to one of the first plurality of spots. The detector-side component is adapted to apply a second diffraction effect to the second plurality of spots prior to detection by the detector.

The invention relates to the technical field of photoetching, in particular to an optical waveguide master mask defect self-adaptive photoetching method based on Talbot self-imaging, which comprises the following steps of: calculating a Talbot self-imaging distance by collecting a design period and an exposure wavelength parameter of an optical waveguide master mask, and driving a substrate coated with photoresist to be accurately positioned to the distance; after positioning is completed, coherent light output is started, meanwhile, the substrate is controlled to perform in-plane periodic motion, distortion components caused by defects are optically counteracted by a diffraction light field in the propagation process through the Fresnel diffraction effect, and homogenized light intensity distribution is generated; and after the distribution is recorded by the photoresist, a grating structure is formed through development, and the optical waveguide template is prepared through etching and deposition processes. Defect suppression can be realized on the optical level, the structural integrity and preparation consistency of the template are improved, the scrap demand of the mother set is reduced, and the production cost is reduced.

A method for determining a refractive index profile of an optical object having a cylindrical surface includes: (a) scanning the surface at a first plurality of scanning locations with a pinhole aperture in a path of one or more optical beams; (b) measuring a first deflection function based detecting the optical beams after deflection by the optical object for each of the first plurality of scanning locations; (c) scanning the surface at a second plurality of scanning locations where the path of the optical beams is free of the pinhole aperture; (d) measuring a second deflection function based on detecting the optical beams after deflection by the optical object for each of the second plurality of scanning locations; (e) merging at least portions of the first and second deflection functions to obtain a composite deflection function; and (f) calculating the refractive index profile using the composite deflection function.

To provide a technique capable of reducing the influence of the variation in the thickness of a resin cured material layer having projecting parts for dividing light by developing a diffraction action on the branched light intensity ratio of a diffraction optical element.SOLUTION: The diffractive optical element 10 includes a substrate 11 that transmits a laser beam having a wavelength in a near-infrared region, and a cured resin layer 12 that is provided on the substrate 11 and transmits the laser beam, wherein the cured resin layer 12 has a refractive index of 1.5 or more and 1.6 or less at a wavelength of 9400 nm, and a plurality of convex portions 12P that generate a diffractive action are formed on a surface of the diffractive optical element 10, and each of the plurality of convex portions 12P has a height in a range of 0.5 μm or more and 1.5 μm or less. The width is in a range of 0.3 μm or more and 2.0 μm or less.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of optical filters, and discloses an optical feedback type tunable Fabry-Perot filter, which comprises a supporting structure formed by connecting a fixed lens cone and a load lens cone through a mortise and tenon joint structure; the resonant cavity assembly comprises a first reflecting mirror and a second reflecting mirror which are parallel to each other; the tuning driving module comprises piezoelectric ceramics, and the cavity length of the resonant cavity assembly is regulated and controlled by applying voltage to the piezoelectric ceramics; and the optical feedback module is used for calculating the cavity length and the cavity length deviation according to a diffraction pattern generated by the detection light in a diffraction gap between the first reflector and the second reflector so as to adjust the driving voltage of the piezoelectric ceramic. By introducing an optical feedback mechanism based on the diffraction effect, the cavity length change is monitored and compensated in real time, the problem of output peak drift caused by piezoelectric ceramic creep and hysteresis is solved, and meanwhile, the small-size characteristic and high stability are kept.

The application discloses an atmospheric disturbance analysis method and system based on Bohm mechanics and waveguide geometric optics, and relates to the technical field of optical simulation and emulation.The application effectively solves the fundamental contradiction that traditional geometric optics cannot describe diffraction effect and wave optics lacks path traceability.By introducing the Bohm mechanics thought, the phase gradient of the light field is taken as a physical quantity for driving the evolution of the light rays, while the ability of the traditional ray tracing intuitive path analysis is reserved, and the wave effects such as interference and diffraction are naturally included, so that the simulation precision comparable to the wave optics is realized in the key scenes such as beam expansion and focusing limit, and a unified simulation tool which can perform physical mechanism backtracking and ensure numerical accuracy is provided for the precise optical design, micro-nano photonic device analysis and complex medium light transmission research, and the reliability, explanation and engineering practical value of the light field simulation are significantly improved.

The invention relates to a display panel, the size of a first frame area of the display panel in a first direction is larger than that of a second frame area in the first direction, when the display panel is in a curled state, the first frame area and the second frame area can be overlapped with at least part of a display area, the area of the overlapped area is increased, and the display effect is improved. The optical transmittance of the display panel in a curled state can be adjusted, and the optical uniformity of the display panel can be improved. Due to the fact that the width of the first frame area is increased, the distance between every two adjacent first wires can be set to be larger than the line width of the first wires, the light-proof areas of the first wires cannot be perceived by naked eyes through the diffraction effect of light, and therefore the effect that the display panel in the curled state is free of a visual frame is achieved; the display effect of the display panel can be ensured. The invention further provides a display device comprising the display panel.

This invention discloses a spectral measurement method based on the diffraction effect of a width-gradient wedge aperture, comprising: acquiring a spectral diffraction pattern to be measured using a spectral detection device; wherein, the spectral detection device includes a light source, a diffraction screen, and a detector; the light source is disposed on one side of the diffraction screen, and the detector is disposed on the other side of the diffraction screen; the diffraction screen includes a width-gradient wedge aperture; after the light source emits broadband light to be measured and illuminates the width-gradient wedge aperture, the detector acquires the spectral diffraction pattern; and the spectral measurement of the spectral diffraction pattern to be measured is performed using the broadband measurement matrix, which can improve the accuracy of spectral reconstruction.

The application discloses a kind of based on angular spectrum engineering's no diffraction holographic reconstruction method and system, the method solves the technical problem that image quality declines and axial stability is poor in the diffraction effect caused in traditional holographic reconstruction;Technical scheme includes projecting target pattern to phase modulator, using phase modulator to introduce random phase distribution to target pattern, form modulated light field;Modulated light field is Fourier transformed in central Fourier plane by 4f annular filtering module, annular band-pass mask is set in Fourier plane, so that the spatial frequency component located in the preset annular angular spectrum region is transmitted, and the limited angular spectrum light field is obtained;Limited angular spectrum light field is relayed and imaged to the imaging plane of detection equipment by imaging lens group, and target image is formed;The axial stability range can be configured by adjusting the ring width of annular band-pass mask region;The application can realize high-quality no diffraction holographic reconstruction, and has important application value in optical display, three-dimensional imaging and other fields.

The application relates to the technical field of laser communication, and discloses an arbitrary wavelength tracking device and method for laser communication. The device receives a space light signal by using a transceiving assembly, and divides part of the space light signal into a tracking light beam. The device diffracts the tracking light beam by using a tracking assembly to generate light spots of different wavelength light signals. According to position information corresponding to the different wavelength light signals, the wavelength information of the light signals contained in the space light signal is identified. The device and method provided by the application realize the diffraction of the light spots of different wavelength light signals at different positions based on the diffraction effect, so that the corresponding wavelength information is obtained, the tracking of the arbitrary wavelength space light signal is realized, and the device and method do not have the problem of missing tracking wavelengths, and are suitable for the inter-satellite networking scene.

The invention discloses a lens coupling X-ray imaging detector based on a photonic crystal enhanced scintillator. The lens coupling X-ray imaging detector comprises a scintillation wafer assembly, an objective lens, an imaging lens and an image sensor, the scintillation wafer assembly comprises a scintillation wafer substrate and a photonic crystal layer located on a light-emitting surface of the scintillation wafer substrate, the photonic crystal layer is a regularly-arranged medium ball array, the medium ball array can provide reciprocal lattice vector compensation for a waveguide mode in the scintillation wafer substrate through a diffraction effect, the waveguide mode is coupled into a radiation mode, and the radiation mode is used for emitting light to the scintillation wafer substrate. Total internal reflection is destroyed; the objective lens is arranged on one side of the light emitting surface and is used for collecting the signal light enhanced by the photonic crystal layer; the imaging lens is used for receiving and focusing the signal light; the image sensor is arranged at the focal plane of the imaging lens and used for converting the signal light into an electric signal. According to the invention, not only is the light collection efficiency improved, but also the emergent light distribution is improved, the comprehensive imaging performance of low dosage, high sensitivity and high resolution is realized, and compared with the prior art, the system has remarkable advantages.

The invention discloses a reciprocity angle selection device based on symmetrical gratings, which realizes an efficient and accurate angle selection function in a broadband range by utilizing an array of a micron-sized highly-symmetrical geometric structure and based on a luminous flux conservation principle. The device is composed of a substrate, a microstructure array layer and a functional modification layer. The microstructure array layer is formed by periodically and densely paving a plurality of hollow microstructure units in geometric symmetry, the interior of each unit is a funnel-shaped or conical light transmission channel with a large upper part and a small lower part, and a functional modification layer is attached to the side wall of each unit. According to the invention, only light in a specific acceptance angle range is allowed to pass through by regulating and controlling the geometrical parameters of the side wall of the microstructure and utilizing the limiting effect of geometrical optics, so that transmission response with a sharp cut-off characteristic is realized. According to the present invention, the defects of narrow bandwidth, polarization sensitivity, high processing difficulty and the like of the traditional device are overcome, the frequency insensitivity, the polarization insensitivity, good optical path reciprocity and the like are provided, the diffraction effect can be inhibited through the irregular arrangement, and the device is suitable for the high signal-to-noise ratio optical communication system.

The invention discloses a parameter-adaptive femtosecond laser pulse compression module and method in the technical field of ultrafast laser and optical devices. The module comprises a first grating and a second grating, the multi-axis linkage executing mechanism is used for driving the first grating and the second grating to synchronously rotate and driving the second grating to translate; and the second reflection element is used for reversely transmitting the light beams diffracted by the first grating and the second grating, and the light beams are reflected and output by the first reflection element after passing through the second grating and the first grating again. The double gratings are matched with the reflection element to increase the dispersion compensation amount, the multi-axis linkage executing mechanism drives the two gratings to synchronously rotate so as to adjust the incident angle, the second grating is independently driven to calibrate the light beam projection position, displacement compensation is automatically carried out while the incident angle is adjusted, manpower is saved, and the diffraction effect is improved.

The application relates to the technical field of acoustic monitoring and positioning, and discloses a low-wind-noise integrated acoustic monitoring device and a multi-target positioning method, which comprises a vertical axisymmetric body, the outer surface of the axisymmetric body is a smooth convex curved surface, the diameter of the middle section is larger than the diameters of the upper end section and the lower end section in the vertical direction, and the ratio of the height of the axisymmetric body to the maximum section diameter, that is, the length-diameter ratio, is 2:1-6:1; the axisymmetric body comprises an upper contraction section, a smooth joint surface and a lower contraction section; and an air sound receiver array is installed on the upper contraction section of the axisymmetric body. The application breaks through the technical prejudice that a sound receiver array should avoid curved surface diffraction, converts the diffraction effect caused by a large-curvature streamline curved surface from an acoustic defect into an equivalent aperture gain through a pre-stored scattering response model, guarantees the aerodynamic noise reduction performance, realizes deep closed-loop cooperation of the shape and the algorithm, and provides a brand-new technical path for the design of the same type of device.

This application discloses an optical waveguide structure, an optical module, and smart glasses. The optical waveguide structure includes a substrate and a grating disposed on the substrate. The grating includes a first structural layer and a second structural layer. The first structural layer forms multiple mounting spaces, and the second structural layer includes multiple structural components, with each structural component correspondingly mounted within a mounting space. The first and second structural layers are arranged in a volume ratio to form a grating with a preset refractive index. This optical waveguide structure has the advantages of increasing the controllability of the diffraction effect of the optical waveguide structure and reducing grating scattering.

The application discloses a kind of full-optical time-domain pulse width measuring device and method based on perturbation self-diffraction effect, existing frequency domain measurement technique is difficult in the technical problem of measuring periodicity order pulse, specifically including beam splitter, delay unit, beam combiner, light splitter, first focusing mirror, nonlinear grating, filter plate and spectrometer;Beam splitter is used to divide the light to be measured into reflected light and transmitted light;Delay unit is arranged on the light path where the transmitted light is, for delaying the transmitted light;Beam combiner is used to combine the reflected light and the transmitted light after the action of delay unit, to form combined light;Light splitter, first focusing mirror, nonlinear grating, filter plate and spectrometer are sequentially arranged on the light path where the combined light is along the emission direction;Nonlinear grating is used to make focused light beam produce self-diffraction signal;Filter plate is used to extract first-order self-diffraction signal from self-diffraction signal to spectrometer, so that the spectrometer obtains corresponding self-diffraction spectrum intensity data.

The application provides a design method of a diffractive optical element for improving zero-order diffraction effect. Step S1: obtaining an initial diffractive optical element, using a scalar diffraction algorithm to obtain a phase distribution of the initial diffractive optical element to obtain an initial phase distribution; step S2: performing point array processing on the initial phase distribution to form a point array region, thereby forming a new diffractive optical element; step S3: calculating a processing depth according to a phase difference of the initial phase distribution; step S4: performing vector scanning on the processing depth of the initial diffractive optical element to obtain zero-order diffraction efficiency at different depths, and performing vector scanning on the processing depth of the new diffractive optical element to obtain zero-order diffraction efficiency at different depths; and step S5: comparing and analyzing the zero-order diffraction efficiency at different depths of the initial diffractive optical element and the new diffractive optical element. The application solves the problem of the influence of zero-order diffraction effect on imaging quality in the prior art.