900 results about "Incident beam" patented technology

Meta-optic systems are described that include multi-function metasurfaces formed from a plurality of meta-atoms. A multi-function metasurface can exhibit two or more different optical functions for two or more different states of light incident on the metasurface. Different states of light include different polarizations, different wavelengths, and different angles of incidence. Different optical functions include distance sensing, converging, diverging, image formation, and patterned light formation. The multi-function metasurface can selectively impart different phase profiles to an incident beam depending on the incident beam's state of light.

Described herein are methods and systems for measuring polarization states of nonlinearly generated light by a sample illuminated in response to receiving an incident beam having a known polarization state to determine a characteristic of the sample. The system includes an optical ellipsometer configured to be included in-line of a semiconductor fabrication line and generate measured signals proportional to different polarization parameters of second-harmonic light nonlinearly generated light by the sample, allowing determination of a complete polarization state of the second harmonic light using a characteristic of the sample is determined.

The invention provides a metasurface structure and method for realizing transverse polarization focusing light splitting, and the metasurface structure comprises a substrate and a surface structure which is disposed on the substrate. The surface structure is composed of a plurality of sub-wavelength structure units which are arranged in a concentric circular ring mode. The sub-wavelength structure unit performs polarization-independent focusing of an incident beam through transmission phase regulation and control, and performs polarization-dependent light splitting of the incident beam through geometric phase regulation and control. The point diffraction plate can realize light beam splitting and focusing functions related to polarization, has the advantages of being simple in structure and high in integration level, solves the technical problems that an existing point diffraction plate does not support synchronous phase-shifting interference measurement and the contrast ratio of interference fringes is low, and enables the contrast ratio of the interference fringes of point diffraction interference measurement to be higher, the resolving precision to be higher and the resolving speed to be higher.

The invention discloses a laser channel atmospheric turbulence fading real-time compensation device and method based on a galvanometer system, and the method comprises the steps: enabling an incident light beam to irradiate a transparent PCB integrated with a photodiode array after the incident light beam is focused through a convex lens, obtaining the light intensity distribution of a current light spot through the photodiode array, and transmitting the light intensity distribution to a signal processing unit; the signal processing unit coarsely adjusts the deviation direction of the light spots according to the received light intensity distribution data, and aligns the part with the strongest light intensity in the light spots to the end face of the optical fiber; and based on the roughly adjusted light spot deviation direction, the signal processing unit dynamically adjusts the deflection angle of the galvanometer by using a gradient descent method according to the power measurement value of the receiving coupling module, so that the fine adjustment of the light spot deviation direction is realized, and the receiving coupling power is maximized. The objective of receiving optical power maximization is achieved, optical design, electronic control and algorithm optimization are combined, and atmospheric turbulence compensation with high cost performance is achieved.

The invention discloses a method for dynamically correcting off-axis aberration of a liquid mirror telescope, which comprises the following steps of: S1, adjusting a secondary mirror body to perform dynamic full-angle circular motion around the center of a primary mirror by using a secondary mirror rotating system, so that the secondary mirror body acquires an incident beam from any direction; s2, acquiring attitude information of the secondary mirror body, and adjusting the secondary mirror body according to the dynamically changeable off-axis angle based on a preset secondary mirror pose adjustment sub-method to compensate for low-order aberration; s3, the light beams of the distorted wavefront compensated by the secondary mirror are adjusted to be emitted in a determined direction in parallel and enter an adjustable beam expanding and shrinking mirror through two groups of plane reflection systems; s4, the light beam with the light spot size adjusted through the adjustable beam expanding and shrinking mirror is reflected to the magnetic liquid deformable mirror through the reflecting mirror; and S5, the magnetic liquid deformable mirror receives the reflected light beam and performs residual aberration correction. According to the method, the observation view field of the liquid mirror telescope can be effectively improved, the imaging quality is improved, and an aberration correction system is endowed with excellent flexibility and wide adaptability.

An apparatus includes a fiber-optic connector configured to be connected between one or more optical fibers having fiber cores and a photonic integrated circuit (PIC) including vertical-coupling elements. The fiber-optic connector includes a polarization beam splitter and a patterned birefringent plate. The polarization beam splitter splits an incident light beam from a fiber core into first and second beams having first and second polarizations, respectively. The patterned birefringent plate includes a first region (having a first optical birefringence) and a second region (having a second optical birefringence). The difference in the first and second optical birefringence is caused by (i) applying localized heating to the first region without applying localized heating to the second region to cause the first region to have a lower birefringence as compared to the second region, or (ii) applying different amounts of localized heating to the first and second regions to produce different birefringence.

A high-power narrow-pulse-width dual-wavelength laser based on LED pumping comprises a Porro prism, at least two groups of LED pumping modules, a passive Q-switch and an output mirror which are sequentially connected in series. And the Porro prism is used for adjusting and coupling an optical path so as to ensure that an incident light beam enters the system at a proper angle and direction. The main function of the LED array as a pumping source in the laser is to provide excitation energy and excite electrons in the gain medium to transition from a low energy state to a high energy state so as to generate stimulated radiation. When light emitted by the LED irradiates the gain medium, the medium absorbs light energy and enters an excited state, and then laser output is achieved in the resonant cavity through stimulated emission. The inner cavity seed light injection technology combines the advantages of high flexibility, high stability and easy regulation and control, greatly enhances the performance and application range of the dual-wavelength laser, and is particularly prominent in the fields of precision optical application, nonlinear optics and the like.

The invention discloses a film strength detection method and related equipment, and the method comprises the steps: carrying out the multi-angle broadband scanning sampling of the whole process of an incident light beam penetrating through a lens, recording the transmission light intensity, group phase and scattering power, and generating a reference transmission spectrum matrix; applying low-amplitude periodic ultrasonic vibration disturbance to the lens according to the reference matrix, synchronously obtaining a transmission spectrum time change curve, and performing time domain analysis to obtain a stress response characteristic matrix; determining a detection path by integrating the two matrixes, performing incremental load scratch disturbance along the path, recording data of transmission light intensity and scattering power changing along with the load in real time, and forming a critical damage response data set; performing fine grid transmission light scanning on the scratch and the neighborhood, acquiring multi-angle scattering distribution, and constructing optical characteristic distribution data; and performing multi-dimensional analysis on the data, and outputting a result. According to the scheme, early-stage accurate identification and evaluation of microcracks in a lens film layer and interface hidden defects are realized, and the use reliability of the lens is improved.

The invention relates to a diffractive optical element beam shaping method based on spatial frequency filtering, and the method comprises the steps: obtaining an incident beam, and obtaining corresponding geometric analysis phase distribution based on a preset homogenized beam; the homogenized light beam is adjusted to be a rectangular flat-topped light beam, and phase correction processing is carried out on the obtained geometric analysis phase; the geometric analysis phase after phase correction is processed based on a spatial frequency filtering method, a processed light field regulation and control distribution requirement is obtained, and the processed light field regulation and control distribution requirement has phase and amplitude regulation and control requirements at the same time; and designing a diffractive optical element, so that the diffractive optical element meets the required light field regulation and distribution requirements, and shaping an incident light beam into the rectangular flat-topped light beam by using the diffractive optical element. According to the invention, the light beam homogenization effect with high uniformity, sharp edge and high diffraction efficiency can be realized, and wide application prospects are obtained in the aspects of laser welding, photoetching, biomedicine and the like.

The invention discloses a microwave wireless energy transmission wave beam high-precision pointing and tracking method and system, and the system comprises an interferometer angle measurement module, an energy center self-adaptive detection module and a distance measurement and communication integrated feedback link module, and the interferometer angle measurement module provides an initial pointing angle for energy wave beam alignment. The charging satellite controls the transmitting antenna to transmit energy beams according to the angle measurement result of the interferometer. After a wave beam reaches a receiving antenna array surface, a receiving antenna measures power through a plurality of power monitoring points, then the actual position of an energy center is inverted through an adaptive measurement algorithm, the azimuth angle and the center offset distance of an incident wave beam under a receiving antenna coordinate system are obtained, and the pitch angle of an incident wave beam is estimated by combining distance measurement information. And the energy receiving satellite feeds back estimated values of the pitch angle and the azimuth angle to the transmitting antenna through the distance measurement and communication integrated feedback link to correct a beam pointing error, so that high-precision beam pointing control of the microwave energy transfer system is realized.

A metalens used for beam shaping, beam-shaping system and the generating method of the metalens are provided by the present application. The metalens is used to shape an incident beam, and a divergence angle at least in one direction of an outgoing beam obtained by shaping is greater than the divergence angle in the same direction of the incident beam.

The invention is suitable for the technical field of optical measurement, and provides a back drill stub length detection method, a signal processing assembly and a system. The method for detecting the length of the back drill stump comprises the steps that the optical path difference between first reflected light and second reflected light is obtained, the first reflected light is reflected light generated by reflecting an incident light beam of a back drill hole to be detected on the surface of a dielectric layer of the back drill hole to be detected, and the second reflected light is reflected light generated by reflecting the incident light beam of the back drill hole to be detected; the second reflected light is reflected light obtained by reflecting a light beam, passing through the dielectric layer, of the incident light beam by the signal layer of the back drilling hole to be detected; and according to the optical path difference and the refractive index of the dielectric layer, determining the stub length of the back drilling hole to be measured. According to the embodiment of the invention, the same incident light beam can be reflected by different layers of the back drilling hole to be detected, the stub length is determined based on the optical path difference between the two reflected light beams, and the detection efficiency is improved.

An optical detection device, comprising an objective lens, a bright field illumination unit and a dark field illumination unit. The objective lens is provided with a bright field light channel and a dark field light channel. The bright field illumination unit comprises a bright field beam splitting unit and a bright field light source for providing a bright field incident light beam, wherein the bright field incident light beam is reflected by the bright field beam splitting unit and then enters the bright field light channel. The dark field illumination unit comprises a dark field light source for emitting a dark field incident light beam, a prism module and a dark field beam splitting unit; the prism module and the dark field beam splitting unit are sequentially arranged in the transmission direction of the dark field incident light beam; the prism module is used for converting the dark field incident light beam into a circular light beam, wherein the circular light beam is reflected by the dark field beam splitting unit and then enters the dark field light channel; and the dark field beam splitting unit comprises a circular beam splitter and an aperture formed at the center of the circular beam splitter, wherein the aperture is located on the transmission path of the bright field incident light beam. The present invention more conveniently realizes switching between bright field detection and dark field detection, thereby improving the detection efficiency.

The invention discloses a defect detection method and system, a storage medium and computer equipment, and belongs to the technical field of wafer graph-free defect detection, and the method comprises the steps: obtaining first parameter information of an incident light beam and second parameter information of a wafer to be detected, the first parameter information comprises the incident light wavelength, the incident light intensity and the incident light polarization direction, and the second parameter information comprises the incident light wavelength and the incident light intensity; the second parameter information comprises distribution states of particles of various sizes on the surface of the wafer; a wafer scattered field transmission model is constructed based on the first parameter information and the second parameter information, the wafer scattered field transmission model has the characteristics of multiple channels and multiple modes, the scattered light intensity of particles of different sizes in each channel and each mode can be obtained, and the scattered light intensity distribution result and the polarized light intensity distribution result of the particles of different sizes are determined; selecting a modal combination in a wafer scattered field transmission model according to the size range of the detected particles in combination with the scattered light intensity distribution result and the polarized light intensity distribution result of the particles with various sizes; and determining element parameters required to be selected in the defect detection system based on the modal combination.

The invention provides a non-linear error compensation system and method for a stylus contourgraph sensor, and the system comprises a laser light source, an adjustable diaphragm, a beam splitter prism, a focusing lens and a lever which are sequentially arranged along the transmission direction of a light path. An incident light beam emitted by the laser light source is reflected by the lever to form a reflected light beam; the reflected light beam sequentially passes through the focusing lens and the beam splitter prism and then enters the imaging lens; wherein the lever can deflect in the Z direction; the imaging lens, the narrow-band optical filter and the position sensitive detector are sequentially arranged along the transmission direction of the optical path; the position sensitive detector is used for acquiring the position of the center of the reflection light spot in the Z direction before and after the lever deflects in the Z direction; and the control unit is in signal connection with the position sensitive detector. The position change of the reflected light spot in the Z direction is detected, and the angle change of the lever is calculated, so that nonlinear error measurement and dynamic compensation in the X direction and the Z direction are realized.

The invention discloses a large-view-field high-resolution imaging system based on polarization regulation and control, the large-view-field high-resolution imaging system comprises a metasurface system array and a camera along the direction of a light path, and the metasurface system array comprises a plurality of pairs of metasurface systems which are distributed in an array; each pair of metasurface systems comprises a first metasurface system and a second metasurface system; the first metasurface system is used for performing high-resolution imaging and large-view-field imaging on a first polarization light beam and a second polarization light beam of an incident light beam respectively; the second metasurface system is used for performing large-view-field imaging and high-resolution imaging on the first polarization-state light beam and the second polarization-state light beam respectively; the camera is used for acquiring and fusing images formed by different metasurface systems so as to capture a high-resolution central region of interest and surrounding environment information of a wide field of view. The system can efficiently realize higher imaging quality.

The invention discloses a light beam drift automatic compensation device of a high-power laser processing head, and the implementation process of a light beam detection module comprises the following steps: a laser main light beam is firstly divided into transmission light and two beams of reflection light (detection light) by two reflection surfaces of an optical wedge, and the two beams of detection light are respectively converged on a position photoelectric detector and a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) camera through a focusing lens; through data information fusion of the position photoelectric detector and the CMOS camera, light spot shape information obtained by the CMOS camera can be complementary with the high-precision angle measurement capability of the position photoelectric detector, and the measurement precision of light spots in various shapes is improved while high resolution and high response speed of detection are ensured. Whether the incident light beam deflects relative to the incident direction or not is judged according to the angular offset theta, measured by the light beam detection module, of the light beam, and the transmitted light automatically compensates the deflected light beam through the light beam compensation module, so that the emergent light beam and the incident light beam keep the same optical axis and are emergent perpendicular to the incident plane.

The invention belongs to the technical field of radiation effect and radiation hardening of semiconductor devices and integrated circuits, and particularly relates to a single event effect laser simulation system based on Bessel beam shaping. A Bessel beam shaping and focusing module based on an axon lens is introduced and composed of the axon lens and two lenses, namely a single lens and a focusing lens, a Gaussian beam of an incident beam is shaped into a quasi-Bessel beam, and the quasi-Bessel beam is utilized to irradiate a semiconductor device to be detected. The axial distribution of the light beam is kept unchanged in a range of hundreds of microns, and the focusing breaking through the diffraction limit is realized in the radial distribution, so that the effect closer to the heavy ion charge deposition track is generated. The technology can solve the problem that a multilayer structure device, a thick sensitive region device and a wide forbidden band device are difficult to test through traditional laser simulation, and has important practical value for promoting laser simulation of the single event effect.

An example system includes a first steering layer interposed between an electromagnetic (EM) source and an emission lens. The first steering layer includes a triplet lens having a Plano-convex lens, a Plano-concave lens, and an electro-optical (EO) crystal positioned between the lenses. The EO crystal includes transparent electrodes on each side, coupled to the respective lenslet and / or the EO crystal. The system includes the EM source providing an incident EM beam on the first steering layer, and the emission lens emitting a steered EM beam to a target location.

Examples disclosed herein relate to a reflectarray panel for near-field wireless communication coverage area and designing the reflectarray panel. The method includes one or more following steps, including, determining a near field coverage area of the reflectarray panel, calculating a tangential reflected field on a reflectarray surface of the reflectarray panel based at least on a feed location and initial geometric parameters of the reflectarray surface, determining radiation pattern specifications with an incident beam pointed toward a center of the near field coverage area, performing a near-field pattern synthesis algorithm on an initial phase distribution of the reflectarray panel, determining a synthesized phase distribution on the reflectarray surface from a result of performing the near-field pattern synthesis algorithm, adjusting one or more geometric parameters of each reflectarray cell of the reflectarray panel to produce the synthesized phase distribution, and / or determining dimensions of the reflectarray panel for manufacturing.

The present invention provides a laser optical module, a laser welding head and a laser welding method, and relates to the field of laser welding. The scheme adopted is: including a collimator, and also including: a beam splitter reflector, the structure of the beam splitter reflector is a regular tetrahedron, the bottom surface of the beam splitter reflector is coaxial with the collimator and perpendicular to the optical axis, and the four inclined surfaces of the beam splitter reflector can reflect the incident light beam into parallel light in four directions; a reflective component, the reflective component can reflect the four beams of parallel light reflected by the beam splitter reflector, and the angle θ of the four beams of parallel light after reflection is the same as that of the vertical direction; a focusing mirror, the focusing mirror can focus the four beams of parallel light reflected by the second reflecting component into four light spots, the centers of the four light spots can be centrally symmetrically distributed, and a wire tube through hole is provided at the center of the focusing mirror. The present invention can make the welding wire evenly heated and melted everywhere, and form a molten pool of regular shape, further improving the welding quality.

The invention relates to the technical field of photoacoustic spectrometry, in particular to a gas detection device and method based on a 3D printing Helmholtz photoacoustic cell, and is suitable for the fields with load requirements such as unmanned aerial vehicle-mounted gas monitoring platforms. In order to overcome the problems of large volume, heavy weight, complex structure and low integration level of a photoacoustic gas sensor in the prior art, the lightweight Helmholtz photoacoustic cell structure manufactured based on 3D printing comprises a sound wave generation cavity, a small-diameter connecting pipe and a detection cavity which are integrally formed, an optical reflection unit is integrated in the sound wave generation cavity, and the optical reflection unit is integrated in the detection cavity. Two concave reflectors are arranged to reflect incident light beams for 160 times, a laser, an optical fiber collimator, a pre-amplifier, a lock-in amplification circuit board, a notebook computer and a current temperature control module are arranged outside, and the concentration of gas to be detected is obtained through analysis and processing of the notebook computer.

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.

The invention provides a control method, device and system for a reconfigurable metasurface, and relates to the technical field of reconfigurable metasurfaces, and the method comprises the steps: obtaining an incident wave beam direction and an emergent wave beam direction corresponding to each surface unit; determining a target phase corresponding to each surface unit according to the incident wave beam direction and the emergent wave beam direction; respectively determining a reference surface unit row and a reference surface unit column from the plurality of surface unit rows and the plurality of surface unit columns; determining a plurality of first control signals according to the target phase corresponding to each surface unit of the reference surface unit row, and determining a plurality of second control signals according to the target phase corresponding to each surface unit of the reference surface unit column; and controlling each surface unit to perform phase inversion according to the plurality of first control signals and the plurality of second control signals, so that the number of control channels can be reduced, the use of a digital-to-analog converter and a control chip is reduced, the structure of a control system is simplified, and the cost is reduced.

A beamsplitter can include a first surface with a diffractive optical element, a second surface normal to the first surface, and a beam splitting surface arranged at an angle to the second surface that is less than 45 degrees. The beamsplitter may be configured to illuminate the entire second surface in response to an input beam at the first surface.

The invention provides a time stretching Fourier transform optical frequency comb morphology measurement system and method. The time stretching Fourier transform optical frequency comb morphology measurement system comprises an optical frequency comb OFC, an interferometer module, a dispersion optical fiber module, a signal detection module and a synchronous control module. An optical frequency comb (OFC) provides an incident light beam for the interferometer; the interferometer module obtains an interference signal of the measured object by adjusting the length of the single-mode optical fiber; the dispersion transmission module performs time stretching on the interference signal through a single-mode optical fiber to generate a time domain interference signal; a signal detection module captures the stretched time domain interference signal, and solves the morphology parameters of the measured object through a time-frequency transformation algorithm; the synchronous control module drives the two-dimensional displacement platform bearing the measured object through the motion control card and triggers synchronous acquisition and storage of three-dimensional shape data of the measured object. The method has enough high precision in morphology measurement, and the detection speed of the method can meet the requirements of industrial real-time detection.

A measuring arrangement for non-destructive measurement of an object surface by interferometric measuring methods, wherein light strikes the measuring arrangement as a light beam reflected from the surface, including a diaphragm with an aperture; mirror arrangement with two mirrors having mirror surfaces; a camera lens and camera; wherein the incoming light beam passes the diaphragm and diffracts before hitting the mirror arrangement and splits and deflects into two partial beams, which reach and interfere in the camera; wherein the light beam passes the camera lens in front of the camera in beam direction; and wherein one mirror of the mirror arrangement is rotatable relative to the other; and wherein the camera includes a camera chip with a local sampling frequency and the diaphragm diffracts the incoming light beam as it passes through such that its spatial frequency corresponds at most to the maximum camera chip local sampling frequency during detection.

The invention relates to a multi-wavelength optical secret sharing system and method based on an optical diffraction neural network. The multi-wavelength optical secret sharing system comprises an input layer module, a modulation layer module and an output layer module which are connected in sequence. The input layer module is used for generating incident light beams with different wavelengths; the modulation layer module is used for carrying out phase modulation on an incident light beam and encrypting to-be-transmitted information split into a plurality of target images through optical diffraction calculation, the modulation layer module comprises a plurality of modulation layers, the on-off state of each modulation layer is independently controllable, and the modulation layer is used for carrying out phase modulation on the to-be-transmitted information. The trained modulation layer module can generate a unique corresponding secret key for each target image, and each secret key comprises the wavelength of an incident beam and the on-off state of each modulation layer; and the output layer module is used for reproducing the split information to be transmitted to realize optical secret sharing, the output layer module comprises a plurality of output planes, and each output plane is used for reproducing a corresponding target image according to different key combinations. Compared with the prior art, the security and capacity of information transmission can be further improved.

The invention discloses a space-time light field dynamic reconstruction method based on monochromatic numerical mode decomposition, and belongs to the field of space-time mode-locked pulse fiber lasers and multimode nonlinear fiber optics, and the method comprises the following steps: S1, building an analysis platform which comprises a space-time mode-locked laser, a folded mirror, a spectral filter, a processing device and an acquisition device, the processing device adjusts the state of the spectral filter, and the acquisition device points to the folding mirror; s2, calibrating the analysis platform; s3, the space-time mode-locked laser generates an incident beam, after spectral filtering, the acquisition device continuously acquires spatial light intensity corresponding to each spectral component, and spectrum-spatial intensity information is obtained; and S4, converting the spectrum-space intensity information into space-time structure information. By adopting the method, the output mode of the space-time mode-locked pulse is monitored in real time, the mode selective excitation in the space-time mode-locked laser cavity is fed back and controlled, and a solution is provided for a high-performance space-time mode-locked fiber laser with a controllable output mode.

Optical imaging or spectroscopy described can use laminar optical tomography (LOT), diffuse correlation spectroscopy (DCS), or the like. An incident beam is scanned across a target. An orthogonal or oblique optical response can be obtained, such as concurrently at different distances from the incident beam. The optical response from multiple incident wavelengths can be concurrently obtained by dispersing the response wavelengths in a direction orthogonal to the response distances from the incident beam. Temporal correlation can be measured, from which flow and other parameters can be computed. An optical conduit can enable endoscopic or laparoscopic imaging or spectroscopy of internal target locations. An articulating arm can communicate the light for performing the LOT, DCS, or the like. The imaging can find use for skin cancer diagnosis, such as distinguishing lentigo maligna (LM) from lentigo maligna melanoma (LMM).