481 results about "Wavefront" patented technology

The invention discloses a shock wave overpressure field global measurement method based on multi-view image fusion, belongs to the technical field of explosive shock wave measurement, and is suitable for weapon equipment power evaluation and blasting safety analysis. The method comprises the following steps of: synchronously acquiring a time sequence image of the whole explosion process through a distributed multi-view high-speed imaging system, preprocessing the image by adopting pixel-by-pixel comparison, square operation enhancement and normalization processing, and positioning a shock wave edge contour; the blasting center coordinate is positioned through binocular parallax, the shock wave initial radius is determined by combining spatial domain analysis, and the key feature points of the front and rear edges of the wavefront are detected by using a dynamic search window and a radial gradient field. Based on multi-view constraints, a three-dimensional point cloud is generated through direct linear triangulation, and a three-dimensional wave front form is reconstructed in combination with least square spherical fitting. And finally, constructing a wavefront radius-time evolution model, and deducing a quantitative relationship between the instantaneous propagation velocity and the peak overpressure in combination with a Ranki ne-Huton iot relationship, thereby realizing the global high-precision calculation of the overpressure field.

The invention discloses a molded case circuit breaker short-circuit fault positioning method, and the method comprises the steps: obtaining the current differential response data of all branches of a molded case circuit breaker control loop when a short-circuit fault occurs based on a magnetoresistive sensor, obtaining a first data set, analyzing the first data set, and extracting the wavefront features of each branch; wavefront arrival time is obtained based on wavefront features, the first data set is input into a wave velocity calibration model to obtain frequency-dependent wave velocities of all branches, and the wavefront arrival time and the frequency-dependent wave velocities are input into a short-circuit fault positioning model to obtain space coordinates of fault points; and carrying out confidence evaluation on the fault point space coordinates to obtain an evaluation result, and judging whether to send the fault point space coordinates to a terminal user based on the evaluation result. The current differential response data is obtained based on the magnetoresistive sensor, the wavefront features are extracted, the frequency-varying wave velocity calibration and path compensation optimization model is combined, the problems of insufficient signal capture, wave velocity modeling deviation and low time difference detection precision in a traditional method are solved, and the short-circuit fault positioning method has the advantage of improving the short-circuit fault positioning precision and reliability.

The invention discloses a primary and secondary mirror combined detection system and method for a beam shrinking system, and belongs to the technical field of optical detection.The method comprises the steps that a first micro-spherical mirror and a second micro-spherical mirror are arranged, reflection light spots are captured through an interferometer, the position offset is calculated, and a first control instruction for adjusting the pose of a secondary mirror is generated; a dual-band light source is integrated in a detection light path, wavefront data and alignment monitoring data are collected, and temperature drift is corrected to obtain effective combined wavefront; an error separation model is constructed based on the primary mirror compensator parameter and the Zernike aberration coefficient, and a primary mirror surface shape error component and a secondary mirror offset error component are decoupled and separated by using a preset aberration coupling coefficient; feeding the error component back to a polishing process and a displacement table for closed-loop iterative correction until the RMS value and the PV value of the effective combined wavefront meet a preset imaging quality index; through precise positioning, error correction and decoupling separation, the precision and efficiency of primary and secondary mirror combination detection are improved, and targeted correction is realized.

The invention relates to a coherent free space optical communication system based on an RBMGC optimization algorithm, belongs to the technical field of optical communication, and solves the problem of poor high-order aberration correction effect caused by insufficient high-order phase aberration correction capability of an existing SLAO system optimization algorithm under a complex atmospheric turbulence condition. The SLAO system comprises a high-speed camera, a wavefront controller and a wavefront corrector, an RBMGC optimization algorithm is operated in the wavefront controller to generate an optimal voltage control signal of the wavefront corrector, and the RBMGC optimization algorithm adopts a self-adaptive step length updating mode established based on a gradient correction mechanism to update the position in an exploration stage and a development stage. Therefore, the search process is optimized. The RBMGC optimization algorithm has better convergence rate, correction precision and robustness when correcting the high-order aberration under the complex turbulence condition, the correction effect of the SLAO system on the high-order aberration is improved, and the communication performance of the CFSOC system is improved.

The invention relates to a hundred-milliwatt high-power high-repetition-frequency terahertz strong source generating device at room temperature, belongs to the technical field of nonlinear optical frequency conversion, and solves the problems that the terahertz conversion rate is low and additional cooling equipment is needed in the prior art. The beam expanding lens group is used for carrying out light spot beam expanding on the femtosecond pumping laser until the diameter of a light spot is twice of the original diameter; the plane mirror group is used for guiding the pump laser after beam expansion; the first half-wave plate, the reflective diffraction grating, the gold reflector and the third ultrafast reflector are used for adjusting polarization and diffraction reflection; the 4-f telescope imaging lens group is used for reducing the spot diameter of the received pump laser and imaging the pump laser to the lithium niobate crystal; the lithium niobate crystal generates terahertz pulse radiation in the direction perpendicular to the wavefront; the terahertz collection module receives and focuses the terahertz pulse radiation; and the measuring device is used for receiving the focused terahertz pulse radiation for measurement.

An example method for improving a metasurface design may include providing a first wavefront; providing a library of metasurface elements, wherein each metasurface element has a variable phase response; creating a metasurface design by selecting metasurface elements via the library based on the first wavefront; simulating an electromagnetic response of the metasurface design; measuring a second wavefront based on the metasurface design; calculating an error between the first wavefront and the second wavefront; and generating a new phase profile by subtracting the error from the first wavefront and the second wavefront. Various other methods, systems, and computer-readable media are also disclosed.

The invention relates to a self-adaptive optical matrix calculation acceleration method based on an ARM framework, and belongs to the field of self-adaptive optical wavefront correction technology and embedded parallel calculation. The method comprises the following steps: analyzing a mathematical mapping relationship between a microlens array and wavefront phase distribution in a Hartmann sensor image, and constructing a wavefront matrix operation model based on an ARM multi-core architecture; designing a Hartmann image data rearrangement strategy, dividing a single-frame Hartmann image into multiple task calculation units, and realizing parallelization processing of wavefront slope calculation; a wavefront matrix operation kernel is optimized according to ARM NEON instruction set characteristics, and vectorization calculation of multi-channel wavefront reconstruction is realized by adopting an SIMD parallelization technology; and computing resource allocation is coordinated through a dynamic thread scheduling algorithm, and the task allocation proportion among multiple cores is adjusted according to the real-time load condition. According to the method, the wavefront calculation efficiency is remarkably improved, so that the overall bandwidth of the adaptive optical system is greatly improved.

The invention belongs to the field of solid lasers, and particularly relates to a laser for realizing high-power pump beam quality enhancement based on multi-stack heat transfer, which comprises a pump module, a pump shaping coupling module, a multi-stack crystal, a cube-corner prism, an output mirror and a cooling device. And the multi-laminated crystal adopts a high-thermal-conductivity diamond film, so that transverse rapid diffusion of heat is realized, local heat accumulation and temperature rise are relieved, wavefront distortion and a thermal lens effect caused by thermally induced refractive index change are reduced, and the stability of a laser mode is improved. The cube-corner prism is used as a resonant cavity mirror surface, can automatically compensate angle deviation, optimizes mode matching in the cavity, has a synergistic effect with a zigzag total internal reflection path in the crystal, further balances a heat affected zone, improves light field distribution, and remarkably improves light beam uniformity, stability and TEM00 mode quality. The structure is high in adaptability, is suitable for various wavelengths, pumping modes and thermal loads, and assists the laser to realize miniaturized, high-integration and high-performance output.

The invention provides a three-dimensional holographic imaging method. The method comprises the following steps: loading a holographic pattern to be imaged to a spatial light modulator; modulating a preset laser source by using a spatial light modulator loaded with a holographic pattern to form a first wavefront with initial phase information; carrying out primary scattering on the first wavefront by adopting a first turbid medium lens to form a second wavefront; compensating the second wavefront by adopting a metasurface compensation unit to form a third wavefront; after a second turbid medium lens is adopted to carry out secondary scattering on the third wavefront, a holographic imaging system is utilized to carry out imaging; wherein the metasurface compensation unit is determined according to a transmission matrix of the first turbid medium lens and a transmission matrix of the second turbid medium lens. The imaging view angle can be effectively increased, and the space bandwidth product can be improved.

The invention provides a torsion metasurface frequency reconfigurable holographic method and device based on dispersion regulation and control, and belongs to the field of optical imaging. The problem that an existing mechanical rotary cascade metasurface mainly works at a single fixed frequency and lacks a cross-spectrum function switching capability is solved. The method comprises the following steps: constructing a cascaded double-layer metasurface system which comprises a radiation type metasurface and a pure phase metasurface; the relative torsion angle between the pure phase metasurface and the radiation type metasurface is changed by rotating the pure phase metasurface in a plane, so that the phase distribution of the pure phase metasurface interacts with the output wavefront of the radiation type metasurface; according to the dispersion characteristics of the target holographic image in the three-dimensional space position and frequency, the phase distribution of the radiation type metasurface and the pure phase metasurface is collaboratively optimized through a reverse design frame, and the dynamic switching of the holograms is realized. The method is mainly used in the fields of near-field calculation imaging / detection, high-speed large-data-capacity near-field wireless communication and the like.

The invention relates to a high-resolution wavefront measurement method and device for a complex light field, electronic equipment and a storage medium, and the method comprises the steps: obtaining an observation image representing the to-be-measured wavefront intensity distribution based on to-be-measured light waves passing through a scattering sheet; obtaining initial complex amplitude space distribution corresponding to the wavefront to be measured based on the observation image; and inputting the initial complex amplitude space distribution and the observation image into a target function, taking the complex amplitude space distribution under the condition that the numerical value of the target function is minimum as the complex amplitude space distribution corresponding to the wavefront to be measured, and performing wavefront inversion by minimizing the target function to obtain the wavefront to be measured. The objective function comprises a data fidelity term, a spatial smoothness constraint term and a spatial spectrum bandwidth constraint term of the wavefront to be measured. And for a complex light field with strong aberration, turbulent flow or high-order singular points, the high-resolution wavefront is quickly reconstructed. Object information recording and imaging can be supported under the defocus condition, and the method is further suitable for application requirements of rapid and high-throughput detection and the like.

The invention provides an ultra-wide-band low-RCS metasurface based on polarization conversion units. The ultra-wide-band low-RCS metasurface is formed by rotating the polarization conversion units at different positions by a specific angle and arranging the polarization conversion units. According to the invention, the polarization conversion rate under the broadband is mainly improved, and the RCS is reduced; according to the scheme, the wavefront phase of the incident electromagnetic wave can be changed, so that the reflected electromagnetic wave carries the vortex phase; by utilizing the characteristic of the phase singular point of the vortex wave, the amplitude of the electric field at the center of the reflected wave is zero, and the metasurface shows obvious RCS reduction along the propagation axis. In addition, based on the broadband design of the polarization conversion unit, RCS reduction in an ultra-wideband range is finally realized.

The invention discloses a large dynamic range Hartmann sensor out-of-focus measurement method and device, and belongs to the technical field of wavefront detection, and the method calculates the out-of-focus amount by measuring the change of the distance from a sub-light spot to the center of a light spot array, thereby achieving the out-of-focus measurement of an ultra-large dynamic range. According to the method, under the condition that the defocusing amount is too large and the sub-light spots cross the sub-apertures, the defocusing amount is estimated by measuring the distance variation of the sub-light spots to the center of the light spot array. According to the method, the defocusing amount is calculated by analyzing the position change of the sub light spots and calculating the distance difference between the sub light spots and the center of the target surface, so that the limitation of the traditional Hartmann measurement method on the dynamic range is overcome. According to the method, the light spot distance is used as a measurement basis, and the out-of-focus range capable of being detected by the Hartmann sensor is remarkably expanded. The estimation mode based on the light spot distance is suitable for the situation that sub-light spots cross sub-apertures, and an efficient and reliable defocus measurement scheme is provided for a large optical system.

The present disclosure relates to a computer-implemented method for determining a refractive correction in an optical system, such as an eye. This method involves the utilization of data representing a light wavefront that has passed through the optical system to compute a curvature map. The curvature map is then segmented into at least two clusters based on the variation between the curvature data points. For each cluster, the mean curvature of the light wavefront is calculated. Subsequently, the refractive correction corresponding to the mean curvature of the light wavefront in each cluster is computed. The final step involves selecting one of these computed refractive corrections as the definitive refractive correction for the entire optical system. This method allows for a quick and precise prescription determination for any type of optical correction.

The invention relates to an on-chip dynamic control device for the wavefront of a terahertz metasurface transmission wave or surface wave, and belongs to the technical field of electromagnetic wave wavefront control devices. Since the traditional phase gradient metasurface fails to dynamically control the wavefront of a transmission wave or surface wave, the present invention combines an integrated photosensitive material metasurface with a spatially coded light source to realize on-chip dynamic control of the wavefront of a terahertz transmission wave or surface wave. The device deposits a dielectric layer on a metal reflective bottom plate, and the top layer of the dielectric layer is divided into two regions: an excitation region and an intrinsic region. The excitation region is composed of a metal ring array with multiple openings uniformly distributed and photosensitive materials deposited at the openings. By controlling the intensity of the pump light source irradiating the photosensitive material, a 2-bit coding unit is formed. The excitation region is constructed according to a preset coding sequence. When a circularly polarized wave is incident on the surface of the excitation region, a transmission wave or surface wave can be generated. By changing the coding sequence, the phase of the transmission wave or surface wave is reconstructed, and the wavefront of the transmission wave or surface wave is dynamically controlled, thereby realizing an on-chip dynamic control device for the wavefront of a transmission wave or surface wave.

The invention discloses a conjugate differential interference self-correction method for a large-size plane variable-pitch grating, and belongs to the technical field of optical measurement, and the method comprises the steps: enabling the variable-pitch grating to be in a Littrow auto-collimation state, and measuring the positive and negative first-order diffraction wavefront of the variable-pitch grating through a laser topography interferometer; performing differential operation on the positive and negative first-order diffraction wavefronts; moving the variable-pitch grating by a displacement alpha along the positive direction of the X axis, measuring positive and negative first-order diffraction wavefronts at the moment, and performing differential operation; moving the variable-pitch grating by a displacement alpha along the negative direction of the X axis, measuring positive and negative first-order diffraction wavefronts at the moment, and performing differential operation to obtain a second displacement differential wavefront; and performing interference pseudo-shearing operation by using the initial differential wavefront, the first displacement differential wavefront and the second displacement differential wavefront, and solving a variable pitch parameter by using a least square method. According to the invention, the measurement efficiency and precision of the large-size planar two-dimensional variable-spacing grating are obviously improved.

The invention relates to a reflective double-beam interference exposure system reticle density and aberration considered adjustment method, which comprises the following steps: constructing a reticle density standard module, and generating a standard reference beam for adjusting the reticle density of an exposure system; a reflection type double-beam interference exposure system is built, points formed after + / -1-level standard reference beams are focused through an off-axis parabolic mirror serve as nominal focuses of all off-axis mirrors in a double-beam light path, the spatial position of the off-axis parabolic mirror is continuously adjusted, wavefront measurement is combined with a spherical interferometer, and the reflection type double-beam interference exposure system is obtained. And enabling the nominal focus of the off-axis mirror to coincide with the spatial position of the real focus, thereby completing the construction of the double-beam interference exposure system. According to the invention, the problem that the aberration and the scribed line density are difficult to accurately control at the same time in the adjustment process of the reflective double-beam interference exposure system is solved, and a new idea is provided for the high-precision adjustment of the meter-scale large-aperture reflective interference exposure system.

The invention discloses a solar spectrum frequency division combined heat and power generation system and an operation method, and relates to the technical field of renewable energy sources, and the method comprises the following steps: S001, building a coupling analysis baseline among irradiation parameters, heat distribution and optical characteristics, collecting the real-time temperature data and light beam wavefront information of a spectrum frequency divider under the condition of sun illumination, and calculating the real-time temperature data and light beam wavefront information of the spectrum frequency divider; and generating an estimated atlas of refractive index gradient distribution based on a thermally induced refractive index change rule. Through heat, light and force coupling control, accurate prediction, real-time identification and dynamic correction of the thermal lens effect are achieved, a closed-loop feedback mechanism is established, stable alignment of photoelectric and photo-thermal paths is guaranteed, the system energy efficiency and operation reliability are effectively improved, and the problems of deviation, energy efficiency reduction and part damage caused by a thermal lens in the prior art are solved.

The invention discloses a multi-image-source common exit pupil overlapping display system and method, and belongs to the technical field of optical imaging and display, and the system comprises a multi-image-source module which comprises a plurality of independent image generation sources and is used for providing different types of image information; the image wavefront guiding optical module is arranged behind each path of image source and is used for carrying out collimation, shaping, regulation and control and path guiding on light waves emitted by the multi-image source module and realizing consistent superposition of a plurality of heterogeneous image sources in spatial positions, angles and wavefront parameters at a common exit pupil superposition display surface P; the common exit pupil superposition display surface P is used for carrying out space and time fusion on wavefronts of all image sources to generate a composite image; and the detector module is arranged behind the common exit pupil superposition display surface and is used for receiving the fused composite image wavefront and converting the fused composite image wavefront into image data to be output. According to the system and the method, high-uniformity, high-resolution, high-dynamic-range and multispectral large-depth-of-field fusion imaging can be realized, so that higher requirements of modern simulators, visual systems and multidimensional sensing equipment on imaging quality and system performance are met.

The invention belongs to the technical field of optical element manufacturing, particularly discloses a compensation control method for wavefront distortion of a thermal bending surface of vehicle-mounted optical glass, and aims to solve the problem of wavefront distortion caused by non-uniform stress and thickness change in a thermal bending forming process. Comprising the following steps: performing local pre-deformation treatment in a non-optical function area of optical glass to form a compensation stress source; in the main bending forming stage, the glass is deformed to a preset threshold value, and the forming force is maintained; and stress release triggering operation is executed on the non-optical function area, so that the compensation stress source is controlled to release, additional adjusting force generated by the compensation stress source and main bending forming force act synergistically, accurate adjustment of the curved surface and the thickness of the optical function area is completed, and finally a stable balance locking structure is formed. According to the invention, systematic wavefront distortion is compensated and inhibited, and the product yield and the performance stability in a wide temperature range are improved while curved surface forming and optical performance optimization are synchronously completed.

The invention provides a photoetching aberration compensation driving parameter disturbance precursor prediction method and system, and the method comprises the steps: firstly, synchronously capturing a frequency band compensation residual error sequence of 3 * 3 grid measurement points of an aspherical lens, intercepting 30ms window data, generating a time-frequency spectrum matrix through Hamming window STFT, and then extracting three feature vectors; inputting the feature vector into a two-layer LSTM predictor to output a disturbance probability P and pre-judgment time delta t and Pgt; 0.7, triggering the resetting of the driving parameters; dynamically adjusting the iteration step length and the driving voltage based on the P and the delta t, and outputting the iteration step length and the driving voltage to a compensator to generate compensation wavefront correction aberration; if the wavefront error RMS value is gt; and 0.05 lambda, only updating the weight of the LSTM output layer and performing re-prediction to form a closed-loop compensation process.

The invention relates to the technical field of optical instruments, and provides a dimple telescope system based on a double-phase regulation and control super lens and a design method thereof, and the dimple telescope system comprises an objective lens, an eyepiece, a first super lens and a second super lens. The first super lens is arranged at the imaging plane position of the objective lens, is a local phase modulation type super lens and is used for implementing local phase modulation on an imaging area; and the second super lens is arranged at the pupil entrance plane position of the eyepiece, is a continuous phase type super lens, and is used for performing phase compensation and wavefront matching on the wavefront passing through the eyepiece. According to the invention, the double-phase collaborative design of the image plane local phase modulation superlens and the entrance pupil plane continuous phase compensation superlens is introduced into the Galileo telescope system, so that the unification of local high-resolution fovea imaging in the view field and the stability of the full-view-field image quality is realized on the premise of not changing the original optical path structure; and the aberration interference problem caused by local modulation of a single super lens is avoided.

The invention discloses a free-form surface imaging aberration propagation calculation and aberration control method. According to the method, on the basis of a given system light path, an object plane, an image plane, an entrance pupil and an exit pupil of each optical curved surface are calculated, and reference wave surfaces of a central view field at the entrance pupil and the exit pupil are calculated. A group of characteristic light is generated by an entrance pupil and a field of view of the sampling system, the optical path difference of the characteristic light of each field of view propagating from the entrance pupil of each curved surface to the exit pupil relative to the main light is calculated, and the aberration field of each curved surface is obtained by fitting the optical path difference of the full field of view; determining the contribution of each curved surface to the dominant aberration according to the dominant aberration of the current system and the aberration field of each curved surface, thereby determining the curved surface which is optimized first; the aberration is reduced by optimizing the curved surface parameters, corresponding to the current dominant aberration, of the curved surface, and the process is repeated until the design meets the requirements. The method can effectively guide the optimization of the free-form surface imaging system, reduces the deviation degree of the free-form surface while guaranteeing the imaging performance, and effectively reduces the processing and detection difficulty of the surface.

The invention relates to a quasi-differential wavefront segmentation double-beam interference device with a planar light path structural design, which has the structural characteristic of a non-closed optical path for transmitting a measurement light beam in a one-way manner. Space coherent light of a transverse mode vector filtering mechanism based on the Huygens principle / phased array principle instead of homologous transmission time coherent light is used as each light source, and a non-closed optical path is realized under the cooperation of a one-way transmission mode on a divided measuring light beam. The problem that the sum of the loop wavelength increment or the frequency increment of a closed path interference device is zero is solved, so that the purpose of measuring the first-level effect of anisotropic physical parameters of a measured object in a linear system is achieved, and the device is particularly suitable for immersion type online measurement. The optical elements have stable performance and sound self-adaptive mechanism and self-diagnosis capability through careful layout of the optical elements; and the method also has wide application prospects in basic physical research and novel navigation / positioning systems. The invention also provides a differential wavefront segmentation and semi-transparent and semi-reflective mirror beam combination interferometer device based on the planar light path structure design, and a wavefront segmentation interferometer device based on the planar light path structure design and provided with a pre-crossing area and a bending type one-way-two-way-common mode combination light path structure. The invention relates to a wavefront segmentation interferometer device of a one-way-two-way combined light path structure which is designed based on a planar light path structure and adopts polarization light splitting-beam combination, optical rotation processing of a reference light beam and original path returning, and a use method of an interference device.

This invention provides a wavefront design method and system based on a space-based early warning radar, including acquiring the system scanning time, radar range-azimuth ground coverage range, beam coverage overlap rate, radar azimuth beam center, and radar initial wavefront near-end down-view angle; determining the 3-dB elevation main lobe beamwidth of the current wavefront based on the near-end down-view angle value of the current range wavefront; determining the far-end down-view angle value of the current wavefront based on the beam center calculation result of the current range wavefront; iteratively updating the near-end down-view angle of the next range wavefront to the near-end down-view angle of the current wavefront, and outputting all range wavefront division results; sequentially calculating the 3-dB azimuth main lobe beamwidth based on the near-end spatial cone angle of each azimuth wavefront, sequentially updating the beam center and far-end down-view angle of the azimuth wavefront, iteratively processing until the azimuth-ground distance meets the given azimuth coverage requirements; and finally outputting the wavefront design calculation results that meet the range-azimuth coverage requirements and the required dwell time for each wavefront.

A radar level gauge system, for determining a filling level of a product in a tank, comprises a transceiver, an antenna assembly, and processing. The antenna assembly comprises a dielectric antenna body having a conical external surface facing an interior of the tank and an internal surface facing away from the interior of the tank, when the antenna assembly is arranged at the opening in the tank wall, and an antenna feed coupled to the transceiver, and configured to propagate the transmit signal towards the internal surface of the dielectric antenna body as electromagnetic waves with convex wavefronts. The internal surface of the dielectric antenna body is shaped to refract the transmit signal from the antenna feed in such a way that the transmit signal propagates towards the surface of the product in the tank as electromagnetic waves with substantially planar wavefronts, following passage through the dielectric antenna body.

The utility model discloses a light interference and diffraction experiment device, which comprises a laser transmitter and a first experiment part, the first experiment part comprises an interference instrument and a diffraction instrument; the interference device is of a thin sheet structure with uniform thickness, can be arranged on a propagation path of a laser beam, and divides the laser beam incident to the interference device into two emergent beams, so that the interference phenomenon of light is observed; the diffraction instrument can be arranged on the propagation path of the laser beam, one half of the laser beam entering the diffraction instrument is shielded, and the other half of the laser beam forms a spherical wave at the edge of the diffraction instrument, so that the diffraction phenomenon of light is observed. According to the utility model, the first experiment part can reproduce a Young's double-slit interference experiment and a Fraunhofer single-slit diffraction experiment only by using a flat sheet under the condition that double slits and single slits are not needed, and can intuitively show physical mechanisms such as wave splitting surfaces and wave surface limitation; and experiments of circular hole diffraction, cross diffraction, Poisson bright spots and the like can be demonstrated.

The application generally relates to a polarimetric wavefront light detection and ranging (PolLidar) sensor. The PolLidar sensor includes an emitter module having an optical emitter aperture, a receiver module having an optical receiver aperture, and a mirror for scene scanning. The receiver module is separate from the emitter module.

The invention discloses a high-precision multi-channel data acquisition method, relates to the technical field of multi-channel data acquisition, and is used for solving the problem that the risk of beam mode distortion caused by pumping current fluctuation is increased. Pumping current is acquired in a laser cavity to calculate a fluctuation coefficient, and an alternating-current impedance amplitude is acquired in combination with impedance detection; carrying out standardized multiplication to generate an electric strength coefficient, calibrating a statistical coefficient in time to obtain a reference threshold value, calling a gain factor, obtaining a light beam radius variable quantity by using an extra-cavity detector, calculating a down-regulation ratio to obtain a down-regulation threshold value, comparing the electric strength coefficient with the down-regulation threshold value, and if a light beam mode is distorted, carrying out standard multiplication; if yes, triggering the multi-channel wavefront sensing array to collect information and check triggering consistency, and if not, correcting a current fluctuation coefficient based on light beam intensity, combining impedance to generate an update coefficient, comparing the update coefficient with a down-regulation threshold value, and if the update coefficient exceeds the limit, triggering an alarm and outputting a protection instruction; and beam mode distortion caused by pumping current fluctuation is effectively avoided.

The invention provides a method for realizing efficient frequency multiplication in a nonlinear scattering medium through wavefront shaping. The method for realizing efficient frequency multiplication in the nonlinear scattering medium through wavefront shaping comprises the following steps: S1, providing a beam of fundamental frequency light with the wavelength of 1064nm to form horizontal polarized light; s2, phase modulation is carried out on the adjusted light through a spatial light modulator, so that light field spatial distribution is optimized, and scattering interference is reduced; and S3, enabling the modulated light to enter a nonlinear scattering medium, and generating second harmonic light. According to the method for realizing high-efficiency frequency multiplication in the nonlinear scattering medium through wavefront shaping, light field propagation is optimized through a wavefront shaping technology, high-efficiency frequency multiplication in the nonlinear scattering medium is realized, and a higher-precision nonlinear optical application solution is provided.