548 results about "Wavefront" patented technology

The embodiment of the invention provides an environment monitoring method and system based on 5G. According to the method, a dynamic coupling sensing field is constructed in a 5G network coverage domain, an adaptive topology with nonlinear interaction of parameters is established, and when parameter abnormity is detected, differential geometric reconstruction of a 5G network slice control surface is triggered based on Riemannian curvature change. And constructing a space-time manifold space at the 5G edge computing node, decomposing and extracting a diffusion principal curvature direction, and iteratively solving a propagation rate of an abnormal parameter in combination with a geodesic equation to generate a diffusion leading edge envelope surface. And according to the main curvature distribution characteristics of the diffusion leading edge envelope surface, constructing a dynamic sampling optimizer, generating an exponential decay sampling function, and deploying a directional sensing wavefront. And carrying out conformal tightening processing on the sampling function and the geographic grid to generate an interactive holographic manifold, establishing an aging judgment criterion of an abnormal level based on curvature 2-form characteristics, and triggering a graded early warning pulse wave packet. According to the technical scheme provided by the embodiment of the invention, the real-time performance and precision of environment monitoring are improved.

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 discloses a far-field imaging system, a metasurface grating and an imaging terminal, and relates to the technical field of image generation. Dynamic environment compensation and imaging quality optimization are realized through cooperation of multiple modules of the system: the environment temperature is read in real time, the refractive index of the metasurface grating is corrected according to a pre-stored mapping relation, and a target wavefront function is constructed and dispersed to obtain an initial phase distribution matrix; dividing a focusing area in combination with a user sight line, and compensating and regulating a phase distribution matrix by voltage gradient; based on the divided buffer and background regions, a multi-region sampling rate is configured to generate a mask, and the collection efficiency of the key region is improved; monitoring far-field information change in real time, and selecting an interpolation or total variation strategy to update the image; by means of image definition feedback, a secondary phase correction term is superposed to optimize a phase distribution matrix; the problems of traditional far-field imaging in the aspects of environment adaptation, dynamic focusing, data acquisition and imaging quality are solved, and the method is suitable for augmented reality glasses and the like.

The invention discloses a wavefront correction system and method for an offshore quantum key distribution system, and relates to the technical field of wavefront correction, and the system comprises a laser, a transmission light path, a redundant light optical antenna, at least three local oscillator light optical antennas, a signal preprocessing module and a wavefront correction module. The laser generates an initial optical signal; the transmission optical path divides the initial optical signal into a local oscillator optical signal and a redundant optical signal, and transmits the local oscillator optical signal, the redundant optical signal and an echo signal; the local oscillator optical antenna transmits a local oscillator optical signal and receives a local oscillator echo signal in a corresponding direction; the redundant light optical antenna transmits a redundant light signal and receives a redundant echo signal in a corresponding direction; the signal preprocessing module preprocesses and corrects the local oscillator echo signal and the redundant echo signal to obtain a target beam signal; and the wavefront correction module calculates a real-time atmospheric turbulence value according to the target beam signal to carry out wavefront correction. The three-dimensional velocity vector component of the carrier can be measured at the same time.

The invention discloses a high-throughput multi-row parallel high-speed scanning high-resolution microscopic imaging device and method based on adaptive optics. A spatial light modulator is used for carrying out pixel-level regulation and control on a light beam phase to generate a strip-shaped light spot, and a special arrangement mode of a detector array is used for realizing a one-to-many relationship between a scanning line and an imaging line and realizing improvement of an imaging speed, a signal-to-noise ratio of an imaging result and a resolution ratio; a full-digital area array wavefront regulation and control method is utilized, a spatial light modulator is used for rapidly and dynamically compensating a laser wave surface according to imaging result feedback, the laser wave surface is free of distortion, and the influence of aberration on an imaging result is reduced; designing a double telecentric Fourier transform structure capable of simultaneously keeping rotational symmetry of object plane and image plane light beams, and realizing distortionless mapping of scanning light beam quality and a linear signal system; a switchable design of two scanning modes is developed, high-flux, high-resolution and high-speed light field scanning is realized, and the advantages of large visual field, high resolution and high frame rate imaging are achieved.

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 discloses a high-capacity optical communication adaptive damage compensation and demodulation system, which is applied to the technical field of optical communication. Comprising a beam splitter, an XFTC-Net model, a wavefront corrector and an OAM demultiplexer. The beam splitter divides the received distorted OAM light beam into transmission light and reflection light, the transmission light and the reflection light are distorted OAM information light beams, the transmission light is input to the wavefront corrector, the reflection light is input to the XFTC-Net model, the wavefront corrector completes distorted OAM light beam adaptive damage compensation by using a first output result of the XFTC-Net model, and the distorted OAM light beam adaptive damage compensation is realized by using a second output result of the XFTC-Net model. And the OAM demultiplexer completes OAM light beam demodulation by using the second output result of the XFTC-Net model. According to the invention, on the basis of completing atmospheric turbulence distortion phase reconstruction, the mode identification of the OAM light beam is realized, a probe light beam path does not need to be additionally arranged, and while the correction precision is ensured, the system complexity is effectively reduced, and the OAM integrating miniaturization and high precision is realized.

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.

The invention discloses a random two-step inclined phase shift wavefront detection method based on deep learning, and solves the problems of harsh requirements on a measurement environment and large measurement errors in the prior art. The method comprises the following steps: carrying out analogue simulation to obtain two interferogram databases; establishing a neural network model, and dividing the interferogram database into a training set and a test set; inputting the training set into the neural network model for training to obtain a trained neural network model; inputting the test set into the trained neural network model for testing, and outputting a wavefront phase calculation value; calculating an error between the wavefront phase calculation value and the wavefront phase simulation value until a new neural network model is obtained; and obtaining multiple frames of interference fringe patterns of the to-be-detected optical element, inputting the interference fringe patterns into the new neural network model, and outputting a real wavefront phase of the to-be-detected optical element, thereby realizing random two-step inclined phase shift wavefront detection based on deep learning. The method is simple in operation and high in measurement precision.

The present disclosure provides systems and methods for coupling light in imaging systems. One such system comprises a metalens doublet structure having a first substrate; a first metalens structure provided at a surface of the first substrate and comprising a plurality of first scatterers; and a second metalens structure provided at a second substrate or on another surface of the first substrate and comprising a plurality of second scatterers. Accordingly, the plurality of first scatterers is configured to reshape the intensity distribution of light that is received by the first metalens structure at a location of the second metalens structure; and the plurality of second scatterers is configured to change a wavefront of the light outputted from the first metalens structure and incident on the second metalens structure.

The invention discloses an interferometer instrument transfer function measuring method based on a spatial light modulator, which comprises the following steps of: carrying out inherent phase difference compensation on the spatial light modulator; generating a group of sinusoidal phases with different periods and the same amplitude, and measuring sinusoidal phase results under different sinusoidal phases by using a wavefront interferometer and a spatial light modulator; and calculating an ITF value according to the obtained sinusoidal phase results under different sinusoidal phases, and drawing a fitting curve graph with the ITF value as the ordinate and the frequency as the abscissa to obtain a transfer function curve of the wavefront interferometer to be measured. The invention aims to realize the method for measuring the transfer function of the interferometer instrument, which can meet the international standard definition and is not restricted by processing conditions, and the measurement precision, the frequency coverage range and the flexibility are improved.

The invention discloses a polarization imaging device and a polarization analysis method based on single-frame polarization collinear holography, and relates to the field of polarization imaging.According to the polarization imaging device, through combination of optical elements such as a half-wave plate, a Wollaston prism and a CCD camera, spatial multiplexing of a detector plane is carried out, and the polarization collinear holography is obtained. And four polarization collinear holograms can be simultaneously acquired by a single frame. According to the polarization analysis method, a Fourier transform auxiliary angular spectrum method is adopted to analyze an intensity distribution diagram of a polarization collinear hologram to estimate initial wavefront distribution, and an iterative finite support constraint selection method is adopted to solve the problem of twin images in the polarization collinear hologram. And further quantizing a complete Jones matrix and a complete Stokes parameter from the finally reconstructed complex amplitude information. The invention solves the problems of high complexity and long processing time caused by independent reconstruction of amplitude, phase and polarization in the traditional polarization holographic technology, and effectively solves the problem that the traditional off-axis polarization holographic imaging system limits the size of an imaging field of view.

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 discloses a pentaprism scanning wavefront detection device and method based on a pyramid interferogram. The device comprises a guide rail, a pentaprism, a beam splitter prism, a plane spectroscope, a cube-corner prism, an imaging lens and a CCD camera. The method comprises the following steps: firstly, building a measuring light path in front of a to-be-measured wave surface, ensuring that a guide rail is parallel to the to-be-measured wave surface, and obtaining an interference pattern formed by a light beam reflected by a plane spectroscope and a light beam reflected by a cube-corner prism; then, the pitching and inclination angles of the plane spectroscope are adjusted, so that the number of fringes in an interferogram area is 20-50; then the guide rail is moved to scan the wavefront to be measured, and interferograms of the pentaprism at different positions are obtained; and finally, extracting inclination amounts of different positions of the measured wave surface from the interference pattern by using a fast Fourier transform (FFT) algorithm, and obtaining surface shape distribution of the measured wave surface through polynomial fitting. The device is simple in structure and low in cost, can accurately measure the emergent wave of the collimation system, and provides an effective basis for the adjustment of the collimation system.

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 discloses a wavefront restoration method based on multi-path integration, and relates to the technical field of wavefront measurement and restoration, and the method comprises the following specific steps: data collection and initialization: carrying out the preliminary detection of wavefront through a Hartmann sensor microlens array, dividing the space where the wavefront is located into a plurality of rectangular small regions, according to the method, a multi-path calculation phase evaluation value set is introduced, all shortest paths from an initial point to each to-be-estimated point are found by using a shortest path search algorithm, it is ensured that multiple possibilities of wavefront propagation can be considered in the calculation process, and by introducing a path weight distribution mechanism, the estimation accuracy of the wavefront propagation is improved. According to the method, geometric characteristics, optical characteristics and correlation with surrounding paths of paths are comprehensively considered, each path is endowed with different weights, forward integration is carried out on discrete data results by adopting an innovative mixed integration algorithm, local detail loss or error amplification is effectively avoided, and thus a more accurate wavefront phase value is obtained.

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 invention discloses an underwater robot imaging algorithm optimization method based on deep learning, and relates to the technical field of underwater robots, and the method comprises the steps: firstly carrying out the dynamic capture of an underwater light field through employing a curved surface CMOS array sensor, and adaptively adjusting the focal length of the curved surface CMOS array sensor according to the change of the light intensity of a scene, and activating the local pixels when the scene changes; designing a quantum convolution kernel, mapping classical convolution operation into a quantum circuit, constructing a hybrid calculation pipeline, and performing quantum state joint coding and cross-domain feature fusion on optical and acoustic data to obtain fused data; through quantum Fourier transform and quantum convolution, data of different modalities are fused, the accuracy and robustness of imaging are improved, weights of optical images and sonar data can be dynamically adjusted under different water turbidity and illumination conditions, the fusion effect is improved, model errors are reduced, metasurface parameters can be adjusted in real time, sub-wavelength wavefront regulation and control are achieved, and the method is suitable for large-scale popularization and application. And the adaptability and robustness of the imaging system are improved.

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 belongs to the technical field of optical measurement, and particularly relates to a digital holographic microscopy system phase distortion correction method based on adaptive optics, which has the advantage that optical wave complex amplitude information can be acquired in a wide field by means of digital holographic microscopy, and uses a distortion phase image measured by a digital holographic microscopy system as input to correct phase distortion of the digital holographic microscopy system. And iterating the image by using an optimization algorithm until the image evaluation function converges, and obtaining a correction pattern for removing phase distortion. And uploading the correction pattern to a self-adaptive correction device and modulating the wavefront of the light wave to finally realize accurate compensation of phase distortion. The method can provide an in-situ, accurate and rapid phase distortion correction mode and means for the field of optical microscopic imaging, especially the field of quantitative phase imaging.

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.

A wavefront manipulator which comprises a holographic assembly and an optical element is provided. The optical element includes at least one surface, which is totally reflective for an ascertained range of incidence angles, for emitting light waves onto the holographic assembly. The holographic assembly includes at least one reflection hologram for reflecting light waves emitted onto the holographic assembly via the optical element. The optical element includes a coupling device for coupling light waves into the wavefront manipulator. The coupling device includes at least one prism.