2080 results about "Spatial light modulator" patented technology

The invention discloses a special environment laser radar system and method based on polarization modulation and laser coding. The laser radar system comprises a polarization modulation laser emitting unit, a multi-channel receiving unit and a compressed sensing reconstruction unit. The polarization modulation laser emission unit comprises a laser, a beam expanding module, a spatial light modulator, a micro galvanometer array, a spatial filter and a first focusing lens which are arranged in sequence; the multi-channel receiving unit comprises a second focusing lens, a polarization beam splitter and a single-pixel detector array which are arranged in sequence; and the compressed sensing reconstruction unit comprises a compressed sensing processing module, an image reconstruction module and a loop adaptive control module which are arranged in sequence. The anti-interference capability in a complex environment is enhanced through polarization modulation, the detection resolution and the signal-to-noise ratio are improved in combination with laser coding, the imaging quality and stability of the laser radar in a special environment are greatly improved, and the method can be widely applied to the fields of military reconnaissance, disaster rescue, unmanned driving and the like.

The invention provides an optical image encryption method and system based on a partially coherent non-diffracting light beam, and belongs to the technical field of optical encryption and information transmission. Encoding to-be-encrypted image information into the light field cross-spectral density function; the method specifically comprises the following steps: discretizing an image as an expansion coefficient of a power spectral density function at a light source under a pseudo-mode substrate, and constructing a cross spectral density function; a complex amplitude modulation algorithm is adopted to convert light field complex amplitude distribution into a pure phase hologram, the pure phase hologram is loaded to a spatial light modulator, a multi-mode incoherent superposition partially coherent non-diffraction light beam is generated, and the multi-mode incoherent superposition partially coherent non-diffraction light beam interferes with a reference light beam to obtain a light field image; performing coordinate transformation and frequency domain filtering on the light field image to extract a complex coherence degree function; and reconstructing and restoring the original image information in combination with a preset key and a digital inversion algorithm. According to the method, the light beams are constructed based on pseudo-mode superposition, image hidden coding, transmission and decryption are realized by utilizing the characteristics of partially coherent light and non-diffraction light beams, and the method is suitable for optical communication and security information transmission.

A spatial light modulator and a projection system are provided. The spatial light modulator includes a substrate layer, a first electrode layer, a first metasurface layer, a phase change material layer, a second electrode layer, and a first flat layer. The first electrode layer and the second electrode layer are respectively disposed on opposite sides of the substrate layer and the first flat layer that are parallel to each other, and the first metasurface layer and the phase change material layer are disposed between the first electrode layer and the second electrode layer. The first metasurface layer includes at least two metasurface units that are sequentially arranged, and a resonance frequency of each metasurface unit corresponds to a preset incident optical wavelength of each metasurface unit. The spatial light modulator performs phase modulation on incident light through the first metasurface layer and the phase change material layer.

The invention provides a high-power multimode fiber laser amplifier based on wavefront shaping. The high-power multimode fiber laser amplifier comprises a seed light wavefront control unit, a multimode gain fiber amplification unit and an output light spot detection and feedback unit, the seed light wavefront control unit is used for carrying out wavefront modulation on the seed light output by the polarization seed laser by using a spatial light modulator loaded with a phase diagram; the multimode gain optical fiber amplification unit is used for performing power amplification on the seed light which is output by the seed light wavefront control system and is subjected to output wavefront modulation; and the output light spot detection and feedback unit is used for outputting the laser of most power of the multimode gain fiber amplification system, collecting the rest laser of a small part of power for far-field light spot information detection, calculating the corresponding far-field barrel medium power based on the detected far-field light spot information, and outputting the far-field barrel medium power. And the power in the far-field barrel is used as an evaluation function to operate an optimization algorithm to generate an optimal phase diagram, and the optimal phase diagram is loaded on the spatial light modulator to realize closed-loop feedback control.

The invention discloses a differential nonlinear competitive super-resolution microscopy method and a differential nonlinear competitive super-resolution microscopy device. Light beams emitted by the same light source simultaneously irradiate the surface of a fluorescent sample. Wherein one light beam is focused on a sample after passing through a spatial light modulator to form a high-energy hollow light spot for generating a saturation effect; the other beam of light is modulated into time sequence light by an acousto-optic modulator, the time sequence light is focused on the sample to form a low-energy solid light spot, and signal light emitted by each scanning point of the sample is collected; and performing intensity control on the light intensity of the hollow light through a light intensity modulation device to obtain two nonlinear competition result images, and performing differential processing to obtain a super-resolution image. The device is simple and convenient to operate; on the basis of a competition mechanism of solid spots and hollow spots during sample fluorescence excitation, a high-resolution image can be obtained under low illumination light intensity by utilizing differential processing, and negative values of the differentiated image are greatly reduced.

The invention discloses a phase regulation and control method, device and system for holographic optical tweezer potential well stiffness, and the method comprises the steps: calculating a decomposition matrix formula, a matrix expression and a Hermi matrix expression according to input system configuration parameters, carrying out the expansion of a stiffness coefficient of an optical trap through the Hermi matrix expression, and obtaining a stiffness coefficient expansion expression, performing phase optimization on the spatial light modulator based on a pixel symmetry rule to obtain an optimized phase value, generating a regulation and control instruction through the optimized phase value, sending the regulation and control instruction to the spatial light modulator, and recalculating a coefficient value of the stiffness coefficient expansion expression, and if the coefficient value or the number of optimization times meets the iterative optimization condition, returning to the step of performing phase optimization on the spatial light modulator. According to the phase regulation and control method, the Hermi matrix expression and the stiffness coefficient expansion expression can be solved according to the system configuration parameters, phase modulation is carried out on the light beam by generating the regulation and control instruction, and the application effect of independent optimization of the potential well stiffness phase is improved through phase iterative optimization.

A real-time manipulating device for microscopic particles comprises a first laser suitable for generating first laser light; the optical tweezer array generation assembly comprises a spatial light modulator which is suitable for modulating the wavefront of the first laser according to the received middle hologram to obtain a first modulated laser and modulating the wavefront of the first laser according to the received target hologram to obtain a second modulated laser; the focusing assembly is suitable for focusing the first modulated laser to generate an intermediate optical tweezers array, and is suitable for focusing the second modulated laser to generate a target optical tweezers array; the real-time processing assembly is suitable for simultaneously determining a plurality of middle holograms according to respective initial positions and respective final positions of the plurality of target microscopic particles, and is also suitable for transmitting the plurality of middle holograms to the optical tweezer array generation assembly according to a time sequence; the real-time processing assembly is also suitable for transmitting the target hologram to the optical tweezers array generation assembly.

The invention discloses a liquid guide laser processing device and method based on double-beam phase adjustment, belongs to the technical field of laser processing, and aims to reduce the width of a laser beam. The device comprises a laser light source, a first polarization state modulator, a beam splitter, a spatial light modulator, a second polarization state modulator, a polarization beam combiner and a coupler. A laser light source emits linearly polarized light, the linearly polarized light is converted into circularly polarized light through a first polarization state modulator, then the circularly polarized light is separated into first linearly polarized light and second linearly polarized light through a light beam separator, and on a second linearly polarized light transmission light path, a spatial light modulator adjusts the marginal region phase of the circularly polarized light to enable the marginal region phase to differ from the marginal region phase of the first linearly polarized light by a half cycle. And the second polarization state modulator adjusts the polarization direction to be the same as that of the first linearly polarized light, the polarization beam combiner combines the two beams of light, the coupler couples the combined laser beams to the liquid jet flow, and the liquid jet flow acts on the workpiece to be machined, so that optimization of the diameter of the laser beams is achieved.

The invention relates to a polarization-independent spatial light obstacle avoidance system and method, and relates to the technical field of optical communication, and the polarization-independent spatial light obstacle avoidance system comprises a light source; the dual-polarization assembly comprises a light path element and a spatial light modulator, the light path element is used for dividing incident light output by the light source into two polarized light and converting the two polarized light into target polarized light capable of being modulated by the spatial light modulator, and the spatial light modulator is written into at least one complex amplitude of the Airy ring subjected to Fourier transformation so as to modulate the target polarized light; and the lens is used for generating a bottle-shaped light beam for obstacle avoidance based on the target polarized light modulated by the spatial light modulator. According to the invention, signals in any polarization state can be processed, and meanwhile, the bottle-shaped light beam is used for bypassing an obstacle at a specified position, so that the signal transmission efficiency and quality are ensured.

The invention discloses a defect-free neutral atom array preparation method and system based on dynamic optical tweezers rearrangement, and belongs to the technical field of quantum computing. The invention discloses a defect-free neutral atom array preparation method and system based on dynamic optical tweezers rearrangement. A static optical tweezers array is generated through a spatial light modulator to capture initial atoms, an optimal rearrangement path is planned by adopting a Hungary algorithm, and dynamic optical tweezers are generated through an acousto-optic deflector to implement atom grabbing, moving and releasing operation. According to the method, a weighted Gerchberg-Saxton algorithm is innovatively combined with real-time image feedback, so that the precise rearrangement of the atom array is realized. Important experimental technical support is provided for quantum calculation and simulation, and the application progress of the neutral atom array in the fields of quantum error correction, fault-tolerant quantum calculation, quantum simulation and the like is effectively promoted.

The embodiment of the invention discloses laser processing equipment and a processing method. The laser processing equipment can comprise a light source incident light path system, a spatial light modulator and a focus lens, wherein the light source incident light path system is used for emitting a polarized light beam adaptive to the spatial light modulator; the spatial light modulator is used for regulating and controlling the phase distribution of the polarized light beam according to a phase hologram determined based on a preset focus set; and the focusing lens is used for focusing the regulated polarized light beam to obtain a processing focus set.

An all-optical neural network that utilizes light beams and optical components to implement layers of the neural network is disclosed herein. The all-optical neural network includes an input layer, zero or more hidden layers, and an output layer. Each layer of the neural network is configured to simulate linear and nonlinear operations of a conventional artificial neural network neuron on an optical signal. In an embodiment, the optical linear operation is performed by a spatial light modulator and an optical lens. The optical lens performs a Fourier transformation on the set of light beams and sums light beams with similar propagation orientations. The optical nonlinear operation is implemented utilizing a nonlinear optical medium having an electromagnetically induced transparency characteristic whose transmission of a probe beam of light is controlled by the intermediate output of a coupling beam of light from the optical linear operation.

The invention provides a face image privacy protection recognition method based on optical coding and reverse feature enhancement, and relates to the technical field of computer vision recognition, and the method comprises the steps: S1, obtaining a face data set, carrying out the data enhancement, and constructing a face enhancement data set; s2, constructing a binary neural network convolutional coding layer based on straight-through estimator quantization, and performing optical coding on the face enhancement data set; s3, constructing a reverse feature enhancement neural network model based on CNN and Transform double-channel multiplexing, and carrying out feature dimension increase; s4, performing joint optimization on the neural network coding layer and the dual-channel multiplexing reverse feature enhancement neural network model by using mixed constraints; and S5, constructing a face embedding database, and comparing the high-dimensional coding value of the single-pixel detection value with features in the face embedding database to realize face recognition. According to the invention, through joint optimization of the neural network binarization convolution coding layer used for optical coding of the spatial light modulator and the dual-channel multiplexing reverse feature enhancement model, the recognition precision is improved.

The invention provides a large-view-field and high-temporal-spatial-resolution light sheet imaging system and method, and relates to the field of optical microscope imaging, and the system comprises a laser which is used for generating Gaussian laser; the 1 / 2 wave plate is used for adjusting the polarization direction of the laser; the spatial light modulator is used for light field regulation and control, and the Gaussian laser is modulated into a bent light beam through the spatial light modulator; the scanning galvanometer is used for synchronously scanning the modulated exciting light and controlling the light beam to form area array imaging on the sample; the scanning lens is positioned behind the galvanometer and is used for collecting the laser beams subjected to area array scanning, so that the laser is focused to a target area of the sample; the tube lens I is matched with the illumination objective lens to form a microscope system; the sample pool is used for placing and fixing a sample; a four-dimensional displacement table, a detection objective lens, an optical filter and a camera. According to the invention, through LSFM imaging of the curved light beam with the axial focal length obviously stretched, high-flux three-dimensional imaging with large field of view and high spatial-temporal resolution is realized.

An adjustment method of a laser processing apparatus includes a spatial light modulator adjustment step of adjusting a spatial light modulator into a state ready for splitting a laser beam emitted from a laser oscillator and applying a plurality of laser beams such that laser beams will have a desired positional relation, a processing mark formation step of operating the laser oscillator to apply the laser beams to a wafer such that a plurality of processing marks is formed, an imaging step of stopping the laser oscillator, and imaging the processing marks formed at the wafer, and an aberration correction step of correcting aberration of the condenser by comparing the desired positional relation and a positional relation among the imaged processing marks, and adjusting the spatial light modulator such that the positional relation among the processing marks conforms to the desired positional relation.

The invention discloses a target rotation speed measurement method and device for phase compensation based on polarization assistance, belongs to the technical field of laser rotation speed measurement, and aims to solve the problem that the rotation speed of a moving target cannot be precisely measured in atmospheric turbulence in the prior art. According to the scheme, laser is subjected to polarization and orbital angular momentum composite modulation through a group of spatial light modulators to generate a polarized vortex light beam, and the polarized vortex light beam is emitted by an emission system, passes through atmospheric turbulence and irradiates a rotating target object to generate an echo signal; stokes polarization information before and after distortion of the polarized vortex beam is extracted as input information of a GS algorithm, a compensation phase screen is output after the input information is processed by a distortion correction module, phase correction is carried out on left and right rotation polarization components of the polarized vortex beam, and a detection processing module detects the polarization components of the vortex beam and obtains Doppler frequency shift amount; and the rotation speed of the moving target is calculated through the rotation speed calculation module.

The invention relates to the technical field of laser micromachining, in particular to a TGV drilling machining system and method based on a space-time modulation Bessel beam, an initial laser beam is output through a laser device, the initial laser beam is modulated into a dynamic pulse sequence through a pulse chirp regulation and control module, axial energy attenuation is compensated, a machining subsystem generates the Bessel beam, and the TGV drilling machining system and method based on the space-time modulation Bessel beam are obtained. The angle is finely adjusted in real time through piezoelectric driving, and a dynamic spatial light modulator loads an exponential decay type phase mask, so that light beam airspace shaping, non-diffraction light beam generation, pulse time sequence and phase parameter synchronous control and high-peak power pulse array are realized, and finally, integrated micro-perforation and channel modification of the glass substrate are realized; and the machining efficiency and precision are obviously improved.

The invention discloses an infrared super-resolution imaging method and an infrared super-resolution imaging system based on nerve compression self-coding, in a training stage, a physical imaging process is modeled into an optical degradation encoder according to a compression sensing theory, and a fuzzy operation is combined by introducing a learnable binarization mask, so that a super-resolution image is obtained. Simulating a sparse coding process of compressed sensing to obtain sparse representation of the input image; restoring the sparse representation into a high-resolution image by using a CNN-based super-resolution decoder; in the reasoning stage, the optical degradation encoder is replaced by a real sampling process, and the optimized binarization mask is used as a mask set in the spatial light modulator and is finally projected to an image collected by a sensor; and the trained CNN model is also stored and is used for carrying out a super-resolution task on a really captured coded image. According to the invention, an efficient and reliable solution is provided for super-resolution reconstruction of the low-resolution infrared image.

A multimodal microscope having a light source for transmitting excitation light, an illumination beam path having a microscope objective for guiding the excitation light onto and / or into a sample, at least one first spatial light modulator being present in the illumination beam path for manipulating the excitation light, a detector for detecting detection light emitted by the sample owing to illumination with the excitation light, a detection beam path, comprising the microscope objective or a further microscope objective, for guiding the detection light onto the detector, and a controller at least for controlling the first spatial light modulator. The multimodal microscope includes a switchable optical functional group, which is switchable at least into a first and a second switching state, and the first spatial light modulator is situated either in or in the vicinity of an intermediate image plane or a pupil plane of the illumination beam path, depending on the switching state.

The invention relates to the technical field of optical communication related calculation, in particular to an experimental method and device for measuring a vortex beam orbital angular momentum spectrum based on coaxial interferometry, and the device comprises a helium-neon laser, a beam-expanding collimation system, a light splitting modulation assembly, a spatial light modulator, a phase polarization adjustment assembly and a CCD camera. A spatial light modulator is arranged on a light path of a Gaussian beam output by the helium-neon laser, and a CCD camera is arranged at the tail end of the light path of the beam modulated by the spatial light modulator; the beam expanding and collimating system and the light splitting and modulating assembly are sequentially and coaxially arranged on a light path between the helium-neon laser and the spatial light modulator, and the phase polarization adjusting assembly is coaxially arranged on a light path between the spatial light modulator and the CCD camera. According to the invention, stable coaxial interference of the vortex beam and accurate measurement of the orbital angular momentum spectrum can be realized by using a small amount of experimental equipment, and the construction difficulty of an experimental interference light path is greatly reduced.

The invention relates to a focusing regulation and control method and device based on a vortex structure light field penetrating through a large-scale scattering medium, and the method specifically comprises the steps: generating a collimated and expanded laser beam through a laser, carrying out the phase modulation of the laser beam through a spatial light modulator, and collecting a transmission speckle image related to the scattering medium through the combination of an sCMOS camera; and obtaining an optimal phase according to a focusing index quantity fed back by a focusing area by combining a genetic neural network algorithm with the vortex structure light field, and realizing speckle focusing through multiple iterations. Compared with the prior art, a vortex structure light field method is introduced to improve the feedback focusing regulation and control effect, the problem that a traditional feedback modulation algorithm cannot focus a large-scale scattering medium is solved, and the focusing intensity is remarkably superior to that of a lens focusing method and a wavefront shaping focusing method based on Gaussian beams.

The invention provides a spatial light modulator, a self-checking device thereof and a light computing device, and relates to the technical field of optical modulation.The spatial light modulator comprises an incident waveguide structure, a covering plate, a liquid crystal layer, a substrate and an emergent waveguide structure; the incident waveguide structure is optically coupled with the cover plate and is used for guiding externally incident laser into the cover plate at a preset angle; the covering plate is used for enabling laser to be propagated in the covering plate in a total reflection form; the substrate bears the liquid crystal layer, integrates the driving circuit and is used for applying regulation and control voltage to the liquid crystal layer; the liquid crystal layer is arranged on the lower side of the covering plate and used for conducting phase modulation on the laser transmitted to the liquid crystal layer in a total reflection mode in response to the regulation voltage. And the emergent waveguide structure is optically coupled with the covering plate and is used for guiding the laser modulated by the liquid crystal layer out of the covering plate to a free space. According to the spatial light modulator, efficient spatial modulation and accurate control of the light field are realized, so that the integration and function accuracy of the spatial light modulator in self-inspection and light calculation are improved.

The invention relates to the technical field of laser shaping, in particular to a light spot shaping method and system based on a spatial light modulator, and the method comprises the steps: providing and expanding an incident laser beam in Gaussian distribution, and obtaining a collimated and expanded beam; irradiating an incident laser beam to a spatial light modulator, loading a preset phase modulation pattern to modulate a wavefront phase, and outputting a phase modulation beam; the phase modulation light beam is input into a 4f imaging system, a spatial light modulator is located on the front focal plane of a first lens, and the light beam forms a light field with target intensity distribution on the rear focal plane of a second lens after passing through the system; and the light field is focused on the surface of a workpiece to be processed through an objective lens to form a flat-topped light spot. According to the scheme, uniform light intensity distribution can be flexibly generated without replacing optical elements, the uniformity and utilization efficiency of laser energy in a machining area are remarkably improved, and the problem of material damage or insufficient edge machining caused by too strong center energy is effectively solved.

The invention discloses an inclined wave surface sub-aperture stitching interference detection method based on a spatial light modulator, and relates to the field of optical detection. Light emitted by the laser is collimated and expanded and then enters the polarizing beam splitter; the reflected light is used as a reference light beam, and the transmitted light is used as a test light beam; a test light beam enters the spatial light modulator, is subjected to phase modulation by the spatial light modulator, passes through the lens and then forms standard spherical waves with different inclination angles, and zero detection is carried out on sub-apertures divided in different regions. The spatial light modulator is used as an ideal point source array generator to be matched with the imaging lens, so that required ideal inclined spherical waves can be generated according to different parameters of a measured piece, and compared with a traditional point source generator, the device has high universality. And for a large-aperture complex curved surface, sub-aperture splicing can be realized without moving an interference device, and errors caused by mechanical movement are reduced.

This disclosure describes a wearable display system configured to project light to the eye(s) of a user to display virtual (e.g., augmented reality) image content in a vision field of the user. The system can include light source(s) that output light, spatial light modulator(s) that modulate the light to provide the virtual image content, and an eyepiece configured to convey the modulated light toward the eye(s) of the user. The eyepiece can include waveguide(s) and a plurality of in-coupling optical elements arranged on or in the waveguide(s) to in-couple the modulated light received from the spatial light modulator(s) into the waveguide(s) to be guided toward the user's eye(s). The spatial light modulator(s) may be movable, and / or may include movable components, to direct different portions of the modulated light toward different ones of the in-coupling optical elements at different times.

An anamorphic directional illumination device may provide a near-eye display apparatus or a vehicle external light device. The anamorphic near-eye display apparatus comprises a spatial light modulator with asymmetric pixels; an input transverse anamorphic lens; and an extraction waveguide that passes input light in a first direction between a polarization-sensitive reflector and front guide surface to a lateral anamorphic reflector, and to reflect the light back through the extraction waveguide to guide between the rear guide surface and front guide surface. Reflective extraction features are arranged to extract the reflected light towards the pupil of a viewer, maintaining the directionality of the fan of light rays from the spatial light modulator and anamorphic imaging system. A thin, transparent and efficient anamorphic display apparatus for Augmented Reality and Virtual Reality displays and for scene illumination is provided.

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 discloses a high-speed high-resolution compressed sensing imaging system and an imaging method. Light of an object is emitted to the polarization splitting prism to be transmitted and reflected after passing through the first-stage imaging module, the transmitted light is reflected back to the polarization splitting prism after being coded and modulated by the spatial light modulator, and then the transmitted light enters the target surface of the camera through the second-stage imaging module to form a coded imaging image; the reflected light is transmitted to the hollow ridge reflecting prism through the quarter-wave plate, is reflected back to the quarter-wave plate through the hollow ridge reflecting prism, then sequentially passes through the quarter-wave plate, the polarization splitting prism and the secondary imaging module and then enters the target surface of the camera to form a common imaging image, and then coded imaging data is matched with common imaging data; and decoding reconstruction is carried out by adopting an alternating direction multiplier method of a point spread function integrated with the first-stage imaging module and the second-stage imaging module. Compared with a traditional imaging mode, the method can break through the imaging frame rate limit of a camera, and has the advantages of high imaging resolution and small data volume.

Illuminations systems that separate different colors into laterally displaced beams may be used to direct different color image content into an eyepiece for displaying images in the eye. Such an eyepiece may be used, for example, for an augmented reality head mounted display. Illumination systems may be provided that utilize one or more waveguides to direct light from a light source towards a spatial light modulator. Light from the spatial light modulator may be directed towards an eyepiece. Some aspects of the invention provide for light of different colors to be outcoupled at different angles from the one or more waveguides and directed along different beam paths.

The invention discloses a rapid quantitative differential interference microscopy system and method based on holographic recording. The system comprises a partially coherent illumination module, and a microscope objective, a tube lens, a transmission grating, a first linear polarizer, a first thin lens, a half-wave plate, a shading plate, a phase-type spatial light modulator, a second thin lens, a second linear polarizer and an image acquisition module which are sequentially arranged along the optical axis direction of the partially coherent illumination module. According to the invention, the phase-type spatial light modulator is utilized to realize shearing offset in any direction and at any degree, so that the device is suitable for different types of application occasions; the system realizes holographic recording of differential interference by utilizing grating carrier frequency, realizes quantitative differential interference detection on a to-be-detected sample only by utilizing two acquired images, has very high time resolution, spatial resolution and imaging precision, and has a wide application prospect in biological imaging and industrial detection.