330 results about "Gaussian beam" patented technology

The invention provides a thermal wave imaging detection method based on nonlinear frequency modulation microwave excitation induction, and the method comprises the steps: constructing a composite excitation module of Gaussian beam and dynamic phase compensation, decomposing high-frequency / low-frequency sub-pulses for alternate emission, synchronously collecting infrared non-uniform sampling and microwave polarization diversity data, and carrying out the detection of the thermal wave imaging. And through feature fusion of a time domain CNN and a frequency domain graph neural network, propagation parameters are iteratively corrected in combination with a thermal diffusion equation model, and defect and deep structure detection is realized. According to the method, the composite excitation structure is combined with high-frequency / low-frequency sub-pulse alternate emission, the micro-defect detection resolution and the deep structure penetrating capacity are remarkably improved, the feature robustness is enhanced through multi-modal data acquisition and cross-modal neural network fusion, detection depth self-adaptive optimization is achieved through a depth compensation model and Kalman filtering, and the detection precision is improved. The parameter precision is improved with the assistance of a terahertz spectrum coupling matrix and Landweber iterative inversion, and finally an advanced detection system integrating efficient excitation, multi-dimensional perception and intelligent analysis is formed.

The invention discloses a light spot shaping device based on wave plate polarization conversion and a use method, and relates to the technical field of laser processing, the device divides random polarized light into S / P light through a first polarization beam splitter (PBS), converts the S light into P light through a first 1 / 2 wave plate, modulates the S light through a conventional silicon-based liquid crystal spatial light modulator (LCoS SLM), and converts the P light into the S light through a second 1 / 2 wave plate. And the beams are combined by the second PBS. The method comprises the steps of light splitting, polarization conversion, phase modulation, beam combining, beam expanding and focusing and the like. The double 1 / 2 wave plates are combined with the conventional PBS, the laser energy utilization rate is higher than 85%, commercial SLM equipment is adapted, the machining efficiency of the shaped annular light spots is remarkably improved compared with that of Gaussian beams, the method is suitable for laser welding and metal 3D printing, and the problems of energy waste and high cost are solved.

A metasurface lens (2) for shaping a Gaussian beam into a collimated uniform beam, and a design method. The metasurface lens (2) comprises a dielectric substrate layer (203) and a metasurface microstructure. The metasurface microstructure comprises a first metasurface (201) and a second metasurface (202) which are respectively distributed on two sides of the dielectric substrate layer (203), and the first metasurface and the second metasurface each are formed by periodically arranging a plurality of columnar microstructure units. The distribution mode of the columnar microstructure units of the metasurface lens (2) is optimally designed on the basis of irradiance distribution of the Gaussian beam and a target collimated uniform beam, so that emergent beams are parallel to an optical axis and are uniformly distributed in a target range. The metasurface lens (2) implements laser shaping to obtain a target beam; and additionally, the structure is simple, the application range is wide, and the present invention is suitable for laser shaping of various lasers.

The invention is suitable for the technical field of laser processing, and provides laser processing equipment. The laser processing equipment comprises a laser device used for emitting a laser beam; the light path switching system is used for deflecting the laser beam to a flat-topped light path or a Gaussian light path, the laser beam is output in a flat-topped light beam mode through the flat-topped light path, and the laser beam is output in a Gaussian light beam mode through the Gaussian light path; the processing head is used for deflecting the emergent direction of the flat-topped light beam output by the flat-topped light path or the Gaussian light beam output by the Gaussian light path and guiding the flat-topped light beam or the Gaussian light beam to a preset processing position; and the controller is coupled to the light path switching system through communication and is used for controlling the light path switching system to switch the laser beam between the flat-topped light path and the Gaussian light path according to processing requirements. In the embodiment of the invention, the laser processing equipment can be quickly switched among the laser beams in different modes, so that the processing efficiency can be improved.

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

The invention discloses a non-diffraction laser communication terminal based on Bessel beams. The terminal comprises a beacon transmitting module, an optical antenna module, a beacon receiving module, a signal transmitting module, a signal receiving module and a light splitting module. The beacon transmitting module and the signal transmitting module respectively convert the Gaussian beam into a Bessel beam through an axicon, and the Bessel beam is output through a collimating lens; a primary mirror and a secondary mirror of the optical antenna module are mounted in an off-axis manner, so that light beams are shrunk and expanded; the light splitting module completes light path switching and light splitting through a fast reflecting mirror, a 1 / 4 wave plate, a dichroscope and a polarizing beam splitter; the beacon receiving module obtains beacon light position information through a CMOS detector, and the signal receiving module receives signal light through an APD detector. The non-diffraction characteristic of the Bessel beam is utilized, and the off-axis optical antenna and the polarization beam splitting design are combined, so that high-precision and low-loss laser communication is realized.

The embodiment of the invention discloses an etching method, an etching device and a perovskite assembly. The etching method is used for etching a top electrode of a battery to be etched. The etching method comprises the following steps: shaping a Gaussian beam into a square flat-topped beam; adjusting a preset focusing position of the square flat-topped light beam; controlling the to-be-etched battery and the square flat-topped light beam to reach relative positions, and controlling the to-be-etched battery and the square flat-topped light beam to move relatively along a first direction and / or a second direction; and etching the to-be-etched cell according to the preset focusing position, so that the depth of an etching groove formed by etching is greater than or equal to the thickness of the top electrode and less than the sum of the thickness of the top electrode and the thickness of the perovskite functional layer. According to the technical scheme provided by the embodiment of the invention, the Gaussian beam is converted into the square flat-topped beam, and the focal depth lower edge of the generated square flat-topped beam only acts on the top electrode on the surface of the film layer, so that the actual use power is reduced, the influence of laser on other functional layers in the perovskite component can be avoided, and the performance of the perovskite component is improved.

The invention relates to the technical field of optical control, in particular to a micro-nano particle optical control method and device based on circularly polarized light. The invention aims to solve the problem of insufficient flexibility of optical control. The optical control method comprises the following steps: pre-processing micro-nano particles to be controlled; the initial Gaussian beam is processed into a circular polarization tube type beam through a beam shaping module, a light guiding module and a polarization regulation and control module, and the micro-nano particles are irradiated from the position above the gas-liquid interface according to a preset mode; by adjusting the polarization regulation and control module and the light guide module, the motion direction, the motion speed and the stop position of the micro-nano particles are optically controlled. The optical control device comprises a control platform module, a laser emitting module, a light beam shaping module, a light guiding module, a polarization regulation and control module and an imaging monitoring module.

The invention discloses a light spot adjustable optical system, a diffraction optical module and laser processing equipment, and relates to the technical field of precision processing. The optical system comprises a laser, a beam expander, a diffractive optical module and a focusing module which are sequentially arranged in the light path direction, the diffractive optical module comprises at least one diffractive optical element, and the diffractive optical element is manufactured based on a geometric phase liquid crystal polymer birefringent material. The diffractive optical module is used for regulating and controlling light spot characteristic parameters corresponding to a Gaussian beam, the Gaussian beam is emitted by the laser and enters the diffractive optical module after being expanded and collimated by the beam expander, and the light spot characteristic parameters comprise a light spot distribution position and light spot energy intensity. By the adoption of the optical system, laser energy distribution can be optimized, splashing is effectively restrained, and the welding quality and the processing efficiency are improved.

The utility model discloses a light feeding instrument to solve the problem that retina light damage is possibly caused after long-term use in the prior art, and meanwhile, the treatment effect is also improved. Compared with the prior art in which only parameters such as red light source power and emergent light beam size are concerned, the utility model focuses on the important index of irradiance (power density), emergent light is a collimated Gaussian beam and the optical characteristics of eyes (a human eye refraction system is equivalent to a convex lens with a focal length of 17.2 mm). An optical component diffuser is additionally arranged at the position close to the cornea of a user, so that a collimated Gaussian beam is converted into diffused light to enter the eyes of the user, and diffused light spots are formed on the retina, the treatment area is sufficient, energy distribution is uniform, it is ensured that the irradiance is at the expected safety magnitude, and meanwhile the actual treatment effect is ensured.

This invention presents a frequency-domain fluorescence lifetime imaging system, enhancing capabilities with a spatial beam attenuator and pinhole beam splitter. The spatial beam attenuator reshapes any beam into a circular Gaussian beam profile, being compact, cost-effective, with low loss and back reflection. Using digital printing technology, a thin optical film is deposited onto an optical substrate for precise local attenuation of the beam in either transmission or reflection mode. The pinhole beam splitter consists of an optical beam splitter with an active region the size of a pinhole, positioned near the beam's focus, which directs focused light into two paths based on acceptance or rejection by the pinhole. This configuration allows for two detectors to collect photons from both paths concurrently, facilitating dual-mode imaging. Consequently, the system can generate both confocal and conventional non-confocal laser scanning fluorescence lifetime images of the sample at the same time.

The invention provides an unmanned aerial vehicle wireless energy supply method and system based on multiband laser and intelligent tracking and pointing, and relates to the technical field of unmanned aerial vehicle wireless energy transmission. The method comprises the following steps: dynamically selecting a 1064nm or 1550nm laser band according to a real-time distance between the unmanned aerial vehicle and a transmitting end, and shaping a Gaussian beam into a flat-topped beam through a variable-focus collimating lens group; a tracking and aiming mode combining coarse tracking and fine tracking is adopted, in fine tracking, through an infrared beacon and a CCD image servo closed loop, observation noise covariance is dynamically estimated in combination with a Transform-AKF fusion algorithm, and process noise covariance is adjusted in a self-adaptive mode; the offset of the reflection light spots is detected through the reverse reflector to realize jitter compensation; fusing the fine tracking angle and the jitter compensation amount to generate a final aiming instruction; meanwhile, according to energy feedback data and tracking errors of a receiving end, laser output power is adjusted in a self-adaptive mode through a PID algorithm. According to the invention, long-distance, high-precision and self-adaptive unmanned aerial vehicle wireless energy transmission is realized.

The invention discloses a laser cladding method for a wind power sliding bearing, and particularly relates to the technical field of laser cladding. The method comprises the following steps that a wind power gear box pin shaft is fixed to a positioner and adjusted to be axially horizontal, and a laser cladding head is positioned to the position above the central axis of the pin shaft through an industrial robot; laser cladding is conducted in a synchronous powder feeding mode, a cladding head is controlled to horizontally move in the axial direction, meanwhile, a positioner drives a pin shaft to rotate, and a spiral coating is formed on the surface of the pin shaft in a cladding mode; and after single-layer full covering is completed every time, the cladding head is moved reversely to conduct next-layer cladding, coating thickness accumulation is achieved through direction alternation and interlayer superposition, and the technology is terminated till the preset value is reached. By the adoption of the technical scheme, the problem that in the prior art, a sliding bearing is insufficient in friction and wear performance is solved, a flat-topped beam is adopted to replace a traditional Gaussian beam for cladding, the particle size of powder is refined, and the prepared coating has the advantages of being few in crack defect and good in friction and wear performance.

The invention belongs to the technical field of laser, and particularly discloses a beam shaping system and method based on prism pair orthogonality and cascade, and the system comprises a single-mode fiber, an aspherical lens, a first prism pair, a first parallel plate, a second prism pair and a second parallel plate which are sequentially arranged along the direction of an optical axis. A Gaussian beam emitted by a single-mode optical fiber is collimated by an aspherical lens to form a parallel beam, the beam is expanded or compressed in the X direction by a first prism pair, the beam is expanded in the Y direction by a second prism pair, and two inclined parallel plates are respectively used for compensating the beam offset in the X / Y direction; according to the invention, the circular Gaussian beam emitted by the single-mode fiber can be shaped, a large strip-shaped collimation light spot with an adjustable length-width ratio from 4: 1 to 20: 1 and a long axis size of 30mm can be realized, and the central positions of the input and output beams in the cross section are ensured to be unchanged.

The invention relates to a preparation method of an entangled light source based on a grating and a perfect vortex metasurface, and the method comprises the steps: providing a Gaussian beam, carrying out the linear polarization of the Gaussian beam in a specific polarization direction, and generating signal light and idle light through a periodically poled potassium titanate crystal; after the photons are collimated, the polarization states of the signal light and the idle light are changed through a 1 / 4 wave plate, and the signal light and the idle light are respectively converted into right-handed circular polarization and left-handed circular polarization; the Gaussian beam passes through the perfect vortex metasurface to obtain a geometric phase changing along with space; through the one-dimensional grating, the left-handed perfect vortex light and the right-handed perfect vortex light are separated to output an overlapped part entangled state; and respectively coupling the photons in the two paths into an optical fiber, and transmitting the photons to a single-photon detector to record a coincidence number.

The invention provides a nonlinear refractive index measurement system and method based on dual-optical-path interference, and relates to the technical field of nonlinear optical measurement, the system comprises a first laser emission unit, a first light splitting device, a second light splitting device, an interference device, a to-be-measured sample, a second laser emission unit and a measurement unit; the first laser emission unit generates a Gaussian beam; the first light splitting device splits the Gaussian beam into a sample beam and a reference beam which are parallel to each other; the second light splitting device splits the sample light beam and the reference light beam which are parallel to each other into two paths; the first sample light beam and the reference light beam enter a to-be-tested sample; the second laser emission unit generates a pumping light beam, and the pumping light beam is emitted to the sample to be measured along the light path of the first sample light beam; the interference device generates interference between the two sample light beams and interference between the two reference light beams; the measuring unit is used for collecting interference images, analyzing the interference images and calculating the nonlinear refractive index of the to-be-measured sample. The system is not easily influenced by the environment.

To prevent the processing quality from deteriorating even when a center position of an optical element changes in the middle of processing by correcting the center position of the optical element in realtime.SOLUTION: A control unit 11 of a laser beam machine 1 detects a maximal value and a minimal value of optical strength from an optical strength distribution of a ring beam detected by a detection unit 7, detects a direction in which the maximal value has been detected from the center of the optical strength distribution of the ring beam, as a change direction along which the center position of an optical element has changed, calculates a ratio of the detected maximal value and minimal value as an optical strength ratio of the ring beam, divides the optical strength distribution of a Gaussian beam stored in a storage unit 9 by a distance from the beam center of the Gaussian beam into two regions, calculates a distance at which a ratio of the two divided regions matches the optical strength ratio of the ring beam, as a change amount by which the center position of the optical element has changed, and makes corrections so that the center position of the optical element coincides with the beam center of the Gaussian beam on the basis of the change amount and the change direction.SELECTED DRAWING: Figure 1

The invention relates to the technical field of optical systems, in particular to a micro-nano particle self-assembly and optical control method and device based on a vector light field. The purpose of the invention is to improve the precision of controlling the micro-nano particles. The first purpose is to provide a micro-nano particle self-assembly and optical control method based on a vector light field, and the method comprises the steps: carrying out the combined regulation and control of the orbital angular momentum and polarization state of a linear polarization Gaussian beam through a light field regulation and control assembly, so as to enable the linear polarization Gaussian beam to be converted into a high-order Poincare vector light field with a spatial polarization distribution characteristic; the vector light field is collimated, reflected and focused through the light guiding assembly, so that the vector light field acts on the micro-nano particles, and the micro-nano particles are self-assembled to form a self-assembled structure; and the rotation direction and the rotation speed of the self-assembly structure are regulated and controlled through the light field regulation and control assembly. The second purpose is to provide a micro-nano particle self-assembly and optical control system based on a vector light field.

The invention relates to a laser beam imaging method and system based on a bifocal optical system, and the method comprises the steps: enabling a first group of Laguerre-Gaussian beams with specified wavelength values to pass through the bifocal optical system, and recording a plurality of wavelength values and focus positions corresponding to the wavelength values; a focus prediction model is constructed and trained, and parameters of the focus prediction model are adjusted to meet preset requirements; predicting focus positions of the second group of light beams with specified wavelength values passing through the bifocal optical system through a focus prediction model, and constructing a mapping table of wavelength values and corresponding intersection point positions; obtaining a target imaging position, calculating a focus position based on the target imaging position, calling a mapping table based on the wavelength value and the corresponding intersection point position, and extracting the wavelength of the Laguerre-Gaussian beam corresponding to the focus position; and the Laguerre-Gaussian beam with the wavelength obtained through calculation is emitted, and an image of a target position is obtained through a bifocal optical system. According to the process, the adjusting efficiency is improved while the imaging quality of the bifocal optical system is improved.

According to the vector vortex beam generation method applied to the SERF magnetic field measurement device, a vector vortex beam is generated according to a light field distribution formula of the vortex beam in combination with a computer-generated holography method and a polarization mode decomposition method, then iterative optimization is carried out on parameters such as the phase, the amplitude and the polarization direction in the beam in a global NSGA-II algorithm and local SPGD algorithm combination mode, and finally the vector vortex beam is generated. And then judging whether the electron steady-state polarizability uniformity meets the expectation or not, if so, ending the optimization, taking the optimized light beam as a pumping light beam to pump alkali metal atoms, and carrying out subsequent magnetic field measurement, and if not, changing parameters and continuing optimization until the electron steady-state polarizability uniformity meets the expectation. Compared with a traditional Gaussian beam, the atomic polarizability in the air chamber is stabilized at a required value, the atomic spin gradient field of the device is effectively inhibited, the differential performance of the device is enhanced, and the sensitivity of the SERF magnetic field measurement device is improved.

This application provides a multi-parameter Gaussian beam inversion imaging method, apparatus, and device for acoustic VTI media, belonging to the field of seismic data processing technology. Based on normal time-difference correction velocity parameters, non-elliptic parameters, and Thomsen parameters, the pressure wave field control equation in the acoustic VTI medium is parameterized to obtain a migration operator. Based on the migration operator, the acquired actual seismic data is migrated to obtain actual migration imaging results. Based on the migration operator, the difference between the forward-modeled seismic data containing and without point scatterers is migrated to obtain a point spread function. The point spread function is spatially convolved with the initial perturbation parameter model to obtain simulated migration imaging results. Based on the actual and simulated migration imaging results, a first model loss is determined. The initial perturbation parameter model is iterated with the goal of minimizing the first model loss, improving the stability of imaging and parameter estimation in weakly illuminated areas.

The application discloses a three-piece Bessel beam shaping system with a diffraction ring, and belongs to the technical field of laser processing, comprising: a beam shaping mirror, a first collimating mirror and a focusing mirror; the incident surface and the exit surface of the beam shaping mirror are annular planes and annular aspheric surfaces respectively, and are used for shaping a collimated Gaussian beam into a point annular beam with energy gradually decreasing from inside to outside; the incident surface and the exit surface of the first collimating mirror are annular aspheric surfaces and annular planes respectively, and are used for collimating the point annular beam; the incident surface of the focusing mirror is a combination of an axicon surface and a spherical surface, and the exit surface is a plane; the focusing mirror is used for focusing the collimated point annular beam into a Bessel beam with a diffraction ring. The application can significantly improve the focal depth of the Bessel beam in laser processing, and can also effectively remove processing materials such as ink. In addition, the focal depth of the Bessel beam in the application is adjustable, and the adjustment mode is more, the flexibility is higher, and is suitable for different laser processing scenes.

The application provides a free space optical transmission system and simulation method based on a space-time non-diffracting light beam, and relates to the technical field of free space optical transmission.The system comprises a transmitting end configured to generate a laser light beam, modulate the laser light beam, perform collimation processing to form a Gaussian light beam, and convert the Gaussian light beam into a non-diffracting space-time light beam; and a receiving end configured to receive the non-diffracting space-time light beam, perform photoelectric conversion and signal restoration on the non-diffracting space-time light beam, and obtain original digital information; wherein the non-diffracting space-time light beam is a non-diffracting light beam with mutual correlation in time and space dimensions.The non-diffracting space-time light beam can reduce the influence of atmospheric turbulence, transceiver misalignment and limited aperture on a communication link, and effectively improve the transmission performance of the free space optical transmission system in a complex environment.

The invention discloses a free space optical communication system based on a structured optical frequency comb, and belongs to the field of optical communication. Comprising an optical frequency comb generation system, a signal coding system, a spatial light modulation and demodulation system and a signal receiving system. The optical frequency comb generation system is used for modulating input continuous laser into an adjustable optical frequency comb with high repetition frequency, short pulse width and high power; the signal coding system is used for separating the light with different wavelengths in the optical frequency comb, independently coding the light with each wavelength, and finally combining the light with different wavelengths again; the spatial light modulation and demodulation system is used for coupling the Gaussian beam in the optical fiber into a free space and converting the Gaussian beam into structured light, demodulating the structured light after the structured light is transmitted to a receiving end and re-coupling the structured light back to the optical fiber; the signal receiving system is used for receiving and analyzing the optical signals. According to the invention, the optical frequency comb and the structured light are combined, and the problem that optical signals are easily influenced by atmospheric turbulence in free space optical communication can be effectively solved on the premise of ensuring large communication capacity.

The invention relates to the technical field of image recognition and search, and discloses a surveying and mapping device capable of automatically searching a target, which comprises a base, surveying and mapping equipment is arranged at the top of the base, a searching mechanism is arranged at the top of the surveying and mapping equipment, the searching mechanism comprises a supporting block, and the supporting block is fixedly connected to the front side of the top of the surveying and mapping equipment. A semiconductor laser is installed on the left side of the supporting block, an emission lens is fixedly connected to the right side of the supporting block, and a fixing plate is fixedly connected to the right side of the top of the surveying and mapping device. According to the invention, the transmitting lens is matched with the transmitting cylindrical mirror, an elliptical Gaussian beam emitted by the semiconductor laser is converted into a fan-shaped line light source with uniform energy distribution by adopting a means of combining slow axis collimation and fast axis beam expansion, and a specified search angle is covered; the problems of non-uniform divergence of the infrared light source in the vertical direction and low light energy utilization rate in the prior art are avoided.

The invention provides a laser fuze emission beam-expanding optical lens in an extremely simple form, and the optical lens comprises an emission lens which is located at the rear end of the lens and is used for carrying out the small-angle compression shaping of a beam divergence angle of a meridian-direction Gaussian beam emitted by a laser; and the wave mirror is positioned at the front end of the lens and is used for carrying out large-angle beam expansion on the beam divergence angle of the Gaussian beam emitted by the laser in the sagittal direction and realizing uniform shaping of light spots. Strip-shaped distribution shaping is carried out on Gaussian beams of the laser through the extremely simple form of the two lenses, so that the light beam emergent view field in one direction, namely the meridian direction, is compressed to 1 degree, and the light beam emergent view field in the other vertical direction, namely the sagittal direction, is expanded to 90 degrees. By adopting the special element design of the cylindrical surface array, the uniform energy distribution of the whole strip-shaped light spot is realized, the target detection precision of the surface-air laser fuze in a large-range space region is greatly improved, and meanwhile, the extremely simple design is more beneficial to meeting the requirements of miniaturization and low cost.

Methods and devices relating to volumetric meta-optic structures. A method involves computationally designing a three-dimensional refractive index profile using an adjoint-based optimization process. The process optimizes for sorting light based on wavelength or polarization at specific oblique incidence angles and accounts for source divergence using Gaussian beam simulations. A mode overlap figure of merit is employed, optionally including terms to minimize crosstalk. Fabrication constraints like material binarization and minimum feature size are handled via differentiable filters. Physical crosstalk barriers may optionally be modeled during optimization. The resulting optimized profile defines a manufacturable multi-layer structure comprising patterned dielectric materials configured to perform the target sorting function efficiently under the specified oblique angle conditions. An array of such devices, potentially comprising structurally distinct elements optimized for different angles, can be integrated with an image sensor.

The invention relates to a method and system for measuring the lateral velocity of a target based on composite modulation of polarization and orbital angular momentum, and belongs to the field of laser velocity measurement. The invention aims to solve the problem that existing laser lateral velocity measurement methods and technologies cannot accurately measure the lateral velocity of a moving target in atmospheric turbulence and determine the direction of the velocity. The method of the invention comprises the following steps: S1. Modulating a laser signal to generate a dual-mode vortex beam with 1st and 4th order superposition, compositely modulating the laser signal with polarization and orbital angular momentum with a Gaussian beam to generate a modulation signal, and irradiating the target object with atmospheric turbulence to generate an echo signal; S2. Using a wavefront sensor to obtain the distorted phase of the polarization component of the Gaussian beam, generating a compensation phase to perform phase correction on the dual-mode vortex beam; S3. Using an array detector to detect the polarization component of the dual-mode vortex beam after phase compensation correction, the polarization component of the dual-mode vortex beam is used to obtain three lateral Doppler effect spot areas of the echo light field, which are then detected and calculated by the array detector to determine the magnitude and direction of the lateral velocity of the moving target.

The embodiment of the invention provides a beam decomposition method for electromagnetic acceleration calculation of an electrically large-sized target, and the method comprises the steps: 1, obtaining a sampling data file, and converting the related parameter information when a read antenna pattern is represented by a uniform sampling grid into a data organization form capable of carrying out query processing; 2, performing uniform sampling on a spherical surface through a gold spiral method, and determining a sub-beam center; 3, limiting a Gaussian beam edge amplitude attenuation threshold value, calculating a beam variance as a limiting condition, and controlling the shape width of the Gaussian beam to be used; and 4, completing high-fidelity beam decomposition of the directional diagram by adopting local convolution, amplitude alignment and phase cloning operation, and ensuring that each sub-beam strictly inherits original field characteristics. According to the method, distributed parallel computing of a complex scattering problem is realized through a conical beam decomposition and region mapping mechanism, and the computing efficiency is remarkably improved while the computing precision is ensured.

The present invention provides a filamentation cutting head, a laser cutting system and a design method for a filamentation cutting head, which relate to the field of laser control technology. The filamentation cutting head includes a shaping element, a collimating element and a focusing element arranged in sequence along the propagation direction of light. The laser beam emitted by the laser is converted into a flat-top beam by a shaping element having a first surface shape, and its divergence angle is controlled by the collimation of the collimating element. Finally, it is converged into a target filamentation beam with high energy utilization and high uniformity by a focusing element having a second surface shape. This filamentation beam can realize laser cutting of hard and brittle materials and improve the processing effect. At the same time, the filamentation cutting head adopts a full-refractive element, which not only has the advantages of a simple design method, low lens processing difficulty, and the ability to cope with a variety of materials, but can also convert all Gaussian beams into flat-top beams, so that all input energy is utilized in the filamentation beam.