87 results about "Tophat beam" patented technology

The invention discloses a method for generating a flat-topped beam array, and the method comprises the steps: introducing a multi-Gaussian function and a hyperbolic function, carrying out the superposition of the hyperbolic function, and constructing a weighting function and a kernel function with Gaussian distribution intensity based on the superposed hyperbolic function and multi-Gaussian function; introducing a partially coherent light construction formula, and constructing a cross spectral density function of a multi-cosine multi-Gaussian correlation light field containing a multi-cosine function at a source plane by combining a weighting function and a kernel function; introducing a free space transmission formula, and constructing a light intensity expression of the multi-cosine multi-Gaussian correlation light field at any transmission distance according to a cross spectral density function of the multi-cosine multi-Gaussian correlation light field, namely, an expression of the multi-cosine multi-Gaussian correlation light field; adjusting parameters of the transmission distance and the multi-cosine multi-Gaussian correlation light field to obtain flat-topped beam arrays with different row numbers and column numbers, and realizing an array form with adjustable flat-topped sub-beams; according to the invention, the number of the sub-beams of the flat-topped beam array can be effectively regulated and controlled.

The invention discloses a method for regulating and controlling a cosine multi-Gaussian correlation structure light field, and the method comprises the steps: introducing a hyperbolic cosine function and a multi-Gaussian function, and constructing a weighting function and a kernel function based on the hyperbolic cosine function and the multi-Gaussian function; introducing a partially coherent light construction formula, and constructing a cross spectral density function of a cosine multi-Gaussian correlation structure light field at the source plane by combining a weighting function and a kernel function; introducing a free space transmission formula, and constructing a light intensity expression of a cosine multi-Gaussian correlation structure light field at any transmission distance according to a cross spectral density function, namely, an expression of the cosine multi-Gaussian correlation structure light field; adjusting the transmission distance and parameters of the cosine multi-Gaussian correlation structure light field to obtain light intensity distribution regulation and control of the cosine multi-Gaussian correlation structure light field, and further obtaining an array form in which sub-beams are flat-topped beams according to the light intensity distribution regulation and control; according to the invention, controllable transmission of the cosine multi-Gaussian correlation structure light field can be realized, and effective regulation and control of the array form in which the sub-beams are flat-topped beams can be realized.

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 relates to the technical field of optical fiber device manufacturing, and discloses a femtosecond laser inscribing low-polarization-dependent-loss optical fiber grating method and system, and the method comprises the steps: firstly, synthesizing an initial phase comprising a flat-topped beam phase, an astigmatism correction phase and a defocus phase, and loading the initial phase to a spatial light phase modulator; therefore, a preset circular flat-top focusing light spot is generated. Secondly, collecting a three-dimensional light field image sequence of a focusing light spot in a low-power detection mode, reconstructing light intensity distribution, extracting effective focal depth and ovality characteristic parameters, dynamically optimizing a phase through a closed-loop feedback mechanism until light field characteristics reach a preset target, and obtaining an optimized phase; and finally, loading an optimized phase in a high-power inscribing mode, and controlling the axial scanning of the optical fiber to inscribe the grating. Accurate active regulation and control of the three-dimensional shape of the focused light field and closed-loop self-optimization of process parameters are realized, birefringence caused by anisotropy of a refractive index modulation area is inhibited from a physical mechanism, and polarization dependent loss of the fiber bragg grating is fundamentally reduced.

The invention relates to the technical field of laser beam shaping, discloses an active test method and system for a circuit breaker, and is used for solving the problem that the self-adaptive shaping capability of a CO2 laser beam is difficult to improve by the existing method. Firstly, a stable light path is constructed, and the stability of the light path is ensured through mechanical limiting, a thermal management module and multi-stage optical alignment; then low-power calibration is carried out, a deformable mirror initial driving table is generated through a least square inversion algorithm, and a flat-topped beam reference is established; data are collected through a wavefront sensor, a high-order mode is reconstructed, the voltage of a deformable mirror is dynamically refreshed, and wavefront control and scanning motion synchronization is ensured in combination with scanning galvanometer time sequence synchronization, closed-loop control and exception handling; monitoring the temperature of the deformable mirror, starting water-cooling adjustment, and correcting the driving table to cope with the heat effect; finally, a safety system is constructed, laser power, wavefront distortion and deformable mirror stroke parameters are monitored, dry gas purging is conducted on the diffractive optical element regularly, and safety guarantee and performance verification of the whole process are achieved.

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 relates to a dynamic light beam shaping system and method based on a spatial light modulator. The system comprises a laser light source module, a beam expanding collimation light path, a light beam modulator, a focusing optical assembly, a detection and feedback module and a control and optimization module. According to the method, the uniformity of the output flat-topped beam can be corrected by virtue of a random parallel gradient descent (SPGD) algorithm and combining a Zernike polynomial as a control variable. Meanwhile, a composite performance index comprehensively considering energy distribution and shape features is constructed, the correction process of the flat-topped beam is accelerated by adopting a mode of gradually improving Zernike polynomial orders in multiple stages, the convergence trend of the performance index is used as a judgment basis of stage switching, stage independent variable dimension expansion is implemented, and the correction precision of the flat-topped beam is improved. And the convergence speed is obviously improved. Besides, adaptive selection of disturbance amplitude and learning rate parameters in the SPGD algorithm is realized by using noise estimation and a local linearity index, and the robustness of the system to noise and environmental disturbance is enhanced.

The invention discloses a double-flat-topped light beam diamond polishing device and method based on homogenized optical fibers, and relates to the technical field of semiconductor material laser processing. The light spot homogenizing unit homogenizes the pulse laser to obtain a square flat-topped light spot; the light spot shaping unit collimates the homogenized pulse laser into parallel light and adjusts the beam diameter; the beam splitting and sub-transfer unit splits the parallel light into two sub-light beams, the two sub-light beams are adjusted to be coplanar and parallel to each other, and the center-to-center distance between the two sub-light beams is adjustable; the laser processing head unit focuses the two sub-light beams on the surface of the diamond; and the three-dimensional motion platform is used for bearing the diamond and scanning and polishing the diamond. Multi-focus array parallel scanning increases the coverage area of single-time processing, the processing effect of traditional single-focus multi-time scanning can be achieved through one-time scanning, the scanning frequency is remarkably reduced, the processing time consumption is reduced, and the processing efficiency is improved.

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.

The invention relates to the technical field of lasers, in particular to a multi-wavelength coaxial line polarization homogenization laser system which comprises a laser light source, a collimation module, a coaxial beam combination module and a homogenization module. The laser light source is used for outputting a plurality of linearly polarized lasers; the collimation module is used for matching the laser spot to collimated laser with a target size; the coaxial beam combining module is used for integrating the multi-wavelength laser to the same light path and enabling the coaxiality to be smaller than or equal to 0.01 mrad; the homogenizing module comprises an aspheric lens, an aspheric mirror, a concave-convex lens and a biconvex lens, the aspheric lens is used for expanding the light beams, and the aspheric mirror, the concave-convex lens and the biconvex lens are used for converting the Gaussian light beams into uniform flat-topped light beams, so that the homogenizing module eliminates multi-wavelength dispersion and outputs coaxial laser beams with the light intensity uniformity larger than or equal to 90%. According to the multi-wavelength coaxial line polarization homogenization laser system, the multi-wavelength coaxiality and the light intensity uniformity can be improved, and meanwhile, the complexity of the laser system is reduced.

The invention discloses a laser illumination and imaging lens group for a shadow imaging system, the laser illumination and imaging lens group comprises an illumination lens and an imaging lens, the illumination lens shapes a Gaussian beam into a flat-topped beam, and the flat-topped beam uniformly irradiates an object to be observed; the imaging lens images the target area to obtain a shadow contour image of the observed object. The illumination lens comprises a first lens with negative focal power and a second lens with positive focal power, and the first lens and the second lens are both aspheric lenses. The imaging lens comprises a front lens group, an aperture diaphragm and a rear lens group, the front lens group comprises a third lens, a fourth lens, a seventh lens and an eighth lens with positive focal power, and a fifth lens and a sixth lens with negative focal power, and the rear lens group comprises a ninth lens with negative focal power and a tenth lens with positive focal power. And all the lenses are spherical lenses. While the collimation and dodging effects of the laser beams are ensured, the system also has the advantages of long working distance, high resolution and the like, can meet the observation requirements of a non-luminous high-speed small-size moving object, and expands the application field of a shadow imaging system.

The present application belongs to the field of optical devices and proposes a collimated flat-top Gaussian beam converter, comprising: a beam expansion lens group, a polygonal gradient refractive index lens array, an aspheric focusing lens, a polygonal gradient refractive index fiber image transmission bundle, and a collimating element; the beam expansion lens group is used to expand and collimate the incident light, and the expanded and collimated light is incident on the polygonal gradient refractive index lens array. The light output from the polygonal gradient refractive index lens array is focused onto the image-side focal plane of the aspheric focusing lens after passing through the aspheric focusing lens; one end face of the polygonal gradient refractive index fiber image transmission bundle is placed at the image-side focal plane of the aspheric focusing lens, and the other end is placed at the object-side focal plane of the collimating lens. The collimated flat-top beam converter of the present application is capable of converting a non-uniform Gaussian beam emitted by a light source into a flat-top beam, thereby improving the uniformity of light energy distribution in the exposure area and overcoming the defect that the working spot of a traditional Gaussian beam is bright in the center and dark at the edges.

The invention discloses equipment and a method for measuring the length of a high-speed rotating blade. The method comprises the following steps: acquiring a collimated Gaussian beam through a light source collimation module; converting the collimated Gaussian beam into a flat-topped beam with uniformly distributed intensity through a collimation and homogenization converter; a blade tip detection light path of the to-be-detected workpiece is obtained through a light beam reflection module according to the symmetrically arranged light beam reflection ends; the blade tip detection light path comprises a light path of incident light obtained by carrying out light path direction conversion on the flat-topped light beam; performing straight edge diffraction on the blade tip edge of the to-be-detected workpiece through the incident light to obtain a light path of diffracted light containing blade tip size information of the to-be-detected workpiece; a light beam receiving and demodulating end is used for receiving and demodulating diffraction fringe intensity distribution of diffraction light containing blade tip size information so as to reconstruct blade length parameters of a to-be-detected workpiece. According to the invention, the problems of poor light beam collimation, poor light spot uniformity and poor blade tip measurement precision existing in the actual use of the existing measuring instrument are solved.

The invention discloses shaping laser annealing equipment and method for a silicon-based heterojunction cell, and the equipment comprises a laser, a light path and a quick connection assembly, the output end of the laser is fixedly connected with the light path, and the light path is fixedly connected with a beam expander. The diffraction optical element can be taken out during later maintenance, and maintenance is simple and convenient; during machining, the light path is adjusted, laser emitted by the laser can pass through the center of the diffraction optical element reflector, the diffraction optical element in the light path enables machining plane light spots to be distributed in a flat-topped light beam energy mode, the flat-topped light beam energy is concentrated, energy loss is reduced, ablation damage caused by too high local energy is avoided, and machining precision is improved. The resistivity is generally reduced after processing, optimal processing parameters exist, the resistivity is reduced by about 25% on the basis that the substrate and the transparent conductive film layer are not damaged by the shaping laser annealing process, and the processing efficiency and the annealing quality of the heterojunction cell are effectively improved.

The invention discloses a Gaussian beam shaping rod mirror optimization method. The method comprises the following steps: S1, calculating the spatial distribution of laser beams through ray tracing; s2, according to the physical model of the flat-topped light beam, deriving a mapping function relational expression of any light on an incident plane and an emergent plane, and constructing an optimization algorithm evaluation function; s3, performing optimization design on the optical structure of the rod mirror shaping system through a particle swarm optimization algorithm; and S4, evaluating the machinability of the rod mirror shaping system by using tolerance analysis. The processing feasibility of the optical element can be determined, the stability of the shaping system is improved, the design difficulty of the beam shaping system is reduced, and a better beam shaping effect and a higher energy utilization rate are realized.

The invention relates to the field of atomic interference measurement, in particular to an atomic Raman interferometer based on a flat-topped beam. Comprising two Raman interference subsystems arranged in parallel, each of the two Raman interference subsystems comprises an ultrahigh vacuum cavity and a light path system, and the light path system comprises a flat-topped beam shaping module located on one side of the high vacuum cavity and a Raman light Doppler sensitive configuration module located on the other side of the high vacuum cavity; in the flat-topped beam shaping module, the holographic algorithm principle is adopted, the actual size of atoms in an interference area is combined to determine the size of a target flat-topped beam, the initial complex amplitude is precisely constrained, and a final diffraction phase is obtained through iterative optimization. After the Raman light passes through the diffraction phase, the Raman light is shaped into a flat-topped light beam with a target size and uniform intensity distribution at the ultrahigh vacuum cavity, so that the coherence efficiency under the same interference time is remarkably improved.

The invention relates to a laser beam shaping system. The laser beam shaping system comprises a laser light source used for generating an initial light beam; the aspherical lens group is arranged on a propagation path of the laser beam and comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from the object space to the image space along the incident direction of the light source; wherein the first lens and the second lens are plano-concave aspheric lenses and both have negative focal lengths; the third lens is a biconcave aspheric lens and has a negative focal length; the fourth lens is a biconvex aspheric lens and has a positive focal length; the initial light beam is collimated by the lens group to form a target flat-topped light beam, and meanwhile, the aperture of the light beam realizes beam expansion of a preset multiplying power.

The invention provides an optical device and a laser. The optical device comprises a first light splitting module, N light beam shaping modules and N second light splitting modules, n is a natural number greater than or equal to 2; the first light splitting module receives an input light beam and splits the input light beam into N Gaussian light beams in a time domain; the light beam shaping modules are arranged on the light emitting side of the first light splitting module, correspond to the Gaussian light beams one to one and convert the Gaussian light beams output by the first light splitting module into flat-topped light beams; the second light splitting modules are arranged on the light emitting side of the light beam shaping module, correspond to the flat-topped light beams in a one-to-one mode and divide the flat-topped light beams into at least two beams of output light in the spatial domain. According to the optical device and the laser, the high-energy requirement and the high-repetition-rate requirement of precision machining are met, and the productivity is greatly improved; the light beams segmented in time can be independently controlled, and the flexibility is greatly improved.

The application discloses a method for generating a flat-top beam array, comprising the following steps: introducing a multi-Gaussian function and a hyperbolic function, superimposing the hyperbolic function, constructing a weight function and a kernel function with Gaussian distribution intensity based on the superimposed hyperbolic function and the multi-Gaussian function; introducing a partial coherent light construction formula, combining the weight function and the kernel function to obtain a cross-spectral density function of a multi-cosine multi-Gaussian correlation light field containing a multi-cosine function at a source plane; introducing a free space transmission formula, constructing an intensity expression of the multi-cosine multi-Gaussian correlation light field at an arbitrary transmission distance according to the cross-spectral density function of the multi-cosine multi-Gaussian correlation light field, that is, an expression of the multi-cosine multi-Gaussian correlation light field; adjusting the transmission distance and the parameters of the multi-cosine multi-Gaussian correlation light field to obtain a flat-top beam array with different numbers of rows and columns, and realizing an array form with adjustable flat-top sub-beams; and the application can effectively control the number of the flat-top beam array sub-beams.

The invention discloses a femtosecond laser operation flat-topped beam shaping optical system which comprises a laser, a beam expander, a DOE shaping module and a focusing scanning module. The laser is used for outputting a femtosecond Gaussian laser beam, and the femtosecond Gaussian laser beam sequentially passes through the beam expander, the DOE shaping module and the focusing scanning module and then acts on an operation area; the beam expander is used for expanding the diameter of the femtosecond Gaussian laser beam to the beam diameter used for cutting the light path; the DOE shaping module comprises a DOE diffractive optical element; the DOE diffractive optical element is arranged on a path of the femtosecond Gaussian laser beam and is used for converting an incident Gaussian beam into a flat-topped beam with uniformly distributed energy through phase modulation; the flat-topped light beam has no local energy peak value, thermal damage and excessive ionization of traditional Gaussian laser to normal tissues of eyes are avoided, postoperative inflammatory response is light, the tissue recovery speed is increased, and the risk of operative complications is reduced.

The present invention relates to a method for constructing a dual-mode coherent synthesis laser and an additive manufacturing method, comprising: generating and synchronizing a pulse seed laser and a continuous seed laser; obtaining a pulse laser and a continuous laser; S3, synchronizing the phases of the pulse laser and the continuous laser to reach a phase-locked state, and then combining the beams to form a coherent synthesis laser; S4, performing phase compensation and optical path difference adjustment on the coherent synthesis laser to obtain a high-quality coherent synthesis laser; S5, shaping the coherent synthesis laser and the auxiliary oscillator laser into a flat-top beam, which is then further shaped into a flat-top ring coherent synthesis laser and a flat-top ring oscillator laser, wherein the flat-top ring oscillator laser can be switched between coaxial and paraxial. The method combines the advantages of stable continuous laser energy output with the advantages of a small heat-affected zone and low reflection of a pulsed laser, and has high precision and high efficiency in the additive manufacturing process, excellent mechanical properties of parts at the macro level, and uniform part structure at the micro level.

In one aspect, the present teachings provide a system for performing cytometry that can be operated in three operational modes. In one operational mode, a fluorescence image of a sample is obtained by exciting one or more fluorophore(s) present in the sample by an excitation beam formed as a superposition of a top-hat-shaped beam with a plurality of beams that are radiofrequency shifted relative to one another. In another operational mode, a sample can be illuminated successively over a time interval by a laser beam at a plurality of excitation frequencies in a scanning fashion. In yet another operational mode, the system can be operated to illuminate a plurality of locations of a sample concurrently by a single excitation frequency, which can be generated, e.g., by shifting the central frequency of a laser beam by a radiofrequency. The detected fluorescence radiation can be used to analyze the fluorescence content of the sample, e.g., a cell / particle.

The invention provides an optical system for reducing optical noise, which is used in the field of laser gas analyzers, and comprises a doublet collimating lens, the doublet collimating lens is arranged on an emission light path of an infrared laser light source, the doublet collimating lens is used for shaping a laser beam emitted by the infrared laser light source, and the doublet collimating lens is used for outputting the shaped laser beam. And the obtained laser collimated light beam is a nearly flat-topped light beam with uniform energy, is freely propagated in the space and is received by a receiving end. According to the invention, a single-piece doublet lens is used as a core optical element, the free light laser beam of TO packaging is shaped to realize laser beam homogenization and collimation, the introduction of intensity noise caused by non-uniform light intensity distribution of the light beam after long-distance light beam transmission is reduced, and the optical interference noise frequency is increased in combination with the long-focal-length light path design, so that the optical interference efficiency is improved. The influence of optical interference noise is reduced through a filtering algorithm. And the structure is compact, the installation and adjustment are simple and convenient, the environmental adaptability is strong, and the application effect of the laser gas analyzer in the gas detection field is realized.

The invention provides a trace element LIBS dynamic monitoring device and method based on a flat-topped beam, and belongs to the technical field of laser beam shaping and laser-induced breakdown spectroscopy, and the trace element LIBS dynamic monitoring device comprises a laser emission unit used for generating a pulse-type Gaussian distribution laser beam; the light beam shaping and focusing unit is composed of an aspherical lens group based on a Galileo structure, and is used for shaping the incident Gaussian distribution laser beam into a flat-topped light beam with uniformly distributed energy on an image plane, and focusing the flat-topped light beam into a light spot; the sample chamber is used for containing a lubricating oil sample to be detected; the spectral signal acquisition unit is used for collecting and transmitting spectral signals generated by plasma radiation; and the control and data processing unit is used for processing data and controlling dynamic monitoring. According to the invention, the Gaussian beam is shaped into the flat-topped beam through the aspheric lens group and is focused, so that the stability and quantitative precision of LIBS (Laser-induced Breakdown Spectroscopy) detection are improved.

This invention discloses an apparatus and method for achieving a high-contrast CPT resonance signal. The apparatus includes a coherent light source generation module, a beam quality optimization module, a beam parameter optimization module, an atomic gas cell module, an optical detection and acquisition module, a laser frequency stabilization module, and a signal generator. The coherent light source generation module generates coherent two-color light with an energy distribution satisfying a Gaussian distribution. The beam quality optimization module converts the Gaussian beam into a flat-top beam. The beam parameter optimization module optimizes the parameters of the flat-top beam. The atomic gas cell module enables the beam to interact with atoms, obtaining an atomic superposition absorption spectrum. The optical detection and acquisition module detects the optical signal and converts it into an electrical signal. The laser frequency stabilization module locks the laser frequency to the lowest point of the atomic superposition absorption spectrum. The signal generator linearly scans the radio frequency signal, causing the frequency difference of the coherent two-color light to change linearly, outputting a high-contrast CPT resonance signal. This invention can effectively improve the contrast of the CPT resonance signal.

The present application relates to the technical field of laser welding, in particular to a kind of welding beam light intensity adjusting method, device and laser welding machine.The method comprises: identifying the processing surface of target product and its processing track;For each processing track, generate Gaussian beam and preheat at the starting point of the processing track;Determine the first region and monitor its temperature;Judge whether the temperature of the first region reaches the preset temperature, if yes, switch Gaussian beam to flat-top beam and move along the processing track to process the target product;Before flat-top beam moves, determine the second region and third region;When flat-top beam moves, the second region and third region are updated in real time, and the light intensity of flat-top beam acting on the target product is adjusted according to the temperature change of the second region and third region.The present application solves the problem that laser welding machine cannot self-adjust the light intensity of laser.

The invention discloses a transmitting-receiving common-path homogenizing optical system for a miniaturized laser measuring and illuminating device, which relates to the technical field of laser measuring and illuminating and comprises a laser transmitting system and a laser receiving system. The laser emission system is used for reflecting an incident Gaussian beam downwards through a plane mirror, reflecting the incident Gaussian beam rightwards through a beam splitter prism, enabling the incident Gaussian beam to enter the Galileo beam expanding and collimating subsystem for beam expanding and collimating, shaping the incident Gaussian beam into a flat-topped beam through an aspherical lens group, and emitting the flat-topped beam; and the laser receiving system is used for reversely transmitting a laser echo signal reflected by a target through an aspherical lens group and a Galileo beam-expanding collimating lens group, transmitting the laser echo signal through a beam splitter prism, filtering stray light through a narrow-band optical filter, and converging the laser echo signal to an avalanche photoelectric detector through a receiving aspherical lens. According to the invention, the ranging precision is improved structurally, the system structure is simplified, the anti-interference capability is improved, and the coding and decoding errors are reduced.

The embodiments of the present invention disclose an etching method, an etching device, and a perovskite component. The etching method is used to etch the top electrode of a cell to be etched; the etching method includes: shaping a Gaussian beam into a square flat-top beam; adjusting a preset focal position of the square flat-top beam; controlling the cell to be etched and the square flat-top beam to relative positions, and controlling the relative movement of the cell to be etched and the square flat-top beam along a first direction and / or a second direction; etching the cell to be etched according to the preset focal position, so that the depth of the etched groove 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 perovskite functional layer. The technical solution of the embodiment of the present invention, by converting a Gaussian beam into a square flat-top beam, and the lower edge of the focal depth of the generated square flat-top beam only acts on the top electrode on the surface of the film layer, reduces the actual power used and can avoid the influence of the laser on other functional layers in the perovskite component, thereby improving the performance of the perovskite component.

The invention relates to a spectrum detection device and method based on a multi-focus hollow focusing spot, and the method comprises the steps: enabling a laser beam emitted by a laser to be converted into a flat-topped beam through a beam shaper, and enabling the flat-topped beam to enter a first polarization modulation module through a first beam splitter prism, and converting the flat-topped beam into linearly polarized light; the linearly polarized light enters the spatial light modulator to be modulated into linearly polarized light with a vortex phase, and the linearly polarized light returns along the original path and is reflected by the first beam splitter prism, and then enters the second polarization modulation module to be converted into circularly polarized light with a vortex phase; circularly polarized light passes through the fly eye lens to form multi-focus hollow light spots which are distributed in a ring shape, passes through the focusing lens to form multi-focus hollow focusing light spots which are distributed in a ring shape and act on a plurality of to-be-detected object samples corresponding to the multi-focus hollow focusing light spots in position, various Raman scattering light is correspondingly generated, spectrum analysis is carried out on the Raman scattering light, and the Raman scattering light is analyzed to obtain the Raman spectrum of the to-be-detected object samples. And obtaining various types of spectral information. According to the invention, multi-focus parallel signal detection and acquisition are realized, and compared with a traditional single-point system, the analysis flux is greatly improved.