86 results about "Laser methods" patented technology

The invention relates to the technical field of laser SLAM, and particularly discloses a laser SLAM method based on ground segmentation, and the method comprises the steps: obtaining laser radar point cloud data information, carrying out the point cloud preprocessing of the laser radar point cloud data, and obtaining ground point cloud features and non-ground point cloud features; respectively carrying out feature extraction, feature matching and pose estimation on the ground point cloud features and the non-ground point cloud features to obtain a pose nonlinear optimization constraint result; selecting a key frame according to a pose nonlinear optimization constraint result, constructing a local map according to pose information of the key frame, and obtaining a local map construction result; loopback detection is carried out according to the local map construction result, and a loopback detection constraint result is obtained; and performing global pose optimization processing according to a loopback detection constraint result and a local map construction result to obtain a global pose and global map construction result. The laser SLAM method based on ground segmentation provided by the invention can improve the positioning precision and the operation stability.

The invention relates to a dynamic environment-oriented laser SLAM (Simultaneous Localization and Mapping) method and system and a medium. Comprising the following steps: training and deploying a target detection four-dimensional neural network; performing environment initialization and data processing, and constructing an initial dense point cloud map; forward and reverse propagation is carried out by using IMU data, and the current state of the robot is accurately estimated; performing point cloud registration to update the map; identifying and marking feature points of the dynamic target; updating the dynamic or static probability of voxels in the map according to the dynamic target detection result; and outputting the optimized map and the pose estimation of the robot. According to the method, the understanding of the dynamic environment is updated by adopting the voxel belief model, the information of the dynamic object is effectively fused into the map, meanwhile, the accurate representation of the static environment is reserved, and the accuracy and robustness of positioning, map construction and dynamic object recognition of the SLAM system in the dynamic environment are improved. And through an optimized data processing flow, efficient calculation performance and real-time performance are ensured.

The invention discloses a preparation method and structure of a back contact passivation cell, and belongs to the technical field of solar cells, and the preparation method comprises the steps: firstly, cleaning a semiconductor substrate, and starting to prepare a passivation layer on one surface of the substrate; depositing a protective layer on a single side of the back surface; selective grooving treatment is conducted on the protective film on the back face through laser equipment; then putting into a thermal diffusion furnace to complete the preparation of a first electrode on the back surface of the battery; the outermost protection layer can be used as a protection film of a back electrode, then phosphorus slurry is printed above a laser untreated area on the back surface of the protection layer, then thermal annealing treatment is carried out, and a passivation anti-reflection film is deposited on each of the front surface and the back surface of the cell after thermal annealing treatment is completed; and finally completing the preparation of the battery. According to the invention, a one-step laser method is used to solve the possibility that the back contact cell generates electric leakage at the electrodes of two different doping types.

According to the semantic map construction method based on deep learning and laser SLAM, a semantic segmentation method based on deep learning and a laser SLAM method are fused, a three-dimensional map with semantic tags is constructed in real time, and richer information support is provided for applications such as robot navigation and automatic driving. The invention provides a set of complete solution for challenges such as complexity and dynamics of an outdoor environment, large-scale and high-precision requirements, illumination and weather changes, semantic information requirements and the like.

The size detection device based on the laser method comprises a detection platform, a detected piece supporting assembly for supporting a detected piece and a laser sensor detection assembly, the detected piece supporting assembly and the laser sensor detection assembly are both installed on the detection platform, and the size detection device based on the laser method is characterized in that the laser sensor detection assembly comprises a plurality of laser sensors; the distribution of the plurality of laser sensors is matched with the size and the shape of a detected piece, each laser sensor consists of an emitter for emitting detection laser to the detected piece and a receiver for receiving the detection laser, the emitters and the receivers are arranged in a one-to-one alignment manner along the vertical direction, and the detected piece is supported between the emitters and the receivers. Reliable supporting and positioning of the detected piece are formed, automatic detection of the size of the detected piece is achieved, the size detection efficiency of the detected piece is improved, and the size detection precision is guaranteed. The invention further provides a size detection method based on the laser method.

The application relates to a laser SLAM method and system based on height information. The method comprises the following steps: acquiring three-dimensional laser radar data, performing motion distortion and dynamic point filtering processing to obtain first point cloud data; acquiring robot IMU data, performing pre-integration processing to obtain first pose data; extracting features from the first point cloud data to obtain feature point cloud, recording the height of the feature point cloud, and obtaining laser radar odometry data according to the feature point cloud and the height of the feature point cloud; fusing the first pose data and the laser radar odometry data based on a factor graph to obtain second pose data as the robot pose; and determining corresponding point cloud data according to the second pose data and splicing to generate a three-dimensional point cloud map. The application can enable the robot to realize high-precision self-positioning and high-precision mapping in an unfamiliar cluster point scene.

The present invention provides an optoelectronic interconnection packaging structure and a preparation method therefor. The method comprises: using a laser method, forming a first blind hole and a second blind hole, the bases of the first blind hole and the second blind hole being in a glass substrate, then performing thinning processing on a first surface of the glass substrate and a second surface of the glass substrate, to form a first through hole and a second through hole, respectively, that are arranged in an offset manner. On the basis of the laser method and the thinning processing, the present application can prepare a high-performance TGV adapter plate on a glass substrate that has a relatively small pitch and a relatively small CD size, is thin and suitable for high-density arrangement, and can effectively prevent metal posts from overlapping. In addition, an optical waveguide layer is disposed between the glass substrate and a rewiring layer, and the TGV adapter plate is used to connect an electrical chip and an optical chip, which can make metal wiring more flexible, achieve photoelectric interconnection integration, reduce package size, lower power consumption, and improve reliability. The application is thus applicable to high-density integrated packaging, and can achieve good optoelectronic signal transmission.

The invention discloses a single-line laser SLAM (Simultaneous Localization and Mapping) method based on visual inertia enhancement, which belongs to the technical field of multi-sensor fusion localization, and comprises the following steps: firstly, extracting point-line features from an input image, detecting angular points of the point features by adopting a Shii-Tomasi algorithm, tracking and matching feature points by adopting a KLT optical flow algorithm, extracting the line features by adopting a proposed self-adaptive threshold line segment extraction algorithm, and extracting a single-line laser SLAM (Simultaneous Localization and Mapping) algorithm; calculating an LBD descriptor, then matching and tracking line features, and in front-end pose estimation, carrying out tight coupling on a re-projection error of point-line features and an IMU pre-integration error, and constructing a sliding window optimization framework. A high-frequency pose output by the vision-inertia module is used as a priori initial value of laser radar point cloud registration, and distortion correction is performed on laser point cloud, so that the local optimum problem of laser SLAM in a rapid motion or feature degradation scene is effectively solved; line features are extracted from the laser point cloud, laser line feature errors and IMU pre-integration errors are jointly optimized, and registration precision and robustness in a structured environment are improved.

The invention provides a 3D laser SLAM method and device based on optimized loopback detection and a medium, and relates to the technical field of simultaneous positioning and mapping of robots, and the method comprises the following steps: (1) a data preprocessing step: receiving original data of an IMU and a laser radar Lidar, and carrying out the denoising and time synchronization processing; (2) a feature extraction and map construction step: extracting angular point and surface point features from the preprocessed data, performing pre-integration on IMU data to obtain an initial pose, and performing registration on a current Lidar point cloud and a local map to construct a global map; (3) loopback detection: generating an enhanced descriptor based on the key frame point cloud, and constructing a KD-Tree structure with dynamic resolution for storage and indexing; and carrying out rough search on loopback candidate frames by inquiring the KD-Tree, carrying out two-stage pose matching on the candidate frames to confirm loopback, and dynamically distributing the weight of loopback constraint according to the environmental complexity. The loopback detection success rate can be improved, and dynamic scene mapping drift is reduced.

The invention discloses a laser SLAM system and method for removing a dynamic point cloud based on motion detection, the laser SLAM system comprises an input module, an IMU pre-integration module, a dynamic removal module, a feature extraction module and a matching optimization module, and the laser SLAM method comprises the steps: carrying out the pre-integration of an IMU measurement value, and obtaining a prior pose; the dynamic point cloud is identified through motion detection, error detection suppression is completed by using clustering and near-earth detection methods, and dynamic objects in the laser point cloud are removed preferentially; using a vertical clustering method to improve the extraction of edge features of the residual static background to obtain stable geometric feature points; the feature points are transmitted to a pose optimization module for registration and factor graph optimization to obtain an optimal pose; according to the method, the dynamic point cloud can be effectively filtered in a dynamic environment, and the positioning precision of a radar odometer and the accuracy of a point cloud map are improved.

The invention discloses a laser cleaning permeable membrane device which comprises a workbench, a laser emitting mechanism, a permeable membrane moving and overturning mechanism, a feeding and discharging mechanism and a spraying auxiliary mechanism are installed at the upper end of the workbench, and the laser emitting mechanism comprises a laser emitting assembly. The permeable membrane moving and overturning mechanism can clamp, translate and overturn a permeable membrane, the feeding and discharging mechanism can be matched with the permeable membrane moving and overturning mechanism to feed and discharge the permeable membrane, the spraying auxiliary mechanism comprises a water tank and an air pump, and an electric heating plate is fixedly mounted in the water tank. The air outlet end of the air pump communicates with the interior of the water tank through a pipeline, and a spray pipe is inserted into the upper end of the water tank. By means of the structural arrangement, physical and chemical pollution of the film layer can be removed in a high-precision and all-around mode, meanwhile, controllability of the laser method is high, damage to the surface of the film is avoided, and the problem of chemical pollution existing in an existing cleaning technology is solved.

The present invention discloses a portable terahertz solid source interferometer, which includes an interferometer box body, a main optical path platform, a detection and data processing platform, and a plasma detection platform. The three modular platforms of the main optical path platform, the detection and data processing platform, and the plasma detection platform are fixed on the bottom plate of the interferometer box body. The interferometer uses two terahertz solid sources with selectable frequencies as light sources, generates a heterodyne signal through the dual-laser method, and uses the heterodyne interferometer optical path to measure the plasma electron density. This device can solve the problem of convenient measurement of the plasma electron density of most plasma generating devices. By designing the specific structure of the portable terahertz solid source interferometer, a compact, movable, and easy-to-operate system layout is realized, and it is applicable to multiple scenarios and a wide plasma density range, providing a convenient and fast measurement tool for plasma density measurement.

The present invention discloses an improved laser SLAM method for a coal mine rescue robot, comprising: using a coal mine rescue robot sensor module to obtain underground rescue environment point cloud data; completing downsampling of the current frame point cloud; performing inter-frame registration and registration optimization; eliminating the cumulative error of the pose estimation of the front-end odometer module to achieve globally consistent robot pose estimation and accurate mapping. The method of the present invention uses only a single laser radar sensor for underground rescue environment perception, avoiding the data inaccuracy problem caused by the use of multiple sensors such as IMU in the bumpy underground environment, using an adaptive filtering method to maintain a relatively stable number of points to be matched and an improved loop detection method to improve the accuracy of loop detection and correct the front-end odometer pose. The present invention enables the rescue robot to achieve high-precision positioning and mapping in underground rescue environments that are challenging for odometers.

The invention provides a photoelectric interconnection packaging structure and a preparation method thereof, and the method comprises the steps: forming a first blind hole and a second blind hole of which the bottoms are located on a glass substrate through a laser method, and then carrying out the thinning process from a first surface of the glass substrate and a second surface of the glass substrate, thereby forming a first through hole and a second through hole which are formed in a staggered manner, according to the invention, the high-performance TGV adapter plate which is small in spacing, small in CD size, thin, suitable for high-density setting and capable of effectively avoiding overlapping of metal columns can be prepared on the glass substrate based on a laser method and a thinning process; furthermore, an optical waveguide layer is arranged in the glass substrate and the rewiring layer, and an electric chip and an optical chip are connected by combining a TGV adapter plate, so that the metal wiring is more flexible, the photoelectric interconnection integration is realized, the packaging size is reduced, the power consumption is reduced, the reliability is improved, the optical waveguide layer is suitable for high-density integrated packaging, and good photoelectric signal transmission can be realized.

Provided are a post-processing device and a recording system, which can appropriately perform post-processing even when a recording device is replaced with a recording device of a different recording method without replacing the post-processing device. A control section can acquire, as information related to a recording device, first information that can specify that the recording method of the recording device is an inkjet method and second information that can specify that the recording method of the recording device is a laser method. The control section acquires information related to the recording device, performs post-processing based on a first setting when the information related to the recording device includes the first information that can specify the inkjet method, and performs control related to post-processing based on a second setting different from the first setting when the information related to the recording device includes the second information that can specify the laser method.

The invention discloses a micro-nano spray needle manufacturing method based on plant villus and a micro-nano spray needle. The manufacturing method of the micro-nano spray needle based on the plant villus comprises the following steps: S1, preparing a plant villus mold by adopting a freezing method; s2, pouring is conducted on the plant villus mold through a pouring method, and a spray needle model which is based on the plant villus and provided with nano channels is obtained; and S3, a micron channel is etched above the spray needle model with the nano channel obtained in the step S2 through a laser method, and the micro-nano spray needle is obtained. According to the micro-nano spray needle manufacturing method based on the plant villus and the micro-nano spray needle, the micro-nano spray needle is manufactured in the mode that the plant villus mold with the nano channel is obtained through the villus on the surface of the plant leaf, and the micro-nano spray needle has the advantages of being simple in preparation process, low in preparation cost and easy to manufacture on a large scale.

The invention provides a particulate matter concentration detection method and equipment. The particulate matter concentration detection method is applied to the particulate matter concentration detection equipment, and the particulate matter concentration detection equipment comprises beta-ray method equipment and a laser method module. The method comprises the following steps: the laser method module detects the input particulate matter concentration, outputs real-time detection data, and outputs first detection data according to the real-time detection data; the beta-ray method equipment detects the input particulate matter concentration and outputs second detection data; obtaining a calibration relationship according to the second detection data and the first detection data, and calibrating the real-time detection data according to the calibration relationship to obtain the particulate matter standard concentration data. According to the method and the device, the real-time performance and the accuracy required by particulate matter concentration detection can be met at the same time, and the accuracy and the timeliness of particulate matter concentration detection are improved.

The invention discloses a system for testing turbidity in water by a laser method, which comprises a measuring cell, a laser source, an image collector and a computer, the measuring cell is made of a transparent material, a liquid inlet pipe and a liquid discharge pipe are arranged on the measuring cell, and a flow meter is arranged on the liquid discharge pipe and is used for calculating the water flow volume V in the measuring cell in unit time; the laser source and the image collector are oppositely arranged on the two sides of the measuring cell, the laser source is used for emitting a laser beam towards the measuring cell, and the image collector is used for collecting a particle image in test water in the measuring cell; the computer is in signal connection with the image so as to obtain the particle count m and the particle equivalent volume v in the water in unit time, the density rho of the tested water is defined, and the turbidity is equal to mrho v / V. According to the system for testing the turbidity in the water by the laser method, the testing process is simplified, the complexity and the complexity of preparing a standard solution are reduced, the health risk is effectively reduced, and the system has relatively high testing accuracy.

The invention discloses a derusting gel aiming at heavily rusted steel and a derusting method of gel cooperating with continuous laser, and belongs to the technical field of steel derusting. Mixing a copper chloride solution and a thiourea solution, stirring to obtain white gel, adding concentrated hydrochloric acid, mixing and stirring to obtain rust removal gel; 0.2-0.5 wt% oxalic acid solution is sprayed to the surface of the rusted steel, 0.5-1.0 wt% ammonium bicarbonate solution is sprayed 10-20 min later, and a laser cleaning machine is adopted to conduct wet-type continuous laser pretreatment on the surface 1-5 min later; and the surface of the pretreated steel is coated with rust removal gel, and after coating is conducted for 15-30 min, continuous laser rust removal is conducted on the surface through a laser cleaning machine. When gel rust removal and continuous laser rust removal are cooperatively combined, the advantages of a chemical method and the advantages of a laser method can be exerted, the purpose of efficiently removing corrosion products on the surface of the heavily-corroded steel plate in a short time is achieved, and basically no damage is caused to a steel base body.

This invention provides a method for manufacturing a diamond wire saw for cutting silicon carbide single-crystal substrates. First, impurities are removed from the diamond micro-powder abrasive. During the abrasive application process, the abrasive density *a* on the steel wire is monitored in real-time via images and videos, and the feeding rate of the diamond micro-powder abrasive in the feeding container is controlled accordingly, achieving a first-step closed-loop control. In the subsequent nickel plating thickening process, the concentricity of the thickened layer on the steel wire and the continuous stability of its thickness are controlled. Before winding, the wire saw diameter *d* is measured using a laser method. Based on the mapping relationship between the wire diameter *d*, abrasive density *a*, and plating thickness *c*, a second closed-loop control is implemented for the entire wire saw production process. The two closed-loop controls operate nested together, ensuring precise control throughout the entire process. The diamond wire saw obtained by this method exhibits high continuous stability in various performance indicators, ensuring good process stability during the cutting of single-crystal silicon carbide substrates, thereby reducing cutting risks.

This invention relates to a laser SLAM method and system that integrates visual loop closure detection. The method includes: S1: acquiring laser point cloud data using a 3D LiDAR and constructing laser point cloud keyframes, and using these keyframes to obtain current positioning information; S2: registering the point cloud data contained in each laser point cloud keyframe to the world coordinate system to obtain a global point cloud map; S3: acquiring visual images using a visual camera and fusing the laser point cloud keyframes to construct point cloud-image fusion keyframes to detect loop closure information. When a loop closure is detected, the corresponding loop closure constraint and loop closure trajectory are obtained; S4: establishing a pose graph model based on all point cloud-image fusion keyframes on the loop closure trajectory, and optimizing the pose graph model using loop closure constraints as constraint edges to obtain optimized point cloud-image fusion keyframes to update the current positioning information and the global point cloud map. The method and system provided by this invention can improve the accuracy of positioning and mapping in laser SLAM systems.

Method (1) for laser processing of a glass or glass-ceramic element (2), in which: - the laser beam (7) of an ultrashort pulse laser (10) is concentrated to an elongated focus in the glass or glass-ceramic element (2) by means of a focusing optic (3), wherein: - a pulse power of the ultrashort pulse laser (10) is set which is sufficient to generate filament-shaped damage (6) within the glass or glass-ceramic by means of the laser pulses focused in the glass or glass-ceramic, wherein the focusing optic (3) comprises a lens (4) arranged in the beam path of the ultrashort pulse laser (10), and wherein: - by means of a lens movement device (9), during operation of the ultrashort pulse laser (10), the lens (4) is moved transversely to the beam direction (70) so that the position of the optical axis (40) of the lens (4) relative to the position of the laser beam (7) is changed.and the movement of the lens (4) relative to the laser beam (7) deflects the laser beam (7) and thus shifts the point of impact (71) of the laser beam on the glass or glass-ceramic element (2), wherein the point of impact (71) is guided along a predetermined path forming a dividing line (12) by means of a computing device (15), wherein the lens movement device (9) is controlled by successively emitting control signals, wherein, in response to the successively emitted control signals, the lens (4) of the focusing optics (3) is moved transversely to the beam direction (70), so that the position of the optical axis (40) of the lens (4) changes relative to the position of the laser beam (7), thereby moving the point of impact (71) of the laser beam (7) on the glass or glass-ceramic element (2),wherein- by means of a movement device (17) the glass or glass-ceramic element (2) is moved relative to the ultrashort pulse laser (10) during the incident laser beam (7), so that the point of impact (71) of the laser beam (7) is guided along a predetermined path forming the dividing line (12), which is formed by the superposition of the positions set by means of the lens movement device (9) and the movement device (17), wherein- by the movement of the lens (4) deviations of the point of impact (71) from the predetermined dividing line (12) caused by undesired movement of the glass or glass-ceramic element (2) relative to the ultrashort pulse laser (10), in particular by vibrations or overshoot, during a change of direction of movement are compensated.

A method of dividing, into a plurality of units, a glass substrate including a glass core, an upper stack stacked on a top surface of the glass core, and a lower stack stacked on a bottom surface of the glass core, includes a stack removal operation of removing an upper stack and a lower stack of a division target region along a predetermined line by using a laser, a laser perforation operation of perforating the glass core along the predetermined line by using the laser, and a physical or laser breaking operation of dividing the glass substrate on which the perforation operation is performed, into the plurality of units by using a physical or laser method.

The invention discloses an obstacle detection method for a mobile robot, and belongs to the technical field of obstacle detection, the mobile robot is provided with a line laser sensor, the line laser sensor is used for emitting line laser inclining downwards relative to the horizontal plane, and the method comprises the steps that light spot information of the line laser emitted by the line laser sensor is acquired; determining a laser spot and an obstacle point set on the ground in the emitting direction of the line laser sensor according to the light spot information; determining the distance between each obstacle point in the obstacle point set and the corresponding projection point; and determining whether an obstacle corresponding to the obstacle point set is an obstacle to be cleaned or not according to the distance between each obstacle point and the corresponding projection point. According to the method, a scheme for detecting obstacles in a specific size range by using the line laser is realized, and a relatively good obstacle detection effect is achieved.

Methods and systems for down-conversion of high frequency signals in millimeter-wave (mm-wave) communications and for up-conversion of high frequency signals in millimeter-wave (mm-wave) communications. A quantum dot multi-wavelength laser (QD MWL) source generates an optical signal comprising of a plurality of optical channels and allows flexible selection of the optical channels which can be used to generate and process RF signals in higher frequency bands of mm-wave spectrum including K-band, Ka-band V-band, W-band encompassing all 3GPP NR FR2 bands and even THz range depending on the channel spacing.

According to the photoelectric interconnection packaging structure and the preparation method thereof provided by the invention, the TGV metal columns and the optical waveguide layers are prepared in the glass substrate based on a laser method, and the composite optical waveguide substrate with the interconnected TGV metal columns and the laminated optical waveguide layers is prepared after stacking and bonding, so that the layout of multiple layers of optical waveguides can be realized based on the TGV adapter plate; high-density and high-performance integration of an electric chip and an optical chip is realized, the packaging size is reduced, the power consumption is reduced, the reliability is improved, and good photoelectric signal transmission is realized.

The invention relates to the technical field of ferroelectric materials, in particular to a ferroelectric functional film and a preparation method thereof. The method comprises the following steps: depositing a target material on a substrate by adopting a pulse laser method, and carrying out post-treatment after deposition to obtain a ferroelectric functional film; the target material comprises one or two of a lead titanate target material and a strontium titanate target material. By changing technological parameters in the pulse laser deposition process, accurate control over the domain structure of the ferroelectric film is achieved, and the high-density and small-size domain structure is formed. The high-density domain structure obviously improves the physical properties such as piezoelectricity, dielectricity and the like of the ferroelectric film, and provides a material basis for high-performance electronic devices. The ferroelectric film prepared by the technology has potential application value in the field of high-density information memories, and is expected to solve the problem of density limitation in the existing storage technology.

The invention provides a photoelectric interconnection packaging structure and a preparation method thereof, and the method comprises the steps: forming a first blind hole and a second blind hole of which the bottoms are located on a glass substrate through a laser method, and then carrying out the thinning process from a first surface of the glass substrate and a second surface of the glass substrate, thereby forming a first through hole and a second through hole which are formed in a staggered manner, according to the invention, the high-performance TGV adapter plate which is small in spacing, small in CD size, thin, suitable for high-density setting and capable of effectively avoiding overlapping of metal columns can be prepared on the glass substrate based on a laser method and a thinning process; furthermore, the optical waveguide layers are arranged on the two faces of the glass substrate, and the electric chips and the optical chips are connected in combination with the TGV adapter plate, so that metal wiring is more flexible, photoelectric interconnection integration is achieved, the packaging size is reduced, the power consumption is reduced, the reliability is improved, the optical waveguide layer is suitable for high-density integrated packaging, and good photoelectric signal transmission can be achieved.

A pavement texture depth measurement apparatus and measurement method, which effectively solve the problems of a sand-spreading method having a relatively large error and a laser method having a principle defect. Compared with a traditional a sand scraping method, carrying fine sand by means of water flows into pavement cracks make the pavement gaps be more fully filled; compared with a traditional manner in which the amount of sand is measured in advance and in which scraping and leveling are performed, using the amount of fine sand reduced in a sand storage chamber (4) as the volume of the fine sand in the pavement gaps eliminates the artificial subjective judgment for a scraping and leveling state, and therefore the amount of sand is more rationally measured. In addition, the amount of sand reduced in the sand storage chamber (4) is calculated by means of the change in air pressure, such that a tiny change in the volume can be accurately measured; moreover, since the spreading area of the fine sand is defined as a constant value by using a cylinder body (1), a more rational and accurate amount and area of sand can be obtained, and thus a more accurate measurement result is obtained.

The present invention discloses an ultra-thin heat spreader super-hydrophilic micro-nano structure liquid absorbent core, comprising a liquid absorbent core and a heat spreader cover plate, wherein the liquid absorbent core is directly prepared on the heat spreader cover plate; the liquid absorbent core is composed of a periodically distributed micron array and channels around it; the surface of the micron array and the surface of the channels around it are densely distributed with nano-scale substructures, and the three constitute a micro-nano full-coverage structure containing rich micro-cavities; the surface of the micro-nano full-coverage structure is provided with a high surface energy oxide coating. Compared with the traditional preparation methods of the existing liquid absorbent core by powder spraying sintering and copper wire mesh liquid absorbent core, the laser method for preparing the liquid absorbent core has fewer process steps, shorter process, higher efficiency, better structural consistency, higher stability, and better comprehensive performance, and can achieve the lowest heat pipe thickness and the best heat dissipation effect.