46 results about "Laser energy density" patented technology

The invention provides a transparent restraint layer suitable for laser shock and a laser shock forming method and device of a metal plate, belongs to the technical field of metal plate laser processing, and aims to solve the technical problem of failure of the restraint layer in a low-temperature environment. The forming method comprises the steps that an absorption layer and a transparent restraint layer are sequentially laid on the surface of a to-be-impacted workpiece, and the transparent restraint layer sequentially comprises a polyurea-polyurethane elastomer layer, a nanofluid layer and a hydrogel layer in the direction close to the to-be-impacted workpiece to the direction away from the to-be-impacted workpiece; a single-laser-head or multi-laser-head array is adopted to implement pulse impact, and a temperature-stress-displacement multi-physical-field closed loop is constructed through displacement sensing, temperature sensing and ultrasonic stress sensing; and the industrial controller operates a model prediction control algorithm to perform linkage optimization on the laser energy density E, the scanning speed v and the hydrogel layer volume flow q. Compared with an existing double-layer constraint and double-feedback scheme, the method has remarkable technical progress in the aspects of low-temperature stability, array consistency and forming consistency.

The application discloses a glass substrate hole modification method and an integrated waveguide manufacturing method, and comprises the following steps: focusing a laser focus on one side of a glass substrate close to the bottom surface thereof; controlling the laser focus to perform annular scanning along the outer contour of a preset hole to form a closed modification ring; controlling the laser focus to perform point-by-point scanning with a preset dot array interval in the internal area surrounded by the modification ring to form an array distributed modification dot array; and making the laser energy density of the annular cutting area of the modification ring lower than the laser energy density of the filling area of the modification dot array. The application can assist in high-precision preparation of a through hole and a blind hole with a vertical sidewall and a flat bottom on a glass substrate, thereby effectively improving the performance of a millimeter wave slow wave passive device and reducing the cost.

This invention discloses a method for preparing epitaxial stress-controlled polarized metals, belonging to the field of functional oxide thin film preparation. The method includes: performing a special high-temperature annealing pretreatment on a YAlO3(111) substrate; calibrating the pulsed laser deposition rate and using a moving mask technique to prepare a wedge-shaped thin film with continuously varying thickness; and precisely controlling key process parameter windows such as growth temperature, laser energy density, oxygen partial pressure, and the distance between the target and the substrate. This invention obtains an ideal nucleation template by optimizing the substrate pretreatment process, achieves linear modulation of the thickness gradient by precisely controlling the matching of the mask moving speed and deposition rate, and obtains a high-quality polarized metal thin film with a room temperature resistivity as low as 173 μΩ·cm and stability across the entire temperature range by systematically optimizing key process parameters. This method has the advantages of high repeatability, high control precision, and wide applicability, and can be extended to the preparation of other perovskite oxide thin films, showing broad application prospects in the field of polarized electronic devices.

Systems and methods for simulating laser energy density simulate a laser treatment process to be performed on a part by a laser processing system and determine simulated energy density values ​​at points on the surface of the part to be treated. The simulated energy density value is determined at each point on the surface of the part to be treated by virtually measuring the light distance to each point and the light angle at each point during the simulation of the laser treatment process. The light distance and light angle are virtually measured based on the origin of the light rays associated with an optical assembly used to deliver the laser to the surface. The optical assembly may include a scanning optics assembly that scans the laser beam on the surface or a projection optics assembly that projects the laser beam onto the surface. The simulated energy density value determined by the simulation can be used to optimize the actual laser treatment process.

The invention discloses a nanosecond laser precision machining method for a SiCf / SiC composite material, and belongs to the field of laser machining and advanced composite material manufacturing. The method comprises the following steps: carrying out linear ablation or surface ablation on a pretreated SiCf / SiC composite material by adopting nanosecond pulse laser with the wavelength of 355 nm; the laser energy density, the scanning speed, the scanning times, the line overlapping ratio and the scanning path are optimized through the system, and high-precision and low-damage machining is achieved. The core optimization parameters are as follows: the laser energy density is 5.33 J / cm < 2 >, the scanning speed is 200mm / s, the line overlapping rate is 66.58%, and a one-way scanning mode is adopted. Through the combination of experiments and simulation, the mechanism (melting, evaporation, decomposition, and material removal by liquid drop splashing and gas volatilization) of nanosecond laser ablation of SiCf / SiC is disclosed, the heat affected zone, the oxidation phenomenon and the recondensate defect are effectively controlled, the quality and the contour precision of the machined surface are remarkably improved, and the machining precision is improved. The method is suitable for micromachining of key components such as aerospace engine hot end components and medical high-end equipment.

The invention discloses a numerical simulation method and system for continuous laser irradiation of 7075 aluminum alloy under the action of an external load based on a modified Johnson-cook model. According to the scheme, on the basis of the heat conduction principle and an elastic-plastic model, a heat-force coupling model of the continuous laser irradiation 7075 aluminum alloy is established through a finite element method; through continuous laser irradiation and tensile experiments, the effectiveness of the numerical simulation model of the continuous laser irradiation spaceflight-grade high-strength 7075 aluminum alloy under the action of the external load is verified; the laser energy density, the light spot pattern and the external load are imported into the model by adding vdflux and vuamp programs written by a Fortran language, and a correction factor function is added for regulation and calculation. According to the method, a correction factor function is adjusted in a Fortran program along with working conditions to ensure that stress field distribution, temperature field distribution and plate deformation conditions of the high-strength aluminum alloy under the combined action of laser and an external load are flexibly and accurately simulated.

The invention discloses a preparation method of a thin film micro-diode and the thin film micro-diode, which are applied to the technical field of micro-diodes, and comprises the following steps: setting a nano patterned substrate; the nano patterned substrate is provided with a top layer part and a bottom layer part based on the arranged nano columns, and the difference value between the energy density of laser irradiated to the top layer part based on the laser lift-off process and the energy density of laser irradiated to the bottom layer part does not exceed 80% of the laser energy density; epitaxially growing a GaN-based LED structure on the surface, provided with the nano columns, of the nano patterned substrate; and irradiating the nano patterned substrate by using laser based on a laser lift-off process, and separating the nano patterned substrate from the GaN-based LED structure. By using the nano patterned substrate, the GaN-based LED structure can have relatively high light emitting efficiency. And the stripping yield in the laser stripping process can be remarkably improved by regulating and controlling the energy density difference of the laser irradiated on the top layer part and the bottom layer part of the nano patterned substrate in the laser stripping process.

This invention discloses a supportless additive manufacturing method for extreme horizontal overhanging structures. The horizontal overhanging region is divided into three areas using different laser control strategies: an initial overhanging region, a low-heat-input region, and a high-heat-input region. The initial overhanging region is used to establish a stable initial overhanging structure; the low-heat-input region is used to suppress thermal stress accumulation and warping; and the high-heat-input region is used to improve the strength of the overhanging structure and repair internal defects. This invention achieves warping-free, complete printing of horizontal overhanging structures, significantly improving manufacturing efficiency and the design freedom for complex structures. Furthermore, corresponding energy control strategies for the low-heat-input and high-heat-input regions are provided for the initial overhanging region using different laser energy densities, broadening the process window for supportless printing of overhanging structures.

Disclosed are a heating device and method for heating a to-be-processed semiconductor substrate in a laser annealing process, a laser annealing device and method using same, and a semiconductor device manufacturing device and method. The heating device disclosed herein is for heating a to-be-processed semiconductor substrate in a laser annealing process by using a laser. The heating device may be configured to heat the to-be-processed semiconductor substrate loaded thereon and differently control the heating temperature according to the region of the to-be-processed semiconductor substrate. The heating device may be configured to control so that the temperature of a region having a relatively low laser energy density in the to-be-processed semiconductor substrate is higher than the temperature of a region having a relatively high laser energy density in the to-be-processed semiconductor substrate.

The invention belongs to the technical field of engineering and theoretical research of a laser shock technology, and particularly relates to a laser shock micro-mesoscale simulation method for a benchmarking experiment, which is suitable for simulation research of laser shock and comprises the following steps: determining laser energy density I0 of laser shock of the benchmarking experiment; calculating the energy density I of shock waves generated by the laser shock material; calculating the equivalent piston speed UP of the induced shock wave; and performing simulation by taking the equivalent piston speed UP as a boundary condition. According to the invention, the simulation boundary conditions can be conveniently and accurately corresponding to the experimental parameters, so that the simulation accuracy is improved; material parameters involved in the parameter conversion process can be obtained through various low-cost modes such as a high-speed impact experiment and simulation, and it is avoided that pressure field distribution is determined directly through an expensive laser impact experiment; the method is high in portability and suitable for micro-mesoscale laser shock simulation of any platform.

This invention relates to a 3D printing additive manufacturing method for die-casting mold steel metal powder. The metal powder has the following mass percentage content: carbon: 0.20-0.28%, silicon: <0.1%, manganese: 0.20-0.5%, molybdenum: 1.30-1.80%, chromium: 1.50-2.50%, vanadium: 0.10-0.50%, tungsten: 0.3-0.6%, nickel: 2.00-3.00%, copper: 0.80-1.00%, sulfur: ≤0.02%, phosphorus ≤0.025%, oxygen ≤0.025%, with the remainder being Fe and unavoidable impurities. The additive manufacturing method employs selective laser melting, with a laser power of 200W-320W, a laser scanning speed of 800-1100mm / s, a scanning spacing ≤0.1mm, and a laser energy density of 68.17-127.08J / mm². 3 The powder layer thickness is ≤0.03mm, the scanning strategy is 65~70°, and the substrate preheating temperature is 120~150℃ to obtain the alloy. Its beneficial effects are: through alloy composition design and selective laser melting, the prepared alloy exhibits low crack sensitivity and high thermal conductivity, achieving a dual improvement in strength and toughness. It ensures the formation of high-toughness, low-expansion lath martensite, providing excellent toughness while possessing extremely good weldability and being less prone to cracking.

The application belongs to the technical field of additive manufacturing titanium alloy, and particularly relates to a heat treatment method of additive manufacturing Ti-Zr alloy for dentistry. The Ti-Zr alloy is Ti-15Zr alloy after annealing treatment and additive manufacturing; the additive manufacturing comprises an SLM process, and SLM forming parameters are as follows: laser energy density is 100-110 J / mm 3 , laser power is 180-210 W, scanning speed is 800-1200 mm / s, scanning interval is 0.07-0.09 mm, and powder layer thickness is 0.02-0.04 mm. The annealing treatment temperature is 780-820 DEG C, the holding time is 25-35 min, and the product is obtained through water quenching. The ultimate tensile strength of the obtained product is 1265-1275 MPa, the yield strength is 1015-1020 MPa, and the elongation is 10.6-10.7%. The application has simple and controllable process, high efficiency, and excellent product performance, and is convenient for large-scale industrial application.

The application discloses a laser remanufacturing repair method for metal shaft parts, and relates to the technical field of laser repair.The method comprises the following steps: placing a target shaft part to be repaired on a workbench, performing repair processing on a cladding area of the target shaft part by using flat-top light, obtaining a repaired shaft part, and adjusting the focal depth length of the flat-top light in real time by using an external optical device; and stopping the repair operation after detecting that the size of the repaired shaft part meets the preset required size.The application achieves the technical effect of making the laser energy density distribution uniform and improving the fatigue resistance of the shaft part and the consistency of the overall repair quality.

The application discloses a kind of copper electrode laser curing system and method of TOPCon solar cell, the system includes mid-infrared laser generation module, beam shaping and energy management module, precision motion and positioning platform and synchronous control and monitoring module.The method used is: after coating copper paste on the back silver seed layer of TOPCon battery, laser beam is irradiated, by accurately controlling laser energy density and pulse width, energy is selectively resonant absorbed by copper paste organic matter, millisecond level rapid curing is realized, while ensuring that energy density is lower than the damage threshold of lower layer aluminum oxide / silicon nitride passivation film, so that the base temperature rise is lower than 200 DEG C.The application overcomes the defects of traditional thermal curing, such as low efficiency, high energy consumption and easy damage to passivation layer, and provides an efficient, reliable and non-damage battery performance industrialization solution for TOPCon battery low-cost "de-silverization".

The present application relates to the field of precision laser processing and new energy battery manufacturing technology, specifically to a battery laser cutting heat affected zone optimization method, comprising: parameter mapping coding unit, receiving material physical property parameters and laser energy density instruction, converting physical working condition into fluid mechanics state vector; Thixotropy operator calculation unit, real-time monitoring of virtual strain front, solving the stress offset item for physical inhibition of heat diffusion in reverse; Dynamic tensor damper unit, receiving stress offset item; MOPA laser execution unit, responding to time domain shaping instruction, while executing cutting, using perturbation signal to destroy plasma shielding layer to form a virtual cold ring with high thermal resistance; The present application overcomes the feedback lag caused by the limitation of sampling frequency in traditional infrared monitoring, and realizes the microsecond level active defense of the heat affected zone.

The present application relates to laser ultrasonic nondestructive testing technical field, specifically to a kind of based on ultrasonic signal amplitude judgment material laser ablation threshold method.The present application uses pulsed laser to irradiate the surface of material to be measured multiple times with energy lower than reference ablation threshold, obtains reference signal by laser vibrometer acquisition ultrasonic displacement time domain signal and average, extracts reference amplitude;According to preset energy step, gradually increase the energy of pulsed laser to form multiple energy levels, corresponding ultrasonic displacement time domain signal is collected;After band-pass filtering, detrending and normalization processing to signal, extract maximum peak-peak value, calculate the drop coefficient of each energy level average amplitude relative to reference amplitude;When first appear continuously three energy levels drop coefficient are all greater than preset threshold, the laser energy density corresponding to the minimum energy level among them is determined as laser ablation threshold.The present application only needs conventional laser vibrometer, without destructive observation afterwards, calibration is fast and accurate.

The utility model discloses a superhard PCD cutter based on laser cutting process optimization, which comprises a length shell, the top end of the length shell is connected with a screw rod in a sliding manner, the top end of the screw rod is provided with an assembly head, the top end of the assembly head is fixedly provided with a cutter bar, the top end of the cutter bar is fixedly provided with a cutter head, and the length shell is internally provided with a lifting assembly. According to the ultrahard PCD cutter optimized based on the laser cutting technology, the cutter head is composed of the base block and the outer shell, the laser energy density distribution is optimized, the cutting efficiency is improved, the cutting efficiency is improved, and the cutting quality is improved. The cutting heat input is matched with the thermal expansion coefficient of the gradient transition layer, the interface stress concentration is reduced, the strength is high, and the service life of the tool bit is prolonged; a base block is made of WC-10% Co hard alloy, a shell is made of diamond with the particle size of 5 micrometers and 8% SiC binding agents, the sintering pressure is 5.5 GPa, the temperature is 1450 DEG C, the hardness is high, and systematic laser machining is facilitated.

The invention provides a biochar core composite material and a preparation method and application thereof, the biochar core composite material is composed of a hollow mesoporous biochar core (HMB), a biological siloxane shell layer (Si-shell) and a phase change layer (PCM), and the chemical formula is Si-HMB-C-PCM. The composite material provided by the invention has extremely high photo-thermal conversion rate, the photo-thermal conversion rate is 85-95% in the near-infrared band of 808-1064 nm, the laser energy density required by etching is greatly reduced, and the required laser energy density is 0.45 J / cm; the etching precision and speed are greatly improved, the minimum line width capable of being etched is 10 microns, and the marking speed (100% contrast ratio) reaches 800 mm / s; according to the present invention, the film has characteristics of excellent thermal control and excellent environmental protection, the thermal diffusion region during etching is less than 20 [mu] m, and the biodegradation rate (ISO 14855, 90d) is more than 95%.

The present application relates to the application in the field of laser precision machining based on wafer level brittle hard material plane polishing method of femtosecond laser, comprising: shaping femtosecond laser into flat-top line spot with uniform energy to scan workpiece surface;In the process of machining, the OCT module integrated coaxially is used to obtain the interference signal of workpiece surface in real time;Real-time analysis of OCT axial scanning signal spectrum feature and / or attenuation slope is used as the diagnostic basis of subsurface damage risk;According to the diagnostic result, the laser energy density is reduced in real time and / or the energy distribution of the spot is dynamically modulated through the spatial light modulator to inhibit the subsurface damage.The present application realizes the real-time, in-situ diagnosis and active inhibition of brittle hard material subsurface damage in femtosecond laser machining, combines flat-top line spot and dynamic light field regulation, solves the problem of roughness deterioration in fine grinding stage, and can realize subsurface nanometer level surface finish, non-damage and high efficiency planarization machining.

This invention provides a laser-modified anti-corrosion method for the surface of a magnesium alloy phosphate film, comprising a nanosecond pulsed fiber laser, a pulsed laser beam, a magnesium alloy, a phosphate film, and a motion control platform. The method involves first preparing a manganese-based phosphate film on the magnesium alloy surface, then placing it on the motion control platform, and irradiating the phosphate film using a pulsed laser beam with specific parameters output from the nanosecond pulsed fiber laser. Finally, an epoxy primer is coated onto the modified surface. Under the ultrafast photothermal effect of the laser energy density, the loose hydrated phosphate undergoes in-situ dehydration and reconstructs into a dense anhydrous oxide layer, eliminating micropores and cracks. This invention significantly improves the hydrophilicity of the film surface, transforming the bonding mechanism between the film and the epoxy primer from a simple physical anchoring to a physicochemical synergistic bonding, greatly enhancing the geometric shielding effect and interface locking effect, achieving a substantial leap in the corrosion resistance of the magnesium alloy and the adhesion of the multilayer coating system.

The invention discloses a power regulation and control method for precise coupling of scanning vector length and energy density of a two-dimensional cross section in additive manufacturing. A laser energy density dynamic regulation and control strategy for coupling regulation and control of the scanning vector length and the laser energy density is adopted to prepare a two-dimensional variable cross section complex component in a layer-by-layer accumulation mode. In the forming process, according to the laser energy density dynamic regulation and control strategy, the scanning vector length serves as a minimum regulation and control unit, the laser power is regulated and controlled in real time according to different scanning vector lengths corresponding to different sections obtained by slicing the two-dimensional variable cross-section complex component, laser energy density input is controlled till the last layer is deposited, and printing is completed. Therefore, the purposes of improving the forming quality, linearly controlling technological parameters, effectively inhibiting defects and integrally forming complex components with high precision can be achieved.

The application discloses a kind of 3D printing data detection methods, it is related to 3D printing detection technical field, comprising the following steps: S1, the three-dimensional model to be printed is sliced and layered, obtains several two-dimensional cross section graphics;S2, to several two-dimensional cross section graphics is laser scanning printing, generates energy modulation term and molten pool dynamic modulation term, obtains the metal printing risk quantization value of each two-dimensional cross section graphic;S3, according to the metal printing risk quantization value of each two-dimensional cross section graphic, determines printing fault detection result.The application comprehensively considers laser energy density variation rate, powder layer thickness, laser effective area, molten pool solidification time and other key process parameters, the influence of energy input stability on unmelted risk is described by energy modulation term, the role of overmelting risk is reflected by molten pool dynamic modulation term, and the core influencing factors of printing quality are comprehensively covered, to provide more reliable basis for fault prediction.

This application relates to the field of laser ingot lift-off, specifically providing a method and apparatus for dual-laser beam ingot lift-off. The method includes the following steps: Step 1, fixing the ingot on a moving platform; Step 2, turning on the laser, with the laser beam irradiating the interior of the ingot; Step 3, the moving platform moving the ingot so that the laser-modified layer covers the entire ingot; Step 4, turning off the laser and removing the laser-modified ingot from the moving platform; The laser beams include a first laser beam and a second laser beam, with a fixed distance between them. The dual beams scan synchronously at a fixed interval, reducing laser energy density and processing time, weakening the objective lens thermal effect, and ensuring uniform thickness of the modified layer; this facilitates crack propagation, reduces edge chipping, and improves wafer yield; simultaneously, it reduces ingot material waste and lowers the unit cost of high-value wafers.

Disclosed in the present invention are a laser apparatus for subcutaneous focusing, and a method. The laser apparatus comprises a housing, a laser device and a focusing lens, wherein the laser device is accommodated in a hollow inner cavity of the housing and is used for emitting laser light; and the focusing lens is used for implementing subcutaneous focusing on the laser light, so as to form a focused light spot at a preset subcutaneous position. The energy density of a collimated light beam of the laser device is lower than a preset skin damage threshold value. By using laser light, the energy density of which is below the skin damage threshold value, to irradiate the skin surface, the safety of the skin surface is ensured; and by means of further optical focusing and when the increase amplitude of laser energy density at the focal beam waist position exceeds the laser energy attenuation amplitude, the laser energy density at the subcutaneous focal beam waist position greatly exceeds the skin damage threshold value, causing subcutaneous recoverable burns, and thus stimulating the tissue repair function and improving the skin condition.

The invention belongs to the technical field of optical materials and photonic devices, and discloses chalcogenide glass for a mid-infrared photonic device for femtosecond laser direct writing and a tuning method. According to the invention, chalcogenide glass GeSbSNa is used as a substrate, and femtosecond laser beams are focused in the glass substrate; and controlling the central wavelength of the femtosecond laser to be 1030 nm, the pulse duration to be 100 fs to 1 ps, the repetition frequency to be 100 kHz and the scanning speed to be 1 mm / s, so that the laser energy density of the focusing region is enough to induce a modification region with the refractive index change delta n greater than 0.032 in the chalcogenide glass. The invention systematically evaluates the influence of composition and laser parameters on refractive index variation, phase offset and thermal stability. Through combination of a quantitative phase microscope and a Raman spectrum, optical modification and underlying structure transformation are associated, and an insight is provided for adjustability and toughness of GeSbSNa glass in MIR photon integration.

This invention belongs to the field of laser precision machining and robot control technology, and relates to a method and system for controlling the laser machining process of a robotic arm based on laser signal feedback. The method simultaneously acquires coaxial photoelectric detection signals of the molten pool, joint coding data, and theoretical interpolation coordinates. By transforming the spectrum of the detection signals and filtering out plume radiation interference, geometric parameters characterizing the shape evolution of the molten pool are obtained. The spatial vector difference between the physical coordinates of the machining head and the theoretical interpolation coordinates is calculated to determine the transient tracking error and map it to obtain a power attenuation coefficient. This coefficient is used to reduce the transient laser output power in real time, physically aligning the real-time laser energy density with the actual movement speed of the robotic arm's end effector. By establishing a physical constraint on the energy output to mechanical servo hysteresis, this invention solves the time scale mismatch problem between microsecond-level photoelectric response and millisecond-level mechanical response, effectively eliminating local heat accumulation on the machining path and maintaining the steady state of the molten pool.

The invention discloses a self-adaptive control method and system for laser marking of a wiring terminal shell, and relates to the technical field of laser processing and intelligent manufacturing, and the method comprises the steps: obtaining surface image information, extracting initial surface state data, building a mapping relation between laser energy density and shell surface change, and building an initial marking control model; setting an initial control value according to the initial marking control model; marking information of the marking area is collected and subjected to fusion processing, and comprehensive marking state data is generated; outputting a real-time marking quality error and a change rate thereof according to the comprehensive marking state data, and obtaining an adjustment direction and amplitude of the laser data under a preset physical constraint condition; according to the adjustment direction and amplitude of the laser data, the physical constraint conditions are dynamically corrected in combination with historical marking data, and an optimal laser data combination is output; according to the method, through surface state self-adaption and historical data optimization, the problems of uneven laser marking quality and batch difference are solved.

The application provides a gun steel surface Cr coating and a preparation method thereof, and relates to the technical field of surface modification of metal materials. The application uses pure Cr powder as cladding powder, and adopts a laser cladding coaxial powder feeding method to perform laser cladding on gun steel. The laser cladding coaxial powder feeding is to simultaneously and synchronously perform coating cladding by using a laser beam channel and an alloy powder channel of a coaxial powder feeding nozzle. The powder and the gun steel substrate are both melted. Cr2O3 reinforcing phases are synthesized by using in-situ reaction and atomic diffusion in a molten pool, so that the coating has stable wear resistance from room temperature to 600 DEG C. Meanwhile, the Fe in the substrate penetrates into the Cr to form a solid solution phase Cr-Fe, which increases the toughness of the substrate and reduces the crack tendency, and the coating is more compact. In addition, the application has high environmental protection and high efficiency, the equipment is simple, the quality is stable, and good economic benefits can be achieved.

The invention relates to the technical field of material ablation detection, in particular to a laser ablation area and position real-time prediction method based on a strain gauge array. Comprising the following steps: selecting a plate material and defining material parameters; arranging a circular strain gauge array on the plate material; defining ablation heat flux, laser energy density distribution and pulse time, forming a laser ablation solid-heat simulation model, and performing laser ablation simulation; collecting a time sequence signal Ti (t) of the temperature monitoring array, and recording the radius r (t) of an ablation hole and an ablation center coordinate (x0, y0); the laser irradiation center position and irradiation time parameters are changed, and a temperature-ablation area / ablation position database is formed; a kriging agent model is established, and the corresponding relation between the temperature changes of the temperature monitoring points of the material and the actual ablation area and position of the material under different laser irradiation schemes is obtained; and inputting temperature data acquired by the strain gauge array in real time into the kriging agent model, and predicting the current ablation area and specific position of the output material.

A method for treating presbyopia of a crystalline lens using a femtosecond laser system, operated in a parameter regime characterized by extremely short pulse duration (below 100 fs) and low pulse energy (sub-μJ) of the pulses delivered to the lens tissue. The laser beam has a small focal volume in the tissue that is achieved by the short spatial pulse length, rather than defined by the large depth of focus resulting from the low numerical aperture of the laser beam. The laser energy density within the small focal volume (below 50 μm3) is sufficiently high to induce optical breakdown of the tissue, which reduces the Young's modulus of the lens to improve accommodation, thereby reducing presbyopia. Meanwhile, the total pulse energy in the focal volume is sufficiently low, resulting in small cavitation bubbles, which reduce light scattering and other damage or undesirable effects in the treated lens tissue.