112 results about "Laser damage" patented technology

The invention provides a high-energy laser damaged material surface temperature monitoring system and method.The high-energy laser damaged material surface temperature monitoring system comprises a high-energy laser light source, a homogenizing optical fiber beam expanding system, a material sample fixing system and a material surface temperature monitoring system, and laser generated by the high-energy laser light source is output after being homogenized and expanded by the homogenizing optical fiber beam expanding system; the output homogenized high-energy laser acts on an irradiation target material sample after beam expansion, the material surface temperature monitoring system comprises a high-precision target acquisition system, a binocular vision imaging system and a multispectral wavelength temperature measurement system, and the target acquisition system is used for acquiring infrared heat radiation on the surface of a laser irradiation material; the binocular vision imaging system is used for realizing three-dimensional thermal imaging of the laser irradiation target material sample piece according to the collected infrared thermal radiation, and the multispectral wavelength temperature measurement system is used for realizing three-dimensional temperature measurement of the laser irradiation target material sample piece according to the three-dimensional thermal imaging. By applying the technical scheme of the invention, the technical problem that three-dimensional temperature monitoring is difficult to realize in the prior art is solved.

The invention belongs to the technical field of 3D printing, and particularly relates to a continuous pulse mixed type patterning laser powder bed light path system and method.Laser powder is preheated to be close to a melting point but not molten through set continuous-period light emitting, the preheated laser powder is completely molten through pulse-period light emitting, and in other words, the continuous pulse mixed type patterning laser powder bed light path system and method are obtained; continuous light is only used for preheating powder for a short time, so that the powder is close to a melting point but not molten; then peak energy is rapidly provided through microsecond pulsed light, powder melting is completed instantly, in this way, the effective heating time is shortened, the heat radiation range of heating is controlled, the heating time of a system is far shorter than the heating time of traditional continuous light, melting and solidification are completed when heat is not diffused out of a preset pattern in time, and the production efficiency is greatly improved. Therefore, the fusion area is limited within the pattern range, the subsequent part forming precision is improved, and laser loss caused by too high peak power due to short time is reduced through pulse light emitting and continuous light emitting.

The invention discloses an all-silicon-based medium optical thin film and an all-fiber laser, and relates to the technical field of optical thin films, the number of layers of the optical thin film is 15, and the structure of the optical thin film is ML (HL) 6M; h represents high-refractive-index material silicon hydride or amorphous silicon, L represents low-refractive-index material silicon oxide, M represents high-refractive-index material silicon nitride, (HL) 6 is a 12-layer reflecting film stack, and ML and M respectively form anti-damage film stacks on two sides. On the premise that the thickness is reduced and the anti-laser-damage effect is improved, effective adaptation of a middle-infrared band pumping source is achieved, and the problems that an existing optical thin film is large in thickness, poor in anti-laser-damage effect and incapable of effectively adapting to the middle-infrared band pumping source are solved; and secondly, electric field distribution can be optimized, so that the optical thin film has more excellent spectral performance. And thirdly, the laser can be directly deposited on the optical fiber end face to serve as an endoscope, and the technical problem that an existing optical fiber laser is complex in structure is solved.

The invention relates to the technical field of ultrafast laser, in particular to an ultraviolet laser damage inhibition method and device for a fused quartz optical element, and the method comprises the steps: obtaining oxy-18 modified DKDP crystals with oxy-18 isotope abundance higher than natural abundance; preparing the oxy-18 modified DKDP crystal into a wave plate matched with a preset ultraviolet laser wavelength; in an ultraviolet laser light path of a laser inertial confinement fusion device, a wave plate is arranged between a linear polarization state output end of ultraviolet laser and a fused quartz optical element; and enabling ultraviolet laser to sequentially pass through the linear polarization state output end and the wave plate to form circularly polarized light, and irradiating the circularly polarized light to the fused quartz optical element. The invention aims to realize the small-scale self-focusing effect of actively inhibiting fused quartz and solve the technical problem that a traditional material cannot be used as a large-aperture wave plate due to over-high transverse stimulated Raman scattering.

The application provides a low-laser-damage back contact heterojunction solar cell manufacturing method, which comprises the following steps: A, a first conductive type film layer is arranged on a part of a first main surface of a semiconductor substrate to form a first conductive region of the first conductive type, and the specific method of the step A is as follows: a1, a first conductive type film layer, a first insulating layer and a laser absorption sacrificial layer are sequentially formed on the first main surface of the semiconductor substrate; a2, the laser absorption sacrificial layer in a region other than the first conductive region is removed by laser etching; and a3, the first insulating layer and the first conductive type film layer not covered by the laser absorption sacrificial layer are removed by chemical etching to form the first conductive region with the insulating film layer attached to the surface. The application aims to provide a low-laser-damage back contact heterojunction solar cell manufacturing method, which can reduce laser damage, reduce the influence of thermal decay and improve photoelectric conversion efficiency.

The invention discloses a method and a device for determining a laser damage index of an optical fiber tunnel and electronic equipment. The method comprises the following steps: acquiring a plurality of working condition scenes corresponding to an optical fiber tunnel; determining laser temperature parameters respectively corresponding to the plurality of tunnel areas; determining transmission attenuation indexes respectively corresponding to the plurality of working condition scenes; determining a plurality of spatial distances respectively corresponding to the plurality of optical fiber devices; and according to the laser temperature parameters corresponding to the plurality of tunnel areas, the transmission attenuation indexes corresponding to the plurality of working condition scenes, and the plurality of spatial distances corresponding to the plurality of optical fiber devices, determining a laser damage index corresponding to the optical fiber tunnel. According to the method and the device, the technical problem that the laser damage index of the optical fiber tunnel is determined inaccurately when the laser damage index of the optical fiber tunnel is determined in related technologies is solved.

The application relates to the technical field of fiber gratings, and discloses a preparation method of a large-area fiber grating and the fiber grating. The method is to make a glass tube with a refractive index close to that of a fiber coating adhere to the fiber under the action of high temperature by using the collapsing glass tube method, so that the femtosecond laser damage threshold of the fiber boundary is improved, the writing area of the fiber grating is increased, and even the modulation area introduced by the femtosecond laser can cross the two areas of the fiber and the glass tube, so that the fiber grating covering the whole cross section of the fiber is prepared. Meanwhile, the refractive index of the glass tube is close to that of the coating, so that the mode deformation and loss are not caused.

The invention provides a long-wave infrared laser reflector with a three-medium structure. The long-wave infrared laser reflector structurally comprises a substrate Sub, a transition layer B, a metal layer G, a medium film system C and an air layer A from bottom to top. The dielectric film system C is structurally characterized by being formed by alternately stacking one or more groups of materials with high, medium and low refractive indexes. The invention aims to realize high reflection of a long-wave infrared band. Through meticulous design, three kinds of materials with high, medium and low refractive indexes are reasonably distributed in the reflector. According to the strategy, the absorption of the reflector is effectively reduced by balancing the low absorption of the chalcogenide and the low refractive index of the fluoride, the temperature rise caused by heat absorption is remarkably reduced, and meanwhile, the reflectivity is improved. Therefore, the continuous laser damage threshold value of the reflecting mirror is greatly enhanced theoretically, and the reflecting mirror shows higher stability and tolerance when facing continuous laser irradiation.

The application provides a magnetic field enhanced coupling plasma processing device and method, which comprises a capacitively coupled plasma device and a racetrack magnetic pole device; the capacitively coupled plasma device comprises an upper anode plate and a lower cathode plate, a plasma working area is formed between the upper anode plate and the lower cathode plate, and an electric field is formed between the upper anode plate and the lower cathode plate; the racetrack magnetic pole device comprises a moving device and a racetrack magnetic pole installed on the moving device, the moving device drives the racetrack magnetic pole to move along a plane parallel to the lower cathode plate; the racetrack magnetic pole comprises adjacent permanent magnets with opposite magnetic poles, and the permanent magnets form an additional coupling magnetic field which restricts the bipolar diffusion motion of electrons in the electric field. The application modulates the density, distribution and directional drift of the multi-field coupled plasma, greatly improves the actual processing efficiency of difficult-to-process materials, makes the plasma rapid processing of medium-large aperture optical elements possible, and improves the laser damage resistance of the elements.

The present application relates to laser damage detection, in particular to a kind of laser damage automatic judging method based on computer vision, the laser radiation before image of the element to be measured is collected, and the image after laser radiation, and the image before laser radiation, the image after laser radiation are preprocessed;Determine the region of interest in the image before laser radiation, the image after laser radiation based on the possible damage location of the element to be measured, and adopt sliding window and move along the region of interest in the image before laser radiation, the image after laser radiation simultaneously;Similarity index between corresponding local window image in each sliding window is calculated based on similarity measurement model;Similarity index is input into classifier, and whether the element to be measured appears laser damage is judged according to the output result of classifier;The technical scheme provided by the present application can effectively overcome the defects that the prior art cannot accurately, efficiently judge whether optical element appears laser damage, and intuitively reflect laser damage detection result.

The present application relates to the technical field of solar cells, and discloses a solar cell and a preparation method therefor, and a photovoltaic module, used for solving the problem in the prior art of the photoelectric conversion efficiency of shingled solar cells being affected due to the passivation performance and other performance of shingled solar cells being affected by laser damage areas of the shingled solar cells. The solar cell comprises a first surface and a second surface opposite to each other, and a side surface connecting the first surface and the second surface. The side surface comprises at least one first area, the at least one first area comprising a plurality of fused silicon areas, and a first texture area between at least two fused silicon areas.

The application discloses a self-limiting pipe end welding interface laser rust removal device, and relates to the technical field of laser rust removal.The device comprises a main frame, a clamping mechanism, an axial limiting assembly and a laser rust removal execution mechanism;the bottom of the main frame is provided with a fixed arc-shaped plate matched with a steel pipe, and a limiting plate is arranged at one end of the axial limiting assembly to realize axial self-limiting;the clamping mechanism is matched with an adjustable bolt through flexible deformation of an arc-shaped clamping piece, so that the device is quickly clamped and fixed on the steel pipe.The middle part of the main frame is provided with an operation window opposite to the surface of the pipe end to be rusted;the laser rust removal execution mechanism is matched with an arc-shaped limiting rail through a sliding support, so that the laser gun is driven to move along the circumferential track of the surface of the pipe end to be rusted accurately, and the laser focal point is stable.The device has compact structure and high portability, can realize quick positioning and uniform rust removal of the surface of the pipe end of the steel pipe to be rusted, reduces the difficulty of manual operation on site, avoids laser damage to the steel pipe base body, and effectively improves the efficiency and quality of rust removal before welding.

1. The name of the design product: large-format laser cutting machine protective cover (H4.0). 2. The use of the design product: used in the process of laser cutting protection, to avoid laser damage to the human body, while protecting the internal structure of the cutting machine. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The invention provides a method for measuring the minimum out-of-focus distance of a turbine blade with femtosecond laser critical damage, and relates to the technical field of femtosecond laser processing, and the method comprises the following steps: manufacturing a plurality of groups of different types of samples, and configuring a plurality of samples in each group of the same type; dividing each group of samples of different types into a group of distance test units; the femtosecond laser processing technology is utilized, based on the safe defocusing distance, the defocusing distance in each time of processing is gradually reduced until the defocusing distance in the last time of processing is zero, and femtosecond laser processing of the multiple sets of distance testing units under different defocusing distances is completed; according to the types of the samples, performing performance detection on the different types of samples subjected to femtosecond laser processing; and determining the minimum defocusing distance of the femtosecond laser damage sample according to a performance detection result. According to the method provided by the invention, filling protection in a blade cavity is unnecessary in the process of repairing the air film hole of the turbine blade of the aero-engine, so that the processing efficiency is improved, and the product quality is ensured.

The application relates to the technical field of optical detection equipment, and discloses a device and a processing method for testing the laser damage threshold of a sample, which can quickly and accurately lock the spot size when damage occurs. The method comprises the following steps: converting a received laser signal that has passed through a measured sample into an electrical signal output by means of a photoelectric detection module; amplifying the electrical signal output by the photoelectric detection module by means of a signal amplification module; performing peak detection and smoothing processing on the voltage signal output by the signal amplification module by means of a peak detection module to obtain a voltage signal representing the peak intensity of laser; outputting a high-level signal when the voltage signal output by the peak detection module is higher than a reference voltage by means of a voltage comparator configured in a same direction comparison mode in a voltage comparison module; and cutting off the power supply circuit of the motor to lock the spot size corresponding to the moment of power mutation by means of a lock module comprising a MOS tube connected in series in a motor on-off control circuit when the voltage comparator outputs a high-level signal.

The invention discloses a large-size KDP crystal growth simple continuous filtering growth device and a growth method, and belongs to the field of crystal preparation. The growth device comprises a crystal growth tank, a program temperature control water tank and a filtering system. The crystal growth tank is used for rapid and slow growth of KDP crystals under continuous filtration conditions, and can realize programmed cooling growth of the KDP crystals. The program temperature control water tank is used for heating the solution from the growth tank and filtering the growth solution in an overheated state, and the filtering system is used for filtering the growth solution in the overheated state and improving the cleanliness of the growth solution. Reducing the temperature of the filtered growth solution to the temperature of the growth tank, and enabling the growth solution to enter the growth tank for continuous growth to ensure the supersaturation stability of the growth tank. Under a continuous filtering condition, the optical performance of the grown KDP crystal is integrally improved, and particularly, the laser damage resistance threshold is improved by 2-4 times.

The invention relates to a seamless splicing grating, in particular to a method for manufacturing a seamless splicing grating based on a dynamic straight-edge diaphragm, which comprises the following steps of: aligning the edge of the dynamic straight-edge diaphragm with a splicing seam position mark on one side of a substrate, performing simple harmonic motion on the dynamic straight-edge diaphragm along the direction vertical to the splicing seam, realizing dynamic scanning and completing first interference exposure; the edge of the dynamic straight-edge diaphragm is aligned with the abutted seam position mark on the other side of the substrate, stripe locking is carried out by utilizing the grating latent image reserved by the first exposure, so that the dynamic straight-edge diaphragm carries out simple harmonic motion in the direction perpendicular to the abutted seam, dynamic scanning is realized, and second interference exposure is completed; carrying out unified development on the exposed substrate to obtain a photoresist grating mask without splicing seams, and transferring a grating structure on the mask to a dielectric substrate; according to the technical scheme, the defects that in the prior art, due to abutted seam modulation, the laser damage resistance is poor, and the machining difficulty is large can be effectively overcome.

This invention relates to a method for high-precision non-destructive evaluation of the laser damage threshold of crystals. The method includes: characterizing the defect states of the crystal under test using a photoluminescence testing system to obtain internal defect state information; testing the surface absorption characteristics of the crystal under test using a photothermal weak absorption testing system to obtain an absorption coefficient correction factor; inputting the defect state information and the absorption coefficient correction factor into a free electron density analysis model containing defect state terms to calculate the free electron density under laser irradiation conditions; calculating the temperature field distribution and thermal stress distribution of the crystal using an optical-thermal-mechanical multiphysics coupling analysis model based on the free electron density; and determining the laser damage threshold of the crystal under test based on the comparison results of the free electron density, temperature field distribution, and thermal stress distribution with a preset damage threshold. This invention achieves high-precision non-destructive evaluation of the laser damage threshold of crystals, significantly reducing testing costs and improving evaluation accuracy.

The invention relates to the technical field of composite material damage evaluation and performance prediction, and discloses a thermal-mechanical-chemical-electromagnetic coupling-based integrated calculation method for ablation damage and electromagnetic wave transmission performance of a quartz fiber reinforced composite material under laser irradiation. The method comprises the following steps: acquiring verification data through a laser ablation experiment and an electromagnetic wave transmission test, establishing a laser damage numerical model of the quartz fiber reinforced composite material, and correcting a simulation calculation result by using the verification data; secondly, extracting features in a simulation calculation result, performing electromagnetic wave-transparent numerical calculation based on an established electromagnetic wave-transparent performance numerical model, and verifying and correcting through experimental data again; and finally, a verified integrated calculation method is formed. According to the method, organic coupling and integrated prediction from physical and chemical damage to electromagnetic performance degradation are realized, the problems of model separation, excessive geometric simplification, dependence on high-cost experiments and the like in the prior art are solved, and the prediction precision, efficiency and engineering applicability are remarkably improved.

The invention belongs to the field of laser damage resistance evaluation methods, and relates to a method for evaluating laser damage characteristics of a crystal based on photo-thermal weak absorption. The method for evaluating the laser damage characteristic of the crystal based on the weak photo-thermal absorption comprises the following steps: firstly, carrying out nondestructive testing on the weak photo-thermal absorption on a to-be-detected crystal to obtain a weak absorption rate; and evaluating the laser damage resistance of the to-be-tested crystal according to an Exponential-Chapman function relationship by using the obtained weak absorptivity. The Exponential-Chapman function relationship is as follows: F = a (1-e-b alpha) c, a, b and c are all fitting coefficients, alpha is the weak absorption rate, and F is the energy density.

The invention discloses a metal halide nonlinear optical crystal and a preparation method thereof, and relates to a nonlinear optical crystal and synthesis preparation thereof. The invention aims to solve the technical problem that the existing method is difficult to synthesize the metal halide of the mixed anions. The chemical formula of the metal halide nonlinear optical crystal is Rb2CdCl2I2, the structure of the nonlinear optical crystal does not have a symmetric center, the nonlinear optical crystal belongs to an orthorhombic system, the space group is I4mm, and the cell parameters are that a is equal to 5.31210 (10), b is equal to 5.31210 (10), c is equal to 17.7062 (10) and Z is equal to 2. The crystal is prepared by using a solution volatilization spontaneous crystallization method at 33-37 DEG C, has the advantages of low growth temperature, high crystal purity, good crystal quality, broad band gap of 3.70 eV, high laser damage threshold of 19 * AgGaS2, and ultra-wide light transmission range of 0.35-103.2 [mu] m, and can be used in the field of infrared laser.

The application relates to the technical field of continuous laser optical film, in particular to a low-heat-effect laser film and a preparation method thereof. The method comprises the following steps: designing a film system according to laser wavelengths and optical performance and simulating and optimizing; precisely polishing a substrate, ultrasonic cleaning and activating; alternately preparing high and low refractive index functional layers and interface modification layers by physical vapor deposition and atomic layer deposition, setting the interface modification layers between the adjacent high and low refractive index functional layers, forming a periodic stacking structure; and annealing treatment under an inert atmosphere at 150-300 DEG C to obtain a finished product. The method has the advantages that: phonon bridging and interface passivation are realized through nano-Al2O3 interface modification, interface thermal resistance is significantly reduced, heat accumulation and thermal lens effect are inhibited, and the laser damage threshold is improved; the process is controllable, the film layer is dense and uniform, and the method is suitable for antireflection, high-reflection or light-splitting devices of high-power continuous laser systems.

The application discloses a preparation method of a TBC solar cell, which comprises the following steps: dipping a substrate into a specified solution at a predetermined temperature to perform texturing, and controlling the texturing time within a predetermined time; sequentially depositing a tunneling oxide layer and an intrinsic polysilicon layer on the back of the substrate; depositing a mask layer on the side of the intrinsic polysilicon layer away from the tunneling oxide layer; forming a first opening area on the mask layer, and performing boron diffusion on the first opening area to form a boron-doped polysilicon layer; forming a second opening area on the mask layer, and performing phosphorus diffusion on the second opening area to form a phosphorus-doped polysilicon layer; the mask layer remains between the first opening area and the second opening area; and depositing an anti-reflection layer on the back of the substrate. The application can shorten the production process and reduce the risk of laser damage to the cell.

This application discloses a diamond-like carbon (DLC) crystal material, its preparation method, and its application as an infrared nonlinear optical material, belonging to the field of crystal preparation technology. The DLC crystal material has a triclinic structure with the chemical formula AM5Q8; wherein A is selected from at least one of Na, K, Rb, and Cs; M is selected from at least one of Ga and In; and Q is selected from at least one of S, Se, and Te. This crystal material exhibits a frequency doubling effect 0.5-5 times that of AgGaS2 and a laser damage threshold 1-50 times that of AgGaS2, demonstrating significantly improved performance and making it a potential infrared nonlinear optical material.

A kind of testing device of photoelectric detector laser damage, comprising: laser, half-wave plate, 56 degree polaroid, 45 degree beam splitter, power meter, shutter, high-transmission high-reflection mirror, collimating light source, beam expander system, lens, 45 degree beam splitter, first light filter attenuation component, beam quality analyzer, mirror, sample control console where measured photoelectric detector is placed, first photoelectric detector, second light filter attenuation component, first beam splitter, beam splitter prism, photothermal detector, position-sensitive detector, imaging system, second beam splitter, probe light source, third light filter attenuation component, second photoelectric detector, oscilloscope and terminal control system;When using the present application, the laser damage test of photoelectric detector sensing / sensing part can be realized without disassembly, while adopting the fusion of double photoelectric detector, photothermal detector, position-sensitive detector and online imaging system, complementary advantages, realize the high-precision detection and measurement of detector damage signal.

A crystalline material processing method includes forming subsurface laser damage at a first average depth position to form cracks in the substrate interior propagating outward from at least one subsurface laser damage pattern, followed by imaging the substrate top surface, analyzing the image to identify a condition indicative of presence of uncracked regions within the substrate, and taking one or more actions responsive to the analyzing. One potential action includes changing an instruction set for producing subsequent laser damage formation (at second or subsequent average depth positions), without necessarily forming additional damage at the first depth position. Another potential action includes forming additional subsurface laser damage at the first depth position. The substrate surface is illuminated with a diffuse light source arranged perpendicular to a primary substrate flat and positioned to a first side of the substrate, and imaged with an imaging device positioned to an opposing second side of the substrate.

The invention discloses a system and a method for dynamically visualizing a flow field in a high-energy laser damage process, and relates to the technical field of laser damage effect detection.The schlieren method is applied to dynamic visualization of the flow field in a high-energy laser and high-speed airflow coupling scene for the first time, and by means of the schlieren method principle, a coaxial point light source lamp serves as a light source, and the dynamic visualization of the flow field is realized. Light beams emitted by the point light source pass through the schlieren mirror to be focused to the knife edge position of the blade, when the light beams penetrate through a to-be-measured flow field area, the light beams deflect due to the gas density gradient, flow field imaging is achieved through the light beam deflection caused by the gas density gradient, the light beams are cut into light beams with bright and dark stripes through the blade, and the light beams are focused to the knife edge position of the blade. According to the technical scheme, the light beam deflection and light beam cutting process is optically isolated, and the background radiation of the high-energy laser and the target material combustion flame is inhibited through the light filtering module, so that the flow field structure and the flow field flow state are clearly captured and distinguished through optical isolation and spectral filtering under the strong wide-spectrum radiation generated by the high-energy laser and the combustion flame.

The invention discloses a high-threshold high-anti-reflection laser window and a manufacturing method thereof, and belongs to the field of micro-nano optical processing. According to the method, traditional precious metal and high-temperature annealing processes are abandoned, and low-melting-point soft metal is adopted as an evaporation film material. The method comprises the following steps: heating an optical substrate to 80-200 DEG C in a vacuum environment, maintaining the temperature, and carrying out at least two times of cyclic deposition by utilizing an electron beam evaporation technology; in each deposition, metal is self-assembled on the surface of the heating substrate through a dehumidification effect to form spherical nano-particles, the particles continue to grow on an original array through subsequent deposition, and finally the spherical nano-metal mask with high uniformity and high filling degree is obtained. And etching by taking the mask as a protective layer, transferring the appearance of the mask to the surface of the substrate to form a micro-nano structure, and cleaning to obtain the laser window. The method is simple in process, low in cost and suitable for large-area manufacturing, and the obtained window has the high laser damage threshold value, the high transmittance and the self-cleaning surface characteristic.

The application discloses a kind of nano silver / SiC gradient composite laser protection coating and its step-by-step preparation method, belong to laser protection material technical field.Coating is from bottom to top in turn nano silver / SiC gradient layered composite reflection layer, chitinous whisker modified ablation layer;Reflection layer is double-layer directional component gradient structure, along the thickness direction nano silver content decreases, SiC content increases.Preparation time first gradient spraying reflection layer, by high-pressure pulse rapid in-situ sintering densification, avoid nano silver agglomeration;Then spray ablation layer, by hot air / infrared independent curing, solve the process compatibility problem.Coating 1.06 μm reflectivity is greater than or equal to 89%, laser damage threshold is greater than or equal to 1900W / cm², bonding strength is greater than or equal to 20MPa, thermal cycle life is greater than or equal to 20 times, suitable for military, aerospace and other fields of strong laser protection.