110 results about "Ktp laser" patented technology

The invention provides a laser plasma sound barrier and magneto-rheological antiknock array collaborative protection method. The method comprises the following steps: firstly, constructing a collaborative protection structure consisting of a laser plasma sound barrier layer and a magneto-rheological antiknock array layer; a shock wave leading signal is detected in real time and input into a preset multi-dimensional feature model, the model dynamically generates a protection strategy, and a sound barrier instruction and an anti-explosion instruction are output respectively. The laser plasma sound barrier layer outputs specific reverse sound waves according to a sound barrier instruction and attenuates shock waves through destructive interference; meanwhile, the magneto-rheological anti-explosion array layer instantaneously solidifies a magnetic field according to an anti-explosion instruction, and shock wave energy is efficiently absorbed. According to the laser plasma sound barrier and magneto-rheological anti-explosion array cooperative protection method provided by the invention, the cooperative protection structure and the preset multi-dimensional feature model are constructed, so that the cooperative effect of the sound barrier and the anti-explosion array is realized, the response speed to shock waves is increased, the energy processing efficiency is improved, and the adaptability and reliability of protection are enhanced.

The invention relates to the technical field of capacitor films. The invention discloses a preparation process of a high-performance polypropylene capacitor film. The preparation process comprises the following steps: A1, preparing a polypropylene capacitor film; a2, carrying out surface cleaning and activation pretreatment on the polypropylene capacitance film; a3, evaporating a gradient modified layer on the surface of the pretreated polypropylene capacitance film; a4, carrying out laser plasma synergistic treatment and crystallinity regulation and control on the modified polypropylene capacitor film; and A5, coating the outer layer of the modified polypropylene capacitance film with a functional layer, and carrying out annealing post-treatment to prepare the high-performance polypropylene capacitance film. The mechanical strength and the electrical stability are improved through nano filler dispersion, two-way stretching and crystallinity regulation and control; through the collaborative design of surface cleaning and activation and a gradient functional layer, excellent interface bonding force and environmental adaptability are given; and by means of technologies such as multi-source evaporation and laser plasma co-processing, precise regulation and control and diversified expansion of the performance are achieved, the method is suitable for various scenes, and the process repeatability is good.

An easy-to-adjust X-ray source enhancement system based on a cascaded high-density structure comprises a linear gas nozzle, a metal target, a fixed sleeve, a fixed rod and a three-dimensional mobile platform, and can effectively generate a two-stage high-density structure to enhance radiation of a betatron X-ray source. The device has the advantages of simplicity in operation, compact structure, generation of two-stage high-density structure distribution and good stability. The invention relates to the field of interaction of ultra-short and ultra-strong laser plasmas, in particular to a process of accelerating and driving high-brightness X-rays by laser tail field electrons, in the first stage, generated density falling edges are used for generating electron injection, and stable generation of large-charge electrons is promoted. And the second stage utilizes the characteristics of the high-density platform region to enhance the lateral oscillation of electrons, thereby improving the X-ray radiation energy and photon yield.

The invention discloses an electromagnetic shielding case formed based on ultrafast laser plasma, and the electromagnetic shielding case comprises an ultrafast laser which is used for emitting ultrafast laser; the phase modulation element is used for carrying out annular modulation on the phase of the ultrafast laser to enable the cross section of a light beam to be in an annular shape; and the focusing device is used for pre-focusing the annular modulation light emitted by the phase modulation element in air to form a hollow cylindrical plasma cylinder, and the plasma cylinder is used for being nested at the periphery of equipment to be shielded so as to realize a signal shielding effect. Therefore, the generation and dissipation process of the ultrafast laser plasma is very rapid and can be completed on the nanosecond-level time scale, rapid response to electromagnetic waves can be achieved, and the method is suitable for occasions where the shielding effect needs to be dynamically adjusted.

The invention relates to the technical field of photoetching machine chip manufacturing. The invention relates to a method for changing wavelength of light waves by adding a deuterium medium to a photoetching machine. The method is characterized by mainly comprising a glass container (1) and deuterium (2). Light sources such as laser pass through the deuterium (2) in the glass container (1), the deuterium (2) and the light sources such as laser generate resonance, and the resonance generates light with shorter wavelength.

The present invention relates to a laser precision adjustment device, comprising: a first power source, an output end of which is used to provide a driving force for moving along a first direction; a linkage module, which is connected to the output end of the first power source and has multiple connecting parts, and the multiple connecting parts are driven by the first power source to move at equal intervals along the first direction; multiple support plates, with one support plate correspondingly connected to one connecting part; multiple mirror modules, with one mirror module installed on a support plate and comprising a reflector group and a galvanometer, the reflector group being used to receive and reflect laser light emitted by the laser module, and the galvanometer being used to receive reflected light from the reflector group and perform precision compensation; the multiple connecting parts are equidistantly moved in the first direction to realize equidistant adjustment of multiple lasers, and the laser light is highly precisely compensated in the galvanometer after being reflected by the reflector group, so that the product yield is high, the production capacity is high, the structure is relatively simple, it is easy to operate, the maintenance cost is low, the debugging is convenient, and the long-term operation stability is high.

The invention discloses a laser plasma additive composite welding device which comprises a workbench, a moving mechanism, a composite welding assembly and a rolling device, the moving mechanism comprises a transverse moving device, a longitudinal moving device, a vertical moving device and a portal frame, and a mounting part is arranged on a movable part of the vertical moving device; the composite welding assembly and the rolling device are arranged on the installation part at intervals, the composite welding assembly comprises a laser welding head and a plasma welding head, the rolling device comprises a support, a roller part and an elastic part, the upper portion of the support is connected with the installation part, the lower portion of the support is movably connected with a movable strip, and the movable strip is provided with a rotating shaft for being rotationally connected with the roller part. The elastic piece acts between the support and the movable strip, and the roller piece is sleeved with a heat-resisting ceramic sleeve. According to the plate-shaped part repairing device, the pressing roller device is driven by the moving mechanism to move, and the repairing material is pressed into the molten pool in a rolling mode, so that the damaged area of the plate-shaped part is fully filled with the repairing material, and the quality of the repaired plate-shaped part is guaranteed.

This article is a polishing pad comprising a polishing layer and a cushioning layer laminated together. The partial design features a configuration in which a plate-shaped window made of a transparent material is fitted into a recess formed in the polishing layer, and the product is used by transmitting light such as laser light through the window.

The present application relates to a kind of adjustable thrust and specific impulse of multi-working substance mixed effect laser plasma micro-propeller, solid working substance supply system includes multiple solid working substance, wherein one solid working substance is located in the middle, the rest is uniformly arranged in the periphery of the solid working substance in the middle along the circumferential direction, each solid working substance is fixed on the installation base by fixed assembly B, the material of each solid working substance is two or more than two in metal, high molecular polymer, energy material;Laser system includes control power supply and multiple laser assembly, the number of laser assembly is same with the number of solid working substance, one-to-one correspondence, wherein one laser assembly is located in the middle, the rest is uniformly arranged in the periphery of the laser assembly in the middle along the circumferential direction.The present application can make the thrust and specific impulse generated by propeller can be adjusted in a large range by adjusting the independent action of laser and single solid working substance or the coupling effect of laser and multiple types of solid working substance, satisfy more complex space task.

This application provides a method, apparatus, and accelerator for generating a gas target, relating to the field of laser plasma accelerator technology. The method for generating a gas target includes placing a baffle plate at a gas outlet; accelerating a gas target material and ejecting it through the gas outlet to generate an oblique shock wave, thereby forming a gas target; and using a laser pulse to interact with the gas target to form a wake field composed of plasma, resulting in ionization injection, accelerated phase re-phase, and density gradient injection processes. This application captures accelerated electrons during the ionization injection process in the uniform density distribution section of the gas target, extends the acceleration distance by allowing the electron beam, which has reached a deceleration phase, to return to the acceleration phase during the accelerated phase re-phase process in the density rising section of the gas target, and increases the charge and transverse amplitude of the electron beam during the density gradient injection process in the density falling section of the gas target, thereby efficiently increasing the single-emittance number of Betatron X-rays.

The application relates to a kind of plasma diagnostic method and device based on femtosecond laser filament probe, belong to laser plasma diagnostic technical field, method utilizes the high peak power characteristics of femtosecond laser to form the femtosecond filament probe with only hundred microns in diameter and only several millimeters in length, and the internal substance of plasma can be excited again.Spectra signals when using and not using femtosecond filament probe are collected respectively, and the element information at the position of femtosecond filament probe at this moment is obtained by differentiating the spectrum.By scanning the relative position of femtosecond filament probe and plasma, the material content information at different spatial positions in plasma can be obtained, and by changing the delay time when femtosecond laser pulse and plasma are generated, the material distribution information in plasma at different time can be obtained, and the four-dimensional distribution information of the material in plasma can be obtained by coincidence of the spectrum under different positions and different delay times.

The invention relates to a technology for enhancing the cohesiveness of a carbon-carbon matrix and a SiC ceramic powder coating, and relates to the technical field of high-end brake materials, and the specific bonding steps are as follows: taking a carbon fiber preform plate as a raw material, placing in an isothermal chemical vapor deposition furnace, depositing for 150-200 hours at 1000-1100 DEG C and normal pressure, and increasing the density to 1.3 g / cm < 3 > to obtain a carbon / carbon composite material blank; according to the technology for enhancing the cohesiveness of the carbon-carbon matrix and the SiC ceramic powder coating, coating preparation is completed through three steps of CNC mechanical slotting, phenolic resin-SiC powder hot pressing and primary fusion siliconizing, and laser / plasma surface modification or 1-5 [mu] m isotropic carbon transition layer deposition needed in the prior art is completely replaced; equipment is simplified from a laser / plasma or high-temperature CVD (Chemical Vapor Deposition) system to a conventional CNC (Computer Numerical Control), a hot press and a siliconizing furnace, and the investment of a single production line is reduced by more than 30%; the production period is shortened from 7-10 days to 2-3 days, manpower and energy consumption are synchronously reduced, the unit cost is reduced by 25%-40%, and low-cost and large-scale industrial production is truly achieved.

The invention provides a mold sticking excess material cleaning device and method. The mold sticking excess material cleaning device comprises a heating table, a supporting rod, a mold table and a scraping piece. The bottom end of the supporting rod is connected with the side face of the heating table. The mold table is arranged above the heating table. The mold table is of a frame structure, and the bottom face of the side face of the mold table is connected with the top face of the heating table. And the scraping blade is connected with the upper end of the supporting rod. When the mold sticking excess material cleaning device is used for cleaning mold sticking excess materials, the scalding risk does not exist, safety and effectiveness are achieved, and operation is convenient and fast; the die surface cannot be damaged, and the service life of the die is prolonged; extra conditions such as mold cleaning glue and laser are not needed, the structure is simple, and the cost is low.

The invention provides an image bright field correction method and device for a laser plasma accelerator, electronic equipment and a storage medium, and relates to the technical field of X-ray imaging. The method comprises the following steps: acquiring dark fields and initial X-ray beam spot images of an X-ray bright field calibration detector and an X-ray imaging detector to obtain coordinates of an initial X-ray beam spot center; under the condition that the imaging sample is moved in, a real-time unprocessed X-ray beam spot image obtained by the X-ray bright field calibration detector and a real-time unprocessed projection image obtained by the X-ray imaging detector are obtained, so that a real-time beam spot image and a real-time imaging image are obtained, and coordinates of a real-time X-ray beam spot center are obtained; according to the coordinate difference between the real-time X-ray beam spot center and the initial X-ray beam spot center, the X-ray beam spot center is obtained, and a final real-time projection image is obtained. According to the invention, the accuracy of bright field correction is improved by measuring the X-ray beam spot in real time and combining geometric space mapping and coordinate transformation.

The utility model discloses a laser obstacle removing device, which relates to the technical field of laser equipment, and comprises an optical ranging aiming lens, a laser emission lens, an electric holder and a control panel, and the optical ranging aiming lens and the electric holder are respectively arranged at the top and the bottom of the laser emission lens. The optical ranging aiming lens is used for measuring the distance between the laser obstacle removing device and a target, a distance signal is used as a focusing parameter to guide the laser emitting lens to focus, the optical ranging aiming lens transmits a target image back to the control panel, and the laser emitting lens is used for bearing input and output of high-energy laser. The focus of a laser beam is adjusted through a distance signal of an optical ranging aiming lens, the electric holder has the rotating freedom degree in the horizontal direction and the vertical direction, the functions of system rotation, aiming, laser focusing and emitting and the like are achieved through a control panel, and the problems that a laser obstacle removing device is complex in structure, not attractive in appearance, incomplete in function and high in practicability are solved. And the operation is troublesome.

A laser-plasma synergistic surface treatment method for CFRP / titanium alloy heterojunctions belongs to the field of heteromaterial bonding technology. First, nanosecond pulsed lasers are used to etch the surfaces of CFRP and titanium alloy to be bonded, constructing a micro-nano composite structure. Then, atmospheric pressure cold plasma is used to activate the etched surfaces, grafting polar functional groups. Finally, the two are bonded and cured using an adhesive. This invention achieves a dual enhancement effect of "mechanical interlocking" and "chemical bonding" by organically combining "laser etching to construct micro-nano physical structures" and "plasma activation to introduce chemical functional groups," significantly improving the interfacial bonding strength of CFRP / titanium alloy heterojunctions. Compared with single treatment methods, this invention can increase the joint shear strength by more than 38%, and the failure mode changes from interfacial failure to cohesive failure. It has advantages such as environmentally friendly process, good controllability, and significant effects, and has broad application prospects in aerospace, high-end equipment manufacturing, and other fields.

The invention discloses a device and a method for testing transmission of electromagnetic waves in an ultrafast laser plasma channel. The device comprises a linear antenna, a signal generating device and a signal receiving and analyzing device, the linear antenna adopts a coaxial copper inner core; the two linear antennas are arranged at the two ends of the ultrafast laser plasma channel respectively, one linear antenna serves as a transmitting antenna, and the other linear antenna serves as a receiving antenna; the signal generating device is connected with the transmitting antenna and used for transmitting electromagnetic wave signals. The signal receiving and analyzing device is connected with the receiving antenna; wherein the electromagnetic wave signal is transmitted to the signal receiving and analyzing device through the transmitting antenna, the ultrafast laser plasma channel and the receiving antenna in sequence, and the signal receiving and analyzing device is used for analyzing the transmission characteristics of the electromagnetic wave signal of the to-be-detected wave band in the ultrafast laser plasma channel. Therefore, the process of transmitting the electromagnetic waves by the plasma channel can be conveniently analyzed, and the transmission test efficiency of the electromagnetic waves in the ultrafast laser plasma channel is improved.

Protective eyewear that may provide a full field of view while shielding users from unsafe, harmful, or unwanted visual elements, including high-intensity sources such as lasers, is described. Such shielding may include, for instance, capturing, attenuating, transforming, filtering, and / or otherwise processing such unsafe, harmful, or unwanted visual elements for presentation to users. The protective eyewear may enhance visual elements, such as by increasing brightness or contrast. The protective eyewear may allow users to see visual elements outside their normal or expected range such as ultraviolet and infrared. The protective eyewear may include one or more cameras that may capture visual information associated with the user environment. The captured information may be analyzed and processed such that harmful or unwanted visual elements are removed and / or otherwise processed to be made safe for viewing. After processing, the captured information may be rendered and provided via a display of the protective eyewear.

The invention discloses a controlled aerosol laser-induced breakdown spectroscopy detection method and device, and relates to the technical field of laser plasma emission spectroscopy. The method comprises the following steps: placing a to-be-detected sample with fixed mass in a closed cavity filled with inert gas; ablating all the to-be-detected samples in the closed cavity by using laser with fixed wavelength, mixing ablated to-be-detected sample particles with inert gas to form aerosol with uniform mass density, and exciting the aerosol to form plasma; the plasma spontaneously emits light; one or more of pressure intensity, double-pulse excitation and resonance excitation in the closed cavity are regulated and controlled, so that the intensity of light emitted by the plasma is enhanced; and obtaining the content of the to-be-analyzed element in the to-be-detected sample according to the intensity-enhanced plasma emitted light. According to the method, the influence of the matrix effect on the laser-induced breakdown spectroscopy technology can be reduced, and the quantification accuracy is improved.

This invention provides a frequency-domain shaping laser-plasma resonance sintering system using aerosol jetting. The localized strong electromagnetic field excited by LSPR can induce electron cloud rearrangement and chemical bond reconstruction at the interface of adjacent nanoparticles, forming an atomic-level interdiffusion transition layer. This invention precisely controls the laser wavelength through frequency-domain shaping technology to match the LSPR characteristic peaks of the nanoparticles, maximizing the local electromagnetic field enhancement effect. This allows for the completion of nanoparticle melting and necking formation at ultra-low laser power, overcoming the energy efficiency limitations of traditional post-processing techniques such as high-temperature furnace heating. Simultaneously, this process is completed within the femtosecond to picosecond timescale, avoiding component segregation caused by high-temperature thermal diffusion and significantly improving the bonding strength of the nanoparticle interface. Furthermore, it achieves nanoscale selective heating, completing particle melting and necking formation at ultra-low laser power, avoiding overall thermal damage.

The invention relates to a preparation method and application of a self-repairing conductive pattern of a polydimethylsiloxane substrate, amino silicon oil (PDMS-NH2) is used as a main material, a metal salt is added, the amino silicon oil is cross-linked and cured, and a PDMS material containing metal particles is formed. Wherein the metal salt and the amino silicon oil (PDMS-NH2) form metal coordination, so that the self-repairing function of the PDMS is improved, and the metal particles can be further reduced into metal simple substances by means of laser, plasma and the like, so that active sites are provided for chemical plating reaction, and a conductive image with self-repairing capability is formed on the surface of the PDMS through the chemical plating reaction. The preparation method has the advantages of being simple in preparation process, short in technological process, low in equipment investment, high in cost performance, recyclable and the like, and can be widely applied to preparation of conductive interconnection patterns of intelligent electronic products such as foldable screen electronic devices, flexible sensors and wearable devices.

This article is a polishing pad comprising a polishing layer and a cushioning layer laminated together. The partial design features a configuration in which a plate-shaped window made of a transparent material is fitted into a recess formed in the polishing layer, and the product is used by transmitting light such as laser light through the window.

The invention relates to a polarization-adjustable ultra-short and ultra-strong intermediate infrared pulse system, and the system comprises a laser light source which is used for generating incident laser, and the incident laser is a beam of linear polarization laser; the plasma unit is used for providing a plasma environment for transmitting the incident laser; the magnetic field generating unit is used for providing a magnetic field magnetized in a single direction for the plasma environment; an included angle is formed between the polarization direction of the incident laser and the magnetization direction of the magnetic field; the incident laser is based on a plasma environment magnetized in a single direction, and circular polarization mid-infrared pulses are generated by utilizing a relativistic magnetic birefringence effect or a Faraday effect. According to the scheme, the intermediate infrared pulse with adjustable polarization, relativistic strength, few periods and long wavelength can be generated through interaction of the linear polarization laser and the single-direction magnetized plasma. And the high quality of the pulse is maintained, and meanwhile, the accurate regulation and control of the mid-infrared pulse polarization state are realized.

The present application relates to the field of micro-nano fluid, in particular to a cavitation bubble periodic generation method based on laser plasmon effect. The method uses continuous wave laser in plasmon resonance wave band, which is focused by a microscope objective and irradiated to the surface of a fused quartz sample covered with noble metal nanoparticles placed in liquid water environment; the laser spot is positioned near the solid object on the sample surface in advance, and the laser is turned on, the laser with power exceeding the threshold value will induce micron-scale cavitation bubble nucleation, growth and collapse at the laser spot position; the solid object near the laser spot as the flow field boundary will make the bubble produce movement towards the solid object during the collapse process, so that the bubble nucleus after collapse is pinned out of the laser spot area; the laser spot area is covered by liquid again, and under the condition of continuous laser energy input, cavitation bubble nucleation can be induced again at the laser spot position, thus forming a high-frequency, periodic cavitation bubble nucleation, growth and collapse process. The operation of the present application to realize the periodic generation of cavitation bubbles is very simple and easy to realize, can produce strong disturbance to the local fluid, and can realize the control of the generation frequency, size, periodic generation area range size of cavitation bubbles.

The utility model relates to the technical field of optical lenses, and discloses a collimating lens lens, which comprises a first lens, a second lens and a third lens which are coaxially arranged and are sequentially arranged from left to right, a first gasket is arranged between the first lens and the second lens, a second gasket is arranged between the second lens and the third lens, and a third gasket is arranged between the second lens and the third lens. The first lens is a convex-concave type lens, the first lens, the second lens and the third lens are all plastic lenses, the second lens is a concave-concave type lens, and the third lens is a concave-convex type lens. Detection light such as infrared light and laser can be refracted into parallel lines and then emitted to the outside, so that an optical lens of the sweeper can clearly see dust, foreign matters and the like on the ground, and the recognition accuracy of the sweeper on external obstacles and objects can be improved.

The application relates to a linear sweep frequency laser generating device, which comprises a semiconductor laser, a driving circuit, a laser beam splitter, a laser frequency discriminator unit, a radio frequency signal generating unit and a laser frequency shift unit; the semiconductor laser is controlled by the driving circuit to generate sweep frequency laser, and is divided into two beams by the laser beam splitter and enters the laser frequency discriminator unit and the laser frequency shift unit respectively; the laser frequency discriminator unit extracts a nonlinear sweep frequency component of the sweep frequency laser and generates a control signal to control the radio frequency signal generating unit; the radio frequency signal generating unit generates a radio frequency signal with a frequency opposite to that of the nonlinear sweep frequency component according to the control signal to drive the laser frequency shift unit; the laser frequency shift unit modulates the frequency of the radio frequency signal on the input light frequency to offset the nonlinear sweep frequency component of the sweep frequency laser and output linear sweep frequency laser. Compared with the prior art, the application has the advantages of high sweep frequency rate, large sweep frequency range and linear sweep frequency laser.

A kind of synchronous timing control system for strong laser plasma interaction experiment, including a femtosecond laser device, a square wave signal generator, a jet signal synchronizer, three delay timers, a 12-way signal synchronizer, two shutter controllers, a YAG laser, a jet controller, multiple experimental acquisition instruments including an electron spectrometer, a rear imaging CCD, a spectrometer CCD.The present application is mainly applied to the field of strong laser plasma interaction, which can accurately control the interaction time of femtosecond laser pulse and nanosecond gate plasma channel, and accurately control the start acquisition time and acquisition duration of various experimental data, improve the signal-to-noise ratio, and the whole timing system is very easy to adjust.The present application also has strong expansibility, when ionized gas is not needed to form plasma channel, the 1Hz pulse signal timing of the right half of the dashed line can be removed, so that the interaction time of femtosecond laser pulse and millisecond gate jet gas can be accurately controlled.The expansibility of the present application is also reflected in that enough output ports have been reserved, and suitable functional elements can be connected subsequently.

The invention relates to the technical field of trenchless engineering, and discloses a long-distance heat distribution pipeline pipe-jacking track control system for complex geology, which comprises an ultrashort pulse laser used for generating a stable laser plasma channel along a pipe-jacking design axis as an absolute linear reference; the track correction module is used for correcting the accumulated error of the inertial navigation unit on line according to the detection result of a position sensitive detector on the pipe jacking machine on the channel; the sensing array self-calibration module is used for carrying out on-line self-calibration of three-dimensional coordinates on the distributed optical fiber earth sound sensing array laid along the line by using acoustic shock waves generated during channel generation; and the geological feed-forward module is used for processing the tunneling vibration signal by using the calibrated sensing array to generate a front geological model. According to the method, the problems of inertial navigation error accumulation and insufficient geological prediction capability are solved, and the precision and stability of long-distance pipe jacking track control are remarkably improved.

The invention discloses a metasurface-based holographic alignment system, which belongs to the technical field of holographic optics and comprises an observation system, a holographic alignment system shell, an illumination light system and a metasurface holographic reticle, the illumination light system comprises a semiconductor laser, a 1 / 4 wave plate and a reflector; the metasurface holographic reticle is a transmission-type metasurface and is provided with a hologram which uses a metasurface technology and can generate a holographic alignment pattern. The holographic alignment system based on the metasurface is not limited by optical reflection characteristics of a target surface, can work stably in an extreme environment, can provide high-precision and real-time space attitude perception and alignment guide, can overcome inherent defects of existing alignment methods such as laser, and is high in practicability. And the assembly automation level and reliability under complex working conditions are improved.

The invention relates to a plasma diagnosis method and device based on a femtosecond laser filamentation probe, and belongs to the technical field of laser plasma diagnosis, the femtosecond filamentation probe with the diameter of only hundreds of microns and the length of only several millimeters is formed by using the high peak power characteristic of femtosecond laser, and substances in plasma can be excited again. Spectral signals when the femtosecond filamentation probe is used and when the femtosecond filamentation probe is not used are collected respectively, and element information at the position of the femtosecond filamentation probe at the moment is obtained by differentiating spectrums. The relative position of the femtosecond filamentation probe and the plasma is scanned to obtain the substance content information at different spatial positions in the plasma, and the substance distribution information in the plasma at different moments can be obtained by changing the delay time of the femtosecond laser pulse and the plasma generation moment. And conforming the spectrums at different positions and at different delay times to obtain four-dimensional distribution information of the substances in the plasma.