189 results about "Cw laser" patented technology

The invention discloses an underwater navigation positioning method and system based on supercontinuum laser intensity correlation. The system comprises a master control system, a transmitting end underwater base station and a receiving end underwater carrier. The method comprises the following steps: firstly, a main control system generates a super-continuum laser signal with pseudo-random code information, the super-continuum laser signal is separated into optical signals of different wavelength channels through a light splitting module, and the optical signals are respectively sent to underwater base stations uniquely corresponding to the wavelength channels and are emitted; then the underwater carrier receives optical signals from a plurality of base stations, identifies a signal source base station according to wavelength identification, performs correlation operation with a locally copied pseudo-random code sequence, determines signal arrival time TOA and calculates a pseudo-range; and finally, resolving the three-dimensional coordinate and local clock error result of the underwater carrier by combining the pseudo-ranges, absolute positions and transmission delays of the underwater carrier and the at least four base stations. According to the invention, high-precision and high-robustness absolute positioning of the underwater environment is realized, and the reliability of long-time positioning and navigation of the underwater robot is enhanced.

The invention discloses double-laser machining equipment and method for tool machining. The double-laser machining equipment comprises a tool clamping mechanism and a gantry mounting frame which are arranged on a workbench. The cutter clamping mechanism drives the cutter to rotate; the infrared continuous laser processing head and the purple picosecond laser processing head are respectively mounted on the gantry mounting frame through a lifting mechanism, an infrared continuous laser beam emitted by the infrared continuous laser acts on the cutter through the infrared continuous laser processing head, and a purple picosecond laser beam emitted by the purple picosecond laser acts on the cutter through the purple picosecond laser processing head; the cutter clamping mechanism, the lifting mechanism, the infrared continuous laser, the infrared continuous laser machining head, the purple picosecond laser and the purple picosecond laser machining head are all electrically connected with the controller. The infrared continuous laser and the purple picosecond laser are integrated in the same equipment, the cutter is modified through double-laser cooperation, dynamic adjustment of laser parameters is achieved in combination with the lifting mechanism and the controller, the heat influence is effectively reduced, and the machining quality stability is improved.

The quantum current transformer based on the optical fiber isolation microwave transmission comprises a high-voltage primary side which comprises a magnetic shielding ring and an NV color center magnetic sensing probe module, and a magnetic sensing probe is arranged in the magnetic shielding ring; at the low-voltage secondary side, the microwave system is used for generating radio-frequency signals in a preset frequency range and transmitting the radio-frequency signals to the NV color center magnetic-sensing probe module, the laser system is used for generating continuous laser and transmitting the continuous laser to the NV color center magnetic-sensing probe module, and the microwave system and the laser system are used in cooperation to drive the NV color center to generate fluorescence signals representing the magnetic field intensity. A fluorescence signal is transmitted to the data processing system to calculate to-be-detected current information; wherein the microwave system is connected with the NV color center magnetic sensing probe module through an optical fiber, the microwave system modulates the radio frequency signal into an optical signal, transmits the optical signal to the NV color center magnetic sensing probe module, and restores the optical signal into the radio frequency signal in the NV color center magnetic sensing probe module to be received. According to the transformer, stable transmission of microwave signals under the high-low voltage isolation condition is achieved, the design is reasonable and exquisite, and the measurement precision is high.

The invention discloses a welding method for titanium alloy thick plates, and relates to the technical field of laser welding, and the method comprises the following steps: placing a plurality of titanium alloy thick plates to be welded on a workbench, carrying out backing welding on backing welding areas of the titanium alloy thick plates to be welded, and carrying out continuous laser processing through picosecond pulse laser, reciprocating motion is conducted in the molten pool and the forging area; after the backing welding process is finished, a first laser wire filling welding area and a second laser wire filling welding area between different titanium alloy thick plates to be welded are welded in a laser wire filling welding mode, in the welding process, picosecond pulse laser follows continuous laser machining, and the welding process is completed. And reciprocating motion is conducted in the molten pool and the forging area according to a preset motion trail, so that different titanium alloy thick plates to be welded are welded. The technical effect that uneven distribution of the structure performance of the welding joint is avoided is achieved.

The invention discloses a method for cutting silicon nitride ceramic based on laser. The invention provides a method for cutting silicon nitride ceramic based on laser. The method comprises the steps that a silicon nitride ceramic mold to be cut is fixed to a workbench of a laser cutting device through a clamp; setting laser processing parameters; coating an absorbent on a pre-cutting area of the silicon nitride ceramic; according to the cutting path and the laser processing parameters, a laser of a laser cutting device is used for cutting the silicon nitride ceramic, and continuous laser is used for moving and cutting on the surface of the silicon nitride ceramic along the set path; and auxiliary gas coaxial with the light beam is used for blowing away molten substances, and a cooling effect is achieved, so that continuous kerfs are formed on the surface of the silicon nitride ceramic, the laser absorptivity of the ceramic can be increased, and the processing efficiency and quality of the silicon nitride ceramic are improved.

This invention relates to information technology. The purpose of this invention is to solve the problem of inaccurate measurement of time delay mismatch in current chaotic modular link systems. It provides a chaotic modular link delay testing system and method, the technical solution of which can be summarized as follows: A continuous laser is used as a test carrier, and this test carrier is split into two beams, one outputting to the chaotic modular link system under test; the other test carrier is mixed with the output of the chaotic decryption device of the chaotic modular link system under test at a 90° angle to achieve coherent detection with zero difference, obtaining a mixed optical field; the mixed optical field is then converted by photoelectric conversion to output a Q-component signal; the input Q-component signal is sampled at high speed, and a phase mismatch term is calculated; an autocorrelation operation is performed on the phase mismatch term to obtain a correlation curve; and the time delay corresponding to the second peak is calculated based on the correlation curve to obtain the measured time delay mismatch Δt. The beneficial effect of this invention is that it can quickly and accurately calculate the measured time delay mismatch Δt, and it is applicable to chaotic modular link systems.

The invention relates to a method and a device for regulating and controlling the structure performance of a nickel-based high-temperature alloy in pulse laser-assisted additive manufacturing, and belongs to the technical field of additive manufacturing. The method comprises the following steps: controlling the oxygen content in a sealed forming cabin of an LPBF forming device, and paving nickel-based high-temperature alloy powder on a substrate of the sealed forming cabin; and the pulse laser and the continuous laser are controlled to output laser beams, the pulse laser beams and the continuous laser beams are coupled in a polarization beam combination or wavelength beam combination mode, and after the focal length of the coupled laser beams is adjusted, the nickel-based superalloy powder on the substrate is subjected to fusion forming. According to the method, the pulse laser and the continuous laser are coupled into the coaxial light spots, in-situ synchronous disturbance on the molten pool in the LPBF additive manufacturing process is achieved, the solidification behavior of the nickel-based high-temperature alloy can be accurately regulated and controlled, epitaxial growth of columnar crystals is effectively broken, formation of fine isometric crystals is promoted, and the yield of the nickel-based high-temperature alloy is improved. And the anisotropy and cracking risk of the material can be reduced.

The invention provides a high-precision voltage-stabilizing constant-current power supply for continuous discharge of a CO2 laser, which relates to the technical field of high-voltage voltage-stabilizing constant-current power supplies and comprises a high-voltage direct-current voltage-stabilizing power supply and a high-impedance amplification loop. The high-voltage direct-current voltage-stabilized power supply is boosted by a transformer, rectified by a rectifier bridge and stabilized by a filter capacitor, and continuously adjustable high-voltage output of 0-30kV is provided; the high-impedance amplification loop is composed of an operational amplifier, a three-stage triode amplification circuit and an electronic tube, the output impedance reaches up to 650 megohms, and the high-impedance amplification loop has the excellent constant-current characteristic. The power supply can accurately adjust the output current in the range of 0-30mA, the current fluctuation is less than one thousandth, the power supply can continuously and stably operate for more than 18 hours, and the power supply is suitable for laser discharge control in a high-temperature and high-density plasma environment. According to the invention, high-precision output is realized by adopting common performance devices, the advantages of voltage resistance, overload resistance and cost are considered, and the problems of poor current stability and inconvenient adjustment of a traditional laser power supply are solved.

This invention relates to the field of conductivity measurement technology, and more particularly to a high-temperature conductivity measurement system and method based on the eddy current method. The system includes a stage, a high-temperature eddy current probe, a moving device, a pyrometer, a laser heating subsystem, and a data measurement subsystem. The stage is used to place the sample to be measured. The high-temperature eddy current probe is used to receive an excitation signal and pick up the measurement signal. The moving device is used to move the high-temperature eddy current probe laterally above the sample. The laser heating subsystem emits a continuous laser in the near-infrared band to heat the sample. The data measurement subsystem generates a set of multi-frequency excitation signals to excite the high-temperature eddy current probe, determines the inductance changes corresponding to the multi-frequency excitation signals measured by the high-temperature eddy current probe at the same position above the sample, and calculates the conductivity of the sample based on the inductance changes. This invention enables accurate, non-contact measurement of the conductivity of materials under high-temperature conditions.

The invention relates to laser processing, and provides a laser melting and strengthening combined processing system which comprises a continuous laser device, a laser processing device, a laser processing device, a laser processing device and a laser processing device, and is characterized in that the continuous laser device is used for generating continuous laser beams and melting powder materials through a melting light path; the ultrafast laser is used for generating an ultrafast pulse laser beam and carrying out strengthening processing on the surface of the product subjected to melting processing through a strengthening light path; and the galvanometer assembly is used for receiving the continuous laser beam guided out by the melting light path and the ultrafast pulse laser beam guided out by the strengthening light path. The invention further provides a laser melting and strengthening combined machining method. According to the combined machining system, the continuous laser is firstly adopted for 3D printing, then the ultrafast laser is adopted for strengthening the printing surface, the mechanical strength of a printed piece can be effectively improved, the ultrafast laser and the continuous laser share the galvanometer assembly, and space arrangement of a printing cavity is facilitated.

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 wind speed detection device (1) comprises: an output unit (2) that outputs a CW laser (L) whose frequency is nonlinearly and periodically modulated; a branching unit (3) that branches the CW laser (L) into a measurement light (Lm) and a reference light (Lr); a measurement optical system (6) that outputs the measurement light (Lm) into the atmosphere and receives the scattered light (Lf) of the measurement light (Lm) in the atmosphere as a signal light (Ls); and a detection unit (8) that outputs a detection signal (D) based on the interference result of the reference light (Lr) and the signal light (Ls).

The invention belongs to the field of laser processing, and particularly relates to a device and a method for laser deposition of a nano-plating pattern on a flexible transparent base material, the device comprises a base, a target material supporting table used for installing a target material is arranged on the base, and a bearing substrate used for installing the flexible base material is arranged above the target material supporting table; the lower portion of the bearing base plate is connected with the base through a leveling mechanism, a tensioning mechanism is arranged on the bearing base plate and used for clamping and tensioning the flexible base material, and a laser projection area is arranged in the middle of the bearing base plate. The laser transmitter is arranged above the bearing substrate and comprises a first laser transmitter used for transmitting pulse laser and a second laser transmitter used for transmitting continuous laser; the detection device comprises a distance sensor and is used for detecting the distance between the base material and the target material; and the controller is electrically connected with the leveling mechanism, the detection device and the laser transmitter, is used for controlling the leveling mechanism according to a signal of the distance sensor, and is also used for controlling the laser transmitter to transmit laser. And uniform, efficient and rapid deposition of the nano coating is realized.

The invention provides a continuous and pulse coaxial double-beam welding method for a sheet titanium alloy corner joint process, and belongs to the technical field of laser welding. According to the method, continuous laser and pulse laser are adopted, coincidence arrangement of the two laser beams in space is achieved through a coaxial composite optical system to form a composite laser beam, the composite laser beam acts on a sheet titanium alloy corner joint assembled and fixed through a corner joint clamp, and the welding process is completed. The two laser beams are similar in wavelength, optical compatibility is good, and an optical system is stable. The coaxial composite heat source has the characteristics that the energy distribution gradient can be regulated and controlled, and the heat input is accurately controlled, so that the welding heat input can be effectively reduced while the mechanical property of the joint is ensured, and the residual stress is reduced to control the welding deformation. The sheet titanium alloy corner joint obtained through the method has the advantages of being uniform in welding seam forming, little in splashing, small in deformation and the like, and the technological requirements of the aerospace field for high-quality thin-wall titanium alloy structural parts are met.

The application discloses a kind of high surface quality laser additive and subtractive forming device and method, belong to laser additive manufacturing field including: continuous laser, for melting powder and formed entity realizes additive manufacturing;Pulse laser, for removing additive manufacturing parts slag, side powder adhesion or will be additive manufacturing parts nearby powder displacement;Beam time-sharing admission mechanism, for permitting continuous laser and pulse laser to carry out additive / subtractive machining;Galvanometer and optical path system, for expanding beam, collimation, deflection, focusing continuous laser and pulse laser according to the set path processing;Beam spatial position detection module, for realizing the high-precision coincidence of continuous laser and pulse laser in spatial position.The application adopts scanning galvanometer and F-theta mirror to solve the problem of part side powder adhesion in existing laser additive manufacturing, avoids the motion precision difference problem caused by multiple scanning galvanometers, effectively improves the surface quality and dimensional accuracy of laser additive manufacturing parts, meets the industrial application demand.

A laser assembly and a method for generating continuous-wave (CW) light at approximately 193 nm (between 180 nm and 200 nm) and at a power of 1W or higher using two CW laser sources: one laser source generating first fundamental light that is twice frequency doubled or otherwise converted into first CW light having a first deep-ultraviolet (DUV) wavelength between 250 nm and 275 nm, the other laser source generating second CW light having an infrared (IR) wavelength between 1300 nm and 1700 nm. A resonant cavity receives the second CW light and generates enhanced CW light at 100 W or higher. A first non-linear optical (NLO) crystal mixes a first enhanced CW light portion and the first CW light to generate sum-frequency generation (SFG) light having a second DUV wavelength. A second NLO crystal mixes a second enhanced CW light portion and the SFG light to generate output CW light at approximately 193 nm.

The invention is suitable for the technical field of laser measurement, and provides a detection device for corrugated paper and a corrugated paper machine. The detection device for the corrugated paper comprises a device main body, wherein the device main body comprises a storage platform and auxiliary brackets which are oppositely arranged; the laser emission module is arranged on the auxiliary bracket; the laser emission module is used for emitting continuous laser beams to the surface of corrugated paper, and the laser emission module adopts a double-beam synchronous emission structure; the laser receiving module is matched with the laser transmitting module, and the laser receiving module is mounted on the storage and loading platform; the laser receiver is used for receiving the laser signal transmitted or reflected by the corrugated paper and converting the laser signal into an electric signal; and the data processing module is used for receiving the electric signal output by the laser receiving module, and calculating to obtain a real-time thickness value of the corrugated paper according to the transmitting parameters of the laser transmitting module, the signal parameters received by the laser receiving module, the propagation characteristics of the laser in the corrugated paper and a preset multi-beam fusion algorithm.

The invention belongs to the technical field of metal material surface strengthening, and particularly relates to a preparation method of a multi-element ceramic strengthened metal-based composite laser cladding layer on a cast iron surface. The cladding material comprises a self-fluxing nickel-based alloy and a ceramic strengthening phase, the self-fluxing nickel-based alloy is a Ni60A alloy, and the ceramic strengthening phase is composed of W80Fe20 alloy powder and B4C ceramic powder. The preset powder is subjected to cladding through continuous laser, the laser power ranges from 4.0 kW to 6.0 kW, the scanning speed ranges from 100 mm / min to 400 mm / min, the light spot diameter ranges from 2.5 mm to 3.5 mm, and inert gas is introduced in the cladding process to serve as protective gas. And a tungsten-rich boride strengthening phase is formed in the cladding layer and is dispersed and distributed in the metal matrix, so that the cladding layer has relatively high microhardness and wear resistance. According to the method, the laser power, the scanning speed, the spot size and other process parameters are regulated and controlled, a compact cladding layer well bonded with matrix metallurgy is formed on the surface of the cast iron matrix, and the hardness and wear resistance of the cast iron are effectively improved.

This application discloses a semiconductor defect detection device and method, relating to the field of semiconductor defect detection technology. When detecting defects in a semiconductor sample, a first light source component emits a pulsed laser with photon energy greater than the bandgap of the semiconductor sample, exciting a first photoluminescence signal. Then, while maintaining the first light source component's pulsed laser emission, a second light source component emits a continuous laser with photon energy equal to the energy interval between the energy level and valence band of the target deep-level defect within the semiconductor sample, exciting a second photoluminescence signal. Based on these two photoluminescence signals, defect information of the semiconductor sample can be obtained. A synchronous optical path calibration module is used to detect the focused spot positions of the pulsed laser and the continuous laser on the surface of the semiconductor sample in real time, ensuring that the offset between the two focused spots is less than a preset threshold. This effectively reduces detection errors caused by spot offset and improves detection accuracy.

System and method of laser processing a section of web, or “strip” in a “step and repeat” manner while doing so with a continuously moving web during laser processing. The combination of continuous laser processing with a step and repeat manner of cutting parts from the strip, increases throughput for parts. The method includes retracting and indexing a web between passes of continuous laser processing of the web of material and alternating laser processing between two webs in a dual web system further increases throughput results from laser processing.

The application provides a method for improving the surface precision of a laser wire deposition component by femtosecond synchronization subtraction, comprising the following steps: S1, setting a double heat source, wherein the double heat source comprises a continuous laser and a femtosecond pulse laser; S2, establishing a three-dimensional geometric model of the additive manufacturing component by using computer-aided design software, and layering and slicing the three-dimensional geometric model by using slicing software; S3, discretizing the three-dimensional geometric model into two-dimensional contour data, and planning a scanning path of the continuous laser and a cutting path of the femtosecond pulse laser; S4, setting printing parameters of the continuous laser welding gun and cutting parameters of the femtosecond pulse laser welding gun; S5, according to the printing parameters of the continuous laser welding gun, depositing a metal wire according to the scanning path, and simultaneously, according to the cutting path, subtractively processing the surface of the additive manufacturing component by using the femtosecond pulse laser welding gun; and S6, repeating steps S4-S5 to complete layer-by-layer accumulation of the additive manufacturing component until a three-dimensional solid component is obtained.

This invention provides a novel scanning laser wind-measuring radar, employing a high-stability, narrow-linewidth semiconductor laser as the transmitting device. A high-speed optical switch precisely modulates the continuous laser in the time domain to generate ideal laser pulses. High-power amplifiers and low-noise amplifiers are used to enhance the transmitted power and echo signal quality, significantly compensating for the decrease in atmospheric echo power and improving range resolution and wind speed accuracy. The high-stability, narrow-linewidth laser improves the signal-to-noise ratio through a triple mechanism of increased coherence efficiency, reduced background noise, and sharpened spectral resolution, enabling long-range detection. When using a transceiver telescope system, it avoids a reduction in the scanning field of view due to a decrease in signal-to-noise ratio. The semiconductor laser solution is lighter than fiber lasers, suitable for airborne platforms, and enables miniaturized laser wind-measuring radar equipment. Furthermore, the high-stability, narrow-linewidth semiconductor laser used meets temperature and vibration stability requirements, ensuring the long-term reliability of the wind-measuring radar in field environments.

This invention discloses a method for CO2 continuous laser cutting of CFRP material. The method employs a CO2 continuous laser engraving and cutting system to cut CFRP material. After adjusting the corresponding working parameters, a portion of the CFRP material to be cut is taken as a sample, and a rectangle is obtained through trial cutting. The diameters of the pits generated by the spot laser are measured horizontally and vertically twice, and the average diameter is calculated. Simultaneously, the continuous laser power density is calculated, and the height difference between the four corners and the center of the rectangle is measured to obtain the surface fluctuation value (Fv). Different scanning speeds, number of consecutive processing cycles, and Z-axis scale values ​​are selected, and trial cutting is repeated on the sample. When the measured Fv is at its minimum value, the thermal damage to the material is minimized. The scanning speed, number of consecutive processing cycles, and Z-axis scale value at this minimum value are used as the working parameters for cutting the CFRP material. This invention effectively controls the thermal damage to the CFRP material during processing and improves the processing effect of laser-processed CFRP material.

The invention belongs to the technical field of laser radars, and particularly discloses a multi-dimensional target motion state detection system and method. Comprising the following steps: applying a frequency modulation continuous wave signal to continuous laser to form a modulation optical signal, and superposing the modulation optical signal to a conjugate OAM mode, so that an output composite light beam has a linear frequency modulation characteristic and a spiral phase structure at the same time; performing optical beam splitting on the echo signal reflected by the target to respectively form a first channel signal and a second channel signal; performing beat frequency interference on the first channel signal and local reference light, and extracting a Doppler frequency shift component related to a target radial speed through coherent detection; performing direct detection on the second channel signal, and extracting a low-frequency beat frequency component related to a target angular velocity based on beat frequency interference between conjugate OAM modes; and respectively calculating the angular velocity and the radial velocity of the target based on the low-frequency and high-frequency spectrum decoupling. According to the invention, accurate decoupling of Doppler frequency shift of the composite moving target is realized, and the method has high real-time performance and high adaptability.

The present application relates to the technical field of pattern recognition, in particular to a blood glucose detection region selection method based on blood perfusion imaging, comprising collecting continuous laser speckle original images of a to-be-detected skin region and a peripheral pulse wave signal of a subject, and constructing a bottom layer data matrix. The image sequence is converted into a perfusion contrast evolution sequence by calculating the ratio of the standard discrete degree and the average brightness of the pixel intensity in the three-dimensional data block. Frequency locking operation is performed using the main frequency of the pulse wave to separate out the perfusion fluctuation component synchronized with the heart beat rhythm, and the phase lag distribution map of each pixel point is determined through cross-correlation time delay analysis. The tissue damping coefficient of each pixel point is obtained by combining the tissue viscoelasticity kinetic damping model inversion, and the pixel set in the target response interval is screened and clustered according to the mapping relationship between the blood glucose concentration and the damping coefficient to determine the blood glucose detection target region. The present application realizes the locking of the detection region through tissue damping characteristic inversion and clustering screening.

The invention relates to the technical field of laser light sources, in particular to a Kerr-dissipation soliton optical frequency comb light source excitation device. The device comprises a pump light source module, an optical fiber gain filtering module, a spatial light adjusting module and an optical fiber Fabry-Perot microcavity module, the pump light source module is used for generating a first optical signal; the optical fiber gain filtering module is used for gaining the first optical signal into a second optical signal; the second optical signal is continuous pump light; the spatial light adjustment module is used for performing light beam adjustment on the second light signal to obtain a third light signal; the third optical signal is a fixed polarization line polarization bandwidth optical signal; and the optical fiber Fabry-Perot micro-cavity module is used for performing frequency domain filtering processing on the third optical signal to obtain single-frequency continuous laser, and autonomously exciting the dissipative Kerr soliton optical frequency comb light source through the single-frequency continuous laser. According to the scheme, the problems of high cost and complex control of a traditional soliton micro-comb system are solved.

The application provides a wind measurement laser radar system and method based on quantum interference, a laser provides pulsed laser and continuous laser; the pulsed laser is emitted to a target airspace and a backscattering signal is received; the continuous laser is divided into first and second interference local oscillation lights; the second interference local oscillation light is adjusted to obtain quantum interference local oscillation light with intensity in a set proportion to the intensity of the backscattering signal; the backscattering signal is switched to a classical or quantum interference detection channel; classical interference detection data are obtained in the classical interference detection channel, and first wind speed information data are calculated according to the classical interference detection data; first and second single-photon detection data are obtained in the quantum interference detection channel, and second wind speed information data are calculated according to the first and second single-photon detection data; the first and second wind speed information data are spliced and spline interpolated to supplement the missing wind speed information data caused by the response time of the optical switch, and the wind speed information of the target airspace is obtained.

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 invention discloses an automatic mode-locking pulse laser with a multi-pulse switching function and a switching method thereof, a pumping source injects pump light into an annular cavity of the laser through a wavelength division multiplexer, and in the annular cavity, a gain medium absorbs the pump light to generate continuous laser and performs gain amplification on received specific polarized light; the polarizer converts the received continuous laser or the specific polarized light after gain amplification into corresponding linearly polarized light; the electric polarization controller converts the received linearly polarized light into specific polarized light; pulsed light formed when optical signals in the annular cavity are circularly transmitted to achieve balance is output out of the annular cavity through an optical coupler, and the pulsed light is converted into time domain pulse signals after being subjected to time domain stretching; and adjusting three first voltages provided for the electric polarization controller and a second voltage provided for the pumping source according to the time domain pulse signal and the expected pulse number, thereby realizing switching of the corresponding number of pulses.