356 results about "Fiber laser" patented technology

The invention discloses a three-dimensional cutting dynamic parameter adjusting system and method based on deep learning, and relates to the technical field of application of three-dimensional five-axis fiber laser cutting machines in the automobile manufacturing industry, and the three-dimensional cutting dynamic parameter adjusting system comprises a multi-mode sensor cluster, an edge calculation unit, a closed-loop control module and an AI model library, the multi-mode sensor cluster collects cutting data, the edge calculation unit receives the multi-mode sensor data and outputs dynamic adjustment parameters, and the closed-loop control module transmits the dynamic parameters to the laser generator and the five-axis motion controller through a high-speed communication bus to form a'sensing-decision-execution 'closed loop. The cutting state and risk are sensed in real time by designing a multi-mode sensor for collaborative decision, the problems that manual experience depends on and dynamic response lags are solved, the reject ratio is reduced, and the response speed is increased.

The invention relates to the technical field of laser control, and discloses a 920nm femtosecond pulse fiber laser system based on a neodymium-doped fiber. The system comprises a seed laser source system, a pre-chirp system, an amplification system and a compression system, the output end of the seed laser source system is connected with the input end of the pre-chirp system, the output end of the pre-chirp system is connected with the input end of the amplification system, and the output end of the amplification system is connected with the input end of the compression system. Through a pre-chirp management method, the seed pulse can simultaneously realize the improvement of the pulse energy and the violent broadening of the spectrum in the amplification process. And a wider spectrum can obtain a narrower pulse width after being subjected to time domain compression. The narrower the width of the pulse means that the energy is more concentrated, so that the peak power of the laser pulse output after compression is higher, and the problem that narrow pulse width and high energy output cannot be simultaneously realized in the 920nm wave band in the existing fiber laser technology is solved.

The invention belongs to the technical field of laser application, and discloses a feedback type multi-wavelength optical fiber laser shaping and amplifying system which comprises a laser light source, an optical fiber frequency doubling device and a laser shaping and amplifying mechanism. The laser shaping and amplifying mechanism comprises a laser shaping and amplifying branch or more than two laser shaping and amplifying branches which are arranged in sequence; the laser shaping and amplifying branch comprises a feedback type laser shaping device and an optical fiber gain amplifying device; the optical fiber frequency doubling device is used for carrying out selective frequency conversion on fundamental frequency laser output by the laser light source; the feedback laser shaping device is used for carrying out waveform shaping on target wavelength laser; and the optical fiber gain amplification device is used for performing gain amplification on the shaped target wavelength laser. The device has the advantages of being simple in structure and high in expansibility, is suitable for being used in an optical fiber laser application system, and is used for modulating laser frequency, improving multi-wavelength laser waveforms and improving multi-wavelength laser output energy.

The invention discloses a multi-core all-solid-state anti-resonance optical fiber and a multi-wavelength optical fiber laser system. The multi-core all-solid-state anti-resonance optical fiber comprises an inner cladding area, at least two fiber core structures arranged in the inner cladding area and an outer cladding area or a coating layer area arranged on the periphery of the inner cladding area. Each fiber core structure comprises a fiber core area and an anti-resonance area, the anti-resonance area is composed of at least one capillary tube group, each capillary tube group comprises a plurality of capillary tubes, and the capillary tubes in each capillary tube group are annularly arranged on the periphery of the fiber core area by taking the fiber core area as the center; the optical fiber matrixes filled in the capillaries in the anti-resonance area are the same, and the refractive index of the anti-resonance area is n3gt; the refractive index n2 of the inner cladding region is equal to the refractive index n1gt of the fiber core region; and the refractive index of the outer cladding region or the coating layer region is n4. The optical fiber provided by the invention is beneficial to high-density integration of a fiber core structure in a multi-core optical fiber, has a large mode field area and a high-order mode rejection ratio, and gives consideration to both high power and high light beam quality.

The invention discloses an underwater multi-wavelength composite laser welding deformation self-adaptive regulation and control device and method. The device comprises a control system, an underwater multi-wavelength composite laser welding system, a double-optical-fiber-semiconductor laser composite welding head and a deformation monitoring system. The method is characterized in that a double-fiber-semiconductor laser composite welding head outputs a laser beam to act on a weldment, a semiconductor short-wave laser large light spot preheats a material, an optical fiber long-wave laser performs underwater high-energy deep penetration welding, and the stability of a molten pool is enhanced through cooperation of the two. The control system controls the deformed curved surface by adaptively adjusting swinging parameters of the fiber lasers on the two sides, and the parameters are adjusted according to deformation of different degrees to ensure that the height of the deformed median surface is reduced. According to the method, the swing parameters of the optical fiber laser beams are adjusted through underwater multi-wavelength hybrid welding to change the energy distribution characteristics of the near-welding-seam area, real-time optimization of stress deformation in the welding process is achieved, and the problems that after an underwater laser welding structural part is welded, stress concentration and deformation are large, and the welding seam strength is insufficient are solved.

The invention relates to a planning method, device and equipment for treating brain glioma through multi-fiber laser ablation. The method comprises the following steps: according to pre-acquired image information of a target patient and a segmentation result of a tumor region, sequentially performing segmentation sampling processing on the image information to obtain a candidate optical fiber path set; screening the candidate optical fiber path set according to an optical fiber planning objective function and an optical fiber planning constraint condition to obtain an intermediate optical fiber path set, and determining the number of optical fibers required by tumor ablation according to the intermediate optical fiber path set; determining a target optical fiber path set from the intermediate optical fiber path set according to the number of optical fibers required by tumor ablation and a predetermined path evaluation score; the target optical fiber path set at least comprises position information corresponding to each target optical fiber path. The method can improve the tumor ablation rate and reduce the use of optical fibers.

The invention discloses an optical fiber laser pipe cutting machine and an operation method.The optical fiber laser pipe cutting machine comprises a machine body, a first chuck, a second chuck and a laser cutting mechanism are installed on the machine body, and the first chuck and the second chuck are used for clamping a pipe and can drive the pipe to rotate; the machine body is fixedly connected with a pair of sliding rails matched with the first chucks, the straightening machine further comprises a fixing box, a plurality of straightening mechanisms and a force eliminating mechanism, each straightening mechanism comprises a plurality of hydraulic cylinders, the hydraulic cylinders are circumferentially and evenly fixed to the inner wall of the fixing box, and piston rods of the hydraulic cylinders are fixedly connected with pressure bearing parts. According to the optical fiber laser pipe cutting machine and the operation method, bent circular pipes can be pressed to be straight, the rejection rate is reduced, the pipes can be prevented from colliding with the laser cutting mechanism, the maintenance cost is reduced, meanwhile, the stress of the pipes can be eliminated, the pipes are prevented from being bent in the cutting process, and the cutting quality is guaranteed.

A high-power single-frequency laser amplifier based on prepared YAG derivative optical fibers comprises a single-frequency optical fiber laser seed source, the output end of the single-frequency optical fiber laser seed source is connected with the input end of a first-stage pre-amplifier, and the output end of the first-stage pre-amplifier is connected with the input end of a second-stage pre-amplifier. The output end of the secondary preamplifier is connected with the input end of the high-power double-cladding circulator, and the output end of the high-power double-cladding circulator is connected with a signal light input port of the high-power pumping signal beam combiner. The output end of the high-power pumping signal beam combiner is connected with one end of a specially prepared large-mode-field low-NA double-cladding rare earth doped YAG derivative optical fiber, and the other end of the large-mode-field low-NA double-cladding rare earth doped YAG derivative optical fiber is connected with the input end of the cladding light filter. The problem that expansion and diffusion of a fiber core in the YAG derived optical fiber are not controlled is solved, and therefore the theoretical power limit of single-frequency optical fiber laser amplification conducted through a silica optical fiber at present is broken through.

The invention discloses a feedback system for active polarization control of fiber laser and a non-polarization-maintaining fiber laser system, and relates to the field of fiber laser. The feedback system comprises an electric detection array sampling module, a calculation feedback module and a programmable gate array, the electric detection array sampling module extracts a fundamental mode component from a sampled main light beam, and N * N fundamental mode electric signals of the main light beam are obtained; the calculation feedback module inputs convergence parameters of the polarization convergence algorithm to the programmable gate array; and under the control of the calculation feedback module, the programmable gate array drives the non-polarization-maintaining fiber laser system to perform real-time polarization control by using a polarization convergence algorithm according to the feedback signal and the convergence parameter by taking the average value of the fundamental mode electric signals at the preset position in the N * N fundamental mode electric signals as the feedback signal. The polarization extinction ratio and the control bandwidth of polarization control can be improved.

The invention relates to the technical field of fiber laser cutting, in particular to a high-precision fiber laser metal plate cutting method and system, and the method comprises the following steps: obtaining an original capacitance value of a capacitive induction ring; the original capacitance value of the capacitive induction ring is separated into an average capacitance value and a high-frequency vibration signal; extracting a vibration amplitude from the high-frequency vibration signal; according to the non-linear relation between the capacitance value and the distance of the capacitive induction ring, the vibration amplitude and the average capacitance value, direct current deviation caused by high-frequency vibration is calculated; subtracting the direct current deviation from the average capacitance value to obtain a corrected average capacitance value; and controlling the distance between the nozzle and the metal plate according to the corrected average capacitance value. And the cutting quality and the size precision can be improved.

The invention provides a method for repairing photovoltaic aluminum profile H13 die steel through self-fluxing alloy powder. The method comprises the steps that (1) the self-fluxing alloy powder is prepared; (2) the H13 die steel to be repaired is subjected to surface cleaning and decontamination, annealing treatment and preheating; (3) adjusting parameters of an optical fiber laser cladding system, and feeding the self-fluxing alloy powder into a laser acting area of the optical fiber laser cladding system; in the laser scanning process, a laser beam heats a local area into molten alloy liquid; (4) the alloy liquid is conveyed to the surface of the H13 die steel to be repaired, and a laser beam and the alloy liquid interact to form a firm cladding layer; protective gas is introduced to help the self-fluxing alloy powder flow; (5) gradient cooling is conducted after stress relief annealing is conducted on the cladding layer, and a high-precision numerical control grinding machine is used for finishing and polishing; and repairing is completed. When the self-fluxing alloy powder is used for repairing the H13 die steel, the repairing quality can be improved, the performance of the repaired H13 die steel can be remarkably improved, the production cost is reduced, and the service life of the H13 die steel is prolonged.

The invention relates to a light-weight high-power pumping source which comprises a shell and N sets of pumping light chips installed in the shell in a partitioned mode, N is an integer larger than or equal to 1, and each set of pumping light chips comprises a corresponding coupling mirror set. Each group of pump light chips is used for emitting pump laser with different wavelengths, the pump laser is subjected to beam shaping through the respective corresponding coupling mirror group and then is coupled to the output optical fiber through the output mirror group, and the shell is made of a graphene reinforced aluminum-based composite material. On one hand, excellent mechanical performance and stability are kept, and on the other hand, the density of the fiber laser is far lower than that of oxygen-free copper, so that the weight of a pumping source under unit power is effectively reduced, and the whole fiber laser system is lighter and easier to install and maintain; meanwhile, the multi-wavelength pump light chip is introduced, the wavelength distribution of the pump light is optimized, the pump light is made to better conform to the absorption characteristic of the ytterbium-doped optical fiber, the thermal load of the ytterbium-doped optical fiber is effectively dispersed, the threshold value of the mode instability effect is remarkably increased, and therefore the power output capacity and the long-term operation stability of an optical fiber laser system are improved.

The present invention belongs to the field of laser cutting technology, and in particular discloses a fast fiber laser cutting machine device, including a shell, a laser head is arranged inside the shell, a slide is connected to the top of the laser head by a manipulator, the side of the slide is connected to the output end of the first cylinder by transmission, and the first cylinder is fixedly installed on the inner wall of the shell, a top rod penetrating the slide is fixed inside the shell, a bracket is arranged inside the shell, and the bracket includes a plurality of vertical plates. The present invention enables the first cylinder and the second cylinder to work synchronously through a controller, at which time the laser head is at the top of the inner frame, the inner frame is used to collect waste generated by laser cutting, and the elastic force of the torsion spring and the elastic member is used to make the convex strip pull the card plate, so that the inner frame can be stably placed inside the slide frame; the card plate is quickly separated from the convex strip, so that the inner frame and the slide frame can be quickly separated, and the inner frame can be quickly replaced to avoid excessive accumulation of waste inside the inner frame.

The invention provides a fiber laser interference vibration measurement method and device, and relates to the technical field of fiber laser interference vibration measurement. The laser is divided into reference light and measuring light through the 1 * 2 coupler, the measuring light is divided into multiple paths through the 1 * N coupler, the multiple paths of light are irradiated to the same measuring point from multiple directions through the circulator and the collimation / focusing optical element, a redundant light return channel is constructed, and the light return success rate and interference stability under a rough surface or a curved surface or a diffuse reflection surface are effectively improved. The return light and the reference light are superposed in the interference unit to form interference fringe signals, high-precision vibration displacement data are extracted through signal detection and three-phase demodulation, and the method is suitable for non-contact vibration measurement scenes which are low in cost and easy to deploy.

The invention discloses an optical fiber direct connection atomic spectrum frequency locking device. The device comprises an atomic gas chamber, an error signal acquisition device, a locking device and a coupling light generation and modulation device which are connected through an optical fiber. The coupled light generation and modulation device generates coupled laser which contains a radio frequency modulation signal and has a wavelength of 509 nm. The atomic gas chamber receives the coupling laser and the detection laser with the wavelength of 852 nm, in the atomic gas chamber, the detection laser is divided into reference light and signal light, and the signal light and the coupling light are oppositely transmitted through the atomic gas chamber to generate a Rydberg atomic spectrum. The error signal acquisition device detects the signal light and the reference light and generates an error signal. And the locking device generates a radio frequency modulation signal and locks the coupling light output frequency according to the error signal. The invention also comprises a method for using the device. According to the device and the method, the problems that an all-fiber laser light source frequency locking device for Rydberg atom preparation is complex and poor in effect are solved.

The invention relates to the technical field of laser control, and discloses a laser control method and device for an ultra-pulse thulium-doped fiber laser operation system, and the method comprises the steps: generating a PWM time-base waveform through an FPGA, and generating a reference duty ratio instruction based on a target pumping current value; the total response delay time of the acousto-optic modulator is calculated, the FPGA sends a trigger pulse to the acousto-optic modulator according to the total response delay time, the gated modulation laser is output to the optical fiber output end to obtain an analog voltage signal, and the analog voltage signal and the numerical value of the target power register are used for calculating a duty ratio correction increment; the duty ratio correction increment and the reference duty ratio instruction are updated to a duty ratio register of a PWM time base waveform, and multiple paths of pump cooperative driving waveforms are output. The technical problems of pump current response lag, acousto-optic modulator triggering jitter and optical power nonlinear saturation in an ultra-pulse thulium-doped fiber laser operation system are solved; and the laser pulse energy stability, the response speed and the long-term reliability are improved.

The invention relates to the technical field of non-linear regulation and control, in particular to a non-linear regulation and control method for a high-power narrow-linewidth multi-tone fiber laser system, which comprises the following steps: analyzing an influence mechanism of key parameters in the multi-tone fiber laser system on a non-linear effect; on the basis of the analyzed influence mechanism, establishing a nonlinear kinetic equation for describing the interaction of the pump wave, the stokes wave and the sound wave by combining a three-wave coupling theory, and forming a nonlinear propagation model; designing a Tab-DDPM generation network based on a nonlinear propagation model, and modeling a reverse mapping relation between a performance index and a design parameter by using a conditional diffusion mechanism to realize prediction of an optimal parameter; and inputting the optimal parameter into the nonlinear propagation model for verification, extracting an actually output performance index, and comparing the actually output performance index with a set target index to realize nonlinear performance evaluation and closed-loop optimization regulation and control. According to the method, the output capability and the signal fidelity of the high-power fiber laser system are effectively improved, and the method has good generalization capability.

The invention relates to the technical field of ceramic fiber board production, in particular to ceramic fiber laser cutting equipment which comprises a machine body, a laser cutting assembly is installed on the machine body, feeding structures are arranged on the two sides of the machine body, lifting structures are connected between the feeding structures and the machine body, a driving structure is arranged on the side face of the machine body, and a vibration structure is arranged in the middle of the machine body. A collecting structure is arranged on the inner side of the oscillation structure, and a transmission structure is connected between the oscillation structure and the driving structure; material plates with different shapes and thicknesses can be accurately pushed through the feeding structure, the thickness and the width of the plates can be conveniently adjusted through the lifting structure, the plates can be conveniently input while the device is driven through the driving structure, the plates can be conveniently collected through the oscillation structure, and the device is convenient to use. The cut plates can fall more intensively through the collecting structure, and the moving groove can be driven to continuously vibrate through the transmission structure so as to separate chippings.

The invention belongs to the technical field of fiber laser, and discloses a galvanometer lens bonding calibration device and a bonding calibration method.The galvanometer lens bonding calibration device comprises an optical screen, a bonding unit and a laser emitting unit, the optical screen is provided with a preset qualified area, and the bonding unit comprises a lens clamp, a supporting shaft, a support and a clamping mechanism capable of clamping a galvanometer lens; the two ends of the lens clamp are an assembling hole and a through groove respectively, the two ends of the supporting shaft are a connecting end connected with the support and a matching end detachably inserted into the assembling hole respectively, a driving shaft of the galvanometer motor can be inserted into the assembling hole, the through groove can contain a galvanometer piece and an adhesive, and the laser emitting unit comprises a laser emitter capable of emitting light beams to the reflecting surface. The reflecting surface can reflect the light beam to the optical screen, when the reflecting surface reflects the light beam to the preset qualified area, the parallelism between the reflecting surface and the inner wall of the through groove reaches the preset parallelism, and the galvanometer sheet bonding calibration device achieves calibration of the parallelism between the reflecting surface and the inner wall of the through groove.

A method and system for generating deep ultraviolet (DUV) laser light is disclosed, in one embodiment the DUV laser system includes a fiber laser source configured to emit a poised fundamental laser beam in the near-infrared with a pulse duration of less than 400 femtoseconds (fs), a nonlinear crystal assembly comprising first, second, and third nonlinear crystals that is configured to convert the fundamental laser beam to produce a fifth harmonic laser beam having a wavelength in a range from 200 nanometers (nm) to 230 nm, and at least one compensation plate disposed in at least one position preceding at least one of the first, second, and third nonlinear crystals and configured such that a pair of pulsed laser beams transmitted through the at least one compensation plate are spatially and temporally overlapped within the at least one of the first, second, and third nonlinear crystals.

The application provides an integrated forming machine, and relates to the technical field of button cell manufacturing technology.The integrated forming machine comprises a forming machine body, a positioning assembly is arranged below a laser cutting system, the laser cutting system comprises a laser moving module, a fiber laser head and an ultraviolet laser head are arranged on the laser moving module; and the laser cutting system is used for cutting materials of a jig assembly and forming products. The cutting and jacking assembly of the integrated forming machine can move the jig assembly at the first full-dish stacking assembly to the positioning assembly, and cut the materials in the jig assembly by using the laser cutting system; then the cutting and jacking assembly moves the jig assembly after laser cutting to the discharging assembly, and after the products after cutting in the jig assembly are removed from the discharging assembly, the cutting and jacking assembly moves the jig assembly to the first empty-dish stacking assembly, so that the materials are automatically cut by using the laser cutting system.

The present invention discloses a tunable pump terahertz broadband near-field imaging and spectroscopy device and its usage method, which relates to the field of terahertz near-field microscopes. The device includes: a first fiber laser oscillator, a second fiber laser oscillator, an optical fiber beam splitter, a first delay line, a second delay line, a third delay line, a fourth delay line, a transmitting antenna, a first parabolic mirror, a second parabolic mirror, an atomic force microscope, a receiving antenna, a processor, a synchronous phase-locked loop, a first energy adjustment module, a second energy adjustment module, a first reflector and a second reflector; the present invention realizes the advantages of high pump light energy and tunable pump wavelength in a terahertz near-field microscope.

1. Name of the Design Product: Fiber Laser Pipe Cutting Machine. 2. Use of the Design Product: For pipe cutting. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photograph that Best Illustrates the Design Key Points: Perspective View 1.

The invention provides a multi-longitudinal-mode fiber laser weak current detection method based on a magnetic rotation sensitive material, and the method comprises the following steps: building a multi-longitudinal-mode fiber laser weak current detection system; a relationship between the magnetic field intensity and the current in the DC coil; determining the relationship between the intra-cavity loss and the Faraday rotation angle of the multi-longitudinal-mode fiber laser resonant cavity within the magnetic field range which does not reach the magnetic saturation intensity of the magneto-optical material; calculating a current value when the magnetic field reaches the magnetic saturation intensity value of the magneto-optical material; when the to-be-measured current value on the coil is between 0 and the critical current, calculating the to-be-measured current value; the magneto-optical sensor is arranged in the multi-longitudinal-mode fiber laser resonant cavity, and the corresponding relation between light intensity change and weak current is constructed through the matching relation between the magneto-optical sensor and the multi-longitudinal-mode fiber laser resonant cavity, so that small current change which is difficult to measure by a traditional sensor can be detected, and high-sensitivity measurement is realized.

1. Name of the product in this design: Marking Machine (Fiber Laser Automatic). 2. Purpose of this design: To mark characters or other markings on the outer surface of optical fibers using laser technology. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The invention provides a magnetic interface open type fluid chip and a preparation method thereof, and belongs to the technical field of microfluidics and millifluidics. The method comprises the following steps: performing standardization treatment on ferroferric oxide powder to obtain magnetic hydrophobic particles; then wrapping the target liquid with the particles through controllable shaking to form a smooth liquid cake with a magnetic response core-shell structure; dehydrating the smooth liquid cake through programmed stepped heating evaporation treatment to form a wrinkled liquid cake; and finally, cutting and shaping the wrinkled liquid cake by using laser to obtain the magnetic interface open type fluid chip. The magnetic particles form a stable wrapping layer on a liquid-gas interface, so that the chip structure can stably exist in the air without being supported by an oil phase; meanwhile, the optical fiber laser is used for accurately cutting the liquid cake, the channel configuration can be flexibly reconstructed on site according to requirements, and the problems that in the prior art, the environment dependence is high, and the configuration is solidified are effectively solved.

1. The name of the design product: open type coil fiber laser cutting machine. 2. The use of the design product: cutting of stainless steel coil, galvanized coil, cold-rolled coil, hot-rolled coil and other metal sheet materials. 3. The design points of the design product: the shape of design 1, the shape, color and their combination of design 2. 4. The picture or photo that best shows the design points: the perspective view of design 2. 5. The bottom surface of the design product is the part that is not easy to see or cannot be seen during use, so the top view of design 1 and the top view of design 2 are omitted. 6. Design 1 is designated as the basic design. 7. Other circumstances that need to be explained: design 2 of the design requires protection of color.

The invention discloses a Ta-10W alloy hybrid welding method for optical fiber laser focus rotation along with welding laser shock, and belongs to the technical field of welding. In the Ta-10W laser welding process, the laser focus rotation and laser shock composite technology is adopted, and the comprehensive beneficial effects of pore inhibition and penetration depth increase are achieved through the synergistic effect of the laser focus rotation and laser shock composite technology. According to the specific design, a focus rotating fiber laser and nanosecond high-energy pulse laser paraxial composite method is adopted, the distance between an impact laser spot and a welding spot is adjusted, the vibration regulation and control effect of impact waves generated by pulse laser on a keyhole and a molten pool is utilized, collapse of the rear wall of the keyhole is restrained, bubble escape is promoted, the pore size is reduced, and the porosity is reduced; and the influence effect of laser focus spin welding on welding seam depth reduction is reduced.

The invention discloses an automatic quick-changing device of an optical fiber laser head, and belongs to the technical field of laser welding, the automatic quick-changing device of the optical fiber laser head is installed on welding equipment, the welding equipment comprises an executing mechanism, a laser head support and at least two laser heads, and the executing mechanism is provided with a fixed end and a movable end; the laser head bracket is arranged beside the fixed end of the executing mechanism; the at least two laser heads are arranged on the laser head bracket; the automatic quick-change device of the optical fiber laser head comprises a male joint, a female joint and a connecting mechanism, wherein the male joint is fixed at the moving end of an executing mechanism; the female connectors are fixed on the laser head in a one-to-one correspondence manner; and the connecting mechanism is arranged on the male joint. According to the automatic quick-changing device for the optical fiber laser head, switching of the laser head can be automatically completed, the switching efficiency is high, the safety risk in the manual installation process is reduced, meanwhile, the automatic quick-changing device can be suitable for occasions where manual operation cannot be conducted directly, such as inert gas environment welding or vacuum environment welding, and the application range is wider.