1154 results about "Laser technology" patented technology

The invention provides a wind turbine generator array wake flow management method and system for Doppler laser wind measurement, and relates to the technical field of laser, and the method comprises the steps: collecting the real-time wind speed data, wind direction data and turbulence intensity data of each generator in the front and back direction through deploying a Doppler laser radar in a wind turbine generator array; establishing a wake flow influence model containing a wake flow influence coefficient, an attenuation coefficient and a diffusion coefficient based on the data, and calculating to obtain a wake flow influence range, loss power and a recovery distance; according to the method, the wind turbine generator array is cooperatively controlled, and the power generation efficiency of the wind turbine generator array is optimized by adjusting the yaw angle or the pitch angle of the upstream unit and the rotating speed of each unit. The wind speed data acquisition precision of the wind field is improved, the wake flow influence evaluation accuracy is enhanced, and the overall power generation efficiency of the wind field is remarkably improved.

The invention relates to the technical field of laser SLAM, and particularly discloses a laser SLAM method based on ground segmentation, and the method comprises the steps: obtaining laser radar point cloud data information, carrying out the point cloud preprocessing of the laser radar point cloud data, and obtaining ground point cloud features and non-ground point cloud features; respectively carrying out feature extraction, feature matching and pose estimation on the ground point cloud features and the non-ground point cloud features to obtain a pose nonlinear optimization constraint result; selecting a key frame according to a pose nonlinear optimization constraint result, constructing a local map according to pose information of the key frame, and obtaining a local map construction result; loopback detection is carried out according to the local map construction result, and a loopback detection constraint result is obtained; and performing global pose optimization processing according to a loopback detection constraint result and a local map construction result to obtain a global pose and global map construction result. The laser SLAM method based on ground segmentation provided by the invention can improve the positioning precision and the operation stability.

The invention relates to the technical field of laser, in particular to a dual-wavelength narrow-linewidth laser output device and method.The dual-wavelength narrow-linewidth laser output device comprises a semiconductor laser unit emitting linearly polarized light beams, and a light beam conversion lens is used for achieving conversion of semiconductor laser fast-axis light beams and semiconductor laser slow-axis light beams; the light beam conversion lens is used for collimating and compressing a semiconductor laser fast axis divergence angle, and the slow axis collimating lens is used for collimating and compressing a semiconductor laser slow axis divergence angle; the linearly polarized light beam is divided into a first light beam and a second light beam through the rectangular prism; the first light beam sequentially passes through a first volume Bragg grating, a first reflector, a half-wave plate and a polarization beam combiner; the second light beam sequentially passes through a second volume Bragg grating, a second reflector and a polarization beam combiner; the dual-wavelength narrow-linewidth semiconductor laser can solve the problems of precise regulation and control and power amplification of the central wavelength of the dual-wavelength narrow-linewidth semiconductor laser, has power expansibility, and realizes improvement of laser power by stacking a plurality of laser units in the vertical direction.

The invention provides a quasi-continuous thulium-doped fiber laser capable of synchronously suppressing relaxation oscillation and self-pulse, relates to the technical field of fiber laser, and is used for simultaneously realizing suppression of a self-pulse effect and a relaxation oscillation peak. Comprising a continuous driving module, a pulse driving module, a semiconductor laser pumping source, a high-reflectivity fiber bragg grating, a low-reflectivity fiber bragg grating, a beam combiner, a thulium-doped gain fiber, a passive fiber, a cladding pumping stripper and a laser output port, the continuous pump light and the pulse pump light are respectively driven by the continuous driving module and the pulse driving module to output continuous pump light and pulse pump light; the high-reflectivity fiber bragg grating and the low-reflectivity fiber bragg grating form a resonant cavity structure, the thulium-doped gain fiber serves as a gain medium of the thulium-doped fiber laser and absorbs pump light to generate population inversion, laser oscillation is formed by combining the resonant cavity of the laser, relaxation oscillation suppression is achieved, and meanwhile longitudinal mode distribution of the laser is effectively disrupted.

The invention belongs to the technical field of laser, and discloses a grating multiplexing spectrum synthesis system, which comprises a beamlet dense array, a diffraction grating and a turn-back mirror, each beamlet emitted by the beamlet dense array is diffracted by the diffraction grating and then is emitted in the form of convergent light, and the light is reflected twice by the turn-back mirror to form a light beam; each laser sub-beam is incident on the diffraction grating again along the opposite direction parallel to the original light, the sub-beams converge into one point on the diffraction grating by adjusting the distance between the turn-back mirror and the diffraction grating, and at the moment, the incident angle of each sub-beam is equal to the diffraction angle diffracted from the diffraction grating for the first time; and the diffraction angles of the sub-beams subjected to the second diffraction on the diffraction grating are equal and equal to the incident angle of the sub-beams subjected to the first diffraction, that is, the synthesized light beam is emitted along the direction parallel to and opposite to the direction of the light beam emitted from the sub-beam dense array. The invention provides a spectrum synthesis system which is simple in structure, easy in engineering implementation and compact in volume.

The invention provides an ultrasonic probe normal automatic attitude adjustment method and system based on laser ranging for a curved surface component, and relates to the technical field of laser, and the method comprises the steps: scanning the curved surface component through a laser ranging sensor array, obtaining surface space coordinate point data, fitting a curved surface geometric equation, and dividing a detection area. And selecting a detection center point in each detection area, calculating a normal vector of the curved surface, converting the normal vector to a local coordinate system of the probe, constructing a pose transformation matrix, and calculating an attitude angle parameter of the ultrasonic probe. And finally, converting the attitude angle parameter into a motion control instruction of a robot end effector, driving a three-axis servo motor assembly to adjust the attitude of the ultrasonic probe, and performing real-time attitude correction through an angle encoder to ensure that the ultrasonic probe is always perpendicular to the surface of the curved surface component. According to the invention, normal automatic posture adjustment of the ultrasonic probe in curved surface component detection is realized, and the detection precision and efficiency are improved.

The invention discloses a walk-off compensation device for laser frequency tripling, and relates to the technical field of laser, and the device comprises a fundamental frequency light source which is used for generating fundamental frequency laser; the frequency doubling unit is used for converting the fundamental frequency laser into frequency doubling laser; the frequency tripling unit comprises a frequency tripling nonlinear crystal and is used for converting the frequency-doubled laser and the residual fundamental frequency laser into frequency tripled laser; the walk-off pre-compensation unit is arranged between the frequency doubling unit and the frequency tripling unit, the walk-off pre-compensation unit comprises a spherical lens which is eccentrically arranged, the spherical lens is used for enabling the frequency doubling laser and the residual fundamental frequency laser which is not completely converted to generate a preset included angle, and the preset included angle is matched with a walk-off angle generated in the frequency tripling nonlinear crystal; and the light beam shaping unit is used for outputting ultraviolet laser. According to the invention, a complex pre-compensation optical element does not need to be added in front of the frequency tripling unit, walk-off compensation can be realized only through the eccentrically placed spherical lens, and the structure of the optical system is greatly simplified.

The invention discloses a compact monolithic dual-wavelength distributed feedback laser device and a manufacturing method thereof, and belongs to the technical field of laser, the laser device is composed of a front part, a middle part and a rear part, and the middle part comprises two equivalent Pi phase shift chirp sampling gratings. The laser is based on a reconstruction equivalent chirp technology and has a tunable wavelength interval. A chirp sampling grating with two equivalent phase shifts is arranged in the laser, and the grating is composed of a front part, a middle part and a rear part. Phase matching is achieved through the microstructure quasi-phase matching technology, it is ensured that a laser resonant cavity reaches the phase matching condition at the phase shift position, and wide-range adjustment expanded from 59.50 GHz to 116.25 GHz can be effectively achieved by changing injection current. The invention has the advantages of accurate wavelength control, simple structure, low power consumption, high integration level and the like.

The invention provides a distributed feedback laser with a double-layer grating structure, and relates to the technical field of lasers, the laser forms an InGaAlAs multi-quantum well active region, an upper sampling grating layer and a lower phase shift grating layer on an n-type InP substrate in sequence, the upper grating layer is designed based on a reconstruction equivalent chirp technology, and the lower phase shift grating layer is designed based on a reconstruction equivalent chirp technology. Two sections of asymmetric modulation areas with sampling periods linearly gradually changing in opposite directions are arranged in the axial direction of the resonant cavity, and the lower grating layer is a quarter-wave phase shift grating matched with the period of the upper seed grating. Through the synergistic effect of equivalent phase modulation and phase shift generated by the double-layer grating, the photon density distribution in the cavity can be improved, the longitudinal space hole burning effect can be weakened, the sensitivity to end face phase fluctuation can be reduced, high single-mode power and large modulation bandwidth can be realized in a wide temperature range, and the double-layer grating is suitable for a high-speed optical communication and coarse wavelength division multiplexing transmission system.

The invention provides a woven bag cutting device based on a laser technology and a control method of the woven bag cutting device. The control method comprises the steps that an active traction motor is controlled to pull woven base cloth placed on a base cloth feeding frame; the position of the woven base cloth is detected through a photoelectric sensor, and accurate positioning of the woven base cloth is ensured in cooperation with an EPC automatic deviation rectifying device; a spiral line type transition roller is controlled to preliminarily flatten the woven base cloth to obtain preliminarily flattened woven base cloth; controlling a flattening negative pressure box to adsorb the preliminarily flattened woven base cloth to obtain flattened optimized woven base cloth; controlling a laser cutting group to perform laser cutting on the flattened and optimized woven base cloth to obtain laser-cut woven base cloth; and controlling a buffer transition roller to convey the woven base cloth subjected to laser cutting.

The utility model discloses a battery insulation ink-jet production line which can effectively isolate aluminum powder particles generated by laser cleaning so as to avoid affecting the printing effect. The battery insulation ink-jet production line is arranged in a multi-section mode and at least comprises a cleaning section branch line, a side face printing section branch line and an end face printing section branch line, and the cleaning section branch line, the side face printing section branch line and the end face printing section branch line are sequentially arranged in the front-back direction. The cleaning section branch line, the side face printing section branch line and the end face printing section branch line are each provided with a machine shell to be isolated from one another, the cleaning section branch line conducts texturing treatment on the surface of a battery cell through a laser technology, and the side face printing section branch line conducts spray printing of insulating paint on the textured side face surface of the battery cell so as to form an insulating protection layer covering the side face of the battery cell. And the end face printing section performs insulating paint jet printing on the end face of the explosion-proof valve and the end face of the pole of the battery cell in a branching manner so as to form an insulating protection layer covering the two end faces.

The invention provides an atmospheric pollutant traceability analysis method and system. According to the method, a form classification standard is established through particle shape features, and atmospheric particles are divided into naturally raised dust and industrial emission particle swarms. A dual-wavelength laser technology is adopted for natural flying dust, specifically, the first wavelength is matched with the inherent frequency of mineral crystals, amorphous scattering interference is blocked through polarization beam splitting, and a reflection signal sequence is extracted to generate a mineral migration path; and the second wavelength screens heavy metal scattering signals of the industrial particles, and a heavy metal diffusion track is constructed by utilizing spatial intensity gradient. And superposing the two paths and aerosol three-dimensional distribution data to generate a thermal distribution diagram, and when the space density exceeds a threshold value, calculating a migration path deviation value and a trajectory offset, dynamically distributing pollution source contribution weights, and outputting a pollution source analysis result. According to the invention, dynamic and accurate analysis of natural and industrial pollution sources is realized, and the regional pollution traceability and management and control strategy targeting are improved.

The invention discloses a high-light element damage monitoring method and system, a storage medium and a computer program product, and relates to the technical field of high-energy laser, and the method comprises the steps: starting a laser device to irradiate a to-be-monitored high-light element, the element temperature, the light spot power and the light spot image of the highlight element to be monitored in the irradiation process are acquired through a data acquisition module; generating a light spot analysis diagram, a temperature space distribution diagram and a temperature power time distribution diagram according to the element temperature, the light spot power and the light spot image; and performing damage monitoring on the highlight element to be monitored based on the light spot analysis diagram, the temperature space distribution diagram and the temperature power time distribution diagram. According to the invention, the state of the strong light element under laser irradiation is comprehensively reflected from different angles by simultaneously collecting multiple parameters, and misjudgment or missed judgment possibly caused by single parameter monitoring is avoided, so that the comprehensiveness and accuracy of monitoring are improved.

The invention relates to the technical field of laser, and provides a laser system with a controllable pulse state and a control method thereof. The control method of the laser system with the controllable pulse state comprises the steps that under the conditions that the cavity length of an FP cavity is in an initial fit state and the air pressure in the FP cavity is standard air pressure, a pump light source is controlled to adjust the pump power according to a first set; in response to the fact that the target pulse interval is smaller than the initial pulse interval, the pump light source is controlled to keep the target power unchanged, the air pressure of the FP cavity is adjusted to be within the preset range, and the cavity length of the FP cavity is adjusted through a second set; determining a target cavity length; controlling the laser to be output in a first pulse state; and controlling the laser to output in a second pulse state. According to the control method, the controllably generated abnormal wave form with the high peak power is introduced according to the preset frame structure to serve as a physical layer disturbance or random segment, and the reliability and safety of system signal transmission are improved under the condition that data segment transmission is not affected.

The invention provides a dual-wavelength tunable all-solid-state mid-far infrared laser, relates to the technical field of lasers, and is used for solving the technical problems that high-performance dual-wavelength 3 [mu] m waveband laser and mid-far infrared waveband laser generated by pumping of the high-performance dual-wavelength 3 [mu] m waveband laser are difficult to obtain in the prior art. The middle and far infrared laser comprises an erbium-doped laser and an optical parametric oscillator, the erbium-doped laser is used for providing dual-wavelength 3-micron wave band pulse laser, and the erbium-doped laser comprises a pumping source, an erbium-doped laser medium, a gain modulator, a high reflective mirror and an output mirror; the optical parametric oscillator is used for obtaining medium-wave infrared laser and long-wave infrared laser which are output in a dual-wavelength mode under the pumping effect of the dual-wavelength pulse laser in the 3-micron wave band. The mid-far infrared laser is simple in structure and convenient to use, can obtain tunable dual-wavelength mid-far infrared pulse laser with high beam quality, and meets the light source requirements of differential absorption of toxic gas telemetering of laser radar and photoelectric countermeasure.

The invention relates to the field of agricultural irrigation, in particular to an intelligent water distribution system and method for root space-time competition of an intercropping system, and is applied to agricultural precise irrigation, efficient utilization of water resources and management of the intercropping system. According to the system, the ground penetrating radar and the multispectral laser technology are fused, and crop root system distribution, activity and nutrient data are accurately obtained. Based on transfer learning and multi-agent reinforcement learning algorithms, a root system competition model is constructed, and an optimal water distribution strategy is intelligently decided. The deformable drip irrigation execution module achieves precise irrigation, the water consumption is greatly reduced by 20%-35%, and waste is effectively avoided. Meanwhile, the system balances the growth requirements of intercropping crops, relieves root competition, improves the overall yield and stability, and the amplification reaches 15%-25%. According to the system, the utilization efficiency of water resources is remarkably improved, and powerful support is provided for sustainable development of modern agriculture.

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 relates to the field of PCB (printed circuit board) printing, in particular to a high-precision multi-layer lamination and alignment PCB printing process which comprises a substrate pretreatment stage, a substrate preassembly stage, a dynamic lamination stage and a finished product output stage, the dynamic lamination stage comprises preheating treatment and resonance impurity removal treatment, and the lamination stage is divided into multi-stage lamination. And air bubbles and resin between the laminated bodies are optimized in the second pressing stage. According to the method, the inner-layer core plate and the copper foil are pretreated, so that positioning of the multi-layer core plate is more accurate and detection is facilitated, meanwhile, nanoscale micropores are formed in the copper foil through a laser technology to improve the flowing property of subsequent resin, and in the pressing process, pre-pressing and multi-stage pressing are set to improve the pressing accuracy; and in the second-stage pressing process, the dispersion direction of internal bubbles and the flowing direction of resin are improved through an ultrasonic device, a radiation heating device, a magnetic field assisting device and the like, the alignment accuracy and the pressing precision of the plate are further improved, and the machining efficiency is guaranteed.

The invention discloses water-jet-guided laser cutting equipment and a water-jet-guided laser cutting system, and relates to the technical field of water-jet-guided lasers. The device comprises a dual-wavelength laser assembly, a reflection assembly, a liquid supply assembly and a coupling assembly. The dual-wavelength laser assembly can generate visible laser and invisible laser and coaxially output the visible laser and the invisible laser to the reflection assembly. The reflection assembly is used for refracting the visible laser and the invisible laser to the coupling assembly. The liquid supply assembly is used for supplying guiding liquid to the coupling assembly. The coupling assembly is provided with a nozzle and a coupling body which are connected with each other and used for coupling the guiding liquid, the visible laser and the invisible laser and outputting the laser through the nozzle. Visibly, the visible laser and the invisible laser with the power far greater than that of the visible laser are simultaneously utilized in the water-guided laser, so that the laser power is improved while the visibility of the liquid jet is ensured, the processing efficiency is further improved, and the cost is reduced.

The invention discloses a welding seam quality detection system and method based on a laser technology, and the system comprises a laser collection module which is used for emitting a laser beam to a to-be-detected target welding seam, and collecting a beam signal reflected by the target welding seam; the light path transmission module is used for receiving and transmitting the light beam signal; wherein the light path transmission module comprises a light path adjusting unit and a photoelectric receiving unit, the light path adjusting unit is used for adjusting the propagation path of the light beam signal so that the light beam signal can be propagated to the photoelectric receiving unit, and the photoelectric receiving unit is used for converting the light beam signal into an electric signal; and the signal processing module is used for receiving the electric signal and detecting the quality of the welding seam according to the electric signal. Welding seam detection is achieved through the laser technology, and the welding seam quality detection effect can be improved.

The invention relates to the technical field of femtosecond laser, and discloses a multifunctional ophthalmology femtosecond device and a use method, and the device comprises a scanning imaging module which is used for emitting a detection light beam and carrying out OCT imaging; the femtosecond laser scanning module is used for receiving the detection light beam and irradiating the detection light beam to the target tissue; the femtosecond laser scanning module is also used for generating femtosecond laser and focusing the femtosecond laser to the target tissue; the operating microscope module is used for receiving the detection light beam and irradiating the detection light beam to a target tissue; the operating microscope module is also used for carrying out microscope imaging. According to the method, the optical coherence tomography technology is fused, more imaging information is added on the basis of an original visible light image, the re-alignment precision can be effectively improved, and the problem that a separation hook enters a wrong corneal lens layer is avoided.

The utility model provides an underwater three-dimensional reconstruction image acquisition device with binocular camera fused with line laser, comprising a binocular cabin and an aviation plug, the binocular cabin is internally provided with a camera and a laser emitter, and the aviation plug is used for realizing electrical connection between an external power supply and rear-end imaging processing equipment and between the camera and the laser emitter; the two camera cabin bodies are arranged on the two sides of the middle cabin body, the laser transmitter is arranged in the middle cabin body, and the cameras are arranged in the camera cabin bodies, so that a binocular camera and a line laser technology are integrated on one set of equipment, the binocular camera is fused with line laser to realize an underwater image shooting function, and high-precision and high-stability underwater three-dimensional reconstruction is realized; therefore, the requirements of the fields of ocean engineering, ocean science and the like for underwater three-dimensional data acquisition are met, and the problem that the effect and the application range of underwater three-dimensional reconstruction are limited due to the fact that existing underwater camera equipment cannot achieve the functions of a binocular camera and a line laser at the same time is solved.

The invention relates to the technical field of all-solid-state laser, and provides a thermal stress self-matching laser device and a regulation and control method thereof. The resonant cavity oscillates the pumping laser, and an input lens and an output lens are oppositely arranged in the resonant cavity; the gain medium is arranged between the input lens and the output lens; the stress self-adaptive heat sink is used for dissipating heat and can monitor and adjust a real-time stress value borne by the gain medium; the power meter is arranged at the downstream of the output lens along the light path and is used for measuring the power of the output laser; a stress threshold value is preset in the processor; and the processor is used for controlling the stress adaptive heat sink to adjust the real-time stress value based on the power and the stress threshold value, so that the power meets a preset requirement. According to the invention, the stress of the gain medium in the operation process of the laser is monitored, regulated and controlled, and the stress matching of the gain medium is realized, so that the thermally induced stress damage risk of the gain medium is reduced.

The utility model relates to the technical field of lasers, and discloses a high-slope-efficiency surface grating surface emitting laser which comprises a substrate, a lower waveguide layer, an active layer and an upper waveguide layer from bottom to top along the cross section. A ridge-shaped waveguide is formed in the middle area of the uppermost layer of the upper waveguide layer, and a Bragg grating is etched on the surface of the ridge-shaped waveguide; the Bragg grating comprises a section of second-order grating located in the middle and two sections of first-order gratings located at the two ends; a lambda / 4 phase shift is arranged in the second-order grating; the lambda / 4 phase shift is located in an etching area or a non-etching area of the first-order grating closest to the second-order grating; when the lambda / 4 phase shift is located in the etching region of the first-order grating closest to the second-order grating, the upward diffraction light power of the second-order grating is maximum, and the downward diffraction light power is minimum; when the lambda / 4 phase shift is located in the non-etching area of the first-order grating closest to the second-order grating, the upward diffraction light power of the second-order grating is minimum, and the downward diffraction light power of the second-order grating is maximum. According to the invention, high-slope efficiency lasing can be realized.

The invention belongs to the technical field of laser, and discloses a laser beam splitting and combining device based on an acousto-optic deflector pair and application thereof, and the laser beam splitting and combining device comprises a transmitting optical fiber module, a first acousto-optic deflector, a diaphragm, a second acousto-optic deflector and a receiving optical fiber module which are sequentially arranged; the first acousto-optic deflector and the second acousto-optic deflector are arranged in parallel; the transmitting optical fiber module is used for transmitting laser to the first acousto-optic deflector; the first acousto-optic deflector and the second acousto-optic deflector are used for deflecting, splitting or combining laser beams; the diaphragm is used for blocking secondary diffracted light except the primary diffracted light; and the receiving optical fiber module is used for receiving the laser emitted from the second acousto-optic deflector. Therefore, the technical problems that in the prior art, the laser beam splitting function and the laser beam combining function are mutually independent, two kinds of operation cannot be considered in the same device, and real-time regulation and control over the light beam operation mode are lacked are solved.

The invention discloses a device for cutting daily glass through laser. The device comprises a laser assembly, a clamping jaw assembly and a product supporting assembly. The product supporting assembly is used for supporting daily glass, the clamping jaw assembly is located over the product supporting assembly and clamps the daily glass on the product supporting assembly, the laser assembly is located on one side of the clamping jaw assembly, the laser assembly points to the daily glass, and the daily glass is cut through laser. According to the invention, on the aspect of technical principle, an advanced laser technology and a high-precision control system are fused, the limitation of a traditional cracking method is broken through, and fine processing of the cracking of the glassware is realized by accurately regulating and controlling laser energy and pulse parameters.

The invention discloses a solid laser light-gathering cavity and a solid laser, and relates to the technical field of laser, the solid laser light-gathering cavity and the solid laser are provided with a light-gathering cavity main body, a heat conduction sleeve and a water cooling sleeve, and light source heat in the light-gathering cavity main body is transmitted to the water cooling sleeve through the heat conduction sleeve; water in the water-cooled jacket can cool heat and radiate and refract the light source at the same time, when the light source irradiates the condensation reflection coating and the metal reflection film in the water-cooled jacket, the light source is transmitted to the crystal rod again through the water and the heat conduction jacket, and when the light source reaches the heat conduction graphite film in the water-cooled jacket through the condensation reflection coating and the metal reflection film, the heat conduction graphite film is cooled. The heat-conducting graphite film can transmit heat to the water-cooled jacket, and meanwhile, the heat can be transmitted out through the radiating fins, so that the heat can be quickly and effectively dissipated, and the surface of the solid laser is prevented from being hot.

The invention discloses a device for dynamically regulating and controlling a laser polarization state based on an acousto-optic device, and belongs to the technical field of laser, and the device comprises a laser beam splitting unit which is used for carrying out beam splitting on incident laser according to the polarization state and the polarization angle of target laser to be generated and generating two beams of linearly polarized laser with adjustable propagation directions and light beam intensity; the acousto-optic phase control unit is used for performing acousto-optic modulation on the linear polarization laser of the second light path to change the phase of the linear polarization laser and compensating the frequency deviation of the linear polarization laser of the second light path so as to control the phase difference between the linear polarization laser of the second light path and the linear polarization laser of the first light path; and the light beam direction adjusting assembly is used for controlling the two beams of linearly polarized laser to enter the polarization beam combining unit at the same time so as to obtain target laser. The laser polarization state control device is simple in structure and low in cost, various pulse strings with specific polarization modes can be generated, and therefore the technical problems that a laser polarization state control device is complex in structure, high in cost, poor in control flexibility and low in regulation and control frequency are solved.

The invention discloses an air-cooled tunable single-frequency pulse slab laser, and belongs to the technical field of solid laser. According to the method, a diode stack array, a pumping shaping system, a coupling cavity mirror, a slab laser crystal, a first reflecting mirror and a thin film polaroid are included, and the diode stack array serves as a pumping source; the pumping shaping system is used for eliminating the non-uniformity in the slow axis direction of the diode stack array and directly pumping the slab laser crystal based on the end face of the coupling cavity mirror; the coupling cavity mirror, the first reflecting mirror and the thin film polaroid jointly form an annular resonant cavity, oscillation laser passes through the lath laser crystal back and forth in the annular resonant cavity for multiple times, and finally single-frequency pulse laser is output through the thin film polaroid. Continuous seed modulation or seed injection locking is not needed, the system is simple and reliable, the cost is low, and the large-energy single-frequency pulse laser light source can be used for atmospheric exploration.

The invention relates to the technical field of laser, in particular to a follow-up atmosphere protection large slewing bearing laser cladding repairing device and method.The device comprises a large slewing bearing, a laser cladding system, an X-Z-axis two-dimensional motion platform, a follow-up inert atmosphere chamber, a C-axis rotating table, an atmosphere control system and a master control system. According to the invention, the cladding head is driven to generate relative motion in the vertical direction and the horizontal direction by virtue of the X-Z-axis two-dimensional motion platform, and the inert atmosphere chamber and the cladding head are driven to move in the circumferential direction of the slewing bearing subjected to additive machining by virtue of the C-axis rotating table, so that continuous machining of laser cladding additive manufacturing and remanufacturing of the large rotary structural member is realized. The follow-up inert atmosphere chamber is small in volume, short in inflation and deflation time and high in efficiency. And the cladding head is provided with double hammering units, so that hot metal which is just deposited can be hammered synchronously, and cladding processing and processing post-processing can be carried out synchronously.