36 results about "Greenlight laser" patented technology

The invention relates to a system and a method for detecting thermal stress of an aero-engine blade. The system comprises a green laser, a near-infrared laser, and an optical splitter, a scanning control unit, a signal receiver and a processing module which are connected in sequence, the green laser and the near-infrared laser are respectively connected with the optical splitter; the green laser is used for outputting a first laser beam to the engine blade; the near-infrared laser is used for outputting a second laser beam to the engine blade; the optical splitter is used for combining the first laser beam and the second laser beam to obtain a combined beam; the scanning control unit is used for controlling the combined light beam to scan engine blades; the signal receiver is used for receiving an ultrasonic signal and a photoacoustic signal generated by the engine blade based on the combined light beam; and the processing module is used for processing the ultrasonic signal and the photoacoustic signal to generate a detection result. According to the invention, an accurate and efficient three-dimensional visual solution can be provided for the detection of the thermal stress of the aero-engine blade.

The invention belongs to the field of high-thermal-conductivity composite materials, and particularly relates to a 3D printing copper-diamond composite high-thermal-conductivity material and a preparation method thereof.The 3D printing copper-diamond composite high-thermal-conductivity material comprises a copper matrix and diamond particles dispersed in the copper matrix, and the surfaces of the diamond particles are provided with metal coatings; the copper matrix is formed by copper powder with the particle size of 10-100 microns, and the volume fraction of the diamond particles in the composite material is 40%-50%; according to the method, the titanium plating layer is prepared on the surface of the diamond, the stable titanium carbide transition layer is formed through the reaction of titanium and carbon, the interface thermal resistance between the diamond and copper is remarkably reduced, the interface bonding strength is improved, and heat conduction is facilitated. The selected area green laser 3D printing technology is adopted, a green laser device shows remarkable advantages in the field of 3D printing of copper alloy, and the heat conductivity of the prepared composite material can reach and is remarkably higher than that of pure copper by optimizing the diamond volume fraction and 3D printing process parameters.

The utility model relates to a laser beam combining device and a projector, the laser beam combining device comprises a first laser assembly, a second laser assembly and a beam combining structure, and the first laser assembly comprises a first green laser and a first blue laser; the second laser assembly comprises a second green laser and a second blue laser; the beam combining structure is used for combining light output by the first laser assembly and light output by the second laser assembly, the beam combining structure comprises a partition diaphragm, the partition diaphragm comprises a first area and a second area which are connected, and blue light output by the first blue light laser device and green light output by the second green light laser device are combined through the first area and then output through the second area; and green light output by the first green light laser and blue light output by the second blue light laser are combined through the second area. According to the invention, by arranging the partition diaphragm, the blue light and the green light of the first laser assembly and the second laser assembly are combined on the same partition diaphragm, so that the optical expansion amount of the combined light is greatly reduced.

The application provides a high-power optical fiber green laser, and belongs to the technical field of optical fiber lasers; specifically comprises a seed source module, which is used for providing a seed light source with adjustable pulse width and frequency, and performing phase modulation on the seed light source to broaden the spectrum; a first amplification unit is connected with an output end optical path of the seed source module and is used for performing power amplification on the seed light; a second amplification unit is connected with an output end optical path of the first amplification unit and is used for performing power amplification on the signal light again; a third amplification unit is connected with an output end optical path of the second amplification unit and is used for performing third power amplification on the laser; a frequency doubling output unit is connected with an output end optical path of the third amplification unit and is used for performing frequency doubling on the laser amplified for the third time, so as to output green laser with a specified divergence angle and spot size. The application improves the SBS threshold from two aspects of phase modulation and shortening the length of the optical fiber, so that the peak power of the optical fiber green laser is higher.

The invention provides a dual-wavelength beam laser composite additive manufacturing device which comprises a powder feeding nozzle, a red light laser, a green light laser and a scanning galvanometer. A red laser beam emitted by the red laser is output by the laser output channel and is focused on the processing surface to form a red light spot; a green laser beam emitted by the green laser is controlled by the scanning galvanometer to enter the red laser beam in a circular swinging mode and is focused on the machining face to form a green light spot, and the formed green light spot is located on the inner side of the red light spot. The invention provides a dual-wavelength beam laser composite additive manufacturing method. A scanning galvanometer is adopted to control a green laser beam to periodically swing in a red light spot coverage area according to a set circular path. According to the method, the dynamics and microstructure of the molten pool are optimized, the thermal gradient and the cooling rate are adjusted, and ideal conditions are provided for high-density manufacturing of materials such as nickel-based high-temperature alloy, aluminum alloy and copper alloy.

The present invention discloses a semiconductor laser comprising: a substrate, a lower confinement layer, a lower waveguide layer, an active layer, an upper waveguide layer, and an upper confinement layer, arranged in order from bottom to top; the active layer comprising a well layer and a barrier layer; the electron effective mass of the well layer of the active layer being smaller than the electron effective mass of the barrier layer, the spontaneous polarization coefficient of the well layer of the active layer being smaller than the spontaneous polarization coefficient of the barrier layer, and the bandgap width of the well layer of the active layer being smaller than the bandgap width of the barrier layer. The present invention can suppress InN phase separation, segregation, and composition fluctuation in high-In content semiconductor lasers, effectively improve the crystal quality and interface quality of the active layer, effectively enhance the electron-hole recombination efficiency of the active layer, and effectively reduce defects and non-radiative recombination centers, thereby effectively improving the slope efficiency of green lasers.

The utility model provides a novel green laser, which comprises a shell body, a plurality of groups of heat sinks are arranged in the shell body, each group of heat sinks comprises a plurality of heat sinks, a heat dissipation gap is arranged between every two adjacent heat sinks, each heat sink is connected with a laser chip, the heat sinks are arranged in the X-axis direction of the shell body, and the heat sinks are arranged in the X-axis direction of the shell body. The laser chip and the first optical lens group are correspondingly arranged; the packaging size is reduced, the heat dissipation performance is improved, installation and production are more convenient, and meanwhile the production cost is reduced.

The application discloses a laser, a laser light source and a laser projection device, and belongs to the projection display field.The laser comprises a substrate and a plurality of laser units arranged in an array on the substrate.In the application, the laser comprises two rows of laser units, one row of red light laser units for emitting red laser, and the other row of green light laser units for emitting green laser and blue light laser units for emitting blue laser.Under the premise of ensuring the brightness of the laser beam emitted by the laser, the number of laser units in the laser is reduced.Thus, the overall volume of the laser can be effectively reduced, and the volume of the laser projection device integrated with the laser is small.

The application discloses a perovskite laser scribing device, which comprises a base (1), wherein the base (1) is provided with a Y-axis driving part (2) and a mounting rack (3), and the moving end of the Y-axis driving part (2) is provided with a workbench (4); the mounting rack (3) is provided with an X-axis driving part (5), the moving end of the X-axis driving part (5) is provided with a Z-axis driving part (6), and the moving end of the Z-axis driving part (6) is provided with an infrared laser scribing module (7) and a green laser scribing module (8); the infrared laser scribing module (7) is used for emitting infrared laser to perform scribing processing on a workpiece on the workbench (4); the infrared laser scribing module and the green laser scribing module are used for double-light-path processing, the processing efficiency is improved, and meanwhile, the optical path positioning mechanism is used to drive a collection camera to move, so that the collection camera is accurately corresponded with a scribing point, and the processing accuracy is ensured.

The application provides a kind of annular spot laser processing system, including laser light source, first lens, laser crystal, first dichroic mirror, second lens, second dichroic mirror, third dichroic mirror, third lens, fourth dichroic mirror, galvanometer mechanism, target workpiece, platform.The annular spot laser processing system only needs to generate composite laser by using one laser light source, realizes composite laser processing effect, and in the processing process, the main laser can use 500-550nm green laser, which is located in the central inner ring area.The auxiliary laser can use 1000-1100nm infrared light, which is located in the outer ring area, mainly used for preheating and heat transition of target workpiece working area, used for improving green light processing efficiency.The whole process has little spatter, and the heat influence of non-target processing area is small, which greatly improves the workpiece processing precision and yield, and the light conversion efficiency of laser is high, which greatly improves the energy utilization, and the production cost is also lower.

The invention discloses a warship laser lighting system, and relates to the technical field of laser lighting. The lighting system comprises a laser, a lens, an optical fiber, a parabolic mirror and a ceramic assembly which are arranged in sequence. The laser comprises a blue laser and a green laser; the lens comprises a first lens and a second lens; a light hole is formed in the bottom of the parabolic mirror; the ceramic assembly is arranged in the parabolic mirror and comprises fluorescent ceramic, porous ceramic and transparent ceramic which are arranged in sequence. According to the invention, the blue light laser and the green light laser are excited to the surface of the fluorescent ceramic through the optical fiber, the scattering requirements of white light illumination and green light laser are met by designing the surface roughness and the packaging structure of the fluorescent ceramic, and the integration level of the light source is effectively improved.

The invention relates to a high-power green laser synthesis system based on a rotary frequency doubling crystal and multiple beams of infrared pulse laser, and belongs to the technical field of laser. The system comprises a multi-beam pulse infrared laser device, a frequency doubling crystal module, an annular rotating mechanism, a beam combining device, a continuous infrared laser device, a laser frequency regulation and control device and a rotating driving control system. The four beams of pulse infrared laser sources are symmetrically arranged along the circumferential edge, and periodically staggered output is realized through frequency regulation and control; the multiple frequency doubling crystals are distributed along the rotating circular ring at equal intervals and are sequentially aligned with laser pulses under driving of the rotating mechanism, and efficient frequency doubling is achieved. The center continuous infrared laser generates stable green light through frequency doubling of the fixed crystal. Finally, the green light generated by the multiple frequency doubling crystals and the central green light are integrated into a single light beam through a beam combining device to be output. According to the system, the power upper limit and the stability of green laser are remarkably improved through energy sharing of polycrystals, rotary dynamic matching and annular cooling, and the problems that existing green laser is limited in power and serious in heat effect are solved.

The utility model provides an extra-cavity frequency doubling continuous green laser. The extra-cavity frequency doubling continuous green laser comprises a light source used for generating pump light, a resonant cavity assembly, a polarization beam splitter, a frequency doubling element and a reflector assembly. The resonant cavity assembly is used for receiving pump light generated by the light source and converting the pump light into non-polarization-maintaining infrared laser; the polarization beam splitter is used for splitting the non-polarization-maintaining infrared laser into a first path of polarization infrared laser and a second path of polarization infrared laser; the reflector assembly is used for respectively changing the light path directions of the first path of polarized infrared laser and the second path of polarized infrared laser; the frequency doubling element is used for converting at least part of the first path of polarized infrared laser and at least part of the second path of polarized infrared laser into green laser; and the reflector assembly is also used for transmitting the first path of residual polarized infrared laser and the second path of residual polarized infrared laser to the polarization beam splitter and outputting the first path of residual polarized infrared laser and the second path of residual polarized infrared laser through the polarization beam splitter. The extra-cavity frequency doubling continuous green laser provided by the embodiment of the utility model can improve the frequency doubling efficiency, stability and safety of green laser.

This application discloses a welding method for a negative electrode current collector of a lithium battery and a lithium battery. The welding method for the negative electrode current collector of a lithium battery includes: pre-treating the negative electrode tabs of a cylindrical cell to make the negative electrode tabs on the same end of the cylindrical cell adhere to each other; fixing the cylindrical cell and the negative electrode current collector so that the surfaces of the negative electrode tabs of the cylindrical cell and the negative electrode current collector are adhered; the negative electrode current collector is a copper negative electrode current collector with a cleaned surface; and welding the negative electrode tabs and the negative electrode current collector using a green laser according to a preset welding speed, preset welding power, preset welding frequency, and preset welding trajectory. The welding method for the negative electrode current collector of this application can directly weld copper negative electrode current collectors, eliminating the nickel plating process of the negative electrode current collector, thus simplifying the welding process and reducing welding costs.

The invention discloses a high-efficiency all-solid-state quasi-continuous green laser, and belongs to the technical field of lasers. The laser comprises a first dual-wavelength high-reflectivity mirror, a first Q-switch, a first LD side pumping module, a second dual-wavelength high-reflectivity mirror, a quartz rotator, a third dual-wavelength high-reflectivity mirror, a second LD side pumping module, a second Q-switch, a diaphragm, a harmonic output mirror, a frequency doubling crystal and a fourth dual-wavelength high-reflectivity mirror. The first dual-wavelength high-reflectivity mirror, the second dual-wavelength high-reflectivity mirror, the third dual-wavelength high-reflectivity mirror, the harmonic output mirror and the fourth dual-wavelength high-reflectivity mirror form a resonant cavity. An intracavity frequency doubling scheme is adopted, the frequency doubling crystal is placed in a laser resonant cavity for frequency doubling, frequency doubling light is directly output from the resonant cavity, the LBO frequency doubling crystal abuts against the 45-degree harmonic output mirror so that the frequency doubling efficiency can be maximized, and hectowatt-level green light output can be achieved by matching the double LD side pumps and the double Q-switched switches with the 90-degree quartz rotator.

The utility model discloses a green laser, a laser marking machine and a laser cutting machine. The green laser is provided with a first light path formed by a first lens and a second lens, and a second light path formed by the second lens and a fourth lens. The green laser further comprises a third lens, a green frequency doubling assembly, an acousto-optic Q switch and at least one laser crystal, and the third lens is arranged in the second light path, so that the second light path is divided into a first path and a second path; the second lens reflects light in two directions of the first light path and the second light path respectively; the first lens can reflect light of a first light path; the fourth lens can reflect the light of the second path, and the third lens can reflect the light of the first path and the second path; the second lens is used for transmitting first pump light emitted along a first light path and / or along a first path; the third lens is also configured to transmit second pump light emitted along the first path and / or along a second path. The technical scheme of the utility model aims to improve the power of the green laser.

This application provides a green laser, which sequentially includes a pump source, a collimating lens, a focusing lens, a first cavity mirror, a gain medium, a Q-switching element, and a second cavity mirror in a first direction; sequentially includes a third cavity mirror and a displacement motor in a second direction; and sequentially includes a first beam splitter, a frequency doubling crystal, and a fourth cavity mirror in a third direction. The third cavity mirror is located behind the second cavity mirror in the second direction, and the first beam splitter is located behind the first cavity mirror in the third direction. This application achieves adjustable cavity length by moving the third cavity mirror in the second direction through the position of the displacement motor. This allows the green laser to achieve a cavity length suitable for different power outputs by adjusting the cavity length, enabling the same green laser to output multiple power stably and continuously. Therefore, a green laser with precisely adjustable cavity length, compatible with multiple high and low power overlapping stable outputs, high integration, and compact structure is obtained.

The invention discloses a green light material increasing device and method based on high-speed rotating polycrystalline ring throwing pressure forced cooling, the system comprises two core assemblies, namely a high-speed rotating throwing pressure forced cooling mechanism and an inverted cone total reflection mirror, and the high-speed rotating throwing pressure forced cooling mechanism drives a bevel gear transmission system through a servo motor to drive an LBO crystal to rotate at a high speed; meanwhile, a unique memory springback element is adopted to automatically increase the circulation efficiency of cooling liquid and increase the heat exchange area when the temperature rises, and a reset tension spring is matched to ensure the structural stability of the crystal module in the high-speed operation process; according to the device, the stability of the output power of green laser is remarkably improved by optimizing a thermal management mechanism, the device is particularly suitable for additive manufacturing of high-reflection metal materials such as copper and aluminum, the surface quality and the manufacturing efficiency of a formed part can be effectively improved, and an innovative technical solution is provided for laser processing of the high-reflection materials.

The invention relates to a method for processing a blind hole through laser combination, which comprises the following steps: providing a substrate which comprises a copper foil layer, a resin layer and a bottom copper layer which are laminated from top to bottom; a first laser processing device is adopted to perform primary processing on the substrate so as to remove at least part of the copper foil layer and the resin layer of the substrate and form a first blind hole, and the first laser processing device is green laser equipment; and a second laser processing device is adopted to conduct secondary processing on the substrate, the first blind hole serves as the center, the residual copper foil layer and the residual resin layer of the substrate are removed, a second blind hole is formed, and the second laser processing device is carbon dioxide laser equipment. According to the method, the blind hole can be subjected to combined machining based on the green laser equipment and the carbon dioxide laser equipment, so that the damage of the bottom copper layer is controllable.

The invention discloses an aspherical lens with high coupling efficiency for shaping a 510nm-535nm laser light source and a light source coupling module, the aspherical lens sequentially comprises a front surface, a side surface and a rear surface from a light emitting end to a light receiving end, and the aspherical lens is used for shaping a laser light source with the wavelength of 510-535nm, the size of a light emitting surface of 2 mu m * 6 mu m and the light emitting surface of 510-535nm. Laser with the divergence angle Y direction being 22.5 degrees and the divergence angle X direction being 6.3 degrees of emergent light beams is converged into 9.0 mu m * 3 mu m light spots at a light receiving end 4.88 mm away from a light emitting end, the light spots are coupled with a single-mode optical fiber with the vertical aperture NA being 0.15, and conical light beams with the light emitting area being 9 mu m and the light emitting angle being 17 degrees are formed after the light beams are transmitted through the single-mode optical fiber. The light source coupling module comprises the aspheric lens, the optical axis of the aspheric lens, the light-emitting chip of the green laser tube and the fiber core of the single-mode optical fiber are aligned with the packaging line of the module, and one end of the green laser tube, one end of the aspheric lens and one end of the optical fiber are packaged in a packaging shell. According to the high-coupling-efficiency aspherical lens for 510-535 nm laser light source shaping and the light source coupling module, it can be guaranteed that light spots at the output end are circle center light spots, energy distribution is uniform, and brightness is uniform.

The present application discloses a device for SLM forming copper alloy on a ceramic substrate and its working method. The device includes a forming cavity with a forming cylinder at the bottom; a forming device including a first telescopic rod and a forming base plate, the first telescopic rod driving the forming base plate to rise and fall in the forming cylinder, and the forming base plate is provided with a heating mechanism to heat the ceramic substrate; a powder spreading device for spreading copper powder on the ceramic substrate; a laser optical path and scanning device including an infrared laser, a green laser, and a scanning galvanometer, the lasers emitted by the infrared laser and the green laser are both directed to the scanning galvanometer, and the scanning galvanometer projects the laser onto the ceramic substrate. The present application heats the ceramic substrate through the forming base plate to reduce the temperature gradient difference between the ceramic substrate and the copper alloy powder; at the same time, the infrared laser is used to modify the surface of the ceramic substrate so that the first layer of copper alloy and the ceramic substrate form a ceramic-copper alloy composite layer, thereby ensuring the quality of the formed first layer.

The utility model provides a continuous green laser which comprises a hollow shell, and an optical element assembly, a first photoelectric detection assembly, a second photoelectric detection assembly and a main control circuit board are arranged in the shell. The optical element assembly comprises a polarization beam splitting module, a first frequency doubling assembly and a second frequency doubling assembly; the polarization beam splitting module is used for splitting the received target continuous infrared laser into a first path of polarization infrared laser and a second path of polarization infrared laser; the first frequency doubling assembly is used for converting part of the first path of polarized infrared laser into first continuous green laser; the second frequency doubling assembly is used for converting part of the second path of polarized infrared laser into second continuous green laser; the main control circuit board obtains the laser detection power of the first continuous green laser and the laser detection power of the second continuous green laser through the first photoelectric detection assembly and the second photoelectric detection assembly respectively, and adjusts the optical element assembly according to the laser detection power of the first continuous green laser and the laser detection power of the second continuous green laser so as to improve the stability of green laser output.

The application discloses a GaN-based green laser and a preparation method thereof, and relates to the technical field of semiconductor lasers. The preparation method comprises the following steps: sequentially depositing a buffer layer and an n-type AlGaN confinement layer comprising a first sublayer and a second sublayer arranged in sequence on a substrate layer, wherein the Al component of the first sublayer is higher than that of the second sublayer; sequentially depositing an n-type waveguide layer, a quantum well layer, a p-type waveguide layer and an electron blocking layer on the n-type AlGaN confinement layer; and sequentially depositing a p-type AlGaN confinement layer and a contact layer on the electron blocking layer, wherein the p-type AlGaN confinement layer comprises a third sublayer and a fourth sublayer arranged in sequence, and the Al component of the third sublayer is lower than that of the fourth sublayer. According to the application, the refractive index difference between the confinement layer and the waveguide layer is significantly improved, and an asymmetric optical potential well is constructed while the stability of the epitaxial structure is ensured, so that the optical confinement capability is enhanced, the light field leakage is inhibited, and the absorption loss of the p-type region is reduced.

The utility model discloses a desktop type laser marking machine for marking a dental cast two-dimensional code, which comprises a product positioning transplanting module and a Z-axis marking module which are arranged in a shell, and the Z-axis marking module comprises a green laser with a galvanometer and a product positioning camera. A 45-degree heat reflecting mirror is arranged in the light emitting cavity on one side of the galvanometer and can reflect laser and transmit visible light; the product positioning camera is mounted above the light emitting cavity and is aligned with an observation hole formed in the light emitting cavity; the product positioning and transplanting module comprises a jig and a dental cast discharging platform which are positioned below the light emitting cavity, a Z-direction jacking module for jacking the dental cast discharging platform, and a self-resetting contact type displacement sensor for detecting the height of a dental cast; the X-direction linear transplanting module and the Y-direction moving assembly are used for driving the self-resetting contact type displacement sensor to move. The two-dimensional code marking device is small in size, convenient to operate and capable of marking clear and uniform two-dimensional codes on the dental cast quickly and accurately.

The invention relates to the technical field of laser precision machining, in particular to a device and method for assisting a blue laser beam through water jet, and the device comprises a blue laser generation module which is used for generating a laser beam with the wavelength of 450-470 nm; the water jet guiding module comprises a high-pressure water pump and a three-stage filtering device; the machining head is coaxially coupled, and the aspherical lens focusing system and the nozzle assembly are integrated; the dynamic regulation and control unit comprises a temperature sensor arranged on the nozzle assembly and a pressure sensor arranged at the outlet of the water pump; and the open type thermal management system is connected with the processing area and the laser cooling cavity through a pipeline. By integrating the blue laser generating module, the water jet guiding module, the coaxial coupling machining head, the dynamic regulation and control unit and the open type thermal management system, systematic innovation is achieved, 450-470 nm blue laser is adopted, the absorptivity of a high-reflection material is improved, and the problem that traditional green laser is low in machining efficiency is solved.

The utility model relates to a kind of green laser, comprising: resonant cavity, for generating non-polarization base frequency light;Frequency doubling unit, for the non-polarization base frequency light is output green laser after frequency doubling. Resonant cavity is provided with: narrowband high reflection fiber grating, second end is connected with the signal fiber of first pump combiner;First pump source, tail fiber is connected with the pump fiber of first pump combiner;First pump combiner, forward use;Multi-clad fiber, first end is connected with the output fiber of first pump combiner, second end is connected with the input fiber of second pump combiner;Second pump combiner, reverse use;Second pump source, tail fiber is connected with the pump fiber of second pump combiner;Narrowband low reflection uniform fiber grating, first end is connected with the output fiber of second pump source;Optical power stripper, input end is connected with the second end of narrowband low reflection uniform fiber grating;High-power output head. The utility model can output green laser, simple structure, low in cost.

The invention discloses a temperature control self-compensation frequency doubling device and method for high-power output of green laser. According to the system, a thermoelectric device (TEC) serves as a core heat exchange assembly, current direction switching is achieved through an H-bridge driving circuit, and therefore two-way temperature control of heating and refrigerating is completed. When the temperature is higher than a set value, the G1 and G4 are driven to be conducted, and the current forwards flows through the TEC to realize refrigeration; and when the temperature is lower than a set value, the G2 and the G3 are driven to be conducted, and the current reversely flows through the TEC to realize heating. A PID algorithm is built in the control module, the PWM duty ratio is dynamically adjusted according to the temperature difference, the TEC current is finely controlled, and closed-loop temperature control is achieved. The system is also integrated with a light beam shaping unit for performing collimation, beam expansion or dodging processing on the output laser so as to optimize the light beam quality. The device is especially suitable for a 532nm green laser, and can effectively improve the light beam stability, the processing quality and the service life of the device.

The invention discloses a green optical fiber laser and a tunable green laser acquisition method. The green optical fiber laser comprises a blue pumping source, a dichroic mirror, a coupling aspheric lens, a gain optical fiber and a matching optical fiber which are sequentially arranged along a main optical axis, a plane blazed grating is arranged on one side of the dichroscope, and the plane blazed grating is obliquely arranged in a Littrow structure; the ends of the gain optical fiber and the matching optical fiber are connected through a ceramic bushing, and an optical fiber end face coated mirror is arranged at the joint; a laser resonant cavity is formed between the optical fiber end face coated mirror and the blazed grating; laser emitted by the blue light pumping source is sequentially transmitted through the dichroscope and focused to the gain optical fiber through the coupling aspherical lens, green light is formed under the ground state absorption effect, gain amplification is conducted, then the green light enters the laser resonant cavity, green light laser reversely propagating along the main optical axis is generated, and after passing through the coupling aspherical lens, the green light laser is reflected by the dichroscope to the plane blazed grating to be tuned; and green laser is output through zero-order diffraction. The laser is high in efficiency and power, and system complexity and cost are reduced.

A half-wave plate and a focusing lens are sequentially arranged on an output light path of an infrared laser with adjustable pulse width, the focusing lens is connected with a frequency doubling crystal, the frequency doubling crystal is connected with a frequency tripling crystal, an output end face of the frequency tripling crystal is cut into a Brewster angle, and the output end face of the frequency tripling crystal is connected with an infrared laser. The output infrared laser is shielded by the infrared light blocking block after being transmitted in the space, the output green laser is shielded by the green light blocking block after being transmitted in the space, the frequency tripling crystal is connected with the imaging lens, the imaging lens is connected with the input surface of the wedge-shaped lens, and the input surface of the wedge-shaped lens is cut into a Brewster angle. Through fine adjustment of the distance between the imaging lens and the frequency tripling crystal and the distance between the wedge-shaped lens and the imaging lens, the ultraviolet laser output by the wedge-shaped lens becomes circular and is output. The Brewster angle output surface of the frequency tripling crystal reduces the ultraviolet damage probability and separates infrared light, green light and ultraviolet light. The position of the imaging lens is finely adjusted to compensate a light spot ellipse caused by a walk-off effect during frequency doubling.

The invention discloses a device for improving the turn-off capability of a high-power green laser. Comprising a first output mirror, a frequency doubling crystal, a harmonic reflector, a first laser module, a 90-degree rotator, a second laser module, a first beam splitter, a 45-degree total reflective mirror, a first acousto-optic Q switch, a second acousto-optic Q switch, a third acousto-optic Q switch, a first total reflective mirror, a second total reflective mirror and a third total reflective mirror. The gain of the split light beam is reduced compared with the gain of the main optical axis light beam through light splitting, so that the turn-off capability of the acousto-optic Q-switch is improved. According to the invention, the laser output peak power is improved, and the Q-switched laser can be used in a high-power Q-switched laser requiring high turn-off capability.