197 results about "Blue laser" patented technology

The invention relates to a laser welding method suitable for a manganese-copper diverter, which comprises the following steps of: respectively splicing and tightly attaching two non-ferrous metal strips to two sides of a middle metal strip, and after the to-be-welded surfaces of the non-ferrous metal strips and the middle metal strip are positioned on the same horizontal plane, welding the to-be-welded surfaces of the non-ferrous metal strips and the middle metal strip; a near-infrared laser beam and a blue laser beam which are coaxial form a red-blue composite laser beam, the red-blue composite laser beam is used for conducting laser welding along the splicing gap of the non-ferrous metal strip and the middle metal strip, and during laser welding, the inclination angle between the red-blue composite laser beam and the vertical face of the surface to be welded is larger than or equal to 7 degrees. A light spot formed by the near-infrared laser beam swings in a light spot formed by the blue light laser beam, a welding seam is formed at the splicing position of the non-ferrous metal strip and the middle metal strip and penetrates through the non-ferrous metal strip to form a bonding layer, laser welding can be adopted only, the welding seam quality of laser welding is improved, welding spatter is reduced, and material overheating is avoided; and the consistency of product quality and the high efficiency of production are both considered, the production cost is reduced, and batch production is achieved.

The invention discloses an intelligent cutting control method and system for blue laser, and the method comprises the steps: carrying out the time domain analysis of the power time sequence data of a blue laser in real time, and obtaining the power fluctuation data; matching the power fluctuation data with a preset defect feature model of the blue laser to determine the defect occurrence probability of the blue laser; under the condition that the defect occurrence probability is determined to be greater than a preset probability threshold value, according to the cutting parameters and the material parameters, determining an initial power compensation parameter and a kerf quality optimization parameter through a compensation parameter calculation model; performing multi-target iterative optimization on the initial power compensation parameter, the kerf quality optimization parameter and the power fluctuation data through a self-adaptive deviation adjustment algorithm to generate a dynamic power control signal; and adjusting the output power and the beam focusing position of the blue laser according to the dynamic power control signal so as to correct the cutting path of the blue laser in real time.

The embodiment of the present application provides an aluminum-copper dissimilar metal composite laser welding method and an aluminum-copper welding joint, which relates to the field of laser welding technology. The aluminum-copper dissimilar metal composite laser welding method of the embodiment of the present application includes the following steps: S1, stacking and relatively fixing aluminum metal plates and copper metal plates to obtain parts to be welded; S2, combining blue laser, point infrared laser and ring infrared laser, and focusing them to the welding position on the surface of the parts to be welded to form a composite laser beam; S3, welding the parts to be welded in an oscillating manner by keeping the composite laser beam. The aluminum-copper dissimilar metal composite laser welding method and the aluminum-copper welding joint of the embodiment of the present application can reduce the porosity in the weld and improve the mechanical properties and ductility of the weld.

The invention provides europium-doped silicate green fluorescent powder as well as a preparation method and application thereof, and belongs to the technical field of luminescent materials. The green fluorescent powder can generate narrow-spectrum green light with the peak value located at 532 nm under excitation of 450 nm blue light, the full width at half maximum is 46 nm, a white light LED device prepared based on the fluorescent powder has a 110% NTSC color gamut, and it is indicated that the green fluorescent powder has excellent application value in backlight display. The saturation threshold value of the fluorescent powder reaches 21.6 W / mm < 2 > under the excitation of 450nm blue laser, and the lumen at the moment reaches 1157.9 lm. The green fluorescent powder disclosed by the invention has the advantages of high luminous efficiency, narrow full width at half maximum, high light saturation threshold under blue laser excitation, high lumen efficiency and the like, and has application feasibility in the aspect of laser display.

The invention belongs to the technical field of medical robots and minimally invasive surgery, and provides a robot control system and method for blue laser vaporization surgery of prostatic hyperplasia. Mapping the nuclear magnetic image volume data to a deformation field under an ultrasonic acquisition coordinate system, and deforming the preoperative nuclear magnetic image to an intra-operative ultrasonic space by using the deformation field to complete image registration; fusing the registered image with a stereoscopic vision system; the spatial depth of the surface of the target tissue is obtained from the endoscopic image so as to supplement navigation information; according to the utility model, the prostate deformation and probe posture change adaptive capacity in an operation is improved, the real-time visual closed-loop regulation and control capacity is improved, and the characteristics of small light spots, shallow heat diffusion, excellent hemostasis and the like of blue laser are combined, so that the vaporization and hemostasis precision in a tiny blood vessel dense area is ensured, and the problems of large tissue trauma and the like are avoided.

The invention belongs to the technical field of laser cladding processing, and provides a method for preparing an ablation-resistant copper alloy through a blue laser cladding process and the ablation-resistant copper alloy. The method comprises the following steps that alloy powder is subjected to ball milling, and mixed powder is obtained; the alloy powder is CuCr powder, CuW powder, ODS-Cu powder, SiO2 / Cu powder or C / Cu powder; and the mixed powder is used for preparing a cladding layer on a copper base material by adopting a blue laser cladding process. According to the method, the characteristic that a copper material is high in blue laser absorptivity is utilized, the problems of heat input accumulation, air holes, inclusions and the like under the conditions of low absorptivity and high energy density are avoided, and laser process parameters are controlled to form a molten pool on the surface of a copper base material; and the coaxial powder feeding device gathers the powder material into the molten pool for melting and rapid cooling and solidification by utilizing protective gas to form a cladding layer with excellent performance, so that the surface of the copper base material is modified, and the performance of the copper base material is improved.

The invention provides a copper alloy dual-wavelength laser synergistic pulsed magnetic field additive manufacturing device and method, and belongs to the field of additive manufacturing. The base is arranged right above the base plate and horizontally moves relative to the base plate; the blanking mechanism is arranged on the base and conveys powder materials to the base plate; the first laser is arranged on the base and emits blue laser towards the substrate; the second laser is arranged on the base and emits red laser towards the substrate; the blue laser irradiates the raw material and enables the powder material to form a molten pool on the substrate. The red laser irradiates the molten pool, inputs a heat source and expands the molten pool. According to the method, the irradiation starting time of the red and blue laser is designed, the power and the light spot area of the red and blue laser are adjusted, the molten pool formed by copper or copper alloy additive manufacturing can be finely regulated and controlled, and therefore the problems that in the additive manufacturing process, copper or copper alloy is low in forming efficiency and poor in compactness are solved.

The invention discloses a gallium nitride-based third-generation semiconductor blue laser, which sequentially comprises a substrate, a lower limiting layer, a lower waveguide layer, an active layer, an upper waveguide layer and an upper limiting layer from bottom to top, and is characterized in that a multi-state exciton induction layer is arranged between the lower waveguide layer and the lower limiting layer; the multi-state exciton induction layer comprises a first multi-state exciton induction layer, a second multi-state exciton induction layer and a third multi-state exciton induction layer. According to the invention, the multi-state exciton induction layer inhibits the annihilation of triplet excitons, reduces the dissipation of the triplet excitons, enhances the transfer of triplet energy, improves the generation efficiency of the triplet excitons, improves the number of long-life triplets, and improves the performance of the device. The radiation lasing of triplet excitons to the active layer of the laser element and the luminescence of singlet-triplet mixed self-confinement excitons are induced, the defect density is reduced, the excitation threshold value of the laser element is reduced, the quantum efficiency in a quantum well is improved, and the aging life of the quantum well is prolonged.

The invention relates to the technical field of hybrid bonding, in particular to a laser-assisted hybrid bonding interconnection method, which comprises the following steps of: S1, processing the surface of a wafer to enable the to-be-bonded surface of the wafer to be flat; s2, cleaning a to-be-bonded surface of the wafer, and removing organic pollutants and an oxide layer; s3, aligning and fitting the surfaces to be bonded of the two wafers; s4, enabling the to-be-bonded surfaces to comprise dielectric layers and metal interconnection points, irradiating the dielectric layers with infrared laser, and carrying out the interconnection of the dielectric layers of the two to-be-bonded surfaces; and S5, the metal interconnection points are heated by blue laser, and the metal interconnection points of the two surfaces to be bonded are interconnected. In the hybrid bonding stage, the infrared laser and the blue laser are used for bonding the dielectric layer and the metal interconnection point respectively, partitioned irradiation and differentiated heating of the metal interconnection point and the dielectric layer are achieved, the problems of interface warping, microcracks and other thermal damage are effectively avoided, and the interconnection quality and the packaging reliability are improved.

The invention relates to the technical field of laser welding, in particular to a 6-series aluminum alloy welding method and device with a magnetic field cooperating with time-sharing double-beam scanning, and the method comprises the steps that in the welding process, a blue light laser beam is used for scanning along a to-be-welded path in a spiral path, and a micro molten pool array is formed; after the blue laser beam stops scanning, a near-infrared laser beam concentric with a light spot of the blue laser beam is emitted at a preset time interval, and welding is conducted along a linear path deviating from the center line of the micro-molten pool array by a preset deviation amount; and during emission of the near-infrared laser beam, a constant magnetic field perpendicular to the welding surface is applied to the welding surface. The welding stability and the joint consistency of the 6-series aluminum alloy are improved, and the welding effect is effectively improved.

The invention provides an illumination system and projection equipment. The lighting system comprises a light source module, a wavelength conversion device, a first light guide assembly, a second light guide assembly and a micro-lens array module. The light source module is used for providing a plurality of green and blue laser beams. The wavelength conversion device is used for generating fluorescent light beams. The first light guiding assembly and the second light guiding assembly are used for guiding a fluorescent light beam and a green laser light beam respectively. The fluorescent light beams form fluorescent light spots on the first area of the first side face of the micro-lens array module. The plurality of green laser beams form a plurality of green light spots on a second area of the first side surface of the micro-lens array module. The first region is adjacent to the second region. The illumination system and the projection equipment provided by the invention avoid energy loss and have good light uniformity.

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 present invention relates to the technical field of semiconductor lasers, and particularly relates to a GaN-based blue laser and a preparation method thereof, including a substrate, on which an N-type GaN layer, an N-type lower confinement layer, an N-type lower waveguide layer, an active region, an upper waveguide layer, a P-type electron blocking layer, a P-type upper confinement layer, and a P-type contact layer are sequentially stacked; the P-type upper confinement layer is composed of at least one U-shaped GaN sub-layer and multiple layers of P-type In x Al y Ga 1‑x‑y N sub-layers stacked and compounded, where 0 ≤ x < y < 1, 0 < x < 1, 0 < x + y < 1. The present invention uses at least one U-shaped GaN sub-layer and multiple layers of P-type In x Al y Ga 1‑x‑y N sub-layers stacked and compounded to form the P-type upper confinement layer, which not only improves the crystal quality of the material, enhances the radiative recombination in the active region of the LD device, thereby improving the output optical power and photoelectric conversion efficiency of the LD, but also reduces the voltage and thermal loss of the LD device, and improves the aging life and other performance of the LD device.

An all-epitaxial, electrically injected surface-emitting green laser operates in a range of about 520-560 nanometers (nm). At 523 nm, for example, the device exhibits a threshold current density of approximately 0.4 kilo-amperes per square centimeter (kA / cm2), which is over one order of magnitude lower than that of previously reported blue laser diodes.

The invention discloses a laser light source-based baffle-free integrated automobile headlamp optical system, which comprises a low-beam laser light source, a high-beam laser light source, a low-beam focusing reflector, a high-beam reflection cup and a high-beam and low-beam light distribution lens, the high-beam and low-beam laser light source comprises a blue laser diode, a laser collimating lens, a laser focusing reflector and a curved reflector embedded with yellow fluorescent powder, and the low-beam focusing reflector and the high-beam reflection cup are used for reflecting light to the lower half portion and the upper half portion of the high-beam and low-beam light distribution lens respectively. The high-beam and low-beam light distribution lens is a double-free-form-surface lens of a segmented structure, the upper half portion of the lens is a two-section symmetrical fan-shaped lens and used for high-beam illumination, and the lower half portion of the lens is a four-section fan-shaped lens and used for low-beam illumination. According to the baffle-free dual-light integrated structural design, the weight of the headlamp can be effectively reduced, the size is reduced, and the system stability is improved.

The invention provides a titanium steel dissimilar metal welding device and method based on infrared laser and blue laser and application, and belongs to the technical field of hybrid welding, the device comprises a laser system installed on a six-axis mechanical arm, and the laser system comprises a beam splitting module, a blue laser collimation module and an infrared laser collimation module; the beam splitting module is connected with the CCD visual sensing module, the CCD visual sensing module is connected with the video monitor and the light path reflection device, the video monitor is connected with the terminal controller, the infrared laser alignment module is connected with the infrared laser, the blue laser alignment module is connected with the blue laser, and the blue laser alignment module is connected with the light path reflection device. The blue laser and the infrared laser are respectively connected with the water cooling device through pipelines, and the water cooling device is connected with the composite laser controller. The method is high in process flexibility, adapts to different thicknesses and joint types by adjusting the laser power and the wire feeding speed, overcomes the problems that a molten pool is unstable and interface bonding is poor in dissimilar metal welding, and provides a reliable scheme for complex structure welding.

The present invention discloses an integrated optical chip for augmented reality display and a preparation method thereof, belonging to the field of optoelectronics and display technology. The integrated optical chip includes a first end face coupler, a second end face coupler, and a third end face coupler, and the first end face coupler, the second end face coupler, and the third end face coupler are sequentially provided with a 2×2 multimode interference coupler, a microring filter, a 1×2 multimode interference coupler, an interlayer coupler, a thin-film lithium niobate phase shifter, a phase shifter control electrode, and a grating antenna array structure; wherein, the first end face coupler is used to couple an external red laser into the chip, the second end face coupler is used to couple an external blue laser into the chip, and the third end face coupler is used to couple an external green laser into the chip. This technical solution is used to solve the problem that the display system in the prior art is difficult to simultaneously meet the requirements of lightness, low power consumption, and high resolution.

The invention may be embodied in other forms than those specifically disclosed herein without departing from itMulti-kW-class blue (400-495 nm) fiber-delivered lasers and module configurations. In embodiments, the lasers propagate laser beams having beam parameter products of <5 mm*mrad, which are used in materials processing, welding and pumping a Raman laser. In an embodiment the laser system is an integration of fiber-coupled modules, which are in turn made up of submodules. An embodiment has sub-modules having a plurality of lensed blue semiconductor gain chips with low reflectivity front facets. These are locked in wavelength with a wavelength spread of <1 nm by using volume Bragg gratings in an external cavity configuration. An embodiment has modules having of a plurality of submodules, which are combined through wavelength multiplexing with a bandwidth of <10 nm, followed by polarization beam combining. The output of each module is fiber-coupled into a low NA fiber. In an embodiment a kW-level blue laser system is realized by fiber bundling and combining multiple modules into a single output fiber.

This invention discloses an injection-locked blue laser system, which injects a low-power, narrow-linewidth, and frequency-stable seed light into another high-power, wide-linewidth laser to obtain a high-power, narrow-linewidth, and frequency-stable laser. In this invention, by injecting a 5mW seed light, a 300mW slave light can be locked, and the system has a wavelength adjustment range of 6nm after locking. The main body of the laser system has a volume of 23×22×6cm. 3 After long-distance transport, it only requires adjustment of the internal fiber optic coupler to function normally. The advantages of this invention are: it realizes a portable, tunable 6nm wavelength, 300mW output power, low manufacturing cost, and easy-to-operate 480nm blue laser system. Furthermore, this injection-locking method can also be used in other optical bands, with the output power limited by the performance of the laser diodes within the laser system. This invention provides a new approach for the development of portable high-performance laser systems and has extremely high application value.

The gallium nitride-based semiconductor blue laser chip comprises a substrate, a lower coating layer, a lower waveguide layer, an active layer, an upper waveguide layer and an upper coating layer which are sequentially arranged from bottom to top. The distribution characteristic of density in the lower waveguide layer of the gallium nitride-based semiconductor blue laser chip is specifically designed, so that the lower waveguide layer forms a lower waveguide layer for inhibiting optical catastrophe, the density distribution of the lower waveguide layer is regulated and controlled, thermal degradation and thermal mismatch of an active layer are inhibited, non-radiative recombination is reduced, the optical catastrophe is inhibited, and meanwhile, the optical catastrophe is inhibited. Longitudinal, transverse and lateral drift uniformity of carriers in an active area is improved, the heat conduction efficiency of a laser cavity is improved, heat accumulation in the laser is reduced, the coupling rate of pump light to an upper energy level of laser is improved, waste heat and laser gain saturation are inhibited, and the laser efficiency is improved. And the hole burning effect caused by self-focusing and beam distortion due to uneven thermal stress and increase of the refractive index is reduced, so that optical catastrophe is inhibited.

The application provides an objective refraction system and method of refractive state, comprising: a laser light source emitting three beams of blue laser, green laser and infrared laser, an optical beam splitter splitting the three beams into a reference light path and a measurement light path; a plane mirror reflecting the reference light path back to the original path and being received by an interference measurement device; a light adjusting device refracting the measurement light path to realize range measurement of a measurement object, the refracted measurement light path being reflected back to the original path by the measurement object and then being received by the interference measurement device; then, the interference measurement device obtains an interference measurement signal according to the incident measurement light path and the reference light path, a data processing device obtains refractive factor data of the measurement object according to the interference measurement signal, and obtains refractive refraction data of the measurement object according to the refractive factor data. The application can realize the ophthalmic examination that can be completed by multiple devices through one measurement, can quickly understand the real state of the eyeball and judge the myopia condition, and improves the myopia examination efficiency.

The invention provides a BC battery bus bar laser welding device and a welding method thereof, and the BC battery bus bar laser welding device comprises a laser composite head which comprises a blue light laser assembly, an infrared laser assembly and a CCD assembly; the blue laser assembly comprises a blue lens, a first reflector and a second reflector; the infrared laser assembly comprises an infrared lens, a third reflector and a red-blue composite lens; the CCD assembly comprises a CCD camera, a CCD monitoring lens and a fourth reflecting mirror which are arranged in sequence; the red and blue composite laser emission source is connected with the laser composite head through a composite optical fiber; the machining platform comprises an X-axis moving assembly, a Y-axis moving assembly and a machining platen. According to the invention, a plurality of bus bars and batteries can be efficiently welded, the uniformity is high, the welding effect is good, surfacing and hole explosion are avoided, the yield is high, the efficiency is high, and the stability is strong.

The utility model relates to the technical field of lasers, and particularly discloses a blue laser, which comprises a leveling device, a shell, a transmission rod, a power device, an optical module, a heat dissipation module, a quick plug, a flow rate adjusting ring, a circuit board, an air tap and a smoke sensor, the transmission rod, the power device, the optical module, the heat dissipation module, the circuit board, the air tap and the smoke sensor are all arranged in the shell, the output end of the power device is connected with one end of the transmission rod, the other end of the transmission rod is connected with the flow speed adjusting ring arranged in the air tap, and the quick plug penetrates through the shell to be connected with the air tap. The smoke sensor is in communication connection with the circuit board, and the leveling device is installed on any side outside the shell. The blue laser can be matched with air flows with different flow speeds according to smog with different concentrations, and scattering influence of the smog on laser is protected to the greatest extent, so that cutting precision is improved.

The present invention provides a all-solid-state laser that directly emits 486.1 nm blue laser based on a praseodymium-doped fluoride crystal. The laser includes an excitation source, a focusing system, a laser resonator, and a laser gain medium crystal. The excitation source is a laser diode laser that emits laser with a central wavelength of 440 - 445 nm; the laser resonator is composed of an input mirror and an output mirror coated with a film system for realizing blue laser; the laser gain medium crystal is a fluoride crystal doped with praseodymium ions. By using the Pr 3+ ion 3 P0→ 3 H4 energy level transition to directly emit 486.1 nm wavelength blue laser, the signal-to-noise ratio of the laser can be improved. The blue laser fabricated by the present invention has the advantages of simple and compact structure, high stability, good monochromaticity, small volume, low power consumption, etc. And by means of Q-switching, a high peak power blue laser pulse output can be obtained, which can meet the requirements of high power and high integration miniaturized blue lasers for ocean exploration and underwater communication.

The invention relates to the technical field of display, and discloses a light source system and projection equipment, the light source system can separate light paths after fluorescence and blue laser are emitted from a fluorescence wheel, the blue laser can pass through a diffusion area of the fluorescence wheel twice for diffusion, the speckle problem can be reduced, and light spots are more uniform; the fluorescent wheel is integrated with a fluorescent area and a diffusion area, so that the driving device can drive conveniently, and the size of the light source system can be reduced.

The invention discloses a device for manufacturing a magnesium-based composite material through a follow-up magnetic field assisted infrared and blue light composite laser additive and application of the device, and belongs to the technical field of metal-based composite material preparation. Through wavelength complementation of infrared laser and blue laser and interaction of thermocurrent driven by a thermoelectric effect and a follow-up magnetic field, the stability of a molten pool in the process of laser directional energy deposition of the magnesium-based material is remarkably improved, the defects of pores and the like are reduced, uniform distribution and ordered orientation of reinforced particles in a matrix are achieved, and the mechanical property of the magnesium-based material is improved. And meanwhile, the yield strength, ductility and compactness of the magnesium alloy material are improved, and the forming process is stable, safe and reliable.

The invention relates to a manufacturing method of a glass-based small-spacing display screen, which comprises the following steps: preparing a substrate: selecting a high-strength ultra-thin glass substrate, carrying out surface cleaning and pretreatment of coating a conductive material, selecting and installing a light source: selecting a blue laser diode (LD) or high-efficiency OLED light source material, and installing the light source; the light source units are accurately installed on the substrate through the laser positioning and automatic surface mounting technology, the distance between the light sources is controlled within 1 mm, heat management design is conducted, specifically, the surface of the substrate is coated with a high-heat-conduction graphene film, and heat dissipation channels and micro-channel structures are designed, so that more efficient heat dissipation is achieved. By adopting a blue laser diode (LD) or efficient OLED light source material, the light source efficiency of the display screen can be remarkably improved, power consumption is reduced, the stability of a light source is improved, and the service life of the light source is prolonged. The high-efficiency light-emitting capability of the laser diode enables the display effect to be more uniform, the attenuation problem of a traditional LED light source under high brightness is avoided, and the service life of the display screen is prolonged.

The application provides a gallium nitride-based semiconductor blue laser, which comprises, from bottom to top, a substrate, a lower limiting layer, a lower waveguide layer, an active layer, an upper waveguide layer and an upper limiting layer, wherein a topological interface state layer is arranged between the upper waveguide layer and the upper limiting layer, and the topological interface state layer has breakdown field strength distribution characteristics and electron affinity energy distribution characteristics. Through the specific breakdown field strength distribution and electron affinity energy distribution of the topological interface state layer, a new body boundary energy band is formed, a strong spin center is formed at the interface, the coupling between adjacent interface states and the spin-splitting asymmetry of the electron band structure are enhanced, the spin-orbit torque effect is enhanced, the piezoelectric polarization and the thermal stress mismatch of the laser element are relieved, the valence band step is reduced, the uniformity of the valence band step is improved, the uniformity of the carrier injection into the active layer is improved, and the gain uniformity is improved.

To provide a light source device that can be reduced in size, and a projection apparatus including the light source device.SOLUTION: A light source device 60 comprises: a blue laser diode 71 that emits blue wavelength band light; a red light emitting diode 81 that emits red wavelength band light; a light path switching device 142 that is disposed on a light path of the blue wavelength band light emitted from the blue laser diode 71 and switches the incident blue wavelength band light between a light path in a first direction D1 and a light path in a second direction D2; a fluorescence emitting device 100 that is disposed on the light path in the second direction D2 and has a fluorescence emitting region that emits fluorescence including green wavelength band light using the blue wavelength band light as excitation light; and a light source optical system 140 that guides the blue wavelength band light switched to the light path in the first direction D1 by the light path switching device 142, the red wavelength band light emitted from the red light emitting diode 81, and the fluorescence emitted from the fluorescence emitting region to a combined light path.SELECTED DRAWING: Figure 3

The utility model provides a wireless optical communication transmission device suitable for an underwater unmanned platform, and the device comprises a blue light communication machine and a green light communication machine, the blue light communication machine employs blue laser as a communication carrier to transmit an Ethernet signal, and the green light communication machine employs green laser as a communication carrier to transmit the Ethernet signal, thereby achieving the underwater bidirectional data transmission. According to the utility model, bidirectional data transmission can be realized underwater, and the application of real-time large-capacity data exchange is supported.