655 results about "Laser technology" patented technology

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 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 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 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 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 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.

This application relates to the field of laser technology and provides an integrated fiber coupling device and apparatus. The device includes a beam combining module and a coupling filter module integrated within a housing. The beam combining module polarizes and combines the laser beam, which is then coupled into a fiber combiner via a first fiber and output as a second fiber. The output is then filtered by a cladding filter unit and output through a nozzle. The coupling filter module contains multiple fixed cavities with curved walls. The first fiber at the input end of the fiber combiner and the second fiber at the output end are respectively fixed in curvature by adhering to the corresponding curved walls before output. This device improves beam quality and overall heat dissipation efficiency. The curved wall structure fixes the curvature of the fiber, reducing fiber stress and bending radius, thus solving the problems of excessive bending stress and insecure fiber fixation in existing coupling units, which lead to poor stability and reliability of laser output.

The invention discloses a large-scale rotary equipment blade three-dimensional profile measurement and point cloud splicing method and system based on line laser, and belongs to the technical field of precision measurement and computer image processing. Reading a CAD model of a to-be-measured blade, extracting geometric features of the blade by a system, and analyzing the geometric features to generate a plurality of measurement path candidate sets; a measured blade is fixed on a rotary table, a multi-dimensional measurement movement mechanism is adopted to carry a line laser sensor to scan the surface of the blade step by step according to a planned final path, and accurate three-dimensional point cloud data is obtained; the method comprises the following steps: after acquiring point cloud data of a blade, initially aligning the scanned point cloud data in combination with position information of equipment; the optimized ICP algorithm is used, a transformation matrix between the point clouds is continuously adjusted through an iteration mode, the distance between the point clouds is minimized, mismatching and noise influences are further reduced, and therefore accurate registration is achieved. The invention aims to solve the problems of low precision and poor efficiency of aero-engine blade three-dimensional profile measurement.

The invention provides a laser crystal heterogeneous bonding method and an optical element, and relates to the technical field of laser, and the method comprises the steps: carrying out the ultra-precise surface treatment of the to-be-bonded surfaces of a laser crystal and a heterogeneous material based on the laser crystal and the heterogeneous material; respectively depositing at least one transition layer on the two to-be-bonded surfaces after surface treatment through a physical or chemical deposition method; the outermost layers of the two transition layers are made of the same material; carrying out ion beam activation treatment on the two surfaces to be bonded on which the transition layers are deposited so as to form high-activity surfaces; and aligning the two activated surfaces to be bonded in a vacuum environment at room temperature and applying pressure, and realizing room-temperature bonding through electrostatic force and chemical bond action to obtain a bonding body of the laser crystal and the heterogeneous material. According to the invention, thermal-mechanical property and chemical property differences among heterogeneous materials are overcome, and high-strength, low-stress and high-optical-quality bonding is realized.

The invention provides a high-power wide-spectrum long-wave infrared femtosecond laser generation method, and relates to the technical field of infrared ultrafast laser. According to the method, the 1.5 [mu] m pumping BGSe crystal is adopted, compared with a traditional 1 [mu] m pumping BGSe crystal, the heat accumulation effect is greatly reduced, and the operation stability of the system is remarkably improved in combination with a water-cooling heat dissipation device. Through crystal cutting angle optimization and phase matching design, 10-16 [mu] m wide-spectrum long-wave infrared femtosecond laser output is achieved, the power reaches 100 mW, and the application requirements in the fields of molecular spectrum recognition, environment monitoring and the like are met.

The invention relates to a high-power dual-wavelength erbium-doped solid laser, and belongs to the technical field of laser. The high-power dual-wavelength erbium-doped solid laser comprises a pumping source, a pumping cavity, a diamond, a heat sink, a first resonant cavity and a second resonant cavity, the first resonant cavity comprises a first erbium-doped YAG slice crystal, and the second resonant cavity comprises a second erbium-doped YAG slice crystal. The first erbium-doped YAG sheet crystal is used for generating 1.64 [mu] m laser which oscillates back and forth in a back-and-forth light path provided by the first resonant cavity; and the second erbium-doped YAG sheet crystal is used for generating 2.94 [mu] m laser which oscillates back and forth in a back-and-forth light path provided by the second resonant cavity. According to the high-power dual-wavelength erbium-doped solid laser provided by the invention, synchronous output of 1.64 mu m and 2.94 mu m dual-wavelength laser is realized, the multifunctionality and medical adaptability of the laser are enhanced, and multi-type treatment requirements of soft tissues and hard tissues can be met at the same time.

A space-based microwave and laser fused ocean subsurface layer temperature field reconstruction method solves the technical problems that current ocean subsurface layer temperature profile acquisition lacks direct participation of subsurface layer parameters and the reconstruction precision is low, and the ocean subsurface layer temperature field reconstruction method comprises the following steps: step 1, determining an error of laser radar inversion ocean subsurface layer temperature; 2, generating an input data set and an output data set; 3, constructing a sub-surface layer temperature profile reconstruction model, and performing training; and step 4, performing efficiency evaluation on the trained model. According to the method, the temperature field reconstruction precision is remarkably improved, and the traditional technical limitation depending on a pure sea surface parameter model is broken through.

The invention belongs to the technical field of laser, and particularly discloses a beam shaping system and method based on prism pair orthogonality and cascade, and the system comprises a single-mode fiber, an aspherical lens, a first prism pair, a first parallel plate, a second prism pair and a second parallel plate which are sequentially arranged along the direction of an optical axis. A Gaussian beam emitted by a single-mode optical fiber is collimated by an aspherical lens to form a parallel beam, the beam is expanded or compressed in the X direction by a first prism pair, the beam is expanded in the Y direction by a second prism pair, and two inclined parallel plates are respectively used for compensating the beam offset in the X / Y direction; according to the invention, the circular Gaussian beam emitted by the single-mode fiber can be shaped, a large strip-shaped collimation light spot with an adjustable length-width ratio from 4: 1 to 20: 1 and a long axis size of 30mm can be realized, and the central positions of the input and output beams in the cross section are ensured to be unchanged.

The invention relates to the technical field of laser, and discloses a high-power infrared spatial optical fiber coupling device and method, and the device comprises a light beam stabilizing system, a power adjusting unit, a core coupling light path, and an optical fiber fixing unit. The light beam stabilizing system is used for carrying out pointing stabilization and collimation processing on the incident high-power infrared space light; the power adjusting unit is arranged on the light output side of the light beam stabilizing system, the light input end of the power adjusting unit corresponds to the light output end of the light beam stabilizing system, and the power adjusting unit is used for receiving the stabilized light beam output by the light beam stabilizing system and adjusting the laser power entering the core coupling light path; the core coupling light path is used for accurately focusing the stabilized light beam to the end face of the optical fiber; the optical fiber fixing unit is arranged on the output end side of the core coupling light path and used for stably clamping an optical fiber and enabling the end face of the optical fiber to be located at a focusing light spot; the optical fiber fixing unit is arranged on the light output side of the core coupling light path and used for clamping the optical fiber to be coupled so as to receive the focused light beam output by the core coupling light path.

The invention relates to a multi-path high-stability narrow-linewidth external cavity semiconductor laser and application thereof, and belongs to the technical field of lasers. The laser comprises two groups of external cavity light paths, Z-block beam combiners, partial reflectors and isolators, the two groups of external cavity light paths are arranged side by side, and the Z-block beam combiners, the partial reflectors and the isolators are sequentially arranged on the light emitting sides of the two groups of external cavity light paths; the external cavity optical path comprises a gain chip, a collimating lens, a polarization analyzer A, a polarization beam splitter, an F-P etalon and a narrow-band-pass filter which are sequentially arranged along the optical path. The polarization analyzer and the polarization beam splitter are arranged in the external cavity light path, main polarized light is kept to resonate in the external cavity light path, the polarization suppression ratio of the external cavity light path is improved, non-dominant mode noise is suppressed, and the line width is reduced; the mode jump risk is reduced, the device life is prolonged, and the power stability is improved; the beam quality is improved; and the polarization dependent loss in a light path is reduced.

The invention relates to the technical field of laser, and discloses a button laser carving device which comprises a first positioning assembly, a second positioning assembly and a laser carving laser head, accurate and flexible button positioning can be achieved through the first positioning assembly and the second positioning assembly, the position of a button is effectively fixed through a positioning block and a positioning groove, and the laser carving efficiency is improved. And the second positioning assembly is provided with a variable-diameter fixing groove and a positioning clamp, so that the adaptability to buttons with different sizes is enhanced, the compatibility to the buttons with different specifications is effectively improved, and meanwhile, the precision and the consistency of laser etching patterns are also ensured. Besides, the carrying mechanism is matched with a rotating motor through a feeding suction nozzle, the rotating motor and the feeding suction nozzle on the rotating motor are driven by a driving assembly to move along set tracks in the first direction and the second direction, flexible and independent carrying of the buttons is achieved, and the stability of the single button in the carrying process is ensured; and machining interruption or errors caused by clamping or position deviation due to simple linearity are avoided.

The invention relates to the technical field of laser, and provides a pulse width adjustable laser, which comprises a light emitting assembly and a resonant cavity length adjusting assembly, and is characterized in that the light emitting assembly is used for emitting laser; and the resonant cavity length adjusting assembly is used for adjusting the length of the resonant cavity through which the laser passes. The invention also provides a pulse width modulation method of the laser, which comprises the following steps of: S1, preparing the light emitting component, and emitting laser by adopting the light emitting component; s2, using the resonant cavity length adjusting assembly to adjust the length of the resonant cavity; s3, the resonant cavity length adjusting assembly with the adjusted resonant cavity length receives the laser and outputs the laser, the resonant cavity length adjusting assembly is adopted to adjust the length of the resonant cavity through which the laser passes, and therefore the pulse width from the nanosecond level to the microsecond level can be output, and the requirement for different detection distances of the laser radar can be met.

The invention discloses a comb plate and step gap detection method and device based on a line laser technology. The comb plate and step gap detection method comprises the steps of 1) obtaining system prefabricated elevator specification data; 2) acquiring test environment configuration data; 3) ensuring that the laser scanning line accurately falls on the same straight line of the comb tooth tip and the step, identifying a step boundary image by a camera, and judging the starting position of the step; 4) starting to mark a cascade number, and starting first detection sampling; 5) identifying the step boundary image by the camera, and judging the step end position; 6) starting the last detection sampling; and 7) after all the steps are tested, outputting whether the detected steps and the comb plate are qualified or not, marking the defective steps, and outputting numbers. Based on the characteristics of the line laser, the advanced line laser measurement technology is adopted, the resolution ratio of the measurement system can reach the micron level, large-area and high-density data acquisition becomes possible due to the high-speed scanning capability, and the measurement efficiency is greatly improved.

The invention relates to the technical field of lasers, and discloses a parameter design method of an optical system, the optical system, a device and electronic equipment, the optical system comprises a laser, an optical fiber and a collimating lens, the optical fiber is a rectangular optical fiber with a rectangular core layer or a barrel-shaped optical fiber with a barrel-shaped core layer, and the method comprises the following steps: according to the size and imaging distance of a first light spot, determining the size of the first light spot; determining the residual divergence angle of the laser after passing through the collimating lens; determining the focal length of the collimating lens according to the residual divergence angle and the side length of the core layer; according to the ratio of the focal length to the side length of a core layer, whether the optical fiber is determined to be a barrel-shaped optical fiber is determined, and the core layer of the barrel-shaped optical fiber is composed of a plurality of arcs; and under the condition that the optical fiber is a barrel-shaped optical fiber, determining the curvature radius corresponding to each arc in the plurality of arcs according to the focal length and the side length of the core layer. According to the invention, distortionless rectangular homogenized light spots can be obtained under a large divergence angle.

The application provides a wind turbine array wake management method and system based on Doppler laser wind measurement, relates to the field of laser technology, and comprises the following steps: deploying a Doppler laser radar in a wind turbine array, collecting real-time wind speed data, wind direction data and turbulence intensity data in front and back directions of each wind turbine; establishing a wake influence model containing a wake influence coefficient, a decay coefficient and a diffusion coefficient based on the data, and calculating a wake influence range, a loss power and a recovery distance; and accordingly, the wind turbine array is controlled in coordination, the yaw angle or the pitch angle of the upstream wind turbine and the rotating speed of each wind turbine are adjusted, and the power generation efficiency of the wind turbine array is optimized. The application improves the wind speed data collection accuracy of the wind field, enhances the accuracy of the wake influence evaluation, and significantly improves the overall power generation efficiency of the wind field.

The invention relates to the technical field of lasers, and provides a double-gain-medium Q-switched laser and a constant-power pulse width adjusting method.The laser comprises a first pumping source, a second pumping source, an optical fiber beam combiner, a beam shaping system and a laser resonant cavity, the laser resonant cavity comprises a reflecting mirror, a first gain medium, a second gain medium, a polarization selector, a quarter-wave plate, a Q switch and an output mirror which are arranged in sequence; the first gain medium is used for absorbing first pumping light, the second gain medium is used for absorbing second pumping light, and the pumping power of the first pumping source and the pumping power of the second pumping source can be independently controlled. By changing the pumping power of the two pumping sources, real-time adjustment of the pulse width of the laser under the constant output power is achieved, the structure is compact, and control is easy and convenient.

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

In the field of ultrastable laser technology, tuning an ultrastable laser maintains its performance indicators without increasing additional lock noise and out-of-loop drift. [Solution] One acoustic-optic modulator and one electro-optic modulator are introduced separately, and the laser device, frequency shift unit, PDH frequency stabilization control unit, and ultra-stable cavity are integrated. [Effects] By changing the frequency of the acousto-optic modulator, high-precision tuning of the ultra-stable laser can be achieved. By changing the frequency of the electro-optic modulator, wide-range tuning of the ultra-stable laser can be achieved, enabling wide-range, high-precision, and dead-zone-free frequency tuning.

This invention relates to the field of laser technology, specifically to a three-optical-path integrated PDH frequency stabilization system. It includes a three-laser input module, an integrated optical module, and three independent servo control modules. The three-laser input module provides three laser beams to be stabilized. The integrated optical module integrates the functions of the three independent optical paths onto a single substrate, achieving separation of transmission, beam combining, and reflected light. Simultaneously, it receives the three reflected beams and converts them into three electrical PDH error signals. The three independent servo control modules receive the three error signals respectively, process them, and generate feedback control signals, which are fed back to the corresponding three lasers to complete three independent frequency-locking loops. This invention significantly reduces the system's size and cost. The integrated optical module achieves compact integration of the three optical paths, improving system stability and anti-interference capabilities, reducing debugging difficulty, and ensuring system consistency.

The application discloses a 2 mu m wave band GHz solid mode-locked device based on electric regulation, belongs to the technical field of ultrafast laser and semiconductor device, and comprises a high-brightness fiber laser pumping source, an optical focusing coupling system for focusing and collimating the pumping source, a first input mirror for transmitting and reflecting the focused laser beam, a gain medium for generating and amplifying laser, a second input mirror and a third input mirror for reflecting the focused laser beam, and a two-dimensional Bi2O2Se electro-optic modulation device for modulating the laser beam. The application develops the two-dimensional Bi2O2Se electro-optic modulation device with low saturation flux, fast saturation recovery time and moderate modulation depth, so as to break through the technical barrier of solid GHz femtosecond mode-locked.

This invention relates to the field of semiconductor laser technology, specifically to a method for fabricating the p-side pads and ID region of a GaN laser, and a GaN laser itself. The method includes the following steps: S1, fabricating a first metal layer in the pad region and the ID region on a wafer; S2, fabricating a second metal layer on the first metal layer in the pad region; S3, patterning and etching the first metal layer in the ID region to form the ID pattern. This invention first fabricates the first metal layer in the pad region and the ID region, then fabricates the second metal layer on the first metal layer in the pad region, and then etches the first metal layer in the ID region to form the ID pattern. This allows for a more accurate ID pattern and reduces the likelihood of distortion.

This application discloses an optical parametric oscillator and a laser generating device, relating to the field of laser technology. The optical parametric oscillator includes a first optical fiber, a mirror assembly, a nonlinear crystal, and a second optical fiber. The first optical fiber has a first receiving end and a first output end. The first receiving end is used to receive pump light. The second optical fiber has a second receiving end and a second output end. Light output from the first output end can be transmitted to the second receiving end via the mirror assembly and the nonlinear crystal. The second output end is used to output signal light. The mirror assembly includes multiple mirrors. The nonlinear crystal is located in the optical path between two mirrors. A first grating is disposed on the first optical fiber, and a second grating is disposed on the second optical fiber. Both the first and second gratings are fiber Bragg gratings. Because this application uses a first optical fiber and a second optical fiber to define the light transmission path, compared to a free-space optical path, the optical fiber can be coiled, which is beneficial for reducing the overall size and improving integration.

The invention relates to the technical field of ultrafast laser, in particular to an ultraviolet laser damage inhibition method and device for a fused quartz optical element, and the method comprises the steps: obtaining oxy-18 modified DKDP crystals with oxy-18 isotope abundance higher than natural abundance; preparing the oxy-18 modified DKDP crystal into a wave plate matched with a preset ultraviolet laser wavelength; in an ultraviolet laser light path of a laser inertial confinement fusion device, a wave plate is arranged between a linear polarization state output end of ultraviolet laser and a fused quartz optical element; and enabling ultraviolet laser to sequentially pass through the linear polarization state output end and the wave plate to form circularly polarized light, and irradiating the circularly polarized light to the fused quartz optical element. The invention aims to realize the small-scale self-focusing effect of actively inhibiting fused quartz and solve the technical problem that a traditional material cannot be used as a large-aperture wave plate due to over-high transverse stimulated Raman scattering.

The invention discloses a mid-infrared laser based on three-device on-chip integration and a preparation method thereof, relates to the crossing field of a semiconductor laser technology and an optical communication technology, and solves the problem that the existing quantum cascade laser QCL technology cannot give consideration to both high modulation rate and high power. An intermediate infrared laser comprises a QCL unit, an EAM unit and an SOA unit which are sequentially arranged on a substrate. The substrate comprises a semi-insulating InP (Indium Phosphate); the QCL unit, the EAM unit and the SOA unit share the same ridge-shaped waveguide structure and grow through epitaxy butt joint. The method provided by the invention is suitable for a mid-infrared band space communication scene with high requirements on the laser modulation rate, the output power and the single-mode stability.