38 results about "Lens effect" patented technology

The invention discloses a high-performance infrared focal plane detector based on a super-structure lens effect, and belongs to the technical field of photoelectric detection. The core of the invention lies in providing a novel detector architecture which carries out integrated collaborative design on metal microcavity resonance and a super-structure lens condensation effect at a pixel level. Multi-physical field collaborative optimization is carried out on a quantum well material, a metal microcavity structure and an array period, so that periodically arranged detector pixels simultaneously have dual functions of microcavity resonance frequency selection and microlens wavefront regulation and control. On one hand, incident infrared light is converged through a super-structure lens effect induced by an array period, and the energy density of a light field is enhanced; on the other hand, incident light coupled into the metal microcavity can excite a resonance mode in the microcavity, and the active area light field is further locally strengthened. According to the invention, additional optical elements are not needed, the process is completely compatible with the existing focal plane technology, and a brand new technical approach is provided for high-performance narrow-band infrared detection.

The invention discloses a cavity parameter optimization method for a bicrystal regeneration amplification structure. The bicrystal regeneration amplification structure to be optimized comprises an optical resonant cavity, two gain crystals arranged in the optical resonant cavity, a pumping source, a pumping light path system matched with the gain crystals, an optical switch arranged in the optical resonant cavity and a reflector used for forming the resonant cavity, the method comprises the following steps: determining the relative position and spacing of two gain crystals in an optical resonant cavity; calculating and designing the physical cavity length of the optical resonant cavity according to the electro-optical switch response time of the optical switch; the curvature radius of the reflector is calculated and selected according to the thermal lens effect possibly generated by the gain crystals under high-power pumping, and the pumping power distribution of the pumping light path system to the two gain crystals is optimized according to the output power of the pumping source and the thermal performance of the two gain crystals. And pumping energy and heat load generated by the pumping energy are dispersed on the two gain crystals.

The invention relates to the technical field of filter membrane processing, and discloses a preparation method and a preparation system for preparing a through-hole filter membrane by using reflective Bessel laser. The preparation system for preparing the through hole filter membrane by using the reflection type Bessel laser comprises a light beam shaping assembly and a transmission assembly, the beam shaping assembly is used for reflecting and converting the incident laser into a Bessel beam; the transmission assembly is arranged on a light path of the Bessel beam and used for transmitting a non-diffraction area of the Bessel beam to a machining station. By arranging the beam shaping assembly, the incident laser can be reflected and converted into the Bessel beam instead of being transmitted to form the Bessel beam. The reflective design can avoid energy absorption of a transmission element, and is suitable for long-time high-power processing; the reflection type design does not need to consider the transmissivity of the material, and can support the incident laser from the ultraviolet band to the infrared band; the reflective design has no thermal lens effect, and the focal depth stability of a Bessel beam diffraction-free area is high.

The utility model discloses a detachable projection bulb, and relates to the technical field of projection lamps, the detachable projection bulb comprises a first lamp holder, a lamp wick and a transparent second lamp holder, the first lamp holder is detachably connected with the second lamp holder, the lamp wick comprises a lamp bead and a rubber plug, and the rubber plug is embedded in a cavity of the first lamp holder; the lamp bead is detachably connected with the rubber plug and extends into the cavity of the second lamp holder; the lower portion of the second lamp cap is clamped with the base body, the base body is detachably connected with the lamp tube, and a projection assembly is arranged in the lamp tube. Through the detachable design of the first lamp holder and the second lamp holder, the lamp beads can be detached and replaced in time after being damaged. The projection bulb is of a multi-sealing waterproof structure design, the outdoor waterproof effect is effectively improved, and the projection bulb is suitable for different outdoor decorative lamp strings. The projection sheet in the projection bulb can be replaced, for example, the projection sheet conforming to the scene can be replaced in Christmas and Halloween, and through the multiple convex lens effects of the small convex lens and the large convex lens, the projection modeling is clearer, and the effect is better.

The invention belongs to the field of galvanometer laser welding, and particularly relates to double-head quasi-synchronous laser welding equipment which comprises a rack and a displacement mechanism mounted at the top, and the displacement mechanism is used for adjusting different positions to weld workpieces; the welding mechanism is mounted on the displacement mechanism and is used for welding the workpiece; the first treatment mechanism is installed on the welding mechanism and used for blocking chippings generated during welding and meanwhile conducting cooling treatment on the edge and the front face of the galvanometer body; through air seal protection and rotary heat dissipation of the first processing mechanism, welding scraps and dust are intercepted, accumulated heat on the outer edge of the galvanometer body is rapidly guided out, and impurity attachment and lens thermal deformation are avoided; and the second treatment mechanism realizes removal of harmful substances and impact type cooling of the bottom surface of the galvanometer through purification, refrigeration and recovery of hot flue gas in a closed loop, so that the environment-friendly working environment is guaranteed, a heat dissipation system is formed by the second treatment mechanism and the first treatment mechanism, the thermal lens effect is effectively inhibited, and the service cycle of the galvanometer and core components is remarkably prolonged.

The invention discloses a gradient refractive index lens-based beam shaping optical system and a design method thereof, the optical system comprises at least one divergent gradient refractive index lens and at least one convergent gradient refractive index lens, and the divergent gradient refractive index lens and the convergent gradient refractive index lens are combined and configured along the same optical axis. The arrangement sequence of the gradient refractive index lenses and the relative position relation of the gradient refractive index lenses in the optical axis direction are designed, so that the optical system forms an afocal light path structure on the whole. The optical system is used for carrying out transverse scale regulation and control on an incident light beam and realizing light beam expansion, light beam shrinkage and light beam shaping on the premise of keeping approximate collimation propagation characteristics of an output light beam. According to the structure, the thermal lens effect in high-power laser can be avoided, the stability and reliability of the system are improved, tight attachment, cascade expansion and direct coupling with optical fibers are supported, and miniaturization and integration application is facilitated.

The invention discloses a data line ice-permeable sheath forming mold, and relates to the technical field of injection molding. The data line ice penetration sheath forming mold comprises a first movable mold base, a first fixed mold base is arranged on the right side of the first movable mold base, a second movable mold base is arranged on the back of the first movable mold base, a second fixed mold base is arranged on the right side of the second movable mold base, and a first mold body is arranged between the first movable mold base and the first fixed mold base. And a second mold main body is arranged between the second movable mold base and the second fixed mold base. According to the data line ice-permeable sheath forming mold, the first mold body and the second mold body are made of SR136 steel, mirror polishing treatment is carried out on a cavity of the mold, a split type design is adopted for an injection mold, and meanwhile, an ox horn gate is arranged for injection molding, so that the problem of the appearance of an ice lens surface outer mold glue line closing can be solved; and meanwhile, the ice lens surface effect is better, so that the final data line ice-permeable sheath forming piece has better appearance quality.

Embodiments of the present application provide an image processing method, device and equipment, and relate to the technical field of computers, in particular to the technical field of image processing. The specific implementation scheme is: obtaining a beauty lens image and a face image to be tried on with the beauty lens; segmenting an iris local image containing an iris region from the face image; performing first fusion processing on the iris local image and the beauty lens image to obtain a local beauty lens effect image; wherein the first fusion processing is used for integrating an image style of the beauty lens image into the iris local image and retaining texture features of the iris local image; performing second fusion processing on the local beauty lens effect image and the face image to obtain a beauty lens try-on image; wherein the second fusion processing is used for integrating the image style of the local beauty lens effect image into an eye region of the face image. It can be seen that, through the present scheme, a beauty lens try-on image with high simulation effect can be generated.

The present invention aims to provide an optical system of a laser processing apparatus in which the energy utilization efficiency of laser light is high, and the intensity distribution shape of the laser light at an irradiation point does not change even if the focal point position deviates due to thermal lens effect, and a laser processing apparatus using the optical system of the laser processing apparatus. To achieve this aim, the laser processing apparatus for processing a work by irradiating laser light according to the present invention has an optical system having optical surfaces in which a plurality of different focal points are provided on the same optical axis, and an irradiation point of the laser light on the work is at a different position from the focal points, and the intensity distribution of the laser light on a plane perpendicular to the optical axis at the irradiation point is annular at least with the optical axis as the center.

The application relates to the technical field of continuous laser optical film, in particular to a low-heat-effect laser film and a preparation method thereof. The method comprises the following steps: designing a film system according to laser wavelengths and optical performance and simulating and optimizing; precisely polishing a substrate, ultrasonic cleaning and activating; alternately preparing high and low refractive index functional layers and interface modification layers by physical vapor deposition and atomic layer deposition, setting the interface modification layers between the adjacent high and low refractive index functional layers, forming a periodic stacking structure; and annealing treatment under an inert atmosphere at 150-300 DEG C to obtain a finished product. The method has the advantages that: phonon bridging and interface passivation are realized through nano-Al2O3 interface modification, interface thermal resistance is significantly reduced, heat accumulation and thermal lens effect are inhibited, and the laser damage threshold is improved; the process is controllable, the film layer is dense and uniform, and the method is suitable for antireflection, high-reflection or light-splitting devices of high-power continuous laser systems.

The invention relates to the technical field of laser control, and discloses a multi-dimensional state linkage carbon dioxide laser output closed-loop control method and system, and the method comprises the steps: obtaining a target output parameter and the real-time attitude data of a light guide system; determining geometric transmission limitation parameters according to the attitude data, and calculating and predicting light beam characteristics in combination with a heat effect mapping relation; if the predicted light beam characteristics do not meet the safety threshold value, executing a first strategy, and on the premise of keeping the target monopulse energy constant, adjusting the combination of the peak power and the duty ratio of the laser driving signal so as to improve the light beam characteristics; and if the threshold value is met, executing a second strategy, and performing energy compensation on the laser driving signal according to the transmission loss. Through dynamic waveform reconstruction and linear compensation, the problem of transmission limitation caused by posture change of the light guide arm and a thermal lens effect is solved, and the accuracy of laser output energy and the safety of the system are ensured.

The invention relates to the technical field of solid lasers, in particular to a large-energy green laser. The laser comprises a first pumping source, a first pumping coupling device, a second pumping source, a second pumping coupling device, a resonance assembly, a first frequency doubling crystal, a second frequency doubling crystal, a Q-switching device, a first crystal and a second crystal. The resonant assembly is used for forming a laser resonant cavity and further comprises a compensation device. According to the large-energy green laser provided by the invention, the thermal lens effect of the laser crystal can be weakened through the double-pumping double-crystal, so that the fundamental frequency light can be better amplified. And the arranged compensation device can also improve the overall thermal management of the laser by compensating the thermal lens effect, and is beneficial to outputting stable and high-energy laser.

A lens configured for a charged particle beam apparatus is described. The lens includes a first electrode configured to be charged to a first potential and a liner tube coupled to the first electrode, the liner tube includes at least a first conductive portion; a ceramic portion upstream of the first conductive portion; and one or more coating layers disposed on the ceramic portion in electrical contact with the first conductive portion. The lens includes a second electrode configured to be charged to a second potential, the first potential and the second potential generating a lens effect between the first conductive portion and the second electrode; and a magnetic deflector having at least a first pair of scan coils provided outside of the liner tube.

A method for controlling a LiDAR system and a LiDAR system. The method includes directing a laminar flow of heated air over an opening window of the LiDAR system, a thermal lens effect formed due to a temperature difference between the heated air and an ambient temperature; determining one or more operational parameters of the LiDAR system or a vehicle thereof; and modifying, based on the operational parameter, a flow parameter of the laminar flow. The LiDAR system includes a window; a scanning unit and a detecting unit; a nozzle configured to direct a laminar flow of heated air over the window to induce the thermal lens effect; and a control unit configured to cause the nozzle to direct the laminar flow; determining one or more operational parameters of the LiDAR system or a vehicle equipped therewith; and modifying one or more flow parameters of the laminar flow.

The application discloses a solar spectrum frequency division combined heat and power system and an operation method, and relates to the technical field of renewable energy sources, and comprises the following steps: S001, a coupling analysis baseline between irradiation parameters, heat distribution and optical characteristics is established, real-time temperature data and beam wavefront information of a spectrum frequency divider under sunlight conditions are collected, and an estimated atlas of refractive index gradient distribution is generated based on a thermal refractive index variation law. Through thermal, optical and force coupling control, the application realizes accurate prediction, real-time identification and dynamic correction of thermal lens effect, establishes a closed-loop feedback mechanism, guarantees stable alignment of photoelectric and photothermal paths, effectively improves system energy efficiency and operation reliability, and overcomes the problems of deviation, energy efficiency reduction and component damage caused by thermal lens in the prior art.

To reduce glare due to external light during an image display state of a variable mirror-equipped display apparatus.The variable mirror-equipped display apparatus that is electrically switchable between a mirror state and an image display state including: a display unit that emits image light; a reflective polarizer disposed on a light emission side of the display unit; a liquid crystal lens disposed opposite the display unit with the reflective polarizer interposed therebetween; and a control device that controls operation of the display unit and the liquid crystal lens; where the liquid crystal lens is electrically switchable under the control of the control device between a first state which exhibits a lens effect and a second state which does not exhibit the lens effect.

The invention provides an InP optical communication laser chip reliability prediction and aging screening method, and relates to the technical field of semiconductor laser manufacturing and reliability evaluation. The method comprises the following steps: firstly, inducing a transient thermal lens effect through asymmetric bipolar current perturbation, eliminating charge interference by utilizing reverse bias, and capturing a dynamic resistance and wavelength chirp sequence reflecting lattice dislocation climbing; then constructing a physical failure mode database, stripping intrinsic thermal damping through a frequency domain, mapping degradation characteristics to an epitaxial stress relaxation and non-radiative composite mechanism, and realizing deep analysis of defect fingerprints; and finally, based on a physical embedded deep learning architecture, carrying out life prediction by taking a carrier rate equation and an entropy increase law as constraints, and evaluating a residual lattice structure margin by using a quadratic quotient of a prediction trajectory. According to the method, the problems that hidden defect identification is insufficient and prediction violates physical rules are solved, and high-precision performance grading and risk interception are realized.

The invention relates to a glass cleaning and drying device for laser cutting, and relates to the related technical field of glass cleaning and drying for laser cutting, the glass cleaning and drying device for laser cutting comprises a conveying platform, an operation frame, an operation frame, a lifting mechanism, a cleaning mechanism, a positioning mechanism, an air blowing mechanism, an air pipe mechanism and a liquid conveying mechanism. In the prior art, the process linkage is not smooth, the overall treatment efficiency is low, particularly, fixed-angle air blowing is mostly adopted after spraying, water flow diffusion is difficult to effectively guide, and more importantly, dissolved substances such as mineral substances in cleaning liquid can be left on the surface of glass along with water evaporation to form irregular water stain traces, so that the cleaning effect is poor. And the residues can generate a lens effect and thermal stress under laser irradiation, so that the cutting uniformity and the yield are seriously influenced.

This invention discloses a method for correcting the water diffuse attenuation coefficient based on the water surface lensing effect of hyperspectral resolution lidar. It constructs a water surface lensing effect model to characterize the focusing phenomenon of pulse energy, uses ECKV wave spectrum to simulate the dynamic water surface, and tracks the laser pulse penetrating the water body based on the law of light refraction. The degree of pulse energy focusing is statistically analyzed using a two-dimensional histogram. Based on the unique molecular and particle separation characteristics of hyperspectral resolution lidar, the method corrects the overestimated water diffuse attenuation coefficient in shallow water areas due to the water surface lensing effect. This invention provides a new solution for correcting the water diffuse attenuation coefficient in shallow sea areas, contributing to improved water quality monitoring accuracy in shallow water regions.

This invention discloses a laser frequency conversion system and method based on thermal lensing effect enhancement, belonging to the field of laser technology. The system includes a first pump source, a nonlinear frequency conversion crystal, and a second pump source. The crystal is a rare-earth-doped calcium borate crystal, which absorbs the first pump light to generate a controllable thermal lensing effect. The fundamental wave light emitted from the second pump source is coaxially incident on the crystal with the first pump light. The thermal lens focuses the fundamental wave light, significantly increasing its power density within the crystal. The crystal then utilizes a nonlinear optical effect to efficiently convert the high-power-density fundamental wave light into harmonic light output. This invention solves the problem of low efficiency in traditional extracavity frequency doubling. Through an active focusing mechanism, high-efficiency and high-stability visible light laser output can be achieved with only a lower fundamental wave power, making it particularly suitable for biological detection and medical aesthetics.

To provide a Tb-containing rare earth-aluminum garnet ceramic which has a Verdet constant similar to that of a TGG single crystal used in an isolator, has an insertion loss and extinction ratio equal to or greater than those of a TGG single crystal, generates less heat when a high-power laser is applied thereto, and is unlikely to cause a thermal lens effect or thermal birefringence. The present invention relates to: a Tb-containing rare earth-aluminum garnet ceramic including a garnet polycrystal represented by the compositional formula (TbxRe1-x)3(AlySc1-y)5O12 wherein Re is at least one element selected from a group consisting of Y and Lu, x=1.0-0.5, and y=1.0-0.6, and including Si and at least one element selected from a group consisting of Ca and Mg; a method for producing same; and an isolator device obtained using the ceramic.

The invention provides a high-power laser chip with dual thermal drift suppression and a preparation process thereof, and relates to the technical field of laser chips, the chip is characterized in that negative Poisson's ratio strain inversion structures connected by turn-back micro beams are symmetrically arranged on two sides below a P-type ohmic contact layer, and a thermal expansion driven physical compensation mechanism is utilized, so that the high-power laser chip with dual thermal drift suppression is obtained; a gradient photonic crystal heat flow guide layer is embedded between the active area and an ohmic contact layer, longitudinal expansion generated by heating is converted into transverse tensile strain to the active area, so that an energy band is widened, band gap reduction caused by temperature rise is offset, and lasing output close to zero red shift is achieved. Directional deflection of heat flow to side wings of the chip is realized through spatial gradient distribution of nano hole density, a thermal lens effect is eliminated in cooperation with a high-heat-conductivity channel of the side wings, and the problem that light beam quality is deteriorated due to serious wavelength drift and heat accumulation when a traditional laser chip continuously works at high power is solved. And the output power upper limit and the stability are obviously improved.

The invention discloses a concave surface total reflection position optimization method for a bicrystal regeneration amplification structure. The to-be-optimized bicrystal regeneration amplification structure comprises an optical resonant cavity, two gain crystals arranged in series, two concave total reflective mirrors and a Pockels cell. The method comprises the following steps: determining the positions of two gain crystals in a bicrystal regeneration amplification structure in an optical resonant cavity, and setting the initial positions of two concave total reflective mirrors according to the physical cavity length of the optical resonant cavity; establishing a thermal lens effect model of the gain crystal, obtaining thermal lens focal lengths of the gain crystal under different pumping powers, and carrying out substitution optimization on initial positions of the two concave total reflective mirrors; and verifying the optimized position of the concave total reflective mirror, detecting the stability of the optical resonant cavity and the beam quality of the output laser in a set pumping power range, and if the stability and the beam quality meet preset requirements, determining the optimized position of the concave total reflective mirror as a final position.

The invention relates to a pump enhanced optical parametric oscillator based on a monolithic cavity PPLN crystal, a vortex light generation method and application. The pump enhanced optical parametric oscillator comprises a pump laser, a matching lens, a half-wave plate, a polarization beam splitter, a quarter-wave plate, a radial polarization converter, the PPLN crystal, a temperature control furnace, a multi-dimensional adjusting frame and a spectroscope. The two end faces of the PPLN crystal are spherical surfaces, the end faces are coated with film layers, and the PPLN crystal serves as an optical parametric oscillation cavity, so that a complex cavity mirror system is omitted; the end face of the PPLN crystal is coated with a film, so that the effect of pumping enhancement is achieved, the threshold value is reduced, the conversion efficiency is improved, meanwhile, the wavelength tuning characteristic is considered, the thermal self-locking effect and the thermal lens effect are utilized, long-time wavelength stability and power stability are achieved, and a complex stable cavity system is omitted; when pump light is converted into vortex light through the S wave plate, orbital angular momentum can be selectively transmitted to idler frequency light or signal light, intermediate infrared or near-infrared vortex light output is achieved, and a miniaturized and portable vortex light generator and multi-field application can be achieved.

The invention discloses a millimeter-scale pipe flow pattern identification and void ratio measurement method based on semantic segmentation. The method comprises the following steps: acquiring an original image sequence of pipeline gas-liquid two-phase flow and generating a standardized flow image; a convolutional neural network based on a double-domain spatial spectrum attention mechanism is constructed, and gas-liquid interface high-precision segmentation is realized through feature adaptive calibration of channels and spatial dimensions; a double-flow heterogeneous feature extraction framework is constructed, explicit physical geometric features and implicit high-dimensional semantic features are fused, orthogonal fusion is carried out through a self-attention dynamic mechanism, and high-robustness flow pattern recognition is achieved; and establishing a pipeline optical distortion compensation model, constructing a radial optical path transmission function for a lens effect, performing radial physical correction on a two-dimensional contour, reconstructing a bubble volume based on an axisymmetric slice integral method, and calculating a void ratio. The invention constructs a non-contact measurement method for gas-liquid two-phase flow of a millimeter-level pipeline by fusing semantic segmentation, physical feature modeling and an optical compensation mechanism.

The application relates to the technical field of laser amplification. A laser amplification system comprises a gain module and a mirror reflection module. The gain module has a first reflection surface and a gain medium which are stacked. The first reflection surface is used for reflecting laser light. The first reflection surface is recessed from the gain medium towards the first reflection surface. Laser light is incident into the first reflection surface from the gain medium towards the first reflection surface. The mirror reflection module is located on the reflection side of the gain module and comprises a plane mirror and a folded mirror. The folded mirror is located between the gain module and the plane mirror. The folded mirror comprises a second reflection surface and a third reflection surface which are perpendicular to each other and face the plane mirror. The second reflection surface and the third reflection surface are used for making the laser light incident into the folded mirror and the laser light emitted from the folded mirror parallel. The laser amplification system satisfies the above structure, realizes folding of the optical path of laser light, and can compensate for thermal lens effect in the laser amplification system.

The present application relates to a kind of high beam quality laser of adjustable repetition frequency, comprising: seed source, output 20-100MHz repetition frequency picosecond signal laser;Pulse selector is connected seed source and is configured as: response to target repetition frequency value set by user, when repetition frequency>50kHz, carry out normal pulse selection, when repetition frequency≤50kHz, enable Burst Mode editing function, generate the pulse train envelope containing 2-10 sub-pulses;Three-stage laser amplifier in series, pulse is amplified, each stage contains pump source, focusing lens and laser crystal;Thermal lens cooperative control unit is used to improve the thermal lens effect of laser crystal, including: pump spot adjusting module, response the target repetition frequency value, automatically adjust the distance of each stage focusing lens to laser crystal and pump current;Pulse energy editing module, under Burst Mode, dynamically modulate the sub-pulse energy in pulse train and make it show increasing distribution;Uniform temperature field module, including the TEC array and temperature sensor array arranged around laser crystal, according to target repetition frequency value, automatically match laser crystal temperature field set value and maintain laser crystal temperature field uniform, the high beam quality laser of adjustable repetition frequency provided by the present application supports adjustable repetition frequency, and after repetition frequency is adjusted in a large range, thermal lens effect in laser crystal, thermal equilibrium is stable, laser can stably output excellent beam quality laser beam.

To provide a glass material and a magnetic optical element with a reduced thermal lens effect. A glass material contains, in mol %, from 10% to 90% of Tb2O3, from 1% to 89% of B2O3+Al2O3+SiO2+P2O5, and from 0.01 ppm to 100 ppm of FeO+Fe2O3, and further contains, as an external proportion, from 0.001% to 1% of CeO2.

A multiple particle beam system comprises: a magnetic lens through which a plurality of individual charged particle beams pass; and a controller configured to control, such as dynamically control, the magnetic lens. The magnetic lens comprises a coil, a winding body and a pole shoe. The coil is arranged around the winding body and the winding body is a hollow body through which the plurality of individual particle beams pass. The coil, together with the winding body, is arranged within the pole shoe. The pole shoe has an opening through which a magnetic field created by the magnetic lens emerges from the pole shoe and interacts with the plurality of individual particle beams to obtain a lens effect. The winding body is electrically conductive and has an interruption, by which the electrical conductivity of the winding body is interrupted in the circumferential direction around the particle-optical axis.

The application discloses a multi-step ridge type laser structure and a preparation method thereof, and relates to the technical field of gallium nitride semiconductor lasers. The multi-step ridge type laser structure comprises, in order from bottom to top, an N-type electrode layer, a substrate layer, a buffer layer, a first limiting layer, a first waveguide layer, an active layer, a second waveguide layer, an electron blocking layer, a second limiting layer, a P-type GaN layer, a P-type ohmic contact layer and a P-type electrode layer. The widths of the second waveguide layer, the electron blocking layer, the second limiting layer, the P-type GaN layer and the P-type ohmic contact layer are gradually reduced and a multi-step ridge structure is formed. The multi-step ridge type laser structure can not only significantly suppress the lateral high-order mode of the laser, optimize the carrier distribution, but also improve the reliability and the service life of the laser. Furthermore, the multi-step ridge type laser structure can reduce the influence of factors including thermal lens effect and lateral current spreading effect, suppress the lateral high-order mode of the laser and improve the output performance of the laser.