45 results about "Thermal lensing" patented technology

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.

This invention discloses a YAG-based composite laser ceramic and its preparation method. The composite laser ceramic has a five-layer structure from top to bottom: a microstructured concave YAG transparent ceramic, an Nd:YAG transparent ceramic, a YAG transparent ceramic I, a Ce,Nd:YAG transparent ceramic, and a YAG transparent ceramic II. The microstructured concave YAG transparent ceramic is used to reduce the temperature gradient and compensate for the thermal lensing effect; the Nd:YAG transparent ceramic is used to collect the energy emitted by the microstructured concave YAG transparent ceramic and to transfer the energy; the Ce,Nd:YAG transparent ceramic is used for laser energy transfer; and the YAG transparent ceramic I and YAG transparent ceramic II are used to reduce the ceramic thermal lensing effect. It is prepared using thermal bonding technology. The composite laser ceramic of this invention emits bright yellow light near 1064 nm when excited by a laser with a pump source of 808 nm. Furthermore, the composite laser ceramic has a light-to-light conversion efficiency of 19.85% and a laser threshold of 410 mW.

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 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 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.

This invention provides a reliability prediction and aging screening method for InP optical communication laser chips, relating to the field of semiconductor laser manufacturing and reliability assessment technology. The method first induces a transient thermal lensing effect through asymmetric bipolar current perturbation, then uses reverse bias to clear charge interference, capturing the dynamic resistance and wavelength chirp sequence reflecting lattice dislocation climb. Subsequently, a physical failure mode database is constructed, and intrinsic thermal damping is stripped in the frequency domain, mapping degradation features to epitaxial stress relaxation and nonradiative recombination mechanisms to achieve in-depth defect fingerprint analysis. Finally, based on a physically embedded deep learning architecture, the carrier rate equation and entropy increase law are used as constraints for lifetime prediction, and the second derivative of the predicted trajectory is used to evaluate the remaining lattice structure margin. This invention solves the problems of insufficient latent defect identification and predictions violating physical laws, achieving high-precision performance grading and risk interception.

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.

The invention provides a finite element numerical simulation method based on photo-thermal lens spectrum insulating oil furfural detection, and relates to the field of numerical analysis of an insulating oil detection technology. The method comprises the following steps: constructing a geometric model comprising insulating oil containing trace furfural, an optical window and a detection plane to obtain a pump beam and a probe beam; the refractive index in the pump beam propagation process is solved; presetting extinction coefficients corresponding to the furfural with different concentrations, and obtaining photothermal effect data of the multi-concentration furfural; calculating the temperature distribution after the insulating oil absorbs energy, and describing the change relation of the refractive index along with the temperature through a thermo-optical coefficient; insulating oil temperature distribution and pump beam propagation characteristics in a steady state are obtained; solving the thermal stress of the insulating oil to the optical window sheet under the excitation of the pumping light beam; non-isothermal flowing and fluid-solid coupling behaviors of the insulating oil under the thermal lens effect are simulated, and fluid solving is carried out; the influence of the thermal lens effect on probe beam propagation is solved; and light spot distribution of the detection probe light beam is obtained.

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.

This invention discloses a holmium ion-doped yttrium gadolinium oxide single-crystal optical fiber, its preparation method, and its applications, belonging to the field of laser materials and laser technology. The chemical formula of the single-crystal optical fiber is Ho. 3+ YGdO3, wherein the Ho ion doping concentration is 0.2-1.0 at.%, is a cubic C-type sesquioxide crystal structure with space group Ia-3. This crystal exhibits characteristic absorption peaks at wavelengths of 1100-1200 nm and Ho-derived absorption peaks at 2.80-2.90 μm. 3+ ion 5 I6→ 5 Broad-spectrum mid-infrared fluorescence emission with I7 level transition; this crystal possesses a wide gain bandwidth, a large emission cross section, and excellent thermal properties, making it less prone to thermal lensing and thermal depolarization under continuous or high-repetition-rate pumping of single-crystal fibers, thus ensuring high stability of laser output. It is particularly suitable for realizing broadband tunable and ultrafast mode-locked mid-infrared lasers, and has broad application prospects in laser surgery, environmental monitoring, remote sensing, and other fields.

A method of altering a refractive property of a crosslinked acrylic polymer material by irradiating the material with a high energy pulsed laser beam to change its refractive index. The method is used to alter the refractive property, and hence the optical power, of an implantable intraocular lens after implantation in the patient's eye. In some examples, the wavelength of the laser beam is in the far red and near IR range and the light is absorbed by the crosslinked acrylic polymer via two-photon absorption at high laser pulse energy. The method also includes designing laser beam scan patterns that compensate for effects of multiphone absorption such as a shift in the depth of the laser pulse absorption location, and compensate for effects caused by high laser pulse energy such as thermal lensing. The method can be used to form a Fresnel lens in the optical zone.

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.

This invention proposes a gallium nitride-based semiconductor laser, comprising, from bottom to top, a substrate, a lower confinement layer, a lower waveguide layer, an active layer, an upper waveguide layer, and an upper confinement layer. This invention incorporates a multi-layered, multi-vacancy electron-phonon modulation layer within the semiconductor laser element, defining the electron affinity distribution and polarization optical phonon energy distribution characteristics of each multi-vacancy electron-phonon modulation layer. This forms single-vacancy, vacancy cluster, and multi-vacancy modulated electron-phonon structures, localizing electron-phonons between the lower confinement layer and the lower waveguide layer. This reduces the Stokes shift caused by the photon energy difference between the pump light and the oscillating light, reduces heat loss from phonon vibration and phonon transport, improves the heat dissipation of the laser element, mitigates interlayer thermal mismatch, suppresses the thermal lensing effect and stress birefringence effect of the laser, improves laser beam distortion and depolarization, and enhances the laser beam quality factor.

A high-power laser system includes at least one high-power laser source outputting a substantially single mode (SM) beam. The SM beam is coupled into a reflective volume Bragg grating (RVBG) made of material which absorbs the SM beam to induce a first thermal lens (TL). Upon reflecting, the beam exits the RVBG through the first TL and is coupled into an optical compensator made from material different from that of the first TL and inducing a second TL. The second TL is configured to have a power opposite to that of the first TL matching to that of the first TL to at least partially compensate heat induced thermal degradation of the reflected beam by the first TL.

Exemplary thermoelectric devices and methods are disclosed herein. Thermoelectric generator performance is increased by the shaping isothermal fields within the bulk of a thermoelectric pellet, resulting in an increase in power output of a thermoelectric generator module. In one embodiment, a thermoelectric device includes a pellet comprising a semiconductor material, a first metal layer surrounding a first portion of the pellet, and a second metal layer surrounding a second portion of the pellet. The first and second metal layers are configured proximate to one another about a perimeter of the pellet. The pellet is exposed at the perimeter. And the perimeter is configured at a sidewall height about the pellet to provide a non-linear effect on a power output of the thermoelectric device by modifying an isotherm surface curvature within the pellet. The device also includes a metal container thermally and electrically bonded to the pellet.

This invention discloses a laser welding device with a laser welding head cooling mechanism, comprising: a laser welding head, with a housing on each of the left and right sides; copper tubes, which are respectively inserted through and fixed to the front of the inner walls of the two housings, with several water outlets on the back of the copper tubes; several water pipes, which are respectively fixed to the back of the water outlets of the two sets of copper tubes; a cold water plate, which is fixedly installed on the inner walls of the two housings; a cooling assembly, which is disposed on the front of the cold water plate; a U-shaped plate, which is fixed to the back of the cold water plate; and two guide rods, which are fixed to the bottom and top of the U-shaped plate. This invention uses a tank shell to evenly blow gas to the back of the laser welding head, thereby avoiding the problem of heat accumulation in a localized area of ​​the laser welding head, which causes thermal lensing effect and beam quality degradation.

The invention provides a multi-path polarization beam splitting and combining optical isolator, which comprises a polarization beam splitting device, an isolation processing device and a polarization beam combining device which are sequentially arranged along an optical path, and is characterized in that the polarization beam splitting device is used for splitting an incident beam into N paths of sub-beams which are propagated in parallel, and N is an integer greater than or equal to 4; the isolation processing device comprises at least one Faraday rotator and at least one isolation half-wave plate which are sequentially arranged along a light path, and the N sub-beams simultaneously pass through the Faraday rotator and the isolation half-wave plate in a spatial parallel mode; and the polarization beam combining device is used for combining the N sub-beams processed by the isolation processing device into one emergent beam. By means of the structure of beam splitting, parallel processing and beam combining, energy of a single high-power laser beam is dispersed into N parallel light paths to be processed, so that local optical power density passing through a Faraday rotator is greatly reduced from the physical principle, and the problem of thermal management under high power is effectively solved by restraining the thermal lens effect.

The invention provides an adjustable optical compensation method and device for a laser resonant cavity. The method comprises the following steps: acquiring working condition parameters of operation of a target laser and current thermal state data of a gain crystal; determining first thermal lens focal power under the current working condition based on the working condition parameters in combination with a preset parameter focal power mapping table, and determining second thermal lens focal power under the current working condition based on the current thermal state data in combination with a preset thermal-optical conversion mapping table; performing deviation correction based on the first thermal lens focal power and the second thermal lens focal power to obtain corrected target thermal lens focal power; and determining a target compensation lens based on the target thermal lens focal power and the fixed focal power of the concave end surface of the gain crystal in the resonant cavity in combination with a preset stable margin condition and the compensation lens focal power corresponding to a plurality of preset compensation lenses. The requirement for frequent switching of working condition parameters is met, and the technical effects that the laser output power is stable, the light beam quality is good, and switching is efficient and reliable are achieved.

The invention discloses a traveling wave amplification device and method based on thermal lens imaging, and the device comprises a laser seed source which is used for outputting seed laser with initial power and frequency; the traveling wave amplification systems are connected in series on an output light path of the seed laser in a multi-stage manner, each stage of traveling wave amplification system comprises a laser isolation module, a plano-convex lens, a laser crystal, a plano-concave dichroic mirror and a pumping source module, the laser crystal forms an equivalent thermal lens under the action of pumping light of the pumping source module, and in each stage of traveling wave amplification system, the plano-concave dichroic mirror forms an equivalent thermal lens; based on light path reflection of the plano-concave dichroic mirror, the seed laser realizes two-way amplification in the laser crystal, and the radiuses of laser modes passing through the laser crystal back and forth tend to be consistent based on thermal lens imaging; the dual-pass single-grating compression system is used for pulse time domain compression, and the thermal lens imaging principle is introduced, so that the problems of beam distortion and stability degradation in the traveling wave amplification process can be effectively inhibited while high-efficiency laser amplification is met.

The application provides a water lens heater for warming and heat preservation of a mariculture pond and a use method, and relates to the technical field of seawater heating. The heater comprises a water lens unit and at least one heat preservation unit, the water lens unit and the heat preservation unit form a stacked structure distributed in an up-down mode, the water lens unit is located below the heater, and the heat preservation unit is stacked above the water lens unit; a water injection cavity for water injection is formed in the water lens unit, and an air cavity for air injection is formed in the heat preservation unit; the water lens unit and the heat preservation unit are both made of a light-transmitting film. The heater can effectively shorten the warming period of the mariculture pond through the synergistic effect of the three mechanisms of heat locking through the greenhouse effect, light concentration and efficiency increase through the lens, and multi-layer air heat insulation, can raise low-temperature seawater to a suitable temperature for breeding in several hours or 1-2 days, and greatly improves fattening efficiency and production rhythm.

The invention is applicable to the field of additive manufacturing, and provides a multi-laser intelligent thermal management and wavelength stabilization system for forging and printing equipment, which comprises a central thermal management unit, a graded temperature control cooling loop, a thermally induced deformation real-time compensation system and a wavelength locking and monitoring system, the central heat management unit is electrically connected with all the systems and communicates with a forging and printing equipment upper computer. The graded temperature control cooling loop comprises a first-stage water cooling machine and a second-stage precise temperature control module which are connected in series, so that + / -0.1 DEG C precise temperature control is realized; the thermally induced deformation real-time compensation system monitors light beam parameters through a spectroscope and a light beam quality analyzer, and compensates a thermal lens effect in cooperation with a beam expander; the wavelength locking and monitoring system monitors the wavelength by using a spectroscope and a micro spectrometer, and realizes the stability of the wavelength within + / -0.5 nm in combination with secondary temperature control; the problems of multi-laser thermal runaway, light beam quality degradation and wavelength drift are solved, the forging printing precision is improved, the service life of equipment is prolonged, and the method is suitable for machining of metal components such as titanium alloy and copper materials.

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.

Exemplary thermoelectric devices and methods are disclosed herein. Thermoelectric generator performance is increased by the shaping isothermal fields within the bulk of a thermoelectric pellet, resulting in an increase in power output of a thermoelectric generator module. In one embodiment, a thermoelectric device includes a pellet comprising a semiconductor material, a first metal layer surrounding a first portion of the pellet, and a second metal layer surrounding a second portion of the pellet. The first and second metal layers are configured proximate to one another about a perimeter of the pellet. The pellet is exposed at the perimeter. And the perimeter is configured at a sidewall height about the pellet to provide a non-linear effect on a power output of the thermoelectric device by modifying an isotherm surface curvature within the pellet. The device also includes a metal container thermally and electrically bonded to the pellet.

This invention discloses a dynamic thermal lens compensation method based on an unstable resonant cavity, comprising: (1) deriving the abcd matrix of light traveling one round trip in the cold cavity according to a repetition frequency of 1 Hz, and calculating its geometric magnification; (2) measuring the focal length of the thermal lens at different repetition frequencies; (3) fixing the distances from the output mirror and the original total reflection mirror in the resonant cavity to the end face of the crystal, and replacing the original total reflection mirror with a planar total reflection mirror; (4) deriving the ABCD matrix of light traveling one round trip in the compensation cavity according to the focal length of the thermal lens corresponding to different repetition frequencies, and calculating its geometric magnification; (5) setting the distance between the planar total reflection mirror and the left end face of the crystal as a variable, making the geometric magnification of the compensation cavity equal to that of the cold cavity, and calculating the corresponding distance between the planar total reflection mirror and the left end face of the crystal; (6) constructing the final compensation unstable cavity according to the distance between the planar total reflection mirror and the left end face of the crystal, thus completing the thermal lens compensation. This invention achieves dynamic compensation of the focal length of the thermal lens corresponding to different repetition frequencies using simple operations.

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 application belongs to the technical field of laser, and discloses a steady-state simulation method, equipment and storage medium of a solid laser. A pump source model is constructed to calculate pump light intensity and photon flux; a crystal heat source distribution is solved based on the pump light intensity, a three-dimensional temperature field and a thermal lens focal length are obtained by using a step-by-step Fourier solving method; the stability is analyzed by dynamically updating the equivalent g parameter and the curvature radius of the resonant cavity by using the thermal lens focal length; the pump absorption and gain distribution are calculated in combination with the pump light intensity, the photon flux and the crystal boundary reflection characteristics; the pump-laser mode overlap factor is calculated based on the beam parameter calculated according to the equivalent g parameter, the pump light intensity and the laser light intensity; the laser threshold power is calculated, and the output power is calculated in combination with the threshold power and the input pump power; the steady-state laser field is iteratively solved based on the equivalent g parameter, the thermal lens focal length and the gain distribution, and finally the simulation result is output, the dynamic coupling feedback of the thermal lens focal length and the resonant cavity parameter is realized, and the simulation precision is significantly improved.