Optomechanical-thermal coupling analysis method for lasers under vibration and temperature disturbance conditions

Abstract

This invention belongs to the field of laser technology. It proposes a method for optomechanical-thermal coupling analysis of lasers under vibration and temperature disturbance conditions. The method involves establishing a three-dimensional structural model of the laser based on its design parameters; establishing a laser optical performance calculation model based on these parameters; establishing a finite element model for dynamic and thermodynamic analysis based on the three-dimensional structural model; applying vibration and temperature change boundary conditions to the finite element model and solving the model to obtain coordinate displacement data for the mirror and related optical components; separating and processing the rigid body displacement and surface deformation of the coordinate displacement data; converting the processed data into a phase modulation matrix acceptable to the laser optical performance calculation model; and importing the phase modulation matrix into the laser optical performance calculation model for optical propagation and cavity mode performance simulation evaluation. This invention achieves end-to-end prediction from structural deformation to laser optical performance degradation.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and more specifically to a method for optical-mechanical-thermal coupling analysis of lasers under vibration and temperature disturbance conditions. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] With the widespread application of laser technology in industrial manufacturing, precision measurement, space exploration, medical treatment, and communications, lasers often operate in environments with complex external disturbances such as mechanical vibration, shock, and temperature gradients. Structural stress and temperature changes can cause rigid displacement and surface deformation of optical components, thereby altering the stability of the laser resonator cavity and leading to cavity mode mismatch, decreased beam quality (M²), mode distortion, and output power attenuation. These effects are particularly significant in high-power, high-coherence, or high-stability systems, and may even cause laser output interruption or damage to optical components.

[0004] Existing analytical methods each have their own focus but also significant limitations: ray tracing methods based on geometric optics are mostly suitable for evaluating the imaging quality of imaging systems and beam transmission systems, but they cannot accurately characterize beam diffraction, wave propagation, and mode competition within the laser resonator. Wave optics methods that can describe the wave characteristics and mode evolution within the cavity typically lack a unified and practical processing flow to map structural deformation or thermal stress deformation to beam transmission within the laser resonator. Overall, optical, structural, and thermal models often exist independently, lacking a clear numerical mapping step from finite element displacement to wave optical phase, making it difficult to achieve a complete evaluation of the entire chain from structural deformation to laser optical performance degradation within a single computational framework. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a laser optomechanical-thermal coupling analysis method under vibration and temperature disturbance conditions. This method can effectively combine optical, structural, and thermal models within the same computational framework, enabling end-to-end prediction from structural deformation to laser optical performance degradation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for optical-mechanical-thermal coupling analysis of lasers under vibration and temperature disturbance conditions.

[0008] A method for optomechanical-thermal coupling analysis of lasers under vibration and temperature disturbance conditions includes the following steps:

[0009] Establish a three-dimensional structural model of the laser based on the laser design parameters;

[0010] Establish a laser optical performance calculation model based on laser design parameters;

[0011] A finite element model for dynamic and thermodynamic analysis was established based on the three-dimensional structural model of the laser.

[0012] Vibration and temperature change boundary conditions are applied to the finite element model and solved to obtain the coordinate displacement data of the mirror and related optical components;

[0013] The coordinate displacement data is separated and processed to separate rigid body displacement and surface deformation, and the processed data is converted into a phase modulation matrix acceptable to the laser optical performance calculation model.

[0014] The phase modulation matrix is ​​imported into the laser optical performance calculation model to perform optical propagation and cavity mode performance simulation evaluation.

[0015] Secondly, the present invention provides a laser optomechanical-thermal coupling analysis system for use under vibration and temperature disturbance conditions.

[0016] A laser optomechanical-thermal coupling analysis system for use under vibration and temperature disturbance conditions includes the following processes:

[0017] The structural model building unit is configured to: build a three-dimensional structural model of the laser based on the laser design parameters;

[0018] The optical model building unit is configured to: establish a laser optical performance calculation model based on laser design parameters;

[0019] The finite element model building unit is configured to: establish a finite element model for dynamic and thermodynamic analysis based on the three-dimensional structure model of the laser;

[0020] The boundary condition application element is configured to apply vibration and temperature change boundary conditions to the finite element model and solve them to obtain the coordinate displacement data of the mirror and related optical elements.

[0021] The phase modulation generation unit is configured to separate and process the rigid body displacement and surface deformation of the coordinate displacement data, and convert the processed data into a phase modulation matrix acceptable to the laser optical performance calculation model.

[0022] The optical performance simulation unit is configured to import the phase modulation matrix into the laser optical performance calculation model and perform optical propagation and cavity mode performance simulation evaluation.

[0023] Thirdly, the present invention provides a computer device, comprising: a processor and a computer-readable storage medium;

[0024] A processor, adapted to execute computer programs;

[0025] A computer-readable storage medium storing a computer program, which, when executed by a processor, implements the first aspect of the present invention: a laser optomechanical-thermal coupling analysis method under vibration and temperature disturbance conditions.

[0026] Fourthly, the present invention provides a computer-readable storage medium storing a computer program adapted to be loaded by a processor and executed by a method for laser optomechanical-thermal coupling analysis under vibration and temperature disturbance conditions according to the first aspect of the present invention.

[0027] Fifthly, the present invention provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the laser optomechanical-thermal coupling analysis method under vibration and temperature disturbance conditions according to the first aspect of the present invention.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] This invention innovatively proposes a laser optomechanical-thermal coupling analysis method for vibration and temperature disturbance conditions, establishes a data channel from finite element method to optical simulation, realizes automatic processing of rigid body decomposition and Zernike resampling, and improves simulation efficiency and repeatability.

[0030] For wave optics and laser cavity mode analysis, this invention innovatively proposes a coupled simulation method that accurately maps the surface error and rigid body displacement output by the finite element model to the optical complex amplitude field. Combining the angular spectrum method and the Fox-Li iteration method, it accurately describes the diffraction effect and the evolution of intracavity eigenmodes, and directly outputs key performance parameters such as M² factor, diffraction loss, and output power.

[0031] This invention innovatively proposes a method to support closed-loop iterative coupling of light, heat, and machinery. It can back-calculate the light field distribution obtained in optical simulation into thermal load and feed it back to the finite element model, realizing self-consistent light-heat-machine coupling analysis and improving the prediction accuracy in high-power scenarios.

[0032] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0033] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0034] Figure 1A flowchart illustrating a laser optomechanical-thermal coupling analysis method under vibration and temperature disturbance conditions, provided as an exemplary embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of a three-dimensional structure model of a laser provided for an exemplary embodiment of the present invention, wherein 1 represents a reflector and a frame, 2 represents an output mirror and a frame, 3 represents a side pump module, 4 represents a laser housing, and 5 represents a fixing bracket.

[0036] Figure 3 A displacement cloud diagram of a laser under random vibration is provided as an exemplary embodiment of the present invention;

[0037] Figure 4 Displacement cloud map of a lens provided as an exemplary embodiment of the present invention;

[0038] Figure 5 A diagram showing the variation of beam quality and output power at different deflection angles is provided as an exemplary embodiment of the present invention, wherein... Figure 5 (A) in the diagram is a schematic diagram showing the relationship between beam quality and deflection angle. Figure 5 (B) in the diagram is a schematic diagram showing the relationship between output power and deflection angle;

[0039] Figure 6 A distribution diagram of the optical field under random vibration is provided as an exemplary embodiment of the present invention, wherein, represent The beam quality in the direction is 13.63. represent The beam quality in the direction is 2.67;

[0040] Figure 7 A schematic diagram of a laser optomechanical-thermal coupling analysis system under vibration and temperature disturbance conditions, provided as an exemplary embodiment of the present invention;

[0041] Figure 8 A schematic diagram of a computer device provided for an exemplary embodiment of the present invention. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0044] This implementation proposes a method for optomechanical-thermal coupling analysis of lasers under vibration and temperature disturbance conditions, such as... Figure 1As shown, based on the laser design parameters, on the one hand, it provides basic optical parameter support for the optical performance calculation model, and on the other hand, it supports the construction of the laser's three-dimensional model. The three-dimensional model further provides structural basis for the establishment of the structural and thermodynamic finite element analysis model. The finite element model solves the mirror displacement coordinates by applying boundary conditions. Then, the mirror displacement coordinates are separated into rigid body displacement and surface deformation. The processed data is imported into the optical performance calculation model for simulation analysis. At the same time, the optical performance calculation model will feed back relevant data to the finite element analysis model, forming a complete optical-mechanical-thermal collaborative analysis closed loop.

[0045] More specifically, it includes the following processes:

[0046] S101: Based on the laser design parameters (geometry, material, mirror curvature / diameter, cavity length, absorption distribution, pump layout, etc.), create a 3D structural model in CAD modeling software and export it as a STEP / STL format. For example... Figure 2 As shown, the laser structure used in this example includes a reflector and frame 1, an output mirror and frame 2, and two side pump modules 3, all of which are fixed inside the laser housing 4. The entire laser unit is fixed by a mounting bracket 5.

[0047] S102: Establish a laser optical performance calculation model based on the laser design parameters, determining wavelength λ, cavity shape, incident near-field distribution E(x,y), optical element positions and curvature, aperture function A(x,y), etc. The laser optical performance calculation model includes the following functions:

[0048] S102-1: Wave optical propagation based on angular spectrum method (used to calculate the process of laser propagation from one lens to another, such as how light diffuses and how the phase changes).

[0049] For planar near-field complex amplitude Its spectral propagation relationship at a propagation distance z is as follows:

[0050] (1);

[0051] in, Represents the distance of transmission The angular spectrum of the light field at that location; represent Spatial frequency components of the direction; represent Spatial frequency components in the direction, The angular spectrum representing the initial planar (near-field) light field, i.e., the complex amplitude of the planar near-field light field. The result of the two-dimensional Fourier transform.

[0052] Angular spectral transfer function for:

[0053] (2);

[0054] in, Represents the wavelength of the laser; It represents the imaginary unit.

[0055] In practice, numerical implementations typically use two-dimensional FFT / IFFT:

[0056] (3);

[0057] in, The spatial domain complex amplitude represents the propagation distance z; Represents the two-dimensional inverse Fourier transform; Represents a two-dimensional Fourier transform; The spatial domain complex amplitude represents the initial plane near field.

[0058] S102-2: Laser resonator mode self-reproduction based on Fox–Li iterative method (finding the “stable mode” of the laser in the resonator, which is equivalent to the state in which the laser can be stably output after reflecting back and forth in the cavity).

[0059] In a resonant cavity containing perturbations, the cavity modes are obtained through iterative propagation:

[0060] (4);

[0061] in, This represents a single propagation around the cavity (including angular spectrum propagation and mirror phase / reflection / transmission factor, etc.). Indicates endoscope / aperture truncation and gain processing, iterating to... The eigenmodes have converged; numerical implementation is underway. The phase factor and gain distribution given below can be embedded; Representing the The complex amplitude of the cavity mode spatial domain in the next iteration; Representing the Complex amplitude in the cavity mode spatial domain of the next iteration This represents the number of iterations.

[0062] S102-3: Phase term caused by thermal lensing.

[0063] Local temperature changes Causes a change in refractive index:

[0064] (5);

[0065] in, Represents the change in refractive index of an optical element; The differential change in refractive index; The differential change in temperature; Represents the temperature coefficient of refractive index; Representing the cross-section of an optical element Direction coordinates; Representing the cross-section of an optical element Direction coordinates.

[0066] Corresponding transmission phase (approximately uniform thickness) )for:

[0067] (6);

[0068] This is added to the lens phase factor to simulate the thermal lensing effect.

[0069] S102-4: Gain Saturation Model.

[0070] When the gain medium inside the cavity exhibits a saturation effect, the corresponding amplitude gain can be expressed as:

[0071] (7);

[0072] in, For local intensity, For small signal gain distribution, Saturation strength; It represents the local complex amplitude; this gain factor acts as an amplitude multiplier on the field in each propagation or amplification segment within the cavity.

[0073] S103: Import the structural model into the finite element software and define material properties, including but not limited to elastic modulus, Poisson's ratio, coefficient of thermal expansion α, thermal conductivity K, specific heat capacity, etc.; establish analysis types as needed, including but not limited to modal analysis, harmonic response, transient dynamics, steady-state / transient heat conduction and thermo-mechanical coupling analysis, etc.

[0074] S104: Apply vibration and temperature change boundary conditions to the finite element model, including but not limited to support constraints, contact, preload, surface heat dissipation coefficient, vibration spectrum, and temperature time history, solve the finite element model, and derive the nodal coordinates of the target optical surface. Figure 3 This is a displacement contour plot of the laser under random vibration. Figure 4 The image shown is a displacement contour plot of the lens.

[0075] S105: Use a self-written program to separate and process rigid body displacement and surface deformation data, and convert the processed data into a phase modulation matrix that can be accepted by the optical model.

[0076] S105-1: Data Preprocessing and Surface Deformation Extraction: The nodal coordinates derived from the finite element method are transformed to the optical local coordinate system, aligning the optical axes with the Z-axis, including unit transformation; subsequently, the deformation data of each optical surface are decoupled: homogeneous coordinate transformation and least squares fitting are used to extract the translation. , and With rotation amount , and As rigid body displacement; Zernike polynomial fitting is performed on the residual surface shape of the optical surface after removing the rigid body displacement to obtain the surface deformation;

[0077] S105-2: Optical Path Difference (OPD) Calculation: Based on the type of optical element, the rigid body displacement data and surface deformation data of the optical element are converted into the optical path difference caused by the laser passing through the element. Specifically, this includes:

[0078] For a mirror incident on the normal, the change in surface height... The resulting optical path difference on the reflected wavefront is:

[0079] (8);

[0080] For a transmitting element, the optical path difference is determined by both the change in geometric thickness and the change in refractive index:

[0081] (9);

[0082] in, Indicates the change in geometric optical path. L represents the local refractive index change within the element, and L represents the path length of light as it travels through the element.

[0083] S105-3: Phase modulation matrix construction and grid resampling, converting optical path difference into phase distribution according to formula (10). :

[0084] (10);

[0085] Since the node distribution in finite element methods is typically irregular, while optical diffraction calculations are based on regular meshes, spatial mapping and resampling are necessary: ​​interpolation algorithms are used to map the irregularly distributed node data onto a uniform N-mesh grid. x ×N y On the grid, ensure the sampling interval meets the requirements of diffraction calculations to avoid frequency aliasing. Finally, generate a complex-form phase modulation matrix. :

[0086] (11);

[0087] S106: The phase modulation matrix obtained in S105 Substituting into the laser optical performance calculation model of S102, the specific operation is as follows: in the spatial domain, the phase modulation matrix is ​​compared with the complex amplitude of the incident light field. Multiplying them together yields the disturbed light field. :

[0088] (12);

[0089] Subsequently, diffraction propagation and intracavity iterative calculations were continuously performed to finally obtain a stable output light field distribution. Key indicators were calculated and output: M² factor, power, spot geometric distortion, and centroid displacement. The M² factor can be calculated using the second-order moment method, based on the intensity second moment of the output light field, as shown below. Figure 5 The figure shows the calculated changes in beam quality and output power after the resonant cavity mirrors are deflected. Figure 6 The figure shows the distribution of the optical field of the laser under random vibration excitation. It can be seen that the optical field is significantly distorted and the centroid is significantly shifted.

[0090] In this implementation, the self-built optical performance model in step S102 and the self-written program in step S105 are graphical user interface applications used to import mirror coordinate data, generate phase modulation matrices, and automatically import them into the optical performance calculation model, reducing the human-computer interaction process. The perturbation boundary conditions applied in step S104 include, but are not limited to: random vibration, transient impact, and arbitrary temperature distribution or temperature change curves, and the ambient temperature range and time history can be specified.

[0091] The above-described method of the present invention is applicable to lasers with different cavity types and gain / pumping methods, and the scope of application is limited as follows: the cavity type includes stable cavity, flat-flat cavity (a resonant cavity structure composed of two parallel mirrors and the medium between them), and unstable cavity; the gain method includes end-face pumping and side-face pumping; when a small aperture or non-axisymmetric aperture exists in the cavity, the aperture function can be adjusted. As a multiplier acting on the field to simulate the truncation / mismatch effect.

[0092] In this implementation, iterative optical-thermal-mechanical coupling can be achieved in high-power scenarios, making it suitable for situations with significant laser absorption or thermal lensing effects. Specifically, it includes: completing the initial optical simulation according to step S101 above; calculating the gain medium and cavity mirror optical field distribution from the optical simulation. Apply the light field distribution as a heat source to the gain medium or cavity mirror in the finite element model; solve for the temperature field. Refractive index distribution caused by the corresponding temperature field distribution Repeat phase calculations and optical simulations until the temperature and light field distributions stabilize and converge.

[0093] Figure 7 A laser optomechanical-thermal coupling analysis system for vibration and temperature disturbance conditions is shown, comprising the following procedures:

[0094] The structural model building unit 701 is configured to: build a three-dimensional structural model of the laser based on the laser design parameters;

[0095] The optical model building unit 702 is configured to: establish a laser optical performance calculation model based on laser design parameters;

[0096] Finite element model building unit 703 is configured to: establish a finite element model for dynamic and thermodynamic analysis based on the three-dimensional structure model of the laser;

[0097] Boundary condition application element 704 is configured to apply vibration and temperature change boundary conditions to the finite element model and solve them to obtain coordinate displacement data of the mirror and related optical components.

[0098] The phase modulation generation unit 705 is configured to: separate and process the rigid body displacement and surface deformation of the coordinate displacement data, and convert the processed data into a phase modulation matrix acceptable to the laser optical performance calculation model;

[0099] The optical performance simulation unit 706 is configured to import the phase modulation matrix into the laser optical performance calculation model and perform optical propagation and cavity mode performance simulation evaluation.

[0100] It is understood that the aforementioned units can be individually or entirely merged into one or more other units, or some of the units can be further divided into multiple functionally smaller units. This achieves the same operation without affecting the technical effects of the embodiments of the present invention. The aforementioned units are based on logical functional division. In practical applications, the function of one unit can be implemented by multiple units, or the function of multiple units can be implemented by one unit. In other embodiments of the present invention, the system may also include other units. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented collaboratively by multiple units.

[0101] According to another embodiment of the present invention, the system of this embodiment can be constructed by running a computer program (including program code) capable of performing the steps involved in the corresponding method of the present invention on a general-purpose computing device, such as a computer, which includes processing elements and storage elements such as a central processing unit (CPU), random access memory (RAM), and read-only memory (ROM). The computer program can be recorded on, for example, a computer-readable recording medium, loaded into the aforementioned computing device through the computer-readable recording medium, and run therein.

[0102] Figure 8 A computer device is shown, which includes a processor 801, a communication interface 802, and a computer-readable storage medium 803. The processor 801, communication interface 802, and computer-readable storage medium 803 can be connected via a bus or other means.

[0103] The communication interface 802 is used to receive and send data. The computer-readable storage medium 803 can be stored in the memory of the electronic device. The computer-readable storage medium 803 is used to store computer programs, which include program instructions. The processor 801 is used to execute the program instructions stored in the computer-readable storage medium 803.

[0104] The processor 801 is the computing and control core of electronic devices. It is suitable for implementing one or more instructions, specifically for loading and executing one or more instructions to achieve corresponding methods or functions.

[0105] Processor 801 is configured to perform the following procedure:

[0106] Establish a three-dimensional structural model of the laser based on the laser design parameters;

[0107] Establish a laser optical performance calculation model based on laser design parameters;

[0108] A finite element model for dynamic and thermodynamic analysis was established based on the three-dimensional structural model of the laser.

[0109] Vibration and temperature change boundary conditions are applied to the finite element model and solved to obtain the coordinate displacement data of the mirror and related optical components;

[0110] The coordinate displacement data is separated and processed to separate rigid body displacement and surface deformation, and the processed data is converted into a phase modulation matrix acceptable to the laser optical performance calculation model.

[0111] The phase modulation matrix is ​​imported into the laser optical performance calculation model to perform optical propagation and cavity mode performance simulation evaluation.

[0112] This invention also provides a computer-readable storage medium, which is a memory device in an electronic device for storing programs and data. It is understood that the computer-readable storage medium here may include both built-in storage media in the electronic device and extended storage media supported by the electronic device. The computer-readable storage medium provides storage space for storing the processing system of the electronic device.

[0113] Furthermore, this storage space also contains one or more instructions suitable for loading and execution by the processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory; alternatively, it can also be at least one computer-readable storage medium located remotely from the aforementioned processor.

[0114] In one embodiment, the computer-readable storage medium stores one or more instructions; the processor loads and executes the one or more instructions stored in the computer-readable storage medium to perform the following process:

[0115] Establish a three-dimensional structural model of the laser based on the laser design parameters;

[0116] Establish a laser optical performance calculation model based on laser design parameters;

[0117] A finite element model for dynamic and thermodynamic analysis was established based on the three-dimensional structural model of the laser.

[0118] Vibration and temperature change boundary conditions are applied to the finite element model and solved to obtain the coordinate displacement data of the mirror and related optical components;

[0119] The coordinate displacement data is separated and processed to separate rigid body displacement and surface deformation, and the processed data is converted into a phase modulation matrix acceptable to the laser optical performance calculation model.

[0120] The phase modulation matrix is ​​imported into the laser optical performance calculation model to perform optical propagation and cavity mode performance simulation evaluation.

[0121] The present invention also provides a computer program product or computer program comprising computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the following process:

[0122] Establish a three-dimensional structural model of the laser based on the laser design parameters;

[0123] Establish a laser optical performance calculation model based on laser design parameters;

[0124] A finite element model for dynamic and thermodynamic analysis was established based on the three-dimensional structural model of the laser.

[0125] Vibration and temperature change boundary conditions are applied to the finite element model and solved to obtain the coordinate displacement data of the mirror and related optical components;

[0126] The coordinate displacement data is separated and processed to separate rigid body displacement and surface deformation, and the processed data is converted into a phase modulation matrix acceptable to the laser optical performance calculation model.

[0127] The phase modulation matrix is ​​imported into the laser optical performance calculation model to perform optical propagation and cavity mode performance simulation evaluation.

[0128] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed in this invention can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can implement the described functions using different methods for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0129] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of the present invention is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in or transmitted through a computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic cable, digital cable) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data processing device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive), etc.

[0130] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for laser optomechanical thermal coupling analysis under vibration and temperature disturbance conditions, characterized in that, The method comprises the following processes: establishing a three-dimensional structure model of the laser according to laser design parameters; establishing a laser optical performance calculation model based on the laser design parameters; establishing a finite element model for dynamic and thermal analysis based on the three-dimensional structure model of the laser; applying vibration and temperature change boundary conditions to the finite element model and solving to obtain coordinate displacement data of mirror surfaces and related optical elements; separating and processing the coordinate displacement data into rigid body displacement and surface deformation, and converting the processed data into a phase modulation matrix acceptable to the laser optical performance calculation model, including: deriving node coordinates obtained by finite element solving, transforming the node coordinates to an optical local coordinate system to align the optical axis with the Z axis, and completing unit conversion; based on the node coordinates after unit conversion, extracting the translation and rotation of each optical surface by using homogeneous coordinate transformation and least squares fitting; using the extracted translation and rotation to remove the rigid body displacement of the optical surface from the coordinate displacement data to obtain residual surface deformation data; performing polynomial fitting on the residual surface deformation data to obtain surface deformation data. Converting the rigid body displacement data and the surface deformation data of the optical element into optical path differences caused by the laser passing through the element, to obtain a reflection wavefront optical path difference of the mirror for normal incidence and an optical path difference of the transmission element wherein, represents a direction coordinate of a cross section of the optical element; represents a direction coordinate of a cross section of the optical element; Converting optical path difference into phase distribution : , represents the laser wavelength; The irregularly distributed node data is mapped onto a uniform grid using an interpolation algorithm, and finally, a complex form phase modulation matrix is generated : ; The phase modulation matrix is introduced into the laser optical performance calculation model, and optical propagation and cavity mode performance simulation evaluation is carried out, including: in the spatial domain, the phase modulation matrix is multiplied with the complex amplitude of the incident light field to obtain the disturbed light field : , and the diffraction propagation and cavity iteration calculation are continuously carried out, and finally the stable output light field distribution is obtained, and then the key indicators of optical propagation and cavity mode performance simulation evaluation are calculated and output.

2. The method for laser optomechanical thermal coupling analysis under vibration and temperature disturbance conditions according to claim 1, wherein the analysis type of the finite element model includes one or more combinations of modal analysis, harmonic response analysis, transient dynamics analysis, steady-state heat conduction analysis, transient heat conduction analysis, and thermal-mechanical coupling analysis.

3. The method for laser optomechanical thermal coupling analysis under vibration and temperature disturbance conditions according to claim 1, wherein optical propagation and cavity mode performance simulation evaluation are performed to obtain M2 factors, power, spot geometric distortion, and centroid displacement.

4. The method for laser optomechanical thermal coupling analysis under vibration and temperature disturbance conditions according to claim 1, wherein calculating the light field distribution of the gain medium and the cavity mirrors from a laser optical performance calculation model applying the light field distribution as a heat source to the finite element model to the gain medium or the cavity mirrors; solving the temperature field causing a refractive index distribution with the corresponding temperature field distribution repeating the phase calculation and the optical simulation until the temperature and the light field distribution converge stably, representing the cross section of the optical element directional coordinates; representing the cross section of the optical element directional coordinates, representing the propagation distance.

5. A system for laser optomechanical thermal coupling analysis under vibration and temperature disturbance conditions, characterized in that, The method comprises the following processes: a structure model construction unit configured to establish a three-dimensional structure model of the laser according to laser design parameters; an optical model construction unit configured to establish a laser optical performance calculation model based on the laser design parameters; a finite element model construction unit configured to establish a finite element model for dynamic and thermal analysis based on the three-dimensional structure model of the laser; a boundary condition application unit configured to apply vibration and temperature change boundary conditions to the finite element model and solve to obtain coordinate displacement data of mirror surfaces and related optical elements; a phase modulation generation unit configured to separate and process the coordinate displacement data into rigid body displacement and surface deformation, and convert the processed data into a phase modulation matrix acceptable to the laser optical performance calculation model, including: deriving node coordinates obtained by finite element solving, transforming the node coordinates to an optical local coordinate system to align the optical axis with the Z axis, and completing unit conversion; based on the node coordinates after unit conversion, extracting the translation and rotation of each optical surface by using homogeneous coordinate transformation and least squares fitting; using the extracted translation and rotation to remove the rigid body displacement of the optical surface from the coordinate displacement data to obtain residual surface deformation data; Polynomial fitting is performed on the residual surface data to obtain surface deformation data; The rigid body displacement data and surface deformation data of the optical element are converted into the optical path difference caused by the laser passing through the element, and the optical path difference of the reflected wavefront of the mirror with normal incidence is obtained. and the optical path difference through the element ,in, Representing the cross-section of an optical element Direction coordinates; Representing the cross-section of an optical element Direction coordinates; Converting optical path difference into phase distribution : , represents the laser wavelength; The irregularly distributed node data is mapped onto a uniform grid using an interpolation algorithm, and finally, a complex form phase modulation matrix is generated : ; The optical performance simulation unit is configured to: import the phase modulation matrix into the laser optical performance calculation model, perform optical propagation and cavity film performance simulation evaluation, including: multiplying the phase modulation matrix and the complex amplitude of the incident light field in the spatial domain to obtain the disturbed light field : , continuously performing diffraction propagation and cavity iteration calculation, finally obtaining the stable output light field distribution, and then calculating and outputting the key indicators of optical propagation and cavity mode performance simulation evaluation.

6. A computer device, comprising: Comprise: A processor and a computer readable storage medium; A processor adapted to execute a computer program; A computer readable storage medium having stored therein a computer program, which, when executed by the processor, implements the method for laser optomechanical thermal coupling analysis under vibration and temperature disturbance conditions according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, which is adapted to be loaded and executed by the processor to implement the method for laser optomechanical thermal coupling analysis under vibration and temperature disturbance conditions according to any one of claims 1 to 4.

8. A computer program product, characterised in that, The computer program product comprises a computer program, which, when executed by the processor, implements the method for laser optomechanical thermal coupling analysis under vibration and temperature disturbance conditions according to any one of claims 1 to 4.

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