A method, system, device, and medium for evaluating wavefront distortion based on transmission optical elements.

Abstract

The present application relates to the field of laser technology, specifically, a kind of evaluation method, system, equipment and medium based on wavefront distortion of transmission optical element;The method first calculates photon point set data, temperature field data, thermal deformation data according to the obtained incident laser parameters, optical system element parameters;Identify the key photon points of the incident surface and the transmission surface of the transmission optical element;Then, according to the identified key photon points, calculate the thermal deformation distortion difference of the transmission optical element surface and the thermal-optic effect difference of the transmission optical element;Finally, calculate the total difference, realize the fast and efficient calculation of the difference data of the transmission optical element, superimpose the difference on the corresponding ray tracing path, analyze any transmission optical element, which is beneficial to accurately calculate the difference of full-system ray tracing.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and more specifically, to a method, system, device, and medium for evaluating wavefront distortion based on transmissive optical elements. Background Technology

[0002] The thermal phase difference of a transmission optical element is caused by the deformation of the incident and transmission surfaces, as well as the phase difference due to changes in refractive index. The refractive index change is mainly due to two reasons: (1) the thermo-optic effect, i.e., temperature changes cause changes in refractive index; and (2) the elasto-optic effect, i.e., stress causes changes in refractive index. Generally, the latter can be ignored. Therefore, when calculating the thermal phase difference of a transmission optical element, only the distortion phase difference caused by the thermal deformation of the incident and transmission surfaces and the thermo-optic effect caused by changes in refractive index needs to be considered. However, the commercial software COMSOL Multiphysics does not have the function to calculate this thermal phase difference; furthermore, there are no reports on calculating the thermal phase difference of the lens transmission surface based on discrete photon point data obtained from finite element simulation as described in this invention. Summary of the Invention

[0003] This invention addresses the problem that existing distortion calculation methods and existing COMSOL Multiphysics software cannot efficiently calculate the distortion phase difference of thermo-optical effects and thermal deformation simultaneously based on finite element simulation data. It proposes an evaluation method, system, device, and medium based on wavefront distortion of a transmissive optical element. The method first calculates photon point set data, temperature field data, and thermal deformation data based on the acquired incident laser parameters and optical system element parameters; it then identifies key photon points on the incident and transmission surfaces of the transmissive optical element; next, based on the identified key photon points, it calculates the thermal deformation distortion phase difference and the thermo-optical effect phase difference of the transmissive optical element; finally, it calculates the total phase difference, achieving rapid and efficient calculation of the phase difference data of the transmissive optical element. This phase difference is then superimposed onto the corresponding ray tracing path for analysis of any transmissive optical element, which is beneficial for accurately calculating the phase difference of ray tracing across the entire system.

[0004] The specific implementation details of this invention are as follows:

[0005] A method for evaluating wavefront distortion based on transmissive optical elements, specifically including the following steps:

[0006] Step S1: Based on the obtained incident laser parameters and optical system element parameters, calculate the photon point set data, temperature field data, and thermal deformation data, and extract them to the MATLAB software workspace;

[0007] Step S2: Extract temperature field data and thermal deformation data from the MATLAB software workspace, and identify key photon points on the incident and transmission surfaces of the transmissive optical element based on the light propagation time sequence.

[0008] Step S3: Calculate the thermal deformation distortion phase difference on the surface of the transmission optical element based on the identified key photon points;

[0009] Step S4: Take the key photon point on the incident surface of the transmissive optical element and the key photon on the transmitted surface of the transmissive optical element as the beginning and end points of the thermal phase difference integration path, and calculate the phase difference of the thermo-optical effect of the transmissive optical element.

[0010] Step S5: Calculate the total phase difference of the transmissive optical element based on the phase difference caused by thermal deformation and distortion on the surface of the transmissive optical element and the phase difference caused by thermo-optical effect of the transmissive optical element.

[0011] Step S6: Based on the total phase difference of the transmissive optical element, analyze / evaluate the beam quality degradation and far-field laser intensity distribution deterioration caused by the total phase difference of the element to the optical system.

[0012] To better realize the present invention, step S1 further includes the following steps:

[0013] Step S11: Based on the obtained incident laser parameters and optical system element parameters, establish a simulation model and calculate the photon point set data;

[0014] Step S12: Calculate the light intensity distribution data of light propagation based on the established simulation model; the optical system elements include transmissive optical elements, reflective optical elements, gaseous media or liquid media;

[0015] Step S13: Call the ray heat source multiphysics port coupling heat transfer and mechanics of COMSOL Multiphysics software to calculate temperature field data and thermal deformation data;

[0016] Step S14: Extract the photon point set data, temperature field data, and thermal deformation data to the MATLAB software workspace.

[0017] To better realize the present invention, step S2 further includes the following steps:

[0018] Step S21: Call the mphinterp function to extract thermal deformation data from the MATLAB software workspace;

[0019] Step S22: Based on the propagation sequence of light, sequentially call the deformation data of the previous photon coordinate and divide it by the deformation data of the next photon coordinate. Based on the calculation results, obtain the key refracted photon point and the key incident photon point.

[0020] To better implement the present invention, further, the specific operation of step S22 is as follows: according to the propagation sequence of light, the deformation data of the previous photon coordinate is sequentially and cyclically called and divided by the deformation data of the next photon coordinate. If the division result is a non-numeric NaN, it indicates that the previous photon point is located inside the non-transmissive optical element. If the division result is a real number, it indicates that the previous photon point is located inside the transmissive optical element, thus obtaining the key refracted photon point on the incident surface of the first transmissive optical element, and recording the point before the key refracted photon point on the incident surface as the key incident photon point on the incident surface. If the result of the sequential division is a non-numeric NaN, then the previous photon point is still located inside the transmissive optical element, thus obtaining the key incident photon point on the transmissive surface of the first transmissive optical element, and recording the point after the key incident photon point as the key refracted photon point on the transmissive surface, thus completing the identification of the key photon point of the first transmissive optical element.

[0021] To better realize the present invention, step S3 further includes the following steps:

[0022] Step S31: Extract the coordinate data of key incident photon points, key refracted photon points, key incident photon points, and key refracted photon points on the incident surface, and obtain the incident ray vector and the refracted ray vector.

[0023] Step S32: Calculate the angle α between the incident ray and the refracted ray based on the incident ray vector and the refracted ray vector at the incident surface. inc ; Calculate the angle α between the incident ray and the refracted ray at the transmission surface based on the incident ray vector and the refracted ray vector. tra ;

[0024] Step S33: Based on the included angle α inc and included angle α tra Using Snell's law, calculate the angle of incidence θ at the incident surface. inc1 and the angle of refraction θ inc2 and the incident angle θ of the transmission surface. tra1 and the angle of refraction θ tra2 ;

[0025] Step S34: Based on the incident angle θ of the incident surface inc1 and the angle of refraction θ inc2 The incident angle θ of the transmission surface tra1 and the angle of refraction θ tra2 Calculate the phase difference in thermal deformation distortion between the incident and transmission surfaces of a transmission optical element, using wavenumber, incident region refractive index, and refractive index of the refracting region.

[0026] To better realize the present invention, the specific operation of step S4 is as follows: taking the key photon point on the incident surface of the transmissive optical element and the key photon on the transmission surface of the transmissive optical element as the beginning and end points of the thermal phase difference integration path, and calculating the phase difference of the thermo-optical effect of the transmissive optical element based on the internal temperature and internal refractive index of the transmissive optical element.

[0027] Based on the above-mentioned evaluation method for wavefront distortion of transmissive optical elements, in order to better realize the present invention, a further evaluation system for wavefront distortion of transmissive optical elements is proposed to perform the above-mentioned evaluation method for wavefront distortion of transmissive optical elements; including an acquisition unit, a key photon point identification unit, a surface thermal deformation distortion calculation unit, a thermo-optical effect phase difference calculation unit, a total phase difference calculation unit, and an evaluation unit.

[0028] The acquisition unit is used to calculate photon point set data, temperature field data, and thermal deformation data based on the acquired incident laser parameters and optical system element parameters, and extract them to the MATLAB software workspace.

[0029] The key photon point identification unit is used to extract temperature field data and thermal deformation data from the MATLAB software workspace, and identify key photon points on the incident and transmission surfaces of the transmissive optical element according to the light propagation sequence.

[0030] The surface thermal deformation distortion calculation unit is used to calculate the phase difference of surface thermal deformation distortion of the transmissive optical element based on the identified key photon points.

[0031] The thermo-optical effect phase difference calculation unit is used to calculate the thermo-optical effect phase difference of the transmissive optical element by taking the key photon point on the incident surface of the transmissive optical element and the key photon on the transmitted surface of the transmissive optical element as the beginning and end points of the thermal phase difference integration path.

[0032] The total phase difference calculation unit is used to calculate the total phase difference of the transmissive optical element based on the phase difference caused by thermal deformation distortion on the surface of the transmissive optical element and the phase difference caused by thermo-optical effect of the transmissive optical element.

[0033] The evaluation unit is used to analyze / evaluate the beam quality degradation and far-field laser intensity distribution deterioration problems caused by the total phase difference of the transmissive optical element to the optical system, based on the total phase difference of the transmissive optical element.

[0034] Based on the above-mentioned evaluation method for wavefront distortion of transmissive optical elements, in order to better realize the present invention, an electronic device is further proposed, including a memory and a processor; the memory stores a computer program; when the computer program is executed on the processor, the above-mentioned evaluation method for wavefront distortion of transmissive optical elements is implemented.

[0035] Based on the above-mentioned evaluation method for wavefront distortion of transmissive optical elements, in order to better realize the present invention, a computer-readable storage medium is further proposed, wherein computer instructions are stored on the computer-readable storage medium; when the computer instructions are executed on the above-mentioned electronic device, the above-mentioned evaluation method for wavefront distortion of transmissive optical elements is realized.

[0036] The present invention has the following beneficial effects:

[0037] (1) The phase difference calculated by the present invention can be superimposed on the corresponding ray tracing path, and can be used to analyze any transmissive optical element, thereby helping to accurately calculate the phase difference of the ray tracing of the whole system.

[0038] (2) The surface thermal deformation distortion calculation method of this invention can quickly and efficiently calculate the phase difference data of transmission optical elements. It is applicable to various types of transmission optical elements such as planar, spherical and aspherical surfaces, and can provide a convenient way to calculate the phase difference problem of laser transmission channels through multi-physics field coupling of light, heat, force and fluid. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of ray tracing provided by the present invention.

[0040] Figure 2 A schematic diagram of the incident angle and refraction angle provided for this invention.

[0041] Figure 3 This is a schematic diagram for calculating surface thermal deformation distortion provided by the present invention.

[0042] Figure 4 A schematic flowchart of the evaluation method for wavefront distortion based on transmission optical elements provided by the present invention. Detailed Implementation

[0043] To more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments, and therefore should not be regarded as a limitation on the scope of protection. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Example 1:

[0046] This embodiment proposes an evaluation method for wavefront distortion based on transmission optical elements, which specifically includes the following steps.

[0047] Step S1: Based on the obtained incident laser parameters and optical system element parameters, calculate the photon point set data, temperature field data, and thermal deformation data, and extract them to the MATLAB software workspace.

[0048] Step S1 specifically includes the following steps:

[0049] Step S11: Based on the obtained incident laser parameters and optical system element parameters, establish a simulation model and calculate the photon point set data;

[0050] Step S12: Calculate the light intensity distribution data of light propagation based on the established simulation model; the optical system elements include transmissive optical elements, reflective optical elements, gaseous media or liquid media;

[0051] Step S13: Call the ray heat source multiphysics port coupling heat transfer and mechanics of COMSOL Multiphysics software to calculate temperature field data and thermal deformation data;

[0052] Step S14: Extract the photon point set data, temperature field data, and thermal deformation data to the MATLAB software workspace.

[0053] Step S2: Extract temperature field data and thermal deformation data from the MATLAB software workspace, and identify key photon points on the incident and transmission surfaces of the transmissive optical element based on the light propagation time sequence.

[0054] To better realize the present invention, step S2 further includes the following steps:

[0055] Step S21: Call the mphinterp function to extract thermal deformation data from the MATLAB software workspace;

[0056] Step S22: Based on the propagation sequence of light, sequentially call the deformation data of the previous photon coordinate and divide it by the deformation data of the next photon coordinate. Based on the calculation results, obtain the key refracted photon point and the key incident photon point.

[0057] The specific operation of step S22 is as follows: According to the propagation sequence of light, the deformation data of the previous photon coordinate is sequentially called and divided by the deformation data of the next photon coordinate. If the division result is a non-numeric NaN, it means that the previous photon point is located inside the non-transmissive optical element. If the division result is a real number, it means that the previous photon point is located inside the transmissive optical element. The key refracted photon point of the incident surface of the first transmissive optical element is obtained, and the point before the key refracted photon point of the incident surface is recorded as the key incident photon point of the incident surface. If the result of the sequential division is a non-numeric NaN, the previous photon point is still located inside the transmissive optical element. The key incident photon point of the transmissive optical element is obtained, and the point after the key incident photon point is recorded as the key refracted photon point of the transmissive surface, thus completing the identification of the key photon point of the transmissive optical element.

[0058] Step S3: Calculate the thermal deformation distortion phase difference on the surface of the transmission optical element based on the identified key photon points.

[0059] Step S31: Extract the coordinate data of key incident photon points, key refracted photon points, key incident photon points, and key refracted photon points on the incident surface, and obtain the incident ray vector and the refracted ray vector.

[0060] Step S32: Calculate the angle α between the incident ray and the refracted ray based on the incident ray vector and the refracted ray vector at the incident surface. inc ; Calculate the angle α between the incident ray and the refracted ray at the transmission surface based on the incident ray vector and the refracted ray vector. tra ;

[0061] Step S33: Based on the included angle α inc and included angle α tra Using Snell's law, calculate the angle of incidence θ at the incident surface. inc1 and the angle of refraction θ inc2 and the incident angle θ of the transmission surface. tra1 and the angle of refraction θ tra2 ;

[0062] Step S34: Based on the incident angle θ of the incident surface inc1 and the angle of refraction θ inc2 The incident angle θ of the transmission surface tra1 and the angle of refraction θ tra2Calculate the phase difference in thermal deformation distortion between the incident and transmission surfaces of a transmission optical element, using wavenumber, incident region refractive index, and refractive index of the refracting region.

[0063] Step S4: Using the key photon point on the incident surface of the transmissive optical element and the key photon on the transmitted surface of the transmissive optical element as the beginning and end points of the thermal phase difference integration path, calculate the phase difference of the thermo-optical effect of the transmissive optical element.

[0064] The specific operation of step S4 is as follows: taking the key photon point on the incident surface of the transmissive optical element and the key photon on the transmitted surface of the transmissive optical element as the beginning and end points of the thermal phase difference integration path, and calculating the phase difference of the thermo-optical effect of the transmissive optical element based on the internal temperature and internal refractive index of the transmissive optical element.

[0065] Step S5: Calculate the total phase difference of the transmissive optical element based on the phase difference caused by thermal deformation and distortion on the surface of the transmissive optical element and the phase difference caused by thermo-optical effect of the transmissive optical element.

[0066] Step S6: Based on the total phase difference of the transmissive optical element, analyze / evaluate the beam quality degradation and far-field laser intensity distribution deterioration caused by the total phase difference of the element to the optical system.

[0067] Working principle: This embodiment first calculates photon point set data, temperature field data, and thermal deformation data based on the acquired incident laser parameters and optical system element parameters; identifies key photon points on the incident and transmission surfaces of the transmissive optical element; then, based on the identified key photon points, calculates the phase difference of thermal deformation distortion on the surface of the transmissive optical element and the phase difference of thermo-optical effect of the transmissive optical element; finally, calculates the total phase difference, realizing the rapid and efficient calculation of phase difference data of the transmissive optical element, superimposing the phase difference onto the corresponding ray tracing path, and analyzing any transmissive optical element, which is beneficial for accurately calculating the phase difference of ray tracing of the entire system.

[0068] Example 2:

[0069] This embodiment is based on the above embodiment 1, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a specific embodiment will be described in detail.

[0070] This embodiment uses a discretized photon point thermal phase difference calculation method based on ray tracing to calculate the thermal deformation and thermo-optical distortion phase difference of the reconstructed transmissive optical element. This can be superimposed onto the entire system's ray path for comprehensive thermal phase difference calculation and analysis. The specific implementation steps are as follows.

[0071] Step S1: Based on the obtained incident laser parameters and optical system element parameters, calculate the photon point set data, temperature field data, and thermal deformation data, and extract them to the MATLAB software workspace.

[0072] Step S11: Ray Tracing Calculation. Obtain the parameters of the incident laser and the optical system elements, and use the geometric optics module of COMSOL Multiphysics software to calculate the photon point set data of the system. The photon point set data mainly includes discrete photon point coordinates, ray numbers, optical path lengths, and light intensity, etc.

[0073] Step S12: Multiphysics Coupling Calculation. Obtain the parameters of the incident laser and the parameters of the optical system elements, which may include transmissive optical elements, reflective optical elements, and gaseous or liquid media, but include at least one transmissive optical element; based on the parameters of the incident laser and the parameters of the optical system, calculate the light intensity distribution data of the propagating light using the geometric optics module of COMSOL Multiphysics software.

[0074] Step S13: Couple the light intensity distribution data obtained in step S12 with the heat transfer module and the mechanical module to calculate the temperature field data and thermal deformation data of the optical system;

[0075] Step S14: Extract temperature field data, thermal deformation data, and photon point set data to the MATLAB software workspace using the co-simulation function of COMSOL Multiphysics and MATLAB software. In MATLAB, the mphinterp function can be used to extract temperature field and thermal deformation data, and the mphparticle function can be used to extract photon point set data.

[0076] Step S2: Key Photon Point Identification. In step S14, the deformation dataset corresponding to the mechanical module is extracted using the "mphinterp function". In the global coordinate system, only the deformation data corresponding to the photon coordinates located in the transmissive optical element are real numbers; otherwise, they are non-numeric "NaN". For the propagation time sequence of a single ray in the system, the deformation data of the previous photon coordinate is cyclically divided by the deformation data of the next photon coordinate. If the division result is a non-numeric "NaN", it indicates that the previous photon point is located inside a non-transmissive optical element. If the division result is a real number, it indicates that the previous photon point is located inside a transmissive optical element, denoted as the "critical refracted photon point" on the incident surface of the first transmissive optical element. The point preceding this point is the "critical incident photon point" on the incident surface. If the division results in a non-numeric "NaN" for the next consecutive divisions, the previous photon point is still located inside a transmissive optical element, denoted as the "critical incident photon point" on the transmission surface of the first transmissive optical element. The point following this point is the "critical refracted photon point" on the transmission surface, thus completing the identification of the critical photon point of the first transmissive optical element. Based on the above method, the critical photon points of transmissive optical elements in subsequent optical systems can be identified.

[0077] Step S3: Calculation of thermal deformation and distortion on the surface of optical components.

[0078] Step S31: Based on the coordinate data of the "key incident photon point" and "key refracted photon point" of the surface extracted in the previous step, this surface can be the incident surface and the transmission surface of a transmission optical element. For the incident surface, P inc1 (x inc1 ,y inc1 ,z inc1 ) and P inc2 (x inc2 ,y inc2 ,z inc2 ) form the incident ray vector P inc3 (x inc3 ,y inc3 ,z inc3 ) and P inc4 (x inc4 ,y inc4 ,z inc4 ) forms the vector of refracted rays The angle between the incident ray and the refracted ray is For a transmission surface, P tra1 (x tra1 ,y tra1 ,z tra1 ) and P tra2 (x tra2 ,y tra2 ,z tra2) form the incident ray vector P tra3 (x tra3 ,y tra3 ,z tra3 ) and P tra4 (x tra4 ,y tra4 ,z tra4 ) forms the vector of refracted rays The angle between the incident ray and the refracted ray is

[0079]

[0080] Step S32: Calculate the incident angle and refraction angle for the incident surface of the optical element: using Snell's law and the angle α between the incident ray and the refracted ray. inc Equation (1-1) can be used to calculate the incident angle θ. inc1 and the angle of refraction θ inc2 .

[0081]

[0082] In the formula, θ inc1 and θ inc2 These are the angle of incidence and the angle of refraction of the incident surface, respectively, n inc1 and n inc2 These are the refractive indices of the incident region and the refractive indices of the refracting region of the incident surface, respectively.

[0083] Calculation of the incident and refraction angles at the transmission surface of an optical element: using Snell's law and the angle α between the incident and refracted rays. tra Equation (1-2) can be used to calculate the incident angle θ. tra1 and the angle of refraction θ tra2 .

[0084]

[0085] In the formula, θ tra1 and θ tra2 These are the angle of incidence and the angle of refraction of the incident surface, respectively, n tra1 and n tra2 These are the refractive indices of the incident region and the refractive indices of the refracting region of the incident surface, respectively.

[0086] Step S33: Calculation of thermal deformation and distortion on the surface of optical components: such as Figure 3 As shown, the thermal deformation and distortion phase difference between the incident surface and the transmission surface of the transmission optical element is as shown in equation (2) Δφ inc and Δφ tra .

[0087]

[0088] In the formula, k is the wave number, and d inc and d tra The deformation of the incident and transmitted surfaces.

[0089] Step S4: Calculation of the phase difference of the thermo-optical effect of the optical element. Extract the "key refracted photon point" on the incident surface and the "key incident photon point" on the transmission surface inside the transmission optical element, and use them as the start and end points of the thermal phase difference integration path.

[0090]

[0091] Where T(x,y,z) is the internal temperature of the transmission optical element in step S14, and n is the internal refractive index of the transmission optical element.

[0092] Step S5: Calculate the total phase difference of the transmission optical element.

[0093] Δφ total =Δφ inc +Δφ themo_optics +Δφ tra (4)

[0094] Working Principle: This embodiment addresses the problem that existing technologies and COMSOL Multiphysics software cannot efficiently calculate the distortion phase difference of thermo-optical effects and thermal deformation based on finite element simulation data simultaneously. Furthermore, the phase difference calculated in this embodiment can be superimposed on the corresponding ray tracing path, allowing analysis of any transmissive optical element and thus facilitating accurate calculation of the phase difference in the entire system's ray trajectory. The calculation method in this embodiment can quickly and efficiently calculate the phase difference data of transmissive optical elements. It is applicable to various applications of transmissive optical elements, including planar, spherical, and aspherical surfaces, providing a convenient method for calculating the phase difference of laser transmission channels using multiphysics coupling of light, heat, force, and fluid.

[0095] The other parts of this embodiment are the same as those in Embodiment 1 above, so they will not be described again.

[0096] Example 3:

[0097] Based on any one of Embodiments 1-2 above, this embodiment proposes an evaluation system for wavefront distortion of transmissive optical elements, used to perform the above-described evaluation method for wavefront distortion of transmissive optical elements; it includes an acquisition unit, a key photon point identification unit, a surface thermal deformation distortion calculation unit, a thermo-optical effect phase difference calculation unit, a total phase difference calculation unit, and an evaluation unit.

[0098] The acquisition unit is used to calculate photon point set data, temperature field data, and thermal deformation data based on the acquired incident laser parameters and optical system element parameters, and extract them to the MATLAB software workspace.

[0099] The key photon point identification unit is used to extract temperature field data and thermal deformation data from the MATLAB software workspace, and identify key photon points on the incident and transmission surfaces of the transmissive optical element according to the light propagation sequence.

[0100] The surface thermal deformation distortion calculation unit is used to calculate the phase difference of surface thermal deformation distortion of the transmissive optical element based on the identified key photon points.

[0101] The thermo-optical effect phase difference calculation unit is used to calculate the thermo-optical effect phase difference of the transmissive optical element by taking the key photon point on the incident surface of the transmissive optical element and the key photon on the transmitted surface of the transmissive optical element as the beginning and end points of the thermal phase difference integration path.

[0102] The total phase difference calculation unit is used to calculate the total phase difference of the transmissive optical element based on the phase difference caused by thermal deformation distortion on the surface of the transmissive optical element and the phase difference caused by thermo-optical effect of the transmissive optical element.

[0103] The evaluation unit is used to analyze / evaluate the beam quality degradation and far-field laser intensity distribution deterioration problems caused by the total phase difference of the transmissive optical element to the optical system, based on the total phase difference of the transmissive optical element.

[0104] This embodiment also proposes an electronic device, including a memory and a processor; the memory stores a computer program; when the computer program is executed on the processor, it implements the above-described evaluation method for wavefront distortion based on transmissive optical elements.

[0105] This embodiment also proposes a computer-readable storage medium storing computer instructions; when the computer instructions are executed on the aforementioned electronic device, the aforementioned evaluation method based on wavefront distortion of a transmission optical element is implemented.

[0106] The other parts of this embodiment are the same as any one of the above embodiments 1-2, so they will not be described again.

[0107] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for evaluating wavefront distortion based on a transmissive optical element, characterized in that, Specifically comprising the following steps: Step S1: According to the obtained incident laser parameters, optical system element parameters, calculate the photon point set data, temperature field data, thermal deformation data, and extract to MATLAB software workspace; Step S2: Extract the temperature field data and thermal deformation data from the MATLAB software workspace, and identify the key photon points on the incident surface and the transmission surface of the transmission optical element according to the light propagation time sequence; Step S3: According to the identified key photon points, calculate the thermal deformation distortion difference of the transmission optical element surface; Step S4: Take the key photon points on the incident surface of the transmission optical element and the key photon points on the transmission surface of the transmission optical element as the beginning and end points of the thermal difference integral path, and calculate the thermal-optical effect difference of the transmission optical element; Step S5: According to the thermal deformation distortion difference of the transmission optical element surface and the thermal-optical effect difference of the transmission optical element, calculate the total difference of the transmission optical element; Step S6: According to the total difference of the transmission optical element, evaluate the beam quality or far-field laser distribution intensity.

2. The method of claim 1, wherein, The step S1 specifically comprises the following steps: Step S11: According to the obtained incident laser parameters, optical system element parameters, establish a simulation model, and calculate the photon point set data; Step S12: According to the established simulation model, calculate the light intensity distribution data of light propagation; The optical system elements include transmission optical elements, reflection optical elements, gaseous media or liquid media; Step S13: According to the light intensity distribution data, call the coupled heat transfer module and the mechanics module of COMSOL Multiphysics software to calculate the temperature field data and the thermal deformation data; Step S14: Extract the photon point set data, temperature field data and thermal deformation data to the MATLAB software workspace.

3. The method of claim 1, wherein the method is based on a wavefront distortion of a transmissive optical element. The step S2 specifically comprises the following steps: Step S21: Call the mphinterp function to extract the thermal deformation data from the MATLAB software workspace; Step S22: According to the propagation time sequence of the light, call the deformation data of the previous photon coordinate divided by the deformation data of the next photon coordinate in turn, and obtain the key refractive photon point and the key incident photon point according to the calculation result.

4. The method of claim 3, wherein the method further comprises: The specific operation of step S22 is: According to the propagation time sequence of the light, call the deformation data of the previous photon coordinate divided by the deformation data of the next photon coordinate in turn, if the result of division is non-number NaN, it indicates that the previous photon point is located inside the non-transmission optical element, if the result of division is a real number, it indicates that the previous photon point is located inside the transmission optical element, and the key refractive photon point on the incident surface of the transmission optical element is obtained, and the previous point of the key refractive photon point on the incident surface is recorded as the key incident photon point on the incident surface; If the result of the continued division appears non-number NaN, the previous photon point is still located inside the transmission optical element, and the key incident photon point on the transmission surface of the transmission optical element is obtained, and the next point of the key incident photon point is recorded as the key refractive photon point on the transmission surface, and the key photon point identification of the transmission optical element is completed.

5. The method of claim 4, wherein the method further comprises: The step S3 specifically comprises the following steps: Step S31: extracting coordinate data of key incident photon points of the incident surface, key refracted photon points of the incident surface, key incident photon points of the transmission surface, and key refracted photon points of the transmission surface to obtain incident ray vectors and refracted ray vectors; Step S32: according to the incident light vector and the refracted light vector of the incident surface, calculate the included angle a between the incident light and the refracted light of the incident surface inc ; according to the incident light vector and the refracted light vector of the transmission surface, calculate the included angle a between the incident light and the refracted light of the transmission surface tra ; Step S33: According to the included angle a inc and the included angle a tra , Snell's law is called to calculate the incident angle θ inc1 and the refraction angle θ inc2 of the incident surface, and the incident angle θ tra1 and the refraction angle θ tra2 of the transmission surface, respectively; Step S34: Calculate the difference between the thermal deformation distortion of the incident surface and the transmission surface of the transmission-type optical element according to the incident angle θ inc1 and the refraction angle θ inc2 of the incident surface, the incident angle θ tra1 and the refraction angle θ tra2 of the transmission surface, the wave number, the incident region refractive index, and the refractive region refractive index.

6. The method of claim 1, wherein, The specific operation of the step S4 is: taking the key photon points of the incident surface of the transmission optical element and the key photon points of the transmission surface of the transmission optical element as the beginning and end points of the thermal phase difference integral path, and calculating the thermal-optical effect phase difference of the transmission optical element according to the extracted temperature field data and the refractive index inside the transmission optical element.

7. An evaluation system for wavefront aberration of a transmissive optical element based on the evaluation method of wavefront aberration of a transmissive optical element according to claim 1, characterized in that, The evaluation method comprises a collection unit, a key photon point identification unit, a surface thermal deformation distortion calculation unit, a thermal-optical effect phase difference calculation unit, a total phase difference calculation unit, and an evaluation unit. The collection unit is configured to calculate photon point set data, temperature field data, and thermal deformation data according to the obtained incident laser parameters and optical system element parameters, and extract the data to a MATLAB software workspace. The key photon point identification unit is configured to extract the temperature field data and the thermal deformation data from the MATLAB software workspace, and identify the key photon points of the incident surface and the transmission surface of the transmission optical element according to the ray propagation time sequence. The surface thermal deformation distortion calculation unit is configured to calculate the surface thermal deformation distortion phase difference of the transmission optical element according to the identified key photon points. The thermal-optical effect phase difference calculation unit is configured to take the key photon points of the incident surface of the transmission optical element and the key photon points of the transmission surface of the transmission optical element as the beginning and end points of the thermal phase difference integral path, and calculate the thermal-optical effect phase difference of the transmission optical element. The total phase difference calculation unit is configured to calculate the total phase difference of the transmission optical element according to the surface thermal deformation distortion phase difference of the transmission optical element and the thermal-optical effect phase difference of the transmission optical element. The evaluation unit is configured to evaluate the beam quality or the far-field laser distribution intensity according to the total phase difference of the transmission optical element.

8. An electronic device, comprising: The evaluation method comprises a memory and a processor; the memory stores a computer program; and when the computer program is executed on the processor, the evaluation method based on the wavefront distortion of the transmission optical element is realized.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions; and when the computer instructions are executed on the electronic device of claim 8, the evaluation method based on the wavefront distortion of the transmission optical element is realized.

Images