Reflection-type homogenizing integral mirror, modeling method thereof and electronic equipment

Abstract

The invention provides a reflective homogenizing integral mirror, a modeling method thereof and electronic equipment, and relates to the field of optical element design. The modeling method comprises a basic optical structure construction step, a reflecting surface construction step, a reference line construction step, a cylinder construction step and a mirror surface cutting step, through modeling simulation, the integral mirror surface type is determined when the homogenization uniformity requirement is met, model parameters are adjusted if the requirement is not met, and the parameters are adjusted until the requirement is finally met. According to the modeling method, a 3D modeling software modeling mode is adopted for optimizing iteration, compared with a traditional algorithm optimization iteration design, the modeling method is simpler and more practical, the design threshold and hardware requirements of research and development personnel are greatly reduced, industrialization is easier, and meanwhile the machinability of the surface type can be effectively guaranteed; and compared with a processing mode under algorithm driving, the method is simpler and more practical, the programming difficulty of processing personnel on an algorithm program before lens processing is also reduced, and the processing operability is improved.

Description

Technical Field

[0001] The present application relates to the field of optical element design, and in particular to a reflective homogenizing integrator mirror, a modeling method thereof, and an electronic device. Background Art

[0002] In fiber-optic laser processing applications, in order to ensure good surface and depth consistency, it is usually necessary to shape the energy distribution of the laser beam to achieve a flat-top distribution. Metal reflectors, due to their excellent thermal conductivity and water cooling capabilities, can withstand high-power lasers while ensuring a small aperture, especially metal integrators, which can achieve unidirectional spot flattening.

[0003] In the prior art, the design of metal integrator mirrors is based on light field mapping, and the required surface morphology of the integrator mirror is achieved by optimizing the mirror parameters through algorithm iteration. The problem of slow or non-convergence of the algorithm is prone to occur, resulting in low design efficiency and poor homogenization effect; the algorithm is highly complex, which increases the design threshold and hardware requirements, making it difficult to achieve industrialization; and the optimized design surface features are prone to abnormalities, which makes it difficult or even impossible to process. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a reflective homogenizing integrator mirror, a modeling method thereof, and an electronic device. By determining basic geometric parameters, constructing a reflective surface curve segment, adjusting a reference line, constructing a cylinder, and cutting a mirror unit, a complex algorithm optimization process is avoided, uniform distribution and precise guidance of the light beam are ensured, and ultimately an efficient, stable, and industrializable reflective homogenizing integrator mirror design is achieved.

[0005] In a first aspect, an embodiment of the present application provides a modeling method for a reflective homogenizing integrator, the modeling method comprising: a basic optical structure construction step: determining the geometric parameters of the basic optical structure of the reflective homogenizing integrator; wherein the geometric parameters include: incident focal length F1, exit focal length F2, uniform distribution length L1 of the homogenized light spot, beam angle a, incident light point s1, mirror center point s2, the center point of L1 coincides with the end of F2 as s3; a reflection surface construction step, drawing n smooth curve segments k on the plane formed by F1, F2 and L1 i , and connect n smooth curves in order to obtain the reflection surface; among them, there is a smooth line segment k v Passing s2, i∈[3,n], v∈[3,n], n≥3; reference line construction step, on the plane formed by F1, F2 and L1, draw a reference line segment L3 parallel to L1 and at a distance DF from L1; wherein the length of L3 is greater than the length of L1; cylinder construction step, draw a circular plane perpendicular to F1 and passing through s2, stretch the circular plane to obtain a cylinder; wherein the diameter of the circular plane is smaller than the smooth curve segment ki The length of the projection line on the plane is d i and each projection line has two intersection points with the circular plane; a mirror cutting step, dividing the reflecting surface into a plurality of mirror units, and cutting the cylinder based on the plurality of mirror units to obtain a reflective homogenizing integrator.

[0006] In the above implementation process, the modeling method of the reflective homogenizing integrator provided in the embodiment of the present application avoids the complex algorithm optimization process by determining the basic geometric parameters, constructing the reflective surface curve segment, adjusting the reference line, constructing the cylinder and cutting the mirror unit, ensuring the uniform distribution and precise guidance of the light beam, and finally realizing the efficient, stable and industrializable reflective homogenizing integrator design. Compared with the traditional algorithm optimization design based on light field mapping, the modeling method of the reflective homogenizing integrator provided in the embodiment of the present application has higher design efficiency, lower computational complexity and stronger manufacturability, and is suitable for large-scale production and application.

[0007] Optionally, in an embodiment of the present application, in the reference line construction step, the calculation formula of the defocus amount DF is: Wherein, L2 is the non-uniform distribution length, b is the divergence half angle of the point divergent light source; on the plane formed by F1, F2 and L1, a reference line segment L3 is drawn parallel to L1 and at a distance DF from L1, including: In the case of , the center point of L3 is located on the F2 line segment; In this case, the center point of L3 is located on the extension line of segment F2.

[0008] In the above implementation process, the modeling method of the reflective homogenizing integrator provided in this embodiment sets the position of the reference line L3 by the defocus amount, and can flexibly adjust the focus and distribution of the light beam under different light sources and homogenization requirements, thereby ensuring an efficient light spot homogenization effect, and can realize a high-performance and mass-producible reflective homogenizing integrator to meet various application requirements.

[0009] Optionally, in an embodiment of the present application, in the step of constructing the reflecting surface, the smooth curve segment includes an arc segment, a parabola segment or an ellipse segment.

[0010] In the above implementation process, arc segments are suitable for simpler designs, while parabolic segments and elliptical segments can provide better beam control under more complex homogenization requirements. In the face of different needs, different types of curve segments can be selected for use. The modeling methods provided in the embodiments of this application can achieve high-precision and high-efficiency beam homogenization effects, meet the needs of various industrial and scientific research applications, and maintain low design complexity and high industrial realization capabilities.

[0011] Optionally, in the embodiment of the present application, in the above-mentioned step of constructing the reflecting surface, the starting point of k1 is t1, k n-1 With k n The intersection point is t n , k n The end point is t n+1 ; F1 is respectively related to the above t1 to t n+1 The line connecting any two adjacent points in the image is reflected by the corresponding smooth curve segment, and the reflected lines cross and pass through the two endpoints of L1 respectively; F1 is respectively v The corresponding t v and t v-1 The connection of k v After reflection, the reflected lines cross and the intersection point is on F2.

[0012] In the above implementation process, the modeling method provided in the embodiment of the present application, through geometric design, accurately controls the intersection of each smooth curve segment and the incident light, and effectively manages the distribution of the reflected light on the focal plane, achieving ideal spot uniformity. It effectively overcomes the problems of slow convergence and high computational complexity in the traditional algorithm optimization design process, thereby making the design of the reflective homogenizing integrator more efficient and easier to realize industrial production.

[0013] Optionally, in the embodiment of the present application, in the above-mentioned step of constructing the reflecting surface, the intersection point of the reflecting line corresponding to the smooth curve segment is m i ; In the reference line construction step, L3 is divided into i equal parts to obtain i+1 interval points on L3; In the mirror cutting step, the reflection surface is divided into a plurality of mirror units, and the cylinder is cut based on the plurality of mirror units, including: on the plane formed by F1, F2 and L1, any k i Extend; connect the i+1 interval points to the m i Connect and extend, and with k i Intersect with the extension line of s1 to obtain i+1 target intersection points; connect the i+1 target intersection points, i+1 interval points and s1 to obtain i+1 triangles; based on the i+1 triangles, obtain i+1 arc figures; use the arc closed figure to loft and cut to obtain mirror units, and cut the cylinder based on multiple mirror units.

[0014] In the above implementation process, the modeling method provided in the embodiment of the present application successfully divides the reflective surface into multiple mirror units through precise geometric design and cutting methods. The shape and optical properties of each mirror unit are strictly controlled throughout the design process, ensuring the stability of the homogenization effect and being able to be smoothly generated during the processing process. The modeling method provided in the embodiment of the present application avoids the design complexity and high algorithm complexity in the traditional method, simplifies the design process, lowers the design threshold, and improves the operability of industrial production.

[0015] Optionally, in the embodiment of the present application, based on i+1 triangles, i+1 arc graphics are obtained, including: establishing i+1 target planes; wherein each target plane passes through the target intersection point and is perpendicular to the opposite side of the target intersection point of the corresponding triangle; making i+1 target arcs with the intersection point of the target plane and the connecting line segment of the corresponding interval point and s1 as the center; respectively connecting each target arc with the corresponding k i The intersection of , obtain i+1 arc images.

[0016] In the above implementation process, the modeling method provided in the embodiment of the present application obtains i+1 arc figures based on i+1 triangles, and the i+1 arc closed figure is cut out by lofting, that is, the mirror unit cutout generation at the corresponding position of the cylinder is realized. The embodiment of the present application uses 3D model for processing, which is simpler and more practical than the processing method driven by the algorithm, and also reduces the difficulty of the processing personnel in compiling the algorithm program before the lens processing, and improves the processing operability.

[0017] Optionally, in the embodiment of the present application, the projection line length d is adjusted i and / or L3 to adjust the rectangular flat-top spot energy distribution in the focal plane of the reflective homogenizing integrator.

[0018] In the above implementation process, by adjusting the projection line length di and / or the reference line segment L3, the energy distribution of the light spot on the focal plane of the reflective homogenizing integrator can be accurately controlled. Compared with the traditional design method, the modeling method of the reflective homogenizing integrator provided in the embodiment of the present application adopts 3D modeling software modeling mode to optimize iteration, which is simpler and more practical than the traditional algorithm optimization iterative design, greatly reduces the design threshold and hardware requirements of R&D personnel, and is easier to industrialize.

[0019] In a second aspect, an embodiment of the present application provides a reflective homogenizing integrator, which is obtained by the modeling method of the reflective homogenizing integrator of any one of the first aspects; the reflective homogenizing integrator includes a mirror having at least 3 bandwidth surfaces; the reflective homogenizing integrator base material includes a metal material having a high reflective property to incident light.

[0020] In the above implementation process, the reflective homogenizing integrator provided in the embodiment of the present application is particularly suitable for beam shaping under point divergent light sources. Compared with ordinary integrators, it reduces the number of lenses, reduces costs and is more stable; especially in high-power light source applications, it can provide more stable and efficient optical performance, and the design and manufacturing process has high industrial operability.

[0021] In a third aspect, an embodiment of the present application provides an electronic device, comprising a memory and a processor, wherein the memory stores program instructions, and when the processor runs the program instructions, the steps of any one of the methods described in the first aspect are executed.

[0022] In a fourth aspect, an embodiment of the present application provides a computer program product, which includes a computer program / instructions, and when the computer program / instructions are executed by a processor, the steps of the method described in any one of the first aspects of the claims are implemented.

[0023] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer program instructions are stored in the computer-readable storage medium, and when the computer program instructions are read and executed by a processor, the steps in any of the above-mentioned implementation methods are executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A flow chart of a modeling method for a reflective homogenizing integrator mirror provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the basic optical structure provided in the embodiment of the present application;

[0027] Figure 3 A schematic diagram of the construction of a reflective surface provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of the optical path provided in the embodiment of the present application;

[0029] Figure 5 A schematic diagram of reference line construction provided in an embodiment of the present application;

[0030] Figure 6 A schematic diagram of the construction of a cylinder provided in an embodiment of the present application;

[0031] Figure 7 Another reference line construction schematic diagram provided in an embodiment of the present application;

[0032] Figure 8 A flow chart of cylinder cutting provided for an embodiment of the present application;

[0033] Fig. 9A schematic diagram of a triangle construction provided in an embodiment of the present application;

[0034] Fig.10 A schematic diagram of arc construction provided in an embodiment of the present application;

[0035] Fig.11 A flowchart of arc construction provided in an embodiment of the present application;

[0036] Fig.12 An example diagram of target plane construction provided in an embodiment of the present application;

[0037] Fig.13 An example diagram of arc construction provided in an embodiment of the present application;

[0038] Fig.14 A schematic diagram of a reflective homogenizing integrator provided in an embodiment of the present application;

[0039] Fig.15 An example diagram of the use of a reflective homogenizing integrator provided in an embodiment of the present application;

[0040] Fig.16 An imaging effect diagram provided by an embodiment of the present application;

[0041] Fig.17 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram may represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box may also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they may sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of boxes in the block diagram and / or the flowchart, can be implemented by a dedicated hardware-based system that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0043] In the field of laser processing, especially in applications such as fiber-optic broadband laser cladding and laser surface treatment, in order to ensure the consistency of the processing surface and depth, the energy distribution of the laser beam usually needs to be shaped to achieve a flat-top distribution. This is because the uniform distribution of laser power can ensure the stability and accuracy of the processing process, reduce surface defects and non-uniformity of the heat-affected zone, and improve the overall processing effect.

[0044] Metal mirrors, especially metal integrator mirrors, show significant advantages when withstanding high-power lasers due to their excellent thermal conductivity and water cooling capabilities. Especially at a smaller aperture, metal mirrors can effectively control the divergence of the light beam and withstand the high-power output of the laser, which has advantages that other materials cannot match. As a kind of homogenizing and shaping mirror among metal mirrors, metal integrator mirrors can achieve flattening of the light spot by optimizing the optical design, thereby achieving uniform energy distribution of the laser beam. Metal mirrors are widely used in high-precision laser processing, which is of great significance for improving processing quality and stability.

[0045] However, existing metal integrator mirror designs usually rely on light field mapping technology, which uses algorithmic iteration to optimize mirror parameters to meet specific optical requirements. Specifically, the design process is based on the known incident light field, combined with the required outgoing light field, and uses an iterative algorithm to continuously adjust the mirror curvature to ultimately obtain an integrator mirror surface that meets the requirements. Although this method is theoretically feasible, it faces many problems in actual operation.

[0046] First, the design method based on light field mapping often encounters the situation that the algorithm converges slowly or cannot converge. This not only leads to low design efficiency, but also may affect the final homogenization effect and fail to achieve ideal spot homogenization. Therefore, in practical applications, the expected effect is often not achieved, which in turn affects the overall laser processing quality.

[0047] Secondly, the algorithm complexity of this design method is high, and it usually requires a lot of computing resources and time, which increases the difficulty and cost of the design. In order to meet the strict optical requirements, designers need to have high professional knowledge and technical background, and the hardware requirements are also increased accordingly, which greatly increases the technical threshold and the difficulty of research and development. As a result, the design and production process of metal integrator mirrors is difficult to standardize and industrialize, limiting its promotion in large-scale applications.

[0048] In addition, due to the complexity of the algorithm, it is easy to have abnormal surface features during the iterative optimization process, which may cause the final optimized mirror shape to be unable to be processed, or the processing difficulty is too great, or even impossible to process. This not only increases production costs, but may also lead to a large waste of time and resources.

[0049] Based on this, the present application proposes a reflective homogenizing integrator mirror, a modeling method thereof, and an electronic device. The modeling method of the reflective homogenizing integrator mirror avoids the complicated algorithm optimization process by determining the basic geometric parameters, constructing the reflecting surface curve segment, adjusting the reference line, constructing the cylinder, and cutting the mirror unit, thereby ensuring the uniform distribution and precise guidance of the light beam, and finally realizing the design of an efficient, stable, and industrializable reflective homogenizing integrator mirror.

[0050] Please see Figure 1 , Figure 1 A flow chart of a modeling method for a reflective homogenizing integrator provided in an embodiment of the present application; Figure 1 See on the basis of Figures 2 to 6 ; Figure 2 A schematic diagram of the basic optical structure provided in the embodiment of the present application; Figure 3 A schematic diagram of the construction of a reflective surface provided in an embodiment of the present application;

[0051] Figure 4 A schematic diagram of the optical path provided in the embodiment of the present application; Figure 5 A schematic diagram of reference line construction provided in an embodiment of the present application; Figure 6 A schematic diagram of a cylinder provided in an embodiment of the present application; The present application provides a modeling method for a reflective homogenizing integrator mirror, and the modeling method for the reflective homogenizing integrator mirror can be Fig.17 The modeling method of the reflective homogenizing integrator mirror comprises the following steps:

[0052] Step S100: basic optical structure construction step: determining geometric parameters of the basic optical structure of the reflective homogenizing integrator.

[0053] In the above step S100, the basic optical structure is first constructed to determine the set parameters of the basic optical structure of the reflective homogenizing integrator. The modeling of the reflective homogenizing integrator provides basic geometric parameters, through which the shape of the mirror, the trajectory of the reflected light beam, and the relative position between the light beam and the mirror are determined.

[0054] like Figure 2 As shown, the geometric parameters include: incident focal length F1, exit focal length F2, uniform distribution length of homogenized light spot L1, beam angle a, incident light point s1, mirror center point s2, the center point of L1 coincides with the end of F2 as s3. In addition, the angle between L1 and F2 is additionally defined according to requirements, ranging from 30° to 90°.

[0055] Incident focal length F1: defined as the distance from the light source to the center of the mirror of the incident light beam, which determines the incident angle of the light beam and the geometric relationship between the light source and the mirror.

[0056] Outgoing focal length F2: defined as the distance from the focal point of the light beam after mirror reflection, which determines the final focus of the reflected light beam.

[0057] Uniform distribution length L1 of the homogenized light spot: The length of the light spot along the L1 direction on the plane after homogenization, which reflects the size of the final homogenized light spot.

[0058] Beam angle a: The angle between the reflecting surface and the incident light beam determines the propagation path and reflection angle of the light beam.

[0059] Incident light point s1, mirror center points s2 and s3: These points determine the geometric path of beam propagation and the position and distribution of the mirror.

[0060] Step S200: Reflection surface construction step, drawing n smooth curve segments k on the plane formed by F1, F2 and L1 i , and connect n smooth curves in pairs in sequence to obtain the reflection surface.

[0061] Among them, there is a smooth line segment k v After s2, i∈[3,n], v∈[3,n], n≥3.

[0062] In the above step S200, if Figure 3 As shown, based on the geometric parameters determined in step S100, n smooth curve segments k are drawn in the plane formed by F1, F2 and L1. i And connect these curves in sequence to form a reflecting surface, ensuring that different curve segments can be used in conjunction with each other, ultimately achieving uniform distribution of the light beam.

[0063] In particular, see Figure 4 , ensuring that there is a curve segment (k v ) passes through the center point s2 of the mirror, ensuring that the reflected light can pass through the reflection intersection point of the curve segment from the incident light point s1 and is located at the focal length F2.

[0064] Step S300: a reference line construction step, in which a reference line segment L3 is drawn on the plane formed by F1, F2 and L1, parallel to L1 and at a distance DF from L1.

[0065] Among them, the length of L3 is greater than the length of L1.

[0066] In the above step S300, if Figure 5 As shown, a reference line segment L3 is drawn which is parallel to the line segment L1 and is located at the defocus amount DF of L1. In the embodiment of the present application, the position of the reference line is adjusted by calculating the defocus amount DF, thereby providing a geometric basis for the subsequent beam guidance and homogenization processing. The defocus amount DF is the deviation between the light beam and the expected focus due to the divergence angle of the light source and the geometric shape of the mirror during the mirror reflection process.

[0067] The reference line segment L3 is set to be parallel to L1, and its position deviates from L1 by a certain distance (i.e., the defocus amount DF). The length of the line segment L3 is greater than the length of L1 and is evenly distributed on the entire reflection surface. In the subsequent modeling process, by combining L3 with other geometric elements, the beam can be precisely controlled to ensure the homogenization of the light spot and the correct alignment of the focus.

[0068] Step S400: a cylinder construction step, drawing a circular plane perpendicular to F1 and passing through s2, and stretching the circular plane to obtain a cylinder.

[0069] Among them, the diameter of the circular plane is smaller than the smooth curve segment k i The length of the projection line on the plane is d i , and each projection line has 2 intersection points with the circular plane.

[0070] In the above step S400, if Figure 6 As shown, draw a circular plane ( Figure 6 After expansion, it becomes reference plane 1, which is perpendicular to F1), and stretches it into a cylinder.

[0071] Please refer to Figure 3 , smooth curve segment k i The projection lengths in the direction perpendicular to the F1 line segment correspond to the projection line lengths d i In this step, the diameter of the circular plane is set to be smaller than all smooth curve segments k i The sum of the lengths of the projection lines on the plane (d1+d2+...+d n By controlling the diameter of the cylinder, it can be ensured that all beam reflection lines have intersections with the circular plane, ensuring that the beam is correctly focused.

[0072] Step S500: a mirror cutting step, dividing the reflective surface into a plurality of mirror units, and cutting a cylinder based on the plurality of mirror units to obtain a reflective homogenizing integrator mirror.

[0073] In the above step S500, the reflective surface is divided into a plurality of small units, each of which is responsible for reflecting the light beam onto a specific path. These mirror units are precisely geometrically designed and cut so that each unit can effectively guide the light beam and achieve a homogenized light spot. Finally, the modeling of the reflective homogenizing integrator is completed through the cutting of the cylinder and the combination of the mirror units.

[0074] pass Figures 1 to 6It can be seen that the modeling method of the reflective homogenizing integrator provided in the embodiment of the present application avoids the complex algorithm optimization process by determining the basic geometric parameters, constructing the reflective surface curve segment, adjusting the reference line, constructing the cylinder and cutting the mirror unit, ensuring the uniform distribution and precise guidance of the light beam, and finally realizing the efficient, stable and industrializable design of the reflective homogenizing integrator. Compared with the traditional algorithm optimization design based on light field mapping, the modeling method of the reflective homogenizing integrator provided in the embodiment of the present application has higher design efficiency, lower computational complexity and stronger manufacturability, and is suitable for large-scale production and application.

[0075] Please Figure 5 See on the basis of Figure 7 , Figure 7 Another reference line construction schematic diagram provided in the embodiment of the present application; in an optional implementation scheme of the embodiment of the present application, in the above reference line construction step, the calculation formula of the defocus amount DF is:

[0076]

[0077] Among them, L2 is the non-uniform distribution length, which determines the spatial range of the homogenized light spot. b is the divergence half angle of the point divergence light source, which affects the divergence degree of the light beam; the larger the divergence angle, the stronger the divergence degree of the light beam.

[0078] On the plane formed by F1, F2 and L1, a reference line segment L3 is drawn parallel to L1 and at a distance DF from L1, including:

[0079] exist In this case, the center point of L3 is located on the F2 line segment ( Figure 5 In this case, the center point of L3 is located on the line segment F2, which means that the distance between the reference lines L3 and L1 is based on a relatively compact setting, which is suitable for accurate homogenization of the light beam.

[0080] Or, in In this case, the center point of L3 is located on the extension line of F2 segment ( Figure 7 At this time, the center point of the reference line L3 is located on the extension line of F2, indicating that the reference line is pulled away, which is suitable for larger light spots or more divergent light beams, ensuring that the final light beam can still maintain a good homogenization effect after reflection.

[0081] It can be seen that the modeling method of the reflective homogenizing integrator provided in this embodiment sets the position of the reference line L3 by the defocus amount, and can flexibly adjust the focus and distribution of the light beam under different light sources and homogenization requirements, thereby ensuring an efficient light spot homogenization effect, and can realize a high-performance and mass-producible reflective homogenizing integrator to meet various application requirements.

[0082] In an optional embodiment, in the step of constructing the reflecting surface (step S200), the smooth curve segment includes a circular arc segment, a parabola segment or an ellipse segment.

[0083] Among them, the arc segment is a curve with constant curvature, which can smoothly guide the direction of the incident light beam to the predetermined exit direction. The arc has simpler geometric characteristics, is easy to calculate, and is suitable for scenes requiring lower homogenization accuracy. The application of arc curves can usually provide a smoother reflected light beam distribution and can effectively reduce the beam deviation caused by complex curvature changes.

[0084] A parabola is a curve with non-constant curvature that can reflect parallel light rays to a specific focus through its focus. Parabola segments are often used in designs for more precise beam focusing or homogenization. Due to its focal properties, a parabola can better focus the incident beam and improve the uniformity of the reflected beam, especially for applications with large beam divergence angles or where a high degree of homogenization is required.

[0085] An ellipse is similar to a parabola and is also a curve with non-constant curvature. The two foci and reflection properties of an ellipse make it a good choice, especially when the design requires controlling the uniformity of the reflected beam at different angles. The geometric properties of the ellipse make it extremely efficient in homogenizing the distribution of the light spot, and can better control the reflection direction of the beam and maintain the homogenization effect.

[0086] It can be seen that arc segments are suitable for simpler designs, while parabolic segments and elliptical segments can provide better beam control under more complex homogenization requirements. In the face of different needs, different types of curve segments can be selected for use. The modeling methods provided in the embodiments of this application can achieve high-precision and high-efficiency beam homogenization effects, meet the needs of various industrial and scientific research applications, and maintain low design complexity and high industrial realization capabilities.

[0087] Please continue to see Figure 4 In the above reflection surface construction step (step S200), the starting point of k1 is t1, k n-1 With k n The intersection point is t n , k n The end point is t n+1 .

[0088] F1 is respectively related to the above t1 to t n+1 The line connecting any two adjacent points in the image is reflected by the corresponding smooth curve segment, and the reflected lines cross and pass through the two endpoints of L1 respectively.

[0089] F1 and k v The corresponding t v and tv-1 The connection of k v After reflection, the reflected lines cross and the intersection point is on F2.

[0090] In the above implementation process, the incident light source F1 is required to be reflected by the line connecting every two adjacent intersection points of the curve segment (such as t1 and t2, t2 and t3, etc.). For each pair of adjacent points, after the light beam is reflected by the corresponding curve segment, the reflected light rays will intersect, and the intersection points pass through the two end points of L1 respectively. In particular, the design requires that F1 and the curve segment k v The intersection point on v and t v-1 After the connection line is reflected, the intersection point will be precisely located at the exit focal length F2, thereby ensuring that the light beam can be reflected on the reflection surface according to the expected path, thereby ensuring that the direction and distribution of the exiting light beam meet the requirements of the homogenized light spot.

[0091] It can be seen that the modeling method provided in the embodiment of the present application, through geometric design, accurately controls the intersection of each smooth curve segment and the incident light, effectively manages the distribution of the reflected light on the focal plane, and achieves ideal spot uniformity. It effectively overcomes the problems of slow convergence and high computational complexity in the traditional algorithm optimization design process, thereby making the design of the reflective homogenizing integrator more efficient and easier to realize industrial production.

[0092] Please see Figure 8 , Figure 8 Flow chart of cylinder cutting provided for the embodiment of the present application; please refer to Figure 8 Based on the reference Fig. 9 and Fig.10 , Fig. 9 A schematic diagram of a triangle construction provided in an embodiment of the present application; Fig.10 A schematic diagram of arc construction provided in the embodiment of the present application; in an optional implementation of the embodiment of the present application, in the above-mentioned reflection surface construction step (step S200), the intersection point of the reflection line corresponding to the smooth curve segment is m i (See also Figure 4 ); In the above reference line construction step (step S300), L3 is divided into i equal parts to obtain i+1 interval points on L3 (combined with reference to Figure 5 and Figure 7 ).

[0093] In the above-mentioned mirror surface cutting step (step S500), the reflecting surface is divided into a plurality of mirror surface units, and the cylinder is cut based on the plurality of mirror surface units, which can be achieved by the following steps:

[0094] Step S510: On the plane formed by F1, F2 and L1, select a k i To extend.

[0095] Step S520: sequentially connect the i+1 interval points to the m i Connect and extend, and with k i The extended lines intersect with each other to obtain i+1 target intersection points.

[0096] Step S530: Connect i+1 target intersection points, i+1 interval points and s1 to obtain i+1 triangles.

[0097] In the above steps S510 to S530, if Fig. 9 As shown in the figure, i+1 triangles are constructed using i+1 target intersection points and i+1 interval points. The vertices of the triangles are: target intersection point, interval point and incident light point s1. The construction of triangles is based on geometric rules, and the spatial relationship between the reflection point and the incident point is used to constrain the shape of the mirror unit. Through the construction of triangles, the area of ​​each cutting unit can be accurately defined in mirror cutting.

[0098] Step S540: Based on i+1 triangles, obtain i+1 arc graphics.

[0099] Step S550: Use arc closed figures to cut out mirror units, and cut the cylinder based on multiple mirror units.

[0100] In the above steps S540 to S550, if Fig.10 As shown, based on the i+1 triangles constructed above, i+1 arc graphics are drawn; the reflective surface is then lofted and cut using the arc closed graphics to achieve the shape of the mirror unit. The lofting and cutting technology is to perform three-dimensional modeling on the generated arc graphics, and finally obtain multiple accurate mirror units.

[0101] Similarly, the same operation is performed on other curve segments to realize the generation of mirror unit cutouts at corresponding positions of the cylinder. An intersection curve will be formed between adjacent mirror units generated by cutouts, and the generation of mirror segmentation is completed.

[0102] It can be seen that the modeling method provided in the embodiment of the present application successfully divides the reflective surface into multiple mirror units through precise geometric design and cutting methods. The shape and optical properties of each mirror unit are strictly controlled throughout the design process, ensuring the stability of the homogenization effect and being able to be smoothly generated during the processing process. The modeling method provided in the embodiment of the present application avoids the design complexity and high algorithm complexity in the traditional method, simplifies the design process, lowers the design threshold, and improves the operability of industrial production.

[0103] Please see Fig.11 , Fig.11 Flow chart of arc construction provided in the embodiment of this application; please Fig.11 See on the basis of Fig.12 and Fig.13 , Fig.12 An example diagram of target plane construction provided in an embodiment of the present application; Fig.13 An example diagram of arc construction provided in an embodiment of the present application; in an optional embodiment, the above step S540 obtains i+1 arc graphics based on i+1 triangles, which can be implemented by the following steps:

[0104] Step S541: Establish i+1 target planes, wherein each target plane passes through the target intersection point and is perpendicular to the opposite side of the target intersection point of the corresponding triangle.

[0105] In the above step S541, i+1 target planes are established through the target intersection of each triangle and the direction perpendicular to the opposite side of the corresponding triangle. Each target plane passes through the target intersection and intersects with the perpendicular line of the opposite side of the triangle, such as Fig.12 The red target plane in is one of the i+1 target planes.

[0106] Step S542: Draw i+1 target arcs with the intersection of the target plane, the corresponding interval point and the connecting line segment of s1 as the center.

[0107] Step S543: Connect each target arc with the corresponding k i The intersection of , obtain i+1 arc images.

[0108] In the above steps S542 to S543, if Fig.13 As shown, for each of the above triangles, a plane is constructed ( Fig.13 is the reference plane 2), which passes through k i The corresponding intersection point on the curve segment is perpendicular to the line connecting the corresponding interval point and the F1 light entry point s1 on the opposite side of the intersection point; on the plane, draw an arc with the intersection point of the plane, the interval point and the F1 light entry point s1 as the center, and the arc passes through k i The corresponding intersection points on the curve segment, connecting the two end points of the arc to form a closed arc graph, and so on. i The curve segments form a total of i+1 arc closed graphs, and these i+1 arc closed graphs are cut out by lofting, that is, the mirror unit cutout generation at the corresponding position of the cylinder is realized (such as Fig.10 As shown in the figure), an intersection curve will be formed between the mirror units generated by adjacent cutting, and the mirror segmentation generation is completed.

[0109] It can be seen that the modeling method provided in the embodiment of the present application obtains i+1 arc figures based on i+1 triangles, and the i+1 arc closed figure is cut out by lofting, that is, the mirror unit cutout generation at the corresponding position of the cylinder is realized. The embodiment of the present application uses 3D model for processing, which is simpler and more practical than the processing method driven by the algorithm, and also reduces the difficulty of the processing personnel in compiling the algorithm program before the lens processing, and improves the processing operability.

[0110] In an optional implementation of the embodiment of the present application, the projection line length d is adjusted i and / or L3 to adjust the rectangular flat-top spot energy distribution in the focal plane of the reflective homogenizing integrator.

[0111] Projection line d i , is the projection length of each curve segment on the reference plane. By adjusting the length of these projection lines, the propagation path of the reflected light beam and the energy distribution on the focal plane can be affected.

[0112] A shorter projection line will make the beam more concentrated on the focal plane, while a longer projection line will make the spot wider and more evenly distributed. During the design process, by precisely adjusting the length of the projection line, the geometry of the reflector can be optimized, thereby improving the uniformity of the spot and the stability of the beam intensity.

[0113] The reference line segment L3 is a reference line segment parallel to the incident light beam and used to guide the light beam. In the embodiment of the present application, adjusting the length of the reference line segment L3, especially the length change related to the defocus amount DF, can affect the angle and shape of each mirror unit on the reflection surface, thereby adjusting the distribution of the light spot on the focal plane. By changing the position and length of L3, the edge transition of the light spot can be optimized to ensure the uniformity of the light spot on the focal plane and the rectangular flat top effect.

[0114] It can be seen that by adjusting the projection line length di and / or the reference line segment L3, the energy distribution of the light spot on the focal plane of the reflective homogenizing integrator can be accurately controlled. Compared with the traditional design method, the modeling method of the reflective homogenizing integrator provided in the embodiment of the present application adopts 3D modeling software modeling mode optimization iteration, which is simpler and more practical than the traditional algorithm optimization iterative design, greatly reduces the design threshold and hardware requirements of R&D personnel, and is easier to industrialize.

[0115] Please see Fig.14 , Fig.14 Schematic diagram of a reflective homogenizing integrator provided in an embodiment of the present application; an embodiment of the present application provides a reflective homogenizing integrator 100, which is obtained by the above-mentioned reflective homogenizing integrator modeling method.

[0116] The integrator mirror uses a point divergent light source (such as a fiber output laser) as the light source. The light beam incident on the mirror surface usually has a non-uniform energy distribution, and the typical distribution form is Gaussian or quasi-Gaussian distribution. In order to achieve a uniform light spot, the integrator mirror adopts a reflective design, and the base material is a metal material that is easy to process and shape, such as oxygen-free copper or high-quality aluminum alloy. These metal materials have excellent light reflection properties, and there is a water cooling channel inside, which helps to improve the heat dissipation efficiency of the system.

[0117] The central axis angle a between the incident light beam and the reflected light beam of the reflective integrator mirror ranges from 30° to 150°. The reflection area of ​​the mirror is composed of n broadband curved surfaces (n≥3), and every two adjacent curved surfaces meet to form a curve.

[0118] Each broadband curved surface can split the incident light beam and reflect it to the focal plane to form a rectangular light spot, and ensure that the rectangular light spots formed by each curved surface are completely consistent in length, width and direction. By superimposing these light spots, a unidirectional uniformly distributed rectangular flat-top light spot is finally achieved on the focal plane.

[0119] The reflective homogenizing integrator provided in the embodiment of the present application is particularly suitable for beam shaping under point divergent light sources. Compared with ordinary integrators, it reduces the number of lenses, reduces costs and is more stable. Especially in high-power light source applications, it can provide more stable and efficient optical performance, and the design and manufacturing process have high industrial operability.

[0120] Please see Fig.15 , Fig.15 An example diagram of the use of a reflective homogenizing integrator provided in an embodiment of the present application; Fig.15 In the embodiment, taking the optical fiber output laser as an example, the reflective integrator provided in the embodiment of the present application is adopted, and the optical fiber core diameter of the optical fiber output laser is 400um, NA=0.22, the designed incident focal length F1 is 100mm, the beam deflection angle a=90°, the output focal length F2 is 300mm, and the rectangular flat-top spot size in the focal plane is 5mm x 2mm.

[0121] Optical transmission: The optical fiber laser emits a divergent light beam, which is reflected, shaped and focused by the reflective integrator 100 provided in the embodiment of the present application, and a rectangular flat-top light spot of a specified size is obtained on the focal plane. Taking the above parameters as an example, the energy distribution of the rectangular flat-top light spot on the focal plane is as follows: Fig.16 As shown, Fig.16 This is an imaging effect diagram provided by the embodiment of the present application. Fig.16 It can be seen from the results in that the use of the reflective homogenizing integrator provided in the embodiment of the present application can realize a rectangular flat-top light spot with a unidirectional homogenizing distribution on the focal plane.

[0122] See also Fig.17 , Fig.17The electronic device 200 provided in the embodiment of the present application includes: a processor 201 and a memory 202, wherein the memory 202 stores machine-readable instructions executable by the processor 201, and when the machine-readable instructions are executed by the processor 201, the above method is executed.

[0123] Based on the same inventive concept, an embodiment of the present application also provides a computer program product, which includes a computer program / instruction, and when the computer program / instruction is executed by a processor, it implements the steps in any implementation method of the above-mentioned modeling method of the reflective homogenizing integrator.

[0124] Based on the same inventive concept, an embodiment of the present application also provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are read and executed by a processor, the steps in any implementation method of the above-mentioned modeling method of the reflective homogenizing integrator are executed.

[0125] The computer-readable storage medium may be a random access memory (RAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or any other medium that can store program code.

[0126] In this article, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0127] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A modeling method for a reflective homogenizing integrator, characterized in that: The modeling method comprises: Basic optical structure construction step: determining the geometric parameters of the basic optical structure of the reflective homogenizing integrator; wherein the geometric parameters include: incident focal length F1, exit focal length F2, uniform distribution length L1 of the homogenized light spot, beam angle a, incident light point s1, mirror center point s2, the center point of L1 coincides with the end of F2 as s3; Steps for constructing the reflection surface: Draw n smooth curve segments k on the plane formed by F1, F2 and L1 i , and connect the n smooth curves in order to obtain a reflection surface; among them, there is a smooth line segment k v After s2, i∈[3,n], v∈[3,n], n≥3; Reference line construction steps: draw a reference line segment L3 on the plane formed by F1, F2 and L1, parallel to L1 and at a distance DF from L1; wherein the length of L3 is greater than the length of L1; Cylinder construction step: draw a circular plane perpendicular to F1 and passing through s2, and stretch the circular plane to obtain a cylinder; wherein the diameter of the circular plane is smaller than the smooth curve segment k i The length of the projection line on the plane is d i , and each of the projection lines has two intersection points with the circular plane; Mirror cutting step: dividing the reflecting surface into a plurality of mirror units, and cutting the cylinder based on the plurality of mirror units to obtain the reflective homogenizing integrator.

2. The modeling method according to claim 1, characterized in that: In the above reference line construction step, the calculation formula of the defocus amount DF is: Wherein, L2 is the non-uniform distribution length, b is the divergence half angle of the point divergent light source; The reference line segment L3 is drawn on the plane formed by F1, F2 and L1, parallel to L1 and at a distance DF from L1, including: exist In the case of , the center point of L3 is located on the F2 line segment; exist In this case, the center point of L3 is located on the extension line of segment F2.

3. The modeling method according to claim 1, characterized in that: In the step of constructing the reflecting surface, the smooth curve segment includes an arc segment, a parabola segment or an ellipse segment.

4. The modeling method according to claim 1, characterized in that: In the above reflection surface construction step, the starting point of k1 is t1, k n-1 With k n The intersection point is t n , k n The end point is t n+1 ; F1 is respectively related to the above t1 to t n+1 The line connecting any two adjacent points in the image is reflected by the corresponding smooth curve segment, and the reflected lines cross and pass through the two endpoints of L1 respectively; F1 and k v The corresponding t v and t v-1 The connection of k v After reflection, the reflected lines cross and the intersection point is on F2.

5. The modeling method according to claim 4, characterized in that: In the above reflection surface construction step, the intersection point of the reflection line corresponding to the smooth curve segment is m i ; In the above reference line construction step, L3 is divided into i equal parts to obtain i+1 interval points on L3; In the mirror surface cutting step, dividing the reflective surface into a plurality of mirror surface units, and cutting the cylinder based on the plurality of mirror surface units comprises: On the plane formed by F1, F2 and L1, take any k i To extend; The i+1 interval points are sequentially connected with m i Connect and extend, and with the k i Intersect with the extended line of to obtain i+1 target intersection points; Connect the i+1 target intersection points, the i+1 interval points and s1 to obtain i+1 triangles; Based on the i+1 triangles, i+1 arc graphics are obtained; The mirror unit is obtained by lofting and cutting using the arc closed figure, and the cylinder is cut based on a plurality of the mirror units.

6. The modeling method according to claim 5, characterized in that: The step of obtaining i+1 arc graphics based on the i+1 triangles includes: Establish i+1 target planes; wherein each of the target planes passes through the target intersection point and is perpendicular to the opposite side of the target intersection point of the corresponding triangle; Draw i+1 target arcs with the intersection of the target plane and the corresponding connecting line segment of the interval point and s1 as the center; Respectively connect each of the target arcs with the corresponding k i The intersection points of the arcs are obtained by i+1 arc images.

7. The modeling method according to any one of claim 1, characterized in that: Adjust the projection line length d i and / or L3, so as to adjust the energy distribution of the rectangular flat-top spot in the focal plane of the reflective homogenizing integrator.

8. A reflective homogenizing integrator, characterized in that: The reflective homogenizing integrator mirror is obtained by the modeling method of the reflective homogenizing integrator mirror according to any one of claims 1 to 7; The reflective homogenizing integrator mirror comprises a mirror surface having at least three bandwidth curved surfaces; The reflective homogenizing integrator mirror substrate material comprises a metal material having a high reflective property to incident light.

9. An electronic device, characterized in that: The electronic device comprises a memory and a processor, wherein the memory stores program instructions, and when the processor runs the program instructions, the steps in the method according to any one of claims 1 to 7 are executed.

10. A computer program product, characterized in that The computer program product comprises a computer program / instruction, which implements the steps of the method according to any one of claims 1 to 7 when executed by a processor.

Images