A laser beam dynamic beam splitting method, system, device and storage medium

Abstract

The application relates to a laser beam dynamic beam splitting method, system, device and storage medium, and belongs to the technical field of laser processing. In the method, a beam splitting phase is obtained by phase modulation, and a phase hologram is generated based on the beam splitting phase, so that the output beam of a laser is split to generate a multi-beam array; in the process of modulating the multi-beam array, the beam splitting phase meeting the number and position distribution is obtained through cyclic iteration, and a weight function is used to control the energy distribution of each beam in the multi-beam array, so that the number, position and energy distribution of the generated multi-beam array are adjustable, the dynamic real-time control can be realized according to actual needs without the aid of a complex beam splitting mirror group, and the application has wide application applicability.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser processing, and in particular relates to a laser beam dynamic splitting method, system, equipment and storage medium. Background Art

[0002] Laser technology is a technology that uses high-energy-density laser beams to process materials. It is widely used in manufacturing, medical treatment, scientific research and other fields. Laser beam shaping is an important part of laser technology, which is used to control the shape, quantity and energy distribution of laser beams to meet different application requirements. Figure 1 As shown, existing laser beam splitting and shaping technology is achieved by combining a shaping lens group with a beam splitting lens group. The incident light velocity is first shaped by the shaping lens group, and then the beam is split by the beam splitting lens group. However, this solution is complex to install and adjust the lenses, requiring multiple lens groups to coordinate and debug, resulting in difficulty in debugging and difficulty in ensuring spacing accuracy. In addition, due to the use of a complex lens combination, the spacing of the split beams cannot be adjusted in real time, resulting in a single beam spacing and energy distribution, which is difficult to meet the needs of some applications that require dynamic control. Therefore, there is a need for a method, system, device and storage medium for dynamic laser beam splitting. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a method, system, device and storage medium for dynamic laser beam splitting. The technical problems to be solved by the present invention are achieved through the following technical solutions:

[0004] The present invention provides a laser beam dynamic splitting method, comprising:

[0005] Step 1: obtaining a laser actual amplitude function according to the laser output beam mode, and obtaining a first incident beam complex amplitude function according to the laser actual amplitude function;

[0006] Step 2: performing a positive Fourier transform on the complex amplitude function of the first incident light beam to obtain a first focal plane complex amplitude function, wherein the actual amplitude function of the laser is subjected to a positive Fourier transform to obtain an actual focal plane amplitude function;

[0007] Step 3: establishing a light intensity error index function based on the focal plane actual amplitude function and determining the light intensity error index; when the function value of the light intensity error index function is less than the light intensity error index, sequentially executing step 4; when the function value of the light intensity error index function is greater than or equal to the light intensity error index, jumping to step 7;

[0008] Step 4: Obtain a focal plane target beam amplitude function according to the required light intensity and position distribution of the multi-beam array, and use the focal plane target beam amplitude function and the weight function to replace the focal plane actual amplitude function to obtain a second focal plane complex amplitude function;

[0009] Step 5: performing an inverse Fourier transform on the second focal plane complex amplitude function to obtain a second incident light beam complex amplitude function;

[0010] Step 6: Using the actual laser amplitude function to replace the focal plane target beam amplitude function and the weight function after inverse Fourier transformation in the second incident beam complex amplitude function, obtain a third incident beam complex amplitude function to replace the first incident beam complex amplitude function, and jump to step 2;

[0011] Step 7: Extract the phase of the complex amplitude function of the first incident light beam to obtain a splitting phase, generate a phase hologram according to the splitting phase, and split the laser output beam according to the phase hologram to obtain a multi-beam array.

[0012] In one embodiment of the present invention, the expression of the amplitude function A of the first incident light beam is:

[0013] A=A(x,y)*exp(i*phase2);

[0014] Where A is the complex amplitude function of the first incident light beam; A(x,y) is the actual amplitude function of the laser; x is the abscissa of the coordinate system on the object plane; y is the ordinate of the coordinate system on the object plane; exp is the exponential function with the natural constant e as the base; i is an imaginary number; and phase2 is the phase of the incident light beam.

[0015] In one embodiment of the present invention, the expression of the first focal plane complex amplitude function B is:

[0016] B=B(x1,y1)*exp(i*phase1);

[0017] Wherein, B is the complex amplitude function of the first focal plane; B(x1,y1) is the actual amplitude function of the focal plane; x1 is the abscissa of the coordinate system on the focal plane; y1 is the ordinate of the coordinate system on the focal plane; phase1 is the phase of the light beam on the focal plane.

[0018] In one embodiment of the present invention, the light intensity error index β is obtained through experiments based on the consistency requirements of actual processing;

[0019] The expression of the light intensity error index function is:

[0020]

[0021] Among them, max is the maximum value function; min is the minimum value function.

[0022] In one embodiment of the present invention, the expression of the second focal plane complex amplitude function B1 is:

[0023] B1=B design (x1,y1)*ω(x1,y1)*exp(i*phase1);

[0024] B1 is the second focal plane complex amplitude function; B design (x1,y1) is the focal plane target beam amplitude function; ω(x1,y1) is the weight function, and its expression is:

[0025]

[0026] The weight function ω(x1,y1) is used to enhance the amplitude of the focal plane actual amplitude function B(x1,y1) which is lower than the focal plane target beam amplitude function B design (x1,y1), and weaken the amplitude of the focal plane actual amplitude function B(x1,y1) which is lower than the focal plane target beam amplitude function B design (x1,y1).

[0027] In an embodiment of the present application, the expression of the second incident beam complex amplitude function A1 is:

[0028] A1=A1(x,y)*exp(i*phase2);

[0029] Wherein, A1 is the second incident beam complex amplitude function; A1(x,y) is the focal plane target beam amplitude function B design (x1,y1) and the amplitude function obtained by inverse Fourier transform of the weight function ω(x1,y1).

[0030] In an embodiment of the present application, the expression of the third incident beam complex amplitude function A2 is:

[0031] A2=A(x,y)*exp(i*phase2);

[0032] Wherein, A2 is the third incident beam complex amplitude function.

[0033] In an embodiment of the present application, the step 7 further comprises:

[0034] Step 8: generating a shaping phase according to the required beam shape and size, adding the shaping phase and the beam splitting phase to obtain a beam splitting shaping phase, generating a phase hologram according to the beam splitting shaping phase, and splitting and shaping the laser output beam according to the phase hologram to obtain a multi-beam shaping array; wherein the beam splitting phase is used to control the number and position of beams; the shaping phase is used to control the shape and size of the beams.

[0035] The present invention also provides a laser beam dynamic splitting system, comprising: an output beam mode acquisition module, a focal plane transformation module, a light intensity error judgment module, a target beam balance module, an object plane transformation module, an actual amplitude function conversion module, a beam splitting phase acquisition module, a shaping phase acquisition module and a beam array generation module; wherein,

[0036] The output beam mode acquisition module is used to acquire the actual amplitude function of the laser according to the output beam mode of the laser, and obtain the complex amplitude function of the first incident light beam according to the actual amplitude function of the laser;

[0037] The focal plane transformation module is configured to perform a positive Fourier transform on the complex amplitude function of the first incident light beam to obtain a first focal plane complex amplitude function, wherein the actual amplitude function of the laser is subjected to a positive Fourier transform to obtain an actual focal plane amplitude function;

[0038] The light intensity error judgment module is used to establish a light intensity error index function according to the actual amplitude function of the focal plane and determine the light intensity error index;

[0039] The target beam balancing module is used to obtain a focal plane target beam amplitude function according to the required light intensity and position distribution of the multi-beam array, and use the focal plane target beam amplitude function and a weight function to replace the focal plane actual amplitude function to obtain a second focal plane complex amplitude function;

[0040] The object plane transformation module is configured to perform an inverse Fourier transform on the second focal plane complex amplitude function to obtain a second incident light beam complex amplitude function;

[0041] The actual amplitude function conversion module is configured to replace the focal plane target beam amplitude function and the weight function in the second incident beam complex amplitude function after inverse Fourier transformation with the laser actual amplitude function, thereby obtaining a third incident beam complex amplitude function to replace the first incident beam complex amplitude function;

[0042] The beam splitting phase acquisition module is used to extract the phase of the complex amplitude function of the first incident light beam to obtain the beam splitting phase, generate a phase hologram based on the beam splitting phase, and split the laser output beam according to the phase hologram to obtain a multi-beam array; the beam splitting phase is used to control the number and position of the light beams;

[0043] The shaping phase acquisition module is used to obtain the shaping phase according to the required beam shape and size; the shaping phase is used to control the shape and size of the beam;

[0044] The beam array generation module is used to add the shaping phase and the beam splitting phase to obtain a beam splitting shaping phase; the beam array generation module is also used to generate a phase hologram based on the beam splitting shaping phase, and split and shape the laser output beam according to the phase hologram to obtain a multi-beam shaping array.

[0045] The present invention also provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned laser beam dynamic splitting method when executing the computer program.

[0046] The present invention also provides a computer-readable storage medium having a computer program stored thereon, and the computer program implements the above-mentioned laser beam dynamic splitting method when executed by a processor.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] The present invention obtains the splitting phase by modulating the phase, and generates a phase hologram based on the splitting phase, thereby splitting the laser output light beam to generate a multi-beam array; in the process of modulating the multi-beam array, the splitting phase that satisfies the quantity and position distribution is obtained through cyclic iteration, and the energy distribution of each beam in the multi-beam array is regulated by a weight function, so that the quantity, position and energy distribution of the generated multi-beam array are all adjustable, and dynamic real-time regulation can be performed according to actual needs without the help of a complex beam splitter group.

[0049] The present invention generates a shaping phase and a splitting phase, adds the shaping phase to the splitting phase to obtain a splitting shaping phase, generates a phase hologram based on the splitting shaping phase, and splits and shapes the laser output beam based on the phase hologram to obtain a multi-beam shaping array. By combining shaping based on phase modulation with beam splitting, the beam splitting and shaping function is achieved, and the number of split beams, spacing, and spot shaping shape can be dynamically controlled, making it widely applicable.

[0050] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a light path diagram of an existing laser beam splitting and shaping device;

[0052] Figure 2 is a flow chart of a laser beam dynamic splitting method provided by an embodiment of the present invention;

[0053] Figure 3 This is a workflow diagram of a laser beam dynamic splitting method provided by an embodiment of the present invention;

[0054] Figure 4 1 is a schematic structural diagram of a laser beam dynamic splitting system provided by an embodiment of the present invention;

[0055] Figure 5 1 is a schematic diagram of the optical path structure of a laser beam dynamic splitting system provided by an embodiment of the present invention;

[0056] Figure 6a This is a rendering of a 1*3 circular beam array provided by an embodiment of the present invention;

[0057] Figure 6b This is a rendering of a 1*3 square beam array provided by an embodiment of the present invention;

[0058] Figure 6c This is a rendering of a 3*3 circular beam array provided by an embodiment of the present invention;

[0059] Figure 6d This is a rendering of a 3*3 square beam array provided by an embodiment of the present invention;

[0060] Figure 7 It is a structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0061] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description of a laser beam dynamic splitting method, system, device and storage medium proposed in accordance with the present invention in combination with the accompanying drawings and specific implementation methods.

[0062] The aforementioned and other technical contents, features, and effects of the present invention are clearly presented in the following detailed description of the specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a deeper and more specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are provided for reference and illustration purposes only and are not intended to limit the technical solutions of the present invention.

[0063] Example 1

[0064] like Figure 1 As shown, Figure 1 This is an optical path diagram of an existing laser beam splitting and shaping device. Existing laser beam splitting and shaping technology is achieved by combining a shaping lens group with a beam splitting lens group, which is difficult to meet the application requirements of dynamic control. In view of this, this embodiment provides a laser beam dynamic splitting method.

[0065] like Figure 2 and Figure 3 As shown, Figure 2 is a flow chart of a laser beam dynamic splitting method provided by an embodiment of the present invention; Figure 3 This is a workflow diagram of a laser beam dynamic splitting method provided by an embodiment of the present invention.

[0066] The laser beam dynamic splitting method of this embodiment includes:

[0067] Step 1: Obtain the actual amplitude function of the laser according to the laser output beam mode, and obtain the complex amplitude function of the first incident light beam according to the actual amplitude function of the laser.

[0068] It can be understood that the laser output beam modes generally include: basic mode and advanced mode, and the amplitude function of each mode has its own beam expression. Since the fast Fourier transform (FFT) is performed on the entire complex amplitude function of the incident light beam in this embodiment, the difference in beam expressions does not affect the specific implementation of the method; and the beam expressions of different laser output beam modes can also be implemented by referring to relevant existing technologies, so they will not be repeated here.

[0069] Specifically, the expression of the amplitude function A of the first incident light beam is:

[0070] A=A(x,y)*exp(i*phase2) (1);

[0071] Wherein, A is the complex amplitude function of the first incident light beam; A(x,y) is the actual amplitude function of the laser; x is the abscissa of the coordinate system on the object plane; y is the ordinate of the coordinate system on the object plane; exp is the exponential function with the natural constant e as the base; i is an imaginary number; phase2 is the phase of the incident light beam, that is, the phase of the complex amplitude function A of the first incident light beam.

[0072] Furthermore, the phase phase2 of the incident beam participates in the subsequent iteration process. In the first iteration, that is, in the first incident beam amplitude function A established based on the laser output beam mode, it can take a random value, and its expression is:

[0073] phase2=rand(m,n) (2);

[0074] Among them, rand is a random number function; (m,n) is the resolution of the modulator target surface, such as 1980*1024.

[0075] Step 2: Perform a positive Fourier transform on the complex amplitude function of the first incident light beam to obtain a first focal plane complex amplitude function, wherein the actual amplitude function of the laser is subjected to a positive Fourier transform to obtain the actual amplitude function of the focal plane.

[0076] Specifically, the expression of the complex amplitude function B of the first focal plane is:

[0077] B=B(x1,y1)*exp(i*phase1) (3);

[0078] Wherein, B is the complex amplitude function of the first focal plane; B(x1,y1) is the actual amplitude function of the focal plane; x1 is the abscissa of the coordinate system on the focal plane; y1 is the ordinate of the coordinate system on the focal plane; phase1 is the phase of the light beam on the focal plane, that is, the phase of the complex amplitude function B of the first focal plane.

[0079] Step 3: Establish a light intensity error index function based on the actual amplitude function of the focal plane and determine the light intensity error index; when the function value of the light intensity error index function is less than the light intensity error index, execute step 4 sequentially; when the function value of the light intensity error index function is greater than or equal to the light intensity error index, jump to step 7.

[0080] like Figure 6a As shown, Figure 6a This is a rendering of the 1*3 circular beam array provided by an embodiment of the present invention.

[0081] For example, the light intensity error index β is obtained through experiments based on the consistency requirements of actual processing. When the experiment outputs a 1*3 circular beam array, it is required that the line width consistency when using the three beams to mark the lines is above 90%. However, the light intensity error of these three beams (indicating the consistency of the light intensity) is not necessarily 90%. Therefore, it is necessary to use a single beam of light to control the laser to output different light intensities. For example, when the function value of the light intensity error index function is within 95%, the marking consistency can be within 90%. In this case, the light intensity error index β is set to 95%.

[0082] Specifically, the physical meaning of the light intensity error index function is the difference between the strongest point and the weakest point in the actual amplitude function B(x1,y1) of the focal plane divided by the sum of the strongest point and the weakest point. Its expression is:

[0083]

[0084] Among them, max is the maximum value function; min is the minimum value function.

[0085] Furthermore, when When , it indicates that the actual amplitude function of the focal plane B(x1,y1) and the amplitude function of the target beam of the focal plane B designSince (x1, y1) are close to each other, the phase of the complex amplitude function A of the first incident light beam can be directly extracted to obtain the splitting phase. A phase hologram is generated based on the splitting phase, and the laser output beam is split according to the phase hologram to obtain a multi-beam array. In other words, the core purpose of the dynamic laser beam splitting method of this embodiment is to find the phase phase2 of the complex amplitude function A of the first incident light beam. At this phase phase2, the desired multi-beam array can be obtained at the focal plane through field lens focusing.

[0086] And when , it means that a loop iteration is required to continue searching for the phase phase2 of the complex amplitude function A of the first incident light beam and execute step 4.

[0087] Step 4: Obtain the focal plane target beam amplitude function according to the required light intensity and position distribution of the multi-beam array, and use the focal plane target beam amplitude function and the weight function to replace the focal plane actual amplitude function to obtain the second focal plane complex amplitude function.

[0088] Specifically, the expression of the second focal plane complex amplitude function B1 is:

[0089] B1=B design (x1,y1)*ω(x1,y1)*exp(i*phase1) (5);

[0090] Where B1 is the complex amplitude function of the second focal plane; B design (x1, y1) is the target beam amplitude function in the focal plane;

[0091] ω(x1,y1) is the weight function, and its expression is:

[0092]

[0093] The weight function ω(x1, y1) is used to enhance the actual amplitude function B(x1, y1) of the focal plane to be lower than the target beam amplitude function B design (x1, y1) and reduce the actual amplitude function B(x1, y1) of the focal plane to be lower than the amplitude function B of the target beam on the focal plane. design The amplitude of (x1,y1).

[0094] The principle is that the core purpose of the laser beam dynamic splitting method of this embodiment is to find the phase phase2 of the complex amplitude function A of the first incident light beam. The complex amplitude function A of the first incident light beam can obtain the target light intensity (i.e. the number of split beams and the position of each beam of light) at the focal plane after being focused by the field lens under phase phase2. The amplitude function reflects the actual light intensity. At this time, the phase phase1 of the light beam on the focal plane does not need to be processed (remains unchanged). Similarly, the actual amplitude function A(x,y) of the laser needs to be kept unchanged in the object plane. Therefore, the focal plane target beam amplitude function B is used. design (x1, y1) replaces the actual amplitude function B(x1, y1) of the focal plane, and introduces the weight function ω(x1, y1) to enhance the actual amplitude function B(x1, y1) of the focal plane to be lower than the target beam amplitude function B design (x1, y1) and reduce the actual amplitude function B(x1, y1) of the focal plane to be lower than the amplitude function B of the target beam on the focal plane. design The amplitude of (x1,y1).

[0095] like Figure 6b As shown, Figure 6b This is a rendering of the 1*3 square beam array provided by an embodiment of the present invention.

[0096] For example, when outputting a 1*3 square beam array, the focal plane target beam amplitude function B design The light intensity ratio of the three target points (x1, y1) is 1:1:1, but the light intensity ratio of the three target points of the actual focal plane actual amplitude function B(x1, y1) is 1:0.5:1. Therefore, it is necessary to multiply the middle target point by a coefficient of 2, that is, 1:2:1, through the weight function ω(x1, y1) to obtain a new focal plane complex amplitude function (the second focal plane complex amplitude function B1).

[0097] Step 5: Perform an inverse Fourier transform on the second focal plane complex amplitude function to obtain the second incident light beam complex amplitude function.

[0098] Specifically, the expression of the complex amplitude function A1 of the second incident light beam is:

[0099] A1=A1(x,y)*exp(i*phase2) (7);

[0100] Where A1 is the complex amplitude function of the second incident beam; A1(x,y) is the amplitude function B of the target beam in the focal plane design The amplitude function obtained by inverse Fourier transforming (x1, y1) and the weight function ω(x1, y1).

[0101] Step 6: Use the actual laser amplitude function to replace the focal plane target beam amplitude function and weight function after inverse Fourier transformation in the complex amplitude function of the second incident beam, obtain the third incident beam complex amplitude function to replace the first incident beam complex amplitude function, and jump to step 2.

[0102] Specifically, the actual amplitude function A(x, y) of the laser is used to replace the amplitude function A1(x, y) in the complex amplitude function A1 of the second incident light beam, while keeping the phase phase2 unchanged. The inverse Fourier transform is performed on the whole to obtain the complex amplitude function A2 of the third incident light beam, which is expressed as follows:

[0103] A2=A(x,y)*exp(i*phase2) (8);

[0104] Wherein, A2 is the complex amplitude function of the third incident light beam.

[0105] Furthermore, the obtained complex amplitude function A2 of the third incident beam is substituted into step 2, a positive Fourier transform is performed, and step 3 is sequentially performed, and the light intensity error index β is used for judgment until the actual amplitude function B(x1, y1) of the focal plane is equal to the amplitude function B(x1, y1) of the target beam on the focal plane. design (x1, y1) are close, that is, the judgment condition is met, and the phase can be extracted to obtain the beam splitting phase.

[0106] Step 7: Extract the phase of the complex amplitude function of the first incident light beam to obtain the splitting phase, generate a phase hologram based on the splitting phase, and split the laser output beam based on the phase hologram to obtain a multi-beam array.

[0107] The laser beam dynamic splitting method of the present invention obtains the splitting phase by modulating the phase, and generates a phase hologram based on the splitting phase, thereby splitting the laser output beam to generate a multi-beam array; in the process of modulating the multi-beam array, the splitting phase that satisfies the quantity and position distribution is obtained through cyclic iteration, and the energy distribution of each beam in the multi-beam array is regulated using a weight function, so that the quantity, position and energy distribution of the generated multi-beam array are all adjustable, and dynamic real-time regulation can be performed according to actual needs without the aid of a complex beam splitter group.

[0108] In an optional embodiment, step 7 further includes:

[0109] Step 8: Generate a shaping phase according to the required beam shape and size, and add the shaping phase to the beam splitting phase to obtain a beam splitting shaping phase. Generate a phase hologram based on the beam splitting shaping phase, and split and shape the laser output beam according to the phase hologram to obtain a multi-beam shaping array.

[0110] Among them, the beam splitting phase is used to control the number and position of the light beam; the shaping phase is used to control the shape and size of the light beam.

[0111] like Figures 6a to 6d As shown, Figure 6c This is a rendering of a 3*3 circular beam array provided by an embodiment of the present invention; Figure 6d This is a rendering of the 3*3 square beam array provided by an embodiment of the present invention.

[0112] For example, the expression for a circular (top hat) beam is:

[0113]

[0114] Where phase3′ is the shaping phase of the circular flat-top beam; (γ, ρ) is the coordinate point in the polar coordinate system; R is the required size of the circular flat-top beam, that is, the size of the circular flat-top beam is controlled by R; w0 is the waist radius of the incident beam; λ is the wavelength of the incident beam; and f is the focal length of the field lens.

[0115] Similarly, the expression for a square (flat-top) beam is:

[0116]

[0117] Where phase3″ is the phase of the square flat-top beam; erf is the error function in mathematics; t is the coordinate point, t = (x, y); and L is the side length of the square spot.

[0118] The beam shaping phase phase is obtained by adding the beam shaping phase phase3 for controlling the shape and size of the beam to the beam splitting phase phase2 for controlling the number and position of the beam. The expression is:

[0119] phase=phase2+phase3 (11);

[0120] Among them, phase is the beam splitting and shaping phase; phase2 is the beam splitting phase; phase3 is the shaping phase.

[0121] Then, a phase hologram is generated according to the phase of the beam splitting and shaping phase, and the phase of the laser output beam is changed according to the phase hologram to split and shape the beam. Finally, after focusing, a multi-beam shaping array is obtained. The effect diagram is as follows Figures 6a to 6d shown.

[0122] The present invention generates a shaping phase and a splitting phase, adds the shaping phase to the splitting phase to obtain a splitting shaping phase, generates a phase hologram based on the splitting shaping phase, and splits and shapes the laser output beam based on the phase hologram to form a multi-beam shaping array. By combining shaping based on phase modulation with beam splitting, the beam splitting and shaping function is achieved, and the number of split beams, spacing, and spot shaping shape can be dynamically controlled, making it widely applicable.

[0123] Example 2

[0124] like Figure 4 As shown, Figure 4 It is a structural schematic diagram of a laser beam dynamic splitting system provided by an embodiment of the present invention.

[0125] This embodiment provides a laser beam dynamic splitting system, comprising: an output beam mode acquisition module 100, a focal plane transformation module 200, a light intensity error judgment module 300, a target beam balancing module 400, an object plane transformation module 500, an actual amplitude function conversion module 600, a beam splitting phase acquisition module 700, a shaping phase acquisition module 800, and a beam array generation module 900; wherein,

[0126] The output beam mode acquisition module 100 is used to acquire the actual amplitude function of the laser according to the output beam mode of the laser, and obtain the complex amplitude function of the first incident light beam according to the actual amplitude function of the laser;

[0127] A focal plane transformation module 200 is configured to perform a positive Fourier transform on the complex amplitude function of the first incident light beam to obtain a first focal plane complex amplitude function, wherein the actual amplitude function of the laser is subjected to a positive Fourier transform to obtain the actual focal plane amplitude function;

[0128] The light intensity error judgment module 300 is used to establish a light intensity error index function according to the actual amplitude function of the focal plane and determine the light intensity error index;

[0129] The target beam balancing module 400 is used to obtain a focal plane target beam amplitude function based on the required light intensity and position distribution of the multi-beam array, and use the focal plane target beam amplitude function and the weight function to replace the focal plane actual amplitude function to obtain a second focal plane complex amplitude function;

[0130] The object plane transformation module 500 is configured to perform an inverse Fourier transform on the second focal plane complex amplitude function to obtain a second incident light beam complex amplitude function;

[0131] an actual amplitude function conversion module 600 for replacing the focal plane target beam amplitude function and the weight function obtained by inverse Fourier transformation in the complex amplitude function of the second incident beam with the actual amplitude function of the laser, thereby obtaining a third incident beam complex amplitude function to replace the first incident beam complex amplitude function;

[0132] The beam splitting phase acquisition module 700 is used to extract the phase of the complex amplitude function of the first incident light beam to obtain the beam splitting phase, generate a phase hologram based on the beam splitting phase, and split the laser output beam based on the phase hologram to obtain a multi-beam array; the beam splitting phase is used to control the number and position of the beams;

[0133] The shaping phase acquisition module 800 is used to obtain the shaping phase according to the required beam shape and size; the shaping phase is used to control the shape and size of the beam;

[0134] The beam array generation module 900 is used to add the shaping phase and the splitting phase to obtain the splitting shaping phase; the beam array generation module is also used to generate a phase hologram based on the splitting shaping phase, and split and shape the laser output beam based on the phase hologram to obtain a multi-beam shaping array.

[0135] It is worth noting that by generating the shaping phase and the beam-splitting phase, a multi-beam shaping array is obtained, which does not require the adjustment of complex beam splitting mirror groups or shaping mirror groups, thereby realizing dynamic control of beam splitting and shaping, and has wide application applicability.

[0136] For example, the optical path structure of the laser beam dynamic splitting system of this embodiment is as follows: Figure 5 As shown, Figure 5 This is a schematic diagram of the optical path structure of a laser beam dynamic splitting system provided by an embodiment of the present invention.

[0137] The optical path structure of the laser beam dynamic splitting system of this embodiment includes: a laser 1, a beam expander 2, a half-wave plate 3, a polarization beam splitter prism 4, a beam modulation module 8, a beam scanning system 9 and a focusing system 10;

[0138] Among them, the laser 1 is used to output a light beam; the beam expander 2 is arranged behind the laser 1, and is used to expand the diameter of the incident light beam; the half-wave plate 3 is arranged behind the beam expander 2, and is used to improve the polarization ratio of the horizontally polarized light in the incident light beam; the polarization beam splitter prism 4 is arranged behind the half-wave plate 3, and is used to filter out the vertically polarized light in the incident light beam to obtain a horizontally polarized light beam; the light beam modulation module 8 is arranged behind the polarization beam splitter prism 4, and is used to adopt the laser beam dynamic splitting method of embodiment 1 to phase modulate the horizontally polarized light beam to obtain a modulated multi-beam array; the light beam scanning system 9 is arranged behind the light beam modulation module 8, and is used to reflect and deflect the modulated multi-beam array so that the light beam enters the focusing system 10; the focusing system 10 is arranged behind the light beam scanning system 9, and is used to focus the output light beam onto the focal plane 11.

[0139] Exemplarily, the beam scanning system 9 is used to control the beam scanning trajectory, and the focusing system 10 is used for focus shaping.

[0140] Exemplarily, the beam scanning system 9 includes a scanning head, a galvanometer, or a reflective mirror.

[0141] Illustratively, the focusing system 10 includes a lens, a telecentric field lens, or an objective lens.

[0142] In this embodiment, the light beam modulation module 8 includes: a liquid crystal light valve 5, a liquid crystal light valve drive control board 6 and a computer 7; wherein the liquid crystal light valve 5, the liquid crystal light valve drive control board 6 and the computer 7 are arranged in sequence; the computer 7 is used to adopt the laser beam dynamic splitting method of embodiment 1 to obtain the splitting phase and generate a phase hologram based on the splitting phase; the liquid crystal light valve drive control board 6 is used to display the phase hologram on the liquid crystal light valve 5 to form a phase diagram; the liquid crystal light valve 5 is arranged behind the polarization splitting prism 4 and is used to phase modulate the horizontally polarized light beam through the phase diagram to obtain a multi-beam array.

[0143] Its working principle is that the laser 1 generates laser light and passes through the beam expander 2, and then the polarization ratio is adjusted by the half-wave plate 3 so that the horizontal polarized light (P light) in the laser beam accounts for the highest proportion, and the vertical polarized light (S light) is filtered out by the polarization beam splitter prism 4, so that the horizontally polarized light beam enters the beam modulation module 8. In the beam modulation module 8, the laser beam dynamic splitting method in Example 1 is run based on the computer 7 to generate a beam shaping phase hologram, and the beam shaping phase hologram is displayed on the liquid crystal light valve 5 through the liquid crystal light valve drive control board 6, forming a phase diagram on the liquid crystal light valve 5. When the laser beam is irradiated on the phase diagram displayed on the liquid crystal light valve 5, a phase delay is generated to achieve shaping and beam splitting. Finally, the beam after shaping and beam splitting passes through the beam scanning system 9 and the focusing system 10 in sequence, forming a multi-beam shaping array on the focal plane 11, as shown in FIG. Figures 6a to 6d shown.

[0144] Depend on Figures 6a to 6d , it can be seen that it can achieve better beam splitting and shaping effects.

[0145] It's worth noting that there's no need to first shape the incident beam using a shaping lens assembly and then split the incident laser beam using a beamsplitter assembly. Instead, the phase pattern on the liquid crystal light valve 5 performs both beam splitting and shaping, eliminating the need for multiple sets of functional lenses for coordinated adjustment. Simultaneously, phase adjustment allows for adjustments to the beam's spatial position, number of splits, shape, and energy distribution, meeting the demands of dynamic control. In other words, beam modulation module 8 generates a phase hologram by modulating the beam, eliminating the need for a lens assembly for phase modulation. Simply adjusting the phase hologram is sufficient to meet control requirements.

[0146] Example 3

[0147] This embodiment provides an electronic device 01, including: a processor 011, a memory 012, and a computer program stored in the memory 012 and executable on the processor 011. When the processor 011 executes the computer program, the laser beam dynamic splitting method of the first embodiment is implemented.

[0148] like Figure 7 As shown, Figure 7 It is a structural diagram of an electronic device provided by an embodiment of the present invention.

[0149] For example, electronic device 01 may be a general-purpose computing device, such as a server device. Components of electronic device 011 may include, but are not limited to, at least one processor 011, at least one memory 012, and a bus 013. Bus 013 includes a data bus, an address bus, and a control bus.

[0150] Exemplarily, the memory 012 may include a volatile memory, such as a random access memory (RAM) 0121 and / or a cache memory 0122 , and may further include a read-only memory (ROM) 0123 .

[0151] Exemplarily, the memory 012 may further include a program tool 0125 having a group (at least one) of program modules 0124 . The program modules 0124 include but are not limited to: an operating system, one or more application programs, other program modules, and program data.

[0152] Exemplarily, the processor 011 executes various functional applications and data processing by running computer programs stored in the memory 012 , such as that in the first embodiment.

[0153] Exemplarily, the electronic device 01 may also communicate with one or more external devices 014 (e.g., a keyboard, a pointing device, etc.), and the communication may be performed through an input / output (I / O) interface 015; and may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network) through a network adapter 016, and the network adapter 016 may also communicate with other modules through a bus 015.

[0154] It should be noted that Figure 7 The electronic device 01 is merely an example and should not limit the functions and scope of use of the embodiments of the present invention.

[0155] Example 4

[0156] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the laser beam dynamic splitting method of the first embodiment is implemented.

[0157] The readable storage medium may include, but is not limited to, a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0158] In an optional embodiment, the present invention can also be implemented in the form of a program product, which includes program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps of the laser beam dynamic splitting method of embodiment one.

[0159] The program code for executing the present invention may be written in any combination of one or more programming languages, and may be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on the remote device.

[0160] It should be noted that, in this document, relational terms such as first and second are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not explicitly listed. Without further limitation, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the article or device comprising the element. Terms such as "connected" or "connected" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. References to orientations or positional relationships, such as "upper," "lower," "left," and "right," are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate description and simplify the description of the present invention. They do not indicate or imply that the device or element referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the present invention.

[0161] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A laser beam dynamic splitting method, characterized in that: include: Step 1: obtaining a laser actual amplitude function according to the laser output beam mode, and obtaining a first incident beam complex amplitude function according to the laser actual amplitude function; Step 2: performing a positive Fourier transform on the complex amplitude function of the first incident light beam to obtain a first focal plane complex amplitude function, wherein the actual amplitude function of the laser is subjected to a positive Fourier transform to obtain an actual focal plane amplitude function; Step 3: establishing a light intensity error index function based on the focal plane actual amplitude function and determining the light intensity error index; when the function value of the light intensity error index function is less than the light intensity error index, sequentially executing step 4; when the function value of the light intensity error index function is greater than or equal to the light intensity error index, jumping to step 7; Step 4: Obtain a focal plane target beam amplitude function according to the required light intensity and position distribution of the multi-beam array, and use the focal plane target beam amplitude function and the weight function to replace the focal plane actual amplitude function to obtain a second focal plane complex amplitude function; Step 5: performing an inverse Fourier transform on the second focal plane complex amplitude function to obtain a second incident light beam complex amplitude function; Step 6: Using the actual laser amplitude function to replace the focal plane target beam amplitude function and the weight function after inverse Fourier transformation in the second incident beam complex amplitude function, obtain a third incident beam complex amplitude function to replace the first incident beam complex amplitude function, and jump to step 2; Step 7: Extract the phase of the complex amplitude function of the first incident light beam to obtain a splitting phase, generate a phase hologram according to the splitting phase, and split the laser output beam according to the phase hologram to obtain a multi-beam array.

2. The laser beam dynamic splitting method according to claim 1, characterized in that: The expression of the amplitude function A of the first incident light beam is: A=A(x,y)*exp(i*phase2); Where A is the complex amplitude function of the first incident light beam; A(x,y) is the actual amplitude function of the laser; x is the abscissa of the coordinate system on the object plane; y is the ordinate of the coordinate system on the object plane; exp is the exponential function with the natural constant e as the base; i is an imaginary number; and phase2 is the phase of the incident light beam.

3. The laser beam dynamic splitting method according to claim 1, characterized in that: The expression of the first focal plane complex amplitude function B is: B=B(x1,y1)*exp(i*phase1); Wherein, B is the complex amplitude function of the first focal plane; B(x1,y1) is the actual amplitude function of the focal plane; x1 is the abscissa of the coordinate system on the focal plane; y1 is the ordinate of the coordinate system on the focal plane; phase1 is the phase of the light beam on the focal plane.

4. The laser beam dynamic splitting method according to claim 1, characterized in that: The light intensity error index β is obtained through experiments based on the consistency requirements of actual processing; The expression of the light intensity error index function is: Among them, max is the maximum value function; min is the minimum value function.

5. The laser beam dynamic splitting method according to claim 1, characterized in that: The expression of the second focal plane complex amplitude function B1 is: B1=B design (x1,y1)*ω(x1,y1)*exp(i*phase1); B1 is the complex amplitude function of the second focal plane; B design (x1, y1) is the amplitude function of the target beam in the focal plane; ω(x1, y1) is the weight function, which is expressed as: The weight function ω(x1, y1) is used to enhance the actual amplitude function B(x1, y1) of the focal plane to be lower than the target beam amplitude function B(x1, y1) of the focal plane. design (x1, y1), and weaken the actual amplitude function B(x1, y1) of the focal plane to be lower than the amplitude function B of the target beam of the focal plane design The amplitude of (x1,y1).

6. The laser beam dynamic splitting method according to claim 1, characterized in that: The expression of the complex amplitude function A1 of the second incident light beam is: A1=A1(x,y)*exp(i*phase2); A1 is the complex amplitude function of the second incident beam; A1(x,y) is the amplitude function B of the focal plane target beam design The amplitude function is obtained by inverse Fourier transforming (x1, y1) and the weight function ω(x1, y1). The expression of the complex amplitude function A2 of the third incident light beam is: A2=A(x,y)*exp(i*phase2); Wherein, A2 is the complex amplitude function of the third incident light beam.

7. The laser beam dynamic splitting method according to claim 1, characterized in that: After step 7, the following steps are further included: Step 8: Obtaining a shaping phase according to a desired beam shape and size, and adding the shaping phase to the beam splitting phase to obtain a beam splitting shaping phase, generating a phase hologram according to the beam splitting shaping phase, and splitting and shaping the laser output beam according to the phase hologram to obtain a multi-beam shaping array; The beam splitting phase is used to control the number and position of the light beams; and the shaping phase is used to control the shape and size of the light beams.

8. A laser beam dynamic splitting system, characterized in that: include: Output beam mode acquisition module, focal plane transformation module, light intensity error judgment module, target beam balance module, object plane transformation module, actual amplitude function conversion module, beam splitting phase acquisition module, shaping phase acquisition module and beam array generation module; wherein, The output beam mode acquisition module is used to acquire the actual amplitude function of the laser according to the output beam mode of the laser, and obtain the complex amplitude function of the first incident light beam according to the actual amplitude function of the laser; The focal plane transformation module is configured to perform a positive Fourier transform on the complex amplitude function of the first incident light beam to obtain a first focal plane complex amplitude function, wherein the actual amplitude function of the laser is subjected to a positive Fourier transform to obtain an actual focal plane amplitude function; The light intensity error judgment module is used to establish a light intensity error index function according to the actual amplitude function of the focal plane and determine the light intensity error index; The target beam balancing module is used to obtain a focal plane target beam amplitude function according to the required light intensity and position distribution of the multi-beam array, and use the focal plane target beam amplitude function and a weight function to replace the focal plane actual amplitude function to obtain a second focal plane complex amplitude function; The object plane transformation module is configured to perform an inverse Fourier transform on the second focal plane complex amplitude function to obtain a second incident light beam complex amplitude function; The actual amplitude function conversion module is configured to replace the focal plane target beam amplitude function and the weight function in the second incident beam complex amplitude function after inverse Fourier transformation with the laser actual amplitude function, thereby obtaining a third incident beam complex amplitude function to replace the first incident beam complex amplitude function; The beam splitting phase acquisition module is used to extract the phase of the complex amplitude function of the first incident light beam to obtain the beam splitting phase, generate a phase hologram based on the beam splitting phase, and split the laser output beam according to the phase hologram to obtain a multi-beam array; the beam splitting phase is used to control the number and position of the light beams; The shaping phase acquisition module is used to obtain the shaping phase according to the required beam shape and size; the shaping phase is used to control the shape and size of the beam; The beam array generation module is used to add the shaping phase and the beam splitting phase to obtain a beam splitting shaping phase; the beam array generation module is also used to generate a phase hologram based on the beam splitting shaping phase, and split and shape the laser output beam according to the phase hologram to obtain a multi-beam shaping array.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the laser beam dynamic splitting method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the laser beam dynamic splitting method according to any one of claims 1 to 7 is implemented.

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