Laser processing device

Abstract

The invention discloses a laser processing device (100) which comprises a beam shaping unit (2) and a focusing lens (3) which are sequentially arranged in the direction (D) of a main light path, the beam shaping unit (2) comprises at least one optical wedge pair, and the optical wedge pair is configured to be suitable for changing the position of the optical wedge pair relative to the main light path so as to cover a preset light path part of the main light path. And is adapted to determine the optical path direction of the predetermined optical path portion by changing the deflection attitude of at least one optical wedge of the optical wedge pair with respect to the main optical path direction (D), such that a main focus corresponding to the main optical path and an additional focus corresponding to the predetermined optical path portion can be generated through the focusing lens (3). According to some exemplary embodiments, the laser processing device which can generate a plurality of focuses and perform high-precision fine adjustment on the positions of the focuses can be provided, and the laser processing device is simple in structure, easy to manufacture, high in compatibility and wide in application.

Description

Technical Field

[0001] The present invention relates to the technical field of laser processing, and in particular to a laser processing device, especially a laser processing device for multi-focus welding, particularly dual-focus welding. Background Art

[0002] In some laser applications such as laser welding, it is often necessary to apply multiple foci so that multiple beams are focused on the processing object at different positions to perform the desired laser processing. The power distribution and position layout of these foci vary according to specific processing requirements. For example, sometimes only a very small offset is required between two foci, that is, it is desired to generate two beams with a very small relative deflection angle in the laser device, such as a relative deflection angle of less than 0.1°, and it is desired to have an accuracy of 0.01°, or even 0.005°. Conventional laser processing devices usually split the laser beam and use a single optical wedge to deflect the corresponding laser beam. Under the above requirements for very small deflection angles, due to the high precision requirements of laser welding, the apex angle of the single optical wedge applied needs to reach 0.2°, and the manufacturing error is usually limited within 0.05°, or even 0.02°. However, the currently used optical wedges are difficult to reach an apex angle of 0.2° due to their manufacturing processes, and the manufacturing tolerance of the optical wedges manufactured at the current technical level has reached about 0.1°. This obviously makes it difficult to achieve the extremely small angle deflection of the above magnitude and accuracy between the laser beams. Therefore, the application of the entire laser processing device is limited due to the above disadvantages of the single optical wedge. Summary of the Invention

[0003] The object of the present invention is to provide a laser processing device that can at least partially solve the above problems existing in the prior art.

[0004] According to a first aspect of the present invention, there is provided a laser processing device, especially a laser processing device for multi-focus welding, particularly dual-focus welding, comprising: A beam shaping unit and a focusing lens arranged in sequence along the main optical path direction, wherein the beam shaping unit includes at least one pair of optical wedges, the pair of optical wedges being configured to be adapted to change their positions relative to the main optical path to cover a predetermined optical path portion of the main optical path, and being adapted to determine the optical path direction of the predetermined optical path portion by changing the deflection attitude of at least one optical wedge in the pair of optical wedges relative to the main optical path direction, so that a main focus corresponding to the main optical path and an additional focus corresponding to the predetermined optical path portion can be generated through the focusing lens.

[0005] According to an alternative embodiment of the present invention, the optical wedge pair includes a first optical wedge and a second optical wedge that are arranged in sequence along the main optical path direction and are placed in a substantially complementary manner, and the first optical wedge and / or the second optical wedge is configured to be deflectable about the normal of the main section of the optical wedge.

[0006] According to an alternative embodiment of the present invention, the first optical wedge is a deflectable optical wedge, the second optical wedge is a fixed optical wedge, and the light exit surface of the second optical wedge is perpendicular to the main optical path direction.

[0007] According to an alternative embodiment of the present invention, the first optical wedge is a fixed optical wedge, the second optical wedge is a deflectable optical wedge, and the light incident surface of the first optical wedge is perpendicular to the main optical path direction.

[0008] According to an alternative embodiment of the present invention, in at least one set of optical wedge pairs, the shapes and sizes of the first optical wedge and the second optical wedge are substantially the same.

[0009] According to an alternative embodiment of the present invention, in at least one set of optical wedge pairs, the apex angles of the first optical wedge and the second optical wedge have angular values selected from the range of 5° to 25°.

[0010] According to an alternative embodiment of the present invention, in the at least one set of optical wedge pairs, the apex angles of the first optical wedge and the second optical wedge are 10° to 15°.

[0011] According to an alternative embodiment of the present invention, in the at least one set of optical wedge pairs, the difference between the apex angles of the first optical wedge and the second optical wedge is 0° to 2°, particularly 0° to 0.5°.

[0012] According to an alternative embodiment of the present invention, in at least one set of optical wedge pairs, the refractive indices n of the first optical wedge and the second optical wedge are substantially equal.

[0013] According to an alternative embodiment of the present invention, in at least one set of additional optical wedge pairs, the shapes and / or sizes of the first optical wedge and the second optical wedge are different.

[0014] According to an alternative embodiment of the present invention, in at least one set of additional optical wedge pairs, the difference between the apex angles of the first optical wedge and the second optical wedge is greater than 2°.

[0015] According to an alternative embodiment of the present invention, the beam shaping unit further includes a moving actuator corresponding to each group of optical wedge pairs, which is configured to perform the position movement of the corresponding optical wedge pair.

[0016] According to an alternative embodiment of the present invention, the beam shaping unit further includes a deflection actuator corresponding to at least one optical wedge in each group of optical wedge pairs, which is configured to perform the deflection movement of the corresponding optical wedge.

[0017] According to an alternative embodiment of the present invention, the beam shaping unit further comprises at least one set of single optical wedges, the single optical wedge having an apex angle less than 25° and / or being adapted to be deflected relative to the main optical path direction.

[0018] According to an alternative embodiment of the present invention, the beam shaping unit further comprises a diffractive optical element, in particular a diffraction grating.

[0019] According to an alternative embodiment of the present invention, the laser processing device further comprises a control unit configured to control the beam shaping unit to perform various settings and operations.

[0020] According to certain exemplary embodiments of the present invention, a laser processing device capable of generating multiple foci and finely adjusting the focus positions with high precision can be provided, which has a simple structure, is easy to manufacture, has strong compatibility and wide applications. Description of the Drawings

[0021] Hereinafter, the present invention will be described in more detail by referring to the drawings, and the principles, features and advantages of the present invention can be better understood. The drawings include: Figure 1 A schematic structural diagram of a laser processing device according to an exemplary embodiment of the present invention is shown; Figure 2 A working state of the beam shaping unit of a laser processing device according to an exemplary embodiment of the present invention is schematically shown; Figures 3a to 3e The working principle of at least one set of optical wedge pairs of the beam shaping unit of a laser processing device according to another exemplary embodiment of the present invention is shown; Figure 4a and Figure 4b The deflection of an incident laser beam by a single optical wedge is shown on an exaggerated scale for different incident angles of the incident laser beam, Figure 4c A graph showing the corresponding relationship between the angular deflection amount of the output laser beam relative to the incident laser beam and the incident angle of the incident laser beam for a single optical wedge is shown; Figure 5a and Figure 5b The cases where a laser beam passes through two optical wedges in an optical wedge pair in sequence in an example are respectively shown. Detailed Description of the Invention

[0022] In order to make the technical problems to be solved, technical solutions and beneficial technical effects of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the protection scope of the present invention. In addition, for clarity, some reference numerals are omitted in some of the drawings, which of course does not mean that the corresponding embodiments do not include the unmarked parts.

[0023] Figure 1 FIG. 4 shows a schematic structural diagram of a laser processing apparatus 100 according to an exemplary embodiment of the present invention. As Figure 1 shown, the laser processing apparatus 100 according to an exemplary embodiment of the present invention at least includes a laser source 1 that emits a laser beam, a beam shaping unit 2 and a focusing lens 3 that are sequentially arranged along the main optical path direction D of the laser beam. The laser beam emitted from the laser source 1 forms corresponding focal points on the focal plane of the focusing lens 3 after sequentially passing through the beam shaping unit 2 and the focusing lens 3 along the main optical path direction D, and is suitable for performing corresponding laser processing on the workpiece 900.

[0024] Figure 2 FIG. 10 schematically shows a working state of the beam shaping unit 2 of the laser processing apparatus 100 according to an exemplary embodiment of the present invention. As Figure 2 shown, the beam shaping unit 2 may include multiple groups of beam shaping devices 21-24 for performing various adjustments on the laser beam. At least a part, preferably all, of these beam shaping devices 21-24 are configured to be able to change their respective positions relative to the main optical path to perform corresponding shaping operations on a predetermined optical path part of the main optical path. In the laser processing apparatus 100 according to the exemplary embodiment of the present invention, in order to be able to change the optical path direction of a part of the laser beam by a small angle magnitude of, for example, 0.1° and finally obtain two focal points with a very small offset amount through the focusing lens 3, the beam shaping unit 2 is configured with at least one pair of optical wedges 21. The pair of optical wedges 21 is composed of two identical or similar optical wedges placed substantially complementarily, and can deflect a part of the laser beam transmitted through the pair of optical wedges 21 by a small angle through the deflection of at least one optical wedge relative to the other optical wedge. Here, "placed complementarily" means a placement method in which the apex angles of the same or similar optical wedges are opposite and the same or equivalent working surfaces face each other, for example Figures 3a to 3e shown. In addition, the "apex angle" here refers to the angle formed between the two working surfaces (refracting surfaces) or their extended surfaces of the optical wedge, that is to say, the apex angle here does not need to be a real angle, that is, the optical wedge can also be a trapezoidal optical wedge.

[0025] The principle on which the embodiments of the present invention are based is as Figures 3a to 3eAs shown, each optical wedge is shown in the principal section of the optical wedge (the optical axis section perpendicular to the edge of the intersection line as the working surface), and as described above, the two optical wedges are placed substantially complementarily. Among them Figure 3b and Figure 3c respectively show two cases of deflection of the optical wedge located above in each figure, Figure 3d and Figure 3e respectively show two cases of deflection of the optical wedge located below in each figure, and it is assumed that the apex angles of the two optical wedges are the same. First, as Figure 3a shown, when two substantially identical optical wedges are placed complementarily to form an optical wedge pair, and the deflection angle between the two optical wedges is 0°, the incident laser beam undergoes two refractions with the same angle but opposite directions, resulting in a slight position shift, but the optical path direction is parallel to the original optical path direction, that is, at this time, the optical wedge pair deflects the corresponding optical path part by 0° (no deflection). As Figures 3b to 3e respectively shown, when one of the optical wedges is fixed and the other optical wedge is rotated by a certain angle relative to the fixed optical wedge in the direction indicated by the hollow arrow in each figure, the incident laser beam will undergo multiple refractions with different angles and directions in the two optical wedges, so that an effect of finding the difference in the opposite direction is formed between the two deflections of the laser beam experienced, and the finally emitted laser beam will only have a slight deflection relative to the original optical path direction, and the deflection angle of this deflection will be much smaller than the rotation angle of the optical wedge. Note that for illustrative purposes, each figure schematically shows each deflection of the laser beam and the final slight deflection angle in an exaggerated manner. It can be seen that since a pair of optical wedges placed substantially complementarily can cancel each other's refraction effect on the optical path to a certain extent, therefore, by using such a pair of optical wedges, a very small deflection angle of the incident optical path can be obtained through the relative deflection between the optical wedges, and its deflection direction depends on the specific specifications and specific deflection methods of the optical wedges.

[0026] The following takes an optical wedge with an apex angle of 13° and a refractive index n = 1.46 as an example for further detailed description. Figure 4a and Figure 4b show the deflection of the incident laser beam by a single optical wedge under different incident angles of the incident laser beam on an exaggerated scale. It can be seen from the figure that as the incident angle of the incident laser beam changes, or relatively, as the optical wedge deflects, the deflection angle of the emitted laser beam relative to the incident laser beam from a single optical wedge also changes accordingly. From this, a curve graph of the corresponding relationship between the angle deflection amount δ of the emitted laser beam relative to the incident laser beam for this single optical wedge and the incident angle α of the incident laser beam as shown in Figure 4c can be determined. After determining the example of a single optical wedge such as Figure 4cAfter obtaining the corresponding relationship between the deflection angles of the laser beam as shown, when using two optical wedges to form an optical wedge pair, based on the incident angle of the incident laser beam on the first optical wedge, the corresponding angle deflection amounts can be sequentially queried in the curve graph for the two optical wedges, and then the angle deflection amount of the final laser beam relative to the incident laser beam when it exits from the second optical wedge, that is, from the optical wedge pair, can be obtained.

[0027] As an example, an optical wedge pair is formed by using two of the above-mentioned optical wedges (apex angle 13°, refractive index n = 1.46), and the second optical wedge is deflected according to the Figure 3d shown pattern. The situations where the laser beam passes through the two optical wedges in sequence are shown in Figure 5a and Figure 5b respectively. As Figure 5a shown, the incident laser beam A enters the first optical wedge with a first incident angle (exemplarily shown as 0° in the figure). The angle deflection amount Figure 4c of the first outgoing laser beam B relative to the first incident angle can be queried in the curve graph of . Then, considering the deflection angle β of the second optical wedge relative to the first optical wedge , the second incident angle when the first outgoing laser beam B enters the second optical wedge can be calculated. It should be noted that since the two identical optical wedges are placed complementarily, that is, with opposite apex angles, for the curve graph of corresponding to the first optical wedge Figure 4c , the sign of the second incident angle should be reversed before querying (it may be necessary to query the part with a negative incident angle, Figure 4c not shown in the figure). The angle deflection amount of the corresponding second outgoing laser beam C relative to the second incident angle is obtained, and then the total angle deflection amount of the second outgoing laser beam C relative to the incident laser beam A can be calculated based on and β. Conversely, according to the deflection angle of the desired outgoing laser beam, the corresponding curve graph can be reversely queried for the second optical wedge to determine its second incident angle , and then the deflection angle β of the second optical wedge relative to the first optical wedge can be determined based on the fixed angle deflection amount of the first outgoing laser beam B. Similarly, in the Figure 3b , 3c and 3e respective shown patterns, the attitude or deflection angle of the corresponding optical wedge can also be determined according to the deflection angle of the desired outgoing laser beam by reversely querying the corresponding curve graph.

[0028] It can also be seen from the schematic diagrams of Figure 5a and Figure 5b that after the refractions in opposite directions of the two optical wedges, the deflection amount of the final second output laser beam C with respect to the incident laser beam A is less than that of a single optical wedge for the incident laser beam A. Generally, when the two optical wedges are substantially the same or similar, when one optical wedge is deflected by about 5°, the deflection angle of the final output laser beam with respect to the initially incident laser beam can be less than 0.1°. It can be seen that by using an appropriately selected pair of optical wedges, the deflection angle of the output laser beam can be changed slightly and with high precision through the controllable deflection of the optical wedges.

[0029] In addition, taking the mode where the beam incident angle of the first optical wedge along the optical path shown in Figure 3d and 3e is 0° and only the second optical wedge is deflected as an example, the angle of the final output laser beam can also be calculated by applying the following formula. In the following formula, , , , successively represent the laser beam angles at the four surfaces from top to bottom of the two optical wedges in Figure 3d and Figure 3e , and all angles are defined as positive when rotating clockwise around the axis perpendicular to Figure 3d and Figure 3e the paper surface and negative when rotating counterclockwise. and are the apex angles of the optical wedges, and β is also the deflection angle of the second optical wedge. is the refractive index of the two optical wedges, for example, about 1.5. Assuming that the light beam only propagates in air (vacuum) and optical elements, and the refractive index of air or vacuum is set to 1, from the calculation formula of refraction, it can be obtained that:

[0030] Similarly, conversely, according to the angle of the desired output laser beam, and the fixed , and , the and the deflection angle β of the second optical wedge can be deduced inversely. Similarly, in the modes shown in Figure 3b and 3c respectively, the attitude or deflection angle of the corresponding optical wedge can also be determined according to the corresponding formula.

[0031] It can also be obtained from the formula that when light passes through two complementary optical wedges, the two deflections of the light form an effect of opposite subtraction, so that a very small deflection angle can be obtained.

[0032] Based on the above principle, as Figure 2 shown, in the laser processing apparatus 100, as a pair of optical wedges 21 in the beam shaping unit 2, a first optical wedge substantially the same and a second optical wedge are arranged in sequence along the main optical path direction D and placed substantially complementary to each other. The beam shaping unit 2 further includes a moving actuator corresponding to the pair of optical wedges 21 and a deflecting actuator corresponding to the deflectable optical wedge in the pair of optical wedges (both not shown). The moving actuator can be, for example, a clamp and is configured to perform the position movement of the corresponding pair of optical wedges 21 so that the corresponding pair of optical wedges 21 can cover a predetermined optical path portion of a predetermined ratio of the main optical path, and determine the power ratio between the predetermined optical path portion to be deflected and the remaining portion of the main optical path; the deflecting actuator is configured to perform the deflecting movement of the corresponding deflectable optical wedge so that the corresponding first optical wedge and / or the second optical wedge can deflect around the normal of the main section of the optical wedge. Thus, the pair of optical wedges 21 is configured to be adapted to change its position relative to the main optical path to determine the power ratio of the predetermined optical path portion it covers, and is adapted to determine the optical path direction of the predetermined optical path portion it covers by changing the deflection attitude of at least one of the deflectable optical wedges relative to the main optical path direction D, so that a main focus corresponding to the main optical path and an additional focus corresponding to the predetermined optical path portion can be generated through the focusing lens 3.

[0033] As described above, since the appropriate deflection of the optical wedges in the pair of optical wedges 21 can cause a small-angle deflection of the laser beam, the corresponding small-scale distance adjustment between the main focus and the additional focus can be achieved.

[0034] On the other hand, by means of the pair of optical wedges 21 in the beam shaping unit 2 as described above, it is also possible to reduce the manufacturing requirements of the optical wedges and increase the tolerance range of optical wedge manufacturing or compensate for the manufacturing tolerances of the optical wedges. For example, in some cases of high-precision processing, such as dual-focus welding, the deflection angle of a part of the laser beam required is 0.2 ± 0.02. The apex angle of a single optical wedge corresponding to this angle has reached the angle tolerance limit for optical wedge manufacturers, resulting in a low manufacturing yield and high costs. However, in the laser processing apparatus 100 according to the embodiment of the present invention, this small deflection angle can be achieved by a pair of conventional optical wedges (for example, apex angle 12°), thereby reducing the parameter requirements for the optical wedges and saving manufacturing costs. For another example, for an optical wedge with an apex angle of 12°, the tolerance of the optical wedges produced by an optical element manufacturer is ±0.5°. When two optical wedges with apex angles of 12° and 12.5° are selected without loss of generality, obviously they cannot cancel the deflection of the laser beam by simple complementary placement due to different apex angles. At this time, for example, by fixing the first optical wedge as described above And for the second optical wedge By inversely querying the curve graph or inversely deriving the formula, it is still possible to obtain a desired minute laser beam deflection angle, such as less than 0.1 degree, by determining the relative attitude or deflection angle of the second optical wedge while being free from the influence of the manufacturing tolerances of the optical wedge.

[0035] In an optional exemplary embodiment, the first optical wedge is a deflectable optical wedge, and the second optical wedge is a fixed optical wedge, and the light exit surface of the second optical wedge is perpendicular to the main optical path direction D. With such a setting, since the second optical wedge is fixed and its light exit surface is perpendicular to the main optical path direction D, it is convenient to determine the deflection attitude of the first optical wedge by querying the above-mentioned curve graph corresponding to each optical wedge or through relatively simple formula derivation according to the deflection angle of the finally emitted laser beam required.

[0036] In a particularly preferred exemplary embodiment, the first optical wedge is a fixed optical wedge, and the second optical wedge is a deflectable optical wedge, and the light incident surface of the first optical wedge is perpendicular to the main optical path direction D. With such a setting, since the first optical wedge is fixed and its light incident surface is perpendicular to the main optical path direction D, the deflection angle of the laser beam emitted from the first optical wedge is fixed, so that it is more convenient to determine the deflection attitude of the second optical wedge by querying the above-mentioned curve graph corresponding to the second optical wedge or through simple formula derivation according to this emitted angle and the required deflection angle of the finally emitted laser beam.

[0037] As needed, alternatively or additionally, the first optical wedge and the second optical wedge can both be deflectable optical wedges. Moreover, the beam shaping unit 2 can include a plurality of different optical wedge pairs 21. In one or more optical wedge pairs 21, only the first optical wedge is a deflectable optical wedge. In one or more other optical wedge pairs 21, only the second optical wedge is a deflectable optical wedge, while in the remaining optical wedge pairs 21, both optical wedges are deflectable optical wedges, and these optical wedge pairs 21 can be selectively called and set according to different application requirements.

[0038] In an exemplary embodiment, in at least one group of optical wedge pairs, the first optical wedge and the second optical wedge ​The apex angle has an angular value selected from the range of 5° to 25°. In a more preferred embodiment, the first optical wedge and the second optical wedge have an apex angle of 10° to 15°, such as 11° or 12°. Two optical wedges with substantially the same shape and size having this angular range or angular value are more conducive to causing a small angular offset of the corresponding laser beam portion through deflection.

[0039] The first optical wedge and the second optical wedge may have a small angular difference between their apex angles, and the difference range may be 0° to 2°, more preferably 0° to 0.5°. For example, the apex angle of the first optical wedge is 11°, and the apex angle of the second optical wedge is 11.3°, as long as the desired small-magnitude angular deflection of the laser beam portion can be achieved. That is to say, the apex angles of the first optical wedge and the second optical wedge are similar, and do not need to be exactly the same. Of course, the same first optical wedge and second optical wedge are more convenient for angle adjustment and more conducive to mass production.

[0040] In the laser processing apparatus according to an exemplary embodiment of the present invention, the adjustment of the deflection angle of the partial laser beam, that is, the adjustment of the optical path direction, is not limited to the adjustment of a small angle. In an exemplary embodiment, the beam shaping unit 2 further includes another optical wedge pair 22 that can adjust the partial optical path direction with a large angular magnitude and with high precision. For example, in this other optical wedge pair 22, the two optical wedges have different shapes and / or sizes, or the difference between the apex angles of the first optical wedge and the second optical wedge can be relatively large, such as greater than 2° or even larger, so that the deflection of one of them can cause a large angular deflection of the optical path direction of the emitted laser beam. In one example, an optical wedge pair with apex angles of 13° and 15° respectively is used. When one optical wedge is deflected by 5°, an angular deflection of the emitted laser beam of 1.0° to 1.1° can be obtained.

[0041] In an exemplary embodiment, the beam shaping unit 2 further includes at least one set of single optical wedges 23. The single optical wedges 23 may have an apex angle less than 25° and / or be adapted to deflect relative to the main optical path direction D, and can perform the desired optical path adjustment on the corresponding optical path portion.

[0042] In an exemplary embodiment, the optical wedges in the optical wedge pair 21, the other optical wedge pair 22, and / or the single optical wedges 23 are all coated with an antireflection film, and the antireflection film is applied to each surface and corner of the optical wedge. If the angle of the optical wedge is very small, such as less than 20°, the same antireflection film can be used to cover different surfaces of the optical wedge, which is beneficial for the mass production of the optical wedge.

[0043] In an exemplary embodiment, the beam shaping unit 2 further includes a diffractive optical element 24, particularly a diffraction grating, which can also be configured to change its position relative to the main optical path to perform corresponding shaping processing on a predetermined optical path portion of the main optical path.

[0044] In an exemplary embodiment, the beam shaping unit 2 includes various beam shaping devices 21-24 described in the above embodiments and / or other well-known beam shaping devices not mentioned. These beam shaping devices can be selectively used simultaneously in parallel or in series to divide the main laser beam into multiple parts and perform one or more shaping processes on each part, so as to obtain multiple focal points with desired power distribution and position layout for target processing.

[0045] The laser processing device 100 may further include a control unit 4, which is configured to control the beam shaping unit 2 to perform various settings and operations. For example, according to the processing requirements (the number of required focal points, power ratio, relative position), determine the operations of each shaping optical device, such as the arrangement position of an optical wedge pair 21 relative to the main optical path and the deflection angles of one or both of the optical wedges, and control the execution of its operations, such as the translation of the optical wedge pair and the deflection of the optical wedge.

[0046] For those skilled in the art, it is obvious that the technical idea of the present invention is not limited to laser welding of lithium battery casings, but can also be used for welding other structures of any shape. At the same time, it is not limited to the fully enclosed arrangement, but can also be adjusted according to actual welding needs.

[0047] Although specific embodiments of the present invention are described in detail herein, they are given for explanatory purposes only and should not be considered as limiting the scope of the present invention. Various substitutions, changes, and modifications can also be conceived without departing from the spirit and scope of the present invention.

Claims

1. A laser processing device (100) for multi-focus welding, comprising: A beam shaping unit (2) and a focusing lens (3) arranged in sequence along the main optical path direction (D), Wherein, the beam shaping unit (2) includes at least one set of optical wedge pairs, and the optical wedge pairs are configured to be adapted to change their positions relative to the main optical path to cover a predetermined optical path portion of the main optical path, and are adapted to determine the optical path direction of the predetermined optical path portion by changing the deflection attitude of at least one optical wedge in the optical wedge pair with respect to the normal of the main cross-section of the optical wedge in the main optical path direction (D), so that a main focus corresponding to the main optical path and an additional focus corresponding to the predetermined optical path portion can be generated through the focusing lens (3).

2. The laser processing device (100) according to claim 1, wherein, The optical wedge pair includes a first optical wedge ( ) and a second optical wedge ( ) that are arranged in sequence along the direction of the main optical path (D) and are placed in a substantially complementary manner, and wherein: The first optical wedge ( ) is a deflectable optical wedge, the second optical wedge ( ) is a fixed optical wedge, and the light exit surface of the second optical wedge ( ) is perpendicular to the main optical path direction (D); or The first optical wedge ( ) is a fixed optical wedge, the second optical wedge ( ) is a deflectable optical wedge, and the light incident surface of the first optical wedge ( ) is perpendicular to the main optical path direction (D).

3. The laser processing device (100) according to claim 2, wherein, In at least one set of optical wedge pairs (21): The first optical wedge ( ) and the second optical wedge ( ) are substantially the same in shape and size; The apex angle of the first optical wedge ( ) and the second optical wedge ( ) has an angular value selected from the range of 5° to 25°; and / or The refractive index n of the first optical wedge ( ) and the second optical wedge ( ) is substantially equal.

4. The laser processing device (100) according to claim 3, wherein, In the at least one set of optical wedge pairs (21): The apex angle of the first optical wedge ( ) and the second optical wedge ( ) is 10° to 15°; and / or The difference in the apex angles between the first optical wedge ( ) and the second optical wedge ( ) is 0° to 2°.

5. The laser processing device (100) according to claim 3, wherein, In at least one set of additional optical wedge pairs (22): The shapes and / or sizes of the first optical wedge and the second optical wedge are different; and / or The difference in the apex angles of the first optical wedge and the second optical wedge is greater than 2°.

6. The laser processing device (100) according to any one of claims 1, 2, 4, and 5, wherein, The beam shaping unit (2) further includes: A movement execution mechanism corresponding to each set of optical wedge pairs, which is configured to execute the position movement of the corresponding optical wedge pair; and A deflection execution mechanism corresponding to at least one optical wedge in each set of optical wedge pairs, which is configured to execute the deflection movement of the corresponding optical wedge.

7. The laser processing device (100) according to any one of claims 1, 2, 4, and 5, wherein, The beam shaping unit (2) further includes at least one set of single optical wedges (23), and the single optical wedges (23) have an apex angle less than 25° and / or are adapted to be deflected relative to the main optical path direction (D).

8. The laser processing device (100) according to any one of claims 1, 2, 4, and 5, wherein, The beam shaping unit (2) further includes a diffractive optical element (24).

9. The laser processing device (100) according to any one of claims 1, 2, 4, and 5, further comprising: A control unit (4), which is configured to be adapted to control the beam shaping unit (2) to perform various settings and operations.

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