Multi-beam space angle positioning device and use method

Abstract

The invention relates to a multi-beam space angle positioning device and a using method, and belongs to the technical field of laser optics, the multi-beam space angle positioning device comprises a main positioning plate and a secondary positioning plate which are coaxially arranged, a plurality of main positioning holes are formed in the main positioning plate, and the number of the main positioning holes is equal to that of laser beams; a plurality of main positioning holes are formed in the main positioning plate, the arrangement shape formed by the plurality of main positioning holes is the same as the arrangement shape of the plurality of laser beams focused to the same target spot, a plurality of secondary positioning holes are formed in the secondary positioning plate, and the number of the secondary positioning holes and the arrangement shape formed by the plurality of secondary positioning holes are the same as those of the main positioning holes; according to the multi-beam laser positioning device, the positioning problem in the application of the multi-beam laser technology in the prior art can be solved, the multi-beam positioning requirements of different space angles are met, and the multi-beam laser positioning device is simple in structure and suitable for table-board type or small-sized optical machine instruments.

Description

Technical Field

[0001] The invention belongs to the field of laser optics technology, and in particular relates to a multi-beam spatial angle positioning device and a use method thereof. Background Art

[0002] With the continuous advancement of science and technology, laser technology has been widely used in many important fields such as material processing, micro-nano manufacturing and optical communications. However, in the face of increasingly complex material properties and the growing demand for high-precision processing, traditional single-beam laser systems have gradually exposed their limitations. In contrast, multi-beam laser technology has stood out with its unique advantages, greatly broadening the application scope of laser technology and enhancing the ability to explore new mechanisms, new phenomena and innovative applications.

[0003] By precisely controlling the interaction between multiple laser beams, multi-beam technology can achieve more complex and precise light field control. For example, when specific phase matching conditions are met, multiple beams can stimulate nonlinear optical effects such as four-wave mixing and stimulated Raman scattering. These effects not only enrich the content of optical research, but also provide the possibility for high-time and space resolution measurements such as transient grating shutter technology and spectral broadening decoherence for improving beam-target coupling. In addition, when multiple laser beams are focused on the same medium, the light intensity can be significantly increased at the focus position, effectively overcoming the problem of single-beam laser power limitation, making multi-beam laser technology show better performance in fields such as material processing and micro-nano manufacturing, such as improving processing efficiency and achieving higher processing accuracy.

[0004] In order to fully realize the potential of multi-beam laser technology, the spatial angle arrangement between the laser beams must be precisely controlled, because this arrangement directly determines the light field distribution and its interaction effect, thus affecting the final application results. At present, in large-scale laser devices or high-precision instruments and equipment, the spatial angle positioning of multiple beams mainly depends on the precisely designed optomechanical structure, which not only requires deep theoretical knowledge for calculation, but also requires high-precision mechanical processing to ensure the implementation effect, which greatly increases the complexity and cost of the system and limits the application of multi-beam laser technology in desktop principle verification or small optomechanical instruments.

[0005] For tabletop or small optomechanical instruments, the existing optomechanical structure design schemes are often difficult to directly apply due to the limitations of size, cost and flexibility, which severely restricts the application of multi-beam laser technology in these fields and cannot give full play to its advantages. Therefore, how to break through the current technical limitations and achieve precise positioning of multi-beam spatial angles has become a key challenge to promote the widespread application of multi-beam laser technology. Summary of the invention

[0006] In view of the various deficiencies of the prior art, a multi-beam spatial angle positioning device and a usage method are proposed, which can solve the positioning problems in the application of multi-beam laser technology in the prior art, meet the multi-beam positioning requirements of different spatial angles, have a simple structure, and are applicable to tabletop or small optical mechanical instruments.

[0007] To achieve the above object, the present invention provides the following technical solutions: In a first aspect, the present invention provides a multi-beam spatial angle positioning device, including a main positioning plate and a secondary positioning plate arranged coaxially. A plurality of main positioning holes are provided on the main positioning plate, and the number of the main positioning holes is equal to the number of laser beams. The arrangement shape formed by the plurality of main positioning holes is the same as the arrangement shape of the multi-beam laser beams focused on the same target point. A plurality of secondary positioning holes are provided on the secondary positioning plate, and both the number of the secondary positioning holes and the arrangement shape formed by the plurality of secondary positioning holes are the same as those of the main positioning holes. The distance between the main positioning hole and the central axis of the main positioning plate is greater than the distance between the secondary positioning hole and the central axis of the secondary positioning plate.

[0008] This technical solution is further configured such that the distance between the main positioning plate and the secondary positioning plate is adjustable, so that the same laser beam sequentially passes through the main positioning hole and the secondary positioning hole corresponding to the main positioning hole.

[0009] This technical solution is further configured such that central alignment marks are provided on the periphery of both the main positioning hole and the secondary positioning hole.

[0010] This technical solution is further configured such that a plurality of main positioning hole groups are provided on the main positioning plate, each main positioning hole group includes a plurality of main positioning holes, and the shapes of the plurality of main positioning hole groups are different; A plurality of secondary positioning hole groups are provided on the secondary positioning plate, and the layout structure of the secondary positioning hole groups is the same as that of the main positioning hole groups.

[0011] This technical solution is further configured such that the main positioning plate and the secondary positioning plate are slidably arranged on a transverse support rod, and a scale ruler is provided on the surface of the transverse support rod.

[0012] This technical solution is further configured such that through holes are provided on both the main positioning plate and the secondary positioning plate, fixing blocks are provided at the through holes, and first locking members with ends abutted against the transverse support rod are provided on the fixing blocks.

[0013] This technical solution is further configured such that the transverse support rod is detachably arranged on a support, mounting holes are provided at the bottom of the support, and the support is connected to an optical table through the mounting holes and connecting members.

[0014] This technical solution is further configured such that a bayonet is provided at the top of the support, and the bayonet is snap-fitted with the transverse support rod and locked by a second locking member.

[0015] Second, the present invention provides a method for using a multi-beam spatial angle positioning device, including the following steps: Determine and adjust the distance between the main positioning plate and the secondary positioning plate according to the spatial angle of the laser beam; Adjust the mirror in the pre-stage optical system so that a laser beam sequentially passes through the main positioning hole and the secondary positioning hole corresponding to the main positioning hole to complete the spatial angle positioning of the laser beam, and sequentially adjust and complete the spatial angle positioning of other laser beams. This technical solution is further configured such that, according to the spatial angle of the laser beam, the distance between the main positioning plate and the secondary positioning plate is determined and adjusted, specifically: The spatial angle of the laser beam is equal to the included angle between the line connecting the center of the main positioning hole and the center of the corresponding secondary positioning hole and the central axis of the main positioning plate; The distance between the main positioning plate and the secondary positioning plate is L, and the spatial angle of the laser beam is θ, then , where is the distance between the main positioning hole and the central axis of the main positioning plate, is the distance between the secondary positioning hole and the central axis of the secondary positioning plate.

[0016] The beneficial effects of the present invention are: 1. By providing corresponding main positioning holes and secondary positioning holes, based on the principle of two points determining a line and the straight-line propagation of light beams, by adjusting the distance between the main positioning plate and the secondary positioning plate, high-precision spatial angle positioning of multiple beams can be achieved, avoiding the complex and precise optical-mechanical structure design in traditional methods, greatly simplifying the operation process, and improving the positioning efficiency.

[0017] 2. Compared with traditional positioning methods that rely on high-precision machining and complex optical-mechanical structures, the present invention has a simple structure and only requires a small number of parts to be processed, significantly reducing the system complexity and cost, and lowering the application threshold of multi-beam laser technology; all structural parts are anodized, effectively reducing the stray light generated by beam reflection, and further ensuring the beam quality and focusing effect.

[0018] 3. By designing main positioning plates and secondary positioning plates with different specifications and adjusting the distance between them, the positioning requirements of multiple beams with different spatial angles can be flexibly met, enhancing the flexibility and applicability of the device, and enabling multi-beam laser technology to be more widely applied in tabletop or small optical-mechanical instrument equipment. Description of the Drawings

[0019] Figure 1Schematic diagram of the multi-beam spatial angle positioning device in the embodiment of the present invention; Figure 2 Exploded view of the multi-beam spatial angle positioning device in the embodiment of the present invention; Figure 3 Schematic diagram of the main positioning plate in the embodiment of the present invention; Figure 4 Schematic diagram of the transverse support rod in the embodiment of the present invention; Figure 5 Schematic diagram of the support in the embodiment of the present invention; Figure 6 Flow chart of the usage method of the multi-beam spatial angle positioning device in the embodiment of the present invention; In the drawings: 1, main positioning plate; 2, secondary positioning plate; 3, transverse support rod; 4, main positioning hole; 5, secondary positioning hole; 6, support; 7, second locking member; 8, center alignment mark; 9, scale ruler; 10, fixing block; 11, bayonet. Detailed implementation manners

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application. In addition, the directional terms mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only the directions referring to the drawings. Therefore, the directional terms used are for illustration rather than limitation of the present invention.

[0021] Embodiment 1: A multi-beam spatial angle positioning device, please refer to Figures 1 to 2 , including a main positioning plate 1 and a secondary positioning plate 2 arranged coaxially. A plurality of main positioning holes 4 are provided on the main positioning plate 1. The number of the main positioning holes 4 is equal to the number of laser beams. The arrangement shape formed by the plurality of main positioning holes 4 is the same as the arrangement shape of the multi-beam laser beams focused on the same target point. A plurality of secondary positioning holes 5 are provided on the secondary positioning plate 2. The number of the secondary positioning holes 5 and the arrangement shape formed by the plurality of secondary positioning holes 5 are both the same as those of the main positioning holes 4. The distance between the main positioning holes 4 and the central axis of the main positioning plate 1 is greater than the distance between the secondary positioning holes 5 and the central axis of the secondary positioning plate 2.

[0022] In a laser focusing experiment, multiple laser beams need to be incident at a certain spatial angle and focused on the same target point. To achieve this goal, it is necessary to accurately position the spatial angle of each laser beam. The multi-beam spatial angle positioning device provided in this embodiment can accurately position the spatial angle of each laser beam through the combination of positioning holes on the main positioning plate 1 and the secondary positioning plate 2.

[0023] Furthermore, both the main positioning plate 1 and the secondary positioning plate 2 are plate-like structures, and materials such as aluminum alloy, stainless steel, or plexiglass, which have good rigidity and stability, can be selected. In this embodiment, both the main positioning plate 1 and the secondary positioning plate 2 are set as rectangles. The diameters of the main positioning holes 4 and the secondary positioning holes 5 can be determined according to the diameter of the laser beam.

[0024] Furthermore, the central axes of the main positioning plate 1 and the secondary positioning plate 2 coincide. The distance between the main positioning hole 4 and the central axis of the main positioning plate 1 is greater than the distance between the secondary positioning hole 5 and the central axis of the secondary positioning plate 2. This design makes the angle between the line connecting the centers of the main positioning hole 4 and the corresponding secondary positioning hole 5 and the central axis of the main positioning plate 1 equal to the spatial angle of the laser beam. That is to say, the spatial angle positioning can be achieved after the laser beam passes through the corresponding main positioning hole 4 and secondary positioning hole 5 in sequence.

[0025] Furthermore, the arrangement shape of the main positioning holes 4 on the main positioning plate 1 is the same as the arrangement shape of the multiple laser beams, which ensures that the positioning device can adapt to different laser system configurations. For example, in a four-beam laser beam system, the main positioning holes 4 can be arranged in a square or diamond shape; in an eight-beam laser beam system, the main positioning holes 4 can be arranged in an octagonal shape; in a twelve-beam laser beam system, the main positioning holes 4 can be arranged in a dodecagonal shape. The arrangement shape of the secondary positioning holes 5 on the secondary positioning plate 2 is the same as that of the main positioning holes 4, but the distance from the central axis is smaller, forming a similar figure that is proportionally reduced.

[0026] In the multi-beam spatial angle positioning device of this embodiment, please refer to Figures 1 to 2 , the distance between the main positioning plate 1 and the secondary positioning plate 2 is adjustable, so that the same laser beam passes through the main positioning hole 4 and the secondary positioning hole 5 corresponding to the main positioning hole 4 in sequence. This design enables the device to adapt to different spatial angle requirements. By increasing or decreasing the distance between the main positioning plate 1 and the secondary positioning plate 2, the spatial angle of the laser beam can be changed.

[0027] In the multi-beam spatial angle positioning device of this embodiment, please refer to Figures 1 to 2 , center alignment marks 8 are provided around the main positioning holes 4 and the secondary positioning holes 5. These marks are usually concentric circles or crosshairs, which help the operator to more accurately adjust the position of the laser beam.

[0028] Specifically, a coaxial ring and cross marks are laser engraved around the main positioning hole 4.

[0029] Specifically, the aperture of the main positioning hole 4 and the aperture of the secondary positioning hole 5 are slightly larger than the spot diameter of the laser beam, and the difference is about 20% of the spot diameter.

[0030] In the multi-beam spatial angle positioning device of this embodiment, please refer to Figures 1 to 2 , a number of main positioning hole groups are provided on the main positioning plate 1. Each main positioning hole group includes a number of main positioning holes 4. The shapes of the several main positioning hole groups are different. This design enables the device to adapt to different experimental configurations. A number of secondary positioning hole groups are provided on the secondary positioning plate 2. The layout structure of the secondary positioning hole groups is the same as the layout structure of the main positioning hole groups to ensure the corresponding relationship between the two positioning plates.

[0031] It should be noted that when the distances from the respective main positioning holes 4 in the same main positioning hole group to the central axis of the main positioning plate 1 are the same, this positioning device can be used to position multiple laser beams with the same spatial angle. When the distances from the respective main positioning holes 4 in the same main positioning hole group to the central axis of the main positioning plate 1 are not all the same, this positioning device can be used to position multiple laser beams with different spatial angles.

[0032] Specifically, 2 main positioning hole groups are provided on the main positioning plate 1. The first main positioning hole group is arranged in a square. The number of main positioning holes in this main positioning hole group is 4. The distance between adjacent main positioning holes is 50 mm. The distance from the main positioning hole to the central axis of the main positioning plate 1 is 35.35 mm. The diameter of the main positioning hole is Φ2.5 mm. A ring and cross marks are laser engraved on the periphery, and the engraving depth is 0.2 mm for accurate beam positioning. The second main positioning hole group is distributed in a rhombus. The number of main positioning holes in this main positioning hole group is 4. The distance between adjacent main positioning holes is 35.35 mm. The distance from the main positioning hole to the central axis of the main positioning plate 1 is 25 mm. The diameter of the main positioning hole is Φ2.5 mm. A ring and cross marks are laser engraved on the periphery, and the engraving depth is 0.2 mm for accurate beam positioning. By setting 2 main positioning hole groups, 2 kinds of beam spatial angle positioning requirements can be realized on 1 main positioning plate 1, saving costs. Please refer to Figure 3, there are 8 holes distributed on the main positioning plate 1. Among them, 4 side holes arranged in a square are equidistant from the central axis of the main positioning plate 1, forming the first main positioning hole group, which is suitable for spatially angular positioning of 4 laser beams arranged in a square. At this time, the projections of the 4 laser beams on the main positioning plate 1 are in a square shape. 4 holes at the midpoints of the sides of the square and arranged in a rhombus are equidistant from the central axis of the main positioning plate 1, forming the second main positioning hole group, which is suitable for spatially angular positioning of 4 laser beams arranged in a rhombus. At this time, the projections of the 4 laser beams on the main positioning plate 1 are in a rhombus shape. Correspondingly, the secondary positioning plate 2 is also provided with 2 secondary positioning hole groups, which cooperate with the main positioning plate 1 to complete beam positioning. The first group is arranged in a square, with 4 holes. The distance between each hole is 20 mm, the distance from the central axis of the secondary positioning plate 2 is 14.14 mm, the hole diameter is Φ2.5 mm, and a circular ring and a cross mark are laser engraved on the periphery, with an engraving depth of 0.2 mm to facilitate accurate beam positioning. The second group is distributed in a rhombus, with 4 holes. The distance between each hole is 14.14 mm, the distance from the central axis of the secondary positioning plate 2 is 10 mm, the hole diameter is Φ2.5 mm, and a circular ring and a cross mark are laser engraved on the periphery, with an engraving depth of 0.2 mm to facilitate accurate beam positioning.

[0033] Embodiment 2: Based on Embodiment 1, please refer to Figures 1 to 4 , in this embodiment, the main positioning plate 1 and the secondary positioning plate 2 of the multi-beam spatial angle positioning device are slidably arranged on the transverse support rod 3, and a scale ruler 9 is arranged on the surface of the transverse support rod 3. The transverse support rod 3 is used to carry the main positioning plate 1 and the secondary positioning plate 2 and has the function of measuring the distance between the two.

[0034] Specifically, the transverse support rod 3 is characterized by being light in weight, high in strength, and high in rigidity, and can provide more stable support and reduce deformation caused by its own weight.

[0035] Specifically, the transverse support rod 3 can be arranged at the center or other positions of the main positioning plate 1.

[0036] In the multi-beam spatial angle positioning device of this embodiment, please refer to Figures 1 to 4 , through holes are arranged on both the main positioning plate 1 and the secondary positioning plate 2. Fixing blocks 10 are arranged at the through holes, and first locking members with ends abutted against the transverse support rod 3 are arranged on the fixing blocks.

[0037] Further, the diameter of the through hole is slightly larger than the diameter of the transverse support rod 3 to ensure that the main positioning plate 1 and the secondary positioning plate 2 can slide smoothly on the transverse support rod 3. The fixing block 10 is in threaded cooperation with the first locking member. By tightening the first locking member, the end of the first locking member contacts the transverse support rod 3, increasing the frictional force to position and lock the main positioning plate 1 and the secondary positioning plate 2. Loosening the first locking member can adjust the distance between the main positioning plate 1 and the secondary positioning plate 2. This improved design enhances the stability and accuracy of the device, making the operation more convenient and facilitating installation and adjustment.

[0038] Specifically, the contact surface between the fixing block 10 and the transverse support rod 3 is set as a plane to facilitate the close contact between the end of the first locking member and the transverse support rod 3.

[0039] Embodiment Three: Based on Embodiment One, please refer to Figures 1 to 5 , in this embodiment, the transverse support rod 3 of the multi-beam spatial angle positioning device is detachably arranged on the support 6. The bottom of the support 6 is provided with mounting holes, and the support 6 is connected to the optical table through the mounting holes and connecting members.

[0040] Further, the support 6 is characterized by being light in weight and high in strength. Four mounting holes are provided at its bottom, arranged in a rectangular pattern, and it is connected to the optical table through connecting members, enhancing the stability of the device.

[0041] In the multi-beam spatial angle positioning device of this embodiment, please refer to Figures 1 to 5 , a bayonet 11 is provided at the top of the support 6. The bayonet 11 is snap-fitted with the transverse support rod 3 and locked by a second locking member 7.

[0042] Further, the shape of the bayonet 11 is adapted to the bottom shape of the transverse support rod 3. In this embodiment, the bayonet 11 is set as a right-angle structure. A through hole is provided on its first side to facilitate the insertion of the second locking member 7. Its second side extends upward to form a wing edge, and the wing edge and the second side form a limiting fold angle. The limiting fold angle cooperates with the second locking member 7 to improve the stability of the transverse support rod 3.

[0043] Embodiment Four: A method for using a multi-beam spatial angle positioning device, please refer to Figures 1 to 6 , including the following steps: S100. Determine and adjust the distance between the main positioning plate 1 and the secondary positioning plate 2 according to the spatial angle of the laser beam.

[0044] Specifically, the spatial angle of the laser beam is equal to the angle between the line connecting the center of the main positioning hole 4 and the corresponding center of the secondary positioning hole 5 and the central axis of the main positioning plate 1. Set the distance between the main positioning plate 1 and the secondary positioning plate 2 as L, and the spatial angle of the laser beam as θ, then , where is the distance between the main positioning hole 4 and the central axis of the main positioning plate 1, is the distance between the secondary positioning hole 5 and the central axis of the secondary positioning plate 2.

[0045] Place the positioning device at an appropriate position on the optical bench and fix it. Adjust the main positioning plate 1 and the secondary positioning plate 2 to the calculated spacing L according to the scale ruler 9 on the horizontal support rod 3, and lock and fix them.

[0046] S200. Adjust the mirror in the pre-stage optical system so that a laser beam passes through the main positioning hole 4 and the corresponding secondary positioning hole 5 in sequence, complete the spatial angle positioning of the laser beam, and adjust and complete the spatial angle positioning of other laser beams in sequence. Specifically, adjust the mirror in the pre-stage optical system so that the first laser beam passes through the corresponding main positioning hole 4. Then, observe whether the laser beam can pass through the corresponding secondary positioning hole 5. If not, continue to finely adjust the angle of the mirror until the laser beam can precisely pass through the two positioning holes. At this time, the spatial angle of the laser beam has been correctly positioned. In the same way, adjust other laser beams in sequence until all the beams are correctly positioned to achieve precise focusing. During this adjustment process, the center alignment mark 8 can be used to assist in positioning to improve the adjustment accuracy.

[0047] After completing the spatial angle positioning of all laser beams, remove the multi-beam spatial angle positioning device and conduct a formal laser focusing experiment. Since the spatial angles of each laser beam have been precisely positioned, they will be incident from different directions and focused on the same target point, meeting the experimental requirements. By designing main positioning plates 1 and secondary positioning plates 2 with different specifications and adjusting the distance between the two, the multi-beam positioning requirements of different spatial angles can be flexibly met, enhancing the flexibility and applicability of the device, and enabling the multi-beam laser technology to be more widely applied in tabletop or small optomechanical instruments and equipment.

[0048] The following combines the parameter settings of Example 1 to illustrate the implementation process of this usage method: To focus 4 laser beams at a spatial angle of 15° and in a square arrangement on the same target point, in the square arrangement, the distance from the main positioning hole 4 to the central axis of the main positioning plate 1 is 35.35 mm, the distance from the secondary positioning hole 5 to the central axis of the secondary positioning plate 2 is 14.14 mm, and the distance between the main positioning plate 1 and the secondary positioning plate 2 is (35.35 mm - 14.14 mm) / tan15° = 79.16 mm. Therefore, the main positioning plate 1 can be set at the 60 mm scale, and the secondary positioning plate 2 can be set at the 139.16 mm scale. Then, adjust the mirror in the pre-stage optical system to complete the spatial angle positioning adjustment of the 4 beams of light.

[0049] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0050] Optionally, the specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0051] The serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0052] In the above-mentioned embodiments of the present application, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0053] The above are only the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A multi-beam spatial angle positioning device, characterized in that It includes a main positioning plate and a secondary positioning plate arranged coaxially. A number of main positioning holes are provided on the main positioning plate, and the number of the main positioning holes is equal to the number of laser beams. The arrangement shape formed by the number of main positioning holes is the same as the arrangement shape of multiple laser beams focused on the same target point. A number of secondary positioning holes are provided on the secondary positioning plate, and both the number of the secondary positioning holes and the arrangement shape formed by the number of secondary positioning holes are the same as those of the main positioning holes. The distance between the main positioning hole and the central axis of the main positioning plate is greater than the distance between the secondary positioning hole and the central axis of the secondary positioning plate.

2. The multi-beam spatial angle positioning device according to claim 1, characterized in that, The distance between the main positioning plate and the secondary positioning plate is adjustable, so that the same laser beam sequentially passes through the main positioning hole and the secondary positioning hole corresponding to the main positioning hole.

3. The multi-beam spatial angle positioning device according to claim 1, characterized in that, Center alignment marks are provided on the peripheries of both the main positioning hole and the secondary positioning hole.

4. A multi-beam spatial angle positioning device according to claim 1, characterized in that, A number of main positioning hole groups are provided on the main positioning plate, and each main positioning hole group includes a number of main positioning holes, and the shapes of the number of main positioning hole groups are different from each other; A number of secondary positioning hole groups are provided on the secondary positioning plate, and the layout structure of the secondary positioning hole groups is the same as the layout structure of the main positioning hole groups.

5. The multi-beam spatial angle positioning device according to claim 2, characterized in that, The main positioning plate and the secondary positioning plate are slidably arranged on a transverse support rod, and a scale ruler is provided on the surface of the transverse support rod.

6. The multi-beam spatial angle positioning device according to claim 5, wherein Through holes are provided on both the main positioning plate and the secondary positioning plate. Fixing blocks are provided at the through holes, and first locking members with ends abutted against the transverse support rod are provided on the fixing blocks.

7. The multi-beam spatial angle positioning device according to claim 5, characterized in that, The transverse support rod is detachably arranged on a support, mounting holes are provided at the bottom of the support, and the support is connected to an optical table through the mounting holes and connecting members.

8. A multi-beam spatial angle positioning device according to claim 7, characterized in that, A bayonet is provided at the top of the support, and the bayonet is clamped with the transverse support rod and locked by a second locking member.

9. A method of using a multi-beam spatial angle positioning device as described in any one of claims 1-8, characterized in that, It includes the following steps: According to the spatial angle of the laser beam, determine and adjust the distance between the main positioning plate and the secondary positioning plate; Adjust the mirror in the pre-stage optical system so that a laser beam sequentially passes through the main positioning hole and the secondary positioning hole corresponding to the main positioning hole to complete the spatial angle positioning of the laser beam, and sequentially adjust and complete the spatial angle positioning of other laser beams.

10. The method of using a multi-beam spatial angle positioning device according to claim 9, characterized in that, According to the spatial angle of the laser beam, determine and adjust the distance between the main positioning plate and the secondary positioning plate. Specifically: The spatial angle of the laser beam is equal to the included angle between the line connecting the centers of the main positioning hole and the corresponding secondary positioning hole and the central axis of the main positioning plate. The distance between the main positioning plate and the secondary positioning plate is L, and the spatial angle of the laser beam is θ, then , where is the distance between the main positioning hole and the central axis of the main positioning plate, is the distance between the secondary positioning hole and the central axis of the secondary positioning plate.

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