A laser focusing system, a laser welding system and a laser welding machine
By setting up a plane mirror, a P-polarization beam splitter, and a controlled mirror in the laser focusing system, the P-polarization laser beam output by the laser is converted into two optical paths and converged at a preset spatial point outside the XY plane. This solves the problem of complex design of P-polarization laser transmission optical paths and realizes high-precision laser welding control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN OSCOM TECH CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-07-24
AI Technical Summary
When using a P-polarized laser light source for laser focusing, existing technologies struggle to guarantee welding accuracy and control performance. In particular, the complex transmission optical path design of P-polarized lasers makes imaging optical path design difficult, affecting welding control.
By setting up a plane mirror, a P-polarization beam splitter, a first controlled mirror, and a second controlled mirror in the XY plane, the P-polarization laser beam output by the laser is converted into two optical paths and converged at a preset spatial point outside the XY plane. The angle of the optical path is adjusted by using a scanning galvanometer to avoid interference between the imaging optical path and the transmission optical path, thereby improving control accuracy.
This technology enables real-time observation of the laser focusing effect during the laser focusing process, improves the control precision of laser focusing and the stability of the system, and ensures the reliability and accuracy of the welding.
Smart Images
Figure CN224553576U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical confocal technology, and in particular to a laser focusing system, a laser welding system, and a laser welding machine. Background Technology
[0002] To ensure the optical transmission efficiency and quality of the fiber array, a laser fusion splicer is typically used during fabrication to precisely fuse multiple fibers to a large end cap. Considering the precision required for laser fusion splicing, the machine is usually equipped with hardware devices to monitor laser power and focusing parameters at the splice point. These acquired parameters are then used for feedback control based on time or spatial dimensions, thereby improving the reliability and stability of the laser fusion splicing.
[0003] In the optical path design of laser fusion splicers, to ensure the focusing accuracy and efficiency of each laser beam, the transmission optical paths for each laser beam are usually placed on the same plane, and the confocal point of each laser beam is located in the central region of the optical system. However, this design makes it difficult for the hardware device for observing the fusion point to be configured with an imaging optical path that can effectively observe the confocal point of each laser beam, which in turn affects the fusion splicing control effect.
[0004] When using a P-polarized laser light source for fusion splicing, the laser transmission optical path design needs to meet the physical characteristics of P-polarized laser transmission, which makes the corresponding imaging optical path design difficult, making it hard to guarantee fusion accuracy, and increasing the conditions for fusion splicing, such as reducing the maximum diameter that can be effectively fused. Utility Model Content
[0005] The main objective of this application is to provide a laser focusing system, a laser fusion welding system, and a laser fusion welding machine, aiming to solve the technical problem of how to improve the control accuracy of laser focusing when using a light source that outputs P-polarized laser for laser focusing.
[0006] To achieve the above objectives, this application provides a laser focusing system, which includes a laser, a plane mirror, a P-polarization beam splitter, a first controlled mirror, and a second controlled mirror, all disposed in the XY plane.
[0007] The laser is used to emit a preset P-polarized laser beam to the plane mirror;
[0008] The plane mirror is used to reflect the received preset P-polarized laser beam to the P-polarized beam splitter;
[0009] The P-polarization beam splitter is used to transmit and reflect the received preset P-polarization laser beam, transmit the first P-polarization beam formed by transmission to the first controlled mirror, and transmit the second P-polarization beam formed by reflection to the second controlled mirror.
[0010] The first controlled reflector is equipped with a scanning galvanometer for forming a first optical path by reflecting the first P-polarized beam twice, and adjusting the spatial angle of the first optical path based on the control of the scanning galvanometer. The optical path between the two reflections is perpendicular to the XY plane.
[0011] The second controlled reflector is equipped with a scanning galvanometer for forming a second optical path by reflecting the second P-polarized beam twice, and for adjusting the spatial angle of the second optical path based on the control of the scanning galvanometer. The optical path between the two reflections is perpendicular to the XY plane.
[0012] The first optical path and the second optical path converge at a preset spatial point, which is located outside the XY plane.
[0013] In one embodiment, the laser focusing system further includes: a beam expander;
[0014] The beam expander is disposed between the laser and the plane mirror and is used to expand the spot diameter of the preset P-polarized laser beam to a preset diameter.
[0015] In one embodiment, the first controlled reflector includes: a first sub-reflector and a second sub-reflector;
[0016] The first sub-reflector is provided with a first scanning galvanometer, the rotation axis of which is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the first sub-reflector; the second sub-reflector is provided with a second scanning galvanometer, the rotation axis of which is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the second sub-reflector.
[0017] The first sub-reflector is used to reflect the first P-polarized beam to the second sub-reflector at a spatial angle perpendicular to the XY plane;
[0018] The second sub-reflector is used to reflect the first P-polarized beam transmitted by the first sub-reflector to form a first optical path;
[0019] The spatial angle of the first optical path is controlled by the rotation angle of the first scanning mirror and the second scanning mirror.
[0020] In one embodiment, the second controlled reflector includes: a third sub-reflector and a fourth sub-reflector;
[0021] The third sub-reflector is equipped with a third scanning galvanometer, the rotation axis of which is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the third sub-reflector; the fourth sub-reflector is equipped with a fourth scanning galvanometer, the rotation axis of which is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the fourth sub-reflector.
[0022] The third sub-reflector is used to reflect the second P-polarized beam to the fourth sub-reflector at a spatial angle perpendicular to the XY plane;
[0023] The fourth sub-reflector is used to reflect the second P-polarized beam transmitted by the third sub-reflector to form a second optical path;
[0024] The spatial angle of the second optical path is controlled by the rotation angle of the third scanning mirror and the fourth scanning mirror.
[0025] In one embodiment, the angle formed by the projection of the first optical path and the second optical path onto the XY plane is 90°.
[0026] In one embodiment, the first optical path makes an angle of 60° with respect to the vertical direction of the XY plane, and the second optical path makes an angle of 60° with respect to the vertical direction of the XY plane.
[0027] In one embodiment, at the preset spatial point, the optical power provided by the first optical path is equal to the optical power provided by the second optical path.
[0028] In one embodiment, the laser is a carbon dioxide laser, and the preset P-polarized laser beam is a linearly polarized laser.
[0029] To achieve the above objectives, this application also proposes a laser fusion welding system, which includes two laser focusing systems as described above;
[0030] The optical paths formed by the two laser converging systems are mirror-symmetrically arranged in the XY plane, so that each first optical path and each second optical path formed by the laser converging systems converge at the same preset spatial point; the lengths of each first optical path and each second optical path are the same; the optical power provided by each first optical path and the optical power provided by each second optical path received at the preset spatial point are the same; the projections of the transmission paths of each first optical path and each second optical path on the XY plane form a square diagonal distribution shape.
[0031] To achieve the above objectives, this application also proposes a laser fusion welding machine that employs the laser focusing system described above.
[0032] This application provides a laser focusing system, a laser fusion welding system, and a laser fusion welding machine. The laser focusing system includes a laser, a plane mirror, a P-polarized beam splitter, a first controlled mirror, and a second controlled mirror, all disposed in the XY plane. The laser emits a preset P-polarized laser beam to the plane mirror. The plane mirror reflects the received preset P-polarized laser beam to the P-polarized beam splitter. The P-polarized beam splitter transmits and reflects the received preset P-polarized laser beam, transmitting the first P-polarized beam formed by transmission to the first controlled mirror and the second P-polarized beam formed by reflection to the first controlled mirror. Two controlled reflectors; the first controlled reflector is equipped with a scanning galvanometer for forming a first optical path by reflecting the first P-polarized beam twice, and adjusting the spatial angle of the first optical path based on the control of the scanning galvanometer, wherein the optical path between the two reflections is perpendicular to the XY plane; the second controlled reflector is equipped with a scanning galvanometer for forming a second optical path by reflecting the second P-polarized beam twice, and adjusting the spatial angle of the second optical path based on the control of the scanning galvanometer, wherein the optical path between the two reflections is perpendicular to the XY plane; wherein the first optical path and the second optical path converge at a preset spatial point, and the preset spatial point is located outside the XY plane. By using a plane mirror, a P-polarization beam splitter, a first controlled mirror, and a second controlled mirror, all positioned in the same XY plane, the preset P-polarized laser beam emitted by the laser is converted into two optical paths corresponding to the first and second P-polarized beams. These two paths converge at a preset spatial point outside the XY plane. This facilitates the design of an imaging optical path outside the XY plane where the laser transmission optical path is located to observe the convergence of each P-polarized beam, avoiding mutual interference between the laser transmission optical path and the imaging optical path, thereby improving the control accuracy of the convergence of each laser beam. Attached Figure Description
[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0035] Figure 1 This is a schematic diagram of the structure of the laser focusing system according to Embodiment 1 of this application;
[0036] Figure 2 A front view of the structure provided for Embodiment 1 of the laser welding system of this application;
[0037] Figure 3 Left view of the structure provided for Embodiment 1 of the laser welding system of this application;
[0038] Figure 4 Right view of the structure provided for Embodiment 1 of the laser welding system of this application;
[0039] Figure 5 This is a top view of the structure provided in Embodiment 1 of the laser welding system of this application;
[0040] Figure 6 A bottom view of the structure provided for Embodiment 1 of the laser welding system of this application;
[0041] Figure 7 This is a schematic diagram of the overall structure of the laser welding system provided in Embodiment 1 of this application.
[0042] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0043] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.
[0044] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.
[0045] This application presents a laser focusing system according to a first embodiment. Please refer to [link / reference]. Figure 1 The laser focusing system includes: a laser 10, a plane mirror 20, a P-polarization beam splitter 30, a first controlled mirror 41, and a second controlled mirror 42, all disposed in the XY plane;
[0046] The laser 10 is used to emit a preset P-polarized laser beam to the plane mirror 20;
[0047] The plane mirror 20 is used to reflect the received preset P-polarized laser beam to the P-polarized beam splitter 30;
[0048] The P-polarization beam splitter 30 is used to transmit and reflect the received preset P-polarization laser beam, transmit the first P-polarization beam formed by transmission to the first controlled reflector 41, and transmit the second P-polarization beam formed by reflection to the second controlled reflector 42.
[0049] The first controlled reflector 41 is equipped with a scanning galvanometer for forming a first optical path by reflecting the first P-polarized beam twice, and adjusting the spatial angle of the first optical path based on the control of the scanning galvanometer. The optical path between the two reflections is perpendicular to the XY plane.
[0050] The second controlled reflector 42 is equipped with a scanning galvanometer for forming a second optical path by reflecting the second P-polarized beam twice, and adjusting the spatial angle of the second optical path based on the control of the scanning galvanometer. The optical path between the two reflections is perpendicular to the XY plane.
[0051] The first optical path and the second optical path converge at a preset spatial point P, which is located outside the XY plane.
[0052] It should be understood that, please refer to Figure 1 The XY plane refers to a plane defined in three-dimensional space, with the mutually perpendicular X and Y directions serving as two reference directions. Correspondingly, the direction perpendicular to the XY plane can be understood as the Z direction. In this embodiment, the laser 10 can be a light source positioned in the XY plane for outputting a preset P-polarized laser beam. The preset P-polarized laser beam can be a laser beam with specific optical parameters and a P-polarized state. Specifically, the laser 10 can be a semiconductor laser, a solid-state laser, or other types of lasers. The optical parameters of the output preset P-polarized laser beam can be controlled by adjusting its driving parameters. These driving parameters may include driving current intensity, driving current pulse width, pulse frequency, etc., while the corresponding optical parameters may include laser wavelength, beam divergence angle, spot size / shape, optical power, and optical power density, etc.
[0053] It should be noted that the plane mirror 20 is an optical device capable of specular reflection of laser light. In this embodiment, the plane mirror 20 is fixed in the XY plane and positioned in the output light path of the laser 10. It is used to change the spatial angle of the preset P-polarized laser beam in three-dimensional space, so as to meet the transmission characteristics of the preset P-polarized laser beam while minimizing the overall size of the optical system, and ensure that the settings of each optical device in the subsequent laser transmission system can meet the transmission requirements of the P-polarized laser.
[0054] It is easy to understand that the P-polarization beam splitter 30 is an optical device used to distribute and correspondingly split the optical power of a P-polarized laser beam. It can equally divide the optical power of a preset P-polarized laser beam reflected by the plane mirror 20, thereby forming transmitted light with half the optical power and reflected light with half the optical power. The P-polarization beam splitter 30 is also disposed in the XY plane; it only distributes the optical power of the P-polarized light without changing the polarization state of the subsequently formed beam. In this embodiment, the transmitted light refers to the aforementioned first P-polarized beam, and the reflected light refers to the aforementioned second P-polarized beam.
[0055] It should be noted that the first controlled reflector 41 is an optical device capable of secondary reflection of P-polarized light. It contains a scanning galvanometer, which allows for adjustment of the spatial angles of the first and second reflections, resulting in a first optical path with a variable spatial angle while maintaining the same polarization state (P-polarized). Similarly, the second controlled reflector 42 is also an optical device capable of secondary reflection of P-polarized light. It contains a scanning galvanometer, which allows for adjustment of the spatial angles of the first and second reflections, resulting in a second optical path with a variable spatial angle while maintaining the same polarization state (P-polarized).
[0056] It is worth noting that in this embodiment, whether in the first controlled reflector 41 or the second controlled reflector 42, based on the internal hardware structure, the exit angle of the first reflected light is parallel to the Z direction (or can be understood as perpendicular to the XY plane), and the emitted light always falls on the hardware structure that performs the secondary reflection, thus forming a first or second optical path without changing the polarization state. The total optical path lengths of the first P-polarized beam and the second P-polarized beam to the preset spatial point P are equal, and their optical powers at the preset spatial point P are also equal.
[0057] In practical implementation, after the laser focusing system, which is located entirely in the XY plane, is powered on, the laser 10 begins to operate, thereby outputting a preset P-polarized laser beam with specific optical parameters. A plane mirror 20 is fixed in the optical path of the laser 10, reflecting the preset P-polarized laser beam at a spatial angle conforming to the transmission characteristics of P-polarized light onto a P-polarized beam splitter 30. Based on its own physical characteristics, the P-polarized beam splitter 30 performs power distribution and beam splitting on the received preset P-polarized laser beam, transmitting half of the optical power of the preset P-polarized laser beam to form a first P-polarized beam, while reflecting the other half of the optical power of the preset P-polarized laser beam to form a second P-polarized beam. The first controlled reflector 41, under the control of the scanning galvanometer, reflects the first P-polarized beam a second time, forming a first optical path at a corresponding spatial angle without changing its polarization state. At the same time, the second controlled reflector 42, under the control of the scanning galvanometer, reflects the second P-polarized beam a second time, forming a second optical path at another spatial angle without changing its polarization state. Ultimately, the first and second optical paths converge at a preset spatial point P outside the XY plane.
[0058] With this design, the laser transmission optical path is basically set within the XY plane, but the final laser convergence point is set at a preset spatial point P outside the XY plane. In this case, the imaging optical path used to observe the laser convergence effect can be set on a spatial plane parallel to the XY plane at the preset spatial point P. This allows for real-time observation of the laser convergence effect at the preset spatial point P, while ensuring that the optical components and other hardware structures used in the imaging optical path and the laser transmission optical path do not interfere with each other. This helps improve the overall system's control accuracy of laser convergence, thereby enhancing the system's operational stability and reliability.
[0059] Furthermore, in this embodiment, the laser focusing system further includes: a beam expander 50;
[0060] The beam expander 50 is disposed between the laser 10 and the plane mirror 20, and is used to expand the spot diameter of the preset P-polarized laser beam to a preset diameter.
[0061] It should be understood that, according to optical principles, the divergence angle of a light beam is directly proportional to its wavelength and inversely proportional to its spot diameter.
[0062] It is easy to understand that, in this embodiment, a beam expander 50 can be set at the exit port of the laser 10 to increase the spot diameter of the preset P-polarized laser beam by several times, so as to achieve the preset diameter theoretically required by the entire system, and reduce its divergence angle by several times. Ultimately, the laser beam can maintain a small spot size and high energy density after propagating a longer distance, so as to ensure that the laser focused at the preset spatial point P has sufficient power or energy to complete the complete fusion work.
[0063] Furthermore, in this embodiment, the first controlled reflector 41 includes: a first sub-reflector 411 and a second sub-reflector 412;
[0064] The first sub-reflector 411 is provided with a first scanning galvanometer, the rotation axis of the first scanning galvanometer is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the first sub-reflector 411; the second sub-reflector 412 is provided with a second scanning galvanometer, the rotation axis of the second scanning galvanometer is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the second sub-reflector 412.
[0065] The first sub-reflector 411 is used to reflect the first P-polarized beam at a spatial angle perpendicular to the XY plane to the second sub-reflector 412;
[0066] The second sub-reflector 412 is used to reflect the first P-polarized beam transmitted by the first sub-reflector 411 to form a first optical path;
[0067] The spatial angle of the first optical path is controlled by the rotation angle of the first scanning mirror and the second scanning mirror.
[0068] It should be noted that, in this embodiment, the first sub-reflector 411 and the second sub-reflector 412 are used to reflect the first P-polarized beam twice. The incident angle and exit angle of the laser at the first sub-reflector 411 are controlled by the rotation angle of the first scanning galvanometer, and the incident angle and exit angle of the laser at the second sub-reflector 412 are controlled by the rotation angle of the second scanning galvanometer.
[0069] In the optical path formed by the above structure, the rotation axis of the first scanning galvanometer is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point of the first sub-reflector 411. This causes the first sub-reflector 411 to reciprocate under the control of the first scanning galvanometer, and its outgoing light scans back and forth in the first sector plane. The first scanning galvanometer scans a straight line rather than an arc. Similarly, the rotation axis of the second scanning galvanometer is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point of the second sub-reflector 412. This causes the second sub-reflector 412 to reciprocate under the control of the second scanning galvanometer, and its outgoing light scans back and forth in the second sector plane. The second scanning galvanometer scans a straight line rather than an arc. Thus, when the first sub-reflector 411 rotates, the angle formed by the first optical path and the XY plane in the first preset direction can be controlled; and when the second sub-reflector 412 rotates, the angle formed by the first optical path and the XY plane in the second preset direction can be controlled. This allows adjustment of the spatial angle of the first optical path, thereby adjusting the spatial position of the preset spatial point P formed by the actual convergence of the first and second optical paths. The first preset direction and the second preset direction are two directions that are perpendicular to each other in the XY plane.
[0070] It is worth noting that in this embodiment, the first P-polarized beam emitted from the first sub-reflector 411 to the second sub-reflector 412 remains perpendicular to the XY plane, so that the polarization state of the transmitted first P-polarized beam does not change after secondary reflection.
[0071] Furthermore, in this embodiment, the second controlled reflector 42 includes: a third sub-reflector 421 and a fourth sub-reflector 422;
[0072] The third sub-reflector 421 is provided with a third scanning galvanometer, the rotation axis of which is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the third sub-reflector 421; the fourth sub-reflector 422 is provided with a fourth scanning galvanometer, the rotation axis of which is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the fourth sub-reflector 422.
[0073] The third sub-reflector 421 is used to reflect the second P-polarized beam to the fourth sub-reflector 422 at a spatial angle perpendicular to the XY plane.
[0074] The fourth sub-reflector 422 is used to reflect the second P-polarized beam transmitted by the third sub-reflector 421 to form a second optical path;
[0075] The spatial angle of the second optical path is controlled by the rotation angle of the third scanning mirror and the fourth scanning mirror.
[0076] It is easy to understand that, similar to the case of the first controlled reflector 41 described above, in this embodiment, the third sub-reflector 421 and the fourth sub-reflector 422 are used to reflect the second P-polarized beam twice. The incident and exit angles of the laser at the third sub-reflector 421 are controlled by the rotation angle of the third scanning galvanometer, and the incident and exit angles of the laser at the fourth sub-reflector 422 are controlled by the rotation angle of the fourth scanning galvanometer.
[0077] In the optical path formed by the above structure, the rotation axis of the third scanning galvanometer is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point of the third sub-reflector 421, causing the third sub-reflector 421 to reciprocate under the control of the third scanning galvanometer, and its outgoing light to scan back and forth in the third sector plane. The third scanning galvanometer scans a straight line instead of an arc. The rotation axis of the fourth scanning galvanometer is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point of the fourth sub-reflector 422, causing the fourth sub-reflector 422 to reciprocate under the control of the fourth scanning galvanometer, and its outgoing light to scan back and forth in the fourth sector plane. The fourth scanning galvanometer scans a straight line instead of an arc. Thus, when the third sub-reflector 421 rotates, the angle formed by the second light path and the XY plane in the first preset direction can be controlled; and when the fourth sub-reflector 422 rotates, the angle formed by the second light path and the XY plane in the second preset direction can be controlled, thereby adjusting the spatial angle of the second light path, and thus adjusting the spatial position of the preset spatial point P formed by the actual convergence with the first light path.
[0078] It is worth noting that in this embodiment, the second P-polarized beam emitted from the third sub-reflector 421 to the fourth sub-reflector 422 remains perpendicular to the XY plane, so that the transmitted second P-polarized beam does not change its polarization state after secondary reflection.
[0079] Furthermore, in this embodiment, the angle formed by the projection of the first optical path and the second optical path onto the XY plane is 90°.
[0080] It should be noted that in this embodiment, other optical hardware structures with the same or different functions can also be set in the XY plane, so that the projections of the first optical path and the second optical path on the XY plane are set at 90°. This means that other hardware structures can be set in the other 270° area of the XY plane, which is convenient for subsequent system function expansion or iterative upgrades.
[0081] Furthermore, in this embodiment, the first optical path makes an angle of 60° with respect to the vertical direction of the XY plane, and the second optical path makes an angle of 60° with respect to the vertical direction of the XY plane.
[0082] It should be noted that, in this embodiment, the angle between the first optical path and the second optical path and the perpendicular direction (Z direction) of the XY plane is 60°. This ensures that the preset spatial point P formed by their convergence is sufficiently far from the XY plane, facilitating the setup of the imaging system. Furthermore, it also prevents the preset spatial point P from being too far from the XY plane, thus ensuring the control accuracy of laser convergence and preventing excessive power attenuation during laser transmission.
[0083] Furthermore, in this embodiment, at the preset spatial point P, the optical power provided by the first optical path is equal to the optical power provided by the second optical path.
[0084] It is easy to understand that, in this embodiment, in the above optical structure, the P-polarization beam splitter 30 divides the optical power of the preset P-polarization laser beam emitted from the laser 10 into equal parts, thereby forming a first P-polarization beam and a second P-polarization beam with equal initial optical power. Based on the control of the first controlled reflector 41 and the second controlled reflector 42, the optical path length of the first P-polarization beam to the preset spatial point P and the optical path length of the second P-polarization beam to the preset spatial point P can be kept consistent, that is, the attenuation degree during their transmission remains the same. Therefore, at the preset spatial point P, the optical power received by the first optical path remains the same as the optical power received by the second optical path.
[0085] Furthermore, in this embodiment, the laser 10 is a carbon dioxide laser 10, and the preset P-polarized laser beam is a linearly polarized laser.
[0086] It is easy to understand that in this embodiment, the laser 10 can specifically be a carbon dioxide laser 10, whose output preset P-polarized laser beam is a linearly polarized laser, and the installation direction of the laser 10 is such that the linearly polarized laser reaches the P-polarized beam splitter 30 at the incident angle of the P-polarized laser.
[0087] This application proposes a laser focusing system. The laser focusing system uses a plane mirror, a P-polarization beam splitter, a first controlled mirror, and a second controlled mirror arranged in the same XY plane to convert a preset P-polarized laser beam emitted by a laser into two optical paths corresponding to the P-polarized beams, a first optical path and a second optical path, and to converge the two beams to a preset spatial point outside the XY plane. This facilitates the design of an imaging optical path outside the XY plane where the laser transmission optical path is located to observe the convergence of each P-polarized beam, avoiding mutual interference between the laser transmission optical path and the imaging optical path, thereby improving the control accuracy of the convergence of each laser beam.
[0088] Furthermore, to achieve the above objectives, this application also provides a laser fusion welding system, please refer to... Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 as well as Figure 7 The laser fusion system includes two laser focusing systems as described above.
[0089] The optical paths formed by the two laser converging systems are mirror-symmetrically arranged in the XY plane, so that each first optical path and each second optical path formed by the laser converging systems converge at the same preset spatial point P; the lengths of each first optical path and each second optical path are the same; the optical power provided by each first optical path and the optical power provided by each second optical path received at the preset spatial point P are the same; the projection of the transmission paths of each first optical path and each second optical path on the XY plane forms a square diagonal distribution shape.
[0090] It should be noted that the preset spatial point P can also be understood as the area to be heated (the fusion center area) in the laser fusion splicing system, used to fusion several optical fibers to the end cap. In this embodiment, the laser fusion splicing system can be specifically applied in a laser fusion splicer, including two laser focusing systems as described above. In each laser focusing system, the laser 10, beam expander 50, plane mirror 20, P-polarization beam splitter 30, first controlled mirror 41, and second controlled mirror 42 are all located in the XY plane, and the optical paths formed by the two systems are mirror-symmetrically arranged. This allows the first and second optical paths formed by one laser focusing system to converge with the first and second optical paths formed by the other laser focusing system at the same preset spatial point P, thereby achieving essentially 360° (relative to the plane angle in the XY plane) laser focusing at the preset spatial point P, enabling uniform fusion work at that point.
[0091] It is worth noting that, in this embodiment, for any single laser converging system, the angle between the projections of the first and second optical paths onto the XY plane is 90°. For two laser converging systems, the angle between the projections of the two first optical paths onto the XY plane is also 90°. This means that the projections of the two first and two second optical paths onto the XY plane can form a diagonal distribution in a positive direction. This ensures that the optical path lengths of the two first and two second optical paths formed by the two laser converging systems are the same, and their power attenuation during transmission is also the same. Simultaneously, the initial optical power of the preset P-polarized laser beams output by the lasers 10 of the two laser converging systems should also remain the same. This ensures that the optical power received around the preset spatial point P (relative to the plane angle in the XY plane) is the same, resulting in the same heating. This reduces the occurrence of weld misalignment due to uneven heat distribution during the welding process, thus improving welding accuracy. Furthermore, during the fusion process, since the preset spatial point P is set far away from the XY plane, imaging optical paths for observing the convergence effect can be set around it (relative to the plane angle in the XY plane). These paths will not interfere with the laser imaging optical paths located in the XY plane, thereby improving the control accuracy of laser convergence and further enhancing the fusion accuracy.
[0092] This application proposes a laser fusion splicing system that can split a P-polarized laser into four P-polarized beams with equal optical power outside the XY plane where the laser transmission optical path is located, and then uniformly converge them to a preset spatial point. While ensuring more uniform optical power in all spatial directions at the preset spatial point, it also facilitates the setting of an imaging optical path around the preset spatial point for observing the laser focusing effect. This prevents the plane of the imaging optical path from interfering with the plane of the laser transmission optical path, thereby improving the control accuracy of laser focusing.
[0093] In addition, to achieve the above objectives, this application also provides a laser welding machine, which employs the laser welding system described above.
[0094] The laser fusion splicer provided in this application, employing the laser fusion splicing system described in the above embodiments, can also solve the technical problem of improving the control accuracy of laser focusing when using a P-polarized laser light source for laser focusing. Compared with the prior art, the beneficial effects of the laser fusion splicer provided in this application are the same as those of the laser fusion splicing system provided in the above embodiments, and other technical features in the laser fusion splicer are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.
[0095] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent scope of this application.
Claims
1. A laser focusing system, characterized in that, The laser focusing system includes: a laser, a plane mirror, a P-polarization beam splitter, a first controlled mirror, and a second controlled mirror, all disposed in the XY plane; The laser is used to emit a preset P-polarized laser beam to the plane mirror; The plane mirror is used to reflect the received preset P-polarized laser beam to the P-polarized beam splitter; The P-polarization beam splitter is used to transmit and reflect the received preset P-polarization laser beam, transmit the first P-polarization beam formed by transmission to the first controlled mirror, and transmit the second P-polarization beam formed by reflection to the second controlled mirror. The first controlled reflector is equipped with a scanning galvanometer for forming a first optical path by reflecting the first P-polarized beam twice, and adjusting the spatial angle of the first optical path based on the control of the scanning galvanometer. The optical path between the two reflections is perpendicular to the XY plane. The second controlled reflector is equipped with a scanning galvanometer for forming a second optical path by reflecting the second P-polarized beam twice, and based on the control of the scanning galvanometer, the spatial angle of the second optical path is such that the optical path between the two reflections is perpendicular to the XY plane; The first optical path and the second optical path converge at a preset spatial point, which is located outside the XY plane.
2. The laser focusing system as described in claim 1, characterized in that, The laser focusing system also includes: a beam expander; The beam expander is disposed between the laser and the plane mirror and is used to expand the spot diameter of the preset P-polarized laser beam to a preset diameter.
3. The laser focusing system as described in claim 1, characterized in that, The first controlled reflector includes: a first sub-reflector and a second sub-reflector; The first sub-reflector is provided with a first scanning galvanometer, the rotation axis of which is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the first sub-reflector; the second sub-reflector is provided with a second scanning galvanometer, the rotation axis of which is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the second sub-reflector. The first sub-reflector is used to reflect the first P-polarized beam to the second sub-reflector at a spatial angle perpendicular to the XY plane; The second sub-reflector is used to reflect the first P-polarized beam transmitted by the first sub-reflector to form a first optical path; The spatial angle of the first optical path is controlled by the rotation angle of the first scanning mirror and the second scanning mirror.
4. The laser focusing system as described in claim 1, characterized in that, The second controlled reflector includes: a third sub-reflector and a fourth sub-reflector; The third sub-reflector is equipped with a third scanning galvanometer, the rotation axis of which is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the third sub-reflector; the fourth sub-reflector is equipped with a fourth scanning galvanometer, the rotation axis of which is perpendicular to the plane formed by the incident light and the outgoing light corresponding to the reflection point on the fourth sub-reflector. The third sub-reflector is used to reflect the second P-polarized beam to the fourth sub-reflector at a spatial angle perpendicular to the XY plane; The fourth sub-reflector is used to reflect the second P-polarized beam transmitted by the third sub-reflector to form a second optical path; The spatial angle of the second optical path is controlled by the rotation angle of the third scanning mirror and the fourth scanning mirror.
5. The laser focusing system as described in claim 1, characterized in that, The angle formed by the projection of the first optical path and the second optical path onto the XY plane is 90°.
6. The laser focusing system as described in claim 1, characterized in that, The first optical path makes an angle of 60° with respect to the vertical direction of the XY plane, and the second optical path makes an angle of 60° with respect to the vertical direction of the XY plane.
7. The laser focusing system as described in claim 1, characterized in that, At the preset spatial point, the optical power provided by the first optical path is equal to the optical power provided by the second optical path.
8. The laser focusing system as described in claim 1, characterized in that, The laser is a carbon dioxide laser, and the preset P-polarized laser beam is a linearly polarized laser.
9. A laser fusion welding system, characterized in that, The laser welding system includes two laser focusing systems as described in any one of claims 1 to 8; The optical paths formed by the two laser converging systems are mirror-symmetrically arranged in the XY plane, so that each first optical path and each second optical path formed by the laser converging systems converge at the same preset spatial point; the lengths of each first optical path and each second optical path are the same; the optical power provided by each first optical path and the optical power provided by each second optical path received at the preset spatial point are the same; the projections of the transmission paths of each first optical path and each second optical path on the XY plane form a square diagonal distribution shape.
10. A laser welding machine, characterized in that, The laser welding machine uses the laser welding system as described in claim 9.