Laser light path system and laser welding machine
By designing a laser optical path system in a laser fusion machine and utilizing the symmetrical distribution of the S-polarization beam splitter and the reflector group, the structural interference problem during laser focusing was solved, thereby improving the fusion accuracy and efficiency and enhancing the utilization rate of laser power.
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
In existing laser fusion welding machines, the mounting components are prone to interference when the S-polarized laser converges, affecting the welding accuracy and efficiency. In particular, when the output S-polarized laser is converted to P-polarized laser, the imaging optical path design becomes more difficult, resulting in a smaller maximum weldable diameter.
A laser optical path system is adopted, including a laser, first to third S-polarization beam splitters and first to fourth plane mirror groups. The laser, beam splitters and mirror groups are in the same XY plane. The projection points of the reflection points on the XY plane are symmetrically distributed. The laser converges at the fusion center outside the XY plane to avoid interference.
It improves the control precision of laser focusing, ensures that each laser path is installed independently, enhances the fusion control effect, improves laser power utilization, and reduces the impact of reflected stray light.
Smart Images
Figure CN224553573U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optical path design technology, and in particular to a laser optical path system and a laser fusion splicer. Background Technology
[0002] 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 typically placed on the same plane, with the confocal point of each laser beam located in the central region of the optical system. From a structural design perspective, the laser optical path needs to house core components such as a high-power laser emitter, a mirror assembly, and a focusing lens, while the imaging optical path requires monitoring components such as filters and imaging lenses. When arranged on the same plane, the mounting positions of these components inevitably overlap; for example, the mounting base of the focusing lens may physically interfere with the adjustment bracket of the imaging lens. This design makes it difficult to set up an imaging optical path that can effectively observe the confocal point of each laser beam, thus negatively impacting the fusion splicing control effect.
[0003] When using an S-polarized laser source for welding, to ensure welding quality, the S-polarized laser needs to be converted into a P-polarized laser with higher transmittance before focusing. Because the laser transmission optical path design must meet the physical characteristics of both S-polarized and P-polarized laser transmission, the corresponding imaging optical path design becomes more difficult, making it harder to guarantee welding accuracy and increasing the conditions for successful welding, such as reducing the maximum diameter suitable for effective welding.
[0004] The above content is only used to help understand the technical solution of this utility model and does not represent an admission that the above content is prior art. Utility Model Content
[0005] The main purpose of this invention is to provide a laser optical path system and a laser fusion machine, which aims to solve the technical problem of how to avoid mutual interference when installing structural components during the convergence of S-polarized lasers in the prior art.
[0006] To achieve the above objectives, this utility model proposes a laser optical path system, which includes: a laser, first to third S-polarization beam splitters, and first to fourth plane mirror groups;
[0007] The first S-polarization beam splitter is used to split the laser emitted from the laser to generate a transmitted first laser beam and a reflected second laser beam, and to transmit the first laser beam to the second S-polarization beam splitter and the second laser beam to the third S-polarization beam splitter.
[0008] The second S-polarization beam splitter is used to split the first laser beam to generate a transmitted third laser beam and a reflected fourth laser beam, transmit the third laser beam to the first plane mirror, and transmit the fourth laser beam to the second plane mirror.
[0009] The third S-polarization beam splitter is used to split the second laser beam to generate a transmitted fifth laser beam and a reflected sixth laser beam. The fifth laser beam is transmitted to the third plane mirror, and the sixth laser beam is transmitted to the fourth plane mirror.
[0010] The first to fourth planar reflectors are used to reflect and converge the third to sixth laser beams to the fusion center to form the first to fourth optical paths;
[0011] The laser, the first to third S-polarization beam splitters, and the first to fourth planar reflector groups all share the XY plane. The fusion center is located outside the XY plane, and the projection points of the reflection points of the first to fourth planar reflector groups on the XY plane are symmetrically distributed with respect to the fusion center.
[0012] Optionally, each of the first to fourth reflector groups includes: a first plane reflector and a second plane reflector;
[0013] Each of the first planar reflectors and each of the second planar reflectors are located in the XY plane;
[0014] Each of the first planar reflectors is used to reflect the third laser beam to the sixth laser beam along the XY plane to the corresponding second planar reflector. The light rays from the third laser beam to the sixth laser beam are reflected by each of the first planar reflectors and then converge at the fusion center after being extended in the opposite direction.
[0015] Each of the second planar reflectors is used to converge the third to the sixth laser beams at the fusion center to form the first to fourth optical paths.
[0016] Optionally, the first to fourth optical paths formed by the convergence of each of the second planar reflectors at the fusion center each form a 60-degree angle with the Z-axis direction.
[0017] Optionally, the first laser beam and the second laser beam are both S-polarized, with their polarization direction perpendicular to the XY plane, and the third to the sixth laser beams are all P-polarized, with their polarization direction parallel to the XY plane.
[0018] Optionally, each of the second planar reflectors is configured as a cylindrical reflector.
[0019] Optionally, the laser optical path system further includes: a third plane mirror;
[0020] The third planar reflector is located in the XY plane;
[0021] The third planar reflector is used to reflect the laser emitted from the laser back to the first S-polarization beam splitter.
[0022] Optionally, the laser optical path system further includes: a fourth plane mirror and a fifth plane mirror;
[0023] Both the fourth and fifth plane mirrors are located in the XY plane;
[0024] The fourth plane mirror is used to reflect the first laser beam transmitted through the first S-polarization beam splitter back to the second S-polarization beam splitter.
[0025] The fifth planar reflector is also used to reflect the second laser beam reflected by the first S-polarization beam splitter to the third S-polarization beam splitter.
[0026] Optionally, both the fourth and fifth planar reflectors are configured as cylindrical reflectors.
[0027] Optionally, the laser emitted by the laser travels the same distance to the fusion center through the first to fourth optical paths.
[0028] In addition, to achieve the above objectives, this utility model also provides a laser welding machine, which includes the laser optical path system as described above.
[0029] This invention provides a laser optical path system and a laser fusion splicer. The laser optical path system includes: a laser, first to third S-polarization beam splitters, and first to fourth plane mirror groups. The first S-polarization beam splitter is used to split the laser emitted from the laser to generate a transmitted first laser beam and a reflected second laser beam. The first laser beam is transmitted to the second S-polarization beam splitter, and the second laser beam is transmitted to the third S-polarization beam splitter. The second S-polarization beam splitter is used to split the first laser beam to generate a transmitted third laser beam and a reflected fourth laser beam. The third laser beam is transmitted to the first plane mirror, and the fourth laser beam is transmitted to the second plane mirror. A three-S polarization beam splitter is used to split the second laser beam, generating a transmitted fifth laser beam and a reflected sixth laser beam. The fifth laser beam is transmitted to a third plane mirror, and the sixth laser beam is transmitted to a fourth plane mirror. The first to fourth plane mirrors reflect and converge the third to sixth laser beams at the fusion center, forming the first to fourth optical paths. The laser, the first to third S polarization beam splitters, and the first to fourth plane mirror groups all share an XY plane. The fusion center is located outside the XY plane, and the projection points of the reflection points of the first to fourth plane mirror groups on the XY plane are symmetrically distributed relative to the fusion center. The laser emitted from the laser is split by the first to third S polarization beam splitters located in the same XY plane, and then reflected and converged by the first to fourth plane mirror groups, also located in the XY plane, at the fusion center outside the XY plane, forming the first to fourth optical paths. The projection points of the reflection points of the first to fourth plane mirror groups on the XY plane are symmetrically distributed relative to the fusion center. Because the laser optical path design is almost not coplanar with the fusion center, the laser optical path and the imaging optical path on the plane where the fusion center is located will not interfere with each other. This allows for the convenient design of their respective installation structures and improves the control accuracy of laser convergence. Attached Figure Description
[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of the structure of the first embodiment of the laser optical path system of this utility model;
[0032] Figure 2 This is a schematic diagram of the second embodiment of the laser optical path system of this utility model;
[0033] Figure 3 This is a front view of the structure of the second embodiment of the laser optical path system of this utility model;
[0034] Figure 4 This is a left view of the structure of the second embodiment of the laser optical path system of this utility model;
[0035] Figure 5 This is a right view of the structure of the second embodiment of the laser welding system of this utility model;
[0036] Figure 6 This is a top view of the structure of the second embodiment of the laser optical path system of this utility model;
[0037] Figure 7 This is a bottom view of the structure of the second embodiment of the laser optical path system of this utility model.
[0038] Explanation of reference numerals: 10, Laser; 201, First S-polarization beam splitter; 202, Second S-polarization beam splitter; 203, Third S-polarization beam splitter; 301, First mirror group; 302, Second mirror group; 303, Third mirror group; 304, Fourth mirror group; 40, Fusion center; 50, First plane mirror; 60, Second plane mirror; 70, Third plane mirror; 80, Fourth plane mirror; 90, Fifth plane mirror.
[0039] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0040] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0042] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0043] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.
[0044] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the laser optical path system of this utility model, as shown below. Figure 1 As shown, in this embodiment, the laser optical path system includes: a laser, first to third P-polarization beam splitters, and first to fourth reflector groups.
[0045] It should be noted that the first S-polarization beam splitter can be used to split the laser emitted from the laser, generating a transmitted first laser beam and a reflected second laser beam. The first laser beam is transmitted to the second S-polarization beam splitter, and the second laser beam is transmitted to the third P-polarization beam splitter. The second S-polarization beam splitter can be used to split the first laser beam, generating a transmitted third laser beam and a reflected fourth laser beam. The third laser beam is transmitted to the first reflector group, and the fourth laser beam is transmitted to the second reflector group. The third P-polarization beam splitter can be used to split the second laser beam, generating a transmitted fifth laser beam and a reflected sixth laser beam. The fifth laser beam is transmitted to the reflector group, and the sixth laser beam is transmitted to the fourth reflector group. The first to fourth reflector groups can be used to reflect and converge the third to sixth laser beams at the fusion center, forming the first to fourth optical paths.
[0046] It should be understood that the laser can be a carbon dioxide laser, used as a heat source to output carbon dioxide laser light, which is linearly polarized. The first to third S-polarization beam splitters can split the incident light into two beams of equal power; one beam is transmitted with its direction unchanged, while the other is reflected at 90°. For an S-polarization beam splitter, power splitting can only be achieved if the incident light is S-polarized, ensuring both transmitted and reflected light are S-polarized. Therefore, the laser's installation direction can ensure that the linearly polarized light reaches the S-polarization beam splitter in accordance with S-polarization incidence. The first to fourth reflecting mirror groups can be optical components composed of plane mirrors that reflect and converge the laser beam at the fusion center. The laser beam forms the first to fourth optical paths converging at the fusion center through the first to fourth reflecting mirror groups, respectively.
[0047] Specifically, the S-polarized laser generated by the laser is split into a first transmitted laser beam and a second laser beam reflected at 90° by the first S-polarization beam splitter. The first and second laser beams have equal power and are both P-polarized light. The first laser beam enters the second S-polarization beam splitter and is further split into a third transmitted laser beam and a fourth laser beam reflected at 90°. The third and fourth laser beams have equal power and are both P-polarized light. Similarly, the second laser beam enters the third S-polarization beam splitter and is further split into a fifth transmitted laser beam and a sixth laser beam reflected at 90°. The fifth and sixth laser beams have equal power. The third, fourth, fifth, and sixth laser beams are then converged at the fusion center by the first to fourth sets of reflecting mirrors, respectively.
[0048] The laser, the first to third S-polarizing beam splitters, and the first to fourth planar reflector groups all share the XY plane. The fusion center is located outside the XY plane, and the projection points of the reflection points of the first to fourth reflector groups on the XY plane are symmetrically distributed with respect to the fusion center. The first and second laser beams are both S-polarized, with their polarization direction perpendicular to the XY plane, while the third to sixth laser beams are all P-polarized, with their polarization direction parallel to the XY plane.
[0049] It should be noted that, since the projection points of the reflection points of the first to fourth reflector groups on the XY plane are symmetrically distributed with respect to the fusion center, the distances from the laser's output port to the fusion center through the first to fourth optical paths are all equal, and the incident and exit angles on the corresponding reflectors are also the same, ensuring complete consistency. This guarantees that the optical path lengths of the four laser beams reaching the fusion center are equal, resulting in consistent performance. Furthermore, the four laser beams converging at the fusion center all have P-polarization relative to the XY plane.
[0050] In this embodiment, the laser optical path system includes: a laser, first to third S-polarization beam splitters, and first to fourth plane mirror groups; the first S-polarization beam splitter is used to split the laser emitted from the laser to generate a transmitted first laser beam and a reflected second laser beam, transmitting the first laser beam to the second S-polarization beam splitter and the second laser beam to the third S-polarization beam splitter; the second S-polarization beam splitter is used to split the first laser beam to generate a transmitted third laser beam and a reflected fourth laser beam, transmitting the third laser beam to the first plane mirror and the fourth laser beam to the second plane mirror; the third S-polarization beam splitter is used to... The second laser beam is split to generate a transmitted fifth laser beam and a reflected sixth laser beam. The fifth laser beam is transmitted to a third plane mirror, and the sixth laser beam is transmitted to a fourth plane mirror. The first to fourth plane mirrors reflect and converge the third to sixth laser beams at the fusion center, forming the first to fourth optical paths. The laser, the first to third S-polarization beam splitters, and the first to fourth plane mirror groups all share the same XY plane. The fusion center is located outside the XY plane, and the projection points of the reflection points of the first to fourth plane mirror groups on the XY plane are symmetrically distributed relative to the fusion center. The laser emitted from the laser is split by the first to third S-polarization beam splitters located in the same XY plane, and then reflected and converged by the first to fourth plane mirror groups, also located in the XY plane, at the fusion center outside the XY plane, forming the first to fourth optical paths. The projection points of the reflection points of the first to fourth plane mirror groups on the XY plane are symmetrically distributed relative to the fusion center. Because the laser optical path design is almost not coplanar with the fusion center, the laser optical path and the imaging optical path on the plane where the fusion center is located will not interfere with each other. This allows for the convenient design of their respective installation structures and improves the control accuracy of laser convergence.
[0051] Reference Figure 2 , Figure 2 This is a schematic diagram of the second embodiment of the laser optical path system of this utility model, as shown below. Figure 2 As shown, in this embodiment, the contents that are the same as or similar to those in the first embodiment described above can be referred to the above description and will not be repeated hereafter. Each of the first to fourth reflector groups includes: a first plane reflector and a second plane reflector, and each of the first plane reflector and each of the second plane reflectors is located in the XY plane.
[0052] It should be noted that each of the first planar reflectors is used to reflect the third to the sixth laser beams along the XY plane to the corresponding second planar reflector. The light rays of the third to the sixth laser beams reflected by each of the first planar reflectors are extended in the reverse direction and converge at the fusion center. Each of the second planar reflectors is used to converge the third to the sixth laser beams at the fusion center to form the first to fourth optical paths.
[0053] It should be understood that, since the aforementioned laser and the first to third S-polarization beam splitters share the same XY plane, and each of the first plane mirrors and the third plane mirror are also located in the XY plane, in order to ensure that the fusion center is not in the XY plane, the light reflected by each first plane mirror needs to be extended in the reverse direction and converge to the projection of the fusion center on the XY plane, so that the third to sixth laser beams converge at the fusion center. Simultaneously, to ensure that the optical path lengths of the four laser beams reaching the fusion center are equal and the effect is consistent, the second plane mirror and each of the first plane mirrors are correspondingly positioned at the same distance along the direction parallel to the Z-axis. This causes the third to sixth laser beams to all convert from S-polarization to P-polarization, and the polarization direction of the laser beams is parallel to the XY plane.
[0054] Specifically, the first to fourth optical paths formed by the convergence of each of the second planar reflectors at the fusion center all form a 60-degree angle with the Z-axis. According to optical theory, compared to laser light acting perpendicularly to the XY plane, P-polarized laser light with a 60-degree angle to the Z-axis has higher transmittance (i.e., higher laser absorptivity) and lower reflectivity when heating the front end face of the end cap parallel to the XY plane, thereby improving laser power utilization while reducing the influence of reflected stray light.
[0055] Furthermore, the laser optical path system may further include a third plane mirror. The third plane mirror is located in the XY plane. The third plane mirror can be used to reflect the laser beam emitted from the laser back to the first S-polarizing beam splitter. Similarly, the laser optical path system may also include a fourth plane mirror and a fifth plane mirror; both the fourth and fifth plane mirrors are located in the XY plane; the fourth plane mirror can be used to reflect the first laser beam transmitted through the first P-polarizing beam splitter back to the second S-polarizing beam splitter; the fifth plane mirror can be used to reflect the second laser beam reflected by the first S-polarizing beam splitter back to the third S-polarizing beam splitter. By using plane mirrors, the laser direction can be changed, optimizing the overall system size design.
[0056] Reference Figures 3 to 7 . Figure 3This is a front view of the structure of the second embodiment of the laser optical path system of this utility model; Figure 4 This is a left view of the structure of the second embodiment of the laser optical path system of this utility model; Figure 5 This is a right view of the structure of the second embodiment of the laser welding system of this utility model; Figure 6 This is a top view of the structure of the second embodiment of the laser optical path system of this utility model; Figure 7 This is a bottom view of the structure of the second embodiment of the laser optical path system of this utility model.
[0057] It should be noted that the fourth and fifth plane mirrors can be replaced with cylindrical mirrors. Cylindrical mirrors can perform one-dimensional focusing of the laser, converging a circular spot into an elliptical spot, thereby increasing the laser power density without reducing the laser heating range. Alternatively, the four second plane mirrors can be replaced with cylindrical mirrors with shorter focal lengths to further improve the laser power density.
[0058] In this embodiment, the first to fourth reflector groups of the laser optical path system each include a first plane mirror and a second plane mirror. A third plane mirror located in the XY plane also reflects the laser emitted from the laser to the first S-polarization beam splitter. The fourth and fifth plane mirrors, also located in the XY plane, reflect the first laser beam transmitted through the first S-polarization beam splitter to the second S-polarization beam splitter, and reflect the second laser beam reflected by the first S-polarization beam splitter to the third S-polarization beam splitter. Each of the first and second plane mirrors is located outside the XY plane. This ensures that the laser emitted from the laser travels equidistantly through the first to fourth optical paths, converging at the fusion center into four laser beams with a P-polarized state relative to the XY plane. Simultaneously, the first to fourth optical paths all form a 60-degree angle with the Z-axis direction, improving laser power utilization while reducing the influence of reflected stray light.
[0059] The above are merely preferred embodiments of this utility model and do not limit the scope of protection of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the scope of protection of this utility model.
[0060] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0061] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0062] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.
Claims
1. A laser optical path system, characterized in that, The laser optical path system includes: a laser, first to third S-polarization beam splitters, and first to fourth plane mirror groups; The first S-polarization beam splitter is used to split the laser emitted from the laser to generate a transmitted first laser beam and a reflected second laser beam, and to transmit the first laser beam to the second S-polarization beam splitter and the second laser beam to the third S-polarization beam splitter. The second S-polarization beam splitter is used to split the first laser beam to generate a transmitted third laser beam and a reflected fourth laser beam, transmit the third laser beam to the first plane mirror, and transmit the fourth laser beam to the second plane mirror. The third S-polarization beam splitter is used to split the second laser beam to generate a transmitted fifth laser beam and a reflected sixth laser beam. The fifth laser beam is transmitted to the third plane mirror, and the sixth laser beam is transmitted to the fourth plane mirror. The first to fourth planar reflectors are used to reflect and converge the third to sixth laser beams to the fusion center to form the first to fourth optical paths; The laser, the first to third S-polarization beam splitters, and the first to fourth planar reflector groups all share the XY plane. The fusion center is located outside the XY plane, and the projection points of the reflection points of the first to fourth planar reflector groups on the XY plane are symmetrically distributed with respect to the fusion center.
2. The laser optical path system as described in claim 1, characterized in that, The first to fourth reflector groups each include: a first plane reflector and a second plane reflector; Each of the first planar reflectors and each of the second planar reflectors are located in the XY plane; Each of the first planar reflectors is used to reflect the third laser beam to the sixth laser beam along the XY plane to the corresponding second planar reflector. The light rays from the third laser beam to the sixth laser beam are reflected by each of the first planar reflectors and then converge at the fusion center after being extended in the opposite direction. Each of the second planar reflectors is used to converge the third to the sixth laser beams at the fusion center to form the first to fourth optical paths.
3. The laser optical path system as described in claim 2, characterized in that, The first to fourth optical paths formed by the convergence of each of the second planar reflectors at the fusion center each form a 60-degree angle with the Z-axis direction.
4. The laser optical path system as described in claim 3, characterized in that, The first laser beam and the second laser beam are both S-polarized, with their polarization direction perpendicular to the XY plane. The third to the sixth laser beams are all P-polarized, with their polarization direction parallel to the XY plane.
5. The laser optical path system as described in claim 4, characterized in that, Each of the second planar reflectors is configured as a cylindrical reflector.
6. The laser optical path system as described in claim 1, characterized in that, The laser optical path system also includes: a third plane mirror; The third planar reflector is located in the XY plane; The third planar reflector is used to reflect the laser emitted from the laser back to the first S-polarization beam splitter.
7. The laser optical path system as described in claim 6, characterized in that, The laser optical path system also includes: a fourth plane mirror and a fifth plane mirror; Both the fourth and fifth plane mirrors are located in the XY plane; The fourth plane mirror is used to reflect the first laser beam transmitted through the first S-polarization beam splitter back to the second S-polarization beam splitter. The fifth planar reflector is also used to reflect the second laser beam reflected by the first S-polarization beam splitter to the third S-polarization beam splitter.
8. The laser optical path system as described in claim 7, characterized in that, Both the fourth and fifth plane mirrors are configured as cylindrical mirrors.
9. The laser optical path system as described in claim 8, characterized in that, The laser emitted by the laser travels the same distance to the fusion center through the first to fourth optical paths.
10. A laser welding machine, characterized in that, The laser fusion welding machine includes the laser optical path system as described in any one of claims 1 to 9.