A laser assembly, pumping source, fiber laser and laser processing device

Abstract

The utility model discloses a kind of laser assembly, pump source, fiber laser and laser processing device, laser assembly includes: first laser chip, first coating mirror, slow axis collimating lens, second coating mirror and second laser chip of common optical axis arrangement;First laser chip output first laser is transmitted through first coating mirror, again collimates through slow axis collimating lens, incident to second coating mirror and be reflected by second coating mirror;Second laser chip output second laser is transmitted through second coating mirror, again collimates through slow axis collimating lens, incident to first coating mirror and be reflected by first coating mirror.The scheme of the utility model embodiment can improve the space utilization of fiber laser, save cost.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor laser technology, and in particular to a laser component, a pump source, a fiber laser, and a laser processing device. Background Technology

[0002] Semiconductor fiber lasers have become one of the most widely used lasers due to their compact structure, high conversion efficiency and good beam quality. They have been widely used in fields such as medicine, communications, radar, sensing, industrial processing and scientific research.

[0003] The optical path structure of currently used semiconductor lasers mainly includes chips, fast-axis collimating mirrors, slow-axis collimating mirrors, mirrors, and coupling lenses. However, each component in existing semiconductor lasers serves only one chip. The advantage is that the energy of each chip can be used most effectively, but the disadvantage is that the space utilization rate is not high and the component cost is high. Utility Model Content

[0004] This invention provides a laser component, a pump source, a fiber laser, and a laser processing device, which can improve the space utilization of fiber lasers and save costs.

[0005] In a first aspect, this utility model provides a laser component, including: a first laser chip arranged coaxially, a first coated mirror, a slow-axis collimating mirror, and a second coated mirror;

[0006] The first laser chip is used to output a first laser. The output first laser is transmitted through the first coated reflector, then collimated by the slow-axis collimating lens, and then incident on the second coated reflector and reflected by the second coated reflector.

[0007] The second laser chip is used to output a second laser. The output second laser is transmitted through the second coated mirror, collimated by the slow-axis collimating mirror, incident on the first coated mirror, and reflected by the first coated mirror.

[0008] Optionally, the center wavelengths of the first laser and the second laser are different; both the first coated mirror and the second coated mirror are dichroic mirrors. Optionally, the polarizations of the first laser and the second laser are orthogonal, and both the first coated mirror and the second coated mirror are polarizing beam splitters.

[0009] Optionally, the laser assembly further includes a first fast-axis collimating lens and a second fast-axis collimating lens;

[0010] The first laser output from the first laser chip is transmitted through the first fast-axis collimating lens and then incident on the first coated mirror; the second laser output from the second laser chip is transmitted through the second fast-axis collimating lens and then incident on the second coated mirror.

[0011] Secondly, this utility model embodiment also provides a pump source, including the laser component described in the first aspect, and further including a focusing component, wherein the focusing component includes a collimating focusing lens group and a first optical fiber arranged coaxially in sequence.

[0012] Optional components include a first light-emitting module, a second light-emitting module, and optical components;

[0013] The first light-emitting module includes a preset number of first laser components, and the second light-emitting module includes the same number of second laser components as the first laser components; the first light-emitting module and the second light-emitting module are alternately arranged along a third direction; each of the first laser components and the second laser components are alternately arranged along a first direction; the height of each of the first laser components decreases sequentially in a second direction, forming a stepped arrangement; the height of each of the second laser components decreases sequentially in a second direction, forming a stepped arrangement; wherein, the second direction is perpendicular to the first direction;

[0014] The first laser emitted by each of the first laser components, the second laser emitted by each of the first laser components, the first laser emitted by each of the second laser components, and the second laser emitted by each of the second laser components are all parallel to the first direction and do not overlap with each other.

[0015] The first laser emitted by each of the first laser components, the second laser emitted by each of the first laser components, the first laser emitted by each of the second laser components, and the second laser emitted by each of the second laser components are combined by the optical components.

[0016] Optionally, the optical components include a first half-wave plate, a first polarization combiner, a third coated mirror, a second half-wave plate, a second polarization combiner, and a fourth coated mirror.

[0017] The first laser emitted from each of the first laser components or the first laser emitted from each of the second laser components has its polarization direction changed by the first half-wave plate; the first laser emitted from each of the first laser components or the first laser emitted from each of the second laser components is reflected by the third coated reflector to the first polarization beam combiner; the first laser with its polarization direction changed and the first laser with its polarization direction unchanged are combined by the first polarization beam combiner.

[0018] The second laser emitted from each of the first laser components or the second laser emitted from each of the second laser components has its polarization direction changed by the second half-wave plate; the second laser emitted from each of the first laser components or the second laser emitted from each of the second laser components is reflected by the fourth coated reflector to the second polarization beam combiner; the second laser with its polarization direction changed and the second laser with its polarization direction unchanged are combined by the second polarization beam combiner.

[0019] The optical components also include a fifth coated mirror and a sixth coated mirror;

[0020] Alternatively, the second laser beam combined by the second polarization beam combiner is reflected by the fifth coated mirror and then combined with the first laser beam combined by the first polarization beam combiner through the sixth coated mirror;

[0021] The first laser beam, after being combined by the first polarization beam combiner, is reflected by the fifth coated mirror and then combined with the second laser beam, after being combined by the second polarization beam combiner, through the sixth coated mirror.

[0022] Optionally, the semiconductor laser further includes a focusing component;

[0023] The first laser emitted by each of the first laser components, the second laser emitted by each of the first laser components, the first laser emitted by each of the second laser components, and the second laser emitted by each of the second laser components are combined by the optical components and output along the same optical axis in a third direction after being focused by the focusing components; wherein, the first direction intersects with the third direction, and the second direction is perpendicular to the third direction.

[0024] The focusing assembly includes a collimating and focusing lens group and a first optical fiber arranged sequentially and coaxially.

[0025] The first laser emitted by each of the first laser components, the second laser emitted by each of the first laser components, the first laser emitted by each of the second laser components, and the second laser emitted by each of the second laser components are reflected by the optical components, transmitted through the collimating and focusing lens group, and then output through the first optical fiber.

[0026] Thirdly, this utility model embodiment also provides a fiber laser, including the pump source described in the second aspect.

[0027] Fourthly, this utility model embodiment also provides a laser processing apparatus, including the fiber laser described in the third aspect.

[0028] This invention provides a laser component, a pump source, a fiber laser, and a laser processing apparatus. By placing a first coated mirror capable of transmitting the first laser and reflecting the second laser, and a second coated mirror capable of transmitting the second laser and reflecting the first laser, and sharing a slow-axis collimating lens, when multiple first and second laser chips exist in the pump source, the first and second laser chips can be alternately arranged, reducing the spacing required for the layout of multiple laser chips and decreasing the overall size of the laser. This invention improves the space utilization of the pump source, saves costs, and yields a very small pump source.

[0029] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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 these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the optical path of a laser component in the prior art;

[0032] Figure 2 This is a schematic diagram of the optical path of a semiconductor laser in the prior art.

[0033] Figure 3 A schematic diagram of the optical path of a laser component provided in an embodiment of this utility model;

[0034] Figure 4 This is a schematic diagram of the optical path of a pump source provided for an embodiment of the present invention.

[0035] The reference numerals in each of the attached figures are as follows:

[0036] 11. Chip; 12. Fast-axis collimating lens; 13. Slow-axis collimating lens; 14. Mirror; 15. Coupler lens; 16. Optical fiber; 31. First laser chip; 32. First coated mirror; 33. Slow-axis collimating lens; 34. Second coated mirror; 35. Second laser chip; A. First laser; B. Second laser; 36. First fast-axis collimating lens; 37. Second fast-axis collimating lens; 100. First light-emitting module; 200. Second light-emitting module; 300. Optical components; 110, First laser assembly; 210, Second laser assembly; X, First direction; Y, Third direction; Z, Second direction; 310, First half-wave plate; 320, First polarization combiner; 330, Third coated mirror; 340, Second half-wave plate; 350, Second polarization combiner; 360, Fourth coated mirror; 370, Fifth coated mirror; 380, Sixth coated mirror; 400, Focusing assembly; 410, Collimating focusing lens group; 420, First optical fiber. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] Figure 1 This is a schematic diagram of the optical path of a laser component in the prior art. Figure 2 This is a schematic diagram of the optical path of a semiconductor laser in the prior art, for reference. Figure 1 and Figure 2The optical path structure of currently used semiconductor lasers mainly includes a chip 11, a fast-axis collimating mirror 12, a slow-axis collimating mirror 13, a reflector 14, a coupling lens 15, and an optical fiber 16. In existing technologies, each device serves only one chip. However, semiconductor lasers designed using this structure require a large volume and many components, and the long optical path also increases the difficulty of coupling.

[0040] In view of the shortcomings of low space utilization and high device cost of existing semiconductor lasers, this invention provides a laser component and semiconductor laser by utilizing the objective conditions of commonly used wavelengths and polarization characteristics of semiconductor lasers, which can improve space utilization and save device costs. Figure 3 This is a schematic diagram of the optical path of a laser component provided in an embodiment of the present invention, with reference to... Figure 3 The laser assembly includes: a first laser chip 31 arranged coaxially, a first coated mirror 32, a slow-axis collimating mirror 33, a second coated mirror 34, and a second laser chip 35. The first laser chip 31 outputs a first laser A. The output first laser A is transmitted through the first coated mirror 32, then collimated by the slow-axis collimating mirror 33, and incident on the second coated mirror 34, where it is reflected. The second laser chip 35 outputs a second laser B. The output second laser B is transmitted through the second coated mirror 34, then collimated by the slow-axis collimating mirror 33, and incident on the first coated mirror 33, where it is reflected.

[0041] When there are multiple first laser chips 31 and second laser chips 35 in the pump source, a first coated reflector 32 that can transmit the first laser A and reflect the second laser B, and a second coated reflector 34 that can transmit the second laser B and reflect the first laser A are set between the first laser chip 31 and the second laser chip 35, and they share a slow-axis collimating lens 33; the first laser chip 31 and the second laser chip 35 can be arranged alternately and sequentially, reducing the spacing required for the layout of multiple laser chips and reducing the overall size of the laser.

[0042] In this embodiment of the invention, the slow-axis collimating lens 33 can be a biconvex slow-axis collimating lens. The package size of the first laser chip 31 and the second laser chip 35 can be 5×5mm, and the interval between the first laser chip 31 and the second laser chip 35 in the same laser assembly is not less than 10mm.

[0043] It should be noted that in this embodiment of the invention, the wavelengths of the first laser A output by the first laser chip 31 and the second laser B output by the second laser chip 35 are close, and for the same glass material, the difference in refractive index is very small, so some components can be shared. The first coated reflector 32 and the second coated reflector 34 are made of reflectors with different coatings, thereby achieving the purpose that the first coated reflector 32 transmits the first laser A and reflects the second laser B, and the second coated reflector 34 transmits the second laser B and reflects the first laser A. It can also achieve the purpose of transmitting S-polarized light and reflecting P-polarized light or transmitting P-polarized light and reflecting S-polarized light.

[0044] This embodiment of the invention, by placing a first coated reflector 32 capable of transmitting the first laser A and reflecting the second laser B, and a second coated reflector 34 capable of transmitting the second laser B and reflecting the first laser A, between the first laser chip 31 and the second laser chip 35, and sharing a slow-axis collimating lens 33, allows the pump source to have multiple first laser chips 31 and second laser chips 35 arranged alternately and sequentially, reducing the spacing required for the layout of multiple laser chips and decreasing the overall size of the laser. This embodiment of the invention improves the space utilization of the pump source, saves costs, and yields a very small pump source.

[0045] Optionally, the center wavelengths of the first laser A and the second laser B are different; both the first coated mirror 32 and the second coated mirror 34 are dichroic mirrors.

[0046] For example, in one embodiment, the wavelength range of the first laser A is 905nm to 925nm, with a center wavelength of 915nm and a peak wavelength of 915nm; the wavelength range of the second laser B is 972nm to 980nm, with a center wavelength of 976nm and a peak wavelength of 976nm. Optionally, based on the above embodiment, the first coated reflector 32 transmits light with a wavelength of 915nm and reflects light with a wavelength of 976nm; the second coated reflector 34 transmits light with a wavelength of 976nm and reflects light with a wavelength of 915nm.

[0047] It is understandable that 915nm and 976nm wavelengths are quite close, and for the same glass material, the difference in refractive index is very small, so some components can be shared. In this embodiment of the invention, the first coated reflector 32 and the second coated reflector 34 are made of reflectors with different coatings, thereby achieving the purpose that the first coated reflector 32 transmits light with a wavelength of 915nm and reflects light with a wavelength of 976nm, and the second coated reflector 34 transmits light with a wavelength of 976nm and reflects light with a wavelength of 915nm, thereby improving space utilization and saving costs.

[0048] Optionally, based on the above embodiments, the first laser A and the second laser B are orthogonally polarized, and the first coated reflector 32 and the second coated reflector 34 are both polarizing beam splitters.

[0049] For example, in one embodiment, the first laser A includes P-polarized light and the second laser B includes S-polarized light; or the first laser A includes S-polarized light and the second laser B includes P-polarized light.

[0050] Optionally, based on the above embodiments, when the first laser A includes P-polarized light and the second laser B includes S-polarized light, the first coated reflector 32 transmits P-polarized light and reflects S-polarized light; the second coated reflector 34 transmits S-polarized light and reflects P-polarized light; when the first laser A includes S-polarized light and the second laser B includes P-polarized light, the first coated reflector 32 transmits S-polarized light and reflects P-polarized light; the second coated reflector 34 transmits P-polarized light and reflects S-polarized light.

[0051] The first coated reflector 32 and the second coated reflector 34 of this utility model embodiment are made of reflectors with different coatings, thereby achieving the purpose that the first coated reflector 32 transmits P-polarized light and reflects S-polarized light; and the second coated reflector 34 transmits S-polarized light and reflects P-polarized light, or the first coated reflector 32 transmits S-polarized light and reflects P-polarized light; and the second coated reflector 34 transmits P-polarized light and reflects S-polarized light, thereby improving space utilization and saving costs.

[0052] Optionally, based on the above embodiments, continue to refer to... Figure 3 The laser assembly also includes a first fast-axis collimating lens 36 and a second fast-axis collimating lens 37; the first laser A output by the first laser chip 31 is transmitted through the first fast-axis collimating lens 36 and then incident on the first coated reflector 32; the second laser B output by the second laser chip 35 is transmitted through the second fast-axis collimating lens 37 and then incident on the second coated reflector 34.

[0053] Figure 4 This utility model provides an optical path diagram of a pump source according to an embodiment of the present invention. The present utility model also provides a pump source, including the laser component provided in the above embodiment. Figure 4 The first laser component 110 and the second laser component 210 are both laser components provided in the above embodiments. The laser component 400 is also included. The laser component 400 includes a first fast-axis collimating lens 410, a first slow-axis collimating lens 420 and a first optical fiber 430 arranged in sequence along the optical axis.

[0054] refer to Figure 4The pump source includes a first light-emitting module 100, a second light-emitting module 200, and an optical component 300. The first light-emitting module 100 includes a preset number of first laser components 110, and the second light-emitting module 200 includes the same number of second laser components 210 as the first laser components 110. The first light-emitting module 100 and the second light-emitting module 200 are alternately arranged along a third direction Y. Each first laser component 110 and each second laser component 210 are alternately arranged along a first direction X. Each first laser component 110 decreases sequentially in the second direction Z, arranged in a stepped manner. Each second laser component 210 decreases sequentially in the second direction Z. The laser beams are arranged in a stepped manner, decreasing in size; the second direction Z is perpendicular to the first direction X; the first laser A emitted by each first laser component 110, the second laser B emitted by each first laser component 110, the first laser A emitted by each second laser component 210, and the second laser B emitted by each second laser component 210 are all parallel to the first direction X and do not overlap with each other; the first laser A emitted by each first laser component 110, the second laser B emitted by each first laser component 110, the first laser A emitted by each second laser component 210, and the second laser B emitted by each second laser component 210 are combined by the optical component 300.

[0055] It is understandable that, in the second direction Z, two types of laser components can be set on the same horizontal plane, that is, the first laser component 110 and the second laser component 210 are set on the same horizontal plane in a one-to-one correspondence; or only one set of laser components can be set on the same horizontal plane, that is, the first laser component 110 and the second laser component 210 are alternately set on different horizontal planes, and the height decreases sequentially.

[0056] In this embodiment of the present invention, the first laser component 110 and the second laser component 210 are alternately arranged along the first direction X, and the height of each first laser component 110 decreases sequentially in the second direction Z, forming a stepped arrangement; the height of each second laser component 210 decreases sequentially in the second direction Z, forming a stepped arrangement; the first laser A emitted by each first laser component 110, the second laser B emitted by each first laser component 110, the first laser A emitted by each second laser component 210, and the second laser B emitted by each second laser component 210 are all parallel to the first direction X and do not overlap with each other, which can save space. The two first lasers A and the two second lasers B can form four light spots, and the optical component 300 can combine the four lasers to finally form one light spot.

[0057] The solution of this utility model embodiment can shorten the optical path, increase space utilization, reduce device cost, and make the housing smaller and lower in cost.

[0058] Optionally, based on the above embodiments, continue to refer to... Figure 4The optical assembly 300 includes a first half-wave plate 310, a first polarization combiner 320, a third coated mirror 330, a second half-wave plate 340, a second polarization combiner 350, and a fourth coated mirror 360. The polarization direction of the first laser A emitted from each of the first laser assemblies 110 or each of the second laser assemblies 210 is changed by the first half-wave plate 310. Figure 4 Only the case where the polarization direction of the first laser A emitted from each of the first laser components 110 is changed by the first half-wave plate 310 is shown; the first laser A emitted from each of the first laser components 110 or the first laser A emitted from each of the second laser components 210 is reflected by the third coated reflector 330 to the first polarization combiner 320. Figure 4 The diagram only shows the case where the first laser A emitted from each of the first laser components 110 is reflected by the third coated mirror 330 to the first polarization combiner 320; the first laser A with its polarization direction changed is combined with the first laser A with its polarization direction unchanged by the first polarization combiner 320; the second laser B emitted from each of the first laser components 110 or the second laser B emitted from each of the second laser components 210 has its polarization direction changed by the second half-wave plate 340 ( Figure 4 The image only shows the case where the polarization direction of the second laser B emitted from each of the first laser components 110 is changed by the second half-wave plate 340; the second laser B emitted from each of the first laser components 110 or the second laser B emitted from each of the second laser components 210 is reflected by the fourth coated reflector 360 to the second polarization beam combiner 350. Figure 4 The diagram only shows the case where the second laser B emitted from each of the first laser components 110 is reflected by the fourth coated mirror 360 to the second polarization combiner 350; the second laser B with its polarization direction changed is combined with the second laser B with its polarization direction unchanged by the second polarization combiner 350. The optical component 300 also includes a fifth coated mirror 370 and a sixth coated mirror 380. Specifically, the second laser B, after being combined by the second polarization combiner 350, is reflected by the fifth coated mirror 370 and then combined with the first laser A, which has been combined by the first polarization combiner, by the sixth coated mirror 380; or, the first laser A, after being combined by the first polarization combiner 320, is reflected by the fifth coated mirror 370 and then combined with the second laser B, which has been combined by the second polarization combiner 350, by the sixth coated mirror 380. Figure 4 The image only shows the case where the second laser B, after being combined by the second polarization beam combiner 350, is reflected by the fifth coated mirror 370 and then combined with the first laser A, after being combined by the first polarization beam combiner, through the sixth coated mirror 380.

[0059] It is understandable that a half-wave plate can be used to change the polarization direction of one beam each from the first laser A and the second laser B. A polarization combiner can be used to combine the S-polarized light (915nm) and P-polarized light (976nm), obtaining one beam spot each from the first laser A and the second laser B. Finally, a coated mirror (transmitting light with a wavelength of 976nm and reflecting light with a wavelength of 915nm, or transmitting light with a wavelength of 915nm and reflecting light with a wavelength of 976nm) is used for spectral combining, ultimately obtaining a single beam spot. It should be noted that this embodiment of the invention... Figure 4 The reflective component 300 provided in this embodiment is only an example. In other embodiments, the second laser B can be reflected by the reflector and then combined with the first laser A by a coated reflector that can transmit the first laser A and reflect the second laser B. Alternatively, the first laser A can be reflected by the reflector and then combined with the second laser B by a coated reflector that can transmit the second laser B and reflect the first laser A.

[0060] Optionally, based on the above embodiments, continue to refer to... Figure 4 The pump source also includes a focusing component 400; the first laser A emitted from each of the first laser components 110, the second laser B emitted from each of the first laser components 110, the first laser A emitted from each of the second laser components 210, and the second laser B emitted from each of the second laser components 210 are combined by the optical component 300 and output along the same optical axis in the third direction Y; wherein, the first direction X intersects the third direction Y, and the second direction Z is perpendicular to the third direction Y.

[0061] In some preferred embodiments of this application, such as Figure 4 As indicated, the first direction X, the third direction Y, and the second direction Z can be perpendicular to each other. It is understood that in some embodiments, the three directions X, Y, and Z can refer generally to three spatial directions that do not overlap with each other. The accompanying drawings only show the arrangement where the first direction X, the second direction Y, and the third direction Z are perpendicular; other arrangements where the first direction X, the third direction Y, and the second direction Z do not overlap with each other are still included within the scope of this application.

[0062] Continue to refer to Figure 4 The focusing assembly 400 includes a collimating focusing lens group 410 and a first optical fiber 420 arranged coaxially in sequence. The first laser A emitted from each first laser assembly 110, the second laser B emitted from each first laser assembly 110, the first laser A emitted from each second laser assembly 210, and the second laser B emitted from each second laser assembly 210 are reflected by the optical assembly 300, transmitted through the collimating focusing lens group 410, and output through the first optical fiber 420.

[0063] It should be noted that the light-concentrating component 400 provided in this embodiment of the present invention is only an example. The light-concentrating component 400 can output the light after it has been combined by the optical component 300 to the coupling optical fiber after collimation and focusing.

[0064] The solution of this utility model embodiment can improve the space utilization of the pump source, save costs, and obtain a pump source with extremely small size.

[0065] This utility model embodiment also provides a fiber laser, including the pump source provided in any of the above embodiments.

[0066] This utility model embodiment also provides a laser processing apparatus, including the fiber laser provided in the above embodiment.

[0067] In summary, this invention utilizes the wavelength differences and polarization characteristics of commonly used laser chips to share a slow-axis collimating lens for lasers of different wavelengths, and arranges the laser components in an alternating manner to save space and components. The solution of this invention shortens the optical path, achieves higher space utilization, reduces component costs, and results in a smaller housing size and lower overall cost.

[0068] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A laser assembly, characterized in that, include: A first laser chip, a first coated mirror, a slow-axis collimating mirror, a second coated mirror, and a second laser chip are arranged coaxially; The first laser chip is used to output a first laser. The first laser is transmitted through the first coated mirror, then collimated by the slow-axis collimating mirror, and then incident on the second coated mirror and reflected by the second coated mirror. The second laser chip is used to output a second laser. The second laser is transmitted through the second coated mirror, collimated by the slow-axis collimating mirror, incident on the first coated mirror, and reflected by the first coated mirror.

2. The laser assembly according to claim 1, characterized in that, The first laser and the second laser have different center wavelengths; both the first coated mirror and the second coated mirror are dichroic mirrors.

3. The laser assembly according to claim 1, characterized in that, The first laser and the second laser are orthogonally polarized, and both the first coated mirror and the second coated mirror are polarizing beam splitters.

4. The laser assembly according to claim 1, characterized in that, The laser assembly also includes a first fast-axis collimating lens and a second fast-axis collimating lens; The first laser output from the first laser chip is transmitted through the first fast-axis collimating lens and then incident on the first coated reflector. The second laser output from the second laser chip is transmitted through the second fast-axis collimating lens and then incident on the second coated reflector.

5. A pump source, characterized in that, The laser assembly includes the laser component as described in any one of claims 1-4, and further includes a focusing component, the focusing component including a collimating focusing lens group and a first optical fiber arranged coaxially in sequence.

6. The pump source according to claim 5, characterized in that, It includes a first light-emitting module, a second light-emitting module, and optical components; The first light-emitting module includes a preset number of first laser components, and the second light-emitting module includes the same number of second laser components as the first laser components; The first light-emitting module and the second light-emitting module are alternately arranged along a third direction; each of the first laser components and the second laser components are alternately arranged along a first direction; the height of each of the first laser components decreases sequentially in a second direction, and they are arranged in a stepped manner; the height of each of the second laser components decreases sequentially in a second direction, and they are arranged in a stepped manner. The first laser emitted by each of the first laser components, the second laser emitted by each of the first laser components, the first laser emitted by each of the second laser components, and the second laser emitted by each of the second laser components are all parallel to the first direction and do not overlap with each other. The first laser emitted by each of the first laser components, the second laser emitted by each of the first laser components, the first laser emitted by each of the second laser components, and the second laser emitted by each of the second laser components are combined by the optical components.

7. The pump source according to claim 6, characterized in that, The optical components include a first half-wave plate, a first polarization combiner, a third coated mirror, a second half-wave plate, a second polarization combiner, and a fourth coated mirror. The first laser emitted from each of the first laser components or the first laser emitted from each of the second laser components has its polarization direction changed by the first half-wave plate; the first laser emitted from each of the first laser components or the first laser emitted from each of the second laser components is reflected by the third coated reflector to the first polarization beam combiner; the first laser with its polarization direction changed and the first laser with its polarization direction unchanged are combined by the first polarization beam combiner. The second laser emitted from each of the first laser components or the second laser emitted from each of the second laser components has its polarization direction changed by the second half-wave plate; the second laser emitted from each of the first laser components or the second laser emitted from each of the second laser components is reflected by the fourth coated mirror to the second polarization beam combiner; the second laser with its polarization direction changed and the second laser with its polarization direction unchanged are combined by the second polarization beam combiner; the optical component also includes a fifth coated mirror and a sixth coated mirror; The second laser beam, after being combined by the second polarization beam combiner, is reflected by the fifth coated mirror and then combined with the first laser beam, after being combined by the first polarization beam combiner, through the sixth coated mirror. Alternatively, the first laser beam combined by the first polarization beam combiner is reflected by the fifth coated mirror and then combined with the second laser beam combined by the second polarization beam combiner by the sixth coated mirror.

8. The pump source according to claim 6, characterized in that, The pump source also includes a focusing component; the first laser emitted by each of the first laser components, the second laser emitted by each of the first laser components, the first laser emitted by each of the second laser components, and the second laser emitted by each of the second laser components are combined by the optical component and output to the focusing component; The focusing component includes a collimating focusing lens group and a first optical fiber arranged sequentially along the optical axis; the first laser emitted by each of the first laser components, the second laser emitted by each of the first laser components, the first laser emitted by each of the second laser components, and the second laser emitted by each of the second laser components are reflected by the optical component, transmitted through the collimating focusing lens group, and output through the first optical fiber.

9. A fiber laser, characterized in that, Includes the pump source as described in any one of claims 5-8.

10. A laser processing apparatus, characterized in that, Includes the fiber laser as described in claim 9.

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