Space laser beam combiner and laser

Abstract

The invention relates to the technical field of laser beam combination, and discloses a space laser beam combiner and a laser, the space laser beam combiner comprises a first laser light source, a second laser light source and a beam combining lens, the beam combining lens comprises a first surface, a second surface and a third surface, and the refractive index of the beam combining lens is larger than that of air. After the first laser beam enters the beam combining lens from the first surface, the incident angle of the first laser beam on the second surface is larger than a total reflection critical angle so that the first laser beam can be totally reflected to the third surface, and a deflection angle exists between the third surface and the second surface so that the incident angle of the first laser beam on the third surface is smaller than the total reflection critical angle. The first laser beam is refracted to the outside of the beam combining lens from the third surface, and the second laser beam is refracted to the outside of the beam combining lens from the third surface after entering the beam combining lens from the second surface and coincides with the first laser beam. According to the beam combining lens, laser beam combining can be achieved without plating a reflecting film, and the manufacturing cost of the space laser beam combiner is reduced.

Description

Technical Field

[0001] The present invention relates to the field of laser beam combining technology, and in particular to a space laser beam combiner and a laser. Background Art

[0002] Laser beam combination is a technology that combines the output beams of multiple laser sources into a single beam to achieve high power and high brightness output. This technology has broad application prospects in many fields, including scientific research, industrial processing, medical surgery, etc.

[0003] Beam combining technology can be divided into two types: spectral beam combining and spatial beam combining. Current spatial beam combining methods include Figure 1 As shown, it generally includes a first laser module 101, a second laser module 102 and a beam combiner 103. The first laser module 101 and the second laser module 102 are respectively used to generate a first laser 11 and a second laser 12, and then the first laser 11 and the second laser 12 are combined into a new mixed laser 1 by the beam combiner 103 to increase the laser power.

[0004] In the above-mentioned spatial beam combining method, a reflective film must be coated on the beam combining lens when combining lasers of light sources with different wavelengths. When the first laser module 101 and the second laser module 102 generate lasers of different wavelengths, such as the first laser module 101 and the second laser module 102 generate a first laser l1 of 1064nm and a second laser l2 of 532nm, respectively, beam combining can be achieved by coating a reflective film of 1064nm and a transmissive film of 532nm on the beam combining mirror 103. The need to coat the reflective film on the beam combining mirror 103 increases the cost of the spatial laser beam combiner. Summary of the invention

[0005] In view of this, the present invention provides a space laser beam combiner and a laser to solve or partially solve the technical problem that the existing space laser beam combiner needs to be coated with a reflective film, resulting in an increase in cost.

[0006] The technical solution proposed by the present invention is as follows:

[0007] In a first aspect, the present invention provides a spatial laser beam combiner, comprising: a first laser light source for outputting a first laser beam; a second laser light source for outputting a second laser beam; a beam combining lens, comprising a first surface, a second surface and a third surface; wherein the refractive index of the beam combining lens is greater than the refractive index of air; after the first laser beam is incident on the beam combining lens from the first surface, the incident angle on the second surface is greater than the critical angle of total reflection so as to be totally reflected to the third surface, and there is a deflection angle between the third surface and the second surface so that the incident angle of the first laser beam on the third surface is less than the critical angle of total reflection, and the first laser beam is refracted from the third surface to the outside of the beam combining lens; after the second laser beam is incident on the beam combining lens from the second surface, it is refracted from the third surface to the outside of the beam combining lens and overlaps with the first laser beam.

[0008] The spatial laser beam combiner of the present invention utilizes the principle of total reflection when a light beam is transmitted from a light-dense medium to a light-sparse medium. By adopting a beam combining lens having a refractive index greater than that of air, and setting angles of the first surface, the second surface, and the third surface of the beam combining lens, wherein a deflection angle exists between the third surface and the second surface so that the incident angle of the first laser beam on the third surface is less than the critical angle of total reflection, so that after the first laser beam is incident on the beam combining lens from the first surface, the first laser beam can be refracted from the third surface to the outside of the beam combining lens. At the same time, by adjusting the emission angles of the first laser light source and the second laser light source, after the second laser beam is incident on the beam combining lens from the second surface, it is also refracted from the same position of the third surface to the outside of the beam combining lens and overlaps with the first laser beam, thereby combining the first laser beam and the second laser beam and realizing composite laser output. The beam combining lens does not need to be coated with a reflective film to realize laser beam combining, thereby reducing the manufacturing cost of the spatial laser beam combiner.

[0009] Optionally, a wavelength of the first laser beam is smaller than a wavelength of the second laser beam.

[0010] In this manner, composite output of lasers of different wavelengths can be achieved, and since the wavelength of the first laser beam is relatively small, total reflection is more likely to occur.

[0011] Optionally, the wavelength of the first laser beam is 500nm to 600nm, and the wavelength of the second laser beam is 1000nm to 1100nm.

[0012] In this way, a composite laser of green light and infrared light can be output, which can meet more application scenarios in current industrial processing.

[0013] Optionally, the refractive index of the beam combining lens is 1.5 to 2.0.

[0014] In this manner, by selecting a high refractive index material with a refractive index of 1.5 to 2.0 as the manufacturing material of the beam combining lens, it is possible to make it easier for the second surface to undergo total reflection.

[0015] Optionally, the deflection angle between the third surface and the second surface is 15° to 45°.

[0016] In this manner, when the deflection angle is between 15° and 45°, the first laser beam can be refracted to the outside in a larger proportion on the third surface when the first laser beam is totally reflected on the second surface.

[0017] Optionally, the spatial laser beam combiner further includes a first collimator mirror, which is disposed between the first laser light source and the first surface and is used for collimating the first laser light beam emitted by the first laser light source and outputting the collimated first laser light beam to the first surface.

[0018] In this manner, the collimation of the first laser beam is improved, and the divergence of the first laser beam during propagation is reduced, thereby improving the quality of the beam after beam combination.

[0019] Optionally, the spatial laser beam combiner further includes a second collimator, which is disposed between the second laser light source and the second surface and is used for collimating the second laser light beam emitted by the second laser light source and outputting the collimated second laser light beam to the second surface.

[0020] In this manner, the collimation of the second laser beam is improved, and the divergence of the second laser beam during propagation is reduced, thereby improving the quality of the combined beam.

[0021] Optionally, the spatial laser beam combiner also includes a focusing lens, which is arranged on the combined beam path of the first laser beam and the second laser beam after being refracted by the third surface, and is used to focus the first laser beam and the second laser beam after being refracted by the third surface.

[0022] In this method, the focusing characteristics of the combined light beam are adjusted by a focusing lens to meet different laser processing application requirements, such as achieving more precise operations in laser processing.

[0023] In a second aspect, the present invention provides a laser, comprising the spatial laser beam combiner as described in the first aspect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly express the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the structure of a space laser beam combiner in the prior art;

[0026] Figure 2 It is a schematic diagram of the structure of a spatial laser beam combiner in an embodiment of the present invention;

[0027] Figure 3 It is a schematic structural diagram of another spatial laser beam combiner in an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of another spatial laser beam combiner in an embodiment of the present invention.

[0029] Reference numerals:

[0030] 101-first laser module; 102-second laser module; 103-beam combining mirror; l1-first laser; l2-second laser; l-mixed laser; 21-first laser light source; 22-second laser light source; 23-beam combining mirror; 231-first surface; 232-second surface; 233-third surface; L-beam combining laser; L1-first laser beam; L2-second laser beam; 24-first collimating mirror; 25-second collimating mirror; 26-focusing lens. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] In the context of the rapid development of science and technology today, laser technology has become an indispensable tool in the fields of industrial manufacturing, medical surgery, scientific research and exploration. The high energy, high collimation and high focusing of lasers give them unique advantages in many applications. However, a single laser source is often difficult to meet the needs of complex application scenarios. Therefore, spatial laser beam combiners have emerged. They can combine laser beams of different wavelengths and different characteristics into one to achieve composite laser output to meet a wider range of application needs.

[0036] In order to solve the problem that the existing spatial laser beam combiner needs to coat the lens with a reflective film according to the wavelength of the combined light beam, an embodiment of the present invention provides a spatial laser beam combiner that does not require coating with a reflective film, thereby reducing the cost of the beam combiner.

[0037] like Figure 2 As shown, the spatial laser beam combiner of the embodiment of the present invention includes: a first laser light source 21, used to output a first laser beam L1; a second laser light source 22, used to output a second laser beam L2; a beam combining lens 23, including a first surface 231, a second surface 232 and a third surface 233; wherein the refractive index of the beam combining lens 23 is greater than the refractive index of air; after the first laser beam L1 is incident on the beam combining lens 23 from the first surface 231, the incident angle on the second surface 232 is greater than the critical angle of total reflection so as to be totally reflected to the third surface 233, and there is a deflection angle between the third surface 233 and the second surface 232 so that the incident angle of the first laser beam L1 on the third surface 233 is less than the critical angle of total reflection, and the first laser beam L1 is refracted from the third surface 233 to the outside of the beam combining lens 23; after the second laser beam L2 is incident on the beam combining lens 23 from the second surface 232, it is refracted from the third surface 233 to the outside of the beam combining lens 23 and overlaps with the first laser beam L1.

[0038] Specifically, the first laser light source 21 and the second laser light source 22 may be laser light sources such as a solid laser source, a gas laser source, a fiber laser source, and a semiconductor laser source.

[0039] The first laser beam L1 and the second laser beam L2 generated by the first laser light source 21 and the second laser light source 22 are used as beams to be combined and are incident on the beam combining lens 23 from the first surface 231 and the second surface 232 of the beam combining lens 23 respectively.

[0040] It should be understood that the refractive index of air is 1, and total reflection is a special phenomenon of light waves at the interface between a denser medium and a less dense medium. When light is incident from a denser medium to a less dense medium, and the incident angle is greater than the critical angle of total reflection, the light will be completely reflected back into the denser medium and will not penetrate into the less dense medium. In order to enable total reflection to occur in the beam combining lens 23, the refractive index of the beam combining lens 23 should be greater than the refractive index of air, that is, the beam combining lens 23 needs to be made of a material with a refractive index greater than 1, such as DAP material (refractive index of 1.56), PC material (refractive index of 1.59), and acrylic material (refractive index of 1.60).

[0041] It should be understood that the number of surfaces of the beam combining lens 23 is not less than three, and the number of surfaces may be three, four or five, etc. The first surface 231, the second surface 232 and the third surface 233 of the beam combining lens 23 are in different directions.

[0042] The second surface 232 and the third surface 233 of the beam combining lens 23 are not parallel and there is a deflection angle between them, so as to avoid the first laser beam L1 from being totally reflected on the third surface 233 when being totally reflected on the second surface 232 .

[0043] The working principle of the spatial laser beam combiner of the embodiment of the present invention is as follows:

[0044] When the laser beam is being processed, the first laser beam L1 emitted by the first laser light source 21 enters the beam-combining lens 23 from the first surface 231 of the beam-combining lens 23, is refracted at the first surface 231 of the beam-combining lens 23, is totally reflected on the second surface 232 of the beam-combining lens 23, and then is emitted from the third surface 233 of the beam-combining lens 23.

[0045] In order to meet the total reflection condition, the incident angle of the first laser beam L1 on the second surface 232 should be greater than the total reflection critical angle C. The calculation formula of the total reflection critical angle C is: n=1 / sinC, where n is the refractive index of the beam combining lens 23.

[0046] At the same time, the first and second laser beams emitted by the second laser light source 22 enter the beam combining lens 23 from the second surface 232 of the beam combining lens 23 , are refracted at the second surface 232 of the beam combining lens 23 , and are also emitted from the third surface 233 of the beam combining lens 23 .

[0047] The first light beam and the second light beam emitted by the first laser light source 21 and the second laser light source 22 are combined at the same position on the third surface 233 of the beam combining lens 23 to generate a new combined laser beam L to increase the laser power.

[0048] The spatial laser beam combiner of the embodiment of the present invention utilizes the principle of total reflection when a light beam is transmitted from a light-dense medium to a light-sparse medium. By using a beam combiner lens 23 having a refractive index greater than that of air, and setting angles of a first surface 231, a second surface 232, and a third surface 233 of the beam combiner lens 23, wherein a deflection angle exists between the third surface 233 and the second surface 232 so that the incident angle of the first laser beam L1 on the third surface 233 is less than the critical angle of total reflection, so that after the first laser beam L1 is incident from the first surface 231 to the beam combiner lens 23, the first laser beam L1 can It can be refracted from the third surface 233 to the outside of the beam-combining lens 23. At the same time, by adjusting the emission angles of the first laser light source 21 and the second laser light source 22, after the second laser light beam L2 is incident on the beam-combining lens 23 from the second surface 232, it is also refracted from the same position of the third surface 233 to the outside of the beam-combining lens 23 and overlaps with the first laser beam L1, so that the first laser beam L1 and the second laser beam L2 are combined to obtain the combined laser L, and the composite laser output is realized. The beam-combining lens 23 does not need to be coated with a reflective film to realize laser beam combining, thereby reducing the manufacturing cost of the spatial laser beam combiner.

[0049] Furthermore, the first laser light source 21 and the second laser light source 22 are light sources of different wavelengths, that is, the wavelength of the first laser beam L1 is smaller than the wavelength of the second laser beam L2. Therefore, when the first laser beam L1 is totally reflected on the second surface 232 of the beam-combining lens 23, the second laser beam L2 enters the beam-combining lens 23 from the second surface 232 of the beam-combining lens 23, and finally the first laser beam L1 and the second laser beam L2 can be combined.

[0050] It should be understood that since the wavelength of the first laser beam L1 is relatively small, its degree of deflection after being refracted by the third surface 233 will be slightly larger than that of the second laser beam L2. The incident angle of the second laser beam L2 can be adjusted accordingly so that the second laser beam L2 emitted through the third surface 233 coincides with the first laser beam L1.

[0051] In this way, not only can the composite output of lasers of different wavelengths be achieved, but also because the shorter wavelength light beam is more likely to be totally reflected, the propagation path of the light beam can be more accurately controlled, thereby improving the beam combining efficiency.

[0052] In some embodiments, the wavelength of the first laser beam L1 is 500 nm to 600 nm, and the wavelength of the second laser beam L2 is 1000 nm to 1100 nm.

[0053] For example, the wavelength of the first laser beam L1 is 500 nm, and the wavelength of the second laser beam L2 is 1000 nm, or the wavelength of the first laser beam L1 is 600 nm, and the wavelength of the second laser beam L2 is 1100 nm.

[0054] In a preferred example, the wavelength of the first laser beam L1 is green light with a wavelength of 550 nm, and the wavelength of the second laser beam L2 is infrared light with a wavelength of 1064 nm.

[0055] Composite lasers of green light and infrared light have many application scenarios in current industrial processing.

[0056] In some embodiments, the refractive index of the beam combining lens 23 is 1.5 to 2.0.

[0057] Specifically, high refractive index materials such as DAP material (refractive index of 1.56), PC material (refractive index of 1.59), and acrylic material (refractive index of 1.60) can be selected as the manufacturing material of the beam combining lens 23.

[0058] DAP material, namely diallyl diphenylamine, is a plastic material with a high refractive index. The refractive index of DAP material is 1.56, and the cost of use is low.

[0059] PC material, or polycarbonate, is a transparent material with high impact resistance and high strength. The refractive index of PC material is 1.59, which is higher than most plastics and glass, making it widely used in lenses, optical fibers and other fields.

[0060] Acrylic material, also known as PMMA (polymethyl methacrylate), is a polymer material with a refractive index between 1.49 and 1.51. Acrylic material has a relatively stable refractive index range due to its special chemical structure.

[0061] The use of these high refractive index materials makes it easier for the laser beam to be totally reflected on the second surface 232 of the beam combining lens 23, thereby improving the performance of the spatial laser beam combiner.

[0062] Furthermore, the deflection direction of the deflection angle between the third surface 233 and the second surface 232 makes the incident angle of the first laser beam L1 on the third surface 233 smaller than the incident angle of the first laser beam L1 on the second surface 232 , thereby avoiding total reflection of the first laser beam L1 on the third surface 233 .

[0063] Specifically, the deflection angle between the third surface 233 and the second surface 232 is in a range of 15° to 45°.

[0064] For example, the deflection angle between the third surface 233 and the second surface 232 is 15°, or the deflection angle between the third surface 233 and the second surface 232 is 45°, or the deflection angle between the third surface 233 and the second surface 232 is 30°.

[0065] By setting the deflection angle between the third surface 233 and the second surface 232 to be between 15° and 45°, it is ensured that the first laser beam L1 can be refracted to the outside at a greater proportion on the third surface 233 while satisfying the total reflection condition, thereby improving the beam combining efficiency.

[0066] In some embodiments, Figure 3 As shown, the spatial laser beam combiner further includes a first collimator 24 and a second collimator 25. The first collimator 24 is disposed between the first laser light source 21 and the first surface 231, and is used to collimate the first laser light beam L1 emitted by the first laser light source 21 and output it to the first surface 231. The second collimator 25 is disposed between the second laser light source 22 and the second surface 232, and is used to collimate the second laser light beam L2 emitted by the second laser light source 22 and output it to the second surface 232.

[0067] The first collimator 24 and the second collimator 25 are both optical lenses, which can be spherical lenses or aspherical lenses. Spherical lenses are widely used because of their simple manufacturing and low cost. However, spherical lenses have certain spherical aberrations, which may affect the collimation quality of the light beam. Aspherical lenses can compensate for spherical aberrations and provide higher quality collimated light beams through their unique curved surface design. When designing a spatial laser beam combiner, the most suitable type of collimator can be selected according to the characteristics of the light beam and the design requirements of the system.

[0068] In one example, both the first collimator 24 and the second collimator 25 are made of quartz glass lenses. Quartz glass is the preferred material in high-power laser systems due to its excellent optical properties and heat resistance. It can maintain high transmittance over a wide wavelength range, especially in the ultraviolet and infrared bands, which is particularly important for multi-wavelength laser combiners.

[0069] In this manner, by providing the first collimator 24 and the second collimator 25, the collimation of the first laser beam L1 and the second laser beam L2 is improved, and the divergence of the first laser beam L1 and the second laser beam L2 during propagation is reduced. The collimated laser will be more controllable so as to be refracted and reflected in a preset direction, thereby improving the quality of the combined beam.

[0070] In some embodiments, Figure 4As shown, the spatial laser beam combiner also includes a focusing lens 26, which is arranged on the combined beam path of the first laser beam L1 and the second laser beam L2 after being refracted by the third surface 233, and is used to focus the first laser beam L1 and the second laser beam L2 after being refracted by the third surface 233.

[0071] Specifically, the focusing lens 26 can be a combination of one or more convex lenses to achieve the best focusing effect on the light beam. These lenses can be spherical lenses or aspherical lenses. The latter can provide a higher quality focused light spot because it can reduce spherical aberration. In addition, the design of the focusing lens 26 also includes various types such as plano-convex, positive concave-convex, diffractive and reflective lenses to meet different application requirements.

[0072] The material selection of the focusing lens 26 also has a significant impact on its performance. The materials used for the focusing lens 26 of the embodiment of the present invention include K9 glass, quartz and ultraviolet fused quartz. K9 glass is widely used due to its good optical properties and low cost. Quartz material is favored due to its excellent transmittance in the ultraviolet and infrared light bands. Ultraviolet fused quartz is suitable for applications that require extremely high heat resistance and laser damage threshold resistance.

[0073] In this manner, the focusing characteristics of the combined light beam are adjusted by the focusing lens 26 to focus the first laser beam L1 and the second laser beam L2 to meet the subsequent laser processing application requirements, so that the laser processing can achieve higher accuracy and efficiency, such as achieving more sophisticated operations in laser processing.

[0074] The spatial laser beam combiner of the embodiment of the present invention provides new possibilities for the application of laser technology with its ingenious design concept. By controlling the angles of the first surface 231, the second surface 232 and the third surface 233 of the beam combining lens 23, efficient laser beam combining can be achieved without the need for reflective film coating, thereby reducing manufacturing costs and improving beam quality.

[0075] The spatial laser beam combiner of the embodiment of the present invention shows broad application prospects in the fields of industrial manufacturing, medical surgery, scientific research and exploration, and provides strong support for technological progress and innovative development in related fields.

[0076] An embodiment of the present invention further provides a laser, comprising the spatial laser beam combiner as in the above embodiment.

[0077] Although example embodiments and their advantages have been described in detail, those skilled in the art may make various changes, substitutions and modifications to these embodiments without departing from the spirit and defined scope of the present invention, and such modifications and variations are all within the defined scope.

Claims

1. A spatial laser beam combiner, characterized in that: include: A first laser light source (21), used for outputting a first laser beam (L1); A second laser light source (22), used for outputting a second laser beam (L2); A beam combining lens (23), comprising a first surface (231), a second surface (232) and a third surface (233); Wherein, the refractive index of the beam combining lens (23) is greater than the refractive index of air; After the first laser beam (L1) is incident on the beam-combining lens (23) from the first surface (231), the incident angle on the second surface (232) is greater than the critical angle of total reflection so that total reflection occurs to the third surface (233), and a deflection angle exists between the third surface (233) and the second surface (232) so that the incident angle of the first laser beam (L1) on the third surface (233) is less than the critical angle of total reflection, and the first laser beam (L1) is refracted from the third surface (233) to the outside of the beam-combining lens (23); After the second laser beam (L2) is incident on the beam-combining lens (23) from the second surface (232), it is refracted from the third surface (233) to the outside of the beam-combining lens (23) and overlaps with the first laser beam (L1).

2. The spatial laser beam combiner according to claim 1, characterized in that: The wavelength of the first laser beam (L1) is smaller than the wavelength of the second laser beam (L2).

3. The spatial laser beam combiner according to claim 2, characterized in that: The wavelength of the first laser beam (L1) is 500nm to 600nm, and the wavelength of the second laser beam (L2) is 1000nm to 1100nm.

4. The spatial laser beam combiner according to claim 1, characterized in that: The refractive index of the beam combining lens (23) is 1.5 to 2.

0.

5. The spatial laser beam combiner according to claim 1 or 4, characterized in that: The deflection angle between the third surface (233) and the second surface (232) is in a range of 15° to 45°.

6. The spatial laser beam combiner according to claim 1, characterized in that: The spatial laser beam combiner also includes a first collimator (24), which is arranged between the first laser light source (21) and the first surface (231) and is used for collimating the first laser light beam (L1) emitted by the first laser light source (21) and outputting the collimated first laser light beam to the first surface (231).

7. The spatial laser beam combiner according to claim 1 or 6, characterized in that: The spatial laser beam combiner also includes a second collimator (25), which is arranged between the second laser light source (22) and the second surface (232) and is used for collimating the second laser light beam (L2) emitted by the second laser light source (22) and outputting it to the second surface (232).

8. The spatial laser beam combiner according to claim 7, characterized in that: The spatial laser beam combiner also includes a focusing lens (26), which is arranged on a combined beam path of the first laser beam (L1) and the second laser beam (L2) after being refracted by the third surface (233), and is used to focus the first laser beam (L1) and the second laser beam (L2) after being refracted by the third surface (233).

9. A laser, characterized in that: It comprises the spatial laser beam combiner as described in any one of claims 1 to 8.

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