Laser light path structure and laser system

Abstract

The application discloses a kind of laser optical path structure and laser system, laser optical path structure includes multiple pump sources, grating integrated combiner, main oscillation fiber and output coupling grating;The input end of grating integrated combiner is connected with the output end of multiple pump sources optical path;The input end of main oscillation fiber is connected with the output end of grating integrated combiner optical path, and the minimum radius of main oscillation fiber is greater than or equal to 50 millimeters;The input end of output coupling grating is connected with the output end of main oscillation fiber optical path.The optical path assembly provided in the embodiment of the application can increase the radius of the main oscillation fiber by making the minimum radius of the main oscillation fiber less than or equal to 60 millimeters, reduce the signal light transmitted in the cladding of the main oscillation fiber, make more signal light transmitted in the core of the main oscillation fiber, and be beneficial to improve the signal light power output by the laser optical path structure.

Description

Technical Field

[0001] This application relates to the field of laser technology, and in particular to a laser optical path structure and laser system. Background Technology

[0002] With the rapid development of laser technology, fiber lasers are being used more and more widely in industrial processing. To achieve better welding and cutting results, fiber lasers need to have both high power and good beam quality.

[0003] In related technologies, fiber lasers typically employ a master oscillator power-amplifier (MOPA) structure. Under the action of the pump source and resonant cavity, the master oscillator stage generates signal light, and the amplification stage absorbs the signal light within the cladding of the fiber, thereby amplifying the signal light with better beam quality within the fiber core to obtain a high-power, high-beam-quality laser.

[0004] However, the higher proportion of signal light transmitted in the cladding of the optical fiber can affect the output laser power of the fiber laser. Utility Model Content

[0005] This application provides a laser optical path structure and laser system, aiming to solve the technical problem that the high proportion of signal light transmitted in the cladding of the fiber in a fiber laser affects the output laser power of the fiber laser.

[0006] This application provides a laser optical path structure, including: Multiple pump sources; A grating-integrated beam combiner, wherein the input end of the grating-integrated beam combiner is connected to the optical path of the output end of the plurality of pump sources; The main oscillating fiber has its input end connected to the output end of the grating-integrated combiner, and the minimum radius of the main oscillating fiber is greater than or equal to 50 mm. An output coupling grating is provided, the input end of which is connected to the output end of the main oscillating fiber.

[0007] In some embodiments, the minimum radius of the master oscillation fiber is less than or equal to 60 mm.

[0008] In some embodiments, the laser optical path structure further includes a cooling plate, the cooling plate having an optical fiber slot for mounting the master oscillating optical fiber, the minimum radius of the optical fiber slot being greater than or equal to 50 mm.

[0009] In some embodiments, the fiber optic slot includes two arc-shaped slot segments and two straight slot segments alternately connected along its circumference, wherein the minimum radius of the arc-shaped slot segments is greater than or equal to 50 mm.

[0010] In some embodiments, the numerical aperture of the master oscillating fiber is greater than or equal to 0.065 and less than or equal to 0.075.

[0011] In some embodiments, the laser optical path structure further includes a stripper, the input end of which is optically connected to the output end of the output coupling grating, and the core diameter of the stripper is greater than or equal to 50 micrometers and less than or equal to 75 micrometers.

[0012] In some embodiments, the laser optical path structure further includes a laser output head, the input end of which is optically connected to the output end of the stripper, and the core diameter of the laser output head is greater than or equal to 50 micrometers and less than or equal to 75 micrometers.

[0013] In some embodiments, the core diameter of the output coupling grating (15) is greater than or equal to 20 micrometers and less than or equal to 75 micrometers.

[0014] In some embodiments, the grating-integrated beam combiner includes a high-reflectivity grating; the laser optical path structure further includes a power amplification fiber, which is disposed in the optical path between the output coupling grating and the mode stripper; the core diameter of the power amplification fiber (16) is greater than or equal to 25 micrometers and less than or equal to 35 micrometers.

[0015] This application embodiment also provides a laser system, the laser system including the laser optical path structure as described above, the laser optical path structure including: Multiple pump sources; A grating-integrated beam combiner, wherein the input end of the grating-integrated beam combiner is connected to the optical path of the output end of the plurality of pump sources; The main oscillating fiber has its input end connected to the output end of the grating-integrated combiner, and the minimum radius of the main oscillating fiber is greater than or equal to 50 mm. An output coupling grating is provided, the input end of which is connected to the output end of the main oscillating fiber.

[0016] The optical path assembly provided in this application connects the input end of a grating-integrated beam combiner to the output optical paths of multiple pump sources of the laser assembly, enabling the lasers output from multiple pump sources to be combined through the grating-integrated beam combiner. Simultaneously, the input end of the master oscillating fiber is connected to the output optical path of the grating-integrated beam combiner, and the input end of the output coupling grating is connected to the output optical path of the master oscillating fiber. This allows the laser beam combined by the grating-integrated beam combiner to be transmitted through the master oscillating fiber to the output coupling grating, and signal light is generated through the resonant cavity formed by the combination of the grating-integrated beam combiner and the output coupling grating. By making the minimum radius of the master oscillating fiber less than or equal to 60 mm, the radius of the master oscillating fiber can be increased, reducing the amount of signal light transmitted in the cladding of the master oscillating fiber. This allows more signal light to be transmitted within the core of the master oscillating fiber, which is beneficial for improving the output signal light power of the laser optical path structure. Attached Figure Description

[0017] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0018] Figure 1 A schematic diagram of one embodiment of the laser optical path structure provided in this application; Figure 2 A schematic diagram of another embodiment of the laser optical path structure provided in this application; Figure 3 This is a schematic diagram of one embodiment of the cooling plate provided in this application.

[0019] Explanation of reference numerals in the attached figures: 1-Laser optical path structure; 11-Signal light emitter; 12-Pump source; 13-Grating integrated beam combiner; 14-Main oscillation fiber; 15-Output coupling grating; 16-Power amplification fiber; 17-Mode stripper; 18-Mode field adapter; 19-Laser output head; 20-Cooling plate; 21-Fiber optic slot; 211-Arc slot segment; 212-Straight slot segment. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0025] This application provides a laser optical path structure and a laser system. These will be described in detail below.

[0026] First, this application provides a laser optical path structure.

[0027] Figure 1 This is a schematic diagram of one embodiment of the laser optical path structure provided in this application. Figure 1 As shown, the laser optical path structure 1 includes multiple pump sources 12, a grating-integrated beam combiner 13, a master oscillating fiber 14, and an output coupling grating 15. The input end of the grating-integrated beam combiner 13 is connected to the output optical path of the multiple pump sources 12, so that the lasers output from the multiple pump sources are combined through the grating-integrated beam combiner 13. The input end of the master oscillating fiber 14 is connected to the output optical path of the grating-integrated beam combiner 13, and the input end of the output coupling grating 15 is connected to the output optical path of the master oscillating fiber 14. Thus, the laser beam combined by the grating-integrated beam combiner 13 can be transmitted to the output coupling grating 15 through the master oscillating fiber 14, and a signal light is generated through the resonant cavity formed by the combination of the grating-integrated beam combiner 13 and the output coupling grating 15.

[0028] In this embodiment, the number of pump sources 12 is two, three, four, or more. Specifically, the number of pump sources 12 is three. The grating combiner 13 is a 3+1 integrated grating combiner. The outputs of the three pump sources 12 are all connected to the input of the grating combiner 13 via optical fibers.

[0029] In some embodiments, the grating-integrated beam combiner 13 may include a highly reflective grating. This allows the highly reflective grating of the grating-integrated beam combiner 13 and the output coupling grating 15 to stably form a resonant cavity.

[0030] In some embodiments, such as Figure 3As shown, the minimum radius of the master oscillating fiber 14 can be greater than or equal to 50 mm. This increases the radius of the master oscillating fiber 14, reduces the amount of signal light transmitted in the cladding of the master oscillating fiber 14, and allows more signal light to be transmitted within the core of the master oscillating fiber 14, which is beneficial for improving the output signal light power of the laser optical path structure.

[0031] The minimum radius of the master oscillation fiber 14 can be 52 mm, 53 mm, 55 mm, 57 mm, 58 mm, 59 mm, etc., and there is no restriction here.

[0032] Additionally, the minimum radius of the master oscillating fiber 14 can be less than or equal to 60 mm to avoid the master oscillating fiber 14 becoming too large and affecting the overall size of the laser optical path structure 1. The minimum radius of the master oscillating fiber 14 can be 51 mm, 54 mm, 56 mm, etc., and is not limited here.

[0033] like Figure 3 As shown, the laser optical path structure 1 may also include a cooling plate 20, which has an optical fiber slot 21 for mounting the master oscillating optical fiber 14. In some embodiments, the minimum radius D of the optical fiber slot 21 may be greater than or equal to 50 mm. Thus, when the master oscillating optical fiber 14 is installed in the optical fiber slot 21, the minimum radius of the master oscillating optical fiber 14 can be greater than or equal to 50 mm, thereby reducing the signal light transmitted in the cladding of the master oscillating optical fiber 14.

[0034] The minimum radius D of the fiber optic slot 21 can be 52 mm, 53 mm, 55 mm, 57 mm, 58 mm, 59 mm, etc., and there is no restriction here.

[0035] Additionally, the minimum radius D of the fiber optic slot 21 can be less than or equal to 60 mm. This ensures that after the main oscillating fiber 14 is installed in the fiber optic slot 21, the minimum radius of the main oscillating fiber 14 is less than or equal to 60 mm, thus preventing the main oscillating fiber 14 from being too large and affecting the overall size of the laser optical path structure 1. The minimum radius D of the fiber optic slot 21 can be 51 mm, 54 mm, 56 mm, etc., and is not limited here.

[0036] In some embodiments, the fiber optic slot 21 may include two arc-shaped slot segments 211 and two straight slot segments 212 alternately connected along its circumference, wherein the minimum radius D of the arc-shaped slot segments 211 is greater than or equal to 50 mm. This allows the minimum radius of the fiber optic slot 21 to be greater than or equal to 50 mm. Furthermore, the master oscillating fiber 14 installed in the straight slot segments 212 will not be bent substantially, which is beneficial for further reducing the signal light transmitted in the cladding of the master oscillating fiber 14.

[0037] The minimum radius D of the arc groove segment 211 can be 52 mm, 53 mm, 55 mm, 57 mm, 58 mm, 59 mm, etc., and there is no restriction here.

[0038] Additionally, the minimum radius D of the arc-shaped groove segment 211 can be less than or equal to 60 mm. This ensures that after the main oscillating fiber 14 is installed within the arc-shaped groove segment 211 of the fiber optic slot 21, the minimum radius of the main oscillating fiber 14 is less than or equal to 60 mm, thus preventing the main oscillating fiber 14 from becoming too large and affecting the overall size of the laser optical path structure 1. The minimum radius D of the arc-shaped groove segment 211 of the fiber optic slot 21 can be 51 mm, 54 mm, 56 mm, etc., and is not limited here.

[0039] In some embodiments, the numerical aperture of the master oscillating fiber 14 can be greater than or equal to 0.065, thereby allowing more beam to propagate within the core of the master oscillating fiber. This helps to reduce the proportion of signal light transmitted in the cladding of the master oscillating fiber, thereby increasing the laser power output of the fiber laser. The numerical aperture of the master oscillating fiber 14 can be 0.066, 0.068, 0.07, 0.072, 0.074, etc., depending on the requirements for beam quality, and is not limited here.

[0040] Additionally, the numerical aperture of the master oscillating fiber 14 can be less than or equal to 0.075 to avoid excessively large numerical apertures that could negatively impact beam quality. The numerical aperture of the master oscillating fiber 14 can be 0.073, 0.071, 0.069, 0.067, etc., and is not limited here.

[0041] In this embodiment of the application, the master oscillating fiber 14 can be a master oscillating ytterbium-doped fiber (MOYDF).

[0042] Continue to refer to Figure 1 The laser optical path structure 1 also includes a mode stripper 17 (CMS), the input end of which is connected to the output end of the output coupling grating 15. Thus, the mode stripper 17 can remove higher-order mode laser and pump light from the cladding of the optical fiber, thereby improving beam quality.

[0043] In some embodiments, the core diameter of the stripper 17 can be greater than or equal to 50 micrometers and less than or equal to 75 micrometers to reduce the stripping effect of the stripper 17 on the high-order mode laser and pump light in the cladding of the optical fiber, thereby further improving the beam power. The core diameter of the stripper 17 can be 51 micrometers, 53 micrometers, 55 micrometers, 56 micrometers, 60 micrometers, 70 micrometers, etc., and is not limited here.

[0044] In some embodiments, the diameter of the optical fiber of the stripper 17 may be 400 micrometers or other sizes, which are not limited here.

[0045] like Figure 1 As shown, the laser optical path structure 1 may further include a laser output head 19, the input end of which is optically connected to the output end of the mode stripper 17. Thus, after the high-order mode laser and pump light in the cladding of the optical fiber are stripped by the mode stripper 17, the laser in the fiber core can be transmitted to the laser output head 19 and output through the output end of the laser output head 19.

[0046] Specifically, the core diameter of the laser output head 19 can be greater than or equal to 50 micrometers and less than or equal to 75 micrometers, thereby further increasing the power of the beam within the core. Simultaneously, it avoids the problem of excessively high laser power density at the output end of the laser output head 19, which could lead to nonlinear effects, if the core diameter of the laser output head 19 is too small. The core diameter of the laser output head 19 can be 51 micrometers, 52 micrometers, 54 micrometers, 60 micrometers, 65 micrometers, 70 micrometers, etc., and is not limited here.

[0047] In some embodiments, the diameter of the optical fiber of the laser output head 19 may be 250 micrometers or other sizes, which are not limited here.

[0048] In some embodiments, such as Figure 1 As shown, the laser optical path structure 1 may further include a mode field adapter 18, which is disposed in the optical path between the mode stripper 17 and the laser output head 19. By providing the mode field adapter 18 between the mode stripper 17 and the laser output head 19, the coupling loss between the mode stripper 17 and the laser output head 19 can be reduced, further improving the beam quality.

[0049] In some embodiments, such as Figure 1 As shown, the laser optical path structure 1 may further include a power amplification fiber 16, which is disposed in the optical path between the output coupling grating 15 and the mode stripper 17. Thus, the signal light can be amplified through the power amplification fiber 16, ensuring high beam quality of the output laser while achieving high power and high energy output. The power amplification fiber 16 can be a power-amplifier ytterbium-doped fiber (MOYDF).

[0050] The core diameter of the power amplification fiber 16 can be greater than or equal to 25 micrometers and less than or equal to 35 micrometers, so as to improve the beam power transmitted in the power amplification fiber 16, thereby improving the signal light power output by the laser optical path structure.

[0051] The core diameter of the power amplification fiber 16 can be 26 micrometers, 27 micrometers, 30 micrometers, 32 micrometers, 34 micrometers, etc., and there is no limitation here.

[0052] In some embodiments, the laser optical path structure 1 further includes a signal light transmitter 11, the output end of which is optically connected to the input end of the grating-integrated beam combiner 13. Thus, the signal light emitted by the signal transmitter can sequentially pass through the grating-integrated beam combiner 13, the master oscillating fiber 14, the output coupling grating 15, the power amplifying fiber 16, the mode stripper 17, the mode field adapter 18, and the laser output head 19, and be transmitted from the output end of the laser output head 19 to the surface of the workpiece to be processed, so as to mark the processing location on the surface of the workpiece.

[0053] The signal light transmitter 11 can be a red laser diode or other transmitters capable of emitting signal light; there are no restrictions here.

[0054] Figure 2 This is a schematic diagram of another embodiment of the laser optical path structure provided in this application. In other embodiments, such as... Figure 2 As shown, the laser optical path structure 1 can also exclude the mode field adapter 18. In this case, the output end of the mode stripper 17 is directly connected to the input optical path of the laser output head 19. Specifically, the fiber diameter at the output end of the mode stripper 17 can be approximately equal to the fiber diameter at the input end of the laser output head 19, and the core diameter of the fiber at the output end of the mode stripper 17 can be approximately equal to the core diameter of the fiber at the input end of the laser output head 19. This reduces coupling loss between the mode stripper 17 and the laser output head 19 after connecting their optical paths, further improving beam quality.

[0055] Specifically, the fiber diameter of the stripper 17 can be 400 micrometers, and the core diameter can be 50 micrometers. The fiber diameter of the laser output head 19 can be 400 micrometers, and the core diameter can be 50 micrometers. Of course, the fiber diameter and core diameter of the stripper 17, and the fiber diameter and core diameter of the laser output head 19 can also be other sizes, which are not limited here.

[0056] This application also provides a laser system, which includes a laser optical path structure. The specific structure of the laser optical path structure is as described in the above embodiments. Since this laser system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0057] The laser system may also include a power supply that provides current to the pump source 12, a housing that provides support for the laser optical path structure, etc., without limitation.

[0058] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0059] The above provides a detailed description of a laser optical path structure and laser system provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A laser optical path structure (1), characterized in that, include: Multiple pump sources (12); A grating-integrated beam combiner (13) is provided, with its input end connected to the output optical path of the plurality of pump sources (12). The main oscillating fiber (14) has its input end connected to the output end of the grating-integrated bundle combiner (13) via an optical path, and the minimum radius of the main oscillating fiber (14) is greater than or equal to 50 mm. An output coupling grating (15) is provided, the input end of which is connected to the output end of the main oscillating fiber (14).

2. The laser optical path structure (1) as described in claim 1, characterized in that, The minimum radius of the master oscillation fiber (14) is less than or equal to 60 mm.

3. The laser optical path structure (1) as described in claim 1, characterized in that, The laser optical path structure (1) also includes a cooling plate (20), which is provided with an optical fiber slot (21) for mounting the main oscillation optical fiber (14), and the minimum radius (D) of the optical fiber slot (21) is greater than or equal to 50 mm.

4. The laser optical path structure (1) as described in claim 3, characterized in that, The fiber optic slot (21) includes two arc-shaped slot segments (211) and two straight slot segments (212) that are alternately connected along its circumference, wherein the minimum radius (D) of the arc-shaped slot segment (211) is greater than or equal to 50 mm.

5. The laser optical path structure (1) as described in claim 1, characterized in that, The numerical aperture of the master oscillating fiber (14) is greater than or equal to 0.065 and less than or equal to 0.

075.

6. The laser optical path structure (1) as described in any one of claims 1 to 5, characterized in that, The laser optical path structure (1) also includes a stripper (17), the input end of which is connected to the output end of the output coupling grating (15) optical path, and the core diameter of the stripper (17) is greater than or equal to 50 micrometers and less than or equal to 75 micrometers.

7. The laser optical path structure (1) as described in claim 6, characterized in that, The laser optical path structure (1) also includes a laser output head (19), the input end of which is connected to the output end of the stripper (17) via an optical path. The core diameter of the laser output head (19) is greater than or equal to 50 micrometers and less than or equal to 75 micrometers.

8. The laser optical path structure (1) as described in any one of claims 1 to 5, characterized in that, The core diameter of the output coupling grating (15) is greater than or equal to 20 micrometers and less than or equal to 75 micrometers.

9. The laser optical path structure (1) as described in claim 6, characterized in that, The grating-integrated beam combiner (13) includes a high-reflectivity grating; the laser optical path structure (1) also includes a power amplification fiber (16), which is disposed on the optical path between the output coupling grating (15) and the mode stripper (17); the core diameter of the power amplification fiber (16) is greater than or equal to 25 micrometers and less than or equal to 35 micrometers.

10. A laser system, characterized in that, The laser system includes the laser optical path structure (1) as described in any one of claims 1 to 9.

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