A heat dissipation assembly and a fiber laser

Abstract

The application provides a heat dissipation assembly and an optical fiber laser. The heat dissipation assembly comprises a heat dissipation fan and a heat conduction rib. The heat dissipation fan is installed on a structural member. One end of the structural member is an air inlet end, and the other end of the structural member is an air outlet end. The heat dissipation fan is located at the air outlet end. A heat generating element is arranged close to the air outlet end. The heat conduction rib is arranged on the surface of the structural member. The length direction of the heat conduction rib is arranged along a first direction. A pump source group is in abutment with the heat conduction rib. The first direction is the direction in which the air inlet end points to the air outlet end. The optical fiber laser comprises the heat dissipation assembly. The heat dissipation assembly can quickly take away the heat generated by the heat generating element through air flow by arranging the heat dissipation fan at the air outlet end of the structural member and arranging the heat generating element close to the air outlet end, so as to avoid the accumulation of heat inside the structural member. The heat generated by the pump source group is efficiently conducted to the air flow channel through the heat conduction rib, and the forced convection formed by the heat dissipation fan significantly improves the heat dissipation efficiency.

Description

Technical Field

[0001] This application belongs to the field of laser technology, and more specifically, relates to a heat dissipation component and a fiber laser. Background Technology

[0002] Currently, commercial high-power continuous-wave lasers (average output power greater than 2000W) generally employ water cooling. This is primarily because the pump source generates a large amount of heat during operation. If heat dissipation is insufficient, the laser can remain in a high-temperature environment for extended periods, leading to mode instability and even damage after short periods of operation. However, water-cooled fiber lasers suffer from significant portability drawbacks. Their laser processing procedures are complex, requiring auxiliary equipment such as water pumps, pipes, and heat exchangers to ensure stable operation. During long-term use, scale buildup in the water-cooling chamber can corrode the water channels, and there is also the risk of pipe leaks. In cold regions, antifreeze must be added to prevent freezing and subsequent rupture of the laser's water channels, increasing both operating and maintenance costs and hindering convenient outdoor use. Utility Model Content

[0003] The purpose of this application is to provide a heat dissipation component and a fiber laser to solve the technical problems of existing fiber lasers that use water cooling, resulting in poor portability and high operating costs.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: A fiber laser is provided for heat dissipation. The fiber laser includes a structural component and a pump source assembly and a heating element disposed on the structural component. The heat dissipation assembly includes a cooling fan and heat-conducting ribs. The cooling fan is mounted on the structural component. One end of the structural component is an air inlet, and the other end is an air outlet. The cooling fan is located at the air outlet. The heating element is disposed near the air outlet. The heat-conducting ribs are disposed on the surface of the structural component, and the length direction of the heat-conducting ribs is arranged along a first direction. The pump source assembly abuts against the heat-conducting ribs. The first direction is the direction from the air inlet to the air outlet.

[0005] Furthermore, the heat dissipation assembly also includes a temperature detection element, which is mounted on the structural component and is used to detect the temperature at the air outlet.

[0006] Furthermore, the heat dissipation assembly also includes a fan power driver board, which is electrically connected to the cooling fan and is used to control the speed of the cooling fan.

[0007] Furthermore, the heat dissipation assembly also includes a control board, which is electrically connected to the temperature detection element and the fan power drive board respectively. The control board is used to receive the temperature signal transmitted by the temperature detection element and control the fan power drive board to adjust the speed of the cooling fan according to a preset temperature threshold.

[0008] Furthermore, the cooling fan is provided in multiple units, and the multiple cooling fans are distributed at the air outlet end at a distance perpendicular to the first direction.

[0009] Furthermore, the heating element includes a power switch, a stripper, and a bundle combiner.

[0010] This application also provides a fiber laser, including the heat dissipation assembly described above, and the fiber laser further includes a pump assembly, a resonant cavity, a power amplifier module, and a laser output head connected in sequence.

[0011] Furthermore, the pumping assembly includes a first combiner and a plurality of first pump sources; the multi-fiber ends of the first combiner are connected to the plurality of first pump sources, and the signal end of the first combiner is connected to the resonant cavity.

[0012] Furthermore, the power amplification module includes a first active optical fiber, a second combiner, a first mode stripper, and a plurality of second pump sources. One end of the first active optical fiber is connected to the resonant cavity, and the other end of the first active optical fiber is connected to the combiner. The multi-fiber end of the combiner is connected to the plurality of second pump sources. The signal end of the second combiner is connected to the first mode stripper, and the output end of the first mode stripper is connected to the laser output head.

[0013] Furthermore, the fiber laser also includes a mode field converter, a wavelength division multiplexer, a guide light, and a photodetector; one end of the mode field converter is connected to the signal end of the first beam combiner; the other end of the mode field converter is connected to the single-fiber end of the wavelength division multiplexer, and the dual-fiber ends of the wavelength division multiplexer are respectively connected to the guide light and the photodetector.

[0014] The advantages of the heat dissipation component and fiber laser provided in this application are as follows: Compared with the prior art, the heat dissipation component of this application, by placing the cooling fan at the air outlet end of the structural component and arranging the heat-generating element close to the air outlet end, can quickly remove the heat generated by the heat-generating element through airflow, avoiding heat accumulation inside the structural component; at the same time, the heat-conducting ribs on the surface of the structural component are arranged in the first direction from the air inlet end to the air outlet end, and the pump source group abuts against the heat-conducting ribs, so that the heat generated by the pump source group can be efficiently conducted to the airflow channel through the heat-conducting ribs, which, together with the forced convection formed by the cooling fan, significantly improves the heat dissipation efficiency. This design does not rely on a water cooling system, effectively simplifies the overall structure of the laser, reduces the dependence on auxiliary equipment, improves the portability of the equipment, and avoids the problems of scale corrosion, water leakage and low-temperature freezing caused by water cooling, reducing the cost of use and maintenance, and making the laser more suitable for complex environments such as outdoors. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a top view of the fiber laser provided in an embodiment of this application; Figure 2 This is a bottom-view structural diagram of a fiber laser provided in an embodiment of this application; Figure 3 This is a schematic diagram of the front view structure of a fiber laser provided in an embodiment of this application; Figure 4 This is a schematic diagram of the optical path structure of a fiber laser provided in an embodiment of this application; The following are the labeling elements in the figure: 100 - Structural component; 110 - Air inlet; 120 - Air outlet; 101 - Heat-conducting ribs; 200 - Cooling fan; 201 - Fan power driver board; 300-Control Panel; 401 - First bundle combiner; 402 - First pump source; 501 - Second bundle combiner; 502 - First stripper; 503 - Second pump source; 504 - Pump power supply drive board; 600-Laser output head; 701 - Mode-Field Converter; 702 - Wavelength Division Multiplexer; 801 - High-reflectivity grating; 802 - Low-reflectivity grating; 803 - Fiber disc structure. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0020] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] Please refer to the following: Figure 1 and Figure 3 The heat dissipation assembly provided in the embodiments of this application will now be described. This heat dissipation assembly is used for heat dissipation of a fiber laser. The heat dissipation assembly includes a structural component 100 and a pump source assembly and a heating element disposed on the structural component 100. The heat dissipation assembly includes a cooling fan 200 and heat-conducting ribs 101. The cooling fan 200 is mounted on the structural component 100. One end of the structural component 100 is an air inlet 110, and the other end is an air outlet 120. The cooling fan 200 is located at the air outlet 120. The heating element is disposed near the air outlet 120. The heat-conducting ribs 101 are disposed on the surface of the structural component 100, and the length direction of the heat-conducting ribs 101 is arranged along a first direction. The pump source assembly abuts against the heat-conducting ribs 101. The first direction is the direction from the air inlet 110 to the air outlet 120.

[0022] Compared with the prior art, the fiber laser provided in this application has a heat dissipation component that, by placing a cooling fan 200 at the air outlet 120 of the structural component 100 and arranging the heat-generating element close to the air outlet 120, can quickly remove the heat generated by the heat-generating element through airflow, preventing heat accumulation inside the structural component 100. Simultaneously, the heat-conducting ribs 101 on the surface of the structural component 100 are arranged in a first direction from the air inlet 110 to the air outlet 120, and the pump source group abuts against the heat-conducting ribs 101. The heat generated by the pump source group can be efficiently conducted to the airflow channel through the heat-conducting ribs 101, and the forced convection formed by the cooling fan 200 significantly improves heat dissipation efficiency. This design eliminates the need for a water-cooling system, effectively simplifying the overall structure of the laser, reducing reliance on auxiliary equipment, improving the portability of the device, and avoiding problems such as scale corrosion, leakage, and low-temperature freezing associated with water cooling methods. This reduces usage and maintenance costs, making the laser more suitable for complex environments such as outdoor environments.

[0023] In this embodiment, the heat-conducting rib 101 can be made of copper. The thermal conductivity of copper is 401 W / (mK), while that of aluminum alloy is 205 W / (mK). The thermal conductivity of copper is nearly twice that of aluminum alloy. Copper not only has a much higher thermal conductivity than aluminum alloy, but it can also fit closely with the pump source group, further shortening the heat transfer path and quickly conducting the heat generated by the pump source group to the air outlet 120, thus dissipating the heat in a timely manner.

[0024] In one embodiment of this application, the heat dissipation assembly further includes a temperature sensing element mounted on the structural member 100, which is used to detect the temperature at the air outlet 120.

[0025] In this embodiment, the temperature detection element enables real-time monitoring of the temperature status of the air outlet 120, providing crucial temperature data support for the intelligent control of the cooling fan 200. Simultaneously, the temperature detection element also facilitates fault diagnosis; if the temperature of the air outlet 120 rises abnormally, it can be promptly fed back to the control system, reminding the user to inspect and maintain the equipment, thus preventing damage due to overheating.

[0026] In one embodiment of this application, please refer to Figure 2 The heat dissipation assembly also includes a fan power driver board 201, which is electrically connected to the cooling fan 200 and is used to control the speed of the cooling fan 200.

[0027] In this embodiment, the fan power driver board 201 receives real-time temperature signals from the temperature detection element and dynamically adjusts the voltage or current output to the cooling fan 200 according to a preset temperature threshold algorithm, thereby achieving precise control of the cooling fan 200 speed. When the temperature at the air outlet 120 is low, the driver board reduces the fan speed to reduce energy consumption and noise; as the temperature rises, the driver board gradually increases the speed to enhance heat dissipation capacity, ensuring a dynamic balance between heat dissipation efficiency and energy consumption, and further improving the intelligence level and operational stability of the heat dissipation components.

[0028] In one embodiment of this application, please refer to Figure 2 The heat dissipation assembly also includes a control board 300, which is electrically connected to the temperature detection element and the fan power drive board 201. The control board 300 is used to receive the temperature signal transmitted by the temperature detection element and control the fan power drive board 201 to adjust the speed of the cooling fan 200 according to the preset temperature threshold.

[0029] In this embodiment, the control board 300 serves as the core control unit of the heat dissipation component, and incorporates multiple sets of temperature threshold parameters and corresponding software algorithms for fan speed adjustment logic. When the temperature detected by the temperature detection element is lower than the set threshold, the speed of the cooling fan 200 is reduced to achieve energy saving; when the temperature is higher than the set threshold, the speed of the cooling fan 200 is increased to enhance the heat dissipation effect, ensuring that the fiber laser can maintain good heat dissipation and stable operation under different operating conditions.

[0030] During the operation of the fiber laser, when the control board 300 reads that the temperature is higher than the set threshold, it actively sends a command to shut down the fiber laser. To achieve energy saving, the software algorithm of the control board 300 can realize the frequency conversion effect of the cooling fan 200. For example, when the fiber laser is at 50% full power and the temperature detected by the temperature detection element is lower than 45°C, the cooling fan 200 runs at a low speed (e.g., 10,000 rpm). When the fiber laser is higher than 50% power or the detected temperature is higher than 45°C, the cooling fan 200 reaches the maximum speed (e.g., 16,500 rpm).

[0031] Specifically, the temperature sensing element can be a thermistor, which, in conjunction with other components in the circuit, converts temperature changes into changes in resistance, which are then recognized by the control board 300 and converted into a digital temperature signal. This type of thermistor has advantages such as high sensitivity, fast response speed, and low cost, meeting the real-time and accuracy requirements of the heat dissipation assembly for temperature detection. In actual installation, the thermistor is typically placed close to the inner wall of the air outlet 120 of the structural component 100 to directly sense the airflow temperature and reduce detection errors caused by environmental interference.

[0032] In one embodiment of this application, please refer to Figure 2 The heat dissipation assembly also includes a pump power driver board 504, which is electrically connected to the control board 300. This board provides a stable operating voltage and current to the pump source group, ensuring stable operation under different power outputs. The pump power driver board 504 receives control signals from the control board 300 and dynamically adjusts the output parameters according to the operating state of the fiber laser. When the laser is in high-power mode, the driver board increases the output current to meet the power requirements of the pump source group, while in low-power mode, it reduces the output to achieve efficient energy utilization. Simultaneously, the pump power driver board 504 also features overcurrent, overvoltage, and overtemperature protection functions. When an abnormal situation is detected, it can quickly cut off the output to protect the pump source group and the entire laser.

[0033] In one embodiment of this application, please refer to Figure 3 Multiple cooling fans 200 are provided, and the multiple cooling fans 200 are distributed at the air outlet 120 at a distance perpendicular to the first direction.

[0034] In this embodiment, multiple cooling fans 200 are arranged at equal intervals along an axis perpendicular to the first direction, forming a linear layout. This design significantly increases the effective ventilation area of ​​the exhaust end 120 and improves the airflow per unit time. Simultaneously, by controlling the independent speed of each cooling fan 200 through the control board 300, the operating status of each fan can be dynamically adjusted according to the temperature distribution in different areas. For example, when a higher temperature is detected on one side of the exhaust end 120, the speed of the corresponding fan can be increased individually, achieving precise heat dissipation and preventing the overall heat dissipation efficiency from being affected by localized heat accumulation. Furthermore, the spacing distribution structure reduces airflow interference between fans, lowers noise caused by turbulent airflow, and facilitates the disassembly and replacement of individual faulty fans during later maintenance without requiring the complete removal of the heat dissipation assembly, effectively improving the ease of equipment maintenance.

[0035] Specifically, the cooling fan 200 can be a cooling fan with a maximum speed of 16,500 rpm. The number of cooling fans 200 can be set to 15, with 15 fans 200 evenly distributed to ensure stable output of the fiber laser when the output optical power is greater than 4000W, with an output optical power stability of less than 2%. In other words, the specific number of cooling fans 200 can be adjusted according to actual heat dissipation requirements and the size of structural component 100. For example, it can be increased to 20 in lasers with higher optical power, while it can be reduced to 8 in miniaturized devices. Finite element simulation software is used to simulate and analyze the airflow and temperature field distribution of different numbers of fans to determine the optimal number of fans and spacing parameters, ensuring that heat dissipation efficiency is met while also considering the compactness and cost control of the equipment.

[0036] In one embodiment of this application, the heating element includes a power switch, a stripper, and a bundler.

[0037] In this embodiment, the power switch generates heat due to instantaneous current during laser switching, the mode stripper generates heat due to mechanical friction and energy loss when stripping the fiber coating, and the beam combiner generates heat due to differences in energy conversion efficiency during the coupling of multiple pump beams. These heat-generating components are positioned close to the exhaust end 120, allowing the heat generated during operation to be quickly carried away by the airflow from the cooling fan 200. This shortens the heat retention time within the structural component 100 and prevents adverse effects on the performance of surrounding optical components due to excessively high local temperatures, such as preventing laser wavelength shift or power instability caused by temperature drift. Simultaneously, concentrating these main heat sources at the end of the airflow channel creates an efficient heat dissipation path, complementing the heat dissipation method of the pump source group via heat-conducting ribs 101, and jointly improving the heat dissipation uniformity and reliability of the entire fiber laser.

[0038] In one embodiment of this application, the structural component 100 is made of aluminum alloy. Aluminum alloy has the characteristics of low density, excellent thermal conductivity, and good processing performance, which can provide a good basic heat conduction carrier for the heat dissipation component while ensuring the lightweight of the structural component 100. The edge of the structural component 100 is provided with heat dissipation denticles to further expand the heat dissipation area and accelerate the diffusion of heat to the external environment. The heat dissipation denticles are densely distributed but relatively thin, and the sides are reinforced with metal strips to ensure the stability of the structural component 100 while reducing wind resistance.

[0039] This application also provides a fiber laser, including the aforementioned heat dissipation components, which please refer to in conjunction with the above description. Figure 1 and Figure 4 The fiber laser also includes a pump assembly, a resonant cavity, a power amplifier module, and a laser output head 600 connected in sequence.

[0040] In this embodiment, the pump assembly provides initial pump light energy, which is then amplified and fed back by the resonant cavity to form a stable laser. The laser power is further increased by the power amplifier module, and finally, the laser output head 600 achieves stable high-power laser output. The heat dissipation assembly efficiently dissipates heat from the pump source assembly, resonant cavity, and power amplifier module, ensuring that the temperature of each core component is controlled within a safe range during high-power laser operation. This guarantees the long-term stable operation of the fiber laser and the beam quality of the output laser.

[0041] Figure 4In this embodiment, BQH represents the laser output head 600. The laser output head 600 has a quartz block with high light transmittance and good mechanical strength. It can effectively protect the internal optical components from external environmental pollution and damage, while reducing the energy loss of the laser during the output process and ensuring that the laser is output stably with high efficiency.

[0042] In one embodiment of this application, please refer to the following: Figure 1 and Figure 4 The pump assembly includes a first combiner 401 and a plurality of first pump sources 402; the multi-fiber ends of the first combiner 401 are connected to the plurality of first pump sources 402, and the signal end of the first combiner 401 is connected to the resonant cavity.

[0043] like Figure 4 As shown in the figure, MPC1 represents the first beam combiner 401, and PUMP1 represents the first pump source 402. In this embodiment, multiple pump beams are injected into the multi-fiber ends of the first beam combiner 401, and the optical power is combined using the fiber fused taper or lens coupling structure inside the beam combiner. The combined pump light is then efficiently transmitted to the resonant cavity from the signal end, providing initial energy for laser oscillation. This design of parallel input of multiple pump sources can significantly improve the total power of the pump light. At the same time, by reasonably distributing the output power of each pump source, the load on a single pump source can be reduced, its lifespan extended, and the stability of the pump light improved, laying a reliable energy foundation for the subsequent laser generation and power amplification module of the resonant cavity.

[0044] In one embodiment of this application, please refer to the following: Figure 1 and Figure 4 The power amplifier module includes a first active optical fiber, a second combiner 501, a first mode stripper 502, and multiple second pump sources 503. One end of the first active optical fiber is connected to the resonant cavity, and the other end of the first active optical fiber is connected to the combiner. The multi-fiber end of the combiner is connected to the multiple second pump sources 503. The signal end of the second combiner 501 is connected to the first mode stripper 502, and the output end of the first mode stripper 502 is connected to the laser output head 600.

[0045] like Figure 4As shown in the figure, YDF1 represents the first active fiber, MPC2 represents the second combiner 501, CPS1 represents the first mode stripper 502, and PUMP2 represents the second pump source 503. In this embodiment, the seed laser generated by the resonant cavity first enters the first active fiber. The second combiner 501 combines the pump lights output from multiple second pump sources 503 and injects them into the first active fiber through its signal end, providing energy for the amplification of the seed laser. Under the excitation of the pump light, the first active fiber achieves population inversion and stimulates amplification of the seed laser. During the transmission of the amplified laser, cladding light may be generated along the fiber cladding. The first mode stripper 502 can effectively strip away this cladding light to prevent it from entering the subsequent optical path and affecting the laser output quality. The laser after mode stripping is finally stably output through the laser output head 600. This structural design, through the synergistic effect of multi-stage pumping and amplification, can significantly improve the output power of the fiber laser. At the same time, the introduction of the mode stripper further ensures the beam purity and stability of the output laser.

[0046] In this embodiment, the switching of the first pump source 402 and the second pump source 503 adopts PWM control technology. By precisely adjusting the pulse width, linear control of the pump source output power is achieved. This ensures that the average power output meets the standard while avoiding excessive voltage division and heat accumulation in the field-effect transistor when the laser is operating at low power, thus ensuring that the circuit part of the fiber laser operates in a safe and stable state.

[0047] In one embodiment of this application, please refer to the following: Figure 1 and Figure 4 The fiber laser also includes a mode field converter 701, a wavelength division multiplexer 702, a guide light, and a photodetector; one end of the mode field converter 701 is connected to the signal end of the first beam combiner 401; the other end of the mode field converter 701 is connected to the single fiber end of the wavelength division multiplexer 702, and the dual fiber ends of the wavelength division multiplexer 702 are respectively connected to the guide light and the photodetector.

[0048] In this embodiment, the mode field converter 701 is used to perform mode field matching on the laser output from the first combiner 401. By optimizing the transmission mode of the laser in the optical fiber, it reduces energy loss caused by mode field mismatch and ensures efficient coupling of the laser to the wavelength division multiplexer 702. The wavelength division multiplexer 702 plays a dual role of optical path integration and signal separation. Its single-fiber end receives the laser after mode field conversion, and its dual-fiber ends guide optical signals of different wavelengths respectively. One path is connected to the guide light, which is used to monitor the intensity distribution and direction of the laser transmission path in real time, providing a direct reference for optical path debugging and fault diagnosis. The other path is connected to a photodetector, which can convert the received optical signal into an electrical signal to realize real-time acquisition and feedback of key parameters such as laser power and wavelength stability. This design improves optical coupling efficiency through mode field conversion. With the synergistic work of wavelength division multiplexing and photodetector, an integrated optical path system integrating laser optimized transmission, status monitoring and parameter feedback is constructed, further enhancing the intelligent control capability and operational reliability of fiber lasers, and providing an important guarantee for the precise control of high-power laser output.

[0049] In this embodiment, the mode field converter 701 is equipped with a mode stripper. The mode stripper can simultaneously strip away the cladding light generated during laser transmission during mode field conversion, preventing the cladding light from accumulating inside the mode field converter 701 and causing localized overheating, thereby protecting the core optical structure of the mode field converter 701 from damage. For example... Figure 4 As shown in the figure, MFA+CPC represents the mode field converter 701 with a mode stripper, and WDM represents the wavelength division multiplexer 702.

[0050] In one embodiment of this application, please refer to the following: Figure 1 and Figure 4 The resonant cavity includes a high-reflectivity grating 801, a second active optical fiber, and a low-reflectivity grating 802 connected in sequence; the high-reflectivity grating 801 is connected to the first combiner 401; and the low-reflectivity grating 802 is connected to the first active optical fiber.

[0051] like Figure 4 As shown in the figure, the components within the dashed box represent the resonant cavity, with HR representing the high-reflectivity grating 801 and OC representing the low-reflectivity grating 802. In this embodiment, the resonant cavity forms a laser oscillation circuit through the cooperation of the high-reflectivity grating 801 and the low-reflectivity grating 802, ensuring stable particle oscillation to generate longitudinal modes. The high-reflectivity grating 801 has a reflectivity of over 99% for specific wavelength lasers, confining most of the laser energy within the resonant cavity for amplification. The low-reflectivity grating 802 acts as an output coupling mirror, allowing a small portion of the laser energy meeting the threshold condition to be output to the first active fiber. The second active fiber provides the working medium for the resonant cavity.

[0052] Specifically, both the first and second active optical fibers can be ytterbium-doped double-clad fibers. As a commonly used rare-earth-doped fiber, the ytterbium ions in the fiber core can achieve population inversion under the excitation of pump light, thereby providing gain for laser generation and amplification.

[0053] In one embodiment of this application, the structural member 100 includes a first surface and a second surface, which are two parallel and opposite surfaces of the structural member 100, i.e., the front and back surfaces of the structural member 100.

[0054] The first bundler 401, the first active optical fiber, the second bundler 501, the first mode stripper 502, the high-reflectivity grating 801, the second active optical fiber, and the low-reflectivity grating 802 are all disposed on the first surface of the structural member 100; the control board 300, the pump power drive board 504, the fan power drive board 201, and the multiple second pump sources 503 are all disposed on the second surface of the structural member 100; of the multiple first pump sources 402, some are disposed on the first surface of the structural member 100, and others are disposed on the second surface of the structural member 100; for example, in this embodiment, there are a total of three first pump sources 402, of which two first pump sources 402 are disposed on the first surface of the structural member 100, and the other first pump source 402 is disposed on the second surface of the structural member 100; there are six second pump sources 503, and all six second pump sources 503 are disposed on the second surface of the structural member 100.

[0055] This dual-sided layout design makes full use of the space resources of structural component 100, separating optical elements and electrical control components to effectively avoid the impact of electromagnetic interference on the stability of the optical system. The first side centrally houses the core optical path components, which can shorten the optical path length and reduce optical signal transmission loss, while facilitating intuitive monitoring of the optical path status through an external observation window. The second side integrates control and drive modules, which can shorten electrical connection lines, reduce signal delay, and allow for separate disassembly of the second side cover for maintenance without touching the optical components, reducing maintenance risks. In addition, the distributed arrangement of the first pump source 402 can balance the weight distribution on both sides of structural component 100, avoiding installation stress problems caused by unilateral weight imbalance, and further improve the heat dissipation efficiency of the pump source through dual-sided heat dissipation paths, ensuring its stability under long-term high-power operation.

[0056] In this embodiment, the first combiner 401 and the second combiner 501 are of the same model. Since there are three first pump sources 402 and six second pump sources 503, the first combiner 401 also has three idle ends. Two of the idle ends are connected together, and the other idle end is subjected to ball burning treatment to prevent the end face of the idle end from reflecting light, so as to avoid interference with the normal operation of the pump sources or damage to the internal structure of the combiner due to reflected light.

[0057] In one embodiment of this application, such as Figure 1 As shown, the first surface of the structural component 100 is also provided with a fiber optic coil structure 803. The fiber optic coil structure 803 is racetrack-shaped. The outer ring of the fiber optic coil structure 803 is used to install the first active optical fiber, and the inner ring of the fiber optic coil structure 803 is used to install the second active optical fiber. This racetrack-shaped design can provide sufficient bending radius space for the active optical fibers, avoiding mechanical damage or optical power loss caused by excessive bending of the optical fibers. The first active optical fiber in the outer ring and the second active optical fiber in the inner ring are arranged in an orderly manner through the fiber optic coil structure 803, reducing the cross-entanglement between the optical fibers and facilitating subsequent optical path debugging and maintenance.

[0058] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heat dissipation assembly for heat dissipation of a fiber laser, the fiber laser comprising a structural component and a pump source assembly and a heating element disposed on the structural component; characterized in that, The heat dissipation component includes: A cooling fan is mounted on the structural component; one end of the structural component is an air inlet, and the other end is an air outlet; the cooling fan is located at the air outlet; the heating element is positioned close to the air outlet. A heat-conducting rib is disposed on the surface of the structural component. The length direction of the heat-conducting rib is arranged along a first direction. The pump source assembly abuts against the heat-conducting rib. The first direction is the direction from the air inlet end to the air outlet end.

2. The heat dissipation assembly as described in claim 1, characterized in that, The heat dissipation assembly also includes a temperature detection element, which is mounted on the structural component and is used to detect the temperature at the air outlet.

3. The heat dissipation assembly as described in claim 2, characterized in that, The heat dissipation assembly also includes a fan power driver board, which is electrically connected to the cooling fan and is used to control the speed of the cooling fan.

4. The heat dissipation assembly as described in claim 3, characterized in that, The heat dissipation assembly also includes a control board, which is electrically connected to the temperature detection element and the fan power drive board respectively. The control board is used to receive the temperature signal transmitted by the temperature detection element and control the fan power drive board to adjust the speed of the cooling fan according to a preset temperature threshold.

5. The heat dissipation assembly as described in claim 1, characterized in that, The cooling fan is provided in multiple locations, and the multiple cooling fans are distributed at the air outlet end at a distance perpendicular to the first direction.

6. The heat dissipation assembly as described in any one of claims 1-5, characterized in that, The heating element includes a power switch, a stripper, and a bundler.

7. A fiber laser, characterized in that, Including the heat dissipation component as described in any one of claims 1-6, the fiber laser further includes a pump component, a resonant cavity, a power amplifier module, and a laser output head connected in sequence.

8. The fiber laser as described in claim 7, characterized in that, The pumping assembly includes a first combiner and a plurality of first pump sources; the multi-fiber ends of the first combiner are connected to the plurality of first pump sources, and the signal end of the first combiner is connected to the resonant cavity.

9. The fiber laser as described in claim 7, characterized in that, The power amplifier module includes a first active optical fiber, a second combiner, a first mode stripper, and multiple second pump sources. One end of the first active optical fiber is connected to the resonant cavity, and the other end of the first active optical fiber is connected to the combiner. The multi-fiber end of the combiner is connected to the multiple second pump sources. The signal end of the second combiner is connected to the first mode stripper, and the output end of the first mode stripper is connected to the laser output head.

10. The fiber laser as described in claim 8, characterized in that, It also includes a mode field converter, a wavelength division multiplexer, a guide light, and a photodetector; one end of the mode field converter is connected to the signal end of the first beam combiner; the other end of the mode field converter is connected to the single-fiber end of the wavelength division multiplexer, and the dual-fiber ends of the wavelength division multiplexer are respectively connected to the guide light and the photodetector.

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