Laser heat sink and laser module

Abstract

This application provides a laser heat sink and laser module, including a heat sink and fins. The heat sink has a fluid channel, and a laser unit is mounted on the side of the heat sink opposite to the fluid channel. The heat sink also has a liquid inlet and a liquid outlet, and the fluid channel connects the liquid inlet and the liquid outlet. A flow-diverting region is provided at the end of the fluid channel near the liquid inlet. The fins are installed within the fluid channel, and the fins divide at least a portion of the fluid channel into multiple branch channels. The liquid inlet end of each branch channel is connected to the liquid inlet through the flow-diverting region. The laser heat sink provided by this application utilizes fins to divide the fluid channel into multiple branch channels, resulting in a simple structure and improved heat dissipation efficiency.

Description

Technical Field

[0001] This application relates to the field of laser technology, specifically to a laser heat sink and a laser module. Background Technology

[0002] With the rapid development of laser technology, the performance and reliability of high-power lasers have become crucial in numerous application fields. Among these, the thermal management of lasers is particularly important. Heat sinks, as a core component of the laser's thermal management system, directly affect the overall performance of the laser. During laser operation, a large amount of heat energy is generated. If this heat energy cannot be effectively dissipated in time, the internal temperature of the laser will rise, affecting its output power, beam quality, and lifespan. Therefore, the main function of a heat sink is to rapidly absorb this heat from the laser chip or other heat-generating components and, through its excellent thermal conductivity, distribute the heat over a larger area, ultimately dissipating it through a heat dissipation system. However, existing stepped heat sinks suffer from low heat dissipation efficiency and complex structures. Utility Model Content

[0003] The main technical problem addressed in this application is to provide a laser heat sink and a laser module to improve the heat dissipation efficiency of the laser heat sink.

[0004] One embodiment of this application provides a laser heat sink, including:

[0005] A heat sink is provided with a fluid channel. A laser unit is installed on the side of the heat sink away from the fluid channel. The heat sink is also provided with a liquid inlet and a liquid outlet. The fluid channel connects the liquid inlet and the liquid outlet. A diversion area is provided at the end of the fluid channel near the liquid inlet.

[0006] Fins are installed in the fluid channel, and the fins divide at least a portion of the fluid channel into multiple branch channels. The inlet end of the branch channel is connected to the inlet through the diversion area.

[0007] According to one embodiment of this application, the heat sink includes a first end and a second end away from the first end. The liquid inlet and the liquid outlet are located at the first end. A separator is connected to the first end. The fluid channel includes an inlet channel, an outlet channel, and a transition channel. The separator is located between the inlet channel and the outlet channel. The inlet channel is connected to the inlet. The outlet channel is connected to the outlet. The transition channel is located at the second end and connects the inlet channel and the outlet channel.

[0008] According to one embodiment of this application, the fluid channel has a confluence area at one end near the outlet, and the outlet end of the branch channel is connected to the outlet through the confluence area.

[0009] According to one embodiment of this application, the fin includes a flow-diverting section disposed near the liquid inlet. The number of the flow-diverting sections is plurality of, and the plurality of flow-diverting sections are configured such that the flow-diverting section that is closer to the liquid inlet in a first direction is closer to the liquid inlet in a second direction, wherein the first direction is perpendicular to the plane where the flow-diverting section is located, and the second direction is perpendicular to the plane where the liquid inlet is located.

[0010] According to one embodiment of this application, the fin includes a first fin and two second fins, the two second fins being respectively disposed on both sides of the first fin, the flow-diverting section of the first fin being closer to the center of the liquid inlet in the first direction than the flow-diverting section of the second fin, and the flow-diverting section of the first fin being closer to the liquid inlet in the second direction than the flow-diverting section of the second fin.

[0011] According to one embodiment of this application, the cross-sectional area of ​​the diversion region gradually increases in the direction away from the inlet.

[0012] According to one embodiment of this application, the heat sink has multiple steps on the side away from the fluid channel. The multiple steps are distributed in a stepped, inclined manner. The steps are used to install the laser unit. The fluid channel is inclined near the bottom wall of the steps. The inclined direction of the bottom wall corresponds to the inclined direction of the multiple steps.

[0013] According to one embodiment of this application, the plurality of steps are distributed along a direction away from the liquid inlet, and the number of laser units installed on the steps farther away from the liquid inlet is less.

[0014] According to one embodiment of this application, the laser heat sink further includes a sealing cover, the sealing cover and the heat sink being sealed together, and the fluid channel being formed between the sealing cover and the heat sink.

[0015] This application also provides a laser module, which includes the laser heat sink described in the above embodiments, and further includes a laser unit mounted on the laser heat sink.

[0016] The laser heat sink provided in this application uses fins to divide the fluid channel into multiple branch channels, and connects the liquid inlet of each branch channel to the liquid inlet through a diversion area. The laser heat sink has a simple structure, which is beneficial to improving heat dissipation efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the laser heat sink of this application;

[0019] Figure 2 yes Figure 1 A partial structural diagram of the laser heat sink from another angle is shown.

[0020] Figure 3 This is a schematic diagram of another embodiment of the laser heat sink of this application;

[0021] Figure 4 This is a schematic diagram of the structure of an embodiment of the laser module of this application.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] Laser heat sink 10, heat sink 110, fluid channel 101, liquid inlet channel 1011, liquid outlet channel 1012, transition channel 1013, liquid inlet 102, liquid outlet 103, branch channel 104, diversion area 105, confluence area 106, first end 111, second end 112, separator 113, step 114, bottom wall 115, first surface 116, second surface 117, third surface 118, fin 120, diversion section 121, first fin 122, second fin 123, confluence section 124, sealing cover 130, laser unit 20, second direction Y, first direction X. Detailed Implementation

[0024] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0025] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] This application provides a laser heat sink 10, such as Figure 1 , Figure 2 and Figure 4As shown, the laser heat sink 10 includes a heat sink 110 and fins 120. The heat sink 110 has a fluid channel 101, and a laser unit 20 is installed on the side of the heat sink 110 away from the fluid channel 101. The heat sink 110 also has a liquid inlet 102 and a liquid outlet 103. The fluid channel 101 connects the liquid inlet 102 and the liquid outlet 103. A diversion area 105 is provided at the end of the fluid channel 101 near the liquid inlet 102. The fins 120 are installed in the fluid channel 101 and divide at least a portion of the fluid channel 101 into multiple branch channels 104. The liquid inlet end of the branch channel 104 is connected to the liquid inlet 102 through the diversion area 105. External cooling fluid and other heat dissipation media can enter the fluid channel 101 through the liquid inlet 102. When the heat dissipation media encounters the fins 120, it can be diverted by the fins 120 to the branch channels 104. The fins 120 increase the contact area between the heat dissipation medium and the laser heat sink 10, thereby increasing the heat dissipation area and allowing heat to be more evenly distributed in the branch channels 104, thus improving the overall heat dissipation efficiency. Furthermore, each branch channel 104 effectively removes a portion of the heat, reducing heat concentration and localized overheating. Simultaneously, the design of multiple branch channels 104 optimizes the fluid flow path, reduces flow resistance, and improves the fluid's heat transfer efficiency.

[0028] In some embodiments, a confluence region 106 is provided at one end of the fluid channel 101 near the outlet 103, and the outlet end of the branch channel 104 is connected to the outlet 103 through the confluence region 106. The heat dissipation medium entering the fluid channel 101 through the inlet 102 can be divided into multiple branch channels 104 by the fins 120 in the diversion region 105. After the heat dissipation medium flows along the branch channels 104 to the outlet end, the heat dissipation medium of the multiple branch channels 104 can be merged in the confluence region 106 and flow out from the outlet 103.

[0029] In some embodiments, such as Figure 1 and Figure 2 As shown, the heat sink 110 includes a first end 111 and a second end 112 away from the first end 111. The inlet 102 and the outlet 103 are located at the first end 111. The first end 111 is connected to a partition 113. The fluid channel 101 includes an inlet channel 1011, an outlet channel 1012 and a transition channel 1013. The partition 113 is located between the inlet channel 1011 and the outlet channel 1012. The inlet channel 1011 is connected to the inlet 102, the outlet channel 1012 is connected to the outlet 103, and the transition channel 1013 is located at the second end 112. The transition channel 1013 is connected to the inlet channel 1011 and the outlet channel 1012.

[0030] In some embodiments, the separator 113 extends from the first end 111 toward the transition channel 1013, separating the liquid inlet channel 1011 and the liquid outlet channel 1012. The liquid inlet 102 and the liquid outlet 103 are located on opposite sides of the surface where the separator 113 is located. The fact that the liquid inlet 102 and the liquid outlet 103 are located at the same end of the heat sink 110 facilitates connection between the laser heat sink 10 and external cooling equipment, and facilitates the formation of a liquid circulation for the heat dissipation medium.

[0031] In some embodiments, the transition channel 1013 is arc-shaped so that the heat dissipation medium can transition smoothly in the transition channel 1013, reducing the loss caused by impact turbulence, further optimizing the fluid flow path, reducing flow resistance, and improving the heat transfer efficiency of the fluid.

[0032] In some embodiments, the length directions of the inlet channel 1011 and the outlet channel 1012 are both parallel to the length direction of the heat sink 110, and the fluid channel 101 is approximately U-shaped.

[0033] In some other embodiments, such as Figure 3 As shown, the liquid inlet 102 is located at the first end 111 of the heat sink 110, and the liquid outlet 103 is located at the second end 112 of the heat sink 110. The fluid channel 101 extends along the length of the heat sink 110, and the length direction of the fins 120 is parallel to the length direction of the heat sink 110. The heat dissipation medium can enter the fluid channel 101 from the liquid inlet 102, be diverted by the fins 120 to the branch channel 104, and flow from the first end 111 to the second end 112, and finally flow out from the liquid outlet 103.

[0034] In some embodiments, such as Figure 1 and Figure 4 As shown, the heat sink 110 includes a first surface 116 and a second surface 117 arranged opposite to each other. The fluid channel 101 is disposed on the first surface 116, and the laser unit 20 is disposed on the second surface 117. The heat sink 110 also includes a third surface 118 perpendicular to the first surface 116, and both the liquid inlet 102 and the liquid outlet 103 are disposed on the third surface 118.

[0035] In some embodiments, the heat sink 110 is generally rectangular in shape, with the first surface 116 and the second surface 117 arranged in parallel, and the third surface 118 perpendicular to the first surface 116 and the second surface 117. In some other embodiments, the heat sink 110 may also be shaped like a frustum or a truncated cone.

[0036] In some embodiments, the first surface 116 is provided with a first groove, the partition piece 113 is inserted into the first groove, and the fluid channel 101 is formed between the sidewall of the first groove and the partition piece 113.

[0037] In some embodiments, the heat sink 110 has multiple steps 114 on the side opposite to the fluid channel 101. These steps 114 are arranged in a stepped, inclined manner. The steps 114 are used to mount the laser unit 20. The bottom wall 115 of the fluid channel 101 near the steps 114 is inclined, and the inclination direction of the bottom wall 115 corresponds to the inclination direction of the multiple steps 114. The arrangement of the laser units 20 on the multiple steps 114 ensures that the optical paths of the laser units 20 on different steps 114 do not interfere with each other, allowing the laser units 20 to be arranged as closely as possible, resulting in high overall product integration and a smaller size. Simultaneously, the structure of the multiple steps 114 increases the heat dissipation surface area. Combined with the inclined arrangement of the bottom wall 115 of the fluid channel 101, the heat from the laser unit 20 can be quickly conducted to the heat dissipation medium within the fluid channel 101, improving heat dissipation efficiency.

[0038] In some embodiments, the laser unit 20 is mounted on the step surface of the step 114 away from the first surface 116. The distance from the step surface of different steps 114 away from the first surface 116 to the bottom wall 115 is the same, so that the distance between the laser unit 20 on different steps 114 and the fluid channel 101 is the same, and the heat dissipation path length is the same, thereby achieving high consistency in heat dissipation of the laser unit 20, which can improve the reliability and consistency of the laser product.

[0039] In some embodiments, multiple steps 114 are distributed along a direction away from the liquid inlet 102, and the number of laser units 20 installed on the steps 114 farther away from the liquid inlet 102 is smaller. Specifically, multiple steps 114 are arranged along the length direction of the heat sink 110, and the height of the steps 114 gradually decreases along the length direction of the heat sink 110.

[0040] In some embodiments, the number of laser units 20 provided on each step 114 can be one or more. The more laser units 20 provided on a single step 114, the faster the required heat dissipation rate. The initial temperature of the heat dissipation medium at the liquid inlet 102 is the lowest, and the temperature difference is the largest when in contact with the heat source. Therefore, the heat dissipation rate of the laser heat sink 10 is the fastest near the liquid inlet 102, and the heat dissipation rate is slower further away from the liquid inlet 102. The step 114 closest to the liquid inlet 102 has the most laser units 20, which can effectively utilize the fast heat dissipation rate at the liquid inlet 102 and improve heat dissipation efficiency. At the same time, the number of laser units 20 installed on the steps 114 farther away from the liquid inlet 102 is smaller, which can adapt to the characteristic that the heat dissipation rate of the laser heat sink 10 gradually decreases in the direction away from the liquid inlet 102, so that the heat dissipation of the laser units 20 at different positions has high consistency.

[0041] In some embodiments, the second surface 117 of the heat sink 110 is provided with a second groove, and a step 114 is provided in the second groove. The depth of the second groove gradually increases in the direction from the first end 111 to the second end 112.

[0042] In some embodiments, the depth of the fluid channel 101 on the first surface 116 gradually decreases in the direction from the first end 111 to the second end 112. The fluid channel 101 has a greater depth near the inlet 102 and outlet 103, resulting in a larger capacity of the heat dissipation medium and the ability to remove more heat. The number of laser units 20 mounted on the step 114 gradually decreases in the direction from the first end 111 to the second end 112, corresponding to the decrease in the depth of the fluid channel 101.

[0043] In some embodiments, the fin 120 is connected to the bottom wall 115, and the height of the fin 120 gradually decreases in the direction from the first end 111 to the second end 112, so as to correspond to the decrease in the depth of the fluid channel 101.

[0044] In some embodiments, there are multiple fins 120, and the multiple fins 120 are arranged in parallel with each other. The spacing between two adjacent fins 120 is the same, so that the cross-sectional area of ​​each branch channel 104 is the same, thereby making the flow rate of the heat dissipation medium through each branch channel 104 the same, and making the heat dissipation of the laser unit 20 at the corresponding position of the second surface 117 balanced.

[0045] In some embodiments, the shape of the fin 120 corresponds to the shape of the fluid channel 101, and the shape of the fin 120 may be approximately "U" shaped.

[0046] In some embodiments, the fins 120 and the separators 113 may be made of the same material, and the materials of the fins 120 and the separators 113 may be metals or metal alloys with good thermal conductivity, such as copper or aluminum. In another embodiment, the materials of the fins 120 and the separators 113 may also be plastics, such as polymers like polyethylene or polypropylene.

[0047] In some embodiments, such as Figure 2 As shown, the fin 120 includes a flow divider section 121 disposed near the liquid inlet 102. There are multiple flow dividers 121, and the multiple flow dividers 121 are configured such that the flow divider section 121 that is closer to the liquid inlet 102 in the first direction X is closer to the liquid inlet 102 in the second direction Y. The first direction X is perpendicular to the plane where the flow divider section 121 is located, and the second direction Y is perpendicular to the plane where the liquid inlet 102 is located.

[0048] In some embodiments, the cross-sectional area of ​​the diversion region 105 gradually increases in the direction away from the inlet 102. The heat dissipation medium flowing into the fluid channel 101 from the inlet 102 can diffuse along the diversion region 105 to the various branch channels 104.

[0049] In some embodiments, the two sidewalls of the diversion region 105 in the first direction X are inclined so that the cross-sectional area of ​​the diversion region 105 gradually increases. The distribution of multiple diversion sections 121 in the second direction Y corresponds to the sidewalls of the diversion region 105 to form a uniform flow distribution, so that the flow rate of the heat dissipation medium in each branch channel 104 is approximately consistent, thereby improving heat dissipation efficiency and avoiding uneven heat dissipation.

[0050] In some embodiments, the fin 120 includes a first fin 122 and two second fins 123. The two second fins 123 are respectively disposed on both sides of the first fin 122. The flow-dividing section 121 of the first fin 122 is close to the center of the liquid inlet 102, and the flow-dividing sections 121 of the two second fins 123 are relatively far from the liquid inlet 102, thereby corresponding to the shape of the flow-dividing area 105 and forming a water-dividing and flow-equalizing system.

[0051] In some embodiments, the diversion section 121 of the first fin 122 is closer to the center of the inlet 102 in the first direction X than the diversion section 121 of the second fin 123, and the diversion section 121 of the first fin 122 is closer to the inlet 102 in the second direction Y than the diversion section 121 of the second fin 123. The line connecting one end of the diversion section 121 of the first fin 122 near the diversion region 105 and one end of the diversion section 121 of the second fin 123 near the diversion region 105 is inclined, and the inclined direction corresponds to the inclined direction of the sidewall of the diversion region 105.

[0052] In some embodiments, the fin 120 includes a confluence section 124 disposed near the liquid outlet 103. The number of confluence sections 124 is multiple, and the multiple confluence sections 124 are configured such that the confluence section 124 closer to the liquid outlet 103 in the first direction X is closer to the liquid outlet 103 in the second direction Y.

[0053] In some embodiments, the cross-sectional area of ​​the confluence region 106 gradually increases in the direction away from the outlet 103. The heat dissipation medium flowing from the various branch channels 104 to the outlet 103 can converge in the confluence region 106 and then flow to the outlet 103.

[0054] In some embodiments, the confluence section 124 of the first fin 122 is closer to the center of the liquid outlet 103, while the confluence section 124 of the second fins 123 on both sides is relatively far from the liquid outlet 103, thus corresponding to the shape of the confluence region 106.

[0055] In some embodiments, the inlet 102 is located in the middle of the projection surface of the inlet channel 1011 toward the third surface 118, and the outlet 103 is located in the middle of the projection surface of the outlet channel 1012 toward the third surface 118.

[0056] In some embodiments, such as Figure 1 As shown, the laser heat sink 10 also includes a sealing cover 130, which is sealed to the heat sink 110, and a fluid channel 101 is formed between the sealing cover 130 and the heat sink 110. The sealing cover 130 can be plate-shaped, and it is connected to the first surface 116 and forms a sealing structure with the first surface 116.

[0057] In some embodiments, the sealing structure formed by the sealing cap 130 and the first surface 116 may be formed by machining grooves around the fluid channel 101 and embedding a sealing ring, and then fixing the sealing cap 130 and the heat sink 110 with screws to form a sealing structure; or the mating structure of the sealing cap 130 and the heat sink 110 may be formed by brazing or other processes.

[0058] This application also provides a laser module, such as... Figure 4 As shown, the laser module includes the laser heat sink 10 of the above embodiment, and the laser module also includes a laser unit 20, which is mounted on the laser heat sink 10.

[0059] In some embodiments, the liquid inlet 102 and the liquid outlet 103 can be connected to the liquid guide pipe of an externally installed cooling device through a fixed quick connector to form a circulating cooling system, thereby effectively improving the heat dissipation efficiency of the high-power laser module during operation.

[0060] The laser heat sink 10 and laser module provided in this application have an inclined bottom wall 115 of the fluid channel 101, which is spaced at the same distance from the step surfaces of each step 114 to significantly reduce the heat dissipation distance. The water distribution and equal flow structure formed between the fins 120 and the heat sink 110 allows the heat dissipation medium to pass evenly through the heat dissipation surface of the laser heat sink 10, thereby reducing the reduction in heat dissipation efficiency caused by uneven water flow and dead water areas. The arc-shaped transition channel 1013 allows the heat dissipation medium to transition smoothly in the transition channel 1013, reducing the loss caused by impact turbulence. The laser heat sink has a simple structure and is coordinated with the distribution of the laser unit 20, which makes the heat dissipation of the laser module highly consistent, which is conducive to improving heat dissipation efficiency and reducing production costs.

[0061] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A laser heat sink, characterized in that, include: A heat sink is provided with a fluid channel. A laser unit is installed on the side of the heat sink away from the fluid channel. The heat sink is also provided with a liquid inlet and a liquid outlet. The fluid channel connects the liquid inlet and the liquid outlet. A diversion area is provided at the end of the fluid channel near the liquid inlet. Fins are installed in the fluid channel, and the fins divide at least a portion of the fluid channel into multiple branch channels. The inlet end of the branch channel is connected to the inlet through the diversion area.

2. The laser heat sink according to claim 1, characterized in that, The heat sink includes a first end and a second end away from the first end. The liquid inlet and the liquid outlet are located at the first end. A separator is connected to the first end. The fluid channel includes an inlet channel, an outlet channel, and a transition channel. The separator is located between the inlet channel and the outlet channel. The inlet channel is connected to the inlet. The outlet channel is connected to the outlet. The transition channel is located at the second end and connects the inlet channel and the outlet channel.

3. The laser heat sink according to claim 2, characterized in that, The fluid channel has a confluence area at one end near the outlet, and the outlet end of the branch channel is connected to the outlet through the confluence area.

4. The laser heat sink according to claim 1, characterized in that, The fin includes a flow divider section disposed near the liquid inlet. The number of flow dividers is multiple. The multiple flow dividers are configured such that the flow divider section closer to the liquid inlet in a first direction is closer to the liquid inlet in a second direction. The first direction is perpendicular to the plane where the flow divider section is located, and the second direction is perpendicular to the plane where the liquid inlet is located.

5. The laser heat sink according to claim 4, characterized in that, The fin includes a first fin and two second fins, which are respectively disposed on both sides of the first fin. The flow-diverting section of the first fin is closer to the center of the liquid inlet in the first direction than the flow-diverting section of the second fin, and the flow-diverting section of the first fin is closer to the liquid inlet in the second direction than the flow-diverting section of the second fin.

6. The laser heat sink according to claim 1, characterized in that, The cross-sectional area of ​​the diversion region gradually increases in the direction away from the inlet.

7. The laser heat sink according to claim 1, characterized in that, The heat sink has multiple steps on the side away from the fluid channel. The multiple steps are distributed in a stepped, inclined manner. The steps are used to install the laser unit. The fluid channel is inclined near the bottom wall of the steps. The inclined direction of the bottom wall corresponds to the inclined direction of the multiple steps.

8. The laser heat sink according to claim 7, characterized in that, The multiple steps are distributed in a direction away from the liquid inlet, and the number of laser units installed on the steps farther away from the liquid inlet is less.

9. The laser heat sink according to claim 1, characterized in that, The laser heat sink also includes a sealing cover, which is sealed to the heat sink, and the fluid channel is formed between the sealing cover and the heat sink.

10. A laser module, characterized in that, The laser module includes the laser heat sink according to any one of claims 1-9, and the laser module further includes a laser unit, which is mounted on the laser heat sink.

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