Laser crystal fixing structure and solid laser

Abstract

The utility model relates to a laser crystal fixing structure which comprises a crystal seat, the crystal seat is provided with a through hole, a liquid inlet hole and a liquid outlet hole, the side walls of the two ends of the through hole are provided with installation parts extending towards the axis direction of the through hole, and the liquid inlet hole and the liquid outlet hole are respectively communicated with the through hole to form a cooling liquid circulation channel. The utility model also relates to a solid laser, the laser crystal fixing structure and the solid laser provided by the utility model fix the laser crystal through the mounting parts at the two ends, so that a gap is formed between the laser crystal and the through hole, the laser crystal can be soaked in the cooling liquid in the cooling process, and the cooling efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of solid-state laser technology, and in particular to a laser crystal fixing structure and a solid-state laser. Background Technology

[0002] With the development of laser technology, higher output power is a clear development goal. Compared with other pumping methods, end-pumping has a significant advantage in terms of higher beam quality. However, the disadvantages of end-pumping are also obvious: the more concentrated pump light brings a more pronounced thermal effect. Therefore, heat dissipation is an issue that cannot be ignored for end-pumping.

[0003] Among the existing heat dissipation methods, there are those that directly conduct heat through the crystal holder, and those that create cooling water channels in the crystal holder for water cooling. However, the direct conduction method is only suitable for low pump energy, while the water cooling method is limited by the size of the crystal holder, resulting in small water channel diameters and poor cooling effect. Utility Model Content

[0004] In view of this, the present invention provides a laser crystal fixing structure and a solid-state laser to solve the heat dissipation problem of the laser crystal during end-face pumping.

[0005] To achieve the above objectives, the technical solution of this utility model is to provide a laser crystal fixing structure, including: a crystal seat, the crystal seat having a through hole, a liquid inlet hole and a liquid outlet hole, the two end sidewalls of the through hole having mounting portions extending in the direction of its axis, the liquid inlet hole and the liquid outlet hole respectively communicating with the through hole to form a coolant circulation channel.

[0006] Preferably, the through hole is a circular hole, the mounting part is annular, and the diameter of the through hole is 0.5 mm larger than the diameter of the mounting part.

[0007] Preferably, the crystal holder includes a crystal cover and a base, the crystal cover being connected to the base, and the connection forming the through hole.

[0008] Preferably, the connecting surface between the crystal cover and the base coincides with the axis of the through hole.

[0009] Preferably, both the liquid inlet and the liquid outlet are located on the base.

[0010] Preferably, the crystal cover is provided with a through hole, and the base is provided with a threaded hole, the through hole and the threaded hole being concentric.

[0011] Preferably, the connection surface between the crystal cover and the base is indium soldered.

[0012] Preferably, the mounting part is provided with a first sealing ring groove, and a first sealing ring is disposed in the first sealing ring groove; both the liquid inlet and the liquid outlet are provided with a second sealing ring groove, and a second sealing ring is disposed in the second sealing ring groove.

[0013] Preferably, the axes of the liquid inlet and the liquid outlet are parallel to each other, and both form an angle with the axis of the through hole, and the angle is 90°.

[0014] This invention also provides a solid-state laser, including a fixed structure, a laser crystal, and a pump source. The fixed structure is used to fix the laser crystal, and the pump source is used to inject pump light into the laser crystal to generate laser light.

[0015] Compared with the prior art, the laser crystal fixing structure and solid-state laser machine provided by this utility model have the following beneficial effects:

[0016] 1. The laser crystal is fixed by the mounting parts at both ends of the through hole, so that a gap is formed between the laser crystal and the through hole, so that the laser crystal can be immersed in the coolant during the cooling process, thereby improving the cooling efficiency and avoiding heat accumulation caused by insufficient heat dissipation capacity;

[0017] 2. The coolant temperature can be set according to different pump surge power to ensure a low thermal effect;

[0018] 3. The gap between the laser crystal and the through hole means that the laser crystal does not have a rigid connection compared to the structure, thus it is not subject to compressive stress when thermal expansion occurs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a laser crystal fixing structure provided in the first embodiment of the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure;

[0021] Figure 3 for Figure 1 A schematic diagram of the exploded structure;

[0022] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0023] Figure 5 for Figure 1 Schematic diagram showing the location and structure of the liquid inlet and outlet holes;

[0024] Explanation of reference numerals in the attached figures:

[0025] 10. Crystal base; 11. Through hole; 12. Liquid inlet; 13. Liquid outlet; 14. Second sealing ring groove; 15. Second sealing ring; 101. Crystal cover; 102. Base; 111. Mounting part; 112. First sealing ring groove; 113. First sealing ring; N. Laser crystal. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] Please see Figure 1-3 The first embodiment of this utility model provides a laser crystal fixing structure, including a crystal seat 10. The crystal seat 10 has a through hole 11, a liquid inlet hole 12 and a liquid outlet hole 13. The two end side walls of the through hole 11 have mounting portions 111 extending in the direction of its axis. The liquid inlet hole 12 and the liquid outlet hole 13 are respectively connected to the through hole 11 to form a coolant circulation channel.

[0028] Specifically, the shapes of the mounting portions 111 at both ends of the through hole 11 are adapted to the shape of the laser crystal N, used to fix the laser crystal N inside the through hole 11, and the laser crystal N and the mounting portions 111 are sealed together, so that a gap is formed between the side wall of the through hole 11 and the laser crystal N. At this time, the mounting portions 111 at both ends and the inner wall of the through hole 11 form a coolant accumulation chamber, and the inlet hole 12 and the outlet hole 13 are respectively connected to the accumulation chamber. When the coolant enters the through hole 11 from the inlet hole 12, it accumulates in the accumulation chamber, and after the accumulation chamber is filled to a certain extent, it flows out from the outlet hole 13, forming a coolant circulation channel. In this way, during the coolant circulation process, the laser crystal N is immersed in the coolant in the accumulation chamber. Even if the inlet hole 12 and the outlet hole 13 are limited by the volume of the crystal seat 10, resulting in a small aperture, the heat dissipation of the laser crystal N can still be achieved well.

[0029] It is understood that the inlet hole 12 can be connected to the coolant supply device to supply coolant to the coolant circulation channel.

[0030] Furthermore, the axes of the liquid inlet hole 12 and the liquid outlet hole 13 are both at an angle to the axis of the through hole 11.

[0031] Furthermore, the axes of the liquid inlet hole 12 and the liquid outlet hole 13 are parallel to each other, and the angle between them and the axis of the through hole 11 is 90°.

[0032] In this embodiment, the through hole 11 is a circular hole, the mounting part 111 is annular, and the diameter of the through hole 11 is 0.5 mm larger than the diameter of the mounting part 111.

[0033] It is understood that the through hole 11 and the mounting part 111 can also be any other shape, as long as the mounting part 111 is adapted to the shape of the laser crystal and a gap is formed between the laser crystal and the through hole 11 after the laser crystal is fixed.

[0034] Please see Figure 3 The crystal holder 10 includes a crystal cover 101 and a base 102. The crystal cover 101 is connected to the base 102, and the connection forms a through hole 11.

[0035] Specifically, the crystal cover 101 and the base 102 are interlocked, and both the crystal cover 101 and the base 102 have grooves on their opposite sides. After the crystal cover 101 and the base 102 are interlocked, the grooves on the crystal cover 101 and the base 102 are combined to form a through hole 11.

[0036] It is understandable that the laser crystal N can be clamped or released through the crystal cover 101 and the base 102, which facilitates the replacement of the laser crystal N.

[0037] Furthermore, the connecting surface between the crystal cover 101 and the base 102 coincides with the axis of the through hole 11.

[0038] It is understandable that when the connecting surface of the crystal cover 101 and the base 102 coincides with the axis of the through hole 11, the grooves on the opposite surfaces of the crystal cover 101 and the base 102 each occupy half of the through hole 11.

[0039] It is understood that the mounting part 111 may be provided only on one side of the crystal cover 101 or the base 102, or it may be provided on both sides of the crystal cover 101 and the base 102. That is, the mounting part 111 extending towards the axis of the through hole 11 may be provided only on one side of the crystal cover 101 or the base 102, or the mounting part 111 extending towards the axis of the through hole 11 may be provided on both sides of the crystal cover 101 and the base 102.

[0040] When the mounting part 111 is located on one side of the crystal cover 101 or the base 102, the liquid inlet 12 and the liquid outlet 13 are both located on the corresponding side to achieve communication with the through hole 11. In this case, during cooling, only half of the laser crystal is immersed in the coolant. When the mounting part 111 is located on both sides of the crystal cover 101 and the base 102, the liquid inlet 12 and the liquid outlet 13 can be located on the crystal cover 101 or the base 102, as long as they can communicate with the through hole 11. In this case, during cooling, the laser crystal is completely immersed in the coolant.

[0041] Preferably, mounting portions 111 are provided on both sides of the crystal cap 101 and the base 102, and the liquid inlet 12 and the liquid outlet 13 are both located on the base 102.

[0042] Furthermore, the crystal cover 101 is provided with a through hole, and the base 102 is provided with a threaded hole. The through hole and the threaded hole are concentric. A screw passes through the through hole and engages with the threaded hole to achieve the connection between the crystal cover 101 and the base 102.

[0043] In this embodiment, after the crystal cover 101 is connected to the base 102, indium solder is performed between the contact surfaces of the crystal cover 101 and the base 102 to ensure the sealing of the through hole 11.

[0044] Please see Figure 3-4 The mounting part 111 has a first sealing ring groove 112, and a first sealing ring 113 is provided in the first sealing ring groove 112.

[0045] Specifically, each of the mounting portions 111 at both ends is provided with a first sealing ring groove 112. The first sealing ring 113 is fitted onto the laser crystal N and located within the first sealing ring groove 112, so as to increase the sealing performance of both ends of the through hole 11 when fixing the laser crystal N and prevent coolant from flowing out from the mounting portions 111 at both ends.

[0046] Please see Figure 5 Both the liquid inlet 12 and the liquid outlet 13 are provided with a second sealing ring groove 14, and a second sealing ring 15 is provided in the second sealing ring groove 14.

[0047] Specifically, by setting a second sealing ring 15, the sealing performance of the inlet hole 12 and the outlet hole 13 is increased to prevent coolant leakage.

[0048] It is understandable that both the first sealing ring 113 and the second sealing ring 15 are made of high-temperature fluororubber to avoid aging of the sealing ring when the indium soldering temperature is greater than 140°C.

[0049] It is understandable that the diameters of the inlet hole 12 and the outlet hole 13 can be set according to requirements, as long as the laser crystal N can be immersed in the coolant during the coolant circulation process.

[0050] The working principle of the laser crystal fixing structure provided by this utility model is as follows: During end-face pumping, the laser crystal N is fixed by the mounting parts 111 at both ends of the through hole 11. The liquid inlet hole 12 is connected to an external coolant supply device, and coolant is input into the through hole 11. There is a gap between the laser crystal N and the through hole 11, that is, the laser crystal N is suspended relative to the inner wall of the through hole 11. As the coolant continues to enter, the gap between the through hole 11 and the laser crystal N is filled, so that the laser crystal N is immersed in the coolant, thereby cooling the laser crystal N. After the gap is filled, the filled coolant is discharged from the liquid outlet hole 13, completing the circulation of the coolant.

[0051] The second embodiment of this utility model provides a solid-state laser, including a laser crystal fixing structure, a laser crystal, and a pump source. The laser crystal fixing structure is used to fix the laser crystal, and the pump source is used to inject pump light into the laser crystal to generate laser light.

[0052] Compared with existing technologies, the laser crystal fixing structure and solid-state laser provided by this invention fix the laser crystal through mounting parts at both ends of the through hole, creating a gap between the laser crystal and the through hole. This allows the laser crystal to be immersed in coolant during cooling, improving cooling efficiency and avoiding heat accumulation due to insufficient heat dissipation. Furthermore, the coolant temperature can be set according to different pump surge power, ensuring a lower thermal effect. Simultaneously, due to the gap between the laser crystal and the through hole, the laser crystal does not have a rigid connection compared to the structure, thus avoiding compressive stress during thermal expansion.

[0053] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A laser crystal fixing structure, characterized in that, include: A crystal holder has a through hole, a liquid inlet hole, and a liquid outlet hole. The two end sidewalls of the through hole have mounting portions extending in the direction of its axis. The liquid inlet hole and the liquid outlet hole are respectively connected to the through hole to form a coolant circulation channel.

2. The laser crystal fixing structure as described in claim 1, characterized in that: The through hole is a circular hole, the mounting part is annular, and the diameter of the through hole is 0.5 mm larger than the diameter of the mounting part.

3. The laser crystal fixing structure as described in claim 1, characterized in that: The crystal holder includes a crystal cover and a base, the crystal cover being connected to the base, and the connection forming the through hole.

4. The laser crystal fixing structure as described in claim 3, characterized in that: The connection surface between the crystal cover and the base coincides with the axis of the through hole.

5. The laser crystal fixing structure as described in claim 3, characterized in that: Both the liquid inlet and the liquid outlet are located on the base.

6. The laser crystal fixing structure as described in claim 3, characterized in that: The crystal cover has a through hole, and the base has a threaded hole, with the through hole and the threaded hole being concentric.

7. The laser crystal fixing structure as described in claim 3, characterized in that: The crystal cover is indium soldered to the connection surface of the base.

8. The laser crystal fixing structure as described in claim 1, characterized in that: The mounting part is provided with a first sealing ring groove, and a first sealing ring is provided in the first sealing ring groove; both the liquid inlet and the liquid outlet are provided with a second sealing ring groove, and a second sealing ring is provided in the second sealing ring groove.

9. The laser crystal fixing structure as described in claim 1, characterized in that: The axes of the liquid inlet and the liquid outlet are parallel to each other, and both form an angle with the axis of the through hole.

10. A solid-state laser, characterized in that, The device includes a fixed structure, a laser crystal, and a pump source as described in any one of claims 1-9, wherein the fixed structure is used to fix the laser crystal, and the pump source is used to inject pump light into the laser crystal to generate laser light.

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