Micro-channel water-cooling crystal clamp structure for laser crystal

Abstract

The invention discloses a micro-channel water-cooling crystal clamp structure for a laser crystal, which comprises a base, the top of which is provided with a crystal fixing groove for fixing the laser crystal; the upper cover is mounted at the top of the base; the flow-flowing structure comprises a flow-flowing cavity and a sealing piece, a plurality of flow-guiding ribs which are arranged in parallel are arranged in the flow-flowing cavity, and gaps among the flow-guiding ribs form flow-guiding channels; an acute included angle is formed between the forming direction of the crystal fixing groove and the flowing direction of the cooling liquid. The upper surface and the lower surface of the laser crystal are simultaneously cooled and subjected to heat exchange by utilizing the flowing structures of the base and the upper cover, so that the water-cooling heat dissipation effect is enhanced; the flow guide ribs can slow down the flowing speed of the cooling liquid while guiding the cooling liquid to flow, so that the heat exchange time of the cooling liquid and the laser crystal is prolonged; the acute included angle is formed between the forming direction of the crystal fixing grooves and the flowing direction of the cooling liquid, so that the laser crystal is subjected to staggered segmented cooling through the flow guide channels, and the overall cooling effect of the laser crystal is improved.

Description

Technical Field

[0001] The invention relates to the field of ultrafast laser technology, and in particular to a microchannel water-cooled crystal clamp structure for laser crystals. Background Art

[0002] Ultrafast lasers are usually generated using structures such as titanium-doped sapphire and neodymium glass as gain media to achieve the generation of femtosecond and picosecond lasers. In the process of laser energy amplification, as the pump energy and laser energy increase, the effect of thermal lens in the crystal becomes increasingly obvious. Thermal lens will destroy the spot pattern, and the strong point of the spot transmission process is one of the important reasons for the damage of optical components in the optical path. Therefore, how to take away the excess heat is the key to solving the thermal lens effect.

[0003] The traditional solution is to reduce the temperature to below zero by cooling the semiconductor, which requires making a crystal chamber and using a vacuum pump to ensure a high vacuum state inside the crystal chamber, which leads to problems such as increased costs and complex structures. If water cooling is used for heat exchange, its heat dissipation efficiency is difficult to reach the level of semiconductor cooling, resulting in poor heat dissipation, and the laser crystal still has the risk of thermal lens effect. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a microchannel water-cooled crystal clamp structure for laser crystals, which has a simple structure to reduce production costs, and improves the heat dissipation efficiency of the laser crystal based on the water cooling principle, thereby extending the service life of the laser crystal.

[0005] A microchannel water-cooled crystal clamp structure for a laser crystal according to an embodiment of the present invention comprises:

[0006] A base, the top of which is provided with a crystal fixing groove for fixing the laser crystal, and both ends of the crystal fixing groove respectively penetrate to the side surfaces of the base;

[0007] An upper cover, which is mounted on the top of the base and is used to fix the laser crystal in the crystal fixing groove;

[0008] A transfusion structure, comprising a transfusion cavity and a sealing member, wherein the transfusion cavity is opened at the bottom of the base and the top of the upper cover, a plurality of flow guiding ribs arranged in parallel are arranged in the transfusion cavity, the sealing member covers the transfusion cavity and forms a flow guiding channel through the gaps between the flow guiding ribs, a water inlet is opened at one end of the transfusion cavity and a water outlet is opened at the other end, and the water inlet and the water outlet are both connected to the flow guiding channels;

[0009] The coolant can flow into the guide channel from the water inlet and be discharged from the water outlet, and the opening direction of the crystal fixing groove forms an acute angle with the flow direction of the coolant.

[0010] The microchannel water-cooled crystal clamp structure for laser crystals according to the embodiments of the present invention has at least the following beneficial effects: utilizing the transverse flow structure of the base and the upper cover to cool and exchange heat on the upper and lower surfaces of the laser crystal at the same time, thereby enhancing the water cooling and heat dissipation effect; the guide ribs can guide the flow of the coolant while slowing down the flow rate of the coolant, thereby extending the heat exchange time with the laser crystal; the opening direction of the crystal fixing groove forms an acute angle with the flow direction of the coolant, so that each guide channel performs staggered segmented cooling on the laser crystal, thereby improving the overall cooling effect of the laser crystal.

[0011] According to some embodiments of the present invention, the end surface of the guide rib is a curved surface.

[0012] According to some embodiments of the present invention, the inner diameter of the end of the transfusion cavity gradually increases toward the middle of the transfusion cavity.

[0013] According to some embodiments of the present invention, the end surface of the transverse flow cavity is a curved surface.

[0014] According to some embodiments of the present invention, the transfusion cavity provided on the base is a first transfusion cavity, the transfusion cavity provided on the upper cover is a second transfusion cavity, and the flow direction of the coolant in the first transfusion cavity is the same as the flow direction of the coolant in the second transfusion cavity.

[0015] According to some embodiments of the present invention, the transfusion cavity provided on the base is a first transfusion cavity, and the transfusion cavity provided on the upper cover is a second transfusion cavity, and the flow direction of the coolant in the first transfusion cavity is opposite to the flow direction of the coolant in the second transfusion cavity.

[0016] According to some embodiments of the present invention, an indium foil layer is further provided on the inner wall of the crystal fixing groove, and the indium foil layer is provided between the crystal fixing groove and the laser crystal.

[0017] According to some embodiments of the present invention, the crystal fixing groove includes a fixing portion, an incident portion and an exit portion, the incident portion and the exit portion each include a small diameter end with a smaller width and a small diameter end and a large diameter end with a larger width, the small diameter end of the incident portion and the small diameter end of the exit portion are respectively connected to two ends of the fixing portion, and the large diameter end of the incident portion and the large diameter end of the exit portion both extend to the side of the base.

[0018] According to some embodiments of the present invention, the microchannel water-cooled crystal clamp structure for laser crystals also includes a switching mechanism, which includes a switching member and a fixed seat, the base is connected to the switching member, and the switching member is rotatably connected to the fixed seat.

[0019] According to some embodiments of the present invention, an arc-shaped waist-shaped hole is provided on the adapter, and the center of the arc-shaped waist-shaped hole is located on the rotation axis of the adapter; the fixing seat is provided with a mounting hole, and a bolt is passed through the arc-shaped waist-shaped hole and threadedly connected to the mounting hole, so as to fix the relative angle between the adapter and the fixing seat.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 This is a disassembled diagram of a microchannel water-cooled crystal clamp structure for a laser crystal according to an embodiment of the present invention;

[0023] Figure 2 It is a bottom view of the base 100 in the microchannel water-cooled crystal clamp structure for laser crystals according to an embodiment of the present invention;

[0024] Figure 3 A three-dimensional diagram of a base 100 in a microchannel water-cooled crystal clamp structure for laser crystals according to an embodiment of the present invention;

[0025] Figure 4 It is a top view of the upper cover 200 in the microchannel water-cooled crystal clamp structure for laser crystal according to an embodiment of the present invention.

[0026] Figure markings: 100-base, 110-crystal fixing groove, 111-fixing part, 112-incident part, 113-exit part, 200-upper cover, 300-transient flow structure, 310-transient flow cavity, 311-guide ribs, 312-water inlet, 313-water outlet, 320-seal, 400-adapter mechanism, 410-adapter, 411-arc-shaped waist hole, 420-fixing seat, 421-mounting hole, 422-scale, 500-coolant connector, 600-laser crystal. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0032] The traditional laser crystal cooling solution is to reduce the temperature to below zero by semiconductor cooling, which requires the production of a crystal chamber and the use of a vacuum pump to ensure a high vacuum state inside the crystal chamber, which leads to problems such as increased costs and complex structures. If water cooling is used for heat exchange, its heat dissipation efficiency is difficult to reach the level of semiconductor cooling, resulting in poor heat dissipation, and the laser crystal is still at risk of thermal lens effect.

[0033] In this regard, the present application proposes a microchannel water-cooled crystal clamp structure for laser crystals, which utilizes the transverse flow structure 300 of the base 100 and the upper cover 200 to simultaneously cool and exchange heat on the upper and lower surfaces of the laser crystal 600, thereby enhancing the water-cooling heat dissipation effect; the guide ribs 311 can guide the flow of the coolant while slowing down the flow rate of the coolant, thereby extending the heat exchange time with the laser crystal 600; the opening direction of the crystal fixing groove 110 is at an acute angle to the flow direction of the coolant, so that each guide channel performs staggered segmented cooling on the laser crystal 600, thereby improving the overall cooling effect of the laser crystal 600.

[0034] Reference Figure 1 A microchannel water-cooled crystal clamp structure for laser crystals in an embodiment of the present application includes a base 100, an upper cover 200, and a transfusion structure 300. The base 100 and the upper cover 200 are used to clamp and fix the laser crystal 600. The transfusion structure 300 is arranged on the base 100 and the upper cover 200, which can guide the coolant to flow through the base 100 and the upper cover 200, and transfer the cold of the coolant to the laser crystal 600, thereby completing the cooling of the laser crystal 600.

[0035] Specifically, a crystal fixing groove 110 for fixing the laser crystal 600 is provided on the top of the base 100, and both ends of the crystal fixing groove 110 respectively penetrate to the side of the base 100. After the laser crystal 600 is fixed in the crystal fixing groove 110, the laser can be injected into the laser crystal 600 from one side of the base 100 and emitted from the other side of the base 100, and the laser crystal 600 is used to complete the gain of the laser.

[0036] The upper cover 200 is installed on the top of the base 100 and can be fixed to the base 100 in a detachable manner such as bolt connection, snap connection or pin connection, and is used to fix the laser crystal 600 in the crystal fixing groove 110 to prevent the laser crystal 600 from loosening from the crystal fixing groove 110.

[0037] The flow structure 300 includes a flow cavity 310 and a sealing member 320. The flow cavity 310 is opened at the bottom of the base 100 and the top of the upper cover 200. Figure 2 and Figure 4, a plurality of guide ribs 311 arranged in parallel are arranged in the flow cavity 310. The seal 320 covers the flow cavity 310 and forms a guide channel in the gap between each guide rib 311. Each guide channel is arranged in parallel to guide the coolant to flow evenly through the flow cavity 310, making full use of the cooling capacity of the coolant. A water inlet 312 is provided at one end of the flow cavity 310 and a water outlet 313 is provided at the other end, and the water inlet 312 and the water outlet 313 are both connected to each guide channel. The sides of the base 100 and the upper cover 200 are both provided with holes connected to the water inlet 312 or the water outlet 313, and a coolant connector 500 is installed outside the hole to connect to an external coolant supply device. Thus, the coolant can flow into the guide channel from the water inlet 312 and be discharged from the water outlet 313.

[0038] It is worth noting that the opening direction of the crystal fixing groove 110 forms an acute angle with the flow direction of the coolant, so that each guide channel cools the corresponding sections of the laser crystal 600 in a staggered manner, making it difficult for the thermal effect of the laser crystal 600 to accumulate, thereby accelerating the cooling effect.

[0039] Furthermore, the end face of the guide rib 311 is an arc surface, so that when the coolant enters the flow cavity 310 and contacts the end of the guide rib 311, it can be smoothly guided by the guide rib 311 to the guide channels on both sides, reducing the impact of the coolant on the guide rib 311.

[0040] Furthermore, the inner diameter of the end of the turbulence chamber 310 gradually increases toward the middle of the turbulence chamber 310. On the one hand, when the coolant enters from the water inlet 312, it can be guided by the gradually expanding diameter of the turbulence chamber 310 and quickly spread into the turbulence chamber 310. On the other hand, when the coolant is ready to flow out from the water outlet 313, it is guided by the gradually narrowing diameter of the turbulence chamber 310 and quickly gathers at the water outlet 313, thereby accelerating the inflow and outflow of the coolant.

[0041] Specifically, the end surface of the turbulence cavity 310 is an arc surface, which can smoothly guide the coolant to flow into or out of the turbulence cavity 310. It is easy to understand that the end of the turbulence cavity 310 can also be designed as a trumpet-shaped structure.

[0042] The transfusion cavity 310 disposed on the base 100 is a first transfusion cavity, and the transfusion cavity 310 disposed on the upper cover 200 is a second transfusion cavity. In some embodiments, the flow direction of the coolant in the first transfusion cavity is the same as the flow direction of the coolant in the second transfusion cavity. Alternatively, in other embodiments, the flow direction of the coolant in the first transfusion cavity is opposite to the flow direction of the coolant in the second transfusion cavity, so that the cooling range is more evenly distributed and the cooling efficiency is improved.

[0043] Furthermore, an indium foil layer is also provided on the inner wall of the crystal fixing groove 110, and the indium foil layer is provided between the crystal fixing groove 110 and the laser crystal 600. The indium foil layer can be melted by heating at about 165°, so that the laser crystal 600 is tightly fixed in the crystal fixing groove 110, increasing the heat conduction area when the laser crystal 600 is heated, and at the same time achieving a better cooling effect.

[0044] Further, refer to Figure 3 The crystal fixing groove 110 includes a fixing portion 111, an incident portion 112, and an exit portion 113. The incident portion 112 and the exit portion 113 each include a small diameter end with a smaller width and a large diameter end with a larger width. The small diameter end of the incident portion 112 and the small diameter end of the exit portion 113 are respectively connected to the two ends of the fixing portion 111, and the large diameter end of the incident portion 112 and the large diameter end of the exit portion 113 are both extended to the side of the base 100, so that the light has a greater transmittance when entering the laser crystal 600.

[0045] It is worth noting that the fixing portion 111 obliquely intersects the incident portion 112 and the exit portion 113, and the angle of intersection is the Brewster angle. Because when light enters the laser crystal 600, if a greater transmittance is required, an angle is required. Compared with normal incidence, the design angle is the Brewster angle, which can maximize the transmittance of light when it enters obliquely and ensure that the light is parallel in the incident and exit directions. For example, the Brewster angle of titanium sapphire is about 60.4 degrees. The specific angle value of the Brewster angle is not limited here.

[0046] Furthermore, the microchannel water-cooled crystal clamp structure for laser crystals also includes an adapter mechanism 400, which includes an adapter 410 and a fixed seat 420. The base 100 is connected to the adapter 410, and the adapter 410 is rotatably connected to the fixed seat 420. Thus, by rotating the adapter 410, the angle of the base 100 can be adjusted to adapt to the incident angle of the laser. Specifically, a scale 422 is also provided on the fixed seat 420, and the scale 422 can be used to understand the current orientation angle of the adapter 410, and then make fine adjustments.

[0047] Furthermore, the adapter 410 is provided with an arc-shaped waist-shaped hole 411, and the center of the arc-shaped waist-shaped hole 411 is located on the rotation axis of the adapter 410. The fixing seat 420 is provided with a mounting hole 421, and a bolt is passed through the arc-shaped waist-shaped hole 411 and is threadedly connected to the mounting hole 421, so that the relative angle between the adapter 410 and the fixing seat 420 can be fixed.

[0048] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A microchannel water-cooled crystal clamp structure for laser crystals, characterized in that: include: A base, the top of which is provided with a crystal fixing groove for fixing the laser crystal, and both ends of the crystal fixing groove respectively penetrate to the side surfaces of the base; An upper cover, which is mounted on the top of the base and is used to fix the laser crystal in the crystal fixing groove; A transfusion structure, comprising a transfusion cavity and a sealing member, wherein the transfusion cavity is opened at the bottom of the base and the top of the upper cover, a plurality of flow guiding ribs arranged in parallel are arranged in the transfusion cavity, the sealing member covers the transfusion cavity and forms a flow guiding channel through the gaps between the flow guiding ribs, a water inlet is opened at one end of the transfusion cavity and a water outlet is opened at the other end, and the water inlet and the water outlet are both connected to the flow guiding channels; The coolant can flow into the guide channel from the water inlet and be discharged from the water outlet, and the opening direction of the crystal fixing groove forms an acute angle with the flow direction of the coolant.

2. The microchannel water-cooled crystal clamp structure for laser crystal according to claim 1, characterized in that: The end surface of the guide rib is a curved surface.

3. The microchannel water-cooled crystal clamp structure for laser crystal according to claim 1, characterized in that: The inner diameter of the end of the transverse flow cavity gradually increases toward the middle of the transverse flow cavity.

4. The microchannel water-cooled crystal clamp structure for laser crystal according to claim 3, characterized in that: The end surface of the transverse flow cavity is a curved surface.

5. The microchannel water-cooled crystal clamp structure for laser crystal according to claim 1, characterized in that: The transfusion cavity arranged on the base is a first transfusion cavity, and the transfusion cavity arranged on the upper cover is a second transfusion cavity. The flow direction of the coolant in the first transfusion cavity is the same as the flow direction of the coolant in the second transfusion cavity.

6. The microchannel water-cooled crystal clamp structure for laser crystal according to claim 1, characterized in that: The transfusion cavity arranged on the base is a first transfusion cavity, and the transfusion cavity arranged on the upper cover is a second transfusion cavity. The flow direction of the coolant in the first transfusion cavity is opposite to the flow direction of the coolant in the second transfusion cavity.

7. The microchannel water-cooled crystal clamp structure for laser crystal according to claim 1, characterized in that: An indium foil layer is also provided on the inner wall of the crystal fixing groove, and the indium foil layer is provided between the crystal fixing groove and the laser crystal.

8. The microchannel water-cooled crystal clamp structure for laser crystal according to claim 1, characterized in that: The crystal fixing groove includes a fixing part, an incident part and an exit part, and the incident part and the exit part each include a small diameter end with a smaller width and a large diameter end with a larger width, the small diameter end of the incident part and the small diameter end of the exit part are respectively connected to the two ends of the fixing part, and the large diameter end of the incident part and the large diameter end of the exit part both extend to the side of the base.

9. The microchannel water-cooled crystal clamp structure for laser crystal according to any one of claims 1 to 8, characterized in that: The microchannel water-cooled crystal clamp structure for laser crystals also includes a switching mechanism, which includes a switching member and a fixing seat. The base is connected to the switching member, and the switching member is rotatably connected to the fixing seat.

10. The microchannel water-cooled crystal clamp structure for laser crystal according to claim 9, characterized in that: The adapter is provided with an arc-shaped waist-shaped hole, the center of which is located on the rotating axis of the adapter; the fixing seat is provided with a mounting hole, and a bolt is passed through the arc-shaped waist-shaped hole and threadedly connected to the mounting hole to fix the relative angle between the adapter and the fixing seat.

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