Compact high-energy laser crystal liquid cooling device and terahertz time-domain spectrometer

Abstract

The embodiment of the invention provides a compact high-energy laser crystal liquid cooling device and a terahertz time-domain spectrometer, and relates to the technical field of laser, and the compact high-energy laser crystal liquid cooling device comprises a rotating structure which comprises a connecting part and a rotating part which are connected with each other, the periphery of the rotating part is cylindrical, and the rotating part is provided with a crystal groove; the liquid cooling structure is provided with a cooling hole matched with the periphery of the rotating part, the rotating part is rotationally connected with the cooling hole, and the cooling hole is used for cooling the rotating part; and the crystal cover is connected with the connecting part, a crystal cavity is defined by the crystal cover and the crystal groove, and the crystal cavity is used for placing a crystal. In the embodiment of the invention, the angle between the polarization direction of the laser and the crystal orientation of the crystal can be randomly adjusted by driving the rotating part to rotate, so that the convenience of angle adjustment is improved; and the overall space is effectively reduced, so that the structure of the whole device is more compact. Compared with an air cooling heat dissipation scheme, the heat dissipation efficiency of the embodiment is high, and the stability of an optical path is not affected.

Description

Technical Field

[0001] The present application relates to the technical field of terahertz sources, and in particular to a compact high-energy laser crystal liquid cooling device and a terahertz time-domain spectrometer. Background Art

[0002] In related technologies, lasers are generated by pumping light to excite laser gain media - laser crystals; terahertz radiation is generated by femtosecond lasers to excite nonlinear optical crystals. With the continuous development and progress of technology, people have higher and higher requirements for laser light sources and terahertz radiation sources, hoping to obtain higher intensity laser light sources and strong terahertz radiation sources. Increasing the power density of the excitation light is an effective method, but it also puts higher requirements on the heat dissipation performance of the crystal, so the research and development of high-energy laser crystal liquid cooling devices is very important. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a compact high-energy laser crystal liquid cooling device and a terahertz time-domain spectrometer, which is convenient for adjusting the crystal angle and can effectively improve the effect of heat dissipation of the crystal.

[0004] An embodiment of one aspect of the present application provides a compact high-energy laser crystal liquid cooling device, comprising:

[0005] The rotating structure comprises a connecting part and a rotating part connected to each other, wherein the outer periphery of the rotating part is cylindrical and the rotating part is provided with a crystal groove;

[0006] A liquid cooling structure, having a cooling hole matching the outer periphery of the rotating part, the rotating part being rotatably connected to the cooling hole, and the cooling hole being used to cool the rotating part;

[0007] A crystal cover connected to the connecting portion, wherein the crystal cover and the crystal slot define a crystal cavity, and the crystal cavity is used to place a crystal;

[0008] The rotating part and the crystal cover form a light channel, and the axis of the light channel passes through the crystal cavity.

[0009] Furthermore, it also includes a clamping ring, the clamping ring is provided with a first threaded portion, the outer periphery of the rotating portion is provided with a second threaded portion, and the first threaded portion is threadedly connected with the second threaded portion.

[0010] Furthermore, the liquid cooling structure is provided with a fixing structure, and the fixing structure is used to fix the rotating part.

[0011] Furthermore, the fixing structure includes a fastening screw, the liquid cooling structure is provided with a fastening hole, the fastening hole is communicated with the cooling hole, and the fastening screw cooperates with the fastening hole.

[0012] Furthermore, the crystal cover comprises a cover body and an abutting portion, the cover body is connected to the connecting portion, one end of the abutting portion is connected to the cover body, and the other end of the abutting portion is used to abut against the crystal.

[0013] Furthermore, the abutting portion has a boss structure, and the boss structure is arranged in the crystal groove.

[0014] Furthermore, the liquid cooling structure is provided with a liquid cooling channel, and the liquid cooling channel is provided around the cooling hole.

[0015] Furthermore, the rotating structure, the liquid cooling structure and the crystal cover are metal structural parts.

[0016] Furthermore, thermally conductive adhesive is provided in the crystal cover and the crystal groove, and the thermally conductive adhesive is used to contact the crystal.

[0017] An embodiment of another aspect of the present application provides a terahertz time-domain spectrometer, comprising the compact high-energy laser crystal liquid cooling device as described above.

[0018] It can be seen from the above technical solutions that the embodiments of the present application have at least the following beneficial effects:

[0019] In the compact high-energy laser crystal liquid cooling device and terahertz time-domain spectrometer provided by the embodiments of the present application, the crystal cavity is used to place the crystal, and rotating the rotating part can drive the crystal cavity to rotate, thereby driving the crystal to rotate. In this way, the angle between the polarization direction of the laser and the crystal direction can be arbitrarily adjusted by driving the rotating part to rotate; wherein the rotating part is rotatably connected to the cooling hole, which improves the convenience of angle adjustment; at the same time, the outer sleeve of the rotating part is provided with cooling holes, which is beneficial to the heat dissipation of the crystal, and can effectively reduce the overall space, making the structure of the entire device more compact. In addition, compared with the air-cooled heat dissipation solution, this embodiment dissipates heat from the crystal through a liquid cooling structure, has high heat dissipation efficiency, and does not affect the stability of the optical path. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A schematic structural diagram of a compact high-energy laser crystal liquid cooling device provided in one embodiment of the present application;

[0022] Figure 2A schematic cross-sectional view of a compact high-energy laser crystal liquid cooling device provided in one embodiment of the present application;

[0023] Figure 3 for Figure 2 A partial enlarged schematic diagram of part A;

[0024] Figure 4 This is a schematic structural diagram of a rotating structure in one embodiment of the present application;

[0025] Figure 5 for Figure 4 A cross-sectional schematic diagram of the rotating structure in FIG.

[0026] Figure 6 This is a schematic diagram of the structure of a crystal cover in one embodiment of the present application;

[0027] Figure 7 A schematic structural diagram of a crystal cover from another perspective in an embodiment of the present application;

[0028] Figure 8 The figure is a schematic diagram of the arrangement of cooling channels in one embodiment of the present application.

[0029] Reference numerals:

[0030] 100, rotating structure; 110, connecting portion; 111, matching groove; 120, rotating portion; 121, first threaded portion; 122, crystal groove; 123, crystal cavity; 124, step structure;

[0031] 200, liquid cooling structure; 210, liquid cooling channel; 211, first port; 212, second port; 220, connecting hole; 230, drilling hole; 240, cooling hole;

[0032] 300, crystal cover; 310, cone surface; 320, cover body; 330, abutment portion; 331, boss structure; 332, abutment portion body;

[0033] 400, snap ring;

[0034] 500. Optical channel. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] In the field of lasers, engineers will determine the angle of the laser crystal and install it in a fixed manner for commercial lasers. However, in R&D laboratories, due to different experimental requirements, it is often necessary to adjust the crystal angle. Existing lasers cannot simultaneously meet the two requirements of laser crystal cooling and rotation adjustment of the angle.

[0037] In the field of terahertz sources, there is no customized heat dissipation structure specifically for nonlinear optical crystals that generate terahertz radiation. The main reason is that in most cases, the laser power density is lower than the crystal damage threshold, and the crystal directly dissipates the generated heat into the surrounding environment, without the need for specially customized heat dissipation devices. However, with the needs of scientific research, people's demand for strong terahertz sources is increasing. In the case of the same crystal, increasing the laser power density can increase the intensity of terahertz radiation. When the laser power density is higher than the crystal damage threshold, the crystal will be damaged. In order to ensure the service life of the crystal, it is not enough to rely solely on the crystal itself to dissipate heat. Therefore, it is necessary to provide a heat dissipation device for the laser crystal.

[0038] In view of this, the embodiments of the present application provide a compact high-energy laser crystal liquid cooling device and a terahertz time-domain spectrometer to effectively solve the aforementioned problems.

[0039] See also Figure 1 As shown, an embodiment of the first aspect of the present application discloses a compact high-energy laser crystal liquid cooling device, including a rotating structure 100 , a liquid cooling structure 200 and a crystal cover 300 .

[0040] For details, see Figures 1 to 7 The rotating structure 100 includes a connecting portion 110 and a rotating portion 120 connected to each other. The outer periphery of the rotating portion 120 is cylindrical, and the rotating portion 120 is provided with a crystal groove 122; the liquid cooling structure 200 has a cooling hole 240 matching the outer periphery of the rotating portion 120, and the rotating portion 120 is rotatably connected to the cooling hole 240, so that the liquid cooling structure 200 can cool the rotating portion 120; the crystal cover 300 is connected to the connecting portion 110, and the crystal cover 300 and the crystal groove 122 define a crystal cavity 123, and the crystal cavity 123 is used to place the crystal. Among them, the rotating portion 120 and the crystal cover 300 form an optical channel 500, and the axis of the optical channel 500 passes through the crystal cavity 123.

[0041] Among them, the connecting part 110 is provided with a matching groove 111 corresponding to the crystal groove 122, so that the crystal cover 300 can define a crystal cavity 123 with the crystal groove 122; the optical channel 500 runs through the crystal cover 300, the liquid cooling structure 200 and the rotating structure 100, and the axis of the optical channel 500 passes through the crystal cavity 123, thereby, the incident light is irradiated from the optical channel 500 to the crystal in the crystal cavity 123.

[0042] In the compact high-energy laser crystal liquid cooling device provided in the embodiment of the present application, the crystal cavity 123 is used to place the crystal, and the rotation of the rotating part 120 can drive the crystal cavity 123 to rotate, thereby driving the crystal to rotate. In this way, the angle between the polarization direction of the laser and the crystal direction can be adjusted arbitrarily; wherein the rotating part 120 is rotatably connected to the cooling hole 240, which improves the convenience of angle adjustment; at the same time, the outer sleeve of the rotating part 120 is provided with a liquid cooling structure 200, which is conducive to the heat dissipation of the crystal, and can effectively reduce the overall space, making the structure of the entire device more compact.

[0043] In some embodiments of the present application, see Figure 1 and Figure 2 The compact high-energy laser crystal liquid cooling device also includes a retaining ring 400, the retaining ring 400 is provided with a first threaded portion 121, the outer periphery of the rotating portion 120 is provided with a second threaded portion, and the first threaded portion 121 is threadedly connected to the second threaded portion. Specifically, the second threaded portion of the rotating portion 120 extends from the cooling hole 240 to a position outside the end face of the liquid cooling structure 200. By matching the first threaded connection portion 121 and the second threaded connection portion, the retaining ring 400 can be abutted against the liquid cooling structure 200, so that the rotating structure 100, the liquid cooling structure 200 and the crystal cover 300 are relatively fixed. When it is necessary to adjust the angle between the crystal and the incident light, the retaining ring 400 is rotated to move the retaining ring 400 in a direction away from the liquid cooling structure 200, so that the rotating structure 100 can be loosened. In this way, the rotating portion 120 can be driven to rotate by driving the connecting portion 110 to rotate, thereby changing the angle between the crystal and the incident light.

[0044] In some embodiments of the present application, the liquid cooling structure 200 is provided with a fixing structure, and the fixing structure is used to fix the rotating part 120 to limit the relative rotation of the rotating part 120 and the liquid cooling structure 200.

[0045] In one possible implementation, see Figure 1 The fixing structure includes a fastening screw, and the liquid cooling structure 200 is provided with a fastening hole, the fastening hole is communicated with the cooling hole 240, and the fastening screw cooperates with the fastening hole. Specifically, after the angle of the rotating part 120 is adjusted, the fastening screw is screwed into the fastening hole, and the fastening screw is pressed on the outer periphery of the rotating part 120 to fix the rotating part 120.

[0046] In some embodiments of the present application, see Figures 1 to 3 , Figure 6 and Figure 7The crystal cover 300 includes a cover body 320 and an abutting portion 330. The cover body 320 is connected to the connecting portion 110. One end of the abutting portion 330 is connected to the cover body 320, and the other end of the abutting portion 330 is used to abut against the crystal. Thus, the crystal can be fixed by the crystal cover 300. At the same time, the abutting portion 330 of the crystal cover 300 abuts against the crystal, and the abutting portion 330 is in contact and connected with the connecting portion 110 through the cover body 320, so that the heat on the surface of the crystal can be conducted to the crystal cover 300 and the rotating structure 100, and the heat in the crystal cover 300 and the rotating structure 100 can be transferred to the liquid cooling structure 200, thereby ensuring the heat dissipation effect of the crystal.

[0047] In one possible implementation, see Figure 3 and Figure 7 The abutting portion 330 has a boss structure 331, and the boss structure 331 is disposed in the crystal groove 122. Specifically, the boss structure 331 contacts one of the end faces of the crystal, and the heat generated by the crystal can be transferred to the abutting portion 330 through the boss structure 331, and then transferred to the connecting portion 110 through the abutting portion 330 and the cover 320, and then transferred to the rotating portion 120 through the connecting portion 110, so that the heat is absorbed by the liquid cooling structure 200.

[0048] Further, see Figures 2 to 5 , the rotating structure 100 has a matching groove 111 for accommodating the abutment part 330, the bottom wall of the crystal groove 122 is lower than the bottom of the matching groove 111, and there is a certain interval between the groove wall of the crystal groove 122 and the groove wall of the matching groove 111, that is, a step structure 124 is formed between the crystal groove 122 and the matching groove 111. The abutment part 330 includes an abutment part body 332 and a boss structure 331, the boss structure 331 protrudes and is arranged with the bottom end surface of the abutment part body 332, and the bottom end surface of the abutment part body 332 abuts against the step structure 124. In this way, after the heat generated by the crystal is transferred to the boss structure 331, it can be transferred to the rotating part 120 along the transfer path of the boss structure 331, the abutment part body 332, and the step structure 124, and the rotating part 120 cooperates with the cooling hole 240, so that the heat transfer path can be shortened, thereby helping to improve the heat dissipation efficiency.

[0049] In this embodiment, see Figure 2 and Figure 6 The crystal cover 300 is provided with a light channel 500 , and the light channel 500 is arranged to coincide with the axis of the light channel 500 of the rotating structure 100 .

[0050] Furthermore, a conical surface 310 is provided at a position of the cover body 320 corresponding to the light channel 500 , and the cross-sectional area of ​​the conical surface 310 gradually increases in a direction gradually away from the crystal groove 122 .

[0051] In some embodiments of the present application, the liquid cooling structure 200 is provided with a liquid cooling channel 210, and the liquid cooling channel 210 is provided around the cooling hole 240 to improve the heat dissipation efficiency. Compared with air cooling, the liquid cooling structure 200 of the present application has a better heat dissipation effect and does not affect the stability of the optical path.

[0052] In one possible implementation, see Figure 8 , the liquid cooling channel 210 is formed by connecting four sections of drilled holes 230 in sequence. Specifically, the liquid cooling channel 210 includes a first port 211 and a second port 212, which are respectively used to connect to the liquid inlet and liquid outlet of the cooling system. Among them, the position where each section of the drilled hole 230 is connected to the outside is sealed with a sealing material or a seal. Exemplarily, the position where each section of the drilled hole 230 is connected to the outside is sealed by tightening the screws and then applying a sealant. In this embodiment, the liquid cooling channel 210 is composed of drilled holes 230, which can simplify the processing technology of the liquid cooling channel 210 and reduce the manufacturing cost.

[0053] It should be noted that the liquid cooling channel 210 may be composed of a plurality of drilled holes 230 in sequence, which is not limited herein.

[0054] In this embodiment, see Figure 8 A connection hole 220 is provided on the side of the liquid cooling structure 200 for connecting to the outside.

[0055] Furthermore, the rotating structure 100, the liquid cooling structure 200 and the crystal cover 300 are metal structural parts. Specifically, the metal structural parts have a good heat dissipation effect and can effectively ensure the heat dissipation effect.

[0056] In a possible implementation, the rotating structure 100, the liquid cooling structure 200 and the metal cover are made of copper, which has a good heat dissipation effect, thereby ensuring the heat dissipation effect.

[0057] In the above embodiment, the liquid cooling structure 200 is a water circulation structure. Of course, in other embodiments, relatively cheap brass materials or other materials can also be selected according to actual heat dissipation requirements, costs, etc.

[0058] In some embodiments of the present application, thermally conductive adhesive is provided in the crystal cover 300 and the crystal groove 122 , and the thermally conductive adhesive is used to contact the crystal to improve the heat dissipation effect.

[0059] In one embodiment of the present application, the rotating structure 100 can rotate 360° in a plane perpendicular to the incident light, and the angle between the polarization direction of the laser and the crystal orientation can be adjusted arbitrarily, which is convenient for adjustment. In addition, a fixed structure is designed on the liquid cooling structure 200. After the rotating part 120 is adjusted to the optimal angle, the crystal can be fixed by limiting the rotation of the rotating part 120 using the fixed structure.

[0060] In the embodiment of the present application, the liquid cooling structure 200 is arranged around the crystal, which is more beneficial to the heat dissipation of the crystal and reduces the overall space, making the structure more compact.

[0061] In one application scenario, the compact high-energy laser crystal liquid cooling device of this embodiment is used in the field of terahertz sources as a heat dissipation structure of the nonlinear optical crystal of the terahertz source. It does not affect the rotation of the crystal while ensuring heat dissipation, and provides technical support for the development of high-power and high-intensity terahertz sources.

[0062] In some embodiments, the rotating part 120 can be driven to rotate by an electric device. Exemplarily, the electric device is an electric rotating table, which is used to drive the rotating part 120 to rotate. By controlling the rotation of the rotating part 120 by the electric rotating table, the rotation accuracy can be improved, and the operation can be performed outside the optical path, which is convenient and fast.

[0063] In the embodiments of the present application, the size of each structural member or structure is not strictly limited. For example, the cross-sectional size of the optical channel 500 is determined by the size of the incident light spot. For another example, the shape and size of the crystal slot 122 are determined by the shape and size of the crystal to be cooled; the size of the aperture of the liquid cooling channel 210 is determined by the actual cooling demand and can be appropriately increased to increase the cooling efficiency by increasing the aperture size of the liquid cooling channel 210.

[0064] The embodiment of the second aspect of the present application discloses a terahertz time-domain spectrometer, including the compact high-energy laser crystal liquid cooling device as described above, and has all the technical effects of the aforementioned compact high-energy laser crystal liquid cooling device, which will not be repeated here.

[0065] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 application.

[0066] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0067] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0069] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

Claims

1. A compact high-energy laser crystal liquid cooling device, characterized in that: include: The rotating structure comprises a connecting part and a rotating part connected to each other, wherein the outer periphery of the rotating part is cylindrical and the rotating part is provided with a crystal groove; A liquid cooling structure, having a cooling hole matching the outer periphery of the rotating part, the rotating part being rotatably connected to the cooling hole, and the cooling hole being used to cool the rotating part; A crystal cover connected to the connecting portion, wherein the crystal cover and the crystal slot define a crystal cavity, and the crystal cavity is used to place a crystal; The rotating part and the crystal cover form a light channel, and the axis of the light channel passes through the crystal cavity.

2. The compact high-energy laser crystal liquid cooling device according to claim 1, characterized in that: It also includes a clamping ring, which is provided with a first threaded portion, and the outer periphery of the rotating portion is provided with a second threaded portion, and the first threaded portion is threadedly connected with the second threaded portion.

3. The compact high-energy laser crystal liquid cooling device according to claim 1 or 2, characterized in that: The liquid cooling structure is provided with a fixing structure, and the fixing structure is used to fix the rotating part.

4. The compact high-energy laser crystal liquid cooling device according to claim 3, characterized in that: The fixing structure comprises a fastening screw, the liquid cooling structure is provided with a fastening hole, the fastening hole is communicated with the cooling hole, and the fastening screw cooperates with the fastening hole.

5. The compact high-energy laser crystal liquid cooling device according to claim 1, characterized in that: The crystal cover comprises a cover body and an abutting portion, wherein the cover body is connected to the connecting portion, one end of the abutting portion is connected to the cover body, and the other end of the abutting portion is used to abut against the crystal.

6. The compact high-energy laser crystal liquid cooling device according to claim 5, characterized in that: The abutting portion has a boss structure, and the boss structure is arranged in the crystal groove.

7. The compact high-energy laser crystal liquid cooling device according to claim 1, characterized in that: The liquid cooling structure is provided with a liquid cooling channel, and the liquid cooling channel is arranged around the cooling hole.

8. The compact high-energy laser crystal liquid cooling device according to claim 7, characterized in that: The rotating structure, the liquid cooling structure and the crystal cover are metal structural parts.

9. The compact high-energy laser crystal liquid cooling device according to claim 1, characterized in that: The crystal cover and the crystal groove are provided with heat-conducting glue, and the heat-conducting glue is used for contacting with the crystal.

10. A terahertz time-domain spectrometer, characterized in that: The invention comprises a compact high-energy laser crystal liquid cooling device as claimed in any one of claims 1 to 9.

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