Crystal clamping device and laser amplifier

Abstract

The utility model discloses a crystal clamping device and a laser amplifier, and the device comprises a clamp which comprises an upper cover and a lower cover which are oppositely arranged, the upper cover is connected with the lower cover, the upper cover comprises a first body part and a first protruding part, and the first protruding part is arranged in a protruding manner towards the direction of the lower cover relative to the first body part; the lower cover comprises a second body part and a second protruding part, the second protruding part protrudes towards the upper cover relative to the second body part, the first protruding part and the second protruding part are arranged in a staggered mode, and a containing cavity is formed between the first protruding part and the second protruding part; and the amplifier crystal is accommodated in the accommodating cavity. The first protruding part and the second protruding part are used for providing supporting force for the upper cover, when the upper cover abuts against the lower cover, the amplifier crystal can be fixed in the containing cavity in a pressure-free mode so that the assembly stress and thermal stress of the amplifier crystal can be reduced, the size of the clamp can be increased through the protruding design of the first protruding part and the second protruding part, and the heat transfer efficiency of the clamp can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser amplifiers, in particular to a crystal clamping device and a laser amplifier. Background Art

[0002] Laser amplifiers mainly amplify the energy of laser pulses through amplifier crystals. At present, laser amplifiers have been widely used in industrial processing, and the life and stability of laser amplifiers are also the difficulties of industrial application lasers. As the core component of laser amplifiers, amplifier crystals are also an important factor affecting the life and stability of laser amplifiers. Since amplifier crystals will generate heat as the laser energy increases when working, if the heat cannot be conducted and dissipated in time, it will cause thermal effects in the amplifier crystals and make the laser amplifier unable to work normally. Therefore, reducing the thermal effects of amplifier crystals has become a research direction in laser technology.

[0003] In the related art, a certain thickness of metal indium is used to wrap the amplifier crystal, and then the amplifier crystal is fixed in the fixture by screws. In this design, the use of metal indium to wrap the amplifier crystal can reduce the thermal effect of the amplifier crystal to a certain extent, but because the amplifier crystal is mechanically clamped by screws, the clamp and the screws will generate mechanical stress on the amplifier crystal, so that the amplifier crystal has high assembly stress and thermal stress. At the same time, the current structural design of the clamp cannot maximize the volume of the clamp to reduce the thermal effect of the amplifier crystal. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a crystal clamping device, which can reduce the assembly stress and thermal stress of the clamp on the amplifier crystal and effectively reduce the thermal effect of the amplifier crystal.

[0005] According to the first embodiment of the present invention, the crystal clamping device comprises:

[0006] A clamp, the clamp comprising an upper cover and a lower cover arranged opposite to each other, the upper cover being connected to the lower cover, the upper cover comprising a first body portion and a first protrusion portion, the first protrusion portion being arranged protruding relative to the first body portion toward the lower cover; the lower cover comprising a second body portion and a second protrusion portion, the second protrusion portion being arranged protruding relative to the second body portion toward the upper cover, the first protrusion portion and the second protrusion portion being arranged in a staggered manner, and an accommodating cavity being formed between the first protrusion portion and the second protrusion portion;

[0007] An amplifier crystal is accommodated in the accommodating cavity.

[0008] The crystal clamping device according to the embodiment of the utility model has at least the following beneficial effects: the first protrusion and the second protrusion are used to provide a supporting force for the upper cover, so that when the upper cover is abutted against the lower cover, the amplifier crystal can be fixed in the accommodating cavity without pressure, so as to reduce the assembly stress and thermal stress of the amplifier crystal. At the same time, the protruding design of the first protrusion and the second protrusion can increase the volume of the clamp and improve the heat transfer efficiency of the clamp.

[0009] According to some embodiments of the present invention, the second body portion has a heat sink surface and a fixing surface on one side facing the upper cover, the heat sink surface is in contact with the amplifier crystal, and the fixing surface is recessed downward relative to the heat sink surface.

[0010] According to some embodiments of the present invention, the upper cover has a first outer periphery, the heat sink surface and the second raised portion respectively have a plurality of boundary lines, the plurality of boundary lines of the heat sink surface and the second raised portion define a second outer periphery, and the shape of the first outer periphery matches the shape of the second outer periphery.

[0011] According to some embodiments of the present invention, the second outer periphery includes a first boundary line and a fifth boundary line on the heat sink surface, and a third boundary line on the second protrusion, the first boundary line is aligned with one end of the amplifier crystal, the fifth boundary line and the third boundary line are respectively connected to the two ends of the first boundary line, and the angle between the third boundary line and the first boundary line is not less than the angle between the fifth boundary line and the first boundary line.

[0012] According to some embodiments of the present invention, the heat sink surface and the fixing surface are transitioned through an inclined surface.

[0013] According to some embodiments of the present utility model, the first protrusion has a first surface, the second protrusion has a second surface, the amplifier crystal has a light-transmitting end face, the light-transmitting end face is located between the first surface and the second surface, and forms an angle with the first surface and the second surface respectively, the angle between the second surface and the light-transmitting end face is not less than the angle between the first surface and the light-transmitting end face, and the first surface and the second surface jointly define a light path.

[0014] According to some embodiments of the utility model, a first fitting surface is provided on the side of the first protrusion facing the second protrusion, and a second fitting surface is provided on the side of the second protrusion facing the first protrusion, and the first fitting surface and the second fitting surface are arranged opposite to each other, wherein the first fitting surface, the second fitting surface, the heat sink surface and the lower surface of the first main body portion enclose the accommodating cavity.

[0015] According to some embodiments of the present invention, the second body portion is provided with a guide groove, and the guide groove is communicated with the accommodating cavity.

[0016] According to some embodiments of the present invention, the amplifier crystal is wrapped with a heat-conducting medium, and the heat-conducting medium fills the gap between the accommodating cavity and the amplifier crystal.

[0017] The laser amplifier according to the embodiment of the second aspect of the utility model includes a housing, a refrigeration device and a crystal clamping device as described in any of the above embodiments, wherein the refrigeration device is arranged in the housing, and the crystal clamping device is detachably connected to the inside of the housing and in contact with the refrigeration device.

[0018] The laser amplifier according to the embodiment of the utility model has at least the following beneficial effects: the crystal clamping device and the refrigeration device are both arranged inside the shell, which can make the laser amplifier have a smaller volume, and the refrigeration device transfers low-temperature heat to the crystal clamping device, which can timely conduct and dissipate the heat of the amplifier crystal, effectively reducing the thermal effect of the amplifier crystal.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 A schematic diagram of a crystal clamping device according to an embodiment of the utility model;

[0022] Figure 2 An exploded view of a crystal clamping device according to an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of a clamp according to an embodiment of the utility model;

[0024] Figure 4 A schematic diagram of a clamp according to an embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the lower cover of an embodiment of the utility model;

[0026] Figure 6 A schematic diagram of a second outer periphery of the lower cover of an embodiment of the utility model;

[0027] Figure 7 This is a schematic diagram of the lower cover of an embodiment of the utility model;

[0028] Figure 8 For the utility model embodiment Figure 7A magnified image of point A;

[0029] Fig. 9 A schematic diagram of an upper cover of an embodiment of the utility model;

[0030] Fig.10 A schematic diagram of an upper cover of an embodiment of the utility model;

[0031] Fig.11 Schematic diagram of a laser amplifier according to an embodiment of the utility model.

[0032] Reference numerals:

[0033] Crystal clamping device 100; clamp 200; upper cover 300; first outer periphery 301; first body part 310; first protruding part 320; first surface 321; first fitting surface 322; flat push surface 330; lower cover 400; second outer periphery 401; second body part 410; heat sink surface 411; fixing surface 412; fixing part 413; through hole 414; second protruding part 420; second surface 421; second fitting surface 422; inclined surface 430; guide groove 440; first boundary line 451; second boundary line 452; third boundary line 453; fourth boundary line 454; fifth boundary line 455; sixth boundary line 456; accommodating cavity 500; amplifier crystal 600; light-transmitting end face 610; laser amplifier 700; housing 710; cooling device 720. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments 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.

[0035] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, 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 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 cannot be understood as a limitation on the present invention.

[0036] In the description of the present utility model, "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 to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] 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.

[0038] In the description of the utility model, 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 utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0039] The crystal clamping device 100 of the present invention is described below with reference to the accompanying drawings.

[0040] See also Figure 1 and Figure 2As shown, the crystal clamping device 100 according to the embodiment of the utility model includes a clamp 200 and an amplifier crystal 600, wherein the clamp 200 includes an upper cover 300 and a lower cover 400, and the upper cover 300 is connected to the lower cover 400 by screws. In other embodiments, the upper cover 300 can also be connected and fixed to the lower cover 400 by snap connection, key connection, mortise and tenon connection or other methods. The upper cover 300 includes a first body portion 310 and a first protrusion portion 320, and the first protrusion portion 320 is protruded relative to the first body portion 310 toward the direction of the lower cover 400. Similarly, the lower cover 400 includes a second body portion 410 and a second protrusion portion 420, and the second protrusion portion 420 is protruded relative to the second body portion 410 toward the direction of the upper cover 300. The first protrusion 320 and the second protrusion 420 are staggered. When the upper cover 300 is connected to the lower cover 400, the first protrusion 320 and the second protrusion 420 do not directly contact each other, but are staggered. An accommodating cavity 500 is formed between the first protrusion 320 and the second protrusion 420, and the amplifier crystal 600 is accommodated in the accommodating cavity 500. Due to the convex design of the first protrusion 320 and the second protrusion 420, when the upper cover 300 is connected to the lower cover 400, the first protrusion 320 and the second protrusion 420 provide a supporting force for the upper cover 300, and the supporting force prevents the upper cover 300 from generating additional pressure on the amplifier crystal 600, thereby reducing the assembly stress and thermal stress of the amplifier crystal 600. In addition, the use of the convex design can also increase the overall volume of the clamp 200 to improve the heat transfer efficiency of the clamp 200, provide a better heat dissipation effect for the amplifier crystal, and thus reduce the thermal effect of the amplifier crystal 600.

[0041] In some embodiments, see Figures 3 to 5As shown, the second body portion 410 has a heat sink surface 411 and a fixing surface 412 on one side facing the upper cover 300. When the amplifier crystal 600 is accommodated in the accommodating cavity 500, the amplifier crystal 600 contacts the heat sink surface 411, and the amplifier crystal 600 is placed on the heat sink surface 411. Furthermore, there is a height difference between the heat sink surface 411 and the fixing surface 412, and the fixing surface 412 is recessed downward relative to the heat sink surface 411. The heat sink surface 411 transitions to the fixing surface 412 through the inclined surface 430. The use of the inclined surface 430 for transition can make the heat conduction faster, thereby improving the thermal conductivity efficiency of the clamp 200. If the inclined surface 430 is not provided, when the heat is transferred through the plane where the angle between the heat sink surface 411 and the fixed surface 412 is located, the heat of the amplifier crystal 600 needs to be transferred from the heat sink surface 411 to the fixed surface 412 in the vertical downward direction first, and then distributed on the fixed surface 412 through lateral translation. According to the theorem that the sum of the two sides of a triangle is greater than the third side, it can be known that directly using the inclined surface 430 for transition will shorten the distance that the heat of the amplifier crystal 600 passes during the transfer process. Similarly, using the inclined surface 430 for transition can also make the low-temperature heat of the fixture 200 transfer to the amplifier crystal 600 faster, and perform cold and heat exchange with the amplifier crystal 600, thereby better dissipating heat for the amplifier crystal 600.

[0042] In some embodiments, see Figure 5 , Figure 6 and Fig. 9 As shown, since the second protrusion 420 is protruded relative to the second body part 410 toward the upper cover 300, and the heat sink surface 411 and the fixing surface 412 are part of the second body part 410, the second protrusion 420 also protrudes upward relative to the heat sink surface 411 and the fixing surface 412, and the second protrusion 420 is connected to the heat sink surface 411. In this embodiment, the heat sink surface 411 and the second protrusion 420 are integrally formed, and the second protrusion 420 is formed on one side of the heat sink surface 411 and protrudes upward. In other embodiments (not shown in the figure), the heat sink surface 411 and the second protrusion 420 can be detachably connected, and the two can be connected and fixed by means of snap connection, threaded connection, etc. Among them, the upper cover 300 has a first outer periphery 301, and the heat sink surface 411 and the second protrusion 420 of the lower cover 400 respectively have a plurality of boundary lines. The boundary line of the heat sink surface 411 and the boundary line of the second protrusion 420 cooperate with each other to form the outer periphery of the lower cover 400, so that the lower cover 400 has a second outer periphery 401. The shapes of the first outer periphery 301 and the second outer periphery 401 are adapted to each other.

[0043] Specifically, the heat sink surface 411 has a first boundary line 451 and a second boundary line 452, and the first boundary line 451 and the second boundary line 452 are arranged opposite to each other. The first boundary line 451 and the second boundary line 452 are respectively located at the two ends of the accommodating cavity 500, and jointly define the width of the accommodating cavity 500, and the first boundary line 451 and the second boundary line 452 are respectively aligned with the two ends of the amplifier crystal 600. The second protrusion 420 has a third boundary line 453 and a fourth boundary line 454. Among them, the third boundary line 453 is arranged at one end of the first boundary line 451, and the fifth boundary line 455 is arranged at the other end. The fifth boundary line 455 is one of the boundary lines of the heat sink surface 411, and the third boundary line 453 and the fifth boundary line 455 form an angle with the first boundary line 451 respectively. Since the boundary line mainly defines the shape of the fixture 200, so that the shape of the fixture 200 does not hinder the normal injection and refraction of the laser beam, it can be seen from the fact that the incident angle is equal to the refraction angle that the angle between the third boundary line 453 and the first boundary line 451 is not less than the angle between the fifth boundary line 455 and the first boundary line 451. Similarly, a fourth boundary line 454 is provided at one end of the second boundary line 452, and a sixth boundary line 456 is provided at the other end. The sixth boundary line 456 is also one of the boundary lines of the heat sink surface 411. The fourth boundary line 454 and the sixth boundary line 456 respectively form an angle with the second boundary line 452. The angle between the fourth boundary line 454 and the second boundary line 452 is not less than the angle between the sixth boundary line 456 and the second boundary line 452.

[0044] Furthermore, one end of the heat sink surface 411 away from the accommodating cavity 500 is connected to the fifth boundary line 455 and the sixth boundary line 456, while one end of the second protrusion 420 away from the accommodating cavity 500 is connected to the third boundary line 453 and the fourth boundary line 454. The end of the heat sink surface 411, the end of the second protrusion 420 and the multiple boundary lines cooperate with each other to jointly define the shape structure of the second outer periphery 401 of the lower cover 400.

[0045] Since the clamp 200 not only clamps the amplifier crystal 600, but also needs to make the amplifier crystal 600 work normally, the clamping part of the clamp 200 is composed of the upper cover 300, the heat sink surface 411 and the second protrusion 420. In order to make the laser irradiate the amplifier crystal 600 normally without being blocked by the clamp 200, the shape structure of the clamping part is the shape structure of the second outer periphery 401.

[0046] See also Figure 4 and Figure 5As shown, the first protrusion 320 has a first surface 321, the second protrusion 420 has a second surface 421, and the amplifier crystal 600 has a light-transmitting end surface 610. The light-transmitting end surface 610 is located between the first surface 321 and the second surface 421, and both the first surface 321 and the second surface 421 form an angle with the light-transmitting end surface 610, and the angle between the second surface 421 and the light-transmitting end surface 610 is not less than the angle between the first surface 321 and the light-transmitting end surface 610. Since the first surface 321 is the incident end of the laser beam, and the second surface 421 is the refraction end of the laser beam, it can be known from the fact that the incident angle is equal to the refraction angle that the angle between the second surface 421 and the light-transmitting end surface 610 is not less than the angle between the first surface 321 and the light-transmitting end surface 610. The first surface 321 and the second surface 421 together define a light path of the laser beam. In some embodiments, in order to maximize the shape structure of the second outer periphery 401 , the angle between the second surface 421 and the light-transmitting end surface 610 is equal to the angle between the first surface 321 and the light-transmitting end surface 610 .

[0047] Specifically, since the shapes of the first outer periphery 301 and the second outer periphery 401 are adapted to each other, when the upper cover 300 and the lower cover 400 are connected, the first surface 321 is engaged with the fifth boundary line 455, and the position of the first surface 321 is the position of the fifth boundary line 455, and the third boundary line 453 is one of the boundary lines of the second surface 421. When the amplifier crystal 600 is working, the laser beam will be injected from the first surface 321 side of the first protrusion 320. In the best case, the laser beam will hit the light-transmitting end surface 610 of the amplifier crystal 600, and the laser beam will pass through the inside of the amplifier crystal 600 to achieve the energy amplification of the laser beam. However, since the laser beam will be scattered during irradiation, part of the laser beam will hit the light-transmitting end surface 610 of the amplifier crystal 600 and be refracted, and the refracted laser beam will be emitted toward the second surface 421 of the second protrusion 420. In actual operation, in order to make the laser beam more accurately irradiate the amplifier crystal 600, it is necessary to determine the position of the laser beam irradiation through the refracted laser beam, so as to adjust the position of the laser beam injection to make the laser beam irradiation position optimal. Among them, in the case of laser beam scattering, the beam with the largest scattering angle will be injected along the edge of the first surface 321. Therefore, in the case of the largest scattering angle, the first surface 321 will not block the normal injection of the laser beam. Similarly, the second surface 421 will not block the normal refraction of the laser beam.

[0048] The larger the volume of the clamp 200, the higher the heat transfer efficiency. Therefore, the clamp 200 needs to have a maximized volume without blocking the injection and refraction of the laser beam. The second outer periphery 401 formed by multiple boundary lines is the maximum volume that the clamping part can have without blocking the irradiation path of the laser beam. Furthermore, the heat sink surface 411 and the second protrusion 420 are both protruded upward relative to the fixed surface 412, and the overall volume of the clamp 200 can be increased by the protrusion. Because the heat generated by the amplifier crystal 600 can be better transferred, the thermal effect of the amplifier crystal 600 is reduced.

[0049] In some embodiments, the center of the boundary line formed by the first boundary line 451, the third boundary line 453 and the fifth boundary line 455 is symmetrical to the boundary line formed by the second boundary line 452, the fourth boundary line 454 and the sixth boundary line 456. This ensures that the overall shape structure of the clamping portion is symmetrical to the geometric center of the amplifier crystal 600, so that no matter the laser beam enters from the first surface 321 side or from the side symmetrical to the center of the first surface 321, it can be ensured that the clamping portion will not block the irradiation path of the laser beam, so that the laser beam can normally irradiate the amplifier crystal 600.

[0050] Furthermore, in actual applications, the bottom of the lower cover 400 needs to be connected to a refrigeration device to dissipate heat for the fixture. When the refrigeration effect is the best, the bottom of the lower cover 400 should match the size of the refrigeration device. Therefore, the bottom of the lower cover 400 cannot infinitely expand its volume to improve the heat transfer efficiency of the fixture 200. Similarly, as the volume of the laser amplifier is smaller, the load adjustability of the laser amplifier 700 is strong, high-precision control can be achieved, and the adjustment is convenient and fast. Therefore, limited by the overall volume of the laser amplifier, the heat sink surface 411 and the second protrusion 420 cannot be raised upward indefinitely.

[0051] In some embodiments, see Figure 5 and Figure 7 As shown, the fixing surface 412 extends outward to form a plurality of fixing parts 413, and the fixing parts 413 are provided with through holes 414, wherein, in this embodiment, the through holes 414 are oval holes, and the through holes 414 are oval holes instead of round holes because when the clamp 200 fixes the amplifier crystal 600, the oval holes can correct the partial assembly errors, that is, the oval holes can be used to allow the clamp 200 to have a certain activity space. Because the amplifier crystal 600 has a certain working life, when the laser irradiates a certain point of the amplifier crystal 600 for a long time, reaching a certain number of times will cause the injection point of the amplifier crystal 600 to be damaged, at this time, the clamp 200 can be moved through the oval holes to change the direction of the amplifier crystal 600, and change the injection point of the laser into the amplifier crystal 600, so that the amplifier crystal 600 can continue to work normally.

[0052] In some embodiments, the surface of the amplifier crystal 600 is coated with a heat-conducting medium, and the heat-conducting medium fixes the amplifier crystal 600 in the receiving cavity 500 by means of hot-melt welding. The use of the heat-conducting medium can improve the heat transfer between the amplifier crystal 600 and the clamp 200, and can effectively prevent the amplifier crystal 600 from heat accumulation to produce a thermal effect. At the same time, since the amplifier crystal 600 cannot completely fill the receiving cavity 500 when it is located in the receiving cavity 500, the heat-conducting medium can be melted by hot-melt to play a filling role, so that there is no gap and air between the amplifier crystal 600 and the receiving cavity 500, so that the air in the receiving cavity 500 can be prevented from affecting the heat transfer efficiency of the clamp 200 and the amplifier crystal 600.

[0053] In some embodiments, the heat conducting medium is metal indium, because metal indium itself has good thermal conductivity and is easier to operate during hot melt welding. In other embodiments, metal indium can also be replaced by heat conducting media such as gold, tin, or silver. Among them, gold and tin can be filled in the gap of the accommodation cavity 500 by welding, while silver can be filled by brazing.

[0054] In some embodiments, see Figure 8 As shown, the lower cover 400 is also provided with a guide groove 440, which is located on the heat sink surface 411, and is communicated with the accommodating cavity 500. Since the amount of the heat-conducting medium is greater than the gap to be filled, when the heat-conducting medium is melted, the excess heat-conducting medium will flow out along the guide groove 440, thereby preventing the excess heat-conducting medium from contaminating the light-transmitting end face 610 of the amplifier crystal 600 and affecting the normal operation of the amplifier crystal 600.

[0055] In some embodiments, see Figure 8 and Fig. 9 As shown, the first protrusion 320 is provided with a first fitting surface 322 on one side facing the second protrusion 420, and the second protrusion 420 is provided with a second fitting surface 422 on the other side facing the first protrusion 320. The first fitting surface 322 and the second fitting surface 422 are the opposite surfaces of the first protrusion 320 and the second protrusion 420. The first fitting surface 322 and the second fitting surface 422 together constitute the left and right sides of the accommodating cavity 500, and the heat sink surface 411 and the lower surface of the first body part 310 together constitute the upper and lower surfaces of the accommodating cavity 500, wherein the first fitting surface 322, the second fitting surface 422, the heat sink surface 411 and the lower surface of the first body part 310 together surround each other to form the accommodating cavity 500.

[0056] Further, see Figure 4 and Fig.10As shown, a flat push surface 330 is provided on one side of the upper cover 300, and the flat push surface 330 is parallel to the first fitting surface 322 and the second fitting surface 422. When the amplifier crystal 600 is located in the accommodating cavity 500 and the amplifier crystal 600 is fixed by hot-melt welding, the two side surfaces of the amplifier crystal 600 contact the first fitting surface 322 and the second fitting surface 422. By applying an external force to the flat push surface 330, the first fitting surface 322 and the second fitting surface 422 can respectively generate an extrusion force on the amplifier crystal 600, thereby improving the welding fixation effect.

[0057] In some embodiments, the fixture 200 is made of copper. Since copper has high thermal conductivity, is easy to process, and is moderately priced, and copper is purer than ordinary copper, it is more suitable for making a thermally conductive fixture 200. At the same time, the fixture 200 made of gold-plated copper makes the heat conduction of the entire device faster, and promotes the reaction of the cold and heat exchange of the semiconductor refrigeration laser amplifier 700 to be more sensitive. At the same time, the outer surface of the copper is plated with gold so that the outer surface of the fixture 200 has a gold-plated layer, wherein the thickness of the gold-plated layer is between 2 microns and 3 microns. The gold plating can prevent the surface of the copper material from chemical reactions such as oxidation to form an oxide film, and the gold plating can enhance the surface stability of the copper, and has the advantages of oxidation resistance and high gloss. At the same time, it can fill the small pits on the surface of the fixture 200 and improve the thermal conductivity of the fixture 200.

[0058] According to the laser amplifier 700 of the second embodiment of the present invention, see Fig.11 As shown, it includes a housing 710, a refrigeration device 720 and a crystal clamping device 100 in any of the above embodiments, wherein the housing 710 has a storage space inside, the refrigeration device 720 is arranged at the bottom of the housing 710 and connected to the bottom wall of the storage space, and the clamp 200 of the crystal clamping device 100 is connected above the refrigeration device 720 and attached to the refrigeration device 720 by the lower cover 400. The crystal clamping device 100 is detachably connected to the inside of the housing 710. In this embodiment, the crystal clamping device 100 is connected to the inside of the housing 710 by screws. In other embodiments, the crystal clamping device 100 can also be fixed to the inside of the housing 710 by other connection methods such as snap connection, or pin connection. Since the crystal clamping device 100 and the refrigeration device 720 are both arranged inside the housing 710, the laser amplifier 700 has a smaller volume, and the load adjustability of the laser amplifier 700 is strong, high-precision control can be achieved, and the adjustment is convenient and fast. Furthermore, the refrigeration device 720 transfers low-temperature heat to the crystal clamping device 100 , so that there is a temperature difference between the clamp 200 and the amplifier crystal 600 , thereby being able to conduct and dissipate the heat of the amplifier crystal 600 in time, effectively reducing the thermal effect of the amplifier crystal 600 .

[0059] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model 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 utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A crystal holding device, characterized in that: include: A clamp, the clamp comprising an upper cover and a lower cover arranged opposite to each other, the upper cover being connected to the lower cover, the upper cover comprising a first body portion and a first protrusion portion, the first protrusion portion being arranged to protrude relative to the first body portion toward the lower cover; The lower cover comprises a second body portion and a second protrusion portion, the second protrusion portion is protruded relative to the second body portion toward the upper cover, the first protrusion portion and the second protrusion portion are staggered, and an accommodation cavity is formed between the first protrusion portion and the second protrusion portion; An amplifier crystal is accommodated in the accommodating cavity.

2. The crystal holding device according to claim 1, characterized in that: The second body portion has a heat sink surface and a fixing surface on one side facing the upper cover. The heat sink surface is in contact with the amplifier crystal, and the fixing surface is recessed downward relative to the heat sink surface.

3. The crystal holding device according to claim 2, characterized in that: The upper cover has a first outer periphery, the heat sink surface and the second protrusion have a plurality of boundary lines respectively, the plurality of boundary lines of the heat sink surface and the second protrusion define a second outer periphery, and the shape of the first outer periphery matches the shape of the second outer periphery.

4. The crystal holding device according to claim 3, characterized in that: The second outer periphery includes a first boundary line and a fifth boundary line on the heat sink surface, and a third boundary line on the second protrusion, the first boundary line is aligned with one end of the amplifier crystal, the fifth boundary line and the third boundary line are respectively connected to two ends of the first boundary line, and the angle between the third boundary line and the first boundary line is not less than the angle between the fifth boundary line and the first boundary line.

5. The crystal holding device according to claim 2, characterized in that: The heat sink surface and the fixing surface are transitioned through an inclined surface.

6. The crystal holding device according to claim 1, characterized in that: The first protrusion has a first surface, the second protrusion has a second surface, the amplifier crystal has a light-transmitting end face, the light-transmitting end face is located between the first surface and the second surface, and forms an angle with the first surface and the second surface respectively, the angle between the second surface and the light-transmitting end face is not less than the angle between the first surface and the light-transmitting end face, and the first surface and the second surface jointly define a light path.

7. The crystal holding device according to claim 2, characterized in that: A first fitting surface is provided on the side of the first protrusion facing the second protrusion, and a second fitting surface is provided on the side of the second protrusion facing the first protrusion, and the first fitting surface and the second fitting surface are arranged opposite to each other, wherein the first fitting surface, the second fitting surface, the heat sink surface and the lower surface of the first main body portion enclose the accommodating cavity.

8. The crystal holding device according to claim 1, characterized in that: The second body portion is provided with a guide groove, and the guide groove is communicated with the accommodating cavity.

9. The crystal holding device according to claim 1, characterized in that: The amplifier crystal is wrapped with a heat-conducting medium, and the heat-conducting medium fills the gap between the accommodating cavity and the amplifier crystal.

10. A laser amplifier, characterized in that It comprises a shell, a refrigeration device and a crystal clamping device as claimed in any one of claims 1 to 9, wherein the refrigeration device is arranged in the shell, and the crystal clamping device is detachably connected to the inside of the shell and contacts with the refrigeration device.

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