Temperature control furnace

Abstract

The invention relates to the technical field of crystal packaging, and discloses a temperature control furnace which comprises a shell, a heating assembly and a fixing assembly, the shell is provided with a containing cavity, a heat insulation sleeve surrounds the interior of the containing cavity, and one end of the shell is provided with a first light hole communicating with the containing cavity; the heating assembly comprises a hearth and a heating piece, the hearth is arranged in the containing cavity, the hearth is provided with a heating cavity penetrating through the two ends of the hearth, and the heating piece surrounds the peripheral face of the hearth so that heat can be generated and transmitted into the heating cavity; the fixing assembly is arranged in the heating cavity, and the peripheral face of the fixing assembly makes contact with the cavity wall of the heating cavity. When the temperature control furnace is used for different types of crystals, only the bearing piece, the pressing block and the cover plate which are matched with the crystals need to be replaced, the whole temperature control furnace does not need to be replaced, and therefore the temperature control furnace can be matched with the crystals produced by different manufacturers, compatibility is improved, and production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of crystal packaging, and in particular to a temperature-controlled furnace. Background Art

[0002] With the widespread application of lasers, laser-related technologies are continuously developing. In solid-state lasers, nonlinear crystals serve as the core gain medium, achieving population inversion under the excitation of a pump source, and then generating stimulated radiation through the resonant cavity and outputting laser light.

[0003] In the modern crystal packaging field, the crystal must first be encapsulated in a sealed holder, then matched with a suitable temperature-controlled furnace to maintain the crystal at the appropriate temperature. This ensures that the laser outputs high-efficiency, highly stable frequency-doubled laser light, and achieves precise control of the laser frequency through temperature tuning. However, the crystal sealing holders currently provided by different manufacturers are only compatible with their own temperature-controlled furnaces, resulting in poor compatibility between the holders and temperature-controlled furnaces, significantly increasing production costs for users. Summary of the Invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a temperature-controlled furnace.

[0005] The present application provides a temperature-controlled furnace, comprising:

[0006] A housing having a housing cavity surrounded by a heat-insulating sleeve, and a first light hole communicating with the housing cavity is formed at one end of the housing;

[0007] A heating assembly comprising a furnace and a heating element, wherein the furnace is disposed in the accommodating cavity and has a heating cavity extending through both ends thereof, and the heating element surrounds the outer circumference of the furnace to generate heat and transfer it to the heating cavity;

[0008] a fixing assembly placed in the heating chamber, wherein an outer peripheral surface of the fixing assembly contacts a cavity wall of the heating chamber;

[0009] In which, the fixing assembly includes a carrier, a cover plate, a pressure block and an elastic member. The carrier has a crystal cavity that passes through its top and is used to accommodate a crystal, and a second light hole connected to the crystal cavity is opened at both ends of the carrier. The second light hole is coaxially arranged with the first light hole. The cover plate is arranged on the crystal cavity, the pressure block is located between the cover plate and the carrier, and the pressure block at least partially extends into the crystal cavity and abuts against the crystal. The elastic member is arranged between the cover plate and the pressure block.

[0010] In an embodiment, the cavity bottom of the crystal cavity is provided with a first fixing groove, the first fixing groove comprises a first groove bottom and two first groove walls, a first arc-shaped groove is formed in the middle of the first groove bottom along the extending direction thereof, the two first groove walls are symmetrically arranged with respect to the first arc-shaped groove, and the first groove walls are inclined towards the center of the first arc-shaped groove.

[0011] The second fixing groove comprises a second groove bottom and two second groove walls, a second arc-shaped groove is formed in the middle of the second groove bottom along the extending direction thereof, the two second groove walls are symmetrically arranged with respect to the second arc-shaped groove, and the second groove walls are inclined towards the center of the second arc-shaped groove.

[0012] In an embodiment, the surface of the pressing block away from the carrier is provided with a mounting groove, the elastic member is mounted in the mounting groove, and the elastic member partially extends out of the mounting groove and abuts against the cover plate.

[0013] In an embodiment, the width of the pressing block and the width of the crystal cavity satisfy the following relationship: 0.5mm≤D2-D1≤1mm; wherein D1 is the width of the pressing block, and D2 is the width of the crystal cavity.

[0014] In an embodiment, the fixing assembly further comprises a limiting piece, one end of the carrier away from the furnace is provided with a limiting portion in the circumferential direction, and the other end is provided with a connecting portion, the limiting piece is provided with a through hole communicating with the heating cavity, and the through hole is opposite to the first light hole; wherein, when the carrier is placed in the heating cavity, the connecting portion is located in the heating cavity and connected with the limiting piece, the limiting piece is located outside one end of the furnace, and the limiting portion abuts against the end face of the other end of the furnace.

[0015] In an embodiment, the bottom of the heating cavity is provided with a first guide surface, and the lower surface of the carrier is provided with a second guide surface matched with the first guide surface.

[0016] In an embodiment, the two opposite ends of the furnace are provided with annular portions in the circumferential direction, and the mounting space is defined between the two annular portions, the heating member is arranged around the outer circumferential surface of the furnace, and the end portion of the heating member abuts against the annular portion.

[0017] In an embodiment, two window piece assemblies are further included, and the two window piece assemblies are respectively connected to the two annular portions.

[0018] The window piece assembly includes an outer end cover, an inner end cover, and a window piece located between the outer end cover and the inner end cover. The surface of the inner end cover facing the outer end cover is provided with a placement groove. The outer end cover is connected to the inner end cover so that the window piece is accommodated in the placement groove. The outer end cover and the inner end cover are provided with a coaxially arranged third light hole, and the third light hole is opposite to the first light hole.

[0019] In one embodiment, a thermocouple is further included. A receiving groove is provided on the outer peripheral surface of the furnace. The thermocouple is installed in the receiving groove, and the pins of the thermocouple extend out of the receiving groove for connection with the wiring terminal.

[0020] In one embodiment, two heat-insulating covers are further included, and the two heat-insulating covers are respectively covered at both ends of the accommodating cavity, and a fourth light hole is opened on the heat-insulating cover and is opposite to the first light hole.

[0021] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0022] By using the cover plate to apply pressure to the elastic member to generate elastic force, the pressure block is driven to at least partially extend into the crystal cavity and abut against the crystal, so that the bottom of the crystal is tightly fitted with the cavity wall of the crystal cavity to complete the installation of the crystal in the carrier. After that, the entire fixed assembly is loaded into the heating cavity of the furnace. Finally, the furnace is loaded into the accommodating cavity of the shell, and the accommodating cavity is covered with two heat-insulating covers to form a heat-insulating space, which reduces the exchange of the ambient temperature of the crystal with the outside world. The temperature loss is small, and it can ensure that the appropriate temperature required by the crystal is quickly reached and stabilized, ensuring that the laser outputs high-efficiency and high-stability frequency-doubled laser. If different types of crystals are required, it is only necessary to replace the matching carrier, pressure block and cover plate, without replacing the entire temperature-controlled furnace, so that it can adapt to crystals produced by different manufacturers, improve compatibility, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] In the attached figure:

[0026] Figure 1This is a schematic structural diagram of a temperature-controlled furnace in the present application;

[0027] Figure 2 This is a schematic diagram of an explosion of a temperature-controlled furnace of the present application;

[0028] Figure 3 This is a schematic structural diagram of a fixed component in a temperature-controlled furnace of the present application;

[0029] Figure 4 This is an exploded schematic diagram of a fixed component in a temperature-controlled furnace of the present application;

[0030] Figure 5 This is a schematic diagram of the structure of a temperature-controlled furnace in the present application after a crystal is loaded into a fixed assembly;

[0031] Figure 6 This is a schematic structural diagram of a carrier in a temperature-controlled furnace of the present application;

[0032] Figure 7 This is a schematic diagram of the structure of a briquette in a temperature-controlled furnace of the present application;

[0033] Figure 8 This is a schematic structural diagram of a heating component in a temperature-controlled furnace of the present application;

[0034] Figure 9 This is a structural schematic diagram of a shell, a heat-insulating cover and a heat-insulating sleeve in a temperature-controlled furnace of the present application.

[0035] Figure Number:

[0036] 10. Housing; 10a. First optical aperture; 20. Sealing cover; 20a. Opening; 30. Insulation sleeve; 40. Fixing assembly; 41. Carrying member; 41a. Crystal cavity; 41b. Second optical aperture; 411. First fixing groove; 411a. First groove wall; 412. First arcuate groove; 42. Cover plate; 43. Press block; 431. Second fixing groove; 431a. Second groove wall; 432. Mounting groove; 433. Second arcuate groove; 44. Elastic member; 45. Limiting piece; 45a. Through hole; 50. Heating assembly; 51. Furnace; 51a. Ring portion; 51b. Accommodating groove; 51c. Heating chamber; 52. Heating element; 60. Window piece assembly; 61. Outer end cover; 62. Inner end cover; 62a. Placement groove; 63. Window piece; 64. Third optical hole; 70. Insulating cover; 70a. Fourth optical hole; 80. Thermocouple; 90. Crystal; 100. Sealing ring; A. Installation space; B. Accommodating chamber. DETAILED DESCRIPTION

[0037] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0038] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0039] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0040] Figure 1 This is a schematic structural diagram of a temperature-controlled furnace in the present application; Figure 2 This is a schematic diagram of the explosion of a temperature-controlled furnace in this application. Figure 1 and Figure 2The present application provides a temperature-controlled furnace, which includes a shell 10, a heating component 50, and a fixing component 40. The shell 10 has a receiving cavity B, which is surrounded by a thermal insulation sleeve 30. Thermal insulation covers 70 are connected to opposite ends of the shell 10. The thermal insulation sleeve 30 and the two thermal insulation covers 70 form an insulating space inside the shell 10. When the heating component 50 and the fixing component 40 are subsequently placed in the receiving cavity B, the thermal insulation sleeve 30 and the thermal insulation cover 70 can block heat convection and heat radiation, reducing the exchange of the ambient temperature of the crystal 90 with the outside world. The temperature loss is small, and the temperature can be quickly reached and stabilized at the appropriate temperature required by the crystal 90, ensuring that the laser outputs high-efficiency and high-stability frequency-doubled laser light. In addition, because the thermal insulation sleeve 30 and the thermal insulation cover 70 are used to block the heat in the receiving cavity B from diffusing out of the shell 10, the thermal insulation sleeve 30 and the thermal insulation cover 70 must have low thermal conductivity, high temperature resistance, and high thermal insulation efficiency.

[0041] The heating assembly 50 is used to generate heat to ensure that the temperature within the accommodating chamber B is maintained within a specific range, ensuring that the temperature within the accommodating chamber B is stabilized to a suitable temperature value for the crystal 90. Specifically, the heating assembly 50 includes a furnace 51 and a heating element 52. The furnace 51 is disposed within the accommodating chamber B and has a heating cavity 51c extending through both ends thereof. The heating element 52 surrounds the outer circumference of the furnace 51 to generate heat that is transferred to the heating cavity 51c. The fixing assembly 40 is disposed within the heating cavity 51c, and the outer circumference of the fixing assembly 40 contacts the cavity wall of the heating cavity 51c. That is to say, by surrounding the heating element 52 on the outer surface of the furnace 51, the heating element 52 can be used to generate heat and transfer it to the outer surface of the furnace 51, thereby rapidly increasing the temperature of the heating chamber 51c of the furnace 51. Since the fixing component 40 is placed in the heating chamber 51c, and the outer surface of the fixing component 40 is in contact with the cavity wall of the heating chamber 51c, the heat is transferred to the fixing component 40, and then the fixing component 40 transfers the heat to the crystal 90 housed in the fixing component 40, thereby achieving precise temperature control of the crystal 90.

[0042] It should be noted that the heating element 52 in this embodiment is used to generate heat. For this purpose, the heating element 52 can be a heating resistance wire or a component that can generate heat in existing technology, and there is no limitation on this.

[0043] Figure 3 This is a schematic structural diagram of a fixing assembly 40 in a temperature-controlled furnace of the present application; Figure 4 This is an exploded schematic diagram of a fixed component 40 in a temperature-controlled furnace of the present application. Figure 3 and Figure 4The fixing assembly 40 comprises a carrier 41, a cover plate 42, a pressing block 43 and an elastic member 44. The carrier 41 has a crystal cavity 41a penetrating through the top of the carrier 41 and used for accommodating the crystal 90. The cover plate 42 covers the crystal cavity 41a. The pressing block 43 is located between the cover plate 42 and the carrier 41, and at least partially extends into the crystal cavity 41a and abuts against the crystal 90. The elastic member 44 is arranged between the cover plate 42 and the pressing block 43. When the crystal 90 is packaged, the crystal 90 is first placed into the crystal cavity 41a, and at this time, the outer circumferential surface of the crystal 90 is in contact with the crystal cavity 41a, thereby forming a preliminary radial positioning and avoiding the crystal 90 from shaking greatly in the horizontal direction. Then, at least part of the pressing block 43 extends into the crystal cavity 41a and abuts against the crystal 90. Then, the crystal cavity 41a is covered by the cover plate 42, and a certain downward pressure is applied to the cover plate 42, so that the cover plate 42 moves towards the pressing block 43. Then, the elastic member 44 applies a continuous pressure to the crystal 90 through the pressing block 43, so that the lower end surface of the crystal 90 is tightly attached to the bottom of the crystal cavity 41a, thereby limiting the displacement of the crystal 90 in the vertical direction. Thus, the crystal 90 is fixedly installed in the carrier 41, so as to be subsequently installed in the heating cavity 51c. When the crystal 90 needs to be taken out and replaced, the fixing assembly 40 is first taken out from the heating cavity 51c, and then the cover plate 42 is removed. At this time, the elastic member 44 recovers along the direction of its deformation due to the loss of the extrusion of the cover plate 42, so that the pushing force of the elastic member 44 to the pressing block 43 disappears, and the pressing block 43 moves upwards and gradually separates from the crystal 90. After the crystal 90 is only in the crystal cavity 41a of the carrier 41 without axial pressure constraint, the crystal 90 can be taken out upwards by clamping or suction.

[0044] That is, the fixing assembly 40 of the present application ingeniously arranges the elastic member 44 between the cover plate 42 and the pressing block 43, so as to apply an extrusion to the elastic member 44 by the cover plate 42 to generate an elastic force, and then drive the pressing block 43 to at least partially extend into the crystal cavity 41a and abut against the crystal 90, so that the bottom of the crystal 90 is tightly attached to the cavity wall of the crystal cavity 41a, thereby forming an axial constraint. At the same time, the outer circumferential surface of the crystal 90 is in contact with the inner wall of the crystal cavity 41a, thereby forming a radial constraint. Thus, under the double constraints, the crystal 90 will not displace or shake in the heating or vibration environment, thereby providing a structural basis for the efficient action of the laser and the crystal 90, and reducing the problem of laser energy loss or unstable output caused by the shaking of the crystal 90.

[0045] In addition, the elastic member 44 can be a spring, so that when there is vibration or temperature change in the external environment, the spring can absorb stress by its deformation, thereby avoiding the instantaneous impact force of rigid contact and effectively reducing the rupture, edge collapse and the like of the crystal 90 caused by excessive fixing pressure or stress concentration, thereby protecting the optical performance of the crystal 90. The above elastic member 44 is a spring only as an example, but is not limited thereto.

[0046] To sum up, the temperature-controlled furnace of the present application generates elastic force by using the cover plate 42 to squeeze the elastic member 44, thereby driving the pressure block 43 to at least partially extend into the crystal cavity 41a and abut against the crystal 90, so that the bottom of the crystal 90 is tightly fitted with the cavity wall of the crystal cavity 41a to complete the installation of the crystal 90 in the carrier part, and then the entire fixing assembly 40 is loaded into the heating cavity 51c of the furnace chamber 51, and finally the furnace chamber 51 is loaded into the accommodating cavity B of the shell 10, and the accommodating cavity B is covered with two heat-insulating covers 70 to form an insulation space, reduce the exchange of the ambient temperature of the crystal 90 with the outside world, and reduce the temperature loss. It can ensure that the appropriate temperature required by the crystal 90 is quickly reached and stabilized, ensuring that the laser outputs high-efficiency and high-stability frequency-doubled laser. If different types of crystals 90 are required, it is only necessary to replace the corresponding carrier 41, pressure block 43 and cover plate 42 without replacing the entire temperature control furnace. This enables adaptation to crystals 90 produced by different manufacturers, improves compatibility and reduces production costs.

[0047] Specifically, a first light hole 10a is defined at one end of the housing 10, communicating with the accommodating cavity B. Second light holes 41b are defined at both ends of the carrier 41, communicating with the crystal cavity 41a. The second light hole 41b is coaxial with the first light hole 10a. Furthermore, a fourth light hole 70a is defined on the thermal insulation cover, directly opposite the first light hole 10a. That is, after the carrier 41 is inserted into the heating cavity 51c and the furnace 51 is inserted into the accommodating cavity B, the second light hole 41b is aligned with the first light hole 10a. Laser energy can then sequentially pass through the first and second light holes 10a, 41b, into the crystal 90, and then exit from the other side after being acted upon by the crystal 90. This minimizes energy loss during laser transmission, ensures sufficient laser energy enters the crystal 90, and provides the optical path foundation for the laser to output high-efficiency frequency-doubled laser light. If the first light hole 10a and the second light hole 41b are not coaxial, the laser light will collide with or reflect from the hole walls as it passes through the light holes, resulting in some energy loss.

[0048] Figure 5 This is a schematic structural diagram of a temperature-controlled furnace of the present application after a crystal 90 is loaded into a fixing assembly 40; Figure 6 This is a schematic structural diagram of a carrier 41 in a temperature-controlled furnace of the present application; Figure 7 This is a schematic diagram of the structure of a pressure block 43 in a temperature-controlled furnace of this application. Please refer to Figures 5 to 7In one embodiment, a first fixing groove 411 is provided at the bottom of the crystal cavity 41a. The first fixing groove 411 includes a first groove bottom and two first groove walls 411a. A first arcuate groove 412 is defined in the middle of the first groove bottom along its extension direction. The two first groove walls 411a are symmetrically arranged about the first arcuate groove 412, and the first groove walls 411a are inclined toward the center of the first arcuate groove 412. Correspondingly, a second fixing groove 431 is defined on the side of the pressing block 43 that contacts the crystal 90. The second fixing groove 431 includes a second groove bottom and two second groove walls 431a. A second arcuate groove 433 is defined in the middle of the second groove bottom along its extension direction. The two second groove walls 431a are symmetrically arranged about the second arcuate groove 433, and the second groove walls 431a are inclined toward the center of the second arcuate groove 433.

[0049] That is to say, the first groove wall 411a is inclined toward the center of the first arc groove 412, and the two second groove walls 431a are inclined toward the center of the second arc groove 433. When the pressure block 43 presses down the crystal 90 under the action of the elastic member 44, the inclined groove wall will generate lateral extrusion force on both sides of the crystal 90, and the curved surfaces of the first arc groove 412 and the second arc groove 433 can form a fitting contact with the outer peripheral surface of the crystal 90. At this time, the edges of the crystal 90 are located in the first arc groove 412 and the second arc groove 433, so as to disperse the axial pressure to multiple points on the outer peripheral surface of the crystal 90, thereby effectively reducing the risk of breakage of the crystal 90 due to pressure concentration and extending the service life of the crystal 90.

[0050] In one embodiment, a mounting groove 432 is provided on the surface of the pressing block 43 facing away from the carrier 41, and the elastic member 44 is installed in the mounting groove 432, with a portion of the elastic member 44 extending outside the mounting groove 432 to abut against the cover plate 42. Thus, by providing the mounting groove 432 on the surface of the pressing block 43 facing away from the carrier 41 and installing the elastic member 44 in the mounting groove 432, the cavity wall of the mounting groove 432 can form a circumferential constraint on the elastic member 44, thereby ensuring that the elastic force of the elastic member 44 is precisely directed toward the center of the crystal 90, evenly distributing the pressure of the pressing block 43 on the crystal 90, improving the stability of the fixation of the crystal 90, and preventing damage to the crystal 90 due to excessive local force.

[0051] In one embodiment, the width of the pressing block 43 and the width of the crystal cavity 41a satisfy the following relationship: 0.5 mm ≤ D2 - D1 ≤ 1 mm, where D1 is the width of the pressing block 43 and D2 is the width of the crystal cavity 41a. In other words, limiting the width of the pressing block 43 to the width of the crystal cavity 41a to this relationship is intended to prevent the crystal 90 from becoming stuck in the crystal cavity 41a due to thermal expansion and contraction. This ensures that the pressure of the elastic member 44 is continuously and stably transmitted to the crystal 90 during temperature control, thereby preventing shaking of the crystal 90 that could lead to laser energy loss or unstable output. For example, if the difference between the width of the pressing block 43 and the width of the crystal cavity 41a is less than 0.5 mm, the thermal expansion will be completely offset, and even interference may occur at extreme temperatures, causing the pressing block 43 to be stuck in the crystal cavity 41a and unable to move to compensate for the thermal expansion and contraction of the crystal 90. If the difference between the width of the pressing block 43 and the width of the crystal cavity 41a is greater than 1 mm, the gap will still be large after thermal expansion. Although jamming will not occur, the excessively large gap will aggravate the shaking of the pressing block 43 at high temperatures.

[0052] In one embodiment, the fixing assembly 40 further includes a stopper 45. The end of the carrier 41 facing away from the furnace 51 has a circumferential stopper, and the other end has a connecting portion. The stopper 45 defines a through hole 45a that communicates with the heating chamber 51c. The through hole 45a is aligned with the first optical aperture 10a. When the carrier 41 is placed within the heating chamber 51c, the connecting portion is located within the heating chamber 51c and connected to the stopper 45. The stopper 45 is located outside one end of the furnace 51, and the stopper abuts against the end surface of the other end of the furnace 51.

[0053] Exemplarily, by respectively providing a limiting portion and a connecting portion at both ends of the carrier 41, after the carrier 41 is placed in the heating chamber 51c, the connecting portion extends into the heating chamber 51c and is connected to the connecting piece located on the outside of the furnace 51, and then cooperates with the limiting portion to abut the end face of the furnace 51 to form a bidirectional axial constraint, thereby strictly limiting the axial position of the carrier 41 in the heating chamber 51c, ensuring stable contact with the furnace 51, and avoiding axial movement of the carrier 41 in the heating chamber 51c due to vibration or thermal expansion.

[0054] In one embodiment, the bottom of the heating chamber 51c has a first guide surface, and the lower surface of the carrier 41 is provided with a second guide surface that matches the first guide surface. Thus, when loading the carrier 41 into the heating chamber 51c, the operator does not need to precisely position the carrier 41 within the heating chamber 51c. Instead, the operator simply needs to roughly place the carrier 41 within the heating chamber 51c. The first and second guide surfaces will then naturally align and guide the carrier 41 into the heating chamber 51c, thereby completing the loading of the carrier 41 into the heating chamber 51c. This simplifies the assembly process, reduces reliance on operator skill, improves production efficiency, and reduces product defect rates due to improper assembly.

[0055] Figure 8 This is a schematic diagram of the structure of a heating component 50 in a temperature-controlled furnace of the present invention. Figure 8 In one embodiment, annular portions 51a are circumferentially provided at opposite ends of the furnace 51. The two annular portions 51a define an installation space A between them. The heating element 52 surrounds the outer circumference of the furnace 51, with the ends of the heating element 52 abutting against the annular portions 51a. In other words, the two annular portions 51a are provided at opposite ends of the furnace 51, so that when the heating element 52 surrounds the outer circumference of the furnace 51, the ends of the heating element 52 are restrained by the two annular portions 51a, preventing axial slippage caused by vibration, which could result in uneven contact area between the heating element 52 and the furnace 51, and thus uneven heating.

[0056] In addition, in order to ensure the sealing of the furnace 51 after it is installed in the accommodating chamber B, sealing rings 100 are installed on both end surfaces of the furnace 51 to enhance its sealing performance.

[0057] Please refer to Figure 2 In one embodiment, the device further includes two window assemblies 60, each of which is connected to the two annular portions 51a. The window assembly 60 includes an outer end cap 61, an inner end cap 62, and a window 63 positioned between the outer and inner end caps 61 and 62. A placement groove 62a is defined on the surface of the inner end cap 62 facing the outer end cap 61. The outer end cap 61 is connected to the inner end cap 62 so that the window 63 is received within the placement groove 62a. A coaxial third light hole 64 is defined on the outer and inner end caps 61 and 62, and is aligned with the first light hole 10a.

[0058] For example, by forming a placement groove 62a in the inner end cap 62, the window piece 63 can be accommodated in the placement groove 62a. After the outer end cap 61 is connected to the inner end cap 62 (such as by bolting), axial pressure is generated on the window piece 63, so that the edge of the window piece 63 is tightly fitted with the placement groove 62a, thereby forming a whole and then connected to the annular portion 51a. In addition, connecting the window piece assembly 60 to the annular portion 51a not only effectively blocks external dust, water vapor and other pollutants from entering the heating chamber 51c, thereby protecting the cleanliness of core components such as the crystal 90 and the heating element 52, but also ensures that the optical path of the laser is continuous and without deviation when entering and exiting the heating chamber 51c, thereby minimizing transmission loss and providing optical path terminal protection for the laser to output high-efficiency frequency-doubled laser light.

[0059] In one embodiment, a thermocouple 80 is further included, and a receiving groove 51b is provided on the outer peripheral surface of the furnace 51. The thermocouple 80 is installed in the receiving groove 51b, and the pin of the thermocouple 80 extends outside the receiving groove 51b for connection to the terminal. In this way, the temperature of the furnace 51 can be fed back to the temperature control system (such as a PID controller) by using the thermocouple 80 to form a closed-loop control of detection-comparison-adjustment, thereby ensuring that the temperature of the crystal 90 is stable at the target value, providing core temperature control protection for the laser with stable output frequency of the laser. In addition, when assembling the thermocouple 80, the operator does not need to repeatedly calibrate the position of the thermocouple 80 (such as measuring the distance from the heating element 52). It is only necessary to embed the thermocouple 80 into the receiving groove 51b to ensure its fit with the furnace 51 and the consistency of the detection position, shorten the assembly time of the thermocouple 80, and reduce manual operation errors.

[0060] Figure 9 This is a schematic diagram of the structure of the shell 10, the heat insulation cover 70 and the heat insulation sleeve 30 in a temperature control furnace of the present invention. Figure 9 In one embodiment, a sealing cover 20 is further included. The sealing cover 20 is used to seal the port of the housing 10 that is not provided with the first optical aperture 10a. The sealing cover 20 is provided with an opening 20a that is aligned with the first optical aperture 10a to allow laser light to be emitted or injected. Thus, the provision of the sealing cover 20 effectively prevents external impurities from entering the accommodating chamber B, thereby protecting the cleanliness of core components such as the crystal 90 and the heater 52.

[0061] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A temperature controlled furnace, characterized in that: include: A housing having a housing cavity surrounded by a heat-insulating sleeve, and a first light hole communicating with the housing cavity is opened at one end of the housing; A heating assembly comprising a furnace and a heating element, wherein the furnace is disposed in the accommodating cavity and has a heating cavity extending through both ends thereof, and the heating element surrounds the outer circumference of the furnace to generate heat and transfer it to the heating cavity; a fixing assembly placed in the heating chamber, wherein an outer peripheral surface of the fixing assembly contacts a cavity wall of the heating chamber; In which, the fixing assembly includes a carrier, a cover plate, a pressure block and an elastic member. The carrier has a crystal cavity that passes through its top and is used to accommodate a crystal, and a second light hole connected to the crystal cavity is opened at both ends of the carrier. The second light hole is coaxially arranged with the first light hole. The cover plate is arranged on the crystal cavity, the pressure block is located between the cover plate and the carrier, and the pressure block at least partially extends into the crystal cavity and abuts against the crystal. The elastic member is arranged between the cover plate and the pressure block.

2. The temperature-controlled furnace according to claim 1, characterized in that: The bottom of the crystal cavity is provided with a first fixing groove, the first fixing groove comprising a first groove bottom and two first groove walls, a first arc-shaped groove is formed in the middle of the first groove bottom along its extension direction, the two first groove walls are symmetrically arranged around the first arc-shaped groove, and the first groove walls are inclined toward the center of the first arc-shaped groove; A second fixing groove is provided on one side of the pressing block for contacting the crystal, the second fixing groove includes a second groove bottom and two second groove walls, a second arc-shaped groove is provided in the middle of the second groove bottom along its extension direction, the two second groove walls are symmetrically arranged around the second arc-shaped groove, and the second groove walls are inclined toward the center of the second arc-shaped groove.

3. The temperature controlled furnace according to claim 2, characterized in that: A mounting groove is provided on the surface of the pressing block facing away from the bearing member. The elastic member is installed in the mounting groove, and a portion of the elastic member extends out of the mounting groove and abuts against the cover plate.

4. The temperature-controlled furnace according to claim 1, characterized in that: The width of the pressing block and the width of the crystal cavity satisfy the following relationship: 0.5 mm ≤ D2 - D1 ≤ 1 mm; wherein D1 is the width of the pressing block, and D2 is the width of the crystal cavity.

5. The temperature-controlled furnace according to claim 2, characterized in that: The fixing assembly also includes a limiting plate, the end of the carrier away from the furnace has a limiting portion along the circumferential direction, and the other end has a connecting portion, the limiting plate is provided with a through hole connected to the heating chamber, and the through hole is opposite to the first light hole; wherein, when the carrier is placed in the heating chamber, the connecting portion is located in the heating chamber and is connected to the limiting plate, the limiting plate is located on the outside of one end of the furnace, and the limiting portion abuts against the end face of the other end of the furnace.

6. The temperature-controlled furnace according to claim 5, characterized in that: The bottom of the heating chamber is provided with a first guide surface, and the lower surface of the supporting member is provided with a second guide surface matched with the first guide surface.

7. The temperature-controlled furnace according to claim 1, characterized in that: An annular portion is provided at opposite ends of the furnace along the circumferential direction, and an installation space is defined between the two annular portions. The heating element surrounds the outer circumference of the furnace, and the end of the heating element abuts against the annular portion.

8. The temperature-controlled furnace according to claim 7, characterized in that: It also includes two window sheet assemblies, wherein the two window sheet assemblies are respectively connected to the two annular portions; The window piece assembly includes an outer end cover, an inner end cover, and a window piece located between the outer end cover and the inner end cover. The surface of the inner end cover facing the outer end cover is provided with a placement groove. The outer end cover is connected to the inner end cover so that the window piece is accommodated in the placement groove. The outer end cover and the inner end cover are provided with a coaxially arranged third light hole, and the third light hole is opposite to the first light hole.

9. The temperature-controlled furnace according to claim 1, characterized in that: A thermocouple is also included. A receiving groove is provided on the outer peripheral surface of the furnace. The thermocouple is installed in the receiving groove, and the pins of the thermocouple extend out of the receiving groove for connection with the wiring terminal.

10. The temperature-controlled furnace according to claim 1, characterized in that: The invention also includes two heat-insulating covers, which are respectively covered at both ends of the accommodating cavity, and a fourth light hole is opened on the heat-insulating cover and is directly opposite to the first light hole.

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