A garnet crystal growth apparatus

Abstract

The application discloses a garnet crystal growth device, which comprises a crucible, a central shaft, a clamp and a substrate, a molten liquid is arranged in the crucible, the lower end of the central shaft is connected with the clamp, the clamp holds the substrate, the substrate rotates on the upper surface of the molten liquid, a first cover plate is arranged on the mouth of the crucible, a first through hole is arranged in the center of the first cover plate, and the central shaft is arranged through the first through hole; a first baffle is connected with the central shaft, and the first baffle covers the first through hole. Compared with the prior art, the application has the beneficial effects that: the first cover plate is arranged on the mouth of the crucible, the first through hole is arranged in the center of the first cover plate, and the central shaft is arranged through the first through hole; the gas flow towards the inside of the crucible is prevented. The first baffle is connected with the central shaft, and the first baffle covers the first through hole. The gas flow through the first through hole is further prevented. The temperature distribution field in the inside of the crucible is avoided from being disturbed.

Description

Technical Field

[0001] This invention relates to a garnet crystal growth apparatus, and more particularly to its windproof structure, belonging to the field of garnet crystal growth technology. Background Technology

[0002] Garnet crystal is a widely used solid-state laser working medium material, extensively applied in the fabrication of optical components such as lasers. Generally, its production method involves melting raw materials in a crucible, with the molten liquid contacting a substrate to form a crystalline layer. The operating temperature is approximately 700-800 degrees Celsius. By controlling the temperature gradient between the molten raw material and the surrounding gas, a suitable spatial temperature distribution field is constructed, causing the melt to undergo directional solidification and crystallization to obtain garnet crystals. However, due to the high temperature of the crucible, surrounding gas enters the crucible through the opening, interfering with the temperature distribution field. Therefore, how to prevent gas flow and avoid interference with the temperature distribution field is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] To overcome the above-mentioned drawbacks, the present invention aims to provide a garnet crystal growth apparatus that slows down gas flow and avoids interfering with the temperature distribution field inside the crucible.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a garnet crystal growth apparatus, comprising a crucible, a central shaft, a clamp, and a substrate. The crucible contains molten liquid, the lower end of the central shaft is connected to the clamp, the clamp holds the substrate, the substrate rotates on the upper surface of the molten liquid, a first cover plate is provided on the mouth of the crucible, a first through hole is provided in the center of the first cover plate, and the central shaft is disposed through the first through hole; a first baffle is connected to the central shaft, and the first baffle covers the first through hole.

[0005] The present invention is further configured such that: the first baffle is a pair, respectively disposed on both sides of the first cover plate.

[0006] The present invention is further configured such that: a second cover plate is provided on the first cover plate, and a skirt is provided on the side of the second cover plate, the second cover plate, the first cover plate and the skirt together form a buffer cavity; a second through hole is provided in the center of the second cover plate, and the central shaft is provided through the second through hole; a second retaining ring is connected to the central shaft, and the second retaining ring covers the second through hole.

[0007] A further feature of the present invention is that the second retaining ring is a pair, respectively disposed on both sides of the second cover plate.

[0008] A further feature of the present invention is that a limiting ring is connected to the edge of the first cover plate, and the outer wall of the crucible and the outer wall of the skirt abut against the inner wall of the limiting ring.

[0009] A further feature of the present invention is that a ring seat is provided on the surface of the first baffle, the first baffle and the ring seat are integrally formed, and a bolt is provided through the ring seat and the central shaft.

[0010] The present invention is further configured such that: a first annular cover and a second annular cover are provided between the second retaining ring and the second cover plate, the middle part of the first annular cover and the second annular cover are arc surfaces, the two sides are horizontal annular surfaces, the edge of the first annular cover and the edge of the second annular cover are mutually juxtaposed, and the other edge of the first annular cover and the other edge of the second annular cover are respectively slidably connected to the second retaining ring and the second cover plate.

[0011] The invention is further configured such that: hooks are provided on the first annular cover and the second annular cover, and the edges of the hooks are provided with first rolled edges, and the pair of hooks are mutually yoke.

[0012] The invention is further configured such that: the second retaining ring and the second cover plate are provided with mounting grooves, and the other edge of the first annular cover and the second annular cover is provided with a second rolled edge, which slides in the mounting groove; the width of the mounting groove is smaller than the diameter of the second rolled edge.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: By covering the mouth of the crucible with a first cover plate, and having a first through hole in the center of the first cover plate, through which the central shaft is disposed, gas flow towards the interior of the crucible is prevented. Furthermore, by connecting a first baffle plate to the central shaft, the first baffle plate covers the first through hole, further blocking the airflow through the first through hole and preventing interference with the temperature distribution field inside the crucible. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the garnet crystal growth apparatus shown in Example 1; Figure 2 This is a schematic diagram of the structure of the second cover plate and the second retaining ring; Figure 3 for Figure 2 A partial structural diagram of the middle circle A; Figure 4 A schematic diagram of the interlocking structure of the first and second annular covers; Figure 5 for Figure 3 A schematic diagram of a partial structure of the middle circle B.

[0015] In the figure: 1. Crucible; 2. Fixture; 3. Substrate; 4. Molten metal; 5. Central shaft; 6. First cover plate; 7. First through hole; 8. First baffle; 9. Limiting ring; 10. Second cover plate; 11. Second retaining ring; 12. First annular cover; 13. Hook; 14. First rolled edge; 15. Mounting groove; 16. Ring seat; 17. Bolt; 18. Buffer cavity; 19. Skirt; 20. Second through hole; 21. Second annular cover; 22. Second rolled edge. Detailed Implementation

[0016] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention. Example 1:

[0017] See Figure 1 As shown, a garnet crystal growth apparatus in this embodiment includes a crucible 1, a central shaft 5, a clamp 2, and a substrate 3. Molten liquid 4 is disposed in the crucible 1. The lower end of the central shaft 5 is connected to the clamp 2, which holds the substrate 3. The substrate 3 rotates on the upper surface of the molten liquid 4. A first cover plate 6 covers the opening of the crucible 1. A first through hole 7 is provided in the center of the first cover plate 6, through which the central shaft 5 passes. A first baffle 8 is connected to the central shaft 5, covering the first through hole 7. There is a pair of first baffles 8, respectively disposed on both sides of the first cover plate 6. A second cover plate 10 is provided on the first cover plate 6. A skirt 19 is provided on the side of the second cover plate 10. The second cover plate 10, the first cover plate 6, and the skirt 19 together form a buffer cavity 18. A second through hole 20 is provided in the center of the second cover plate 10, through which the central shaft 5 is inserted. A second retaining ring 11 is connected to the central shaft 5, covering the second through hole 20. There is a pair of second retaining rings 11, respectively located on both sides of the second cover plate 10. A limiting ring 9 is connected to the edge of the first cover plate 6. The outer wall of the crucible 1 and the outer wall of the skirt 19 abut against the inner wall of the limiting ring 9. A ring seat 16 is provided on the surface of the first baffle 8. The first baffle 8 and the ring seat 16 are integrally formed. A bolt 17 is provided through between the ring seat 16 and the central shaft 5.

[0018] In summary, the method of using the garnet crystal growth apparatus shown in Embodiment 1 is as follows: A first cover plate 6 is placed over the opening of the crucible 1, with a first through hole 7 in the center of the first cover plate 6, through which the central shaft 5 is inserted; this prevents gas from flowing into the crucible 1. A first baffle 8 is connected to the central shaft 5, covering the first through hole 7, further blocking the airflow through the first through hole 7 and preventing interference with the temperature distribution field inside the crucible 1. The second cover plate 10, the first cover plate 6, and the skirt 19 enclose a buffer cavity 18; the buffer cavity 18 not only buffers the airflow but also slows down the outward diffusion of heat from the crucible 1. The temperature of the buffer cavity 18 is lower than the temperature of the crucible 1 but higher than the temperature of the external gas, forming a temperature buffer layer. The second cover plate 10 and the second baffle ring 11 further block gas convection, maintaining a stable temperature distribution field inside the crucible 1. The ring seat 16, the first baffle 8, and the central shaft 5 are connected together by bolts 17 passing through the ring seat 16 and the central shaft 5. During use, the ring seat 16, the first baffle 8, the central shaft 5, the clamp 2, and the substrate 3 rotate together. As the garnet crystal grows, the thickness of the garnet crystal increases, and the central shaft 5 drives the ring seat 16, the first baffle 8, the first cover plate 6, the second cover plate 10, and the clamp 2 to move upward together. Example 2:

[0019] See Figure 1-5 As shown, Embodiment 2 is basically the same as Embodiment 1, except that: a first annular cover 12 and a second annular cover 21 are provided between the second retaining ring 11 and the second cover plate 10. The middle part of the first annular cover 12 and the second annular cover 21 is an arc surface, and the two sides are horizontal annular surfaces. The edge of the first annular cover 12 and the edge of the second annular cover 21 are interlocked. The other edge of the first annular cover 12 and the other edge of the second annular cover 21 are slidably connected to the second retaining ring 11 and the second cover plate 10, respectively. Hooks 13 are provided on the first annular cover 12 and the second annular cover 21. The edge of the hooks 13 is set as a first rolled edge 14, and a pair of hooks 13 are interlocked. Mounting grooves 15 are provided on the second retaining ring 11 and the second cover plate 10. The other edge of the first annular cover 12 and the second annular cover 21 is set as a second rolled edge 22, which slides in the mounting groove 15. The width of the groove opening of the mounting groove 15 is smaller than the diameter of the second rolled edge 22.

[0020] In Embodiment 1, a small amount of gas still passes through the gap between the second baffle ring 11 and the second cover plate 10, and through the second through hole 20, entering the buffer chamber 18. The technical problem to be solved in Embodiment 2 is: how to prevent gas from passing through the gap between the second baffle ring 11 and the second cover plate 10. The technical effect achieved by the embodiment is that by setting a first annular cover 12 and a second annular cover 21 between the second baffle ring 11 and the second cover plate 10, the gas is blocked by the first annular cover 12 and the second annular cover 21, reducing the flow rate. This further mitigates the impact on the temperature distribution field inside the crucible 1.

[0021] By providing the mounting groove 15 and the second rolled edge 22, the second rolled edge 22 slides within the mounting groove 15, achieving a rotatable connection between the second retaining ring 11 and the first annular cover 12, as well as between the second annular cover 21 and the second cover plate 10. This is achieved due to the interlocking of a pair of hooks 13.

[0022] The middle part of the first annular cover 12 and the second annular cover 21 is an arc surface, which is elastic. It can expand and contract slightly in the vertical direction. Since the two sides of the first annular cover 12 and the second annular cover 21 are horizontal annular surfaces, and hooks 13 are provided on the edges of the annular surfaces, and a pair of hooks 13 are interlocked, the first annular cover 12 and the second annular cover 21 can move relative to each other in the horizontal direction.

[0023] The edge of the hook portion 13 is provided with a first rolled edge 14. The diameter of the first rolled edge 14 is smaller than the size of the opening of the hook portion 13, which further prevents gas from passing between the hook portion 13 and the opening of the hook portion 13, thus reducing the gas flow rate. At the same time, the sum of the diameters of a pair of first rolled edges 14 is greater than the size of the opening of the hook portion 13. When a pair of first rolled edges 14 meet, they obstruct and lock each other, making them unable to separate.

[0024] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A garnet crystal growth apparatus, comprising a crucible (1), a central shaft (5), a clamp (2), and a substrate (3), wherein a molten liquid (4) is disposed in the crucible (1), the lower end of the central shaft (5) is connected to the clamp (2), the substrate (3) is held in the clamp (2), and the substrate (3) rotates on the upper surface of the molten liquid (4), characterized in that, The crucible (1) is covered with a first cover plate (6), and a first through hole (7) is provided in the center of the first cover plate (6). The central shaft (5) is provided through the first through hole (7). A first baffle (8) is connected to the central shaft (5), and the first baffle (8) covers the first through hole (7).

2. The garnet crystal growth apparatus according to claim 1, characterized in that, The first baffle (8) is a pair, respectively disposed on both sides of the first cover plate (6).

3. The garnet crystal growth apparatus according to claim 1, characterized in that, A second cover plate (10) is provided on the first cover plate (6), and a skirt (19) is provided on the side of the second cover plate (10). The second cover plate (10), the first cover plate (6) and the skirt (19) enclose to form a buffer cavity (18). A second through hole (20) is provided in the center of the second cover plate (10), and the central shaft (5) is provided through the second through hole (20). A second retaining ring (11) is connected on the central shaft (5), and the second retaining ring (11) covers the second through hole (20).

4. The garnet crystal growth apparatus according to claim 3, characterized in that, The second retaining ring (11) is a pair, which are respectively disposed on both sides of the second cover plate (10).

5. The garnet crystal growth apparatus according to claim 4, characterized in that, The edge of the first cover plate (6) is connected to a limiting ring (9), and the outer wall of the crucible (1), the outer wall of the skirt (19) and the inner wall of the limiting ring (9) are in contact and abut against each other.

6. The garnet crystal growth apparatus according to claim 1, characterized in that, A ring seat (16) is provided on the surface of the first baffle (8). The first baffle (8) and the ring seat (16) are integrally formed. A bolt (17) is provided through the ring seat (16) and the central shaft (5).

7. The garnet crystal growth apparatus according to claim 3, characterized in that, A first annular cover (12) and a second annular cover (21) are provided between the second retaining ring (11) and the second cover plate (10). The middle part of the first annular cover (12) and the second annular cover (21) are arc surfaces, and the two sides are horizontal annular surfaces. The edge of the first annular cover (12) and the edge of the second annular cover (21) are mutually juxtaposed. The other edge of the first annular cover (12) and the other edge of the second annular cover (21) are slidably connected to the second retaining ring (11) and the second cover plate (10), respectively.

8. The garnet crystal growth apparatus according to claim 7, characterized in that, The first annular cover (12) and the second annular cover (21) are provided with hooks (13), and the edges of the hooks (13) are provided with first rolled edges (14), and the pair of hooks (13) are mutually yoke.

9. The garnet crystal growth apparatus according to claim 8, characterized in that, The second retaining ring (11) and the second cover plate (10) are provided with mounting grooves (15), and the other edge of the first annular cover (12) and the second annular cover (21) is provided with a second rolled edge (22). The second rolled edge (22) slides in the mounting groove (15); the width of the groove of the mounting groove (15) is smaller than the diameter of the second rolled edge (22).

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