A water-cooled gain medium and a crystal fixture for suppressing lateral parasitic oscillation

Abstract

The present invention relates to the field of ultra-intense lasers, and in particular to a crystal fixture for suppressing transverse parasitic oscillations with a water-cooled gain medium. The crystal fixture of the present invention comprises a clamping body, on which a crystal mounting position for mounting an optical crystal is provided. A wrapping liquid cavity communicating with the crystal mounting position is provided on the outer side of the crystal mounting position. The wrapping liquid cavity has a drainage hole for discharging the wrapping liquid and a liquid inlet hole for injecting the wrapping liquid. The drainage hole and the liquid inlet hole are each provided with a corresponding plug. In addition to being provided with a crystal mounting position, the clamping body of the crystal fixture for suppressing transverse parasitic oscillations with a water-cooled gain medium is also provided with a wrapping liquid cavity on the outer side of the crystal mounting position. The wrapping liquid cavity and the crystal mounting position are interconnected. Therefore, when the wrapping liquid is injected into the wrapping liquid cavity through the liquid inlet hole, the wrapping liquid can assist in suppressing the parasitic oscillation, thereby solving the problem that parasitic oscillations of optical crystals are not easily suppressed.

Description

Technical Field

[0001] The present invention relates to the field of ultra-intense lasers, and in particular to a water-cooled gain medium and a crystal fixture for suppressing transverse parasitic oscillation. Background Art

[0002] With the development of laser technology and the continuous expansion of its application fields, special application fields have put forward higher requirements for the performance indicators of ultra-intense lasers, such as output energy, spot quality, and time contrast. The acquisition of ultra-intense lasers with high energy, high-quality spot, and high time contrast usually requires the use of larger-aperture gain media. For example, the output power of ultra-intense and ultra-short lasers reaches the PW level. For example, optical crystals are usually increased by increasing the optical aperture to meet the output energy requirements. Large-aperture gain media have parasitic oscillations and amplified spontaneous radiation, which will consume stored energy, limit output energy, affect the time contrast of the output laser pulse, and affect the beam quality due to thermal lensing.

[0003] Configuring an optical crystal with a coating liquid is an effective means of suppressing parasitic oscillations of the optical crystal. However, the coating liquid is chemically irritating to human skin, eyes, and respiratory tract, and is also corrosive to some materials. It is a volatile paste-like liquid in physical properties. Therefore, how to complete the design of the coating liquid cavity and replace the coating liquid without leakage is particularly important.

[0004] In addition, optical crystals tend to generate heat during operation, which, if not handled, can significantly affect the quality of the laser beam. When installing an optical crystal, its crystal axis azimuth needs to be determined. Being able to quickly adjust the crystal axis azimuth greatly facilitates the placement of the optical crystal. Summary of the Invention

[0005] The purpose of the present invention is to provide a water-cooled gain medium and a crystal fixture for suppressing lateral parasitic oscillations, so as to solve the problem that parasitic oscillations of optical crystals are difficult to suppress.

[0006] In order to solve the above problems, the water-cooled gain medium and the crystal fixture for suppressing lateral parasitic oscillations of the present invention adopt the following technical solution: the water-cooled gain medium and the crystal fixture for suppressing lateral parasitic oscillations include a clamp body, on which a crystal mounting position for mounting an optical crystal is provided, and an encapsulating liquid cavity communicating with the crystal mounting position is provided on the outer side of the crystal mounting position.

[0007] Beneficial effect: In addition to being provided with a crystal mounting position, the clamp body of the water-cooled gain medium and the crystal clamp for suppressing lateral parasitic oscillations of the present invention also has an encapsulating liquid cavity provided on the outside of the crystal mounting position. The encapsulating liquid cavity and the crystal mounting position are interconnected. Therefore, when the encapsulating liquid is injected into the encapsulating liquid cavity through the liquid inlet hole, the encapsulating liquid can assist in suppressing parasitic oscillations, thereby solving the problem that parasitic oscillations of optical crystals are not easy to suppress.

[0008] Furthermore, the wrapping liquid cavity is an annular cavity coaxial with the crystal mounting position. The coaxial arrangement of the wrapping liquid mounting cavity and the crystal mounting position can better achieve the wrapping effect on the optical crystal and better play the role of suppressing parasitic oscillation.

[0009] Furthermore, the width of the encapsulating liquid chamber in the direction of the optical crystal's thickness is slightly smaller than that of the crystal mounting position, thereby forming a limiting step at the boundary between the encapsulating liquid chamber and the crystal mounting position to limit the position of the optical crystal. The provision of the limiting step allows the crystal mounting position and the encapsulating liquid chamber to be structurally integrated, simplifying the structure of the present invention.

[0010] Furthermore, the clamping body includes a support portion and a cover, and the encapsulated liquid chamber and the crystal mounting position are both enclosed by the support portion and the cover. The crystal mounting position enclosed by the support portion and the cover further facilitates the installation of the optical crystal, for example, when installing the optical crystal from the side where the cover is located, it is more convenient to operate.

[0011] Furthermore, an annular groove surrounding the encapsulated liquid chamber is provided on the outer wall of the support portion adjacent to the cover. The cover seals the annular groove to form a circulating liquid cooling chamber. The circulating liquid cooling chamber can be used to cool the encapsulated liquid and the optical crystal and maintain a constant temperature, thereby ensuring the performance of the optical crystal. Furthermore, the circulating liquid cooling chamber formed by the cover and the annular groove has a simpler structure.

[0012] Furthermore, the outer layer of the wrapping liquid cavity is provided with a circulating liquid cooling cavity, which can be used to cool the wrapping liquid and the optical crystal and maintain a constant temperature, thereby ensuring the performance of the optical crystal.

[0013] Furthermore, the inner wall of the encapsulating liquid cavity is provided with a concave-convex structure to reduce the continuous reflection of the parasitic oscillation. By reducing the continuous reflection of the parasitic oscillation, the encapsulating liquid can help improve the parasitic oscillation suppression efficiency.

[0014] Furthermore, the concave-convex structure is a micro-groove structure.

[0015] Furthermore, the concave-convex structure is an asymmetric groove structure.

[0016] Furthermore, a drain hole is provided at the bottom of the sheathing liquid chamber, and a sealing valve is disposed in the drain hole, which can be opened by an inserted drain pipe. Providing the drain hole at the bottom of the sheathing liquid chamber facilitates the drainage of the sheathing liquid, and the sealing valve prevents leakage of the sheathing liquid, thereby ensuring the safety of the present invention.

[0017] Furthermore, the sealing valve is a needle valve.

[0018] Furthermore, the crystal fixture also includes a base for supporting the clamping body. An adjustment screw for adjusting the crystal axis azimuth of the optical crystal is disposed between the clamping body and the base. The adjustment screw can be used to flexibly adjust the clamping body's posture, thereby achieving the purpose of adjusting the crystal axis azimuth of the optical crystal, thus resolving the problem of inconvenient adjustment of the crystal axis azimuth of the optical crystal.

[0019] Furthermore, the clamp body is provided with an adjustment lug and mounted on the base via the adjustment lug seat. The adjustment screw is mounted on the adjustment lug and engages with the base support. The clamp body mounted on the base via the adjustment lug seat is more convenient to assemble, and the adjustment screw provided on the adjustment lug makes it easier to adjust the posture of the clamp body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a schematic structural diagram of the clamping body of Example 1 of the water-cooled gain medium and the crystal clamp for suppressing lateral parasitic oscillation of the present invention (working state);

[0021] Figure 2 1 is a schematic structural diagram of the clamping structure of Example 1 of the water-cooled gain medium and the crystal clamp for suppressing lateral parasitic oscillation of the present invention (in the state of replacing the encapsulating liquid);

[0022] Figure 3 1 is a schematic structural diagram of Example 1 of the water-cooled gain medium and the crystal fixture for suppressing lateral parasitic oscillations of the present invention;

[0023] Figure 4 It is a structural schematic diagram of an asymmetric groove.

[0024] In the figure: 1001, clamping body; 1002, base; 101, supporting part; 102, cover; 11, crystal mounting position; 12, wrapped liquid cavity; 13, asymmetric groove; 14, liquid inlet hole; 15, liquid discharge hole; 16, liquid discharge pipe; 17, sealing valve; 18, plug; 19, liquid inlet pipe; 20, circulating liquid cooling cavity; 21, liquid inlet; 22, liquid outlet; 23, adjusting screw; 24, adjusting ear plate. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0027] It should be noted that relational terms such as "first" and "second" that may appear are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or device. In the absence of further limitations, an element defined by a sentence such as "including a..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0028] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0029] Example 1 of the water-cooled gain medium and the crystal fixture for suppressing lateral parasitic oscillations of the present invention:

[0030] The water-cooled gain medium and the crystal fixture for suppressing transverse parasitic oscillation can be applied to the installation of optical crystals in laser devices.

[0031] like Figure 3 As shown, the crystal fixture for water-cooling the gain medium and suppressing lateral parasitic oscillation includes a fixture body 1001 and a base 1002 for mounting the fixture body.

[0032] The structure of the clamp body 1001 is as follows Figure 1 、 2As shown, its overall shape is roughly circular, and a crystal mounting position 11 is provided inside. The crystal mounting position 11 is used to install the optical crystal, and the optical crystal is limited and fixed from the outer edge of the optical crystal at the periphery. A wrapping liquid cavity 12 is provided on the outside of the crystal mounting position 11. The wrapping liquid cavity 12 and the crystal mounting position 11 are interconnected and used to contain a wrapping liquid to suppress parasitic oscillations of the optical crystal. In this embodiment, the wrapping liquid cavity 12 is an annular cavity, which surrounds the periphery of the crystal mounting position 11. In order to better assist the wrapping liquid in improving the parasitic oscillation suppression performance, a concave-convex structure is provided on the inner wall of the wrapping liquid cavity 12 to reduce the continuous reflection of the parasitic oscillation. In this embodiment, the concave-convex structure is a micro-groove structure, and is an asymmetric groove 13. The asymmetric groove 13 is as shown in FIG. Figure 4 As shown, the overall shape is sawtooth, the top angle is α, the back angle is β, and the tooth spacing is a double helix structure with unequal spacing between a and b. The double teeth have slightly different tooth top heights due to different pitches, which can reduce the occurrence of vibration.

[0033] In this embodiment, an annular groove is provided on the inner wall of the clamp body 1001, and the portion of the groove close to the notch (the portion close to the optical crystal) forms the crystal mounting position 11, and the portion close to the bottom of the groove forms a wrapping liquid cavity 12, wherein the width of the wrapping liquid cavity 12 on the square of the optical crystal thickness is slightly smaller than the crystal mounting position 11, thereby forming a limiting step for limiting the optical crystal at the boundary between the wrapping liquid cavity 12 and the crystal mounting position 11. Therefore, in this embodiment, the wrapping liquid cavity 12 is an annular cavity coaxial with the crystal mounting position 11.

[0034] To facilitate and safely inject and replace the coating liquid, the coating liquid chamber 12 is provided with an inlet hole 14 and a drain hole 15. To facilitate drainage of the coating liquid, in this embodiment, drain hole 15 is located at the bottom of the coating liquid chamber 12. Drain hole 15 is equipped with a sealing valve 17, which can be opened by inserting a drain tube 16. In this embodiment, sealing valve 17 is a needle valve. To prevent the coating liquid from evaporating and affecting the surrounding environment, both the inlet hole 14 and the drain hole 15 are equipped with a plug 18 and corresponding sealing rings. When the coating liquid needs to be injected, the plug at the inlet hole 14 can be opened and the liquid can be injected by inserting the inlet tube 19. When the wrapping liquid needs to be replaced, the plug at the liquid inlet and drain hole 15 can be opened first, and then the drain pipe 16 can be inserted. The sealing valve can be pushed open through the drain pipe 16. Then, appropriate pressure can be applied to the wrapping liquid cavity 12 through the liquid inlet hole to force the wrapping liquid to be quickly discharged from the drain pipe 16. After the liquid is completely discharged, the waste liquid can be collected for safe disposal. Then, the cleaning machine can be turned on to clean and dry the wrapping liquid cavity 12. Finally, new wrapping liquid can be added, the drain pipe 16 can be removed, and the plug can be installed to complete the operation.

[0035] A circulating liquid cooling chamber 20 is also provided on the outer layer of the sheathing liquid chamber 12. This chamber is used to introduce coolant to cool the sheathing liquid within the sheathing liquid chamber 12, thereby maintaining a constant temperature for the sheathing liquid and, in turn, the operating temperature of the optical crystal, ensuring its performance. Naturally, to enable the circulation of the coolant, the circulating liquid cooling chamber 20 is provided with a liquid inlet 21 and a liquid outlet 22. During use, the inlet 21 and outlet 22 can be connected to a water chiller, allowing the circulating liquid cooling chamber to be filled with and circulated with cooling water from the chiller, forcing the sheathing liquid and optical crystal to maintain a constant temperature.

[0036] like Figure 1 、 2 As shown, in this embodiment, the clamp body 1001 includes a support portion 101 and a cover 102. The support portion 101 and the cover 102 together enclose the encapsulated liquid cavity 12 and the crystal mounting position 11. The support portion 101 is annular, with a stepped structure provided on one side of its inner bore. This stepped structure, together with the cover 102, encloses the crystal mounting position 11 and the encapsulated liquid cavity 12. Furthermore, an annular groove surrounding the encapsulated liquid cavity is provided on the same side of the support portion 101. The cover 102 seals the annular groove to form the circulating liquid cooling cavity 20.

[0037] The structure of the base 1002 is as follows Figure 3 As shown, it is used to support the clamp body 1001. In this embodiment, an adjustment screw 23 for adjusting the crystal axis azimuth of the optical crystal is provided between the clamp body 1001 and the base 1002. The adjustment screw 23 can quickly adjust the azimuth angle of the clamp body 1001. Two adjustment lugs 24 are provided on the circumference of the clamp body 1001 and are mounted on the base 1002 via these adjustment lugs. The base 1002 is provided with a groove whose shape generally matches that of the clamp body. The adjustment screw 23 is mounted on the adjustment lugs 24 and cooperates with the table top supports formed at both ends of the groove on the base 1002.

[0038] Example 2 of the water-cooled gain medium and the crystal fixture for suppressing lateral parasitic oscillations of the present invention:

[0039] In Example 1 of the present invention's crystal fixture for a water-cooled gain medium and suppressing transverse parasitic oscillations, the fixture body employs a split-body structure, with a support portion and a cover joined axially. In this embodiment, the fixture body employs a radially split structure. To ensure rapid installation of optical crystals, the fixture body of the present invention can employ either an axially split or a radially split structure.

[0040] Example 3 of the water-cooled gain medium and the crystal fixture for suppressing lateral parasitic oscillations of the present invention:

[0041] In Example 1 of the water-cooled gain medium and crystal fixture for suppressing transverse parasitic oscillations of the present invention, asymmetric grooves are provided on the inner wall of the encapsulating liquid chamber of the fixture as a concave-convex structure. In this embodiment, the concave-convex structure is formed by protrusions provided on the inner wall of the encapsulating liquid chamber.

[0042] Example 4 of the water-cooled gain medium and the crystal fixture for suppressing lateral parasitic oscillations of the present invention:

[0043] In Example 1 of the water-cooled gain medium and crystal fixture for suppressing transverse parasitic oscillations of the present invention, a circulating liquid cooling chamber is provided at the periphery of the enveloping liquid chamber. In this embodiment, the circulating liquid cooling chamber is provided on one side of the enveloping liquid chamber, i.e., arranged axially side by side with the enveloping liquid chamber.

[0044] Example 5 of the water-cooled gain medium and the crystal fixture for suppressing lateral parasitic oscillations of the present invention:

[0045] In Example 1 of the water-cooled gain medium and crystal holder for suppressing transverse parasitic oscillations of the present invention, the encapsulating liquid chamber is located at the periphery of the crystal mounting. In this embodiment, the encapsulating liquid chamber is located on one axial side of the crystal mounting and maintains communication with the crystal mounting to enable the encapsulating liquid to act on the optical crystal.

Claims

1. A water-cooled gain medium and a crystal fixture for suppressing lateral parasitic oscillations, characterized in that: The clamp body comprises a crystal mounting position for mounting an optical crystal, and a wrapping liquid cavity communicating with the crystal mounting position is provided on the outer side of the crystal mounting position; the wrapping liquid cavity is an annular cavity coaxial with the crystal mounting position; the width of the wrapping liquid cavity in the thickness direction of the optical crystal is slightly smaller than that of the crystal mounting position, so as to form a limiting step for limiting the position of the optical crystal at the boundary between the wrapping liquid cavity and the crystal mounting position; the clamp body comprises a supporting portion and a sealing cover, the wrapping liquid cavity and the crystal mounting position are both surrounded by the supporting portion and the sealing cover; an annular groove surrounding the wrapping liquid cavity is provided on the outer wall of the supporting portion on the side adjacent to the sealing cover, and the sealing cover seals the annular groove to form a circulating liquid cooling cavity; The inner wall of the encapsulating liquid cavity is provided with a concave-convex structure for reducing the continuous reflection of the parasitic oscillation; the concave-convex structure is a micro-groove structure; The concave-convex structure is an asymmetric groove structure.

2. The water-cooled gain medium and the crystal fixture for suppressing lateral parasitic oscillation according to claim 1, characterized in that: A drainage hole is provided at the lower part of the wrapped liquid cavity, and a sealing valve which can be pushed open by an inserted drainage pipe is arranged in the drainage hole.

3. The water-cooled gain medium and the crystal fixture for suppressing lateral parasitic oscillation according to claim 1 or 2, characterized in that: The crystal fixture further comprises a base for supporting the clamp body, and an adjusting screw for adjusting the crystal axis azimuth of the optical crystal is provided between the clamp body and the base.

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