Condensation cavity for large-energy laser and laser

Abstract

The utility model relates to a light-gathering cavity for a large-energy laser and the laser. The light-gathering cavity comprises a cavity assembly, an inner end, a middle end, an outer end, a xenon lamp fixing piece and a glass tube. An accommodating channel for accommodating the xenon lamp and the laser crystal is formed in the cavity assembly; an inner end, a middle end and an outer end are sequentially arranged at the two ends of the cavity assembly in the extending direction of the two ends of the containing channel so as to seal the containing channel; the glass tube is arranged in the containing channel, the two ends of the glass tube are installed at the inner ends, a laser crystal is contained in the glass tube, and a crystal cooling channel is formed between the glass tube and the laser crystal. The outer end is used for hermetically connecting the laser crystal; the inner end head, the middle end head and the outer end head are respectively provided with a through hole for the xenon lamp to penetrate through, and the xenon lamp fixing piece is arranged on the outer side of the outer end head and used for connecting the xenon lamp and the outer end head in a sealed mode. A gap is formed between the through hole and the xenon lamp to form a xenon lamp cooling channel; and the middle end head is provided with an inlet and an outlet which are communicated with the crystal cooling channel and the xenon lamp cooling channel.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers, in particular to a focusing cavity and a laser for high-energy lasers. Background Art

[0002] Flash lamp-pumped high-energy solid-state lasers are a type of laser used exclusively for scientific research and industry. This type of laser can output nanosecond laser pulses >10J, with a repetition rate generally <20Hz. It is usually used in laser shock strengthening, laser plasma research, laser damage threshold research, titanium sapphire laser pump sources, laser annealing and other fields.

[0003] Pulsed xenon lamps have the characteristics of high luminous energy and emission spectrum matching the absorption spectrum of Nd:YAG laser crystals. They are widely used pump sources for high-energy laser pulses. Nd:YAG laser crystals are a common laser emitting crystal that can be stimulated to emit laser pulses with a wavelength of 1064nm. The "focusing cavity" is an indispensable key component for laser generation and amplification using xenon lamps and Nd:YAG crystals. The focusing cavity can fix and clamp the xenon lamp and Nd:YAG crystal, and form an enclosed space for light reflection, so that the light emitted by the xenon lamp is irradiated onto the Nd:YAG crystal, realizing crystal energy storage, outputting laser pulses or amplifying laser pulses.

[0004] Common lamp-pumped high-energy focusing cavities include: barium sulfate powder + glass cavity, metal reflection cavity, ceramic reflection cavity, etc. The electro-optical efficiency of barium sulfate powder + glass cavity is high, but because the outside of the cavity filled with barium sulfate powder does not have good water cooling and heat dissipation, the cavity heats up during long-term operation or high-repetition-rate operation, which will cause unstable laser output and poor directivity. The metal reflection cavity uses gold-plated or silver-plated metal to reflect pump light to form a closed space for light reflection. The gold-plated layer of this cavity is exposed to strong light from the xenon lamp and thermal shock for a long time, which is easy to age, causing the gold-plated layer to fall off, reduce reflection efficiency, and increase maintenance costs in the later stage. The ceramic reflection cavity uses the ability of white ceramic to strongly reflect the pump light emitted by the xenon lamp to sinter a reflection cavity with a special shape. The ceramic can be soaked in water and effectively cooled, so it is also a widely used focusing cavity. However, the cooling effect of traditional ceramic cavities is poor. The above problems need to be solved urgently. Utility Model Content

[0005] The utility model discloses a focusing cavity for a large-energy laser, aiming to solve the technical problems existing in the prior art.

[0006] The utility model adopts the following technical solutions:

[0007] On the one hand, the utility model provides a focusing cavity for a large-energy laser, which includes a cavity assembly, an inner end, a middle end, an outer end, a xenon lamp fixing part and a glass tube; the cavity assembly has a accommodating channel for accommodating a xenon lamp and a laser crystal; the inner end, the middle end and the outer end are respectively arranged in sequence at both ends of the cavity assembly along the extension direction of the two ends of the accommodating channel to seal the accommodating channel; the glass tube is arranged in the accommodating channel, and the two ends are installed on the inner end, the laser crystal is accommodated in the glass tube, and a crystal cooling channel is formed between the glass tube and the laser crystal; the outer end is used for sealing and connecting the laser crystal; the inner end, the middle end and the outer end are respectively provided with through holes for the xenon lamp to pass through, and the xenon lamp fixing part is arranged on the outside of the outer end for sealing and connecting the xenon lamp and the outer end; there is a gap between the through hole and the xenon lamp to form a xenon lamp cooling channel; the middle end is provided with an inlet and an outlet connected to the crystal cooling channel and the xenon lamp cooling channel.

[0008] In the focusing cavity for a high-energy laser of the utility model, the xenon lamp fixing part includes a xenon lamp pressing plate, a xenon lamp electrode clamp and a first sealing ring; the xenon lamp pressing plate is used to press the sealing ring between the xenon lamp and the outer end; the xenon lamp electrode clamp is connected to the end of the xenon lamp.

[0009] In the focusing cavity for a high-energy laser of the utility model, the inlet and the outlet are respectively located on the two middle ends and at opposite sides.

[0010] In the focusing cavity for a high-energy laser of the utility model, the xenon lamp cooling channels are multiple in number; each of the xenon lamp cooling channels accommodates the xenon lamp respectively; a first distribution cavity is formed between the inner end and the middle end; the first distribution cavity is connected to the crystal cooling channel and the multiple xenon lamp cooling channels.

[0011] In the focusing cavity for a high-energy laser of the utility model, the accommodating channel has an accommodating groove for accommodating the xenon lamp; the cross section of the accommodating groove is a curved surface, and the groove opening faces the laser crystal.

[0012] In the focusing cavity for a high-energy laser of the utility model, a boss is provided on the side of the outer end facing the middle end; the boss presses the second sealing ring sleeved on the laser crystal onto the laser crystal and the middle end to seal the outer end, the laser crystal and the middle end.

[0013] In the focusing cavity for a high-energy laser of the utility model, an electrode cooling channel communicating with the xenon lamp cooling channel is provided on the outer end; the electrode cooling channel is arranged adjacent to the electrode of the xenon lamp.

[0014] In the focusing cavity for a high-energy laser of the utility model, a laser passage groove is provided on one side of the outer end facing the end of the laser crystal; the laser passage groove accommodates the end of the laser crystal.

[0015] In the focusing cavity for high-energy laser of the utility model, the inner end and the cavity assembly are sealed and connected via a third sealing ring; the third sealing ring is arranged in a mounting groove on the side wall of the cavity assembly.

[0016] In the focusing cavity for high-energy laser of the utility model, the cavity assembly and the channel wall of the accommodating channel are coated with a coating capable of absorbing the laser emitted by the laser crystal.

[0017] In a second aspect, the utility model further provides a laser, which includes the above-mentioned focusing cavity for high-energy laser.

[0018] The technical solution adopted by the utility model can achieve the following beneficial effects:

[0019] The utility model mainly provides a focusing cavity for a large-energy laser, and a xenon lamp cooling channel is formed based on the arrangement of an inner end, a middle end and an outer end, and a crystal cooling channel is formed between a glass tube and a laser crystal to cool the xenon lamp and the laser crystal, and a xenon lamp fixing piece is used to seal the end of the xenon lamp on the outside of the outer end, thereby increasing the proportion of the xenon lamp body in the xenon lamp cooling channel to improve the cooling effect, so as to be suitable for large-energy lasers. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the following is a brief introduction to the drawings required for the description of the embodiment, which constitute a part of the utility model. The schematic embodiment of the utility model and its description explain the utility model and do not constitute an improper limitation of the utility model. In the drawings:

[0021] Figure 1 This is a schematic diagram of the main structure of a focusing cavity for a high-energy laser of the utility model;

[0022] Figure 2 The utility model is a focusing cavity for a large energy laser Figure 1 A cross-sectional view of

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of a focusing cavity for a high-energy laser of the utility model;

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of a focusing cavity for a high-energy laser of the utility model;

[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of a focusing cavity for a high-energy laser of the utility model;

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of a focusing cavity for a high-energy laser of the utility model;

[0027] Figure 7 The utility model is a schematic diagram of a top view of a focusing cavity for a high-energy laser.

[0028] Description of reference numerals:

[0029] 1. Cavity assembly; 11. Accommodating channel; 111. Accommodating groove; 12. Cavity cover; 13. Ceramic cavity; 2. Inner end; 3. Middle end; 4. Outer end; 41. Boss; 42. Electrode cooling channel; 43. Laser path groove; 5. Xenon lamp fixture; 51. Xenon lamp pressure plate; 52. Xenon lamp electrode clamp; 53. First sealing ring; 6. Glass tube; 7. Xenon lamp; 8. Laser crystal; 9. Crystal cooling channel; 10. Xenon lamp cooling channel; 101. First distribution chamber; 102. Fifth sealing ring; 103. Second sealing ring; 104. Third sealing ring; 105. Water nozzle; 106. Fourth sealing ring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. In the description of the utility model, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0032] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In order to solve the problems existing in the prior art, the present application provides a focusing cavity for a high-energy laser, such as Figure 1-6 As shown, it includes a cavity assembly 1, an inner end cap 2, a middle end cap 3, an outer end cap 4, a xenon lamp fixing part 5 and a glass tube 6; the cavity assembly 1 has a receiving channel 11 for receiving the xenon lamp 7 and the laser crystal 8; the inner end cap 2, the middle end cap 3 and the outer end cap 4 are respectively arranged at both ends of the cavity assembly 1 in sequence along the extending direction of both ends of the receiving channel 11 to seal the receiving channel 11; the glass tube 6 is arranged in the receiving channel 11, and both ends are installed on the inner end cap 2, and the laser crystal 8 is received in the glass tube 6 (the laser crystal 8 and the glass tube 6 are arranged coaxially, so that the interval between the two is consistent to ensure uniform cooling), and a crystal cooling space is formed between the glass tube 6 and the laser crystal 8. Channel 9, that is, there is a gap between the two, and the preferred gap is 0.5mm-3mm; the outer end 4 is used for sealing and connecting the laser crystal 8; the inner end 2, the middle end 3 and the outer end 4 are respectively provided with through holes for the xenon lamp 7 to pass through, and the xenon lamp fixing part 5 is arranged on the outside of the outer end 4, and is used for sealing and connecting the xenon lamp 7 and the outer end 4; there is a gap between the through hole and the xenon lamp 7 to form a xenon lamp cooling channel 10; the middle end 3 is provided with an inlet and an outlet connected to the crystal cooling channel 9 and the xenon lamp cooling channel 10 (connected with the external cooling system through the inlet and outlet, such as the cooling water system), and preferably, a water nozzle 105 is installed on the inlet and the outlet to connect to the external water pipe.

[0034] The utility model is based on the arrangement of an inner end, a middle end and an outer end to form a xenon lamp cooling channel, and a crystal cooling channel is formed between the glass tube and the laser crystal to cool the xenon lamp and the laser crystal, and a xenon lamp fixing piece is used to seal the end of the xenon lamp outside the outer end, thereby increasing the proportion of the xenon lamp body in the xenon lamp cooling channel to improve the cooling effect; and the glass tube is installed at the inner end, and the laser crystal and the xenon lamp are installed at the outer end, which is convenient for assembling the focusing cavity.

[0035] In some embodiments, Figure 3 As shown, the xenon lamp fixing member 5 includes a xenon lamp pressing plate 51, a xenon lamp electrode clamp 52 and a first sealing ring 53; the xenon lamp pressing plate 51 is used to press the sealing ring 53 between the xenon lamp 7 and the outer end 4, and the xenon lamp cooling channel 10 is blocked based on the sealing ring 53 to prevent the cooling medium from flowing out; the xenon lamp electrode clamp 52 is connected to the end of the xenon lamp 7; specifically, the xenon lamp electrode clamp 52 is connected to the cylindrical electrode connection at the end of the xenon lamp 7, which can be made of gold-plated copper; the xenon lamp pressing plate 51 can be made of high-temperature resistant peek or polytetrafluoroethylene material.

[0036] In some embodiments, Figure 2 As shown, a second distribution cavity 107 is formed between the outer end 4 and the middle end 3 ; the second distribution cavity 107 communicates with the inlet and the outlet as well as the xenon lamp cooling channel 10 .

[0037] In some embodiments, Figure 7 As shown, the inlet and the outlet are respectively located on the two middle ends 3 and on opposite sides; since the inlet and the outlet are arranged on opposite sides, the resistance of the cooling medium when flowing through the xenon lamp cooling channel 10 and the crystal cooling channel 9 is relatively uniform, and thus the cooling medium flows evenly, thereby improving the cooling effect.

[0038] In some embodiments, Figure 4 As shown, there are multiple xenon lamp cooling channels 10; each xenon lamp cooling channel 10 accommodates a xenon lamp 7 respectively; a first distribution chamber 101 is formed between the inner end 2 and the middle end 3; the first distribution chamber 101 is connected to the crystal cooling channel 9 and multiple xenon lamp cooling channels 10; based on the setting of the xenon lamp cooling channel 10, multiple xenon lamps 7 can be accommodated to increase the irradiation power of the laser crystal 8, and based on the redistribution of the cooling medium by the first distribution chamber 101, the fluid in the first distribution chamber 101 is buffered and mixed, so that the temperature of the fluid that re-flows into the crystal cooling channel 9 and the xenon lamp cooling channel 10 after mixing is consistent, so that the cooling effect on the xenon lamp 7 and the laser crystal 8 is more consistent.

[0039] Preferably, the thickness of the first distribution cavity 101 between the inner end 2 and the middle end 3 is 2-4 mm; if the thickness is too thin, it will affect the water flow into the outside of the laser crystal, the water flow will be small, and the crystal will not be cooled sufficiently; if the thickness is too thick, the entire cavity will become longer, and then the YAG crystal will also become longer, which will significantly increase the cost.

[0040] Preferably, Figure 2 As shown, a second distribution chamber 107 is formed between the outer end 4 and the middle end 3; the second distribution chamber 107 connects the inlet and the outlet as well as the xenon lamp cooling channel 10; at this time, the cooling medium flows from the inlet into the second distribution chamber 107 and then into the xenon lamp cooling channel 10 before flowing into the first distribution chamber 101, a part of which flows into the containing channel 11 through the xenon lamp cooling channel 10 again, and another part flows into the crystal cooling channel 9. After the two cooling media merge in the first distribution chamber 101 on the other side, they pass through the xenon lamp cooling channel 10 and the second distribution chamber 107 in sequence before flowing out from the outlet; based on the buffering mixing and distribution of the cooling medium by the first distribution chamber 101 and the second distribution chamber 107, on the one hand, the residence time of the fluid is increased, and on the other hand, the temperature of the cooling medium in each xenon lamp cooling channel 10 and the crystal cooling channel 9 is made consistent.

[0041] Preferably, the accommodating channel 11 has an accommodating groove 111 for accommodating the xenon lamp 7; the cross section of the accommodating groove 111 is a curved surface, and the groove faces the laser crystal 8. Specifically, the accommodating grooves 111 correspond to the xenon lamps 7 one by one, and are evenly distributed along the circumference of the accommodating channel 11, thereby improving the uniformity of pumping, while reducing the pumping cross section and increasing the pumping efficiency. Further preferably, the number of xenon lamps 7 is 4, and they are evenly distributed (i.e., symmetrically distributed) along the circumference of the accommodating channel 11.

[0042] In some embodiments, Figure 2 and 5 As shown, a boss 41 is provided on the side of the outer end 4 facing the middle end 3; the boss 41 presses the second sealing ring 103 sleeved on the laser crystal 8 onto the laser crystal 8 and the middle end 3 to seal the outer end 4, the laser crystal 8 and the middle end 3; based on the setting of the boss, the surface contact between the outer end and the middle end is avoided, and at the same time, it can better contact with the second sealing ring 103 on the laser crystal 8 and squeeze the seal.

[0043] In some embodiments, Figure 5 As shown, an electrode cooling channel 42 connected to the xenon lamp cooling channel 10 is provided on the outer end 4; the electrode cooling channel 42 is arranged adjacent to the electrode of the xenon lamp 7 to cool the electrode of the xenon lamp 7, thereby further improving the cooling effect of the xenon lamp.

[0044] In some embodiments, Figure 3 As shown, a laser passage groove 43 is provided on one side of the outer end 4 facing the end of the laser crystal 8; the laser passage groove 43 accommodates the end of the laser crystal 8; based on the setting of the laser passage groove 43, the redundant light-blocking part of the outer end is cut off, so that the light spot emitted by the laser crystal can pass through without obstruction. Preferably, the end face of the laser crystal is close to the bottom of the laser passage groove 43.

[0045] In some embodiments, Figure 2 As shown, the inner end 2 and the cavity assembly 1 are sealed and connected via a third sealing ring 104; the third sealing ring 104 is arranged on a mounting groove on the side wall of the cavity assembly 1; the third sealing ring 104 is arranged in an area that cannot be irradiated by the xenon lamp 7 to prevent the third sealing ring 104 from being irradiated and aged by the xenon lamp 7.

[0046] In some embodiments, the wall of the receiving channel 11 is coated with a coating capable of absorbing the laser light emitted by the laser crystal 8, such as a samarium oxide-doped glaze layer or other materials capable of absorbing laser light. The samarium-doped coating can effectively absorb the ultraviolet light emitted by the xenon lamp and the spontaneous radiation light in the 1 μm band emitted by the laser crystal 8, thereby improving the electro-optical efficiency and suppressing ASE (spontaneous stimulated emission). The doping amount is 5%-10% (mass percentage).

[0047] In some embodiments, Figure 3 As shown, the cavity assembly 1 includes a cavity outer cover 12 and a ceramic cavity 13 ; the accommodating channel 11 is arranged in the ceramic cavity 13 ; the ceramic cavity 13 is arranged in the cavity outer cover 12 ; and the cavity outer cover 12 is sealed and connected to the inner terminal 2 .

[0048] In some embodiments, the glass tube 6 is a glass material doped with samarium metal elements, and the doping concentration is 5%-10% (mass percentage); the thickness of the glass tube 6 is 0.5mm-2.5mm; the characteristic of samarium element absorbing light in the 1μm band is utilized to absorb the spontaneous radiation 1064nm wavelength laser generated by the laser crystal, and suppress the lateral ASE of the laser crystal, thereby improving the energy storage of the laser crystal and achieving the purpose of improving the electro-optical efficiency of the ceramic cavity.

[0049] In some embodiments, Figure 2 As shown, the edges of the middle end 3 and the outer end 4 are sealed by a fourth sealing ring 106, and the cooling medium can flow inside. Specifically, a sealing ring groove is provided in the outer end 4. The inner end 2 and the middle end 3 are sealed and connected by a fifth sealing ring 102.

[0050] In some embodiments, a focusing cavity for a high-energy laser further includes a base; the base is connected to the inner end 2.

[0051] In some embodiments, the inner end head 2, the middle end head 3 and the outer end head 4 are all made of stainless steel.

[0052] A laser comprises the above-mentioned focusing cavity for high-energy laser, and also comprises a xenon lamp 7 and a laser crystal 8.

[0053] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A focusing cavity for a high energy laser, characterized in that: It includes a cavity assembly, an inner end, a middle end, an outer end, a xenon lamp fixing part and a glass tube; The cavity assembly has a receiving channel for receiving a xenon lamp and a laser crystal; The inner end head, the middle end head and the outer end head are respectively and sequentially arranged at two ends of the cavity assembly along the extending direction of two ends of the accommodating channel to seal the accommodating channel; The glass tube is arranged in the accommodating channel, and both ends are mounted on the inner end caps. The laser crystal is accommodated in the glass tube, and a crystal cooling channel is formed between the glass tube and the laser crystal. The outer end is used for sealing and connecting the laser crystal; The inner end, the middle end and the outer end are respectively provided with through holes for the xenon lamp to pass through, and the xenon lamp fixing piece is arranged outside the outer end for sealingly connecting the xenon lamp and the outer end; There is a gap between the through hole and the xenon lamp to form a xenon lamp cooling channel; The middle end is provided with an inlet and an outlet connected to the crystal cooling channel and the xenon lamp cooling channel.

2. The focusing cavity for high energy laser according to claim 1, characterized in that: The xenon lamp fixing member comprises a xenon lamp pressing plate, a xenon lamp electrode clamp and a first sealing ring; The xenon lamp pressing plate is used to press the sealing ring between the xenon lamp and the outer end; The xenon lamp electrode clamp is connected to the end of the xenon lamp.

3. The focusing cavity for high energy laser according to claim 1, characterized in that: The inlet and the outlet are respectively located on the two middle ends and at opposite sides.

4. The focusing cavity for high energy laser according to claim 1, characterized in that: The xenon lamp cooling channels are multiple in number; each of the xenon lamp cooling channels accommodates the xenon lamp respectively; A first distribution cavity is formed between the inner end and the middle end; The first distribution chamber is communicated with the crystal cooling channel and the plurality of xenon lamp cooling channels.

5. The focusing cavity for high energy laser according to claim 1, characterized in that: The accommodating channel has an accommodating groove for accommodating the xenon lamp; The cross section of the accommodating groove is a curved surface, and the groove opening faces the laser crystal.

6. The focusing cavity for high energy laser according to claim 1, characterized in that: A boss is provided on one side of the outer end facing the middle end; The boss presses the second sealing ring sleeved on the laser crystal onto the laser crystal and the middle end head to seal the outer end head, the laser crystal and the middle end head.

7. The focusing cavity for high energy laser according to claim 1, 2 or 6, characterized in that: The outer end is provided with an electrode cooling channel connected to the xenon lamp cooling channel; The electrode cooling channel is arranged adjacent to the electrode of the xenon lamp.

8. The focusing cavity for high energy laser according to claim 1, 2 or 6, characterized in that: A laser passage groove is provided on one side of the outer end facing the end of the laser crystal; The laser passage groove accommodates the laser crystal end.

9. The focusing cavity for high energy laser according to claim 1, characterized in that: The inner end head and the cavity assembly are sealed and connected via a third sealing ring; The third sealing ring is arranged in a mounting groove on the side wall of the cavity assembly.

10. The focusing cavity for high energy laser according to claim 1 or 5, characterized in that: The cavity component and the channel wall of the accommodating channel are coated with a coating capable of absorbing the laser emitted by the laser crystal.

11. A laser, characterized in that: A focusing cavity for a high-energy laser comprising any one of claims 1 to 10.

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