Multi-pass laser amplifier based on disc crystal

Abstract

The invention provides a multi-pass laser amplifier based on a disc crystal, and belongs to the technical field of laser amplifiers, a cooling part comprises a fixing frame, a heat sink piece and a cooling shell, the fixing frame is fixedly connected to the peripheral edge of a disc crystal main body, and the fixing frame and the cooling shell are sealed and fixed through a sealing ring; the heat sink sheet is rightward propped against the left side surface of the disc crystal main body through a clamping edge in a cooling shell cavity, a cooling assembly is transversely arranged in the cooling shell cavity, and the formed cooling part adopts an efficient conduction heat dissipation cooling design on the left side surface of the disc crystal main body, so that a cooling liquid is sprayed in a form of a plurality of equidistant conical columns; and due to the non-intersecting design that the cooling liquid in the conical column form reaches the heat sink sheet, the problem that the intersecting form of the adjacent cooling liquid in the conical column form is damaged is solved, and transverse extrusion, backflow and discharging of the cooling liquid in the middle area can be achieved.

Description

Technical Field

[0001] The invention relates to a multi-pass laser amplifier based on a disk crystal, belonging to the technical field of laser amplifiers. Background Art

[0002] Disk crystals have good laser properties such as absorption bandwidth, long fluorescence lifetime, and high quantum efficiency, which have begun to attract people's attention. In addition, the revolutionary design concept of the geometric structure of disk crystal lasers can greatly improve the beam conversion efficiency, which makes disk crystal lasers one of the most popular high-power solid lasers. However, when the disk crystal is working, it will convert about 11% of the pump energy into waste heat and deposit it inside the medium, and the current cooling structure can only cool the other side surface, which causes considerable temperature gradients and thermal stresses inside the crystal. On the one hand, excessive thermal stress will cause the medium to burst, thereby restricting the increase in pump power density; on the other hand, excessive temperature gradients will cause thermal lens effects, leading to instability of the resonant cavity and affecting the beam quality. Therefore, how to solve the thermal management problem of the laser is the core technical problem in the development of high-power disk lasers.

[0003] The existing cooling structure, water cooling structure is still the main way to solve the heat dissipation problem of high heat flux density disk lasers above kilowatt level. Among them, the fixed array jet structure is the most widely used. Its biggest advantage is simple structure and good controllability. Therefore, it is the main direction of the current research on the heat dissipation structure of high-heat devices. However, the biggest disadvantage of the fixed array jet is that the heat transfer coefficient is unevenly distributed and stagnation points are easily formed due to turbulence. In view of the above shortcomings, the present invention proposes a multi-pass laser amplifier based on disk crystal. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a multi-pass laser amplifier based on disk crystals to solve the existing problems.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a multi-pass laser amplifier based on a disk crystal, the structure of which includes an amplifier body, and a multi-pass reflection panel and a disk crystal body are built in the amplifier body, and a cooling part is provided on the left sealing sleeve of the disk crystal body, the cooling part includes a fixing frame, a heat sink, and a cooling shell, the fixing frame is fixed to the peripheral edge of the disk crystal body, the fixing frame and the cooling shell are sealed and fixed by a sealing ring, and the heat sink is pressed to the right against the left side surface of the disk crystal body through the clamping edge in the cooling shell cavity, a cooling component is horizontally arranged in the cooling shell cavity, the left end of the cooling component extends to the outside of the left side surface of the cooling shell, the left end of the cooling component is connected to a cooling circulation generator through a water inlet hose, and the water inlet end of the cooling circulation generator is connected to the lower end of the cooling shell through a water outlet hose; A gap for cooling spray water is reserved between the right side of the cooling assembly and the left side of the heat sink; The cooling component includes a spray part, and a rotating bracket is fixed on the left side of the spray part, and a rotating component is horizontally arranged on the left side surface of the rotating bracket with an eccentric spacing of 2-2.5mm based on the center point of the spray part, a water inlet part is sealed between the spray part and the rotating component, and a motor is engaged on one side of the left end of the rotating component.

[0006] As a further improvement, the remaining gap between the right side of the cooling assembly and the left side of the heat sink is 3-5 mm.

[0007] A further improvement is that the cooling shell includes a shell body, and an outward expansion groove is arranged in the middle of the shell body cavity, and a clamping edge for pressing the heat sink is arranged on the right side of the outward expansion groove, a through opening is opened in the middle of the left side of the shell body, and an external discharge port is opened at the lower end of the outward expansion groove.

[0008] A further improvement is that the spray part includes a spray plate, and an outer arc surface is arranged on the top surface of the spray plate, and a plurality of spray holes are arranged in longitudinal rows and equidistantly spaced on the top surface of the outer arc surface, a drainage channel is longitudinally penetrated through the outer arc surface between two adjacent longitudinal rows of spray holes, and the drainage channel is in the shape of a strip, a water inlet channel is connected to the side surface of the spray plate between each longitudinal row of spray holes, and a water inlet groove is arranged at the outer end between each water inlet channel.

[0009] A further improvement is that each spray hole is composed of a water outlet hole and a flow expansion port connected to each other.

[0010] A further improvement is that when the columnar coolant sprayed from each expansion port passes through the remaining gap between the right side of the cooling component and the left side of the heat sink to reach the left side of the spray heat sink, two adjacent coolant jet columns in the horizontal and vertical directions do not intersect and retain a 2-2.5mm spacing.

[0011] A further improvement is that the rotating component includes a rotating shaft, which is a hollow structure. A water outlet is opened on the right side of the rotating shaft body, a waterproof bearing is embedded in the middle of the rotating shaft body, a driven gear is arranged on the left side of the rotating shaft body, a universal joint is connected to the left tail of the rotating shaft, and a driving gear meshing with the driven gear is arranged on the motor.

[0012] A further improvement is that the water inlet component includes a water inlet cover, and the water inlet cover is glue-sealed and connected to the water inlet groove, and a water cavity connected to each water inlet channel is provided on the bottom surface of the water inlet cover, and a water inlet pipe is connected to the upper end of the water cavity, and the other end of the water inlet pipe is connected to the water outlet.

[0013] As a further improvement, the amplifier body, multi-pass reflection panel and disc crystal body are all existing technologies, and their structures are not described one by one here.

[0014] As a further improvement, a gap is reserved between the right side surface of the rotating bracket and the left side surface of the spraying member for drainage of the left openings of each drainage channel.

[0015] As a further improvement, the spacing of the remaining gap between the right side of the cooling assembly and the left side of the heat sink is 4 mm in the present invention.

[0016] A further improvement is that the cooling cycle generator is a prior art and the structure is not described in detail here.

[0017] The beneficial effects of the present invention are: The present invention provides a multi-pass laser amplifier based on a disk crystal. The cooling part is designed to have high-efficiency conduction heat dissipation cooling on the left side of the disk crystal body, and the cooling part is composed of a fixing frame, a heat sink, a sealing ring, a cooling shell, a cooling component, and a cooling cycle generator structure. The cooling liquid is sprayed in a plurality of equidistant conical column forms, and the non-intersecting design of the coolants in each conical column reaching the heat sink prevents the adjacent conical column coolants from intersecting and damaging the form. The coolant in the middle area can be squeezed back and discharged horizontally, and the coolant sprayed to the right in the middle area can be prevented from longitudinally reflux, so that the coolant sprayed horizontally to the right intersects with the coolant refluxed longitudinally, so that the coolant sprayed horizontally to the right cannot be directly sprayed onto the surface of the heat sink.

[0018] In addition, through the eccentric rotation function composed of the rotating bracket, rotating assembly, water inlet and motor, the spray part can rotate eccentrically when spraying, so that the coolants in various conical columns can be combined together to fully cover all areas on the left side of the heat sink that directly impact the heat sink, making the heat transfer coefficient and cooling distribution uniform, and preventing the problem of stagnation caused by solid point turbulence. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a multi-pass laser amplifier based on a disk crystal according to the present invention; Figure 2 It is a schematic diagram of the cooling part structure of the present invention; Figure 3 It is a schematic diagram of the cooling assembly structure of the present invention; Figure 4 This is a schematic diagram of the cooling housing structure of the present invention; Figure 5 This is a schematic diagram of the structure of the spray element of the present invention; Figure 6 It is a schematic cross-sectional view of the spraying member of the present invention; Figure 7It is a schematic diagram of the structure of the rotating assembly of the present invention; Figure 8 This is a schematic diagram of the water inlet structure of the present invention; Fig. 9 It is a schematic diagram of the rotary spraying stroke of the spraying member of the present invention. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] See also Figure 1-Figure 9 The present invention provides a multi-pass laser amplifier based on a disk crystal, and its structure includes an amplifier body 1, and a multi-pass reflection panel 2 and a disk crystal body 3 are built in the amplifier body 1, and a cooling part 4 is provided on the left sealing sleeve of the disk crystal body 3, and the cooling part 4 includes a fixing frame 41, a heat sink 42, and a cooling shell 44, and the fixing frame 41 is fixed on the periphery of the disk crystal body 3, and the fixing frame 41 and the cooling shell 44 are sealed and fixed by a sealing ring 43, and the heat sink 42 is pressed to the right against the left side surface of the disk crystal body 3 through the clamping edge in the cavity of the cooling shell 44, and a cooling component 45 is transversely arranged in the cavity of the cooling shell 44, and the left end of the cooling component 45 extends to the outside of the left side surface of the cooling shell 44, and the left end of the cooling component 45 is connected to a cooling circulation generator 46 through a water inlet hose, and the water inlet end of the cooling circulation generator 46 is connected to the lower end of the cooling shell 44 through a water outlet hose; A gap for cooling spray water is reserved between the right side of the cooling assembly 45 and the left side of the heat sink 42; The cooling component 45 includes a spray component 451, and a rotating bracket 452 is fixed to the left side of the spray component 451, and a rotating component 453 is horizontally arranged on the left side of the rotating bracket 452 with the center point of the spray component 451 as the reference at an eccentric interval of 2-2.5mm, and a water inlet component 454 is sealed between the spray component 451 and the rotating component 453, and a motor 455 is engaged on one side of the left end of the rotating component 453.

[0022] The remaining gap between the right side of the cooling assembly 45 and the left side of the heat sink 42 is 3-5 mm.

[0023] The cooling shell 44 includes a shell body 441, and an outward expansion groove 442 is arranged in the middle of the cavity of the shell body 441, and a clamping edge 443 for pressing the heat sink 42 is arranged on the right side of the outward expansion groove 442, a through opening 444 is opened in the middle of the left side of the shell body 441, and an outer discharge port 445 is opened at the lower end of the outward expansion groove 442.

[0024] The spray member 451 includes a spray plate 4511, and an outer arc surface 4512 is arranged on the top surface of the spray plate 4511, and a plurality of spray holes 4513 are arranged in a longitudinal row and equidistantly spaced on the top surface of the outer arc surface 4512, and a drainage channel 4514 is longitudinally penetrated on the outer arc surface 4512 between two adjacent longitudinal rows of spray holes 4513, and the drainage channel 4514 is in a strip shape, and a water inlet channel 4515 is connected to the side of the spray plate 4511 between each longitudinal row of spray holes 4513, and a water inlet groove 4516 is arranged at the outer end between each water inlet channel 4515.

[0025] Each spray hole 4513 is composed of a water outlet hole 45131 and a flow expansion port 45132 connected to each other.

[0026] When the columnar coolant sprayed out by each expansion port 45132 passes through the remaining gap between the right side of the cooling component 45 and the left side of the heat sink 42 to reach the left side of the spray heat sink 42, two adjacent coolant spray columns in the transverse and longitudinal directions do not intersect and retain a 2-2.5mm gap.

[0027] The rotating assembly 453 includes a rotating shaft 4531, which is a hollow structure. A water outlet 4532 is connected to the right side of the rotating shaft 4531, a waterproof bearing 4533 is embedded in the middle of the rotating shaft 4531, a driven gear 4534 is arranged on the left side of the rotating shaft 4531, a universal joint 4535 is connected to the left tail of the rotating shaft 4531, and a driving gear meshing with the driven gear 4534 is arranged on the motor 455.

[0028] The water inlet component 454 includes a water inlet cover 4541, and the water inlet cover 4541 is glue-sealed and connected to the water inlet groove 4516, and the bottom surface of the water inlet cover 4541 is provided with a water cavity 4542 connected to each water inlet channel 4515, and the upper end of the water cavity 4542 is connected to the water inlet pipe 4543, and the other end of the water inlet pipe 4543 is connected to the water outlet 4532.

[0029] Working principle: First, the heat sink 42 is attached to the disc crystal body 3 to quickly conduct heat to the disc crystal body 3, and at this time, the cooling circulation generator 46 enters the cooling liquid into the spray part 451 through the rotating component 453 and the water inlet 454, so that the cooling liquid expands and sprays out from the expansion ports 45132 that are evenly spaced in the longitudinal and transverse directions. The conical column coolant passes through the 4mm spacing gap between the right side of the cooling component 45 and the left side of the heat sink 42 to spray and cool the left side of the heat sink 42, and the two adjacent coolant spray columns in the transverse and longitudinal directions do not intersect and retain a 2-2.5mm spacing design, so that the coolant sprayed in the middle area will be squeezed to the left and returned to each drainage channel The coolant flowing in channel 4514 is discharged to the cavity of the shell body 441. Since the rightward spraying velocity of the coolant is greater than the leftward reflux velocity, it is difficult to destroy the shape of the conical columnar coolant sprayed to the right by the expansion flow. Then the refluxed coolant is collected downward to the lower end of the outer expansion groove 442 and recycled into the cooling circulation generator 46. In addition, the outer part of the conical columnar coolant sprayed outward by each expansion port 45132 of the outer ring of the spray part 451 will be directly discharged to the cavity of the shell body 441. The advantage of this design is that the coolant sprayed to the right will not collide with the coolant after impacting the left side of the heat sink 42, so that the coolant sprayed to the right cannot completely reach the left side of the heat sink 42.

[0030] In addition, when the spray part 451 is spraying, the motor 455 will drive the rotating component 453, and the spray part 451 can be rotated and sprayed through the rotating bracket 452. The rotating component 453 is horizontally designed with an eccentric spacing of 2-2.5mm on the left side of the rotating bracket 452 with the center point of the spray part 451 as the reference, so that the rotation mode of the spray part 451 deviates from the center of the circle. The advantage of such a design is that since the two adjacent coolant jet columns in the horizontal and vertical directions do not intersect and have a spacing of 2-2.5mm, if the spray part 451 does not rotate, the spraying of the heat sink 42 corresponding to the spacing of 2-2.5mm can only be achieved by covering with the impact reflux coolant, which will result in uneven distribution of the spray heat transfer coefficient.

[0031] In addition, the spraying member 451 rotates eccentrically so that two adjacent coolant jets in the transverse and longitudinal directions can directly impact and cover all areas on the left side of the heat sink 42, and there will be no point where the coolant cannot be directly impacted.

[0032] Through the above description, it can be seen that the biggest disadvantage of using fixed array jets is the uneven distribution of heat transfer coefficients, which is easily affected by turbulence and forms stagnation points.

[0033] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0034] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multi-pass laser amplifier based on a disk crystal, the structure of which comprises an amplifier body (1), wherein a multi-pass reflection panel (2) and a disk crystal body (3) are built into the amplifier body (1), and a cooling portion (4) is provided on the left sealing sleeve of the disk crystal body (3), characterized in that: The cooling part (4) comprises a fixing frame (41), a heat sink (42), and a cooling shell (44); the fixing frame (41) is fixedly connected to the peripheral edge of the disc crystal body (3); the fixing frame (41) and the cooling shell (44) are sealed and fixed via a sealing ring (43); and the heat sink (42) is pressed rightward against the left side surface of the disc crystal body (3) via a clamping edge in the cavity of the cooling shell (44); a cooling component (45) is transversely arranged in the cavity of the cooling shell (44); the left end of the cooling component (45) extends to the outside of the left side surface of the cooling shell (44); the left end of the cooling component (45) is connected to a cooling circulation generator (46) via a water inlet hose; and the water inlet end of the cooling circulation generator (46) is connected to the lower end of the cooling shell (44) via a water outlet hose; A gap for cooling spray water is reserved between the right side surface of the cooling component (45) and the left side surface of the heat sink (42); The cooling component (45) comprises a spray component (451), a rotating bracket (452) is fixed on the left side of the spray component (451), and a rotating component (453) is transversely arranged on the left side surface of the rotating bracket (452) with the center point of the spray component (451) as a reference at an eccentric spacing of 2-2.5 mm, a water inlet component (454) is sealed between the spray component (451) and the rotating component (453), and a motor (455) is meshed on one side of the left end of the rotating component (453).

2. A multi-pass laser amplifier based on a disk crystal according to claim 1, characterized in that: The remaining gap between the right side surface of the cooling component (45) and the left side surface of the heat sink (42) is 3-5 mm.

3. The multi-pass laser amplifier based on disk crystal according to claim 2, characterized in that: The cooling shell (44) comprises a shell body (441), and an outward expansion groove (442) is arranged in the middle of the inner cavity of the shell body (441), and a clamping edge (443) for pressing the heat sink (42) is arranged on the right side of the outward expansion groove (442), a through opening (444) is opened in the middle of the left side of the shell body (441), and an outer discharge port (445) is opened at the lower end of the outward expansion groove (442).

4. The multi-pass laser amplifier based on disk crystal according to claim 3, characterized in that: The spraying member (451) comprises a spraying plate (4511), wherein an outer arc-shaped surface (4512) is provided on the top surface of the spraying plate (4511), and a plurality of spraying holes (4513) are arranged in a longitudinal row and at equal intervals on the top surface of the outer arc-shaped surface (4512), a drainage channel (4514) is longitudinally provided on the outer arc-shaped surface (4512) between two adjacent longitudinal rows of spraying holes (4513), and the drainage channel (4514) is in a strip shape, and a water inlet channel (4515) is provided on the side surface of the spraying plate (4511) between each of the spraying holes (4513) in each longitudinal row, and a water inlet notch (4516) is provided at the outer end between each of the water inlet channels (4515).

5. The multi-pass laser amplifier based on disk crystal according to claim 4, characterized in that: Each spray hole (4513) is composed of a water outlet hole (45131) and a flow expansion port (45132) connected together.

6. The multi-pass laser amplifier based on disk crystal according to claim 5, characterized in that: When the columnar coolant sprayed out by each expansion port (45132) passes through the remaining gap between the right side of the cooling component (45) and the left side of the heat sink (42) to reach the left side of the spray heat sink (42), two adjacent coolant spray columns in the transverse and longitudinal directions do not intersect and a spacing of 2-2.5 mm is retained.

7. The multi-pass laser amplifier based on disk crystal according to claim 6, characterized in that: The rotating assembly (453) comprises a rotating shaft (4531), the rotating shaft (4531) is a hollow structure, a water outlet (4532) is connected to the right side of the rotating shaft (4531), a waterproof bearing (4533) is embedded in the middle of the rotating shaft (4531), a driven gear (4534) is arranged on the left side of the rotating shaft (4531), a universal joint (4535) is connected to the left tail of the rotating shaft (4531), and a driving gear meshing with the driven gear (4534) is arranged on the motor (455).

8. The multi-pass laser amplifier based on disk crystal according to claim 7, characterized in that: The water inlet component (454) comprises a water inlet cover (4541), and the water inlet cover (4541) is glue-sealed and sleeved in the water inlet groove (4516), and a water flow cavity (4542) connected to each water inlet channel (4515) is provided on the bottom surface of the water inlet cover (4541), and a water inlet pipe (4543) is connected to the upper end of the water flow cavity (4542), and the other end of the water inlet pipe (4543) is connected to the water outlet (4532).

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