A high-repetition-rate femtosecond pulse compressor capillary fiber low-vibration water cooling device

Abstract

This invention provides a low-vibration water-cooling device for capillary optical fibers in high-repetition-rate femtosecond pulse compressors, used for cooling the fiber end face of high-power capillary femtosecond pulse compressors. The device includes a mounting groove and a water-cooling jacket. The water-cooling jacket is mounted in the mounting groove and fixedly installed through it. The water-cooling jacket includes a water-cooling sleeve and a flow-disrupting element. The flow-disrupting element includes an intermediate shaft and several flow-disrupting fins disposed on the outer wall of the intermediate shaft. An axial fiber mounting hole is provided on the intermediate shaft. A cavity is reserved in the inner wall of the water-cooling sleeve to accommodate heat-conducting fluid, and the cavity connects to the inlet and outlet of the heat-conducting fluid. This invention provides a low-vibration water-cooling device for capillary optical fibers in high-repetition-rate femtosecond pulse compressors, achieving vibration-damping end-face cooling and suppressing high-frequency cooling vibrations in the capillary end face of the femtosecond pulse compressor.

Description

Technical Field

[0001] This invention relates to the field of femtosecond pulse compressor cooling technology, specifically to a low-vibration water-cooling device for capillary optical fiber in a high-repetition-rate femtosecond pulse compressor. Background Technology

[0002] Ultrafast femtosecond lasers possess characteristics such as narrow pulse width and high intensity. During interaction with materials, they can reduce the influence of factors such as reaction time and thermal effects. Utilizing femtosecond lasers to excite the optical nonlinearity of materials allows for better applications in fields such as super-resolution imaging, optical limiting, and ultrafast optical devices. The superior performance of ultrafast femtosecond lasers is further enhanced by the increased pulse temporal resolution resulting from shorter pulse durations. However, currently, extracavity compression of ultrafast femtosecond lasers is mainly achieved through self-phase modulation to broaden the spectrum in capillary fibers filled with inert gas, combined with chirp compensation. These advantages become more significant with narrower pulse widths. Therefore, it is necessary to compress long pulses into short pulses. The role of a hollow capillary compressor is to compress femtosecond pulses from long pulses to short pulses, for example, from 45 fs to 10 fs. During the coupling process, the hollow capillary compressor converts energy loss into heat, causing heat generation.

[0003] Hollow fiber is one of the most widely used waveguide structures in the field of ultra-intense and ultrafast lasers. Thanks to its hollow structure, hollow fiber can significantly reduce the damage of ultrashort pulses to the fiber, enabling it to transmit pulse peak power much higher than that of traditional silica fiber. At the same time, its waveguide structure significantly increases the distance of nonlinear interaction. Moreover, by adjusting the gas or liquid filled inside the hollow fiber, the desired dispersion and nonlinear polarization characteristics can be customized very easily. Therefore, since the birth of hollow fiber, it has been applied in many fields such as ultrashort pulse wavelength conversion [1], vacuum ultraviolet radiation generation [2], spatiotemporal self-compression, and high-order harmonic generation [3]. When high-power, high-repetition-rate femtosecond lasers are coupled to the end face of hollow fiber, the coupling loss causes useless heat accumulation on the end face of the hollow fiber, which damages the end face of the hollow fiber, reduces the coupling efficiency, and affects pulse compression. However, most fiber water cooling devices are based on water-cooled plates (Chinese utility model patent CN214124306U). The main body of the femtosecond pulse compressor is a special hollow fiber - capillary. Capillary fibers suffer from significant bending losses and cannot be bent during operation. Existing water-cooled plate structures are only suitable for flexible optical fibers, not for inflexible capillary fibers, and therefore cannot be directly applied in this scenario. Femtosecond pulse compressors using capillary fibers as the main component require spatial optical path coupling, and the coupling end face is where heat accumulation is most severe. Furthermore, due to mode dissipation within the capillary, overall cooling is not required, which is inconsistent with existing water-cooling solutions. Current water-cooling devices can only cool the entire fiber and cannot specifically cool the end face (Chinese Invention Patent Application CN111082289A). Existing water-cooling channel designs primarily focus on maximizing cooling performance. However, maximizing cooling efficiency does not consider the impact of vibrations caused by coolant flow on system stability. In particular, spatially optically coupled capillary compressors are highly sensitive to vibration. Existing devices do not have special designs for vibrations caused by coolant flow in water cooling systems, while stable operation of spatially optically coupled capillary compressors requires the avoidance of vibration.

[0004] Therefore, how to solve the problem of heat accumulation caused by coupling loss in high-power femtosecond laser pulse compressors, and how to achieve cooling of the coupling end face while suppressing high-frequency vibration caused by coolant flow, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a low-vibration water-cooling device for a high-repetition-rate femtosecond pulse compressor capillary fiber, addressing the problems in the prior art.

[0006] Therefore, the above-mentioned objectives of the present invention are achieved through the following technical solutions:

[0007] A low-vibration water-cooling device for capillary optical fibers of high-repetition-rate femtosecond pulse compressors is disclosed for cooling the fiber end face of high-power capillary optical fiber femtosecond pulse compressors. The device comprises a mounting groove and a water-cooling jacket. The water-cooling jacket is installed in the mounting groove and fixedly mounted therethrough. The water-cooling jacket includes a water-cooling sleeve and a flow-disrupting element. The flow-disrupting element is fixedly installed inside the water-cooling jacket. The flow-disrupting element includes an intermediate shaft and several flow-disrupting fins disposed on the outer wall of the intermediate shaft. An optical fiber mounting hole is axially disposed on the intermediate shaft. A cavity is reserved between the flow-disrupting fins and the inner wall of the water-cooling sleeve to accommodate heat-conducting fluid. The cavity connects to the inlet and outlet of the heat-conducting fluid. Flow-disrupting wires are placed at the inlet and outlet according to the Reynolds number of the flow field, wherein the flow-disrupting wires are positioned perpendicular to the flow direction of the heat-conducting fluid.

[0008] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0009] As a preferred technical solution of the present invention: the turbulence fins are distributed along an axial spiral involute to enhance the turbulence effect;

[0010] Alternatively, four fins are arranged along the outer periphery of the central axis of the spoiler, and the dimension of the axial helical involute of the fins is the same as the length of the spoiler in the axial direction.

[0011] As a preferred technical solution of the present invention: the inner wall of one side of the water-cooled jacket is provided with threads, and the turbulence fin is provided with an external threaded connector on the matching side. The water-cooled jacket and the turbulence fin are assembled and fixed by threads.

[0012] As a preferred embodiment of the present invention: the diameter of the optical fiber mounting hole is equal to the outer diameter of the capillary optics;

[0013] The capillary optical fiber is stabilized and vacuum-mounted by filling the optical fiber mounting hole with vacuum adhesive.

[0014] As a preferred technical solution of the present invention: the inlet and outlet of the heat-conducting fluid are inlet pipes and outlet pipes installed on the mounting groove, and the inlet pipes and outlet pipes are provided with turbulence wires.

[0015] As a preferred technical solution of the present invention: the mounting groove is provided with a receiving part to hold the heat-conducting fluid, and the outer wall of the mounting groove is provided with a first through hole and a second through hole. The receiving part is connected to the first through hole and the inlet pipe. The flow directions of the first through hole and the inlet pipe are not in the same direction. The heat-conducting fluid enters the receiving part through the first through hole, and after entering the receiving part, it turns and enters the inlet pipe and overflows into the chamber.

[0016] The outlet is connected to the second through hole. After the heat transfer fluid exchanges heat in the chamber, it exits through the outlet and the second through hole.

[0017] As a preferred technical solution of the present invention: the number of the turbulence wires should be greater than 5, the diameter of the turbulence wires should be determined by dividing the diameter of the water-cooled jacket inlet and outlet by the Reynolds number of the flow field, the angle of the distribution of the turbulence wires should be expanded according to a linear function, and the installation intervals should be evenly distributed along the length of the nylon tube.

[0018] As a preferred embodiment of the present invention, the inlet and outlet of the heat-conducting fluid are provided on the mounting groove, and the inlet and outlet are provided with turbulence wires.

[0019] The mounting groove is provided with a receiving part to hold the heat-conducting fluid, and the outer wall of the mounting groove is provided with a first through hole and a second through hole. The receiving part is connected to the first through hole and the inlet pipe. The flow directions of the first through hole and the inlet pipe are not in the same direction. The heat-conducting fluid enters the receiving part through the first through hole, and after entering the receiving part, it turns and enters the inlet pipe before overflowing into the chamber.

[0020] The outlet is connected to the second through hole. After the heat transfer fluid exchanges heat in the chamber, it exits through the outlet and the second through hole.

[0021] As a preferred technical solution of the present invention: the number of the turbulence wires should be greater than the specified value, the diameter of the turbulence wires should be determined by dividing the diameter of the water-cooled jacket inlet and outlet by the Reynolds number of the flow field, the angle of the distribution of the turbulence wires should be expanded according to a linear function, and the installation intervals should be evenly distributed along the length of the nylon tube.

[0022] As a preferred technical solution of the present invention, the turbulence wire is made of corrosion-resistant material, such as nylon.

[0023] As a preferred technical solution of the present invention: the mounting groove is a semi-circular base, the water-cooling sleeve is installed in the semi-circular groove of the mounting groove and fixed with a pressure block, the pressure block is a semi-circular base like the mounting groove, and is fixedly installed relative to the mounting groove to tighten the water-cooling sleeve.

[0024] As a preferred embodiment of the present invention, the space between the water-cooled sleeve and the mounting groove is filled with vacuum thermally conductive silicone grease to improve thermal contact.

[0025] As a preferred technical solution of the present invention, the water-cooling sleeve is made of copper.

[0026] This invention discloses a low-vibration water-cooling device for capillary optical fibers in high-repetition-rate femtosecond pulse compressors, used for cooling the end face of the fiber in a high-power capillary optical fiber femtosecond pulse compressor. The invention includes a water-cooling sleeve made of copper, with a specially shaped finned flow disruptor inside. The flow disruptor has a central optical fiber mounting hole. At least five flow disruptor wires, made of nylon and installed in a nylon tube, are placed at a certain non-uniform angle at the coolant inlet and outlet of the water-cooling sleeve. The water-cooling sleeve is connected to a bottom semi-circular mounting groove via a quick-connect interface. A vacuum water-cooling interface is installed at the bottom of the semi-circular mounting groove, and vacuum thermally conductive silicone grease is filled between the water-cooling sleeve and the semi-circular mounting groove.

[0027] Furthermore, the water-cooled jacket consists of two parts: a water-cooled jacket outer shell and an internal baffle containing baffle fins.

[0028] Furthermore, the center of the spoiler includes a central fiber optic mounting hole, the diameter of which should be equal to the outer diameter of the capillary tube. Stable installation and vacuum are achieved by installing the capillary fiber optic tube using vacuum adhesive.

[0029] Furthermore, the spoiler fins are distributed along an axial spiral involute, and the spoiler fins can be selected to be machined from a single material with the housing or connected by threads.

[0030] Furthermore, turbulence-inducing wires need to be placed at the refrigerant inlet and outlet of the water-cooled jacket.

[0031] Furthermore, the number, diameter, and distribution of the turbulence filaments were designed using finite element simulation.

[0032] Furthermore, the number of baffles should be greater than 5, and the diameter of the baffles should be determined by dividing the inlet and outlet diameter of the water-cooled jacket by the Reynolds number of the flow field. The distribution angle of the baffles should be expanded according to a linear function, and the installation intervals should be evenly distributed along the length of the nylon tube.

[0033] Furthermore, the turbulence wire should be made of corrosion-resistant material, such as nylon.

[0034] Furthermore, the baffle wire can be installed at the inlet and outlet of the water-cooled pipe by welding or the pipe with the baffle wire can be fabricated as a whole by 3D printing.

[0035] Furthermore, the water-cooling jacket is directly connected to the semi-circular mounting base via a quick-connect interface to allow refrigerant to flow in and out.

[0036] Furthermore, the refrigerant can be a heat-conducting fluid such as deionized water or antifreeze. The heat generated by the capillary optical fiber is conducted to the turbulence-disrupting element, which is completely immersed in the coolant. The circulating coolant can quickly remove the heat generated by the optical fiber during operation.

[0037] Furthermore, vacuum thermal grease needs to be filled between the water-cooling jacket and the mounting base to improve thermal contact.

[0038] Compared with existing technologies, this invention provides a low-vibration water-cooling device for capillary optical fibers in high-repetition-rate femtosecond pulse compressors. It utilizes a combination of a water-cooling jacket and a turbulence-inducing element to achieve turbulent heat exchange cooling within the cavity. By creating fiber mounting holes in the turbulence-inducing element, the water-cooling device can be applied to inflexible capillary optical fibers. Furthermore, by installing the capillary optical fiber primarily at the end face, targeted cooling of the coupling end face can be achieved, meeting the requirements for end-face water cooling. Simultaneously, the design of multiple turbulence-inducing elements effectively suppresses vibrations caused by the coolant flow field, significantly reducing vibration-induced damage and improving the stability of high-power capillary optical fibers. In this invention, when the coolant enters the cooling jacket from the inlet, the turbulence-inducing wires impede the flow field, suppressing turbulence formation. Simultaneously, the uneven distribution of the turbulence-inducing wires disrupts the periodicity of the vortex separation force. The turbulence-inducing fins inside the water-cooling jacket are streamlined with a special angle of rotation, which can suppress vibrations caused by the coolant flow. This invention has significant application value in the cooling field of high-power ultrawide lasers. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the low-vibration water-cooling device for the high-repetition-rate femtosecond pulse compressor capillary fiber of the present invention. Figure 1 ;

[0040] Figure 2 for Figure 1 Sectional view along axis AA;

[0041] Figure 3 This is a schematic diagram of the overall structure of the low-vibration water-cooling device for the high-repetition-rate femtosecond pulse compressor capillary fiber of the present invention. Figure 2 ;

[0042] Figure 4 This is an exploded schematic diagram of the low-vibration water-cooling device for the capillary fiber of the high-repetition-rate femtosecond pulse compressor of the present invention.

[0043] Figure 5 A schematic diagram of the water-cooled jacket's airflow deflector;

[0044] Figure 6 This is a schematic diagram of the structure of the inlet pipe and the outlet pipe;

[0045] Figure 7 This is a schematic diagram showing the distribution of the turbulence wires in the inlet and outlet pipes from another perspective.

[0046] Figure 8 A schematic diagram of the structure of the semi-circular mounting base for the mounting slot;

[0047] Figure 9This is a comparison diagram of the vibration pressure before and after using the swerve and swerve components of the present invention;

[0048] In the attached diagram, 1 is a water-cooled jacket; 2 is a flow-dispersing component; 201 is an intermediate shaft; 202 is an external threaded connector; 3 is an outlet; 4 is an inlet; 5 is a mounting groove; 6 is a flow-dispersing fin; 7 is an optical fiber mounting hole; 8 is a nylon tube; 9 is a flow-dispersing wire; 10 is a chamber; and 11 is a pressure block. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0050] This invention discloses a low-vibration water-cooling device for capillary optical fibers in a high-repetition-rate femtosecond pulse compressor, used to cool the fiber end face of a high-power capillary optical fiber femtosecond pulse compressor. The device includes a mounting groove 5 and a water-cooling jacket. The water-cooling jacket is installed in the mounting groove 5 and fixedly installed through the mounting groove 5. The water-cooling jacket includes a water-cooling sleeve 1 and a flow-disrupting element 2. The flow-disrupting element 2 includes an intermediate shaft 201 and a few flow-disrupting fins 6 disposed on the outer wall of the intermediate shaft. An optical fiber mounting hole 7 is axially disposed on the intermediate shaft 201. A cavity 10 is reserved in the inner wall of the water-cooling sleeve 1 to accommodate heat-conducting fluid. The cavity 10 is connected to the inlet and outlet of the heat-conducting fluid. Flow-disrupting wires 9 are placed at the inlet and outlet according to the Reynolds number of the flow field, wherein the flow-disrupting wires 9 are disposed in the direction perpendicular to the flow direction of the heat-conducting fluid.

[0051] The inner wall of the water-cooled jacket 1 is threaded on one side, and the turbulence fin 6 is provided with an external threaded connector on the matching side. The water-cooled jacket 1 and the turbulence fin 2 are assembled and fixed by the threads.

[0052] The turbulence-involute fins 6 are distributed along an axial spiral involute to enhance the turbulence effect.

[0053] Four turbulence fins 6 are arranged along the outer periphery of the central axis 201 of the turbulence component 2. The axial spiral involute dimension of the turbulence fins 6 is the same as the length of the turbulence component in the axial direction, which suppresses the vibration caused by the refrigerant flowing through.

[0054] The diameter of the fiber mounting hole 7 is equal to the outer diameter of the capillary optics.

[0055] The capillary optical fiber is stabilized and vacuum-mounted by filling the optical fiber mounting hole 7 with vacuum adhesive.

[0056] The inlet 3 and outlet 4 of the heat transfer fluid are respectively installed on the mounting groove 5 as the inlet pipe and the outlet pipe. The inlet pipe and the outlet pipe are made of nylon pipe 8, and the inlet pipe and the outlet pipe are equipped with baffles 9.

[0057] The mounting groove 5 is provided with a receiving part 501 to hold the heat-conducting fluid, and the outer wall of the mounting groove 5 is provided with a first through hole 502 and a second through hole 503. The receiving part 501 is connected to the first through hole 502 and the inlet pipe. The flow directions of the first through hole and the inlet pipe are not in the same direction. The heat-conducting fluid enters the receiving part 501 through the first through hole 502, and after entering the receiving part 501, it turns and enters the inlet pipe and overflows into the chamber.

[0058] The outlet pipe is connected to the second through hole 503. After the heat transfer fluid exchanges heat in the chamber, it is discharged through the outlet pipe and the second through hole 503.

[0059] In this invention, the inclusion portion 501 provides space for the heat-conducting fluid to flow slowly into the chamber 10. Simultaneously, by utilizing the fact that the liquid flow directions of the first through-hole 502 and the inlet pipe are not in a straight line, the vibration of the femtosecond pulse compressor caused by the direct influx of the heat-conducting fluid into the chamber is mitigated through the detour of the heat-conducting fluid. Furthermore, the design of the inlet pipe with a certain length and the inclusion of the internal turbulence wire 9 allow the heat-conducting fluid to overflow into the chamber after the detour, further reducing the vibration of the femtosecond pulse compressor caused by the direct influx into the chamber. This effectively suppresses the vibration caused by the heat-conducting medium and refrigerant, greatly reducing damage caused by vibration and improving the stability of the high-power capillary optical fiber.

[0060] The number of the baffle wires 9 should be greater than 5. The diameter of the baffle wires should be determined by dividing the diameter of the water-cooled jacket inlet and outlet by the Reynolds number of the flow field. The angle of the baffle wire distribution should be expanded according to a linear function. The installation intervals should be evenly distributed along the length of the nylon tube.

[0061] The turbulence wire is made of corrosion-resistant material, such as nylon.

[0062] Mounting slot 5 uses a semi-circular base, and the water-cooling sleeve is installed inside the semi-circular slot of mounting slot 5. The clamping block also uses a semi-circular base, and is fixedly installed relative to the mounting slot, thereby tightening the water-cooling sleeve.

[0063] The water-cooled sleeve and the mounting groove are fastened together using a clamping block 11 and vacuum thermal grease is filled between their contact surfaces to improve thermal contact.

[0064] The water-cooling sleeve is made of copper.

[0065] Compared with the prior art, the beneficial effects of the low-vibration water-cooling device for capillary optical fiber of high repetition rate femtosecond pulse compressor of the present invention are as follows:

[0066] First, this invention addresses the cooling requirements of conventional cooling schemes for the capillary fiber end face of high-repetition-rate femtosecond pulse compressors. By combining a water-cooling jacket and a baffle plate, and using fiber mounting holes on the baffle plate, it can be applied to inflexible capillary fibers. Furthermore, since the capillary fiber is primarily mounted at the end face, targeted cooling of the coupling end face is possible.

[0067] Second, this invention employs numerous flow-disrupting designs, which effectively suppress vibrations caused by the refrigerant flow field. This improves system stability and avoids stability degradation in the capillary fiber spatial coupling section.

[0068] Third, this invention can be widely applied to various high-power devices based on capillary optical fibers, which is beneficial to improving the stability and reliability of high-power capillary optical fiber systems: This invention cools the end face of the capillary optical fiber, which can quickly remove the heat generated by coupling loss, greatly reduce the possible damage to various components of the fiber laser caused by thermal load, and greatly improve the stability of high-power capillary.

[0069] Example 1

[0070] like Figures 1-9 As shown, this invention discloses a low-vibration water-cooling device for a high-repetition-rate femtosecond pulse compressor capillary fiber. The device comprises a water-cooling jacket (water-cooling sleeve 1) and a flow-dispersing element (flow-dispersing element 2). The water-cooling jacket is machined from a single piece of copper using a CNC machine tool, avoiding issues of reduced sealing and service life caused by threaded assembly. A heat-conducting medium (refrigerant) flows into the water-cooling jacket through inlet 3. After overflowing into chamber 10, the refrigerant forms a cooling flow field between the inner wall of the water-cooling sleeve 1 and the flow-dispersing element 2 before flowing out through outlet 4. The refrigerant can be deionized water, antifreeze, or other heat-conducting fluids. The water-cooling jacket is mounted on a mounting groove 5 of a semi-circular base at the bottom, connected via a quick-connect interface. Thermal grease is used to fill the gap between the two to improve thermal contact performance. Quick-connect interfaces are provided on the outer walls of the inlet and outlet pipes, which are inserted into the semi-circular base to fix the water-cooling sleeve 1 in the mounting groove 5. The dimensions of the water-cooled jacket 1 and the baffle 2 need to be designed according to the specific heat dissipation power. In this embodiment, the input laser power is 60W and the coupling efficiency is 60%, therefore the heat dissipation power is 24W. When using deionized water as the coolant, considering the heat capacity of water, only a shell diameter of 2mm and a length of 5mm are needed to meet the cooling requirements of the end face. The dimensions of the inlet 3 and outlet 4 can be determined according to the inner diameter of the quick-connect interface used, and the inlet 3 and outlet 4 need to completely cover the quick-connect interface. In this example, a translation stage is also added to the semi-circular base for convenient coupling.

[0071] Reference Figure 5The flow damper 2 includes special flow damping fins 6. These fins are distributed along an axial spiral involute, with four fins arranged around the outer periphery of the central axis 201 of the flow damper. The involute dimension of the fins 6 is the same as the axial length of the flow damper 2. Generally, the relative rotation angle between the upper and lower surfaces of the flow damper should not exceed 45°, otherwise it will cause difficulties in machining and result in an uneven cooling flow field. The flow damper 2 contains a central fiber optic mounting hole 7. The diameter of the mounting hole 7 should be equal to the outer diameter of the capillary tube. Stable installation and vacuum are achieved by installing the capillary fiber optic cable using vacuum adhesive.

[0072] Reference Figure 6 and Figure 7 A flow-deflecting wire 9 is placed in the refrigerant inlet 3 and outlet 4 of the water-cooled jacket. In this embodiment, the flow-deflecting wire is not assembled by welding, but is instead manufactured as a single 3D-printed nylon tube 8. The number, diameter, and distribution of the flow-deflecting wire 9 are designed through finite element simulation. In this embodiment, the number of flow-deflecting wires 9 should be 5, and the diameter of the flow-deflecting wire is determined by dividing the inlet and outlet diameter of the water-cooled jacket by the Reynolds number of the flow field. (Refer to...) Figure 4 The angle of the distribution of the turbulence wires 9 unfolds according to a linear function, and the installation intervals are evenly distributed along the length of the nylon tube 8.

[0073] Reference Figure 8 The semi-circular mounting base of mounting slot 5 is hollow inside, and has refrigerant inlet and outlet.

[0074] Reference Figure 9 The dimensionless pressure spectrum of the surface, where dimensionless refers to normalization of the maximum pressure on the inner surface of the water-cooled jacket 1, showed a significant change. A noticeable decrease in the dimensionless pressure spectrum and its width was observed. This decrease in the dimensionless pressure spectrum indicates that vibrations caused by the refrigerant flow are suppressed, particularly high-frequency cooling vibrations. This invention provides a low-vibration water-cooling device for a high-repetition-rate femtosecond pulse compressor capillary fiber, which can meet the water-cooling requirements of the capillary end face of the femtosecond pulse compressor. Furthermore, the dimensionless pressure spectrum on the inner surface of the water-cooled jacket changed significantly before and after application, showing a significant decrease in the dimensionless pressure spectrum and its width. This decrease in the dimensionless pressure spectrum indicates that vibrations caused by the refrigerant flow are suppressed, particularly high-frequency cooling vibrations.

[0075] The water-cooling jacket described in this invention can be machined from a single piece of copper using a CNC machine tool to create the internal baffles and outer shell. This machining method improves the sealing performance and service life of the water-cooling jacket. The baffle wires described in this invention can be 3D printed into an integral tube containing the baffle wires. This manufacturing method is easy to install, stable in use, and can withstand long-term refrigerant impact. The high thermal conductivity thermal grease described in this invention is a vacuum thermal grease to ensure vacuum performance and high heat dissipation efficiency.

[0076] The above specific embodiments are used to explain and illustrate the present invention, and are only preferred embodiments of the present invention, not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A low-vibration water-cooling device for capillary optical fibers in high-repetition-rate femtosecond pulse compressors, used for cooling the fiber end face of high-power capillary femtosecond pulse compressors, characterized in that: The device comprises a mounting groove, a water cooling jacket, the water cooling jacket is mounted in the mounting groove and fixedly installed through the mounting groove, the water cooling jacket comprises a water cooling jacket pipe and a spoiler fixedly installed in the water cooling jacket, the spoiler comprises an intermediate shaft and a plurality of spoiler fins provided on the outer wall of the intermediate shaft, an optical fiber mounting hole is provided on the intermediate shaft in the axial direction, the spoiler fins accommodate a heat-conducting fluid in the reserved chamber of the inner wall of the water cooling jacket pipe, and the chamber is communicated with the inlet and outlet of the heat-conducting fluid, and the spoiler wires are placed in the inlet and outlet according to the flow field Reynolds number, wherein the spoiler wires are arranged in the vertical direction of the flow direction of the heat-conducting fluid; The inlet and outlet of the heat-conducting fluid are an inlet pipe and an outlet pipe mounted on the mounting groove, and spoiler wires are arranged in the inlet pipe and the outlet pipe; The mounting groove is provided with a containing part for accommodating the heat-conducting fluid, and a first through hole and a second through hole are provided on the outer wall of the mounting groove, the containing part is communicated with the first through hole and the inlet pipe, the flow directions of the first through hole and the inlet pipe are not in the same direction, the heat-conducting fluid enters the containing part through the first through hole, and then enters the inlet pipe after turning and then overflows into the chamber; The outlet is communicated with the second through hole, and the heat-conducting fluid is discharged through the outlet and the second through hole after heat exchange in the chamber.

2. The low-vibration water-cooling device for high-repetition-rate femtosecond pulse compressor capillary fiber according to claim 1, characterized in that: The spoiler fins are distributed along the axial spiral involute to improve the spoiler effect; Or, four spoiler fins are arranged along the outer periphery of the central shaft of the spoiler, and the size of the axial spiral involute of the spoiler fins is the same as the length of the spoiler in the axial direction.

3. The low-vibration water-cooling device for high-repetition-rate femtosecond pulse compressor capillary fiber according to claim 1, characterized in that: The inner wall of one side of the water cooling jacket pipe is provided with a thread, the spoiler fin is provided with an external thread connecting piece on the matched side, and the water cooling jacket pipe and the spoiler are assembled and fixed through the thread.

4. The low-vibration water-cooling device for high-repetition-rate femtosecond pulse compressor capillary fiber according to claim 1, characterized in that: The diameter of the optical fiber mounting hole is equal to the outer diameter of the capillary tube; The optical fiber mounting hole is filled with vacuum adhesive to stabilize and vacuum install the capillary optical fiber.

5. The low-vibration water-cooling device for high-repetition-rate femtosecond pulse compressor capillary fiber according to claim 1, characterized in that: The number of spoiler wires is greater than 5, the diameter of the spoiler wire should be determined according to the diameter of the inlet and outlet of the water cooling jacket divided by the flow field Reynolds number, the distribution angle of the spoiler wire should be expanded according to the linear function, and the installation interval is equally distributed along the length direction of the nylon pipe.

6. The low-vibration water-cooling device for high-repetition-rate femtosecond pulse compressor capillary fiber according to claim 1, characterized in that: The spoiler wire is made of nylon material.

7. The low-vibration water-cooling device for high-repetition-rate femtosecond pulse compressor capillary fiber according to claim 1, characterized in that: The mounting groove selects a semicircular base, the water cooling jacket pipe is installed in the semicircular groove of the mounting groove and fixed by using a pressing block, the pressing block also selects a semicircular base and is fixedly installed opposite to the mounting groove to clamp the water cooling jacket.

8. The low-vibration water-cooling device for high-repetition-rate femtosecond pulse compressor capillary fiber according to claim 6, characterized in that: Vacuum heat-conducting silicone grease is filled between the water cooling jacket pipe and the mounting groove to improve the thermal contact.

Images