Transmissive water-cooled high-power laser collection device

Abstract

The application discloses a kind of transmission type water-cooled high-power laser collection devices, it is related to photoelectric instrument technical field, including: light-receiving cylinder, for one end having opening sealed cylinder, the cylinder wall of light-receiving cylinder is equipped with with its inner cavity communication liquid inlet and liquid outlet, for connecting external circulation pipeline, to form the cooling liquid circulation path that flows through inner cavity;Light-transmitting piece, sealing cover is located in the opening end of light-receiving cylinder, light-transmitting piece and cooling liquid in the inner cavity of light-receiving cylinder are sequentially arranged along laser incidence direction, so that the laser to be collected can be transmitted through light-transmitting piece, directly incident into cooling liquid and be absorbed.The device can directly, efficiently handle high-power laser residual energy and structure is more reliable.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic instrument technology, and more specifically, to a transmission-type water-cooled high-power laser collection device. Background Technology

[0002] During the integration, assembly, and testing of high-power laser systems in the laboratory, residual laser light at the end of the optical path needs to be collected and cooled to prevent damage to personnel and equipment. Traditional laser collection devices generally employ a solution of reflection and metal heat conduction, typically consisting of a beam splitter and a cylindrical tube surrounding the beam splitter. During operation, the incident laser light is reflected by the beam splitter and dispersed onto the cylindrical wall, which usually has a serrated structure to increase diffuse reflection. The cylindrical wall absorbs laser energy, generating heat, which is then cooled by circulating cooling water, thus achieving heat exchange of laser energy. However, this traditional solution has the following drawbacks:

[0003] Laser energy undergoes multiple processes, including reflection by a beam splitter, absorption by the metal cylinder wall, conduction through the metal cylinder wall, and finally being carried away by cooling water. The laser energy replacement path is lengthy and the replacement efficiency is low, making it difficult to meet the cooling replacement requirements of higher laser power in a short period of time.

[0004] The beam splitter itself also requires water cooling, which increases the complexity of the structure and manufacturing cost. Moreover, the energy is highly concentrated at the tip of the beam splitter, making it extremely susceptible to deformation or damage due to heat accumulation. Once the tip fails, its beam splitting function deteriorates, leading to a sharp decline in the heat dissipation performance of the entire device and poor reliability.

[0005] Therefore, how to solve the problems of long and inefficient heat dissipation paths and complex and easily damaged beam splitters in traditional laser collection devices is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a transmissive water-cooled high-power laser collection device that can directly and efficiently process the residual energy of high-power lasers and has a more reliable structure.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A transmission-type water-cooled high-power laser collection device, comprising:

[0009] A light-collecting tube is a sealed cylinder with an opening at one end. The cylinder wall of the light-collecting tube is provided with an inlet and an outlet that communicate with its inner cavity, for connecting to an external circulation pipeline to form a coolant circulation path flowing through the inner cavity.

[0010] A light-transmitting element and a sealing cover are provided at the open end of the light-collecting tube. The light-transmitting element and the coolant in the inner cavity of the light-collecting tube are arranged sequentially along the laser incident direction, so that the laser to be collected can be transmitted through the light-transmitting element and directly incident into the coolant to be absorbed.

[0011] Preferably, it further includes a light-resistant backplate, which is disposed on the inner side of the other end of the light-collecting tube opposite to its opening end and is disposed opposite to the light-transmitting element, for absorbing the residual laser energy transmitted through the coolant.

[0012] Preferably, the light-resistant backplate is made of a material with high temperature resistance and high thermal conductivity, and / or the light-collecting tube is made of a material with high thermal conductivity.

[0013] Preferably, the light-transmitting element is an intensifying lens, which is set at an angle to the laser incident direction to prevent the reflected light from its surface from returning along the original path.

[0014] Preferably, it further includes a light shield, which is fitted over the outside of the open end of the light-collecting tube. The inner wall of the light shield has a serrated structure for diffuse reflection and absorption of stray light reflected from the surface of the intensifying lens.

[0015] Preferably, it further includes:

[0016] A light shield front plate is located at the front end of the light shield away from the light collecting tube, and a light-passing hole for laser to pass through is provided at the center of the light shield front plate;

[0017] The centering target plate is detachably mounted on the front plate of the light shield and covers the light-transmitting hole. The centering target plate is provided with a target ring for aligning with the laser spot.

[0018] Preferably, the front panel of the light shield is provided with a slot, and the centering and calibration target plate is a plurality of target rings with different diameters, and the plurality of centering and calibration target plates can be selectively inserted into the slot.

[0019] Preferably, the intensifying lens is disposed at the open end of the light-collecting tube via a detachable sealing structure;

[0020] The centering and calibration target plate is provided with a storage structure for accommodating the intensifying lens. When the intensifying lens is removed from the light-collecting tube, it can be placed in the storage structure.

[0021] Preferably, the highest point of the light-collecting tube is provided with an exhaust hole, which is sealed by a plug when the inner cavity is filled with coolant.

[0022] Preferably, it further includes a control system, the control system comprising:

[0023] A temperature sensor is installed in an external pipeline connected to the liquid outlet to monitor the temperature of the coolant flowing out of the light-collecting tube.

[0024] A flow regulating device is provided in the coolant circulation path to regulate the flow rate of coolant flowing through the inner cavity;

[0025] The controller is electrically connected to the temperature sensor and the flow regulating device. When the temperature monitored by the temperature sensor exceeds a first preset threshold, the controller controls the flow regulating device to increase the coolant flow rate; when the temperature is lower than a second preset threshold, the controller controls the flow regulating device to decrease the coolant flow rate.

[0026] The beneficial effects of the transmissive water-cooled high-power laser collection device provided by this invention are as follows: the high-power laser is transmitted through the light-transmitting element and directly incident into the coolant, rapidly transferring the heat generated by irradiation to the cooling water, which is then carried away by the continuously flowing coolant, thereby achieving efficient heat exchange and meeting the heat dissipation requirements of higher-power lasers. Simultaneously, the complex and easily damaged beam splitter and its internal coolant required in traditional devices are eliminated, resulting in a simpler and more reliable device structure and reduced maintenance costs. Furthermore, since the laser beam is directly incident into the coolant and absorbed after sequentially transmitting through the light-transmitting element, the transmission path of the main laser beam is clear and its endpoint is definite (terminating in the coolant). Compared to traditional reflective schemes, this reduces the risk of uncontrollable direction and escape caused by multiple diffuse reflections of the laser. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the transmissive water-cooled high-power laser collection device provided by the present invention.

[0029] Figure 2 This is a partial cross-sectional view of the transmission-type water-cooled high-power laser collecting device provided by the present invention.

[0030] Figure label:

[0031] 1-Light-collecting tube; 2-Inner cavity; 3-Light-transmitting component; 4-Liquid inlet valve; 5-Liquid outlet valve; 6-Exhaust vent; 7-Light-resistant back plate; 8-Light shield; 9-Serrated structure; 10-Front plate of light shield; 11-Centering and calibration target plate. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The core of this invention is to provide a transmissive water-cooled high-power laser collection device, which can directly and efficiently process the residual energy of high-power lasers and has a more reliable structure.

[0034] Please refer to Figure 2 This embodiment provides a transmissive water-cooled high-power laser collecting device, including a light-collecting tube 1 and a light-transmitting element 3.

[0035] The light-collecting tube 1 is a sealed cylinder with an opening at one end. The inner cavity 2 of the light-collecting tube 1 is used to contain flowing coolant. The cylinder wall of the light-collecting tube 1 is provided with an inlet and an outlet communicating with its inner cavity 2, for connecting to an external coolant circulation pipeline (not shown in the figure), thereby forming a closed circulation path flowing through the inner cavity 2 of the light-collecting tube 1. The coolant is preferably pure water or deionized water with a high absorption coefficient for the target laser wavelength (e.g., 1070nm).

[0036] The light-transmitting element 3 is preferably a glass plate with high transmittance and high laser damage threshold. The shape of the light-transmitting element 3 matches the opening end of the light-collecting tube 1. It is fixed to the opening end of the light-collecting tube 1 by sealing rings (such as O-rings) and pressure rings to ensure that the coolant does not leak.

[0037] It should be noted that, Figure 2 The direction indicated by arrow A is the laser incident direction. Viewed from the incident direction of the laser (which is the residual high-power laser generated by a high-power laser system, located at the end of the high-power laser assembly and testing optical path), the light-transmitting element 3 is located in front of the coolant in the inner cavity 2 of the light-collecting tube 1. This means that the laser must first pass through the light-transmitting element 3 before it can directly act on the coolant.

[0038] In this embodiment, when the device is in operation, coolant is injected into the inner cavity 2 through the inlet until the coolant fills the entire inner cavity 2 and flows out steadily from the outlet, ensuring that there is no residual air in the cavity. Subsequently, the external circulation cooling system is activated to allow the coolant to flow continuously in the inner cavity 2.

[0039] When high-power laser collection is required, the laser beam to be processed is aligned and incident on the light-transmitting component 3. After the laser beam passes through the light-transmitting component 3, it is directly incident on the coolant in the inner cavity 2 of the light-collecting cylinder 1. The laser energy is absorbed by the coolant and then carried away by the continuously flowing coolant through the circulation path formed by the inlet and outlet, achieving efficient heat exchange.

[0040] Therefore, the device of this embodiment has the following effects:

[0041] The long path of relying on beam splitter reflection and heat conduction through the metal cylinder wall in traditional devices is eliminated. The high-power laser to be collected is directly transmitted into the coolant for absorption, avoiding the huge thermal resistance caused by the heat conduction through the metal cylinder wall. This allows the laser heat to be carried away by the flowing coolant in an instant, thereby achieving efficient heat exchange and meeting the heat dissipation requirements of higher power lasers.

[0042] The complex and easily damaged beam splitter and its internal coolant, which are required in traditional devices, have been eliminated. This avoids the problem of deformation or damage caused by the concentration of energy at the tip of the beam splitter, making the device structure simpler and more reliable, while reducing maintenance costs.

[0043] In traditional reflective laser schemes, the direction of the laser beam is uncontrollable after reflection by the beam splitter, posing a certain risk of stray light escape. In this device, the laser beam is directly absorbed into the coolant after passing through the light-transmitting element 3 in sequence. This ensures a clear transmission path and a definite endpoint (terminating in the coolant), reducing the risk of uncontrollable direction and escape caused by multiple diffuse reflections of the laser.

[0044] Based on the above embodiments, as a further preferred option, please refer to... Figure 2 The inlet and outlet are equipped with an inlet valve 4 and an outlet valve 5, respectively, both of which can be manual ball valves or solenoid valves. The inlet end of the inlet valve 4 is used to connect to the external water supply pipeline, and the outlet end of the outlet valve 5 is used to connect to the external return water pipeline. By directly operating these two valves, the flow path of coolant to the inner cavity 2 of the light-collecting cylinder 1 can be easily opened or closed.

[0045] Based on the above embodiments, as a further preferred option, please refer to... Figure 2 The transmissive water-cooled high-power laser collecting device also includes a light-resistant backplate 7, which is located on the inner side of the other end of the light-collecting tube 1 opposite to its opening end and is positioned opposite to the light-transmitting element 3, and is used to absorb the residual laser energy transmitted through the coolant.

[0046] The light-resistant backing plate 7 preferably forms the wall of the other end of the light-collecting tube 1, making that end a closed end. The light-resistant backing plate 7 and the light-transmitting element 3 are arranged opposite each other along the central axis of the light-collecting tube 1.

[0047] When the device is working, most of the laser energy is directly absorbed and carried away by the coolant flowing through the inner cavity 2 after passing through the light-transmitting element 3. However, a very small portion of the laser energy (residual energy) may still penetrate a certain thickness of coolant and directly hit the other end of the light-collecting tube 1. The light-resistant backplate 7 can effectively absorb the residual laser energy, and then, through its own high thermal conductivity, it can be quickly conducted to the coolant in contact with it, and finally carried away by the circulating coolant.

[0048] Therefore, the addition of the light-resistant backplate 7 can absorb the residual energy of the laser, effectively avoiding the risk of high-power laser damaging the light-collecting tube 1 after penetrating the coolant, and quickly dissipating the absorbed heat through its high thermal conductivity, thereby improving the safety and reliability of the device in collecting high-power laser.

[0049] The light-resistant backplate 7 is preferably made of a high-temperature resistant and high-thermal-conductivity material, such as zirconia ceramic, which has an extremely high melting point and excellent thermal conductivity. This ensures that the light-resistant backplate 7 is not prone to thermal damage when absorbing high-energy-density residual lasers, and can quickly transfer the absorbed heat to the coolant to avoid local overheating, thus ensuring a long service life and efficient heat dissipation of the light-resistant backplate 7.

[0050] Furthermore, the light-collecting tube 1 is made of a material with high thermal conductivity, such as aluminum alloy, so that the stray light heat absorbed by the inner wall of the light-collecting tube 1 can be directly transferred to the coolant flowing in the inner cavity 2 through the conduction characteristics of the tube wall itself, thereby improving the energy replacement efficiency of the device for stray light, while preventing heat accumulation that could cause the tube to deform.

[0051] Based on the above embodiments, as a further preferred option, please refer to... Figure 2 The light-transmitting element 3 is an intensifying lens, which is set at an angle to the laser incident direction to prevent the reflected light from returning along the original path.

[0052] Anti-reflection lenses are typically coated with anti-reflection films for specific laser wavelengths (such as 1070nm) to maximize the transmittance at that wavelength and minimize reflection. In other words, they maximize the transmittance of the laser and ensure that most of the laser light entering the coolant is absorbed.

[0053] The optical surface of the intensifying lens is tilted at an angle θ to the central axis of the light-collecting tube 1 (i.e., the theoretical incident direction of the laser), preferably 30°. This installation method ensures that the normal direction of the intensifying lens does not coincide with the incident direction of the laser. Thus, the propagation direction of the small amount of reflected light generated by the intensifying lens deviates from the original incident direction of the laser, blocking the path of the reflected light back to the laser emission system along the original optical path. This effectively avoids interference or optical damage to the laser emission system caused by the reflected light, thereby improving the safety of the entire laser system.

[0054] Based on the above embodiments, as a further preferred option, please refer to... Figure 2 The transmissive water-cooled high-power laser collecting device also includes a light shield 8, which is fitted outside the opening end of the light collecting tube 1. The inner wall of the light shield 8 is provided with a sawtooth structure 9 for diffuse reflection and absorption of stray light reflected from the surface of the intensifying lens.

[0055] Specifically, the light shield 8 is a metal cylinder with an inner diameter slightly larger than the outer diameter of the open end of the light receiver 1, so that it can be tightly and coaxially fitted onto the outside of the open end of the light receiver 1 and fixedly connected by fasteners (such as screws). In this way, the light shield 8, as the outer sleeve of the front end of the light receiver 1, will not obstruct the main laser beam. Its diameter is only occupied by: air, intensifying lens (sealed at the front end of the light receiver 1), and cooling water, which will not come into contact with the light shield 8.

[0056] Furthermore, the inner wall of the light shield 8 is provided with multiple toothed racks spaced around its axis. These racks form a ring-shaped sawtooth structure 9, making the inner wall of the light shield 8 a non-smooth sawtooth surface. In this way, when stray light reflected from the surface of the intensifier lens is incident on the sawtooth surface, it will undergo multiple disordered diffuse reflections. Each reflection is accompanied by the absorption of light energy (converted into heat) and randomization of direction. Ultimately, almost all of it is absorbed by the metal wall of the light shield 8 and converted into heat, which is then dissipated by air convection, thereby eliminating the risks associated with tilting the intensifier lens.

[0057] Based on the above embodiments, as a further preferred option, please refer to... Figure 1 and Figure 2 The transmissive water-cooled high-power laser collection device also includes a light shield front plate 10 and a centering and calibration target plate 11.

[0058] The front plate 10 of the light shield can be a square or round plate, which is fixed to the front end of the light shield 8, that is, the end away from the light collecting tube 1, by fasteners (such as screws). The center of the front plate 10 of the light shield has a light-passing hole for the laser to pass through. The diameter of the light-passing hole is larger than the maximum spot diameter of the laser to be collected, so as to ensure that the laser beam can pass through without obstruction.

[0059] The alignment plate 11 can be mounted in a pre-set guide groove or slot on the front plate 10 of the light shield by sliding or snapping. When the alignment plate 11 is installed in place, it completely covers the light-transmitting hole. The front of the alignment plate 11 is drawn with concentric target circles similar to shooting targets. During the alignment operation, the laser emits a low-power laser, which illuminates the alignment plate 11 to form a light spot. By observing and adjusting the position and angle of the entire device, the light spot is precisely aligned with the center of the target circle, thus completing the alignment. After alignment, the alignment plate 11 is removed from the front plate 10 of the light shield, at which point the light-transmitting hole is fully exposed, allowing the high-power working laser to enter through the hole.

[0060] In this way, the operator only needs to observe the degree of overlap between the laser spot and the target ring to complete the calibration, which conveniently ensures that the center of the incident laser is aligned with the center of the device (i.e., the central axis of the light collecting tube 1), maximizes the collecting performance of the device, avoids laser escape or local overload caused by misalignment, and also avoids the complicated operation of relying on visual alignment, thus improving the safety of high-power laser experiments.

[0061] Based on the above embodiments, as a further preferred embodiment, the front plate 10 of the light shield is provided with a slot adapted to the alignment target plate 11. In practical applications, multiple alignment target plates 11 of different specifications are provided. These target plates have the same external dimensions and structure, but the diameter of the target ring drawn on their respective front surfaces is different. When it is necessary to collect lasers with different spot diameters, the operator can select one of the multiple target plates with a matching target ring diameter according to the estimated size of the laser spot, and insert it into the slot of the front plate 10 of the light shield for alignment. After alignment, it is removed, and a suitable target plate can be quickly replaced according to the new laser parameters when needed next time. This enhances the versatility of the device and the convenience of the alignment operation.

[0062] Based on the above embodiments, as a further preferred embodiment, the intensifying lens is disposed at the open end of the light-collecting tube 1 via a detachable sealing structure. This allows the intensifying lens to be removed entirely from the light-collecting tube 1 for cleaning or inspection. Furthermore, intensifying lenses with different coatings can be quickly replaced for different laser wavelengths to optimize absorption of specific wavelengths of laser light, thus improving the versatility of the device.

[0063] In one specific embodiment, the sealing structure includes a lens mount, a pressure ring, and at least one sealing ring. The lens mount is an annular metal part with a central through hole, and its outer edge is detachably connected to the open end of the light-collecting tube 1 by bolts. The inner side of the lens mount has a stepped surface for supporting the intensifying lens. The sealing ring is made of an elastic material that is resistant to high temperature and coolant. The sealing ring is located between the intensifying lens and the stepped surface of the lens mount to achieve axial sealing. Another sealing ring can also be provided between the cylindrical surface of the intensifying lens and the inner hole of the lens mount to achieve radial sealing. The pressure ring is screwed into the internal thread of the lens mount. By tightening the pressure ring, its end face presses against the outer edge of the intensifying lens, thereby securing the intensifying lens to the stepped surface of the lens mount and compressing the sealing ring to form a reliable seal.

[0064] Furthermore, the target plate 11 is equipped with a storage structure for accommodating the intensifying lens. This means that after the intensifying lens is removed from the light-collecting tube 1 and cleaned, it can be placed in the storage structure, allowing the target plate containing the intensifying lens to be stored or housed as a whole. There is no need to configure a separate protective container for the intensifying lens, saving both cost and space, while ensuring the cleanliness and safety of the intensifying lens during storage and handling, effectively extending its service life.

[0065] In one specific embodiment, the storage structure is a storage slot adapted to the shape and thickness of the intensifying lens, with a protective pad attached inside the storage slot. This structure allows the calibration plate 11 to act as a protective cover, preventing the lens surface from being contaminated by dust or accidentally scratched when not in use.

[0066] It should be noted that since the high-power laser is directly incident into the coolant (such as pure water) for energy absorption, if there is air in the circulating coolant, the air will expand under the high-power laser energy. This air will move back and forth in the light-collecting tube 1 and cannot be completely expelled, severely affecting the absorption of high-power laser energy and creating significant uncertainty. Therefore, it is essential to ensure that there is no large amount of air in the circulating coolant when the inner cavity 2 is initially filled with coolant.

[0067] To expel air from the receiver tube 1 during initial water filling, as a further preferred embodiment, based on the above-described embodiment, a vent hole 6 is provided at the highest point (i.e., the top) of the receiver tube 1. The vent hole 6 is a through hole with internal threads, which is threadedly connected to a plug, allowing the vent hole 6 to be sealed by the plug when the inner cavity 2 is filled with coolant. Preferably, a sealing gasket can be provided on the plug, which is pressed against the opening of the vent hole 6 to effectively ensure the vent hole 6 is sealed during device operation.

[0068] During the initial filling, first unscrew the plug from the vent hole 6, leaving the vent hole 6 open. Then, begin injecting coolant through the inlet. As the liquid level rises, the air in the inner cavity 2 rises and is eventually completely expelled from the vent hole 6. When coolant is observed continuously overflowing from the vent hole 6, it indicates that the inner cavity 2 is completely filled with coolant and the air has been thoroughly expelled. At this point, immediately screw the plug into the vent hole 6 and tighten it to achieve a reliable seal. In this way, during subsequent light collection operations, the device can avoid the risks of energy scattering, pressure fluctuations, or even localized boiling or explosions that may be caused by the interaction between high-power lasers and bubbles.

[0069] Based on the above embodiments, as a further preferred embodiment, the transmissive water-cooled high-power laser collection device also includes a control system, which includes a temperature sensor, a flow regulating device, and a controller.

[0070] The temperature sensor can be either a contact or insertion type temperature probe, which is installed on an external pipeline connected to the liquid outlet of the laser receiver 1 to monitor the temperature of the coolant flowing out of the laser receiver 1 in real time. This position can reflect the temperature rise of the coolant after laser loading.

[0071] The flow regulation device can be a variable frequency pump or an electric regulating valve, which is installed on the circulation pipeline of the coolant circulation path and is used to regulate the flow rate (i.e., velocity) of the coolant flowing through the inner cavity 2 of the receiver tube 1 according to the control command.

[0072] The controller can be a programmable logic controller (PLC), which is electrically connected to the temperature sensor and flow regulation device via signal lines, and has a first temperature threshold and a second temperature threshold preset.

[0073] During device operation, the controller continuously reads signals from the temperature sensor. When the detected temperature exceeds a first preset threshold, the controller determines that the current heat dissipation is insufficient and there is a risk of overheating. It then sends a command to the flow regulation device to increase the coolant flow rate to enhance heat dissipation. When the detected temperature is below a second preset threshold, the controller determines that the heat dissipation capacity is sufficient and, to save energy, sends a command to reduce the coolant flow rate. Through this closed-loop feedback control, the device's heat dissipation capacity is adaptively and dynamically adjusted. This not only effectively prevents system overheating and ensures safety when laser power fluctuates or increases by increasing the coolant flow rate, but also achieves energy savings by reducing the coolant flow rate under low load conditions, thereby significantly improving the safety, energy efficiency, and economy of the device's operation.

[0074] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0075] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0076] The foregoing has provided a detailed description of a transmissive water-cooled high-power laser collection device provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A transmission-type water-cooled high-power laser collecting device, characterized in that, include: The light-collecting tube (1) is a sealed tube with an opening at one end. The tube wall of the light-collecting tube (1) is provided with an inlet and an outlet that communicate with its inner cavity (2) for connecting to an external circulation pipeline to form a coolant circulation path flowing through the inner cavity (2). The light-transmitting element (3) is sealed at the opening end of the light-collecting tube (1). The light-transmitting element (3) and the coolant in the inner cavity (2) of the light-collecting tube (1) are arranged sequentially along the laser incident direction, so that the laser to be collected can be transmitted through the light-transmitting element (3) and directly incident into the coolant to be absorbed. The light-transmitting element (3) is an intensifying lens, which is set at an angle to the laser incident direction to prevent the reflected light from its surface from returning along the original path. It also includes a light shield (8), which is fitted outside the opening end of the light-collecting tube (1). The inner wall of the light shield (8) is provided with a sawtooth structure (9) for diffuse reflection and absorption of stray light reflected from the surface of the lens.

2. The transmission-type water-cooled high-power laser collecting device according to claim 1, characterized in that, It also includes a light-resistant backplate (7), which is located on the inner side of the other end of the light-collecting tube (1) opposite to its opening end, and is arranged opposite to the light-transmitting element (3) to absorb the residual laser energy transmitted through the coolant.

3. The transmission-type water-cooled high-power laser collecting device according to claim 2, characterized in that, The light-resistant backplate (7) is made of a material with high temperature resistance and high thermal conductivity, and / or the light-collecting tube (1) is made of a material with high thermal conductivity.

4. The transmission-type water-cooled high-power laser collecting device according to claim 1, characterized in that, Also includes: The front plate (10) of the light shield is located at the front end of the light shield (8) away from the light receiving tube (1), and the center of the front plate (10) of the light shield is provided with a light-passing hole for the laser to pass through. The centering target plate (11) is detachably disposed on the front plate (10) of the light shield and covers the light-transmitting hole. The centering target plate (11) is provided with a target ring for aligning with the laser spot.

5. The transmission-type water-cooled high-power laser collecting device according to claim 4, characterized in that, The front panel (10) of the light shield is provided with a slot, and the centering and calibration target plate (11) consists of multiple target rings with different diameters. The multiple centering and calibration target plates (11) can be selectively inserted into the slot.

6. The transmission-type water-cooled high-power laser collecting device according to claim 4, characterized in that, The intensifying lens is disposed at the open end of the light-collecting tube (1) via a detachable sealing structure; The centering and calibration target plate (11) is provided with a storage structure for accommodating the intensifying lens. When the intensifying lens is removed from the light-collecting tube (1), it can be placed in the storage structure.

7. The transmission-type water-cooled high-power laser collecting device according to claim 1, characterized in that, The highest point of the light-collecting tube (1) is provided with an exhaust hole (6), which is sealed by a plug when the inner cavity (2) is filled with coolant.

8. The transmission-type water-cooled high-power laser collecting device according to claim 1, characterized in that, It also includes a control system, which includes: A temperature sensor is installed in the external pipeline connected to the liquid outlet to monitor the temperature of the coolant flowing out of the light-collecting tube (1); A flow regulating device is provided in the coolant circulation path to regulate the flow rate of the coolant flowing through the inner cavity (2); The controller is electrically connected to the temperature sensor and the flow regulating device. When the temperature monitored by the temperature sensor exceeds a first preset threshold, the controller controls the flow regulating device to increase the coolant flow rate; when the temperature is lower than a second preset threshold, the controller controls the flow regulating device to decrease the coolant flow rate.

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