A continuous high power laser absorption device

Abstract

The utility model belongs to the field of laser technology discloses a kind of continuous high-power laser absorption device, it includes: including cooling module (1), laser absorption module (2), water outlet (3), sealing top cover (4), beam expander (5), water inlet (7);The laser absorption module (2) is arranged in cooling module (1) inside, cooling channel is formed between cooling module (1) inner wall and laser absorption module (2) outer wall;Water inlet (7) and water outlet (3) are provided on cooling channel;Laser absorption module (2) and cooling module (1) are provided with thread in laser incidence direction, sealing top cover (4) is threadedly connected laser absorption module (2) and cooling module (1);The inside of the front end laser incidence port of laser absorption module (2) is installed beam expander (5).The utility model will not occur laser leakage, high safety, can be applicable to high-power laser waste light absorption when continuous light emission or long time work.

Description

Technical Field

[0001] This utility model belongs to the field of laser technology and relates to a continuous high-power laser absorption device. Background Technology

[0002] With the continuous development of laser technology, the demand for high-power lasers in many fields such as national defense equipment, aerospace, and shipbuilding is constantly increasing. Because high-power lasers have high energy density and require continuous emission, a large amount of excess laser light is generated during debugging and use. This excess laser light can easily damage optical components (lenses, mirrors, etc.), and if accidentally reflected or scattered, it may cause serious injury to operators or equipment. Therefore, excess laser light absorption is crucial. Laser absorption devices can effectively absorb laser energy, converting the absorbed laser light into heat energy that is dissipated, protecting optical components from damage by strong laser light and reducing safety risks. They play a vital role in the operation of high-power lasers.

[0003] Continuous high-power laser incidence can easily damage the contact surfaces of the laser absorption device, requiring frequent replacement. Furthermore, strong lasers can easily reflect off the inner walls of the absorption device, causing laser leakage, which can endanger the health of operators and damage surrounding equipment.

[0004] Existing patent CN203859378U discloses an active cooling high-energy laser absorption device. This device expands the laser spot size using a beam expander to reduce laser power density and absorbs high-energy laser heat through a finned laser absorber that makes full contact with the laser. However, because the laser is incident in a straight line, the heat is mainly concentrated at the bottom of the laser absorption device. The small contact area between the finned laser absorber and the cooling module limits its heat dissipation function, making it unsuitable for absorbing waste light from continuously emitting high-power lasers. Utility Model Content

[0005] (I) Purpose of the utility model

[0006] The purpose of this invention is to provide a continuous high-power laser absorption device that solves the problems of uneven heat dissipation and easy burn-out of the absorption device in the existing technology for high-power laser absorption, and achieves long-term absorption performance of the device for high-power lasers.

[0007] (II) Technical Solution

[0008] To solve the above-mentioned technical problems, this utility model provides a continuous high-power laser absorption device, which includes: a cooling module 1, a laser absorption module 2, a water outlet 3, a sealing top cover 4, a beam expander 5, and a water inlet 7; the laser absorption module 2 is disposed inside the cooling module 1, and a cooling channel is formed between the inner wall of the cooling module 1 and the outer wall of the laser absorption module 2; the cooling channel is provided with a water inlet 7 and a water outlet 3; the laser absorption module 2 and the cooling module 1 are provided with threads in the laser incident direction, and the sealing top cover 4 is threadedly connected to the laser absorption module 2 and the cooling module 1; the beam expander 5 is installed inside the laser incident port at the front end of the laser absorption module 2.

[0009] Furthermore, the laser absorption module 2 includes a vertical absorption surface 2-1, an outer wall 2-2, an inner wall 2-3, a mirror base 2-4, a laser absorption cone 2-5, a thermal mirror 2-6, and a second screw 2-7; the outer wall 2-2 and the inner wall 2-3 form a conical sidewall, the vertical absorption surface 2-1 is located at the bottom and faces the laser inlet, the laser absorption cone 2-5 is set at the center of the vertical absorption surface 2-1, the mirror base 2-4 is installed on the vertical absorption surface 2-1 by the second screw 2-7, the mirror base 2-4 is located around the laser absorption cone 2-5, and the thermal mirror 2-6 is installed on the mirror base 2-4.

[0010] Furthermore, the angle between the hot mirror 2-6 and the vertical absorption surface 2-1 is 45° to 75°.

[0011] Furthermore, the thermal mirror 2-6 has a transmission wavelength of 420–690 nm, a reflection wavelength of 725–1550 nm, and a reflectivity of ≥90%.

[0012] Furthermore, the ratio of the diameter of the wide aperture at the rear end to the narrow aperture at the front end of the laser absorption module 2 is consistent with the beam expansion factor of the beam expander.

[0013] Furthermore, the laser absorption module 2 is provided with threads and a sealing groove at the laser inlet, and the inner ring of the sealing top cover 4 is connected to the laser absorption module 2 through threads and isolated from the cooling channel through the sealing ring.

[0014] Furthermore, the cooling module 1 has threads and a sealing groove at the laser inlet, and the outer ring of the sealing top cover 4 is connected to the cooling module 1 by threads and sealed by a sealing ring.

[0015] Furthermore, the housing of the laser absorption module 2 and the laser absorption cone 2-5 are integrally cast and made of high-efficiency thermal conductive materials.

[0016] Furthermore, the apex angle of the laser absorption cone 2-5 is 15° to 30°; the beam expansion angles of the outer wall 2-2 and the inner wall 2-3 are consistent, ranging from 120° to 135°.

[0017] Furthermore, the water inlet 7 is located below the cooling module 1, and the water outlet 3 is located above the cooling module 1, with the cooling water entering from the lower end and exiting from the higher end.

[0018] (III) Beneficial Effects

[0019] The continuous high-power laser absorption device provided by the above technical solution has the following beneficial effects:

[0020] (1) The present invention provides a continuous high-power laser absorption device that splits the laser beam through thermal mirror reflection and central laser absorption cone, so that the laser heat is evenly distributed to each inner absorption surface, reducing the risk of the laser absorption module being burned out, preventing laser leakage, and ensuring high safety. It is suitable for absorbing waste light from high-power lasers that are continuously emitting light or working for a long time.

[0021] (2) The present invention provides a continuous high-power laser absorption device that expands the laser spot diameter and reduces the laser energy density by using the laser entrance beam expander and the "horn tube" structure of the laser absorption module, thereby improving the durability and reliability of the device.

[0022] (3) The present invention provides a continuous high-power laser absorption device with a fully covered cooling channel on the outer wall of the laser absorption module. The outer wall is in full contact with the cooling water to form a good cooling circulation system, ensuring that the heat generated by the high-power laser is quickly replaced by the cooling water, thus achieving long-term heat conduction stability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the practical laser absorption module;

[0025] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 4 This is a schematic diagram of the optical path propagation of the high-power laser in the high-power laser absorption device of this utility model. Detailed Implementation

[0027] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0028] Reference Figures 1 to 4As shown, the continuous high-power laser absorption device in this embodiment includes a cooling module 1, a laser absorption module 2, a water outlet 3, a sealing top cover 4, a beam expander 5, a first screw 6, and a water inlet 7. The laser absorption module 2 is disposed inside the cooling module 1, and a cooling channel is formed between the inner wall of the cooling module 1 and the outer wall of the laser absorption module 2. The cooling channel is provided with a water inlet 7 and a water outlet 3. The laser absorption module 2 and the cooling module 1 are provided with threaded holes in the laser incident direction. The sealing top cover 4 is connected to the laser absorption module 2 and the cooling module 1 by the first screw 6 and is sealed by a sealing ring. The beam expander 5 is installed inside the laser incident port at the front end of the laser absorption module 2.

[0029] The laser absorption module 2 is a horn tube cone structure that provides a large-diameter channel for the expanded laser beam. The ratio of the diameter of its wide rear end to its narrow front end is consistent with the beam expansion factor of the beam expander.

[0030] The laser absorption module 2 includes a vertical absorption surface 2-1, an outer wall 2-2, an inner wall 2-3, a mirror base 2-4, a laser absorption cone 2-5, a thermal mirror 2-6, and a second screw 2-7. The outer wall 2-2 and the inner wall 2-3 form a conical sidewall. The vertical absorption surface 2-1 is located at the bottom and faces the laser inlet. The laser absorption cone 2-5 is set at the center of the vertical absorption surface 2-1. The mirror base 2-4 is installed on the vertical absorption surface 2-1 by the second screw 2-7. The mirror base 2-4 is located around the laser absorption cone 2-5. The thermal mirror 2-6 is installed on the mirror base 2-4.

[0031] The laser absorption module 2 has threads and a sealing groove at the laser inlet. The inner ring of the sealing top cover 4 is connected to the laser absorption module 2 through threads and is isolated from the cooling channel through the sealing ring.

[0032] The cooling module 1 has threads and a sealing groove at the laser inlet. The outer ring of the sealing top cover 4 is connected to the cooling module 1 by threads and is sealed by a sealing ring.

[0033] The hot mirror 2-6 is mounted on the mirror base 2-4, which is connected to the vertical absorption surface 2-1 via a second screw 2-7 and is installed inside the laser absorption module. Preferably, the angle between the hot mirror 2-6 and the vertical absorption surface 2-1 is 45° to 75°; in this embodiment, the angle is 45°. The hot mirror 2-6 transmits laser light in the range of 420–690 nm, reflects laser light in the range of 725–1550 nm, and has a reflectivity ≥90%.

[0034] The housing of the laser absorption module 2 and the laser absorption cone 2-5 are integrally cast and made of a high-efficiency thermally conductive material. Preferably, the apex angle of the laser absorption cone 2-5 is 15° to 30°, and in this embodiment, the apex angle is 30°. The beam expansion angles of the outer wall 2-2 and the inner wall 2-3 are consistent, ranging from 120° to 135°.

[0035] The beam expander 5 is installed in the groove of the sealed top cover 4 to expand the incident laser beam. Preferably, the magnification of the beam expander is 5 to 8 times, and the ratio of the wide and narrow diameters of the cooling module 1 and the laser absorption module 2 is consistent with the beam expansion factor. In this embodiment, the beam expansion factor is 5 times, and the ratio of the wide and narrow diameters of the cooling module 1 and the laser absorption module 2 is 5.

[0036] The water inlet 7 is located below the cooling module 1, and the water outlet 3 is located above the cooling module 1. The low inlet and high outlet method ensures that the cooling water is in full contact with the outer wall 2-2 of the laser absorption module 2, so as to achieve a good heat exchange effect.

[0037] like Figure 4 As shown, the working principle of the continuous high-power laser absorption device in this embodiment is as follows: The laser beam to be absorbed enters the device aligned with the sealed top cover 4; the beam first passes through the beam expander 5 to enlarge the spot diameter and reduce the laser power density; the central laser beam is incident on the laser absorption cone 2-5 of the laser absorption module 2. After the laser absorption cone 2-5 absorbs part of the laser heat from the central laser beam, the remaining laser is reflected onto the vertical absorption surface for further absorption; the surrounding laser beams, except for the central beam, are incident on the hot mirror 2-6. Visible light carrying a small amount of heat passes through the hot mirror and is absorbed by the vertical absorption surface 2-1, while infrared light carrying a large amount of heat is reflected to the inner wall 2-3. Since the normal direction of the inner wall reflection surface 2-3 faces the inside of the laser absorption module 2, the remaining infrared light will continue to be reflected between the hot mirror 2-6 and the inner wall 2-3 until it is completely absorbed. The heat absorbed by the laser absorption module 2 is absorbed and quickly carried away by the circulating cooling water in the cooling channel of the cooling module 1, realizing the absorption of waste light when the high-power laser is continuously emitting light.

[0038] In this embodiment of the continuous high-power laser absorption device, the laser beam is expanded by a beam expander upon incident, initially reducing the laser power density. The central laser beam is directly incident on the laser absorption cone of the laser absorption module. After the laser absorption cone absorbs part of the laser, the excess laser is reflected onto the vertical absorption surface, achieving absorption of the central laser beam. Most of the laser beams from the surrounding area are reflected by the hot mirror surface, carrying a large amount of heated infrared light to the inner wall of the laser absorption module. Since the normal vector of the reflecting surface points inward towards the laser absorption module, after the inner wall absorbs part of the laser, the remaining laser does not reflect outward but continues to reflect between the vertical absorption surface and the inner wall, further reducing the laser energy until it is completely absorbed. After the inner wall and vertical absorption surface of the laser absorption module uniformly absorb heat, the cooling water in the cooling channel between the outer wall of the laser absorption module and the laser cooling module quickly removes the heat.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A continuous high-power laser absorption device, characterized in that, include: It includes a cooling module (1), a laser absorption module (2), a water outlet (3), a sealing top cover (4), a beam expander (5), and a water inlet (7); the laser absorption module (2) is located inside the cooling module (1), and a cooling channel is formed between the inner wall of the cooling module (1) and the outer wall of the laser absorption module (2); the cooling channel is provided with a water inlet (7) and a water outlet (3); the laser absorption module (2) and the cooling module (1) are provided with threads in the laser incident direction, and the sealing top cover (4) is threaded to connect the laser absorption module (2) and the cooling module (1); a beam expander (5) is installed inside the laser incident port at the front end of the laser absorption module (2).

2. The continuous high-power laser absorption device as described in claim 1, characterized in that, The laser absorption module (2) includes a vertical absorption surface (2-1), an outer wall (2-2), an inner wall (2-3), a mirror base (2-4), a laser absorption cone (2-5), a thermal mirror (2-6), and a second screw (2-7). The outer wall (2-2) and the inner wall (2-3) form a cone-shaped sidewall. The vertical absorption surface (2-1) is located at the bottom and faces the laser inlet. The laser absorption cone (2-5) is set at the center of the vertical absorption surface (2-1). The mirror base (2-4) is installed on the vertical absorption surface (2-1) by the second screw (2-7). The mirror base (2-4) is located around the laser absorption cone (2-5). The thermal mirror (2-6) is installed on the mirror base (2-4).

3. The continuous high-power laser absorption device as described in claim 2, characterized in that, The angle between the hot mirror (2-6) and the vertical absorption surface (2-1) is 45° to 75°.

4. The continuous high-power laser absorption device as described in claim 3, characterized in that, The thermal mirror (2-6) has a transmission wavelength of 420–690 nm and a reflection wavelength of 725–1550 nm, with a reflectivity ≥90%.

5. The continuous high-power laser absorption device as described in claim 4, characterized in that, The ratio of the diameter of the wide opening at the rear end to the narrow opening at the front end of the laser absorption module (2) is consistent with the beam expansion factor of the beam expander.

6. The continuous high-power laser absorption device as described in claim 5, characterized in that, The laser absorption module (2) has threads and a sealing groove at the laser inlet. The inner ring of the sealing top cover (4) is connected to the laser absorption module (2) through threads and is isolated from the cooling channel through the sealing ring.

7. The continuous high-power laser absorption device as described in claim 6, characterized in that, The cooling module (1) has threads and a sealing groove at the laser inlet. The outer ring of the sealing top cover (4) is connected to the cooling module (1) by threads and sealed by a sealing ring.

8. The continuous high-power laser absorption device as described in claim 7, characterized in that, The housing of the laser absorption module (2) and the laser absorption cone (2-5) are integrally cast and made of high-efficiency heat-conducting materials.

9. The continuous high-power laser absorption device as described in claim 8, characterized in that, The apex angle of the laser absorption cone (2-5) is 15° to 30°; the beam expansion angles of the outer wall (2-2) and the inner wall (2-3) are consistent, ranging from 120° to 135°.

10. The continuous high-power laser absorption device as described in claim 9, characterized in that, The water inlet (7) is located below the cooling module (1), and the water outlet (3) is located above the cooling module (1), with the cooling water entering from the bottom and exiting from the top.

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