An optical absorber for high power lasers

Abstract

The utility model discloses a light absorber for high power laser, including beam expander, adaptation seat, absorption subassembly and temperature sensor, absorption subassembly includes base and sets up a plurality of absorption sheet on base close to adaptation seat one side, temperature sensor sets up on base far away from absorption sheet one side, the inside of base is provided with cooling channel, and the heat -insulating pad is arranged between adaptation seat and base, one end of beam expander is connected with base far away from temperature sensor one side, and beam expander penetrates the thickness direction of adaptation seat and heat -insulating pad, a plurality of absorption sheet are located in the inside of beam expander, and a plurality of absorption sheet interval set up and every absorption sheet all are inclined to set up. The utility model discloses a light absorber for high power laser, through a plurality of inclined and interval set up's absorption sheet on base, simplifies absorption subassembly's structure simplification, through the structural design to absorption sheet and base, can further promote absorption efficiency and absorption integrity, and the security is stronger.

Description

Technical Field

[0001] This utility model belongs to the field of laser technology, and specifically relates to a light absorber for high-power lasers. Background Technology

[0002] In high-power laser processing, experiments, or tests, laser absorbers are required to absorb and dissipate laser energy to prevent damage to instruments or the working environment. Existing laser absorbers are mainly divided into two categories: one is the traditional conical energy cup structure, which has problems such as the laser contact surface being easily damaged, strong light reflection causing photoaging of surrounding devices, and the generation of metal dust that pollutes the environment and optical components. Another type is the improved beam-expanding and reflection absorption structure. Although it reduces power density through laser beam expansion and achieves multiple reflection absorption through finned structures, it still has the following limitations: 1) The absorber uses highly reflective metal materials such as aluminum alloy, copper, and gold, with a single reflection absorption rate of less than 10%. It needs to rely on multiple reflections to gradually absorb energy, which requires high precision in structural design. Moreover, long-term reflection on the metal surface is prone to wear, affecting absorption stability; 2) The structure consists of a laser beam expander, an absorber, and an active cooling module. Assembly relies on threaded connections and screw tightening, making the structure relatively complex and inconvenient for disassembly and maintenance; 3) The cooling module only dissipates heat through circulating cooling water, lacking temperature monitoring and safety interlocking mechanisms, and cannot cope with the risk of sudden overheating; 4) The material selection involves precious metals such as gold, or requires the processing of wedge-shaped finned structures, resulting in high manufacturing costs and limiting large-scale applications. In addition, other existing absorbers (such as coated and ceramic structures) also have problems such as coating ablation and peeling, and the high brittleness of ceramics making them difficult to repair. Utility Model Content

[0003] In view of this, in order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a light absorber for high-power lasers.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An optical absorber for a high-power laser includes a beam expander, an adapter, an absorption assembly, and a temperature sensor. The absorption assembly includes a base and multiple absorber plates disposed on the side of the base near the adapter. The temperature sensor is disposed on the side of the base away from the absorber plates. A cooling channel is provided inside the base. A heat insulation pad is disposed between the adapter and the base. One end of the beam expander is connected to the side of the base away from the temperature sensor. The beam expander extends through the thickness direction of the adapter and the heat insulation pad. The multiple absorber plates are located inside the beam expander, spaced apart and each plate is tilted. The temperature sensor allows for real-time monitoring of the temperature of the absorber plates and the base, preventing overheating damage and providing safety protection. Furthermore, the heat insulation pad prevents heat from the base from being conducted back to the absorber plates, thus avoiding interference with absorption.

[0005] According to some preferred embodiments of the present invention, the base includes a base body and a mounting base, the mounting base being located in the middle of the base body on the side near the adapter, and the mounting base being used to mount a plurality of absorbent sheets.

[0006] According to some preferred embodiments of the present invention, the mounting base is cylindrical in shape, and a plurality of mounting grooves and a plurality of annular grooves are provided on the side of the mounting base away from the base body. The plurality of mounting grooves are provided in a one-to-one correspondence with a plurality of absorbent sheets. The plurality of annular grooves are spaced apart from the center of the mounting base outwards. Each mounting groove and annular groove is opened from the side of the mounting base away from the base body to the other side, and the depth of each mounting groove and annular groove is less than the height of the mounting base.

[0007] According to some preferred embodiments of the present invention, the width of each annular groove gradually decreases from its opening to the bottom, and the bottom edges of the two sidewalls of each annular groove are connected.

[0008] According to some preferred embodiments of the present invention, a plurality of absorbent sheets are arranged at intervals along the length direction parallel to the base body and from the top to the bottom of the mounting base, and each absorbent sheet is inserted into a corresponding mounting slot.

[0009] According to some preferred embodiments of the present invention, the included angle between the planes of two adjacent absorbent sheets is 3°-5°, the distance between two adjacent absorbent sheets is 0-2mm, and the thickness of each absorbent sheet is 0.5-1mm.

[0010] According to some preferred embodiments of this invention, the distance between one of the two absorbers and the other absorber gradually increases from one end to the other, while the distance between the absorber and the other absorber gradually decreases from one end to the other. Each absorber is positioned with a pre-reserved gap. The gap between adjacent absorbers can release internal stress during thermal expansion and contraction to prevent structural deformation, and also form a multi-level reflection channel. A small amount of laser light not absorbed in a single pass is gradually dissipated after multiple reflections within the gap, further improving absorption integrity.

[0011] According to some preferred embodiments of the present invention, the orthographic projection of all the absorbent sheets on the base body is within the range of the orthographic projection of the mounting base on the base body, and the length of the plurality of absorbent sheets gradually increases from the absorbent sheet located at the top of the mounting base to the absorbent sheet located in the middle of the mounting base, and gradually decreases from the absorbent sheet located in the middle of the mounting base to the absorbent sheet located at the bottom of the mounting base.

[0012] According to some preferred embodiments of the present invention, the beam expander includes a sleeve and a beam expanding lens located at the end of the sleeve away from the base. The end of the sleeve near the base is fitted onto the outer periphery of the mounting base. A plurality of the absorbing sheets are located inside the sleeve. The end face of the sleeve near the base is in contact with the side of the base body near the heat insulation pad. The inner wall of the end of the sleeve near the base is in contact with the outer peripheral surface of the mounting base. The length of the sleeve is greater than the sum of the thicknesses of the adapter and the heat insulation pad.

[0013] According to some preferred embodiments of this utility model, the absorbing sheet is a copper sheet, and the base is made of metal. In some embodiments of this utility model, each absorbing sheet is a blackened copper sheet, replacing the traditional high-reflectivity metal fins. The surface of the copper sheet can form a micro-rough structure through chemical or thermal blackening oxidation treatment, achieving a single-pass absorption rate of over 85% for laser energy, thus efficiently absorbing laser energy without relying on multiple reflections.

[0014] By adopting the above technical solutions, compared with the prior art, the light absorber for high-power lasers of this utility model simplifies the structure of the absorption components by using multiple inclined and spaced absorption plates on the base. Through the structural design of the absorption plates and the base, the absorption efficiency and absorption integrity can be further improved, and the safety is stronger. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the light absorber from a first-view perspective in a preferred embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the light absorber from a second perspective in a preferred embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of the light absorber in a preferred embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the absorption component in a preferred embodiment of the present invention; Figure 5 This is a schematic diagram of the front view of the absorption component in a preferred embodiment of the present invention; The attached figures are labeled as follows: beam expander-1, sleeve-11, beam expander lens-12, adapter-2, absorption assembly-3, base body-31, mounting base-32, mounting groove-321, annular groove-322, absorption sheet-33, temperature sensor-4, heat insulation pad-5, water pipe connector-6. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 should fall within the protection scope of the present invention.

[0018] Reference Figures 1 to 5 This embodiment of an optical absorber for a high-power laser includes a beam expander 1, an adapter 2, an absorption component 3, a temperature sensor 4, a heat insulation pad 5, and a cooling module. The heat insulation pad 5 is connected to both the adapter 2 and the absorption component 3. One end of the beam expander 1 passes through the thickness direction of the adapter 2 and the heat insulation pad 5 and is connected to one side of the absorption component 3. The cooling module is used to efficiently dissipate heat from the absorption component 3.

[0019] Furthermore, such as Figure 3 and Figure 4 As shown, the absorption assembly 3 includes a base and multiple absorption sheets 33 disposed on the side of the base near the adapter 2. The base is made of metal and includes a base body 31 and a cylindrical mounting base 32. The mounting base 32 is located in the middle of the side of the base body 31 near the adapter 2 and is used to mount the multiple absorption sheets 33. A temperature sensor 4 is fixedly disposed on the side of the base body 31 away from the absorption sheets 33 to monitor the temperature of the absorption sheets 33 and the base in real time. The heat insulation pads 5 are fixedly connected to one side of the adapter 2 and one side of the base body 31 on both sides, respectively. The heat insulation pads 5 can prevent the heat from the base from being conducted back to the absorption sheets 33 and affecting the absorption effect.

[0020] Specifically, such as Figure 5As shown, multiple absorbent sheets 33 are spaced apart along the length of the base body 31 from the top to the bottom of the mounting base 32. The length of the absorbent sheets 33 gradually increases from the absorbent sheet 33 at the top of the mounting base 32 to the absorbent sheet 33 in the middle of the mounting base 32, and gradually decreases from the absorbent sheet 33 in the middle of the mounting base 32 to the absorbent sheet 33 at the bottom of the mounting base 32. Each absorbent sheet 33 is inclined, and the included angle between the planes of two adjacent absorbent sheets 33 is preferably 5°. The thickness of each absorbent sheet 33 is preferably 0.5 mm. The distance between two adjacent absorbent sheets 33 is 0-2 mm. Furthermore, the distance between one absorbent sheet 33 and one of the absorbent sheets 33 gradually increases from one end to the other, while the distance between the absorbent sheet 33 and the other absorbent sheet 33 gradually decreases from one end to the other. In this embodiment, each absorber 33 is arranged with a reserved gap. The gap between adjacent absorber 33 can release internal stress during thermal expansion and contraction to avoid structural deformation, and can also form a multi-level reflection channel. The small amount of laser light that is not absorbed in a single instance is gradually dissipated after multiple reflections within the gap, further improving the absorption integrity. In addition, the absorber 33 in this embodiment is a blackened copper sheet with excellent thermal conductivity, and the single-instance absorption rate of laser energy can reach more than 85%, which can efficiently absorb laser energy without relying on multiple reflections.

[0021] Furthermore, such as Figures 3 to 5 As shown, the mounting base 32 has multiple mounting slots 321 and multiple annular grooves 322 on the side away from the base body 31. Each mounting slot 321 corresponds to one of the multiple absorption plates 33, and each absorption plate 33 is inserted into its corresponding mounting slot 321. The orthographic projections of all absorption plates 33 onto the base body 31 are within the range of the orthographic projection of the mounting base 32 onto the base body 31. The multiple annular grooves 322 are spaced outwards from the center of the mounting base 32. Each mounting slot 321 and annular groove 322 is opened from the side of the mounting base 32 away from the base body 31 to the other side, and the depth of each mounting slot 321 and annular groove 322 is less than the height of the mounting base 32. The width of each annular groove 322 gradually decreases from its opening to its bottom. The bottom edges of the two sidewalls of each annular groove 322 are connected. The annular grooves 322 provide more gaps between adjacent absorption plates 33, which is beneficial for heat dissipation.

[0022] Furthermore, such as Figure 3As shown, the beam expander 1 includes a sleeve 11 and a beam expanding lens 12 located at the end of the sleeve 11 away from the base. Multiple absorber plates 33 are located inside the sleeve 11. The end of the sleeve 11 near the base passes through the thickness direction of the adapter 2 and the heat insulation pad 5 and is fitted onto the outer periphery of the mounting base 32. The end face of the sleeve 11 near the base is in contact with the side of the base body 31 near the heat insulation pad 5, and the inner wall of the end of the sleeve 11 near the base is in contact with the outer peripheral surface of the mounting base 32. The length of the sleeve 11 is greater than the sum of the thicknesses of the adapter 2 and the heat insulation pad 5.

[0023] Furthermore, the cooling module includes a cooling channel (not shown) formed inside the base body 31 and two water pipe connectors 6 fixedly mounted on the top of the base body 31. The bottom end of one water pipe connector 6 is connected to the water inlet of the cooling channel, and the top end of the water pipe connector 6 is connected to the water inlet pipe. The bottom end of the other water pipe connector 6 is connected to the water outlet of the cooling channel, and the top end of the water pipe connector 6 is connected to the water outlet pipe. Cooling water is continuously introduced into the cooling channel to perform water cooling heat dissipation on the absorption component 3. In this embodiment, the arrangement of the absorption plate 33, combined with the arrangement of the cooling module, forms a highly efficient heat dissipation path of "high thermal conductivity" and "direct water cooling", which is conducive to rapid heat dissipation.

[0024] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A light absorber for a high-power laser, characterized in that, The device includes a beam expander, an adapter, an absorption assembly, and a temperature sensor. The absorption assembly includes a base and multiple absorption sheets disposed on the side of the base near the adapter. The temperature sensor is disposed on the side of the base away from the absorption sheets. The base has a cooling channel inside. A heat insulation pad is disposed between the adapter and the base. One end of the beam expander is connected to the side of the base away from the temperature sensor. The beam expander extends through the thickness direction of the adapter and the heat insulation pad. The multiple absorption sheets are located inside the beam expander and are spaced apart, with each absorption sheet being inclined.

2. The light absorber according to claim 1, characterized in that, The base includes a base body and a mounting base. The mounting base is located in the middle of the base body on the side near the adapter, and the mounting base is used to mount multiple absorbent sheets.

3. The light absorber according to claim 2, characterized in that, The mounting base is cylindrical in shape. On the side of the mounting base away from the base body, there are multiple mounting slots and multiple annular grooves. The multiple mounting slots correspond one-to-one with the multiple absorbent sheets. The multiple annular grooves are spaced out from the center of the mounting base outwards. Each mounting slot and annular groove is opened from the side of the mounting base away from the base body to the other side, and the depth of each mounting slot and annular groove is less than the height of the mounting base.

4. The light absorber according to claim 3, characterized in that, The width of each annular groove gradually decreases from its opening to its bottom, and the bottom edges of the two sidewalls of each annular groove are connected.

5. The light absorber according to claim 3, characterized in that, Multiple absorbent sheets are spaced apart along the length of the base body from the top to the bottom of the mounting base, and each absorbent sheet is inserted into a corresponding mounting slot.

6. The light absorber according to claim 5, characterized in that, The included angle between the planes of two adjacent absorber sheets is 3°-5°, the distance between two adjacent absorber sheets is 0-2mm, and the thickness of each absorber sheet is 0.5-1mm.

7. The light absorber according to claim 6, characterized in that, The distance between one of the two absorber sheets and the other absorber sheet gradually increases from one end to the other, and the distance between the absorber sheet and the other absorber sheet gradually decreases from one end to the other.

8. The light absorber according to claim 5, characterized in that, All the absorption sheets are projected onto the base body within the range of the mounting base's projection onto the base body. The length of the multiple absorption sheets gradually increases from the absorption sheet at the top of the mounting base to the absorption sheet in the middle of the mounting base, and gradually decreases from the absorption sheet in the middle of the mounting base to the absorption sheet at the bottom of the mounting base.

9. The light absorber according to claim 2, characterized in that, The beam expander includes a sleeve and a beam expanding lens located at the end of the sleeve away from the base. The end of the sleeve near the base is fitted onto the outer periphery of the mounting base. A plurality of the absorbing sheets are located inside the sleeve. The end face of the sleeve near the base is in contact with the side of the base body near the heat insulation pad. The inner wall of the end of the sleeve near the base is in contact with the outer peripheral surface of the mounting base. The length of the sleeve is greater than the sum of the thicknesses of the adapter and the heat insulation pad.

10. The light absorber according to claim 1, characterized in that, The absorbent sheet is made of copper, and the base is made of metal.

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