High-power laser absorber

Abstract

The utility model relates to the technical field of laser processing, in particular to a high-power laser absorber which comprises an absorption body, a light absorption layer, a light transmitting layer and protrusions, a plurality of grooves are formed in the surface of the absorption body, the protrusions are arranged at the bottoms of the grooves, the light absorption layer covers the protrusions, and the light transmitting layer covers the light absorption layer. According to the utility model, the groove and the multi-layer light absorption structure are adopted, the light-transmitting layer allows laser rays to pass through and reach the light absorption layer, and meanwhile, the conical bulge and the particle structure enable incident rays to be reflected for multiple times in the groove, gradually attenuated and absorbed. According to the high-power laser absorber, the light transmitting layer limits laser between the light transmitting layer and the protrusions, laser absorption of the light absorption layer is enhanced, the high-power laser absorber can absorb laser energy more efficiently, light path interference and unnecessary reflection are avoided, and the high-power laser absorber has good application prospects in the technical field of laser processing.

Description

Technical Field

[0001] This application relates to the field of laser processing technology, and particularly to a high-power laser absorber. Background Art

[0002] In laser scribing, a polarizer divides the laser into p-polarized light (parallel polarized light) and s-polarized light (perpendicular polarized light). The p-polarized light is parallel to the incident plane, while the s-polarized light is perpendicular to the incident plane. The p-polarized light is used for laser scribing, and the remaining s-polarized light needs to be effectively absorbed to avoid interfering with the optical path or unnecessary reflections.

[0003] Traditionally, a copper plate is used as an absorber to absorb s-polarized light. Although copper has good thermal conductivity, its reflectivity is still relatively high in the visible and near-infrared spectral ranges. When the s-polarized light in a high-power laser beam irradiates the surface of the copper plate, although a part of the light energy is absorbed and converted into heat energy, a considerable part of the light is still reflected, causing interference to the optical path or unnecessary reflections. Summary of the Utility Model

[0004] To solve the above problems, the present utility model provides a high-power laser absorber, which includes an absorption body, a light absorption layer, a light-transmitting layer, and protrusions. The surface of the absorption body is provided with grooves, there are multiple protrusions, and the multiple protrusions are placed at the bottom of the grooves. The light absorption layer covers the protrusions, and the light-transmitting layer covers the light absorption layer.

[0005] In the present utility model, the light-transmitting layer allows the laser light to pass through and reach the light absorption layer. At the same time, the light-transmitting layer also plays a protective role, preventing external contaminants or mechanical damage from affecting the performance of the light absorption layer. The protrusions cause the incident light to be reflected multiple times inside the grooves, gradually attenuated and absorbed. The light-transmitting layer also confines the laser between the light-transmitting layer and the protrusions, which enhances the absorption of the laser by the light absorption layer. The present utility model enables the high-power laser absorber to more efficiently absorb laser energy, avoiding interference to the optical path and unnecessary reflections.

[0006] Furthermore, the protrusions are conical, and the tip of the cone faces the outside of the groove. The conical protrusions provide a larger surface area, such that the surface area covered by the light absorption layer is much larger than that of a planar structure, increasing the surface area of interaction with the incident light and improving the light absorption efficiency. In addition, when the laser irradiates the conical protrusions, the light is reflected multiple times on the conical structure. This multiple reflection increases the path length of the light inside the light absorption layer, enabling the light to have more opportunities to be absorbed by the light absorption layer, further improving the overall light absorption rate. Moreover, the conical protrusions also increase the surface area, which helps to quickly dissipate the absorbed heat energy and prevent local overheating.

[0007] Furthermore, the height direction of the cone is consistent with the normal direction of the surface of the absorption body. That is to say, the height direction of the cone is along the incident light direction. In this way, the light directly irradiates on the surface of the cone. Due to the gradually changing surface shape of the cone structure, the light will be reflected multiple times on the surface of the cone during the propagation process. In addition, the height of the cone protrusion is consistent with the incident light direction, reducing the chance of the light being directly reflected back. All of these enhance the absorption of high-power laser by the overall structure.

[0008] Furthermore, the protrusions are arranged periodically. The period can be a directional period, a rectangular period, or a hexagonal period. The periodic arrangement of the protrusion structure helps to evenly disperse the absorbed laser energy and avoid heat concentration in a small area.

[0009] Furthermore, the period is a hexagonal period. The hexagonal structure has the highest space filling rate on the plane, which can maximize the protrusion coverage area on the surface of the light absorption layer; ensuring the largest number of protrusions per unit area, thereby increasing the surface area of the light absorption layer and improving the light absorption efficiency.

[0010] Furthermore, the protrusions are particles. The particle structure can be prepared by a variety of simple and controllable processes, such as solution method, deposition method, and self-assembly method, etc. These processes are relatively simple and easy for large-scale production, reducing the manufacturing cost and improving the production efficiency. In addition, the particles can be made of a variety of materials, including metals, semiconductors, and ceramics, etc. The diversity of material selection enables designers to choose appropriate materials according to specific application requirements and optimize the optical and thermal properties of the absorber. The particles can also form a rough surface, reducing light reflection and increasing light absorption, and can also significantly improve the light absorption rate of the absorber, especially for the application of high-power laser.

[0011] Furthermore, the protrusions are spherical. The multiple scattering and reflection effects of spherical particles can increase the path length of light in the absorber and improve the light absorption efficiency.

[0012] Furthermore, the particles are in two layers. The double-layer particle structure can provide multiple absorption paths, enabling the incident light to be scattered and reflected multiple times inside and on the surface of the particles, increasing the residence time of light in the absorber, and improving the overall light absorption efficiency. In addition, the double-layer particles improve the heat conduction path, enabling the absorbed heat to be quickly conducted from the inner layer to the outer layer and then dissipated to the surrounding environment.

[0013] Furthermore, the particle size of the particles near the bottom of the groove is small, and the particle size of the particles far from the bottom of the groove is large. The larger particles can guide the light into the fiber and enter the bottom of the groove, while the gradually decreasing particle size can form multiple scattering and reflections on the propagation path of the light, thereby increasing the residence time of light in the absorber and improving the overall light absorption efficiency.

[0014] Furthermore, the top surface of the light-transmitting layer is lower than the surface of the absorption body. That is to say, the light-transmitting layer is recessed into the groove. This recessed structure can disperse thermal stress, reduce local thermal stress concentration, and prevent the material from deforming and being damaged due to thermal expansion. In addition, this recessed structure can protect the light-transmitting layer from external physical impacts and abrasions, improving the durability and service life of the absorber.

[0015] Advantages of the utility model:

[0016] By adopting a groove and a multi-layer light absorption structure, the light-transmitting layer allows laser light to pass through and reach the light absorption layer. At the same time, the conical protrusions and particle structures cause the incident light to be reflected multiple times inside the groove, gradually attenuated and absorbed. The light-transmitting layer confines the laser between the light-transmitting layer and the protrusions, enhancing the absorption of the laser by the light absorption layer, enabling the high-power laser absorber to absorb laser energy more efficiently, avoiding optical path interference and unnecessary reflections, and having good application prospects in the field of laser processing technology. Description of the drawings

[0017] Figure 1 is a schematic diagram of a high-power laser absorber.

[0018] In the figure: 1, absorption body; 2, light absorption layer; 3, light-transmitting layer; 11, protrusion. Detailed implementation manners

[0019] To make the purpose, technical solutions and advantages of the present application clearer, the following examples are given with reference to the attached drawings to further elaborate on the present application in detail.

[0020] The utility model provides a high-power laser absorber, such as Figure 1As shown in the figure, it includes an absorption body 1, a light absorption layer 2, a light-transmitting layer 3, and a protrusion 11. Taking the absorption of high-power 1064-nanometer laser as an example, the materials and dimensions of relevant components are given in this utility model. The material of the absorption body 1 is copper or copper alloy or aluminum alloy, and these materials have good thermal conductivity and mechanical strength. The thickness of the absorption body 1 is greater than 2 mm, and the surface is provided with grooves, and the depth of the grooves is 50-100 microns. The material of the protrusion 11 is the same as that of the absorption body 1, and it is processed at the bottom of the groove of the absorption body 1 during preparation, which also improves the thermal conductivity. The protrusion 11 is conical, the height of the cone is 2-10 microns, the bottom diameter is 4-10 microns, and the top diameter is close to 0 microns. The top of the cone faces the outside of the groove, and the height direction of the cone is consistent with the normal direction of the surface of the absorption body 1. There are multiple protrusions 11, and the protrusions 11 are arranged periodically, and the period is a hexagonal period, and the period length is 10-15 microns. Multiple protrusions 11 are placed at the bottom of the groove. The light absorption layer 2 covers the protrusion 11, and the material of the light absorption layer 2 is a carbon-based material, such as carbon black, graphene, or carbon nanotubes, and these materials have high light absorption rate and good thermal conductivity. The thickness of the light absorption layer 2 is greater than 10 microns, the light absorption layer 2 covers the top of the protrusion 11, and the top surface of the light absorption layer 2 is a flat surface. The material of the light-transmitting layer 3 is quartz glass or polycarbonate, and these materials have good light transmittance and mechanical protection performance. The thickness of the light-transmitting layer 3 is 2-5 microns, and the light-transmitting layer 3 covers the light absorption layer 2. The top surface of the light-transmitting layer 3 is lower than the surface of the absorption body 1, forming a concave structure.

[0021] During use, the high-power laser to be absorbed irradiates the light absorber of this utility model. When the 1064-nanometer high-power laser irradiates the surface of the absorber, the light first passes through the light-transmitting layer 3 and further irradiates the light absorption layer 2. The light absorption layer 2 absorbs the high-power laser, and the laser that is not absorbed by the light absorption layer 2 irradiates the conical protrusion 11. The conical protrusion 11 will cause multiple reflections, extending the path length of the light in the light absorption layer 2, increasing the chance of the light interacting with the light absorption layer 2, and improving the overall light absorption rate.

[0022] It should be noted that the protrusions of this utility model not only enhance light absorption but also enhance the heat dissipation ability.

[0023] On the basis of Embodiment 1, the protrusion 11 is a particle, specifically a sphere. The material of the particle is silicon or silicon carbide. The particles are in two layers. The particles close to the bottom of the groove are small in size, and the particles far from the bottom of the groove are large in size. Specifically, the distance between the particles close to the bottom of the groove is 1-2 microns, and the diameter of the particles far from the bottom of the groove is 3-5 microns. During preparation, first distribute spherical particles with a diameter of 1-2 microns at the bottom of the groove, and then distribute spherical particles with a diameter of 3-5 microns above them. The preparation method is simple.

[0024] In summary, the present utility model provides a high-power laser absorber, which includes an absorption body 1, a light absorption layer 2, a light-transmitting layer 3, and protrusions 11. The surface of the absorption body 1 is provided with grooves. There are multiple protrusions 11, and the multiple protrusions 11 are placed at the bottom of the grooves. The light absorption layer 2 covers the protrusions 11, and the light-transmitting layer 3 covers the light absorption layer 2. The present utility model improves the light absorption efficiency, reduces reflection and optical path interference, and also enhances the thermal management ability of the absorber, and is applicable to various high-power laser application scenarios.

[0025] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. A high-power laser absorber, characterized in that: It includes an absorption body, a light absorption layer, a light-transmitting layer, and protrusions. The surface of the absorption body is provided with grooves. There are multiple protrusions, and the multiple protrusions are placed at the bottom of the grooves. The light absorption layer covers the protrusions, and the light-transmitting layer covers the light absorption layer.

2. The high power laser absorber according to claim 1, characterized in that: The protrusion is in a cone shape, and the top of the cone faces the outside of the groove.

3. The high power laser absorber according to claim 2, characterized in that: The height direction of the cone is consistent with the normal direction of the surface of the absorption body.

4. The high-power laser absorber according to claim 3, characterized in that: The protrusions are arranged periodically.

5. The high power laser absorber according to claim 4, characterized in that: The period is a hexagonal period.

6. The high power laser absorber according to claim 1, characterized in that: The protrusions are particles.

7. The high power laser absorber according to claim 6, characterized in that: The protrusion is spherical.

8. The high power laser absorber according to claim 7, characterized in that: The particle is two-layered.

9. The high power laser absorber according to claim 8, characterized in that: The particle size near the bottom of the groove is small, and the particle size far from the bottom of the groove is large.

10. The high-power laser absorber according to any one of claims 1 to 9, characterized in that: The top surface of the light-transmitting layer is lower than the surface of the absorbing body.

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