High-power laser stray light absorption device

Abstract

The invention discloses a high-power laser stray light absorption device, and relates to the technical field of laser stray light treatment, the high-power laser stray light absorption device comprises a reflector and a heat conductor which are sequentially arranged on a light path, and the surface of one side, close to the reflector, of the heat conductor is provided with a wave absorption layer; a cooling channel is arranged in the heat conductor, and a cooling medium is introduced into the cooling channel; the surface, close to the reflector, of the wave absorbing layer is provided with a micro-nano structure array, and the surface of the micro-nano structure array is provided with a wave absorbing material coating. The high-power laser stray light absorption device not only can efficiently absorb stray light from a visible light band to a near-infrared band, but also has an active heat dissipation capability, and is prevented from losing efficacy due to overheating.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser stray light processing, and in particular to a high-power laser stray light absorption device. BACKGROUND

[0002] In laser, laser processing, optical communication and precision optical measurement systems, in addition to the main laser beam, unintended stray light will be generated due to the reflection, scattering, diffraction and other effects of optical elements. These stray light will seriously reduce the signal-to-noise ratio of the optical system, affect the measurement accuracy and processing quality. In high-power laser systems, stray light focused on the inner wall of the equipment or other components will generate a large amount of heat, causing damage to the original components, and even causing safety accidents.

[0003] At present, the common stray light processing method is to install a black paint surface or a commercial black cavity at the position where the light path needs to be blocked. However, ordinary black paint is easy to ablate and fall off under strong laser irradiation, and has limited absorption rate for specific wavelengths of laser such as near-infrared light; although the black cavity can improve the absorption rate of stray light, its heat dissipation capacity is poor, and long-term operation under high power will cause heat accumulation and excessive temperature rise. Not only will it change the physical properties of the black cavity, but it may also become a new heat radiation source, affecting the surrounding light path.

[0004] The traditional laser stray light absorption device mainly has the following shortcomings: first, the absorption mechanism is single, the traditional laser stray light absorption device usually only relies on ordinary black paint or simple black cavity to realize, and has the problems of incomplete absorption of wide-band and large-angle incident stray light, high reflectivity, easy generation of secondary stray light pollution, and reduction of system signal-to-noise ratio; second, the heat dissipation capacity is seriously insufficient, the traditional laser stray light absorption device mostly adopts passive heat dissipation, and the heat conduction path is not clear, which is easy to cause local overheating due to heat accumulation under high-power laser irradiation, causing layer ablation, falling off or substrate damage, poor reliability and short service life; third, the traditional laser stray light absorption device has a rough structure design, lacks effective heat management and light trap design, and cannot meet the harsh requirements of high-power and high-precision laser systems for stray light control and long-term stability. For example, a light trap for absorbing and suppressing laser stray light discloses that a reflector is provided with a reflection cavity with a tapered cross-section, although the stray light is absorbed, in the case of high laser emission power, the light trapped in the light trap will have a high temperature, becoming a new heat radiation source, affecting the light path of the entire system.

[0005] Therefore, we need a laser stray light absorption device that can efficiently absorb stray light from the visible light segment to the near-infrared band and has active heat dissipation capacity. SUMMARY

[0006] The present application provides a high-power laser stray light absorption device, which solves the problems of single absorption mechanism, rough design structure and poor heat dissipation of the prior art.

[0007] To achieve the above object, the present application adopts the following technical solutions: In a first aspect, the present application provides a high-power laser stray light absorption device, which comprises a reflector and a heat conductor arranged in sequence on an optical path, and a wave-absorbing layer is arranged on the surface of the heat conductor close to the reflector. The heat conductor is internally provided with a cooling channel, and a cooling medium is introduced into the cooling channel. The surface of the wave-absorbing layer close to the reflector is provided with a micro-nano structure array, and the surface of the micro-nano structure array is provided with a wave-absorbing material coating.

[0008] In a possible implementation, the wave-absorbing material coating is an ultrablack coating prepared by adding a light-absorbing agent to a resin material.

[0009] In a possible implementation, the light-absorbing agent is carbon black or carbon nanotube. The resin material is silicone or polyurethane.

[0010] In a possible implementation, the micro-nano structure array is a tetrahedral micro-nano array structure.

[0011] In a possible implementation, the heat conductor is prepared from a high-thermal-conductivity material.

[0012] In a possible implementation, the cooling channel is a serpentine channel comprising an inlet pipe and an outlet pipe, and the inlet pipe is provided with a cooling pump.

[0013] In a possible implementation, the cooling medium is deionized water.

[0014] In a possible implementation, it further comprises a first mounting seat for mounting the reflector and a second mounting seat for mounting the heat conductor.

[0015] The high-power laser stray light absorption device provided by the embodiment of the present application can reflect light path when high-power laser irradiates on the reflector, most of the light is reflected to other optical devices through the reflector, and the remaining stray light transmits through the reflector and irradiates on the wave-absorbing layer; when the stray light is incident, the micro-nano structure array and the wave-absorbing material coating of the wave-absorbing layer greatly increase the reflection times of the stray light on the surface of the wave-absorbing layer, most of the stray light is converted into heat energy through interference cancellation and the absorption of the material itself; the large amount of heat generated by the wave-absorbing layer is diffused laterally through the heat conductor, so as to avoid local overheating of the device; the cooling medium is introduced into the cooling channel in the heat conductor, so as to continuously take away the heat generated by the wave-absorbing layer through the heat conductor, realize active temperature control of the device, and ensure stable operation of the device under long-term high-power load. The high-power laser stray light absorption device can not only absorb stray light in the visible light segment to the near-infrared wave segment efficiently, but also has active heat dissipation capacity, so as to prevent the device from failing due to overheating. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a schematic diagram of the overall structure of a high-power laser stray light absorption device provided by the embodiment of the present application. Figure 2 The figure is a front view of a wave-absorbing layer of a high-power laser stray light absorption device provided by the embodiment of the present application. Figure 3 The figure is a side view of a wave-absorbing layer of a high-power laser stray light absorption device provided by the embodiment of the present application. Figure 4 The figure is a schematic diagram of the internal structure of a heat conductor of a high-power laser stray light absorption device provided by the embodiment of the present application.

[0017] Mark and description: 1, reflector; 2, heat conductor; 21, cooling channel; 22, inlet pipeline; 23, outlet pipeline; 3, wave-absorbing layer; 4, first mounting seat; 5, second mounting seat. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] Hereinafter, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise stated, the meaning of "a plurality of" is two or more. In addition, the use of "based on" or "according to" means open and inclusive, because the process, step, calculation or other action based on one or more stated conditions or values can be based on additional conditions or values beyond those stated in practice.

[0020] In order to solve the problems of single absorption mechanism, rough design structure and poor heat dissipation in the prior art, the embodiment of the present application provides a high-power laser stray light absorption device.

[0021] As shown in Figure 1 The embodiment of the present application provides a high-power laser stray light absorption device, which comprises a reflecting mirror 1 and a heat conductor 2 arranged in sequence on an optical path, and a wave-absorbing layer 3 is arranged on the surface of the heat conductor 2 close to the reflecting mirror 1.

[0022] Specifically, the high-power laser is reflected by the reflecting mirror 1, most of the light is reflected to other optical devices through the reflecting mirror 1, and the remaining part of the light transmits through the reflecting mirror 1 to the wave-absorbing layer 3 on the surface of the heat conductor 2. The wave-absorbing layer 3 is the first and most important defense line for stray light absorption.

[0023] The surface of the wave-absorbing layer 3 close to the reflecting mirror 1 is provided with a micro-nano structure array, and the surface of the micro-nano structure array is provided with a wave-absorbing material coating.

[0024] The micro-nano structure array is an ordered structure formed by micrometer or nanometer substructures arranged in a specific pattern, which is commonly used in the fields of optics and material science. Its core features include high-precision arrangement, small-size units and multi-functional applications. The micro-nano structure array usually refers to an array formed by micrometer or nanometer substructures (such as lenses, holes, lines, etc.) arranged in a specific order on a substrate.

[0025] The wave-absorbing material coating is a material coating applied in the form of a covering layer on the target surface to absorb or weaken the laser energy.

[0026] In the embodiment, the wave-absorbing layer 3 has a double wave-absorbing mechanism by combining the wave-absorbing material coating and the micro-nano structure array, and the stray light absorption rate of the wave-absorbing layer 3 for the wave band of 400nm-2000nm can reach 99.95% or more, which greatly improves the signal-to-noise ratio of the optical system.

[0027] The heat conductor 2 is internally provided with a cooling channel 21, and a cooling medium is introduced into the cooling channel 21.

[0028] In the embodiment, the heat management design of the heat conduction body 2 quickly conducts and actively dissipates heat by the internal cooling medium, effectively handles the kilowatt-level heat load generated by high-power laser stray light, and prevents the device from failing due to overheating.

[0029] In actual application, the high-power laser stray light absorption device provided by the embodiment of the present application is irradiated by high-power laser on the reflector 1 to reflect the light path, most of the light is reflected to other optical devices through the reflector 1, and the remaining stray light is irradiated on the wave-absorbing layer 3 through the reflector 1; when the stray light is incident, the micro-nano structure array and the wave-absorbing material coating of the wave-absorbing layer 3 greatly increase the reflection times of the stray light on the surface of the wave-absorbing layer 3, most of the stray light is converted into heat energy through interference cancellation and the absorption of the material itself; the large amount of heat generated by the wave-absorbing layer 3 is diffused laterally through the heat conduction body 2, so as to avoid local overheating of the device; the cooling medium is introduced into the cooling channel 21 inside the heat conduction body 2, so as to continuously take away the heat generated by the wave-absorbing layer 3 by absorbing laser stray light through the heat conduction body 2, so as to realize active temperature control of the device and ensure stable operation of the device under long-term high-power load.

[0030] The high-power laser stray light absorption device of the present application can not only efficiently absorb stray light in the visible light segment to the near-infrared wave segment, but also has active heat dissipation capability to prevent the device from failing due to overheating.

[0031] Further, the wave-absorbing material coating is an ultrablack coating prepared by adding a light absorber to a resin material.

[0032] Further, the light absorber is carbon black or carbon nanotube. The resin material is silicone resin or polyurethane.

[0033] In the embodiment, the wave-absorbing material coating is prepared by adding carbon black, carbon nanotube and the like as a light absorber to a resin material such as silicone resin or polyurethane. This composite material combines the excellent light absorption performance of the light absorber and the processability, flexibility and environmental stability of the resin matrix.

[0034] The preparation method of the wave-absorbing material coating mainly includes coating process and sol-gel method. Among them, the coating process is the most commonly used method, the light absorber (such as carbon black, carbon nanotube) is mixed with a dispersant, an adhesive such as epoxy resin or polyurethane, and stirred into a slurry, which is coated on the surface of the substrate by brushing or other methods, and a coating is formed after curing; the sol-gel method forms a uniform film or coating on the substrate through the sol-gel process, and a coating with relatively uniform performance is obtained.

[0035] Carbon black and carbon nanotube and other materials can effectively absorb electromagnetic waves or light energy due to their unique electronic structure and surface properties, which is the key to endowing the coating with wave-absorbing or light-absorbing function.

[0036] Organic polymer materials such as silicone resin and polyurethane provide coatings with good flexibility, adhesion and environmental stability, enabling them to adapt to different application scenarios.

[0037] like Figure 2 , Figure 3 As shown, the micro-nano structure array is further a tetrahedral micro-nano array structure.

[0038] Among them, the tetrahedral micro-nano array structure is a nanoscale arrangement structure composed of multiple tetrahedral units.

[0039] Furthermore, the heat conductor 2 is made of a high thermal conductivity material.

[0040] In this embodiment, the heat conductor 2 is closely attached to the side of the absorbing layer 3 away from the reflector 1, and is made of a high thermal conductivity material such as copper. It is used to quickly diffuse the heat generated by the absorbing layer 3 laterally and avoid local overheating of the device.

[0041] like Figure 4 As shown, the cooling channel 21 is a serpentine channel, including an inlet pipe 22 and an outlet pipe 23, with a cooling pump installed in the inlet pipe 22.

[0042] Furthermore, the cooling medium is deionized water.

[0043] In this embodiment, the heat conductor 2 adopts a serpentine cooling channel. Deionized water is pumped into the inlet pipe 22 by a cooling pump. After flowing through the entire serpentine channel, the deionized water is discharged from the outlet. The heat generated by the stray light absorbed by the absorber is continuously carried away by the heat conductor 2, realizing active temperature control of the device and ensuring stable operation of the device under long-term high power load.

[0044] like Figure 1 As shown, it further includes a first mounting base 4 for mounting the reflector 1 and a second mounting base 5 for mounting the heat conductor 2.

[0045] In this embodiment, the first mounting base 4 and the second mounting base 5 are arranged sequentially and parallel to each other in the optical path of the optical system. The first mounting base 4 and the reflector 1 mounted thereon constitute a reflection module, and the second mounting base 5 and the heat conductor 2 mounted thereon, together with the absorber on the surface of the heat conductor 2, constitute an absorption module. The modular design of this invention makes the device easy to integrate into existing laser systems, and it can be used in a wide range of applications, from low-power precision measurements to high-power industrial processing equipment.

[0046] The high-power laser stray light absorption device of the present invention is not only compact in structure and widely applicable, but also has an extremely high absorption rate, capable of absorbing lasers from the visible to near-infrared bands simultaneously, with an absorption rate >99.9%; it also has a highly efficient active heat dissipation capability, effectively preventing the device from failing due to overheating.

[0047] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high power laser stray light absorption device, characterized in that, The application relates to a heat-conducting mirror, which comprises a mirror and a heat-conducting body arranged in sequence in an optical path, wherein a wave-absorbing layer is arranged on the surface of the heat-conducting body close to the mirror. The heat-conducting body is internally provided with a cooling channel, and cooling medium is introduced into the cooling channel. The surface of the wave-absorbing layer close to the mirror is provided with a micro-nano structure array, and the surface of the micro-nano structure array is provided with a wave-absorbing material coating.

2. The high-power laser stray light absorbing device of claim 1, wherein, The wave-absorbing material coating is an ultra-black coating prepared by adding a light-absorbing agent into a resin material.

3. The high-power laser stray light absorbing device of claim 2, wherein, The light-absorbing agent is carbon black or carbon nanotube. The resin material is silicon resin or polyurethane.

4. The high-power laser stray light absorbing device of claim 1, wherein, The micro-nano structure array is a tetrahedral micro-nano array structure.

5. The high-power laser stray light absorbing device of claim 1, wherein, The heat-conducting body is prepared from high-heat-conducting material.

6. The high-power laser stray light absorbing device of claim 1, wherein, The cooling channel is a serpentine channel, which comprises an inlet pipeline and an outlet pipeline, and the inlet pipeline is provided with a cooling pump.

7. The high-power laser stray light absorbing device of claim 6, wherein, The cooling medium is deionized water.

8. The high-power laser stray light absorbing device of claim 1, wherein, The application further comprises a first mounting seat for mounting the mirror and a second mounting seat for mounting the heat-conducting body.

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