Alumina ceramic microbead laser absorption device

Abstract

The utility model relates to an alumina ceramic microbead laser absorption device, which belongs to the technical field of lasers and comprises a lens barrel and an absorption barrel, the absorption barrel is fixedly connected to one end of the lens barrel, one end of the lens barrel far away from the absorption barrel is provided with a first mounting blind hole, and the other end of the lens barrel is provided with a light channel hole. The end, away from the absorption cylinder, of the light channel hole communicates with the first installation blind hole, an incident lens is fixedly installed in the first installation hole, a second installation blind hole is formed in the end, close to the lens cylinder, of the absorption cylinder, and a sealing window piece is fixedly installed in the second installation blind hole in a sealed mode. According to the utility model, the absorption bead is used as a carrier for absorbing residual laser, so that the size is reduced, and the absorption bead is more suitable for a laser with a compact size; and the laser is absorbed by the absorption beads, so that the incident lens is prevented from being damaged, and the laser absorption effect is improved.

Description

Technical Field

[0001] The utility model relates to an alumina ceramic micro-bead laser absorption device, belonging to the technical field of lasers. Background Art

[0002] Stray light collection is a way to block and absorb non-use light sources in the optical path to protect personnel and optical components from damage. The general application scenarios require that the stray light absorption device absorbs energy, does not generate dust to cause pollution, and the reflected light does not damage the original optical path, thereby ensuring the quality of the machine laser beam.

[0003] The Chinese utility model patent with publication number CN208721821U discloses a stray laser absorption device, including an absorption base and a reflective component. The surface of the absorption base is provided with a fixed groove, a frosted glass piece is embedded in the fixed groove and serves as the laser incident port of the absorption base. The absorption base is provided with a hollow absorption cavity at the position corresponding to the laser incident port. The reflective component is fixed in the absorption cavity. The stray laser is taken into the absorption cavity through the laser incident port of the absorption base and is reflected by the reflective component to the surface of the absorption cavity and absorbed by the absorption base. The utility model has a good absorption effect for low-energy stray laser beams, and has a simple structure, convenient processing and installation, and further reduces production costs.

[0004] However, the prior art still has the following deficiencies:

[0005] 1. The design is complex and bulky, making it difficult to apply to compact lasers;

[0006] 2. The absorption cone that receives the laser cannot withstand high-energy-density laser irradiation. Each pulse of laser will cause the absorption cone to lose some material. The absorption cone will eventually lose its reflection characteristics and damage the frosted glass sheet, causing a large amount of laser to be reflected back into the laser at the frosted glass sheet, affecting the subsequent laser absorption effect;

[0007] 3. The materials used release harmful gases under laser irradiation, which pollute the optical components inside the laser and cause damage to the laser.

[0008] Therefore, there is a need for an alumina ceramic microbead laser absorption device that can reduce the volume, improve the laser absorption effect, and avoid the generation of harmful gases. Utility Model Content

[0009] The technical problem to be solved by the utility model is: in order to overcome the deficiencies of the prior art, to provide an alumina ceramic micro-bead laser absorption device with reduced volume, improved laser absorption effect, and avoid generation of harmful gases.

[0010] The technical solution adopted by the utility model to solve the above-mentioned problem is: an alumina ceramic micro-bead laser absorption device, comprising a lens tube and an absorption tube, the absorption tube is fixedly connected to one end of the lens tube, the end of the lens tube away from the absorption tube is provided with a first mounting blind hole, the other end of the lens tube is provided with a light path hole, the end of the light path hole away from the absorption tube is connected with the first mounting blind hole, an incident lens is fixedly installed in the first mounting hole, a second mounting blind hole is provided at the end of the absorption tube close to the lens tube, a sealing window piece is fixedly and sealedly installed in the second mounting blind hole, a third mounting blind hole is provided on the inner end surface of the second mounting blind hole, and a plurality of absorption beads are provided in the third mounting blind hole.

[0011] Preferably, the absorption beads are made of alumina ceramics.

[0012] Preferably, one end of the incident lens close to the light path hole is provided with an arc-shaped concave, and the other end of the incident lens is a plane.

[0013] Preferably, a plurality of absorbent beads are distributed in an array.

[0014] Preferably, the diameter of the absorbent beads is 0.4 mm to 0.1 mm.

[0015] Preferably, the sealing window piece is arranged tilted.

[0016] Preferably, the inclination angle between the sealing window piece and the axis of the optical path hole is 86° to 88°.

[0017] Preferably, the light path hole is a tapered hole, the small diameter end of the light path hole is arranged towards the first mounting hole, the first mounting blind hole is arranged coaxially with the light path hole, the aperture of the first mounting blind hole is larger than the small diameter of the light path hole, and the aperture of the first mounting blind hole is smaller than the large diameter of the light path hole.

[0018] Preferably, a flange is provided at one end of the absorption tube close to the lens tube, and an annular groove is coaxially provided on the outer peripheral wall of the lens tube, the annular groove extends to the end of the lens tube close to the absorption tube, and the flange is fixedly sleeved on the inner wall of the annular groove.

[0019] Preferably, both ends of the incident lens are coated with anti-reflection films, and one end of the sealing window piece close to the lens barrel is coated with an anti-reflection film.

[0020] Compared with the prior art, the advantages of the utility model are:

[0021] 1. By using absorption beads as carriers to absorb the remaining laser light, the volume is reduced, making it more suitable for compact lasers;

[0022] 2. Absorbing beads are used to absorb laser light, which can avoid damaging the incident lens and improve the laser absorption effect;

[0023] 3. The alumina ceramic absorber has a high damage threshold, which can prevent laser irradiation from producing harmful gases or dust and causing pollution;

[0024] 4. Use a negative lens to further diverge the laser beam, reduce the laser energy density, and improve the reliability of laser absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional diagram of an alumina ceramic micro-bead laser absorption device of the utility model;

[0026] Figure 2 This is a cross-sectional view of an alumina ceramic micro-bead laser absorption device of the utility model;

[0027] Figure 3 is a cross-sectional view of the lens barrel;

[0028] Figure 4 A cross-sectional view of the absorption tube.

[0029] Among them: lens tube 1, absorption tube 2, first mounting blind hole 3, light path hole 4, incident lens 5, second mounting blind hole 6, sealing window piece 7, third mounting blind hole 8, absorption bead 9, flange 10, annular groove 11. DETAILED DESCRIPTION

[0030] like Figure 1-4 As shown, an alumina ceramic micro-bead laser absorption device in this embodiment includes a lens tube 1 and an absorption tube 2, wherein the absorption tube 2 is fixedly connected to one end of the lens tube 1, and a first mounting blind hole 3 is provided at the end of the lens tube 1 away from the absorption tube 2, and a light path hole 4 is provided at the other end of the lens tube 1, wherein the light path hole 4 is a tapered hole, and the small diameter end of the light path hole 4 is arranged toward the first mounting hole, and the small diameter end of the light path hole 4 is connected with the first mounting blind hole 3, and an incident lens 5 is fixedly installed in the first mounting hole, and an arc-shaped concave is provided at the end of the incident lens 5 close to the light path hole 4, and the other end of the incident lens 5 is a plane. A second mounting blind hole 6 is provided at one end of the absorption tube 2 close to the lens tube 1, a sealing window piece 7 is fixedly and sealedly installed in the second mounting blind hole 6, a third mounting blind hole 8 is provided on the inner end surface of the second mounting blind hole 6, a plurality of absorption beads 9 are provided in the third mounting blind hole 8, and the absorption beads 9 are made of alumina ceramics. The laser beam is incident on the incident lens 5, and after being diverged by the incident lens 5, it is incident on the sealing window piece 7 from the light path hole 4 with a lower energy density and a larger angle, and then is incident on the surface of the absorption beads 9 through the sealing window piece 7. Here, the incident lens 5 is actually a negative lens, and its light aperture is slightly larger than the beam diameter;

[0031] Among them, the Mohs hardness of alumina ceramics is 9, the melting point is 2050°C, the resistivity is 1015Ω·cm, and it has excellent chemical stability. In solid lasers, alumina ceramics can be used as a focusing cavity reflector, and its light reflectivity in the wide spectrum range of 500nm to 2000nm exceeds 96%. Due to its excellent physical and chemical properties, its laser damage threshold is much higher than that of metal materials. At the same time, it has high reflection characteristics for lasers. Alumina ceramics are used as a carrier to absorb the remaining laser. The laser is incident on the surface of the absorption bead 9, and its reflection obeys the law of reflection of light. In this way, most of the laser is reflected by the absorption bead 9 to the periphery and then reflected again by other absorption beads 9. In this way, the absorption beads 9 are reflected and absorbed multiple times, and finally the energy is exhausted;

[0032] In the prior art, the absorption cone needs to maintain a high reflectivity to the laser for a long time and cannot be damaged by the laser, otherwise the sputtered metal powder will adhere to the frosted glass sheet, causing the laser to be reflected back to the inside of the laser in large quantities. From the mechanism of interaction between the pulsed laser and the material, it can be seen that the laser transfers energy to the free electrons in the metal through photon excitation, thereby melting, gasifying and removing the material. Since there are a large number of free electrons in the metal, even the metal with a very high surface finish has a laser damage threshold lower than the power density of the pulsed laser. Therefore, the absorption cone will be damaged by the pulsed laser in a very short time to produce spatter, thereby destroying the sealing window sheet 7 and causing the remaining laser to return to the window sheet along the original path.

[0033] Compared with the prior art, the absorption beads 9 are used to absorb the laser, which can avoid damaging the incident lens 5 and improve the laser absorption effect;

[0034] On the other hand, because the alumina ceramic absorbing beads 9 have a high anti-damage threshold, and the spherical surface actually further reduces the energy density of the laser on the absorbing beads 9, the absorbing beads 9 can withstand laser radiation for a long time without being damaged. Moreover, laser irradiation does not produce harmful gases or dust, so it can be used for a long time without pollution, avoiding damage to the laser.

[0035] Secondly, by using the absorption beads 9 to replace the absorption cones in the prior art, the volume is reduced, so that it is more suitable for compact lasers;

[0036] A plurality of absorbent beads are arranged in 9 arrays;

[0037] The first mounting blind hole 3, the light path hole 4 and the third mounting blind hole 8 are coaxially arranged;

[0038] The aperture of the first mounting blind hole 3 is larger than the minor diameter of the optical path hole 4, and the aperture of the first mounting blind hole 3 is smaller than the major diameter of the optical path hole 4;

[0039] The end of the absorption tube 2 close to the lens tube 1 is provided with a flange 10, and the outer peripheral wall of the lens tube 1 is coaxially provided with an annular groove 11, and the annular groove 11 extends to the end of the lens tube 1 close to the absorption tube 2, and the flange 10 is fixedly sleeved on the inner wall of the annular groove 11, and the flange 10 is threadedly connected to the inner wall of the annular groove 11;

[0040] The lens tube 1 is made of stainless steel, and the absorption tube 2 is made of aluminum or stainless steel;

[0041] The ball diameter of the absorbent beads 9 is 0.4 mm to 0.1 mm;

[0042] The sealing window sheet 7 is arranged tilted, and the tilt angle between the sealing window sheet 7 and the axis of the light path hole 4 is 86° to 88°, so that the laser is tilted to the absorbing bead 9, which is convenient for the laser to be reflected multiple times on the absorbing bead 9;

[0043] The material of the incident lens 5 is K9 (leaded glass) or JGS1 (optical quartz glass), and the material of the sealing window piece 7 is K9 (leaded glass) or JGS1 (optical quartz glass);

[0044] Both ends of the incident lens 5 are coated with an anti-reflection film, and the end of the sealing window 7 close to the lens barrel 1 is coated with an anti-reflection film. The anti-reflection film is a surface optical coating that increases the transmittance of light on the surface by reducing reflected light;

[0045] In summary, the device reduces its volume by using absorption beads 9 as carriers for absorbing the remaining laser light, thereby being more suitable for use in compact lasers. The absorption beads 9 are used to absorb the laser light, thereby avoiding damage to the incident lens 5 and improving the laser absorption effect. The absorption beads 9 made of alumina ceramic have a high damage resistance threshold, thereby avoiding pollution caused by harmful gases or dust generated by laser irradiation. A negative lens is used to further diverge the laser beam, thereby reducing the laser energy density and improving the reliability of the absorption box.

[0046] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. An alumina ceramic micro-bead laser absorption device, comprising a lens tube (1) and an absorption tube (2), wherein the absorption tube (2) is fixedly connected to one end of the lens tube (1), and a first mounting blind hole (3) is provided at one end of the lens tube (1) away from the absorption tube (2), and a light path hole (4) is provided at the other end of the lens tube (1), wherein the light path hole (4) is a tapered hole, and the small diameter end of the light path hole (4) is arranged toward the first mounting hole, and the first mounting blind hole (3) is coaxially arranged with the light path hole (4), and the aperture of the first mounting blind hole (3) is larger than the small diameter of the light path hole (4), and the aperture of the first mounting blind hole (3) is smaller than the large diameter of the light path hole (4); the end of the light path hole (4) away from the absorption tube (2) is connected to the first mounting blind hole (3), and an incident lens (5) is fixedly installed in the first mounting hole, characterized in that: A second mounting blind hole (6) is provided at one end of the absorption tube (2) close to the lens tube (1), a sealing window sheet (7) is fixedly and sealingly installed in the second mounting blind hole (6), a third mounting blind hole (8) is provided on the inner end surface of the second mounting blind hole (6), and a plurality of absorption beads (9) are provided in the third mounting blind hole (8).

2. The alumina ceramic micro-bead laser absorption device according to claim 1, characterized in that: The material of the absorption beads (9) is alumina ceramics.

3. The alumina ceramic micro-bead laser absorption device according to claim 1, characterized in that: An arc-shaped concave is provided at one end of the incident lens (5) close to the light path hole (4), and the other end of the incident lens (5) is a flat surface.

4. The alumina ceramic micro-bead laser absorption device according to claim 1, characterized in that: A plurality of absorbent beads (9) are arranged in an array.

5. The alumina ceramic micro-bead laser absorption device according to claim 1, characterized in that: The ball diameter of the absorbent beads (9) is 0.4 mm to 0.1 mm.

6. The alumina ceramic micro-bead laser absorption device according to claim 1, characterized in that: The sealing window piece (7) is arranged tilted.

7. The alumina ceramic micro-bead laser absorption device according to claim 6, characterized in that: The inclination angle between the sealing window piece (7) and the axis of the light path hole (4) is 86° to 88°.

8. The alumina ceramic micro-bead laser absorption device according to claim 1, characterized in that: A flange (10) is provided at one end of the absorption tube (2) close to the lens tube (1), and an annular groove (11) is coaxially provided on the outer peripheral wall of the lens tube (1), the annular groove (11) extending to the end of the lens tube (1) close to the absorption tube (2), and the flange (10) is fixedly sleeved on the inner wall of the annular groove (11).

9. The alumina ceramic micro-bead laser absorption device according to claim 1, characterized in that: Both ends of the incident lens (5) are coated with an anti-reflection film, and the end of the sealing window piece (7) close to the lens barrel (1) is coated with an anti-reflection film.

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