CN217133482U

CN217133482U - Collimator of optical fiber laser

Info

Publication number: CN217133482U
Application number: CN202123389287.6U
Authority: CN
Inventors: 谢绍平; 邹萌; 张永平; 刘开威; 朱忽
Original assignee: Wuhan Raycus Fiber Laser Technologies Co Ltd
Current assignee: Wuhan Raycus Fiber Laser Technologies Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-08-05
Anticipated expiration: 2031-12-30

Abstract

The utility model relates to the field of laser technology, a collimator of fiber laser is disclosed, include: an optical fiber, a G-lens, a first glass tube and a second glass tube; one end of the optical fiber is welded with the G-lens; the optical fiber is arranged in the first glass tube, and a coating layer of the optical fiber is bonded with the first glass tube; the first glass tube and the G-lens are arranged in the second glass tube, and the first glass tube and the G-lens are respectively bonded with the second glass tube. The technical scheme of the utility model spherical aberration that can reduce the collimator reduces and returns light, improves the light beam quality of laser instrument output.

Description

Collimator of optical fiber laser

Technical Field

The utility model relates to a laser technical field especially relates to a collimator of fiber laser.

Background

The application range of high-power fiber lasers is continuously expanded, and the high-power fiber lasers are widely applied to aspects of part marking, cutting, drilling, welding, cleaning, medical operations and the like at present. Higher requirements are also placed on the laser as a whole, such as high output power, high photoelectric efficiency and good beam quality, and thus higher requirements are also placed on the fiber collimator.

The mainstream technology for manufacturing the collimator of the high-power laser in the market at present is to expand the optical fiber, weld a small section of coreless optical fiber, and align and match the small section of coreless optical fiber with the spherical lens C-lens. The principle of the C-lens is that the outgoing end is a curved surface to realize the collimation of the laser, but the spot aberration is inevitably caused, so that the quality of the light beam is reduced, and the processing performance of the optical fiber laser is further influenced. And because the laser passes through three medium surfaces in the collimator, the laser can bring the return light of the laser, and the stability of the laser system is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a collimator of fiber laser to improve the light beam quality of laser output.

The embodiment of the utility model provides a collimator of fiber laser, include:

the device comprises an optical fiber, a Greens lens G-lens, a first glass tube and a second glass tube;

one end of the optical fiber is welded with the G-lens;

the optical fiber is arranged in the first glass tube, and a coating layer of the optical fiber is bonded with the first glass tube;

the first glass tube and the G-lens are arranged in the second glass tube, and the first glass tube and the G-lens are respectively bonded with the second glass tube.

Optionally, the optical fiber is a large-core passive optical fiber.

Optionally, a coating layer is stripped on a part of the optical fiber close to the G-lens.

Optionally, the optical fiber is stripped of the coating layer, and the optical fiber cladding is not in contact with the adhesive for adhesion, the first glass tube and the second glass tube.

Optionally, the emergent end face of the G-lens is an inclined plane, and an antireflection film with a high damage threshold value is plated.

Optionally, the exit end face of the G-lens protrudes out of the second glass tube.

Optionally, the first glass tube and the second glass tube are quartz glass tubes.

Optionally, the inner diameter of the second glass tube is consistent with the outer diameter of the first glass tube and the G-lens.

The embodiment of the utility model provides a collimator of fiber laser adopts G-lens to avoid the problem that the light beam quality that spherical lens caused descends in the design, and optic fibre and the direct butt fusion of G-lens reduce the medium face, can reduce back to return light to improve the light beam quality of laser output.

Drawings

Fig. 1 is a schematic structural diagram of a collimator of a fiber laser according to an embodiment of the present invention;

fig. 2 is a G-lens optical schematic diagram in an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Examples

Fig. 1 is a schematic structural diagram of a collimator of a fiber laser device according to an embodiment of the present invention, and this embodiment is applicable to a fiber laser device. As shown in fig. 1, a collimator of a fiber laser includes: optical fiber 1, G-lens2, first glass tube 3, and second glass tube 4.

One end of the optical fiber 1 is welded with the G-lens 2; the optical fiber 1 is arranged in the first glass tube 3, and the coating layer of the optical fiber 1 is bonded with the first glass tube 3; first glass tube 3 and G-lens2 were placed inside second glass tube 4, and first glass tube 3 and G-lens2 were bonded to second glass tube 4, respectively.

The coating layer of the optical fiber 1 and the first glass tube 3 may be adhered together by glue, for example, epoxy glue may be used. First glass tube 3 and G-lens2 may also be glued together with second glass tube 4 by glue. The optical fiber 1 is connected with the G-lens2 in a direct fusion mode, so that no medium surface exists between the optical fiber and the G-lens, the number of medium surfaces in the light beam transmission process is reduced, and the return light can be reduced. And the adoption of the G-lens avoids the problem of light beam quality reduction caused by the spherical lens in design, ensures the stability of light spots and ensures the continuous and stable output of the system.

The optical fiber 1 may be a large core passive optical fiber. The portion of optical fiber 1 near G-lens2 may be stripped using a coating stripping apparatus. The coated portion of the optical fiber 1 is exposed, and the fiber clad is not in contact with the adhesive for adhesion, the first glass tube 3, and the second glass tube 4. I.e. the coating-removed part of the optical fibre 1 is suspended in the second glass tube 4.

Optionally, the emergent end face of the G-lens2 is an inclined plane, and an antireflection film with a high damage threshold value is plated. The exit end face of the G-lens2 is arranged to be flat, and the exit end of the G-lens is angled, so that the return light of the light beam exiting through the G-lens2 is reduced. The exit end face of G-lens2 may protrude from second glass tube 4.

The first glass tube 3 and the second glass tube 4 may be quartz glass tubes. The inner diameter of second glass tube 4 corresponds to the outer diameter of first glass tube 3 and G-lens 2. The second glass tube 4 and the first glass tube 3, and the second glass tube 4 and the G-lens2 are tightly adhered, so that the mechanical property and the heat dissipation property can be enhanced.

Although the invention has been described in detail in the foregoing by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that certain modifications and improvements may be made thereto based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A collimator for a fiber laser, comprising:

the optical fiber (1), the G-lens (2), the first glass tube (3) and the second glass tube (4);

one end of the optical fiber (1) is welded with the G-lens (2);

the optical fiber (1) is arranged in the first glass tube (3), and a coating layer of the optical fiber (1) is bonded with the first glass tube (3);

the first glass tube (3) and the G-lens (2) are arranged in the second glass tube (4), and the first glass tube (3) and the G-lens (2) are respectively bonded with the second glass tube (4).

2. Collimator of a fiber laser according to claim 1, characterized in that the fiber (1) is a large core passive fiber.

3. The collimator of a fiber laser according to claim 1, characterized in that the portion of the fiber (1) close to the G-lens (2) is coated with a stripping layer.

4. The collimator of a fiber laser according to claim 3, characterized in that the fiber (1) is stripped of its coating, the fiber cladding not being in contact with the adhesive for bonding, the first glass tube (3) and the second glass tube (4).

5. The collimator of the fiber laser as claimed in claim 1, wherein the exit end face of the G-lens (2) is a bevel and is plated with an antireflection film with a high damage threshold.

6. Collimator of a fiber laser according to claim 5, characterized in that the exit end face of the G-lens (2) protrudes out of the second glass tube (4).

7. Collimator of a fiber laser according to claim 1, characterized in that said first glass tube (3) and said second glass tube (4) are quartz glass tubes.

8. Collimator of fiber laser according to claim 1, characterized in that the inner diameter of the second glass tube (4) coincides with the outer diameter of the first glass tube (3) and the G-lens (2).