Red light leading-in device, power detection device and fiber laser

Abstract

The utility model relates to the technical field of fiber lasers, and discloses a red light leading-in device, a power detection device and a fiber laser, the red light leading-in device comprises a first beam combining unit and a second beam combining unit, the first beam combining unit comprises two first beam combining input ends and a first beam combining output end, the second beam combining unit comprises a middle beam combining input end, at least one second beam combining input end and a second beam combining output end; one first beam combining input end is used for inputting red light, and the first beam combining output end is connected with the middle beam combining input end; in actual use, the first beam combining output end of the first beam combining unit is connected with the middle beam combining input end of the second beam combining unit, so that red light input from the first beam combining input end of the first beam combining unit can be transmitted in a fiber core of the second beam combining output end of the second beam combining unit, and the red light is prevented from being leaked when passing through the CPS; and the power of the finally output red light is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber lasers, in particular to a red light introduction device, a power detection device and an optical fiber laser. Background Art

[0002] As a highly efficient tool, fiber lasers are widely used in laser fiber communications, laser space long-distance communications, industrial shipbuilding, automobile manufacturing, laser engraving, laser marking, laser cutting, printing roller making, metal / non-metal drilling / cutting / welding, and medical equipment and other fields.

[0003] Currently, most single-mode fiber lasers use the Nx1 beam combining scheme to combine the pump and red light into one output fiber. After the red light is combined, most of it goes in the middle of the cladding. After the red light passes through the CPS at the back of the optical path, most of the red light in the cladding is leaked, resulting in a lower final output red light power.

[0004] In addition, the power detection of existing fiber lasers is to directly use a detector placed on the surface of the optical fiber, and indirectly detect the laser light power by detecting the light scattered from the outermost layer of the optical fiber, which has the problem of inaccurate detection. Utility Model Content

[0005] In view of the shortcomings of the background technology, the utility model provides a red light introduction device, a power detection device and an optical fiber laser, and the technical problem to be solved is that the red light output power of the current optical fiber laser is low and the power detection is inaccurate.

[0006] In order to solve the above technical problems, in a first aspect, the utility model provides the following technical solutions: a red light introduction device, comprising a first beam combining unit and a second beam combining unit, wherein the first beam combining unit comprises two first beam combining input ends and a first beam combining output end, and the second beam combining unit comprises an intermediate beam combining input end, at least one second beam combining input end and a second beam combining output end;

[0007] A first beam combining input end is used to input red light, and the first beam combining output end is connected to the intermediate beam combining input end.

[0008] In certain embodiments of the first aspect, the first beam combining unit includes a 2x1 beam combiner.

[0009] In a certain embodiment of the first aspect, the second beam combining unit includes a (N+1)x1 beam combiner, and the intermediate optical fiber of the (N+1)x1 beam combiner is the intermediate beam combining input end.

[0010] In certain implementations of the first aspect, N is greater than or equal to 2 and is a positive integer.

[0011] In certain embodiments of the first aspect, the intermediate beam combining input end is aligned with the first beam combining output end.

[0012] In certain embodiments of the first aspect, the intermediate beam combining input end is aligned with the second beam combining output end.

[0013] In a certain embodiment of the first aspect, the red light introducing device further includes a pump, and the pump is connected to the second beam combining input end of the second beam combining unit.

[0014] In a certain embodiment of the first aspect, the red light introducing device further includes a cladding light filter, and the second beam combining output end is connected to the cladding light filter.

[0015] In a second aspect, the utility model provides a power detection device, comprising the above-mentioned red light introduction device, and further comprising a detector, wherein the detector is connected to another first beam combining input end of the first beam combining unit.

[0016] In a third aspect, the utility model provides a fiber laser, comprising the above-mentioned power detection device.

[0017] Compared with the prior art, the utility model has the following beneficial effects: by connecting the first beam combining output end of the first beam combining unit with the intermediate beam combining input end of the second beam combining unit, the red light input from the first beam combining input end of the first beam combining unit can be transmitted in the fiber core of the second beam combining output end of the second beam combining unit, thereby avoiding leakage of the red light when passing through the CPS, thereby increasing the power of the final output red light;

[0018] In addition, by connecting the first beam combining output end of the first beam combining unit with the middle beam combining input end of the second beam combining unit, the returned laser can pass through the first beam combining unit to reach the detector for detection, so there is no need to detect at the outermost layer of the optical fiber, thereby improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a first structure of a red light introduction device in an embodiment;

[0020] Figure 2 is a second structural schematic diagram of the red light introduction device in the embodiment;

[0021] Figure 3 Schematic diagram of the structure of the power detection device in the embodiment. DETAILED DESCRIPTION

[0022] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0023] like Figure 1 As shown, a red light introduction device includes a first beam combining unit 1 and a second beam combining unit 2, wherein the first beam combining unit 1 includes two first beam combining input terminals 10 and a first beam combining output terminal 11, and the second beam combining unit 2 includes an intermediate beam combining input terminal 21, at least one second beam combining input terminal 20 and a second beam combining output terminal 22;

[0024] A first beam combining input terminal 10 is used to input red light, and a first beam combining output terminal 11 is connected to an intermediate beam combining input terminal 21 .

[0025] Specifically, in this embodiment, the first beam combining unit 1 includes a 2x1 beam combiner. The second beam combining unit 2 includes an (N+1)x1 beam combiner, and the intermediate optical fiber of the (N+1)x1 beam combiner is the intermediate beam combining input end 21. Wherein N is greater than or equal to 2 and is a positive integer.

[0026] In actual use, by connecting the first beam-combining output end 11 of the first beam-combining unit 1 with the intermediate beam-combining input end 41 of the second beam-combining unit 2, most of the red light input from the first beam-combining input end 10 of the first beam-combining unit 1 can be transmitted in the fiber core connected to the second beam-combining output end 22 of the second beam-combining unit 2, thereby avoiding leakage of the red light when passing through the CPS, thereby increasing the power of the final output red light.

[0027] Specifically, in this embodiment, the intermediate beam combining input terminal 41 is aligned with the first beam combining output terminal 11. The intermediate beam combining input terminal 21 is aligned with the second beam combining output terminal 22. In actual use, by aligning the intermediate beam combining input terminal 41 with the first beam combining output terminal 11 and aligning the intermediate beam combining input terminal 21 with the second beam combining output terminal 22, the red light can be returned from the second beam combining unit 2 to the first beam combining input terminal of the first beam combining unit 1, and the returned red light can be used for power detection.

[0028] Specifically, in this embodiment, Figure 2 As shown, the red light introduction device further includes a pump 3, which is connected to the second beam combining input end 20 of the second beam combining unit 2. The red light introduction device further includes a cladding light filter 4, and the second beam combining output end 22 is connected to the cladding light filter 4.

[0029] In addition, this embodiment further provides a power detection device, including the above-mentioned red light introduction device, and also including a detector 5 , and the detector 5 is connected to another first beam combining input end 10 of the first beam combining unit 1 .

[0030] In actual use, compared with detecting the laser power at the outermost layer of the optical fiber, the power detection device in this embodiment can directly detect the laser optical power by connecting the detector 5 to the other first beam combining input end 10 of the first beam combining unit 1, thereby improving the optical power detection accuracy of the optical fiber laser, wherein the detector 5 can be a PD detector. In addition, the influence of excessive returned laser on the red laser can be avoided by adjusting the splitting ratio of the 2x1 beam combiner.

[0031] In addition, this embodiment also provides a fiber laser, including the above-mentioned power detection device. For the fiber laser of this embodiment, it realizes the integrated design of red light access, power monitoring and pump beam combining, and improves the fiber laser manufacturing efficiency and product performance.

[0032] The above is based on the enlightenment of this utility model. Through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of ​​this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A red light introduction device, characterized in that: The invention comprises a first beam combining unit (1) and a second beam combining unit (2), wherein the first beam combining unit (1) comprises two first beam combining input ends (10) and a first beam combining output end (11), and the second beam combining unit (2) comprises an intermediate beam combining input end (21), at least one second beam combining input end (20) and a second beam combining output end (22); A first beam combining input end (10) is used to input red light, and the first beam combining output end (11) is connected to the intermediate beam combining input end (21).

2. A red light introduction device according to claim 1, characterized in that: The first beam combining unit (1) comprises a 2x1 beam combiner.

3. A red light introduction device according to claim 1, characterized in that: The second beam combining unit (2) comprises an (N+1)x1 beam combiner, and the intermediate optical fiber of the (N+1)x1 beam combiner is the intermediate beam combining input end (21).

4. A light introduction device according to claim 3, characterized in that: N is greater than or equal to 2 and is a positive integer.

5. The red light introduction device according to claim 1, characterized in that: The intermediate beam combining input end (21) is aligned with the first beam combining output end (11).

6. A red light introduction device according to claim 5, characterized in that: The intermediate beam combining input end (21) is aligned with the second beam combining output end (22).

7. The red light introduction device according to claim 1, characterized in that: It also comprises a pump (3), wherein the pump (3) is connected to the second beam combining input end (20) of the second beam combining unit (2).

8. The red light introduction device according to claim 1, characterized in that: It also includes a cladding light filter (4), and the second beam combining output end (22) is connected to the cladding light filter (4).

9. A power detection device, characterized in that: It comprises a red light introduction device as claimed in any one of claims 1 to 8, and also comprises a detector (5), wherein the detector (5) is connected to another first beam combining input end (10) of the first beam combining unit (1).

10. A fiber laser, characterized in that: Includes a power detection device as described in claim 9.

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