Tool for testing cladding pumping absorption coefficient of large-core-diameter double-cladding active optical fiber
By designing an automatic winding tool for large-core double-clad active fibers, the problem of stress influence when artificially coiled fibers is solved, and the accuracy and repeatability of the test are improved.
Patent Information
- Application Number
- CN202420597991.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-03-26
AI Technical Summary
In the prior art, when testing large-core double-clad active fibers, tension is required for artificially coiled fibers, resulting in stress affecting the test data, and the stresses suffered by different people when wound, affecting the accuracy and repeatability of the test results.
A tooling is designed, including a bracket, a roller and a rod body. The outer wall of the roller is equipped with a spiral coiled groove. The rod body is flexible and rotates synchronously with the roller. It automatically wraps the optical fiber through the roller to avoid artificial tension.
The fiber is stress-free coiled during testing, which improves the accuracy and repeatability of the cladding pump absorption coefficient test.
Smart Images
Figure CN222635752U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical fiber testing, in particular to a tool for testing the cladding pump absorption coefficient of a large-core-diameter double-cladding active optical fiber. Background Art
[0002] In today's industrial production, fiber lasers occupy a very important position with their unique advantages. They have good beam quality, high light output power, excellent electro-optical conversion efficiency, compact structure and small size, and good heat dissipation performance. They are widely used in the fields of laser cutting and welding.
[0003] Among various fiber lasers, large core double-clad active fiber is the core part. Its structure consists of the core, cladding (generally made into special shapes, such as octagon, D-type, etc. to avoid the generation of spiral light and improve the utilization rate of pump light), inner coating, and outer coating from the inside to the outside. Since the refractive index of the inner coating is lower than that of the cladding, it is called a double-cladding structure. The design of the double-cladding structure greatly increases the effective coupling area of the pump light, improves the injection efficiency of the pump light, and significantly improves the output power of the fiber laser. The absorption capacity of large core double-clad active fiber for pump light is usually characterized by the cladding pump absorption coefficient.
[0004] During the cladding pump test of large-core double-clad active optical fiber, we need to cut a certain length (4-10 meters) of optical fiber for testing. During the test, the optical fiber is placed randomly and the optical fiber shape cannot be kept fixed. At the same time, since the large-core double-clad active optical fiber is an optical fiber with a large mode field diameter, it is easy to produce macrobending loss and microbending loss due to bending during the test. This requires us to try our best to maintain the stability of the optical fiber shape during the test to avoid the large-core double-clad active optical fiber being affected by macrobending loss and microbending loss during the test. The current method is to manually wind the optical fiber under test on a cylinder of a certain diameter, fix it and then test it, but this method has two problems: first, manual winding of the optical fiber requires the use of tension, which causes the test data of the optical fiber on the cylinder to be affected by stress; second, when different people wind the optical fiber, the tension used by each person is inconsistent, resulting in different stresses on the optical fiber after it is wound on the cylinder, which in turn causes differences in test data, ultimately resulting in poor accuracy and repeatability of the test results. Based on this, providing a tool for testing the cladding pump absorption coefficient of large-core double-clad active optical fiber has become an urgent problem to be solved in the industry. Utility Model Content
[0005] The utility model provides a tool for testing the cladding pump absorption coefficient of a large-core double-clad active optical fiber, which is used to solve the defect in the prior art that the large-core double-clad active optical fiber generates stress due to the action of tension when winding.
[0006] The utility model provides a tool for testing the cladding pump absorption coefficient of a large-core double-cladding active optical fiber, comprising: a bracket; a roller, which is arranged on the bracket and can rotate, and the outer wall of the roller is provided with a spirally wound groove, and the groove is used to accommodate the active optical fiber; a rod body, which is arranged on the bracket and can abut against the active optical fiber when the active optical fiber is embedded in the groove.
[0007] According to the tooling for testing the cladding pump absorption coefficient of a large-core double-cladding active optical fiber provided by the utility model, the rod body is a flexible rod body.
[0008] According to the tooling for testing the cladding pump absorption coefficient of a large-core double-cladding active optical fiber provided by the utility model, the depth and width of each groove are equal to the diameter of the active optical fiber.
[0009] According to the tooling for testing the cladding pump absorption coefficient of a large-core double-cladding active optical fiber provided by the utility model, the rod body rotates synchronously with the roller, and the rotation directions of the rod body and the roller are opposite.
[0010] According to the utility model, a tool for testing the cladding pump absorption coefficient of a large-core double-clad active optical fiber also includes: a first rotating shaft, which is rotatably connected to the bracket, and the roller is sleeved on the outside of the first rotating shaft; a second rotating shaft, which is rotatably connected to the bracket, and the rod body is connected to the second rotating shaft, and the second rotating shaft is arranged parallel to the first rotating shaft and rotates synchronously.
[0011] According to the utility model, a tool for testing the cladding pump absorption coefficient of a large-core double-cladding active optical fiber also includes: a first gear connected to the first rotating shaft; a second gear connected to the second rotating shaft, and the second gear meshes with the first gear.
[0012] According to the utility model, a tool for testing the cladding pump absorption coefficient of a large-core double-clad active optical fiber also includes a fixing mechanism, which is arranged on the roller and adjacent to the groove, and is used to fix one end of the active optical fiber.
[0013] According to a tooling for testing the cladding pump absorption coefficient of a large-core double-clad active optical fiber provided by the utility model, the fixing mechanism comprises: a bottom plate, arranged on the outer wall of the drum; a convex block, arranged at the first end of the bottom plate, and a slot is arranged on the surface of the convex block opposite to the bottom plate; a clamping member, comprising a first clamping portion, a second clamping portion and a hook connected in sequence, the first clamping portion being vertically arranged with the bottom plate and connected to the second end of the bottom plate, the second clamping portion being rotatably connected to the first clamping portion, the hook being able to be clamped with the slot, and when the hook is in clamping engagement with the slot, the active optical fiber is clamped between the bottom plate and the second clamping portion.
[0014] According to the tooling for testing the cladding pump absorption coefficient of a large-core double-cladding active optical fiber provided by the utility model, the cross-sectional shape of the roller is circular, square or elliptical.
[0015] According to the utility model, a tool for testing the cladding pump absorption coefficient of a large-core double-cladding active optical fiber also includes a handle, which is connected to the first rotating shaft.
[0016] The utility model provides a tool for testing the cladding pump absorption coefficient of a large-core double-clad active optical fiber. By arranging a spirally wound groove on a drum and arranging a rod body on one side of the drum, the active optical fiber can be automatically wound in the groove of the drum when the drum rotates. The active optical fibers in each groove have a uniform tightness during winding, thus avoiding stress on the active optical fiber caused by tension when winding the active optical fiber, and improving the accuracy and repeatability of the active optical fiber cladding pump absorption test. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 It is a structural schematic diagram of a tooling provided by the utility model for testing the cladding pump absorption coefficient of a large core diameter double-cladding active optical fiber;
[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of the rod body shown in FIG.
[0020] Figure 3 yes Figure 1 A schematic diagram of the structure of the fixing mechanism shown in FIG.
[0021] Reference numerals:
[0022] 10: bracket; 11: first rotating shaft; 12: second rotating shaft; 20: roller; 21: groove; 30: rod body; 40: fixing mechanism; 41: bottom plate; 42: protrusion; 43: slot; 44: first clamping part; 45: second clamping part; 46: third clamping part; 47: fourth clamping part; 50: handle; 60: first gear; 70: second gear; 471: first body; 472: second body. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0024] The features of the terms "first" and "second" in the specification and claims of the utility model may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "plurality" is two or more.
[0025] Combine the following Figure 1-Figure 3 The utility model describes a tool for testing the cladding pump absorption coefficient of a large-core double-cladding active optical fiber.
[0026] like Figure 1 As shown, in an embodiment of the utility model, the tooling for testing the cladding pump absorption coefficient of a large core double-clad active optical fiber comprises: a bracket 10, a roller 20 and a rod 30. The roller 20 is arranged on the bracket 10, and the roller 20 can rotate. The outer wall of the roller 20 is provided with a spirally wound groove 21, and the groove 21 is used to accommodate the active optical fiber. The rod 30 is arranged on the bracket 10, and the length of the rod 30 is greater than the width of all the grooves 21. The rod 30 can abut against the active optical fiber when the active optical fiber is embedded in the groove.
[0027] Specifically, the outer wall of the drum 20 is provided with a spirally wound groove 21, and the winding method of the groove 21 is consistent with the winding method of the active optical fiber. Each groove 21 includes a pair of groove walls arranged opposite to each other and a groove bottom located between the pair of groove walls. When testing the active optical fiber cladding pump absorption coefficient, one end of the active optical fiber is fixed to the starting end of the groove 21, and the drum 20 is rotated, so that the active optical fiber can be embedded in each groove 21 and then automatically wound on the outside of the drum 20. During the rotation of the drum 20, the rod body 30 abuts against the active optical fiber, so that the two opposite surfaces of the active optical fiber abut against the groove bottom of the groove 21 and the rod body 30 respectively, ensuring that the active optical fiber is uniformly tight when winding along the groove 21. Further, in this embodiment, the rod body 30 and the active optical fiber are only in abutment relationship, and the rod body 30 does not apply pressure to the active optical fiber, so that the active optical fiber is not subjected to tension when it is wound on the drum 20. After the active optical fiber is coiled on the drum 20 , the pump absorption coefficient of the active optical fiber cladding can be tested.
[0028] Furthermore, in this embodiment, the length of the rod body 30 is slightly larger than the width of all the grooves 21 on the drum 20, so that the active optical fiber can be completely embedded in the groove 21 without manual pulling when winding, thereby avoiding stress on the active optical fiber during pulling and affecting the test results.
[0029] The grooves 21 are arranged in a spiral shape at intervals of a certain width, and the intervals can be freely set. The length of the grooves 21 is determined by the pump absorption coefficient of the active optical fiber. Generally, the larger the cladding pump absorption coefficient, the shorter the length of the active optical fiber required for a single test; the smaller the cladding pump absorption coefficient, the longer the length of the active optical fiber required for a single test.
[0030] The tooling for testing the cladding pump absorption coefficient of a large-core double-clad active optical fiber provided by the embodiment of the utility model, by arranging a spirally wound groove on a drum and arranging a rod body on one side of the drum, can automatically wind the active optical fiber into the groove of the drum when the drum rotates, and the active optical fibers in each groove are of uniform tightness during winding, thereby avoiding stress on the active optical fiber caused by tension when winding the active optical fiber, and improving the accuracy and repeatability of the active optical fiber cladding pump absorption test.
[0031] It can be understood that: in the embodiment of the present invention, the width and depth of the groove 21 can be designed according to the diameter of the active optical fiber to be tested, so that the roller 20 can wind active optical fibers of different diameters.
[0032] Furthermore, in an embodiment of the utility model, the width and depth of each groove are equal to the diameter of the active optical fiber to be tested, so that when the active optical fiber is wound on the drum 20, the surface of each active optical fiber is flush with the outer wall of the drum 20, and the rod body 30 limits the active optical fiber without exerting pressure on the active optical fiber.
[0033] Furthermore, in the embodiment of the present invention, the rod body 30 is a flexible rod body to avoid pressure generated when the rod body 30 abuts against the active optical fiber.
[0034] In the embodiment of the utility model, the rod body 30 rotates synchronously with the roller 20 , and the rotation directions of the rod body 30 and the roller 20 are opposite, so that the rod body 30 can avoid friction on the active optical fiber when the roller 20 rotates.
[0035] like Figure 1 As shown, in an embodiment of the utility model, the tooling for testing the cladding pump absorption coefficient of a large core double-clad active optical fiber further includes: a first rotating shaft 11 and a second rotating shaft 12. The first rotating shaft 11 is rotatably connected to the bracket 10, and the roller 20 is sleeved on the outside of the first rotating shaft 11. The second rotating shaft 12 is also rotatably connected to the bracket 10, and the rod body 30 is connected to the second rotating shaft 12. The second rotating shaft 12 is arranged parallel to the first rotating shaft 11 and rotates synchronously.
[0036] Specifically, the first rotating shaft 11 and the second rotating shaft 12 rotate synchronously, thereby driving the drum 20 and the rod body 30 to rotate synchronously, so as to ensure that the rod body 30 and the drum 20 maintain a consistent linear speed when rotating.
[0037] Furthermore, if Figure 2 As shown, the tooling for testing the cladding pump absorption coefficient of a large core double-clad active optical fiber also includes: a first gear 60 and a second gear 70. The first gear 60 is connected to the first rotating shaft 11, the second gear 70 is connected to the second rotating shaft 12, and the second gear 70 is meshed with the first gear 60.
[0038] Specifically, when the first rotating shaft 11 rotates, the drum 20 and the first gear 60 are driven to rotate synchronously, and the first gear 60 and the second gear 70 are driven to drive the rod body 30 and the drum 20 to rotate synchronously, and the rotation directions of the drum 20 and the rod body 30 are opposite.
[0039] like Figure 1 As shown, the tooling for testing the cladding pump absorption coefficient of a large-core double-clad active optical fiber also includes a handle 50 , which is connected to the first rotating shaft 11 . Shaking the handle 50 can drive the roller 20 and the rod body 30 to rotate synchronously.
[0040] The tooling for testing the cladding pump absorption coefficient of a large-core double-clad active optical fiber provided by the embodiment of the utility model can make the drum and the rod body rotate synchronously and in opposite directions by setting the first rotating shaft, the second rotating shaft, the first gear and the second gear, thereby avoiding the friction of the rod body on the active optical fiber during the rotation of the drum. When the active optical fiber is coiled, there is no need to pull the active optical fiber, thereby realizing stress-free coiling of the active optical fiber. At the same time, when the fiber is withdrawn, the shape of the active optical fiber can be kept stable to avoid loosening.
[0041] like Figure 1 As shown, in the embodiment of the present invention, according to different application scenarios of the active optical fiber, the shape of the roller 20 can be various, for example, its cross-sectional shape can be circular, square or elliptical.
[0042] like Figure 1 As shown, in the embodiment of the utility model, the tooling for testing the cladding pump absorption coefficient of a large core double-clad active optical fiber further includes a fixing mechanism 40, which is disposed on the roller 20 and adjacent to the groove 21. The fixing mechanism 40 is used to fix one end of the active optical fiber. Specifically, the fixing mechanism 40 is used to fix the first end of the active optical fiber to prevent the active optical fiber from spreading when coiling.
[0043] like Figure 3 As shown, in the embodiment of the utility model, the fixing mechanism 40 includes: a bottom plate 41, a protrusion 42 and a clamping member. The bottom plate 41 is arranged on the outer wall of the drum 20, the protrusion 42 is arranged at the first end of the bottom plate 41, and a clamping groove 43 is arranged on the surface of the protrusion 42 opposite to the bottom plate 41. The clamping member includes a first clamping portion 44, a second clamping portion 45 and a hook connected in sequence. The first clamping portion 44 is arranged vertically with the bottom plate 41 and connected to the second end of the bottom plate 41, the second clamping portion 45 is rotatably connected to the first clamping portion 44, and the hook can be clamped with the clamping groove 43.
[0044] The hook includes: a third clamping portion 46 and a fourth clamping portion 47. The third clamping portion 46 is vertically arranged and connected to the second clamping portion 45, and the fourth clamping portion 47 includes a first body 471 and a second body 472 connected, the angle between the first body 471 and the second body 472 is an obtuse angle, the first body 471 is elastically connected to the third clamping portion 46, and the angle between the first body 471 and the third clamping portion 46 is an acute angle, wherein, when the hook is clamped with the slot 43, the first body 471 and the third clamping portion 46 are located in the slot 43.
[0045] Specifically, the second clamping part 45 of the clamping member is rotatably connected with the first clamping part 44, so that the second clamping part 45 can drive the hook to move toward or away from the slot 43. When the hook enters the slot 43, the angle between the first body 471 of the fourth clamping part 47 and the third clamping part 46 is reduced, and the first body 471 and the third clamping part 46 enter the slot 43. After entering, the angle between the first body 471 and the third clamping part 46 is restored to the initial angle, so that the second body 472 of the fourth clamping part 47 abuts against the surface of the slot 43, and the active optical fiber is fixed between the bottom plate 41 and the second clamping part 45. When the active optical fiber needs to be released, that is, when the hook is separated from the slot 43, the second body 472 is pulled to reduce the angle between the first body 471 and the third clamping part 46, so that the first body 471 and the third clamping part 46 are separated from the slot 43.
[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A tool for testing the cladding pump absorption coefficient of a large core diameter double-clad active optical fiber, characterized in that: include: Bracket; A roller, arranged on the bracket, the roller can rotate, and an outer wall of the roller is provided with a spirally wound groove, the groove is used to accommodate the active optical fiber; A rod body is arranged on the bracket, the length of the rod body is greater than the width of all the grooves, and the rod body can abut against the active optical fiber when the active optical fiber is embedded in the groove.
2. The tooling for testing the cladding pump absorption coefficient of a large core diameter double-clad active optical fiber according to claim 1, characterized in that: The rod body is a flexible rod body.
3. The tooling for testing the cladding pump absorption coefficient of a large core diameter double-clad active optical fiber according to claim 1, characterized in that: The depth and width of each of the grooves are equal to the diameter of the active optical fiber.
4. The tooling for testing the cladding pump absorption coefficient of a large core diameter double-clad active optical fiber according to claim 1, characterized in that: The rod body rotates synchronously with the roller, and the rotation directions of the rod body and the roller are opposite.
5. The tooling for testing the cladding pump absorption coefficient of a large core diameter double-clad active optical fiber according to claim 4, characterized in that: Also includes: A first rotating shaft is rotatably connected to the bracket, and the roller is sleeved on the outside of the first rotating shaft; The second rotating shaft is rotatably connected to the bracket, the rod body is connected to the second rotating shaft, and the second rotating shaft is arranged parallel to the first rotating shaft and rotates synchronously.
6. The tooling for testing the cladding pump absorption coefficient of a large core diameter double-clad active optical fiber according to claim 5, characterized in that: Also includes: A first gear connected to the first rotating shaft; The second gear is connected to the second rotating shaft, and the second gear is meshed with the first gear.
7. The tooling for testing the cladding pump absorption coefficient of a large core diameter double-clad active optical fiber according to claim 1, characterized in that: It also includes a fixing mechanism, which is arranged on the roller and adjacent to the groove, and is used to fix one end of the active optical fiber.
8. The tooling for testing the cladding pump absorption coefficient of a large core diameter double-clad active optical fiber according to claim 7, characterized in that: The fixing mechanism comprises: A bottom plate, arranged on the outer wall of the drum; A convex block is arranged at the first end of the bottom plate, and a surface of the convex block opposite to the bottom plate is provided with a slot; The clamping member includes a first clamping portion, a second clamping portion and a hook connected in sequence, wherein the first clamping portion is vertically arranged with the base plate and connected with the second end of the base plate, the second clamping portion is rotatably connected with the first clamping portion, and the hook can be clamped with the slot. When the hook is in clamping engagement with the slot, the active optical fiber is clamped between the base plate and the second clamping portion.
9. The tooling for testing the cladding pump absorption coefficient of a large core diameter double-clad active optical fiber according to claim 1, characterized in that: The cross-sectional shape of the drum is circular, square or elliptical.
10. The tooling for testing the cladding pump absorption coefficient of a large core diameter double-clad active optical fiber according to claim 6, characterized in that: It also includes a handle, which is connected to the first rotating shaft.