Optical fiber collimator for stripping glass tube waveguide light
By forming a light filtering structure on the surface of the glass tube, the problem of temperature rise at the tail of the adhesive caused by the light from the glass tube waveguide was solved, and a fiber collimator with higher operating power and stability was achieved.
Patent Information
- Application Number
- CN202423197078.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-24
AI Technical Summary
In high-power fiber collimators, the temperature rise of the tail adhesive caused by the waveguide light in the glass tube leads to performance degradation and decreased stability.
A light filtering structure is formed on the inner or outer surface of the glass tube to disrupt the total internal reflection condition, allowing the reflected light to pass through the glass tube and avoiding the temperature rise of the tail adhesive caused by the waveguide light in the glass tube.
The operating power of the fiber collimator was increased, the temperature of the tail adhesive was reduced, and the stability and performance were enhanced.
Smart Images
Figure CN223679398U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of optical fiber collimator, especially to a kind of optical fiber collimator of stripping glass tube waveguide light. BACKGROUND
[0002] High-power optical fiber collimator is widely used in industrial laser field, and too high working temperature is an important reason to limit the working power of optical fiber collimator, so reducing the additional temperature rise source of collimator is the key to improve the working power of collimator.
[0003] In practical application, since the outer surface of collimator glass tube is often air (refractive index is 1), the glass tube is often borosilicate glass (refractive index is 1.5), and the refractive index of fused quartz is 1.45, there is a total reflection angle, and the mismatched light of collimator coupling is transmitted along the meridian plane of collimator fiber, and after reaching the total reflection condition of collimator glass tube, it can be continuously totally reflected in collimator glass tube, and the reflection light path is as shown in Figure 1 and Figure 3 It becomes collimator glass tube waveguide light. And this part of glass tube waveguide light will be guided to the collimator tail cementing place, causing the additional temperature rise of tail cement, and further causing the aging of tail cement, the performance degradation, and finally leading to the performance and stability of collimator. SUMMARY
[0004] The utility model aims at providing a kind of optical fiber collimator of stripping glass tube waveguide light.
[0005] In order to realize the utility model purposes, the utility model provides a kind of optical fiber collimator of stripping glass tube waveguide light, including capillary, optical fiber, lens and glass tube, capillary is provided with capillary hole along axial direction, cladding of optical fiber is inserted into capillary hole, output end of optical fiber is close to first axial end of capillary, second axial end of capillary is fixedly connected with cladding of optical fiber by glue;Glass tube is provided with mounting hole along axial direction, lens and capillary are installed in mounting hole with clearance fit, outer peripheral wall of capillary is adjacent to inner peripheral wall of glass tube, and output end of optical fiber is towards lens;Outer peripheral wall of glass tube is provided with light filtering structure, and light filtering structure is located in the radial outer periphery of capillary.
[0006] Further scheme is that light filtering structure is circumferentially surrounded, and light filtering structure extends along the axial direction of glass tube.
[0007] Further scheme is that light filtering structure is close to the axial middle part of capillary and / or second axial end of capillary.
[0008] Further scheme is that second axial end of capillary is located outside mounting hole.
[0009] Further, the light filtering structure can be formed by a roughening process.
[0010] Further, the light filtering structure can be formed by coating a high refractive index material.
[0011] Further, the output end of the optical fiber is provided with a slanted grating, which is close to the first axial end of the capillary tube.
[0012] The beneficial effects of the present application are that, in addition to the light that is not coupled into the optical fiber due to partial coupling mismatch, the Raman light generated in the laser due to nonlinear effects is transmitted from the right side to the left side of the optical fiber, and when it is transmitted to the slanted grating, the Raman light is stripped to the capillary tube and transmitted to the glass tube. Therefore, by forming the light filtering structure on the inner or outer surface of the glass tube, the total reflection condition of the collimator can be destroyed, the reflected light can be transmitted outward from the light filtering structure, and the additional temperature rise of the collimator tail glue caused by the glass tube waveguide light can be avoided. Therefore, the collimator of the present application can support higher working power. In addition, the filtering structure is surrounded and extends along the axial direction, and is arranged in the middle or the second axial end, which improves the stability of the filtering and locates the glued position outside the glass tube, thereby reducing the illumination probability of the reflected light. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 is a structural schematic view of the first embodiment of the optical fiber collimator of the present application without arranging the light filtering structure.
[0014] Figure 2 is a structural schematic view of the first embodiment of the optical fiber collimator of the present application.
[0015] Figure 3 is a structural schematic view of the second embodiment of the optical fiber collimator of the present application without arranging the light filtering structure.
[0016] Figure 4 is a structural schematic view of the second embodiment of the optical fiber collimator of the present application.
[0017] The present application will be further described below in conjunction with the drawings and embodiments. DETAILED DESCRIPTION
[0018] First embodiment of the optical fiber collimator:
[0019] Referring to Figure 2The optical fiber collimator comprises a capillary tube 23, an optical fiber 1, a lens 21 and a glass tube 22. The capillary tube 23 is provided with a capillary hole 233 along an axial direction. The cladding of the optical fiber 1 is inserted into the capillary hole 233. The output end 11 of the optical fiber 1 is close to the first axial end 231 of the capillary tube 23. The second axial end 232 of the capillary tube 23 is fixedly connected with the cladding of the optical fiber 1 by glue.
[0020] The glass tube 22 is provided with a mounting hole 221 along an axial direction. The lens 21 and the capillary tube 23 are gap-fittedly mounted in the mounting hole 221. The outer peripheral wall of the capillary tube 23 is adjacent to the inner peripheral wall of the glass tube 22. The output end 11 of the optical fiber 1 is directed towards the lens 21. The output end 11 of the optical fiber 1 is provided with an inclined grating 12. The inclined grating 12 is close to the first axial end 231 of the capillary tube 23. The second axial end 232 of the capillary tube 23 is located outside the mounting hole 221. The tail glue 24 of the cladding of the optical fiber 1 is also located outside the mounting hole 221.
[0021] The outer peripheral wall of the glass tube 22 is provided with a light filtering structure 222. The light filtering structure 222 is formed by a roughening process. Alternatively, the light filtering structure 222 can be formed by coating a high-refractive glue. The light filtering structure 222 is located at the radial outer periphery of the capillary tube 23. The light filtering structure 222 is circumferentially arranged. The light filtering structure 222 extends along the axial direction of the glass tube 22. The light filtering structure 222 is close to the axial middle part of the capillary tube 23. The light filtering structure 222 can also be close to the second axial end 232 of the capillary tube 23.
[0022] Since the refractive index of the air outside the glass tube 22 is 1, the glass tube is generally made of borosilicate glass material, the refractive index of which is 1.5, and the glass tube has a total reflection angle. The unabsorbed cladding pump light L0 is transmitted from the right to the left of the optical fiber. When the unabsorbed cladding pump light is transmitted to the inclined grating 12, most of the unabsorbed cladding pump light is stripped to the capillary tube and transmitted to the glass tube.
[0023] Referring to Figure 1 Before the glass tube 22 is roughened, the transmitted cladding pump light satisfies the total reflection condition of the glass tube. The above-mentioned part of the glass tube waveguide light L1 is reflected by the glass tube and transmitted from the glass tube to the capillary tube 23 and irradiated to the tail glue 24, causing the temperature of the tail glue 24 to rise.
[0024] Referring to Figure 2 After the light filtering structure 222 is formed on the glass tube 22, the above-mentioned part of the glass tube waveguide light L2 cannot be totally reflected by the glass tube 22 and will be transmitted to the outside of the collimator. Therefore, the temperature of the tail glue can be effectively reduced.
[0025] Second embodiment of the optical fiber collimator:
[0026] Referring to Figure 4On the basis of the first embodiment and the same principle, the output end 11 of the optical fiber 1 can also not be provided with an inclined grating, which can also achieve the purpose of the present application. As shown in Figure 3 The partially coupled mismatched light fails to be coupled into the optical fiber 1, but is transmitted to the capillary 23 and then to the glass tube 22. Since the refractive index of the air outside the glass tube is 1 and the glass tube is made of borosilicate glass material with a refractive index of 1.5, there is a total reflection angle. Before the glass tube forms the light filtering structure 22, the light that is partially coupled mismatched and transmitted to the glass tube satisfies the total reflection condition, and then the above-mentioned partially coupled mismatched light L3 is reflected by the glass tube 22 and transmitted from the glass tube 22 to the capillary 23 and irradiated to the tail glue 24, causing the temperature of the tail glue 24 to rise.
[0027] Referring to Figure 4 After the glass tube 22 forms the light filtering structure 22, the above-mentioned partially coupled mismatched light L4 cannot be totally reflected by the glass tube 22, but will be transmitted to the outside of the collimator, thus effectively reducing the temperature of the tail glue.
[0028] Of course, the above-mentioned embodiments are only preferred embodiments of the present application, and in specific applications there can be more changes, for example, in addition to being formed on the outer peripheral wall of the glass tube, the light filtering structure can also be formed on the inner peripheral wall of the glass tube, which can also filter the coupled mismatched light and the cladding pump light.
[0029] As can be seen from the above, by forming a light filtering structure on the inner surface or the outer surface of the glass tube, the total reflection condition of the collimator can be destroyed, the reflected light can be transmitted outward from the light filtering structure, and the additional temperature rise of the collimator tail glue caused by the glass tube waveguide light can be avoided, so that the collimator of the present application can support higher working power.
Claims
1. A fiber collimator for stripping a glass tube waveguide light, characterized by, The glass tube is provided with a mounting hole along the axial direction, the lens and the capillary tube are installed in the mounting hole in a clearance fit, the outer peripheral wall of the capillary tube is adjacent to the inner peripheral wall of the glass tube, and the output end of the optical fiber faces the lens. The outer peripheral wall and / or the inner peripheral wall of the glass tube is provided with a light filtering structure, and the light filtering structure is located at the radial outer periphery of the capillary tube.
2. The optical fiber collimator according to claim 1, wherein: The light filtering structure is circumferentially surrounded, and the light filtering structure extends along the axial direction of the glass tube.
3. The optical fiber collimator according to claim 2, wherein: The light filtering structure is close to the axial middle part of the capillary tube and / or the second axial end of the capillary tube.
4. The optical fiber collimator according to claim 1, wherein: The second axial end of the capillary tube is located outside the mounting hole.
5. The optical fiber collimator according to claim 1, wherein: The light filtering structure is formed by a texturing process.
6. The optical fiber collimator according to claim 1, wherein: The light filtering structure is formed by coating a high-refractive glue.
7. The optical fiber collimator according to any one of claims 1 to 6, wherein: The output end of the optical fiber is provided with an inclined grating, and the inclined grating is close to the first axial end of the capillary tube.