CN210779472U - Optical fiber cladding light stripping structure with simple structure - Google Patents
Optical fiber cladding light stripping structure with simple structure Download PDFInfo
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- CN210779472U CN210779472U CN201921830656.0U CN201921830656U CN210779472U CN 210779472 U CN210779472 U CN 210779472U CN 201921830656 U CN201921830656 U CN 201921830656U CN 210779472 U CN210779472 U CN 210779472U
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- heat dissipation
- optical fiber
- sleeve pipe
- dissipation sleeve
- scattering
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Abstract
Simple structure's optic fibre covering light stripping structure relates to optical fiber device technical field, thereby it includes the surface through destroying the optic fibre covering and is in the rough scattering surface in surface that the surface formed, optic fibre covering light stripping structure still includes non-light tight heat dissipation sleeve pipe, the pore that link up around the heat dissipation sleeve pipe is equipped with, optic fibre runs through the pore is so that heat dissipation sleeve pipe box establishes in the scattering surface outside, the heat dissipation sleeve pipe with optic fibre fixed and with the scattering surface between have the gap, the heat dissipation sleeve pipe includes two at least splices, the heat dissipation sleeve pipe by two at least splices concatenation forms to can be in not cutting off establish heat dissipation sleeve pipe box in the scattering surface outside under the condition of optic fibre. The scattering surface with rough surface is formed, so that the total reflection condition of cladding light transmission is destroyed, the cladding light is refracted or scattered out of the cladding, the cladding light is stripped, and a medium (such as high-refractive-index glue) which is easy to be thermally damaged is not used on the scattering surface (an area which is easy to generate heat), so that the heat bearing capacity is greatly improved.
Description
Technical Field
The utility model relates to an optic fibre device technical field.
Background
In a high-power all-fiber laser, the cladding of the optical fiber inevitably contains residual pumping light, amplified spontaneous emission and signal light leaked due to non-ideal fusion, fiber bending and other factors, and the cladding light can deteriorate the beam quality of output laser light and even damage other optical fiber devices in a semiconductor pumping source and a laser system, thereby seriously affecting the stability of the laser. Therefore, how to reliably and efficiently strip the cladding light from the cladding is one of the key problems in developing high-power all-fiber lasers.
The cladding light stripper is a passive device for eliminating the cladding light in the optical fiber, and the basic working principle is to make the cladding light refract or scatter out of the cladding by destroying the total reflection condition of the cladding light transmission. The traditional cladding light stripper is characterized in that high-refractive-index glue is coated on the surface of a cladding of an optical fiber, so that the cladding is refracted or scattered out of the cladding, the burning point temperature of the glue is low, if the heat dissipation is poor, the risk of burning is caused, the stable work can be realized only under the cooling of a high-strength water-through heat sink, the heat dissipation problem needs to be fully considered during use, and the high-temperature tolerance of the high-refractive-index glue is poor, so that the power bearing capacity of the cladding light stripper with the structure is limited.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an optical fiber cladding light stripping structure, which has better high temperature resistance and can bear higher optical power.
In order to achieve the above object, the following technical solutions are proposed.
Optical fiber cladding light stripping structure includes thereby through destroying the surface of optical fiber cladding the rough surface's that the surface formed scattering surface, optical fiber cladding light stripping structure still includes non-light tight heat dissipation sleeve, the pore that link up around the heat dissipation sleeve was equipped with, optic fibre runs through the pore is so that heat dissipation sleeve pipe is established in the scattering surface outside, the heat dissipation sleeve pipe with optic fibre is fixed and have the gap between the scattering surface, the heat dissipation sleeve pipe includes two at least splices, the heat dissipation sleeve pipe by two at least splices splice forms, with can not cutting off establish heat dissipation sleeve pipe in the scattering surface outside under the condition of optic fibre.
The utility model discloses an optical fiber covering light stripping structure forms the rough surface's scattering surface through the mode that destroys the optical fiber covering surface to destroy covering optical transmission's total reflection condition, make covering light refraction or scattering go out the covering, realize the peeling off to covering light, do not use the medium (for example high refractive index glue) of easy thermal damage at the scattering surface (the region that easily generates heat), thereby improved the heat-resisting ability greatly, obtain better high temperature tolerance, thereby can bear higher optical power. The heat dissipation sleeve can keep the strength and the structural stability of the optical fiber in the area where the scattering surface is located, the scattering surface is also prevented from being damaged by external force, and the light-transmitting heat dissipation sleeve can enable light scattered or refracted from the cladding to be emitted and conduct away heat, so that the heat dissipation effect is achieved. The heat dissipation sleeve is formed by splicing at least two splicing pieces, and can be assembled and sleeved on the outer side of the scattering surface under the condition of not cutting off the optical fiber, so that the heat dissipation sleeve can be manufactured on site, and a system where the optical fiber is located can be conveniently modified. Simple structure, low process requirement and low manufacturing cost.
The heat dissipation sleeve is characterized in that the number of the splicing pieces is two, at least one splicing piece is provided with a groove extending in the front-back direction, and after the two splicing pieces are spliced to form the heat dissipation sleeve, the grooves are spliced to form the duct. Two splicers are spliced to form the heat dissipation sleeve pipe, simple structure, and the equipment is convenient.
Wherein, the pore canal is a cylinder, an oval column, a triangular column or a square column. The cross section of the pore canal of the cylinder is circular, the cross section of the scattering surface is approximately circular, and the matching shapes of the two are used for enabling the cladding light refracted or scattered from the cladding to easily penetrate through the heat dissipation component; the cylindrical light is convenient to fix due to the pore channel of the rectangular cylinder; the oval cylinder is convenient to process, and the triangular cylinder is convenient to fix the optical fiber.
Wherein the heat dissipation sleeve is made of sapphire. Sapphire's heat conductivity is better, can dispel the heat fast, improves the utility model discloses a covering light stripper's thermal diffusivity. The high-efficiency power stripping can be realized, and simultaneously, the high cladding power stripping can be realized.
The heat dissipation sleeve is fixedly bonded with the region outside the scattering surface of the optical fiber through glue, the splicing pieces are fixedly bonded through the glue, and the refractive index of the glue is 1.5-1.65. Avoid coating the lower glue of ignition point at the scattering surface to avoid reducing the utility model discloses a high temperature resistance of covering light stripper.
Wherein, the structures of all splicing pieces are the same. The structure is very simple, the production is convenient, and the production cost is reduced.
The scattering surface is formed by continuously splicing a plurality of scattering areas which are distributed side by side in the front-back direction, the light guide direction of the optical fiber is from front to back, and the surface of each scattering area is rougher than the surface of the scattering area adjacent to the scattering area in the front. So can realize stripping cladding light more evenly, gradiently to avoid local heat accumulation, realize that high cladding light strips efficiency, let cladding light strip at the scattering surface more evenly, the dispersion is generated heat the point, avoids forming heat at the scattering surface front end and gathers, does benefit to the heat dissipation, can further improve high temperature tolerance, improves and to bear the weight of the ground light power.
Further, the scattering region has three segments in total.
The heat dissipation sleeve is characterized by further comprising a black metal shell, and the metal shell is sleeved outside the heat dissipation sleeve and fixed with the heat dissipation sleeve. The black performance of absorbing light is better, converts illumination into the heat, and the thermal diffusivity of metal is better.
Further, the metal shell is provided with a heat radiation water channel for radiating heat in a water cooling mode. The heat dissipation of the metal shell is accelerated in a water cooling mode, the bearable optical power can be further improved, and the fiber laser device can be applied to a fiber laser system with higher power.
Drawings
FIG. 1 is a schematic longitudinal sectional view of an optical fiber cladding light stripping structure according to the present invention;
FIG. 2 is a schematic structural diagram of the scattering surface of FIG. 1;
FIG. 3 is a schematic view of an embodiment of section A-A of FIG. 1;
FIG. 4 is a schematic structural view of another embodiment of section A-A in FIG. 1.
The reference numerals include:
optical fiber 1, core 11, cladding 12, scattering surface 121;
a heat dissipation sleeve 21, a splice 211, a metal shell 22;
and (3) glue.
Detailed Description
The present invention will be described in detail with reference to the following specific examples.
As shown in fig. 1, the optical fiber 1 includes a core and a cladding 12, and the optical fiber cladding light stripping structure of the present embodiment includes a rough-surface scattering surface 121 and a light-transmissive heat dissipation sleeve 21, and preferably, the heat dissipation sleeve 21 is made of sapphire, which has good thermal conductivity and can dissipate heat quickly. The scattering surface 121 is obtained by breaking the outer surface of the cladding 12, and in the present embodiment, it is preferable to obtain the scattering surface 121 by etching the outer surface of the cladding 12 with hydrofluoric acid. The heat dissipation sleeve 21 is provided with a through hole (defined in the text as the direction from front to back, in fig. 1 and 2, the direction from bottom to top), the optical fiber 1 penetrates through the hole, and the scattering surface 121 is located in the hole, in other words, the heat dissipation sleeve 21 is sleeved outside the scattering surface 121, the heat dissipation sleeve 21 is fixed with the optical fiber 1, and a gap is left between the scattering surface 121 and the heat dissipation sleeve 21. With reference to fig. 1 and 3, the heat dissipation sleeve 21 is formed by splicing two splices 211, each splice 211 has a semi-cylindrical groove extending in the front-back direction, the structures of the splices 211 are the same, and after the two splices 211 are spliced, the semi-cylindrical grooves of the two splices 211 are spliced to form the cylindrical duct. With reference to fig. 1 and 4, in another embodiment, the heat dissipation sleeve 21 is formed by splicing two splicing members 211, each splicing member 211 is provided with a rectangular cylindrical groove extending along the front-back direction, the structures of the splicing members 211 are the same, and after the two splicing members 211 are spliced, the rectangular cylindrical grooves of the two splicing members 211 are spliced to form the square cylindrical duct. In other embodiments, the duct may be an elliptical cylinder, a triangular cylinder. After the splices 211 are spliced, the joints between the splices extend in the front-back direction and penetrate the heat dissipation sleeve 21 in the front-back direction, that is, the joints extend along the direction of the optical fiber 1, so that the heat dissipation sleeve 21 can be sleeved outside the scattering surface 121 without cutting off the optical fiber 1. The seam can extend straight or curved. In other embodiments, the heat dissipation sleeve 21 may be integrally formed, and a thin groove penetrating from front to back is formed to communicate with the hole for inserting the optical fiber 1 into the hole without cutting the optical fiber 1, and the thin groove may extend linearly or curvilinearly in the front-back direction.
The two splicing members 211 with the same structure have the advantages of simple structure, convenient assembly and low production cost. In other embodiments, the number of splice members 211 can also be three or more, as the case may be. The shapes of the splices 211 may also be different, and at least one splice 211 is provided with a groove extending in the front-to-back direction to ensure that the duct is formed after the splices 211 are spliced.
As shown in fig. 1, the heat dissipation sleeve 21 is bonded and fixed with the region outside the scattering surface 121 of the optical fiber 1 through the glue 3, so as to avoid coating the glue 3 with lower burning point on the scattering surface 121, thereby avoiding reducing the high temperature tolerance of the cladding light stripper. Referring to fig. 3 and 4, the respective splicing members 211 are adhesively fixed by glue 3, preferably, the seams between the splicing members 211 at the positions of the two ends of the heat dissipation sleeve 21 are adhesively fixed by glue 3, and in other embodiments, all seams between the respective splicing members 211 may be glued to be adhesively fixed. The glue 3 is a glue with a high refractive index, and the refractive index is 1.5-1.65.
Further, as shown in fig. 1, 3, and 4, the cladding light stripper may further include a black metal shell 22, and the metal shell 22 is sleeved outside the heat dissipation sleeve 21 and fixed to the heat dissipation sleeve 21. The black performance of absorbing light is better, converts illumination into the heat, and the thermal diffusivity of metal is better. Further, the metal housing 22 is provided with a heat radiation water passage (not shown) for radiating heat by water cooling. The heat dissipation of the metal shell 22 is accelerated by the water cooling method, the bearable optical power can be further improved, and the fiber laser device can be applied to a fiber laser system with higher power.
As shown in fig. 2, the scattering surface 121 is formed by continuously splicing three scattering regions (regions a, b, and c) distributed side by side in the front-back direction, the light guiding direction of the optical fiber 1 is from front to back, the surface of each scattering region is rougher than the surface of the scattering region adjacent to the scattering region in the front, and in fig. 2, the light guiding direction of the optical fiber 1 is from bottom to top, that is, the region b of the scattering surface 121 is rougher than the region a, and the region c is rougher than the region b. Therefore, the cladding light can be more uniformly stripped on the scattering surface 121, the heating points are dispersed, heat accumulation is avoided, heat dissipation is facilitated, high-temperature tolerance can be further improved, and the ground light power capable of being borne is improved. In other embodiments, the roughness of the light-guiding region may be divided into 2 or more regions with different roughness, and if the technical conditions allow, it is better to make the roughness gradually increase along the light-guiding direction. In this embodiment, different concentrations of hydrofluoric acid are used to etch the cladding 12 to obtain scattering regions of different roughness levels.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. Simple structure's optic fibre covering light stripping structure, its characterized in that includes thereby through destroying the surface of optic fibre covering the rough surface scattering surface that the surface formed, optic fibre covering light stripping structure still includes non-light tight heat dissipation sleeve pipe, the pore that link up around the heat dissipation sleeve pipe is equipped with, optic fibre runs through the pore is so that heat dissipation sleeve pipe box establishes in the scattering surface outside, the heat dissipation sleeve pipe with optic fibre is fixed and have the gap between the scattering surface, and the heat dissipation sleeve pipe includes two at least splices, the heat dissipation sleeve pipe by two at least splices concatenation forms, with can not cutting off establish the heat dissipation sleeve pipe in the scattering surface outside under the condition of optic fibre.
2. The optical fiber cladding light stripping structure according to claim 1, wherein there are two of said splices, at least one of said splices having a groove extending in a front-to-back direction, and wherein after said splices are spliced to form a heat sink sleeve, said grooves are spliced to form said duct.
3. The optical fiber cladding light stripping structure according to claim 1, wherein the via is a cylinder, an elliptical cylinder, a triangular cylinder, or a square cylinder.
4. The optical fiber cladding light stripping structure of claim 1 wherein the heat dissipating sleeve is made of sapphire.
5. The optical fiber cladding light stripping structure according to claim 1, wherein the heat sink sleeve is adhesively secured to the region of the optical fiber outside the scattering surface by glue, and each splice is adhesively secured by glue having a refractive index of 1.5-1.65.
6. The optical fiber cladding light stripping structure according to claim 1, wherein the structure of each splice is the same.
7. The optical fiber cladding light stripping structure according to claim 1 wherein the scattering surface is formed by continuously splicing a plurality of scattering regions arranged side by side in a front-to-back direction, and the light guiding direction of the optical fiber is from front to back, and the surface of each scattering region is rougher than the surface of the scattering region adjacent to the scattering region in the front direction.
8. The optical fiber cladding light stripping structure according to claim 7 wherein the scattering region has three segments in total.
9. The optical fiber cladding light stripping structure according to claim 1 further comprising a ferrous metal sheath disposed around and secured to the outside of the heat sink sleeve.
10. The optical fiber cladding light stripping structure according to claim 9, wherein the metal housing is provided with a heat sink channel for dissipating heat by water cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921830656.0U CN210779472U (en) | 2019-10-28 | 2019-10-28 | Optical fiber cladding light stripping structure with simple structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921830656.0U CN210779472U (en) | 2019-10-28 | 2019-10-28 | Optical fiber cladding light stripping structure with simple structure |
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| Publication Number | Publication Date |
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| CN210779472U true CN210779472U (en) | 2020-06-16 |
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| CN201921830656.0U Expired - Fee Related CN210779472U (en) | 2019-10-28 | 2019-10-28 | Optical fiber cladding light stripping structure with simple structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112038876A (en) * | 2020-11-04 | 2020-12-04 | 中国工程物理研究院激光聚变研究中心 | Heat abstractor and fiber laser |
-
2019
- 2019-10-28 CN CN201921830656.0U patent/CN210779472U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112038876A (en) * | 2020-11-04 | 2020-12-04 | 中国工程物理研究院激光聚变研究中心 | Heat abstractor and fiber laser |
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Granted publication date: 20200616 Termination date: 20211028 |