CN101587208A - Optical fiber head and manufacturing method thereof - Google Patents
Optical fiber head and manufacturing method thereof Download PDFInfo
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- CN101587208A CN101587208A CNA2008101123963A CN200810112396A CN101587208A CN 101587208 A CN101587208 A CN 101587208A CN A2008101123963 A CNA2008101123963 A CN A2008101123963A CN 200810112396 A CN200810112396 A CN 200810112396A CN 101587208 A CN101587208 A CN 101587208A
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- optical fiber
- inner sleeve
- glass inner
- fiber head
- outer tube
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Abstract
The invention discloses an optical fiber head, which is characterized by comprising an outer sleeve, at least one glass inner sleeve and optical fiber bundles arranged in the glass inner sleeve, wherein the glass inner sleeve is arranged in the outer sleeve to form the optical fiber head; no filler exists between the glass inner sleeve of the optical fiber head and optical fibers and among the optical fibers, and the softening temperature of glass is far higher than the combustion temperature of optical adhesive so as to avoid the phenomenon that the filler is combusted caused by severely accumulated heat and the optical fiber head is burnt out; in addition, the optical fiber head adopts a metal outer sleeve to increase the impact resistance, and simultaneously, the metal outer sleeve can also be used as an adapter for connecting the optical fiber head and other components.
Description
Technical field
The invention belongs to the optical fiber technology field, particularly a kind of optical fiber head that is suitable for the high power laser light transmission and preparation method thereof.
Background technology
At present, in fields such as medical treatment, materials processing, laser displayes, require the Output optical power of optical fiber head very high, traditional optical fiber head structure comprises fixed sleeving and simple optical fiber, fixed sleeving helps optical fiber head structure is fixed on other devices, and simple optical fiber is inserted in the fixed sleeving and uses glue (normally 353ND) to be bonded and fixed in the fixed sleeving on every side.PROCESS FOR TREATMENT such as optical fiber head generally grinds, polishing.Cause fiber end face the phenomenon that burr etc. influences flatness to occur if grind inadequately meticulous meeting, perhaps since in the use fiber end face adhered to dust or cut appears in end face, all can cause the generation of scattering phenomenon, scattered light can add hot glue.When the smaller power Laser Transmission, the optical fiber head of this structure can also be used, if but be used for high power laser light transmission, then the heat build-up phenomenon will be very serious, and the optical cement pollution fiber end face that will volatilize influences optical fiber quality.Therefore if will utilize simple optical fiber output high-power laser, can only adopt no adhesive process, promptly produce a groove, expose in groove near making the end of simple optical fiber in the end of optical fiber head, but this structure is higher to the rigidity requirement of optical fiber, otherwise the end of optical fiber will be crooked.The output power of single laser instrument is also very limited in addition, this has also greatly limited the power of transmission laser in the connected simple optical fiber, can certainly adopt a plurality of laser instruments to export laser to open space, and with lens with these laser focusings, and be coupled in the simple optical fiber, though this method has remedied the limited problem of single laser output power, increased the difficulty that system installs and debugs.Optical fiber in the prior art in the optical fiber head structure of realization high power laser transmission adopts bundling optical fiber more, wherein, more common structure is made into the internal diameter of fixed sleeving P2 and can holds multifiber P1 as depicted in figs. 1 and 2, and the longitudinal length of fixed sleeving P2 can be decided according to the actual requirements.Calculate the quantity of needs optical fiber P1 according to the needs of through-put power, these optical fiber P1 is arranged in forms fibre bundle together, apply the optical cement P3 of certain-length at the leading portion of fibre bundle, be inserted into then among the fixed sleeving P2, in general, the length that covered of optical cement P3 is as long as approximate the length of fixed sleeving P2 greatly.Because the power density of the fiber end face of conduction and high power laser is very high usually, if the light output end injustice that causes in optical fiber head treatment process defectiveness or the use, more or the surperficial dust etc. that is stained with of cut, the capital causes the optical fiber head local temperature very high because of producing scattered light, therefore, the accuracy requirement that this optical fiber head grinds and polishes is very high, if use common glue, because the glue that hardness is not high enough and common and the linear expansion coefficient of optical fiber differ bigger, in process of lapping, can cause and peel off, form rough hole, do not reach accuracy requirement, therefore, people often use the higher organic gel of the hardness optical fiber that bonds, 353ND for example, but the thermal conductivity of these organic gel and thermotolerance are all very poor usually, and therefore in the coupling of high power laser optical fiber, the optical fiber head local temperature is often very high, and heat can not in time conduct, the composition of employed organic gel is an organism, the easy firing that is heated, so finally cause the organic gel burning and optical fiber head is burnt.
Summary of the invention
Therefore, task of the present invention is that to overcome the existing fiber head thermo-labile, the defective of burning easily when hot operation, thus a kind of optical fiber head of new structure is provided.
Another task of the present invention provides a kind of method for making of optical fiber head.
On the one hand, a kind of optical fiber head provided by the invention comprises outer tube, at least one glass inner sleeve and is installed in multifiber in the described glass inner sleeve that described glass inner sleeve is installed in the described outer tube, forms optical fiber head.
In the above-mentioned optical fiber head, the material preferred boric acid glass of described glass inner sleeve.
In the above-mentioned optical fiber head, the material preferable alloy of described outer tube, for example copper or stainless steel etc.
On the other hand, the invention provides a kind of method of making optical fiber head, may further comprise the steps:
A). fibre bundle is inserted in the glass inner sleeve;
B). heat described glass inner sleeve, its internal diameter is shunk, clamp the fibre bundle that is positioned at inside;
C). described glass inner sleeve is carried out annealing in process;
D). along laterally cutting of described glass inner sleeve, expose the light output end of internal optical fiber bundle, carry out milled processed then;
E). described glass inner sleeve packed in the outer tube and fixing, thereby obtain optical fiber head.
In the said method, described glass material preferred boric acid glass.
In the said method, the material preferable alloy of described outer tube, for example copper or stainless steel.
In the said method, the heating-up temperature of described step b) is 700 ℃-800 ℃.
In the said method, the described annealing process of described step c) preferably is divided into the step of a plurality of coolings and insulation, and wherein, 50-150 ℃ of every reduction temperature just is incubated 10-20 minute, to the last reduces to till the room temperature.For example:
The glass inner sleeve that at first will be inserted with optical fiber is cooled to 600 ℃, keeps 10-20 minute;
100 ℃ of every then declines just kept 10-20 minute under this temperature, continued to descend again, and until after keeping 100-20 minute under 100 ℃, placed natural cooling under the room temperature.
Optical fiber head of the present invention has following beneficial effect:
1, there is not filling material between glass inner sleeve and the optical fiber, and there is not filling material between the optical fiber yet, and the softening temperature of glass is higher than the temperature of combustion of optical cement far away, and this has just been avoided heat because of piling up the generation that seriously causes the filling material burning and burn out the situation of optical fiber head;
2, the shock resistance of independent glass inner sleeve is very poor, so the present invention adopts metal jacket pipe, to increase the shock resistance of optical fiber head, metal jacket pipe can also be served as optical fiber head is connected usefulness with other element adapter simultaneously.
Description of drawings
Below, describe embodiments of the invention in conjunction with the accompanying drawings in detail, wherein:
Fig. 1 is the sectional view of optical fiber head structure of the prior art;
Fig. 2 is the longitudinal sectional view of optical fiber head structure of the prior art;
Fig. 3 A is the optical fiber head structure of one embodiment of the present of invention;
Fig. 3 B is the optical fiber head structure of an alternative embodiment of the invention;
Fig. 4 is the sectional view of optical fiber head structure shown in Fig. 3 A;
Fig. 5 makes the glass inner sleeve before heating in the optical fiber head process of the present invention and has just inserted its interior fibre bundle;
Fig. 6 makes glass inner sleeve after the heating in the process of optical fiber head of the present invention and fixing within it fibre bundle.
Embodiment
Fig. 3 A and Fig. 4 illustrate a kind of longitudinal sectional view and cross-sectional figure of optical fiber head structure respectively, as we can see from the figure, optical fiber head in the present embodiment comprises outer tube 3, glass inner sleeve 2, and be arranged on fibre bundle 1 in the glass inner sleeve 2, this fibre bundle 1 is closely rearranged by 14 optical fiber, in each optical fiber space each other without any filling material, 14 optical fiber that glass inner sleeve 2 will be provided with in it are strapped in together tightly, fibre bundle 1 is securely fixed in the glass inner sleeve 2, and the outer wall of glass inner sleeve 2 closely contacts with the inwall of outer tube 3 and fixes.Wherein, the end of outer tube 3 both can with the end face (Fig. 3 A) in same plane of glass inner sleeve 2, the end face that also can make the end face of outer tube 3 and glass inner sleeve 2 according to actual needs is not in same plane, for example glass inner sleeve 2 is stretched out one section (Fig. 3 B) from outer tube 3, like this when guaranteeing fixing between glass inner sleeve 2 and the outer tube 3, reduce the length of outer tube 3 again, thereby saved material, reduced production cost.
Owing to do not have filling material between glass inner sleeve 2 in the optical fiber head of the present invention and the fibre bundle 1, and also do not have filling material between the optical fiber, this has just been avoided heat seriously to cause the filling material burning and burn out optical fiber head because of piling up; In addition, outer tube 3 can increase the shock resistance of optical fiber head, because the shock resistance of independent glass inner sleeve 2 is very poor, outer tube 3 can also serve as optical fiber head is connected usefulness with other element adapter simultaneously.Therefore the general preferred metal materials of material of outer tube 3, for example copper or stainless steel etc., the material of glass inner sleeve 2 are selected the comparatively approaching material of expansion coefficient of linear expansion coefficient and the optical fiber of forming fibre bundle 1, for example borate glass.
Certainly, those skilled in the art are to be understood that, the quantity of the optical fiber that comprises in the length of the length of outer tube 3 and internal diameter, glass inner sleeve 2 and internal diameter and the glass inner sleeve 2 all can be adjusted and be changed according to actual needs, and the arrangement method of the optical fiber of glass inner sleeve 2 inside is not limited only to a kind of mode shown in Fig. 4.In addition, can also many glass inner sleeve 2 be installed at outer tube 3 internal fixation, and all be provided with optical fiber or fibre bundle in every glass inner sleeve 2.
The method for making of above-mentioned optical fiber head structure may further comprise the steps,
1) fibre bundle 1 that 14 optical fiber are formed is inserted in the glass inner sleeve 2, as shown in Figure 5, the internal diameter of described glass inner sleeve 2 should be slightly larger than the external diameter of described fibre bundle 1, so that the insertion of fibre bundle 1, the glass that glass inner sleeve 2 is used is made by the comparatively approaching material of the linear expansion coefficient and the expansion coefficient of the optical fiber of forming fibre bundle 1, for example borate glass;
2) glass inner sleeve 2 being heated to the softening transform that is heated and producing shrinkage phenomenon, and till the grip optical fibers bundle 1, is that borate glass is an example with the material of glass inner sleeve 2, and heating makes the temperature of glass inner sleeve 2 reach 700 ℃-800 ℃.Because the resistance to elevated temperatures of optical fiber is better, therefore deformation takes place in optical fiber hardly in the process of this heating.And glass inner sleeve 2 is along with the rising of temperature, glass inner sleeve 2 is radially inwardly shunk, clamp its inner fibre bundle, thereby further reduced the space between the optical fiber, simultaneously, the longitudinal length of glass inner sleeve 2 also can increase, if the end (being the right-hand member of glass inner sleeve 2 among Fig. 6) of glass inner sleeve 2 surpasses the output terminal of fibre bundle in the process of heating, then the described terminal part of this glass inner sleeve 2 will be out of shape, and the output terminal of internal optical fiber bundle 1 covered, form shape shown in Figure 6;
3) described glass inner sleeve 2 and inner fibre bundle 1 are carried out annealing in process, annealing process is decided according to the material of concrete glass inner sleeve 2, annealing process assurance glass inner sleeve 2 internal stress in the process that temperature reduces is slowly eliminated, simultaneously because the approaching material of glass inner sleeve 2 selection linear expansion coefficients and optical fiber forms, therefore glass inner sleeve 2 can remain the grip optical fibers bundle in annealing process, can not occur the two being separated, can not occur making fibre bundle be pressed from both sides evil idea or glass inner sleeve 2 yet by squeeze crack because of the holding force between glass inner sleeve 2 and the fibre bundle 1 constantly increases because of the space between glass inner sleeve 2 and the fibre bundle 1 increases.In order to achieve the above object, the present invention will anneal and be divided into the step of a plurality of coolings that replace and insulation with cooling procedure, and wherein, 50-150 ℃ of every reduction temperature just is incubated 10-20 minute, to the last reduces to till the room temperature.Material with glass inner sleeve 2 is that borate glass is an example, and annealing is carried out under normal pressure in air, and process is specially: keep 600 ℃ heating-up temperature 10 to 20 minutes; Descend then 100 ℃ at every turn, and after this temperature keeps 10 to 20 minutes, continue to descend, up to after keeping 10 to 20 minutes under 100 ℃, at room temperature natural cooling is finished annealing in process;
4) along dotted line shown in Figure 6 described glass inner sleeve 2 and fibre bundle 1 are carried out transverse cuts, make the light output end of internal optical fiber bundle 1 all expose out, glass inner sleeve 2 and inner fibre bundle 1 that cutting is finished grind and polishing together.
5) will be inserted in the outer tube 3 through the glass inner sleeve 2 after grinding and polishing, blended rubber is fixing with outer tube 3 with glass inner sleeve 2, because no longer be that optical fiber is fixed this moment, therefore used glue no longer only limits to organic gel, but can use various common glue, various heat-resistant adhesives etc. for example are so the optical fiber head structure of this structure has not only reduced cost, and improved the thermotolerance of optical fiber head, even but on being used for operate as normal still under the situation of hectowatt laser output.
Above-mentioned steps 3) in, because employed glass material difference, the annealing process of taking is also different, because different glass internal stress in the process of cooling is also different, this is understandable to those of ordinary skills.For example, in another embodiment, to same borate glass, annealing process is 50 ℃ of every reductions, just is incubated 10 minutes, till being cooled to room temperature; And In yet another embodiment, to above-mentioned same borate glass, annealing process is 150 ℃ of every reductions, just is incubated 20 minutes, till being cooled to room temperature, can realize the purpose of eliminating glass internal stress, raising toughness, reducing fragility.
Above-mentioned steps 5) in,, can fix single or many glass inner sleeve 2 in the outer tube 3, the optical fiber of the some that all is fixedly clamped in each glass inner sleeve 2 according to the needs of different operating positions.
It should be noted that embodiment in above each accompanying drawing at last only in order to optical fiber head structure of the present invention and preparation method thereof to be described, but unrestricted.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is carried out various combinations, revises or is equal to replacement, the spirit and scope that do not break away from technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. an optical fiber head is characterized in that, described optical fiber head comprises outer tube, at least one glass inner sleeve and be installed in fibre bundle in the described glass inner sleeve that described glass inner sleeve is installed in the described outer tube, forms optical fiber head.
2. optical fiber head according to claim 1 is characterized in that, the expansion coefficient of the material of described glass inner sleeve is identical substantially with the expansion coefficient of described fiber optic materials.
3. optical fiber head according to claim 1 is characterized in that, the material of described glass inner sleeve is a borate glass.
4. optical fiber head according to claim 1 is characterized in that, the material of described outer tube is a metal, and described metal is copper or stainless steel.
5. method of making optical fiber head may further comprise the steps:
A). fibre bundle is inserted in the glass inner sleeve;
B). heat described glass inner sleeve, its internal diameter is shunk, clamp the fibre bundle that is positioned at inside;
C). described glass inner sleeve is carried out annealing in process;
D). along laterally cutting of described glass inner sleeve, expose the light output end of internal optical fiber bundle, carry out milled processed then;
E). described glass inner sleeve packed in the outer tube and fixing, thereby obtain optical fiber head.
6. method according to claim 5 is characterized in that, described glass material is a borate glass.
7. method according to claim 5 is characterized in that, the material of described outer tube is a metal, and described metal is copper or stainless steel.
8. method according to claim 5 is characterized in that, the heating-up temperature of described step b) is 700 ℃-800 ℃.
9. method according to claim 5 is characterized in that the described annealing process of described step c) is divided into the step of a plurality of coolings and insulation, and wherein, 50-150 ℃ of every reduction temperature just is incubated 10-20 minute, to the last reduces to till the room temperature.
10. method according to claim 5 is characterized in that, the annealing process of described step c) may further comprise the steps:
The glass inner sleeve that at first will be inserted with fibre bundle is cooled to 600 ℃, keeps 10-20 minute;
100 ℃ of every then declines just kept 10-20 minute under this temperature, continued to reduce temperature again, until after keeping 10-20 minute under 100 ℃, were placed on natural cooling under the room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101123963A CN101587208B (en) | 2008-05-23 | 2008-05-23 | Optical fiber head and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101123963A CN101587208B (en) | 2008-05-23 | 2008-05-23 | Optical fiber head and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101587208A true CN101587208A (en) | 2009-11-25 |
| CN101587208B CN101587208B (en) | 2011-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101123963A Expired - Fee Related CN101587208B (en) | 2008-05-23 | 2008-05-23 | Optical fiber head and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291830A (en) * | 2016-04-06 | 2017-01-04 | 上海瑞柯恩激光技术有限公司 | Fibre-optical splice |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3620368A1 (en) * | 1986-06-18 | 1987-12-23 | Schott Glaswerke | FIBER OPTICAL LIGHT GUIDE, HIGH-TEMPERATURE-RESISTANT IN ITS FACE AREA, AND METHOD FOR THE PRODUCTION THEREOF |
| CN1181364C (en) * | 2003-04-03 | 2004-12-22 | 上海交通大学 | Plastic fiber coupler and its making process |
| CA2597205A1 (en) * | 2006-08-29 | 2008-02-29 | Sumitomo Electric Industries, Ltd. | Fiber bundle and light-source equipment |
| CN201222105Y (en) * | 2008-05-23 | 2009-04-15 | 北京中视中科光电技术有限公司 | Optical fiber head |
-
2008
- 2008-05-23 CN CN2008101123963A patent/CN101587208B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291830A (en) * | 2016-04-06 | 2017-01-04 | 上海瑞柯恩激光技术有限公司 | Fibre-optical splice |
| CN106291830B (en) * | 2016-04-06 | 2019-01-04 | 上海瑞柯恩激光技术有限公司 | Fibre-optical splice |
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| Publication number | Publication date |
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| CN101587208B (en) | 2011-12-07 |
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Granted publication date: 20111207 Termination date: 20140523 |