CN201222104Y

CN201222104Y - Optical fiber head

Info

Publication number: CN201222104Y
Application number: CNU2008201080732U
Authority: CN
Inventors: 毕勇; 房涛; 郑光
Original assignee: Beijing Phoebus Vision Optoelectronic Co ltd; Academy of Opto Electronics of CAS
Current assignee: Beijing Phoebus Vision Optoelectronic Co ltd; Academy of Opto Electronics of CAS
Priority date: 2008-05-23
Filing date: 2008-05-23
Publication date: 2009-04-15
Anticipated expiration: 2018-05-23

Abstract

The utility model discloses an optical fiber head, which is characterized in that the optical fiber head comprises a sleeve tube and a plurality of optical fibers fixed in the sleeve tube, wherein fixing materials among the plurality of optical fibers and fixing materials between the sleeve tube and the optical fibers are glass materials. Because of utilizing glass as a cementing agent, the optical fiber head structure overcomes shortages that the existing organic cementing agent is easy to burn under high temperature to damage the optical fiber head, guarantees the cementing agent hardness and the grinding quality at the same time, simultaneously, as the thermal expansion coefficient of the glass materials is similar to that of optical fiber materials, problems such as tackless and the like caused by expansion and contraction can be avoided, and the range of work temperature is expanded.

Description

Optical fiber head

Technical field

The utility model belongs to the optical fiber technology field, particularly a kind of optical fiber head that is suitable for the high power laser light transmission.

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 heat optical cement.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 hardness is not high enough, 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 utility model is to overcome the defective of using organic gel easily to cause optical fiber head to burn in the high-power laser system, thereby a kind of optical fiber head is provided.

The optical fiber head that the utility model provides comprises sleeve pipe and is fixed on multifiber in the described sleeve pipe, wherein, between the described multifiber and the immobilization material between described sleeve pipe and the described optical fiber be glass material.

In the above-mentioned optical fiber head, described glass preferably uses seal glass.

In the above-mentioned optical fiber head, the material preferred metal materials of described sleeve pipe, for example copper or stainless steel etc.

Because glass material is an inorganics, and it is high temperature resistant, optical fiber head structure therefore of the present utility model uses glass as bonding agent, guaranteeing bonding agent hardness, when guaranteeing Grinding Quality, also overcome the burning easily at high temperature of present organic bond, caused the defective of optical fiber head damage, thereby the resistance to elevated temperatures of whole optical fiber head greatly strengthened, and improved the stability and the security that are used for high power transmission.

Simultaneously, because the thermal expansivity and the fiber optic materials of glass material is approaching, can cause owing to expanding with heat and contract with cold and come unglued or problem such as crackle occurs, the scope of working temperature is further expanded.

Description of drawings

Below, describe embodiment of the present utility model 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 is the sectional view of the utility model optical fiber head structure;

Fig. 4 is the longitudinal sectional view of the utility model optical fiber head structure;

Fig. 5 makes the heating arrangement of optical fiber head and the stereographic map of vessel;

Fig. 6 is the heating arrangement among Fig. 5 and the cut-open view of vessel;

Fig. 7 makes the heating arrangement of optical fiber head and the cut-open view of vessel, has wherein put into the sleeve pipe of end sealing in the groove of vessel, has inserted the glass that is powdery in the sleeve pipe of end sealing;

Fig. 8 makes the heating arrangement of optical fiber head and the cut-open view of vessel, has wherein inserted fibre bundle in the sleeve pipe of end sealing, and glass melted by heat become liquid;

Fig. 9 is the structural representation that sleeve pipe, fibre bundle and the glass of the end sealing of taking out from vessel is fixed together;

Figure 10 is through the optical fiber head structure synoptic diagram after grinding and the polishing.

Embodiment

Fig. 3 and Fig. 4 show an embodiment of the utility model optical fiber head, this optical fiber head comprises sleeve pipe 2 and 12 fibre bundles that optical fiber 1 is formed, described fibre bundle is installed in the sleeve pipe 2, the light output end of fibre bundle aligns with an end of sleeve pipe 2, wherein, all bond together securely between the optical fiber 1 and between optical fiber 1 and the sleeve pipe 2 by glass 3.The optical fiber head of this structure uses glass to replace traditional organic gel, when high power laser transmits, even the more or surperficial dust etc. that is stained with of the light output end injustice, the cut that cause in optical fiber head treatment process defectiveness or the use, and produce scattered light thus and cause the very high situation of optical fiber head local temperature to occur, but because the heat resistance of glass is fine, even at high temperature, glass also only can soften and can not burn, and the optical fiber hair is given birth to burning and caused the phenomenon of damage when therefore having avoided long-time transmission high power laser.In addition, using the another one advantage of glass material is that the thermal expansivity and the optical fiber of glass are approaching, can not destroy bonding fastness owing to expanding with heat and contract with cold, and the situation of crackle also can not occur.

Those of ordinary skills are to be understood that, the radical of sleeve pipe inner fiber can be chosen according to actual needs, the quantity of optical fiber is just for the example explanation in the foregoing description, and it is unrestricted, the material preferred metal materials of sleeve pipe 2, for example copper or stainless steel etc., described glass is preferably the close material of linear expansion coefficient of linear expansion coefficient and optical fiber and makes.

Fig. 5-Figure 10 shows a kind of method for making of optical fiber head structure of the present utility model, may further comprise the steps:

1) on warm table 4, places vessel 5, as shown in Figure 5 and Figure 6, the internal diameter of these vessel 5 is approximately equal to the cover external diameter of pipe of waiting to make optical fiber head, select the copper sleeve 8 of end sealing for use, its blind end is inserted in the described vessel 5, the glass 6 of an amount of powdery is filled in the described copper sleeve 8, after an amount of glass 6 melted by heat with powdery described herein become liquid state, the glass that fibre bundle is in a liquid state after being inserted in the copper sleeve 8 can not overflow and be degree, best be chosen as liquid glass in right amount and just can not overflow, promptly just be full of copper sleeve 8 when inserting the glass that fibre bundle is in a liquid state later on.As shown in Figure 7, a kind of in the seal glass of the glass 6 that is powdery in the present embodiment, it is cryogenic glass powder, what adopt is that to make every effort to achieve the trade mark that glass scientific and technological development company limited produces be 0118 low-melting point sealing glass in the sky, and the inversion temperature of this cryogenic glass powder is 323 ℃, softening temperature is 390 ℃, and sealing temperature is 430 ℃-460 ℃.Preferably, the inside wall height of described vessel 5 is greater than the length of described copper sleeve 8, and like this, the inwall of vessel 5 can also carry out certain constraint to fibre bundle, makes better fibre bundle to be controlled in the manufacturing process;

2) starting warm table, the glass 6 of described powdery is heated to is fused into liquid state fully, is that cryogenic glass powder is an example with the material of the glass 6 of powdery, and heating-up temperature should be controlled at 460 ℃～500 ℃;

3) fibre bundle 7 is immersed in the liquid glass 6, make between each optical fiber and optical fiber and copper sleeve 8 between all be full of the glass 6 of liquid state, as shown in Figure 8; Control warm table 4 then and progressively reduce according to the Characteristics Control temperature of glass 6, promptly carry out annealing process, annealing process is can eliminate for the internal stress that glass 6 is produced in the process of cooling curing, improves the toughness of glass 6, reduces fragility.Simultaneously because the material of glass 6 is elected the linear expansion coefficient material close with optical fiber as, therefore in the process of annealing, be maintained fixed between glass 6 and all optical fiber, can not occur making the phenomenon of glass 6, can not occur making optical fiber be pressed from both sides evil idea or glass 6 yet by the phenomenon of squeeze crack because the holding force between glass 6 and the optical fiber constantly increases from coming off between fibre bundle owing to the space between glass 6 and the optical fiber increases.In order to achieve the above object, annealing and cooling procedure must be divided into the step of a plurality of coolings and insulation, wherein, 50-150 ℃ of every reduction temperature just is incubated 10-20 minute, to the last reduces to till the room temperature.Cryogenic glass powder for present embodiment, the annealing process that is adopted is specially: reduce temperature to 300 ℃, be incubated 10～20 minutes then, then cool to 200 ℃, be incubated 10～20 minutes again, cool to 100 ℃ then, then be incubated 10～20 minutes, at room temperature naturally cool to room temperature at last, above-mentioned annealing and cooling procedure are carried out in the air of normal pressure.

Annealed processing, the glass 6 in the copper sleeve 8 is transferred to solid-state by liquid state, fibre bundle 7 and copper sleeve 8 are fixed together;

4) fibre bundle 7 that will be fixed with copper sleeve 8 takes out, and as shown in Figure 9, along the dotted line transverse cuts, exposes inner fibre bundle light output end;

5) described light output end is ground and polishes, finally obtain optical fiber head structure shown in Figure 10.

Above-mentioned steps 3) in, because the prescription difference of each model powdered glass, the annealing process of taking is also different, because the glass of different formulations 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 cryogenic glass powder, annealing and cooling procedure are 50 ℃ of every reductions, just are incubated 10 minutes, till being cooled to room temperature; And In yet another embodiment, to above-mentioned same cryogenic glass powder, annealing and cooling procedure are 150 ℃ of every reductions, just are incubated 20 minutes, till being cooled to room temperature, can realize the purpose of eliminating glass internal stress, raising toughness, reducing fragility.

Certainly, above-mentioned method for making only is used for the example explanation, but not to restriction of the present utility model, for example, can also use the sleeve pipe of the described end sealing of anchor clamps clamping to heat, perhaps can directly the liquid glass that has melted be added in the described sleeve pipe, or the like.

It should be noted that embodiment in above each accompanying drawing at last only in order to optical fiber head structure of the present utility model and preparation method thereof to be described, but unrestricted.Although the utility model is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is carried out various combinations, revises or is equal to replacement, the spirit and scope that do not break away from technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1. an optical fiber head is characterized in that, comprise sleeve pipe and be fixed on multifiber in the described sleeve pipe, wherein, between the described multifiber and the immobilization material between described sleeve pipe and the described optical fiber be glass material.

2. the described optical fiber head of claim 1 is characterized in that, described glass is seal glass.

3. optical fiber head according to claim 1 is characterized in that, the material of described sleeve pipe is a metal material.

4. optical fiber head according to claim 3 is characterized in that, described metal material is copper or stainless steel.