It is a kind of with chalcogenide glass sandwich layer/tellurate glass coating layer multicore composite material lightFibre and preparation method thereofTechnical field
The present invention relates to special optical fiber fields, and in particular to a kind of multicore of chalcogenide glass sandwich layer/tellurate glass coating layerComposite material fiber and preparation method thereof.
Technical background
Compared with general single material optical fiber, composite material fiber has core packet refringence and numeric aperture values adjustable extentThe big and various features such as dispersion and non-linear value easy-regulating, and it can also integrate the advantage of two kinds of composite materials respectively.CauseThis, using infrared glass in tellurate, sulphur system and fluoride etc. as the composite fiber of core packet composition material mid-infrared laser, inThe fields such as infrared super continuous spectrums, parametric oscillation and sensing have important application prospect.
In recent years, composite fiber has obtained developing quickly.2009, Chaudhari et al. devised one kind with boronThe composite material fiber that silicate glass is covering, chalcogenide glass is core, and obtain by theoretical calculation the zero dispersion point of the optical fiberIt has been adjusted near infrared band.2015, Japanese university, Toyota reported one kind using tellurate glass as sandwich layer, phosphate glassGlass is the composite material fiber of covering, realizes the regulation of dispersion and non-linear aspect.But, the composite material light of above-mentioned reportFibre is limited only to traditional step change type structure, so they are restricted in terms of optical transmission mode and mould field regulation.And it is moreCore fibre has special structure, so that it has very big advantage at above-mentioned two aspect.But current multi-core optical fiber is due to bigPart uses airport, so that its structure is more fragile, this greatly limits the applications of the optical fiber.
Summary of the invention
In view of the above-mentioned problems, being answered the present invention provides a kind of with chalcogenide glass sandwich layer/tellurate glass coating layer multicoreCondensation material optical fiber makes full use of chalcogenide glass and the respective high non-linearity of tellurate glass and low phonon energy and between the twoEach function of big refringence, Lai Shixian composite material fiber and multi-core optical fiber it is integrated.
Technical solution of the present invention:
The covering of the multicore composite material fiber is a kind of multicomponent tellurate glass, and concrete component is (88-x) TeO2-6Bi2O3-xLi2O-6ZnO, wherein x takes 6~14；Sandwich layer is a kind of chalcogenide glass, concrete component are as follows: (40-y) Ge-ySb-60Se, wherein y takes 6~12.
Based on above scheme, the present invention has also further made following optimization:
The string diameter of the multicore composite material fiber is 125~300 μm.
Multiple holes on covering section corresponding to sandwich layer are divided into multiple concentric arrangement.
Multiple holes on covering section corresponding to sandwich layer are integrally in regular polygon.
A kind of preparation method of above-mentioned multicore composite material fiber, includes the following steps:
1) raw material of covering is mixed, the mixing of the raw material of sandwich layer, tellurate glass is prepared respectively using melt quenching methodGlass prefabricated rods and chalcogenide glass prefabricated rods；
2) the chalcogenide glass prefabricated rods are placed in the infrared wire-drawer-tower of soft glass, chalcogenide glass is obtained by hot-drawn preparation methodSpillikin；Punching processing is carried out to the tellurate glass prefabricated rods, obtains porous tellurate prefabricated rods；
3) the chalcogenide glass spillikin is placed in the hollow hole of porous tellurate glass prefabricated rods, is obtained with pipe stickThe multicore composite material fiber prefabricated rods of structure；
4) the multicore composite material fiber prefabricated rods are placed in the infrared wire-drawer-tower of soft glass, are prepared by hot-drawn preparation methodObtain that there is chalcogenide glass sandwich layer/tellurate glass coating layer multicore composite material fiber.
Inert gas is all made of during step 2) and step 4) hot-drawn system to be protected.
In step 2), hot draw temperature is 400~440 DEG C, the chalcogenide glass prefabricated rods spillikin size range drawnFor 0.5~1mm.
In step 2), porous tellurate glass prefabricated rods are prepared using mechanical punching method, aperture is 0.5~1mm.
In step 4), hot draw temperature is 400~440 DEG C, and the optical fiber string diameter drawn is 125~300 μm.
It include hot pulling process twice in above-mentioned preparation method, hot pulling process is for by chalcogenide glass prefabricated rods for the first timeIt is drawn into spillikin, second of hot pulling process is that multicore composite material fiber is prepared using rod in tube method.Due to chalcogenide glassEasily be oxidized under the high temperature conditions, thus be all made of during above-mentioned hot-drawn twice the inert gases such as argon gas, nitrogen intoRow protection.In addition, during second of hot-drawn system, since prefabricated rods are pipe stick structures, need between retention bar pipe there are pressure difference, intoAnd the fiber cores packet fitting for ensuring to be prepared is close.
Beneficial effects of the present invention:
1. the present invention is by dexterously having chosen the hot propertys property phase such as viscosity, thermal expansion coefficient and glass transition temperatureMutually multicore composite wood is successfully prepared respectively as covering and core material in the middle infrared glass of matched two kinds different systemsExpect optical fiber, thus realize in each function of infrared composite material optical fiber and multi-core optical fiber it is integrated.Its mid-infrared laser,There is very important application prospect in super continuous spectrums and integreted phontonics field.
2. preparation process of the present invention is simple, strong operability, success rate is high.
Detailed description of the invention
Fig. 1 is multicore composite material fiber prefabricated rods manufacturing process schematic diagram in the present invention；
Fig. 2 is the end view of multicore composite material fiber of the invention.
Drawing reference numeral explanation:
The porous tellurate glass prefabricated rods of 1-；2- chalcogenide glass spillikin；3- covering；4- sandwich layer.
Specific embodiment
Three embodiments are given below, and the present invention will be described in detail.
The covering of three embodiments and the specific formula of sandwich layer see the table below 1.
Table 1
The preparation process of embodiment 1 is as follows:
1. tellurate glass prefabricated rods and chalcogenide glass prefabricated rods are prepared respectively using melt quenching method；Wherein, telluriumSilicate glass preform diameter is 20mm, and chalcogenide glass preform diameter is 12mm；
2. the above-mentioned chalcogenide glass prefabricated rods being prepared are placed in the infrared wire-drawer-tower of soft glass, pass through hot-drawn preparation methodObtain the chalcogenide glass spillikin that outer diameter is 0.5mm；Wherein hot draw temperature is 400 DEG C, protective gas N2, gas flow is0.5L/min；
3. carrying out punching processing, aperture to tellurate glass prefabricated rods obtained in above-mentioned steps 1 by mechanical punching methodFor 0.5mm (keeping plus tolerance), porous tellurate prefabricated rods are obtained；
4. the chalcogenide glass spillikin that step 2 obtains is placed in porous tellurate glass prefabricated rods obtained in step 3In hollow hole (as shown in Figure 1), the multicore composite material fiber prefabricated rods of pipe stick structure are obtained；
5. multicore composite material fiber prefabricated rods obtained in step 4 are placed in the infrared wire-drawer-tower of soft glass, pass through heatDrawing is prepared that (end face structure is shown in figure with chalcogenide glass sandwich layer/tellurate glass coating layer multicore composite material fiber2), string diameter is 125 μm；Wherein, hot draw temperature is 400 DEG C, and protective gas protective gas is N2, gas flow 0.5L/Min, and keeping pressure difference inside and outside pipe stick is -5KPa.
The preparation process of embodiment 2 is as follows:
1. tellurate glass prefabricated rods and chalcogenide glass prefabricated rods are prepared respectively using melt quenching method；Wherein, telluriumSilicate glass preform diameter is 20mm, and chalcogenide glass preform diameter is 12mm；
2. the above-mentioned chalcogenide glass prefabricated rods being prepared are placed in the infrared wire-drawer-tower of soft glass, pass through hot-drawn preparation methodObtain the chalcogenide glass spillikin that outer diameter is 0.8mm；Wherein hot draw temperature is 420 DEG C, protective gas Ar, and gas flow is1L/min；
3. carrying out punching processing, aperture to tellurate glass prefabricated rods obtained in above-mentioned steps 1 by mechanical punching methodFor 0.8mm (keeping plus tolerance), porous tellurate prefabricated rods are obtained；
4. the chalcogenide glass spillikin that step 2 obtains is placed in porous tellurate glass prefabricated rods obtained in step 3In hollow hole (as shown in Figure 1), the multicore composite material fiber prefabricated rods of pipe stick structure are obtained；
5. multicore composite material fiber prefabricated rods obtained in step 4 are placed in the infrared wire-drawer-tower of soft glass, pass through heatDrawing is prepared that (end face structure is shown in figure with chalcogenide glass sandwich layer/tellurate glass coating layer multicore composite material fiber2), string diameter is 200 μm；Wherein, hot draw temperature is 420 DEG C, and protective gas protective gas is Ar, gas flow 1L/Min, and keeping pressure difference inside and outside pipe stick is -5KPa.
The preparation process of embodiment 3 is as follows:
1. tellurate glass prefabricated rods and chalcogenide glass prefabricated rods are prepared respectively using traditional melt quenching method；ItsIn, tellurate glass preform diameter is 20mm, and chalcogenide glass preform diameter is 12mm；
2. the above-mentioned chalcogenide glass prefabricated rods being prepared are placed in the infrared wire-drawer-tower of soft glass, pass through hot-drawn preparation methodObtain the chalcogenide glass spillikin that outer diameter is 1.0mm；Wherein hot draw temperature is 440 DEG C, protective gas He, and gas flow is1.5L/min；
3. carrying out punching processing, aperture to tellurate glass prefabricated rods obtained in above-mentioned steps 1 by mechanical punching methodFor 1.0mm (keeping plus tolerance), porous tellurate prefabricated rods are obtained.
4. the chalcogenide glass spillikin that step 2 obtains is placed in porous tellurate glass prefabricated rods obtained in step 3In hollow hole (as shown in Figure 1), the multicore composite material fiber prefabricated rods of pipe stick structure are obtained；
5. multicore composite material fiber prefabricated rods obtained in step 4 are placed in the infrared wire-drawer-tower of soft glass, pass through heatDrawing is prepared that (end face structure is shown in figure with chalcogenide glass sandwich layer/tellurate glass coating layer multicore composite material fiber2), string diameter is 300 μm；Wherein, hot draw temperature is 440 DEG C, protective gas He, gas flow 1.5L/min, and is protectedHolding pressure difference inside and outside pipe stick is -5KPa.
Process made above has successfully obtained multicore composite material fiber, achieves expected effect through experiment test.It is logicalThe pressure difference inside and outside strictly control heating furnace thermal field uniformity, protective gas air-flow size and pipe stick, can be further assured that systemIt is standby to obtain the multicore composite material fiber of high quality (core packet bias is small, surface is smooth, circularity is good).