CN117310871B - Application of chalcogenide glass fiber monofilament in preparation of long-wave infrared optical fiber image transmission beam - Google Patents
Application of chalcogenide glass fiber monofilament in preparation of long-wave infrared optical fiber image transmission beam Download PDFInfo
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- CN117310871B CN117310871B CN202311087633.6A CN202311087633A CN117310871B CN 117310871 B CN117310871 B CN 117310871B CN 202311087633 A CN202311087633 A CN 202311087633A CN 117310871 B CN117310871 B CN 117310871B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 287
- 230000005540 biological transmission Effects 0.000 title claims abstract description 49
- 239000005387 chalcogenide glass Substances 0.000 title claims abstract description 40
- 239000000835 fiber Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims description 10
- 239000011521 glass Substances 0.000 claims abstract description 107
- 238000005253 cladding Methods 0.000 claims abstract description 72
- 239000000203 mixture Substances 0.000 claims abstract description 43
- 239000010410 layer Substances 0.000 claims abstract description 33
- 239000000126 substance Substances 0.000 claims abstract description 32
- 239000004417 polycarbonate Substances 0.000 claims abstract description 31
- 229920000515 polycarbonate Polymers 0.000 claims abstract description 31
- 239000012792 core layer Substances 0.000 claims abstract description 18
- 239000003365 glass fiber Substances 0.000 claims abstract description 17
- 238000002834 transmittance Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 30
- 239000010453 quartz Substances 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 10
- 229910052785 arsenic Inorganic materials 0.000 claims description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 8
- 238000004026 adhesive bonding Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000007747 plating Methods 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005566 electron beam evaporation Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 239000011162 core material Substances 0.000 description 16
- 229910018110 Se—Te Inorganic materials 0.000 description 12
- 238000003384 imaging method Methods 0.000 description 9
- 229920001169 thermoplastic Polymers 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 4
- 238000004433 infrared transmission spectrum Methods 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- 229920002492 poly(sulfone) Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007123 defense Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- -1 silver halide Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000001839 endoscopy Methods 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000075 oxide glass Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre compositions
- C03C13/041—Non-oxide glass compositions
- C03C13/043—Chalcogenide glass compositions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
- C03B37/01214—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube for making preforms of multifibres, fibre bundles other than multiple core preforms
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/10—Non-chemical treatment
- C03B37/16—Cutting or severing
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/104—Coating to obtain optical fibres
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/12—General methods of coating; Devices therefor
- C03C25/22—Deposition from the vapour phase
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
- G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention discloses an application of a chalcogenide glass fiber monofilament in preparing a long-wave infrared optical fiber image transmission beam. The long-wave infrared optical fiber image transmission bundle is formed by closely stacking a plurality of chalcogenide glass optical fiber monofilaments, wherein the chalcogenide glass optical fiber monofilaments sequentially comprise a glass fiber core layer, a glass inner cladding layer and a polycarbonate outer cladding layer from inside to outside. The chemical composition formula of the glass fiber core layer is As xSeyTe1‑x‑y, wherein x is more than or equal to 0.3 and less than or equal to 0.4,0.35 and y is more than or equal to 0.48; the chemical composition formula of the glass inner cladding is As nSemTe1‑n‑m, wherein n is more than or equal to 0.3 and less than or equal to 0.4,0.36 and m is more than or equal to 0.5; the refractive index n 1 of the glass fiber core layer is greater than the refractive index n 2 of the glass inner cladding layer. The long-wave infrared optical fiber image transmission beam has the advantages that the light transmission range of the long-wave infrared optical fiber image transmission beam can completely cover a wave band of 8-12 mu m, the chalcogenide glass optical fiber monofilament has higher average transmittance in the wave band, the lower breakage rate is realized under the smaller diameter of the optical fiber monofilament, meanwhile, the good flexibility of the optical fiber image transmission beam is considered, and the long-wave infrared optical fiber image transmission beam can be used for thermal image transmission of objects at room temperature.
Description
Technical Field
The invention belongs to the technical field of optical fiber image transmission devices, and particularly relates to application of a chalcogenide glass optical fiber monofilament in preparation of a long-wave infrared optical fiber image transmission beam.
Background
The optical fiber image transmission bundle (FB) is a flexible passive image transmission device, and is formed by arranging a plurality of optical fiber monofilaments according to a certain rule. FB has the characteristics of small volume, light weight, flexibility, electromagnetic interference resistance and the like, and has wide application prospect in the fields of national defense, medical treatment and industry. At present, FB manufactured based on oxide glass has been widely used in the fields of medical endoscopy, nondestructive inspection of engines, high-speed photography, 3D imaging, etc., and such FB mainly works in the visible-near infrared band. With the rapid development of infrared technology, fields such as aerospace, medical diagnosis and nuclear observation have put a strong demand for FB (fiber reinforced plastics) working in a 8-12 μm (long-wave infrared window of the atmosphere) band, because energy radiated by an object at room temperature is mainly concentrated in the band, and passive detection of the object can be realized in the band.
According to domestic and foreign research reports, the long-wave infrared FB mainly comprises chalcogenide glass FB, polycrystalline silver halide FB and hollow FB. The polycrystalline silver halide FB is manufactured by an extrusion process, and in the extrusion process, the fiber monofilaments are easily deformed, uneven areas are easily generated in the fiber bundle, and the crosstalk rate of the finally obtained FB is very high (usually up to 25%), so that the imaging quality is low. The hollow FB is manufactured by a method of assembling a single hollow glass capillary and then plating a metal and dielectric reflecting layer on the inner surface of the capillary, the loss of such hollow optical fiber is extremely high, the transmission loss of the hollow optical fiber having a pore diameter of 100 μm is generally several tens dB/m, and the loss is inversely proportional to the third power of the pore diameter. Compared with the prior art, the chalcogenide glass FB can be prepared by adopting a lamination technology and a multifilament technology, has the advantages of good uniformity of fiber and monofilament performance, low transmission loss, low inter-monofilament crosstalk rate and obvious performance advantages compared with other long-wave infrared FB. At present, the long-wave infrared chalcogenide glass FB is mainly prepared based on Ge- (As) Sb-Se, as-Se or Ge-As-Se-Te optical fibers, the light transmission ranges of the Ge- (As) Sb-Se, as-Se or Ge-As-Se-Te optical fibers are respectively 1.5-9 mu m, 1.5-10 mu m and 2.5-11 mu m, and the wavelength bands of 8-12 mu m are difficult to cover completely, so that the average transmittance of the FB in the wavelength bands of 8-12 mu m is lower, the signal to noise ratio of an imaging system is obviously reduced, and the detection distance is greatly shortened.
On the other hand, in order to enable the chalcogenide glass FB to transmit high quality thermal images, researchers have attempted to increase the resolution of the fiber monofilaments by reducing their diameter (resolution is inversely proportional to the fiber monofilament diameter). For a long time, flexible chalcogenide glass FB has generally been prepared by a lamination technique, and the diameter of an optical fiber monofilament in FB prepared by the technique is about 40 μm (corresponding to a maximum resolution of about 12 lp/mm), and finer monofilaments are extremely easy to break during the wire drawing and wire arranging process. In order to reduce the diameter of the monofilament in the chalcogenide glass FB, researchers use a high mechanical performance thermoplastic polymer similar to the drawing temperature of specific chalcogenide glass as an optical fiber outer cladding, so that the mechanical performance of the optical fiber monofilament is remarkably improved, a multifilament technology [ Optics Letters 40 (2015) 4384-4387,ZL 201410422692.9] for preparing high-resolution chalcogenide glass FB is developed, and the resolution of FB can reach more than 45 lp/mm. The limitations of this multifilament technology are: (1) For a particular chalcogenide glass, it is desirable to find a thermoplastic polymer that matches its drawing temperature, which polymer needs to be soluble in a particular solvent, and which polymer is not easily found; (2) In the technology, the FB with wax seals at two ends is required to be placed in a specific solvent to remove the thermoplastic polymer with the exposed middle part so as to realize good flexibility of the FB, the mechanical property of the optical fiber is weakened after the thermoplastic polymer is dissolved, and the breakage rate is easily increased in the use process.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a chalcogenide glass optical fiber monofilament which can completely cover the 8-12 mu m wave band in the light transmission range and has higher average transmittance, and a long-wave infrared FB formed by tightly stacking the chalcogenide glass optical fiber monofilament, and provides an improved preparation method of the FB.
In order to solve the technical problems, the invention adopts the following technical scheme:
A chalcogenide glass optical fiber monofilament, wherein the light transmission range of the chalcogenide glass optical fiber monofilament completely covers a 8-12 mu m wave band, the average transmittance in the wave band is high, and the chalcogenide glass optical fiber monofilament sequentially comprises a glass fiber core layer, a glass inner cladding layer and a polycarbonate outer cladding layer which are coaxially arranged from inside to outside; the chemical composition formula of the glass fiber core layer is As xSeyTe1-x-y, wherein x is more than or equal to 0.3 and less than or equal to 0.4,0.35 and y is more than or equal to 0.48; the chemical composition formula of the glass inner cladding is As nSemTe1-n-m, wherein n is more than or equal to 0.3 and less than or equal to 0.4,0.36 and m is more than or equal to 0.5; the refractive index n 1 of the glass fiber core layer is larger than the refractive index n 2 of the glass inner cladding layer.
The application of the chalcogenide glass fiber monofilaments in preparing long-wave infrared optical fiber image transmission beams is that the long-wave infrared optical fiber image transmission beams are formed by tightly stacking a plurality of chalcogenide glass fiber monofilaments.
The application comprises the following steps:
step 1, preparing a fiber core glass rod
Mixing simple substances of As, se and Te according to the chemical composition formula of the glass fiber core layer and corresponding molar proportions to obtain a first glass mixture; preparing a first glass mixture into a fiber core glass rod in a quartz tube by adopting a vacuum melting-quenching method;
Step 2, preparing an inner cladding glass tube
Mixing simple substances of As, se and Te according to the chemical composition formula of the glass inner cladding according to the corresponding molar ratio to obtain a second glass mixture; preparing the second glass mixture into inner cladding glass in a quartz tube by adopting a vacuum melting-quenching method; then adopting a vacuum coil method to manufacture the inner cladding glass into an inner cladding glass tube in the quartz tube;
step 3, preparing a primary optical fiber preform
Obtaining an outer cladding polycarbonate tube; inserting an inner cladding glass tube into an outer cladding polycarbonate tube, and inserting a fiber core glass rod into the inner cladding glass tube to obtain a primary optical fiber preform with a three-layer coaxial structure;
Step 4, preparing the optical fiber monofilament bundle
Drawing the primary optical fiber preform rod to obtain an optical fiber monofilament with the diameter of 1-2 mm, and cutting; tightly stacking a plurality of optical fiber monofilaments to obtain a first optical fiber monofilament bundle and a second optical fiber monofilament bundle respectively, wherein the number of the optical fiber monofilaments contained in each layer of the first optical fiber monofilament bundle is N+1, N, N +1, N, N +1 and N … … from bottom to top, the number of the optical fiber monofilaments contained in each layer of the second optical fiber monofilament bundle is N, N +1, N, N +1 and N, N +1 … … from bottom to top, and N is a positive integer;
step 5, preparing a secondary optical fiber preform
Performing heat treatment on the first optical fiber single filament bundle and the second optical fiber single filament bundle respectively to bond polycarbonate materials together to obtain a second optical fiber preform A and a second optical fiber preform B respectively;
step 6, preparing the optical fiber multifilament
Drawing the secondary optical fiber preform A and the secondary optical fiber preform B to obtain an optical fiber multifilament A and an optical fiber multifilament B, and placing a limiting die below the secondary optical fiber preform A and the secondary optical fiber preform B during drawing so that the optical fiber multifilament A and the optical fiber multifilament B pass through the limiting die to prevent the optical fiber multifilament A and the optical fiber multifilament B from rotating in the drawing process;
Step 7, preparing an optical fiber image transmission bundle blank:
Cutting the optical fiber multifilament A and the optical fiber multifilament B, and then performing seamless splicing on a plurality of optical fiber multifilament A and a plurality of optical fiber multifilament B to obtain an optical fiber multifilament bundle; thermally gluing two ends of the optical fiber multifilament bundle to obtain an optical fiber image transmission bundle blank;
Step 8, preparing an optical fiber image transmission beam finished product:
Armoring the optical fiber image transmission beam blank, polishing two end surfaces of the optical fiber image transmission beam blank, and finally plating antireflection films on the two end surfaces by utilizing an electron beam evaporation coating method.
Preferably, the quartz tube used in step 1 and step 2 has a hydroxyl group content of <5ppm.
Preferably, the cross sections of the secondary optical fiber preform a and the secondary optical fiber preform B in the step 5 are square.
Preferably, in the step 6, the limit die is a cylindrical die with a square through hole on the central axis, and the length and the width of the square through hole are smaller than the diagonal lengths of the optical fiber multifilament A and the optical fiber multifilament B; the cross sections of the optical fiber multifilaments A and B are square, and the diagonal length is <400 μm.
Preferably, the drawing temperature of the optical fiber monofilament in step 4 and the optical fiber multifilament in step 6 is 200 to 230 ℃.
Preferably, the temperature of the heat treatment in step 5 and the heat gluing in step 7 are both 135-145 ℃.
The long-wave infrared optical fiber image transmission beam obtained by the application has the wire breakage rate of less than 0.5 percent, and when the ratio of the length of the long-wave infrared optical fiber image transmission beam to the length of the diagonal line of the cross section of the long-wave infrared optical fiber image transmission beam is more than 40, the two ends of the long-wave infrared optical fiber image transmission beam can be bent by more than 150 degrees.
The long-wave infrared optical fiber image transmission beam is applied to infrared thermal imaging of an object at room temperature.
Design principle:
The As-Se-Te chalcogenide glass fiber has better transmittance in a long-wave infrared band, and the FB with higher transmittance in a band of 8-12 mu m can be prepared based on the chalcogenide glass fiber. However, as-Se-Te glasses have very low drawing temperatures, typically less than 230 ℃, and very poor mechanical properties, and are very prone to breakage during drawing and wire-drawing. The prior art suggests that polysulfone resin and As-Se-Te glass can be co-drawn into an optical fiber to improve the mechanical property (ZL 201410422692.9), but the drawing temperature (240-320 ℃) of the polysulfone resin is higher. Although As-Se-Te chalcogenide glass and polysulfone resin can be co-drawn into an optical fiber at around 240 ℃, different degrees of crystallization have occurred in the obtained optical fiber, resulting in a significant decrease in the transmittance of the optical fiber (average transmittance <20% in the 8-12 μm band for 500mm length optical fiber). The invention discovers that the drawing temperature of part of As-Se-Te glass is similar to the drawing temperature (180-240 ℃) of high mechanical property thermoplastic polymer polycarbonate, and the drawing temperature matching of the part of As-Se-Te glass with the polycarbonate can be realized by optimizing the composition of the As-Se-Te glass. The present invention has also found that FB obtained after heat-gluing both ends of a bundle of optical fiber multifilaments formed by stacking finer optical fiber multifilaments has a better flexibility. Thus, the obtained FB can be made to have good flexibility by optimizing the cross-sectional dimension of the optical fiber multifilament and the FB length without dissolving out the polycarbonate in the middle of the FB.
Compared with the prior art, the chalcogenide glass optical fiber monofilament and the application thereof in preparing the long-wave infrared FB have the following advantages:
(1) The light transmission range of the chalcogenide glass optical fiber monofilament can completely cover a 8-12 mu m wave band, the average transmittance of the chalcogenide glass optical fiber monofilament in the wave band is high (the transmittance of the optical fiber monofilament with the length of 500mm is more than 60%), the chalcogenide glass optical fiber monofilament can be used for preparing long-wave infrared FB working in the 8-12 mu m wave band, and the signal to noise ratio of an imaging system is improved. The prepared long-wave infrared FB can be used for thermal image transmission of objects at room temperature, and has extremely important application in the fields of national defense, aerospace and medical treatment.
(2) The mechanical property of the As-Se-Te glass optical fiber is extremely poor, and the polycarbonate is used As an outer cladding material of the optical fiber, so that the mechanical property of the As-Se-Te glass optical fiber can be greatly improved, and the breakage rate of FB (less than 0.5%) is remarkably reduced; because the drawing temperature of the polycarbonate is matched with the drawing temperature of the As-Se-Te glass, crystallization of different degrees in the glass can be avoided in the process of co-drawing the optical fiber, thereby avoiding the remarkable reduction of the transmittance of the optical fiber.
(3) In the preparation method, when the optical fiber multifilament is drawn, the optical fiber multifilament passes through a limiting die with a slightly larger size so as to prevent the optical fiber multifilament from rotating in the drawing process, thereby avoiding the rotation of a local image in imaging caused by the rotation of the multifilament in the FB finally prepared.
(4) In the preparation method, two optical fiber multifilament matched in structure are used for realizing seamless splicing, so that the influence on the imaging quality of FB caused by gaps generated by dislocation of optical fiber monofilaments can be avoided.
(5) In the preparation method, the thinner optical fiber multifilament (with the diagonal length of less than 400 mu m and better flexibility) is spliced and stacked into the optical fiber multifilament bundle, and the FB formed by hot gluing the two ends of the optical fiber multifilament bundle has good flexibility without dissolving thermoplastic polymer polycarbonate in the middle of the FB, so that the surface of the glass optical fiber is always protected by polycarbonate with high mechanical property, and the fiber breakage rate of the FB is not easy to increase in the use process. Compared with the prior art, the preparation method omits the thermoplastic polymer dissolution step, and finally realizes lower breakage rate under the condition of smaller fiber monofilament diameter, and simultaneously gives consideration to good flexibility of FB.
Drawings
FIG. 1 is a schematic diagram of key preparation steps of FB in example 1, (a) assembling a core glass rod, an inner cladding glass sleeve, and an outer cladding polycarbonate from inside to outside into a primary optical fiber preform of a three-layer coaxial structure; (b) Tightly stacking 60 optical fiber monofilaments to form a secondary optical fiber preform A and a secondary optical fiber preform B; (c) 725 optical fiber multifilaments are closely packed to form an optical fiber multifilament bundle.
FIG. 2 is a partial photograph of a cross-section of the finished As 0.4Se0.35Te0.25/As0.4Se0.36Te0.24/polycarbonate (core/inner cladding/outer cladding) FB product of example 1 taken using an optical microscope.
FIG. 3 is a graph of infrared transmission spectrum contrast for an As 0.4Se0.35Te0.25 glass and a Ge 0.1As0.3Se0.4Te0.2 glass having a thickness of 10 mm.
FIG. 4 is an infrared image of a 50℃heat source acquired through the finished As 0.4Se0.35Te0.25/As0.4Se0.36Te0.24/polycarbonate FB product of example 1 using a FLIR T640 infrared camera.
Detailed Description
The present invention will be further illustrated by the following examples, but the scope of the present invention is not limited to the examples.
Example 1
The chemical composition formula of a glass fiber core layer of the long-wave infrared chalcogenide glass fiber monofilament is As 0.4Se0.35Te0.25, the chemical composition formula of a glass inner cladding layer is As 0.4Se0.36Te0.24, and an outer cladding layer material is polycarbonate; the FB cross section was a square of 6mm by 6mm (diagonal length about 8.5 mm), which was made up of 43500 optical fiber filaments of about 30 μm diameter closely packed, prepared as follows:
Preparing a fiber core glass rod: according to a chemical composition formula As 0.4Se0.35Te0.25 of the glass fiber core layer, mixing simple substances of As, se and Te with purity of 99.9999 percent according to corresponding molar ratio to obtain a first glass mixture; preparing a first glass mixture into a fiber core glass rod with the diameter of about 14.9mm by adopting a vacuum melting-quenching method in a quartz tube with the hydroxyl content of less than 5ppm and the inner diameter and the outer diameter of 15mm and 19mm respectively;
Preparing an inner cladding glass tube: according to a chemical composition formula As 0.4Se0.36Te0.24 of the glass inner cladding, mixing simple substances of As, se and Te with the purity of 99.9999 percent according to the corresponding molar ratio to obtain a second glass mixture; preparing the second glass mixture into inner cladding glass in a quartz tube with the hydroxyl content of less than 5ppm and the inner and outer diameters of 23mm and 19mm respectively by adopting a vacuum melting-quenching method; then adopting a vacuum coil method to manufacture the inner cladding glass into an inner cladding glass tube with the inner diameter of 15mm and the outer diameter of 18.9mm in the quartz tube;
Preparing a primary optical fiber preform: obtaining an outer cladding polycarbonate tube with the inner diameter and the outer diameter of 19mm and 20mm respectively; inserting an inner cladding glass tube into an outer cladding polycarbonate tube, and inserting a core glass rod into the inner cladding glass tube to obtain a primary optical fiber preform of a three-layer coaxial structure, as shown in FIG. 1 (a);
Preparing an optical fiber monofilament bundle: drawing the primary optical fiber preform rod into an optical fiber monofilament with the diameter of about 1.8mm at the temperature of 228 ℃, and cutting the optical fiber monofilament into sections with the length of more than or equal to 60, wherein the length of each section is about 15cm; in a mould with a rectangular cross section, tightly stacking 60 optical fiber monofilaments with the length of about 15cm to obtain a first optical fiber monofilament bundle and a second optical fiber monofilament bundle with the cross section dimension of about 14.4mm multiplied by 12.7mm respectively, wherein the number of the optical fiber monofilaments contained in each layer of the first optical fiber monofilament bundle is 8, 7, 8, 7 and 7 in sequence from bottom to top, and the number of the optical fiber monofilaments contained in each layer of the second optical fiber monofilament bundle is 7, 8, 7 and 8 in sequence from bottom to top.
Preparing a secondary optical fiber preform: performing heat treatment on the first optical fiber monofilament bundles and the second optical fiber monofilament bundles at 135 ℃ respectively to bond polycarbonate materials together to obtain a secondary optical fiber preform A and a secondary optical fiber preform B respectively, as shown in fig. 1 (B);
Preparing an optical fiber multifilament: the secondary optical fiber preform A and the secondary optical fiber preform B were drawn at 224℃into an optical fiber multifilament A and an optical fiber multifilament B each having a cross-sectional dimension of about 240 μm by 212 μm (a diagonal length of about 320 μm), and a cylindrical limiting die having a square through-hole formed in a central axis thereof (the cross-sectional dimension of the square through-hole being 280 μm by 250 μm) was placed under the secondary optical fiber preform A and the secondary optical fiber preform B during drawing, and the optical fiber multifilament A and the optical fiber multifilament B were passed through the limiting die to prevent the optical fiber multifilament A and the optical fiber multifilament B from rotating during drawing.
Preparing FB blank: cutting the optical fiber multifilament A and the optical fiber multifilament B into sections with the length of more than or equal to 725, wherein the length of each section is about 500mm; in a square cross-section mold, 725 optical fiber multifilament yarn A and optical fiber multifilament yarn B with the length of about 500mm are seamlessly spliced into an optical fiber multifilament bundle with the side length of about 6mm (as shown in fig. 1 (c)); and (5) thermally gluing two ends of the optical fiber multifilament bundle at 135 ℃ to obtain the FB blank.
Preparing a FB finished product: and armoring the FB blank, polishing two end surfaces, and plating antireflection films on the two end surfaces by adopting an electron beam evaporation coating method to obtain a long-wave infrared FB finished product.
Fig. 2 is a partial photograph of a cross-section of the FB product of this example taken using an optical microscope, and it can be seen from fig. 2 that the center-to-center distance between two adjacent optical fiber monofilaments (i.e., the diameter of the optical fiber monofilaments) is about 30 μm. The refractive indices n 1 and n 2 of the glass core material As 0.4Se0.35Te0.25 and the glass inner cladding material As 0.4Se0.36Te0.24 at a wavelength of 10 μm were measured using an infrared variable angle ellipsometer (IR-VASE, J.A.Woollam, USA) and 3.043 and 3.029, respectively. An infrared transmission spectrum of As 0.4Se0.35Te0.25 glass having a thickness of 10mm was measured using a Fourier transform infrared spectrometer (Tensor 27, bruker, germany) As shown in FIG. 3; by way of comparison, the infrared transmission spectrum of a10 mm thick Ge 0.1As0.3Se0.4Te0.2 glass (a typical long-wave infrared chalcogenide glass of the prior art) is also shown; as can be seen, the As 0.4Se0.35Te0.25 glass has excellent light transmission properties throughout the 8-12 μm band, while the Ge 0.1As0.3Se0.4Te0.2 glass exhibits significant multi-phonon absorption in the 11-12 μm band. The average transmittance of the optical fiber monofilaments in the FB finished product in the wave band of 8-12 mu m is 68.2% measured by adopting an imaging gray scale contrast method. And (3) irradiating one end of the FB finished product by using a parallel light beam with the wavelength of 10.6 mu m emitted by a CO 2 laser, photographing the other end of the optical fiber bundle finished product by using an FLIR T640 infrared camera, and measuring the breakage rate of the FB finished product to be about 0.27%. One end of the FB finished product is kept fixed, and the other end of the FB finished product can be bent by more than 180 degrees, which indicates that the FB finished product has good flexibility. Fig. 4 is an infrared image of a 50 ℃ heat source acquired through the FB product using FLIR T640 infrared camera, and as can be seen from fig. 4, the image is clear and undistorted, indicating that the FB product has good image transmission properties.
Example 2
The chemical composition formula of a glass fiber core layer of the long-wave infrared chalcogenide glass fiber monofilament is As 0.35Se0.4Te0.25, the chemical composition formula of a glass inner cladding layer is As 0.35Se0.42Te0.23, and an outer cladding layer material is polycarbonate; a square with a cross section of 5.5mm by 5.5mm (diagonal length of about 7.8 mm) of FB made up of 42224 optical fiber filaments with a diameter of about 28 μm in close packing was prepared as follows:
preparing a fiber core glass rod: according to a chemical composition formula As 0.35Se0.4Te0.25 of the glass fiber core layer, mixing As with the purity of 99.99999 percent, se with the purity of 99.9999 percent and Te simple substance according to corresponding molar ratio to obtain a first glass mixture; preparing a first glass mixture into a fiber core glass rod with the diameter of about 14.9mm by adopting a vacuum melting-quenching method in a quartz tube with the hydroxyl content of less than 5ppm and the inner diameter and the outer diameter of 15mm and 19mm respectively;
Preparing an inner cladding glass tube: according to a chemical composition formula As 0.35Se0.42Te0.23 of the glass inner cladding, mixing As with the purity of 99.99999%, and simple substances of Se and Te with the purity of 99.9999% according to corresponding molar proportions to obtain a second glass mixture; preparing the second glass mixture into inner cladding glass in a quartz tube with the hydroxyl content of less than 5ppm and the inner and outer diameters of 23mm and 19mm respectively by adopting a vacuum melting-quenching method; then adopting a vacuum coil method to manufacture the inner cladding glass into an inner cladding glass tube with the inner diameter of 15mm and the outer diameter of 18.9mm in the quartz tube;
Preparing a primary optical fiber preform: obtaining an outer cladding polycarbonate tube with the inner diameter and the outer diameter of 19mm and 20mm respectively; inserting an inner cladding glass tube into an outer cladding polycarbonate tube, and inserting a fiber core glass rod into the inner cladding glass tube to obtain a primary optical fiber preform with a three-layer coaxial structure;
Preparing a secondary optical fiber preform: drawing the primary optical fiber preform into an optical fiber monofilament with the diameter of about 1.6mm at 214 ℃, and cutting into sections with the length of more than or equal to 52, wherein the length of each section is about 15cm; in a square cross section die, 52 optical fiber monofilaments with the length of about 15cm are closely stacked to obtain a first optical fiber monofilament bundle and a second optical fiber monofilament bundle with the cross section size of about 11.2mm multiplied by 11.2mm respectively, wherein the number of optical fiber monofilaments contained in each layer of the first optical fiber monofilament bundle is 7, 6, 7 and 6 in sequence from bottom to top, and the number of optical fiber monofilaments contained in each layer of the second optical fiber monofilament bundle is 6, 7, 6 and 7 in sequence from bottom to top.
Preparing a secondary optical fiber preform: respectively carrying out heat treatment on the first optical fiber monofilament bundle and the second optical fiber monofilament bundle at 140 ℃ to bond polycarbonate materials together to respectively obtain a second-stage optical fiber preform A and a second-stage optical fiber preform B;
Preparing an optical fiber multifilament: the secondary optical fiber preform A and the secondary optical fiber preform B were drawn at 212℃into an optical fiber multifilament A and an optical fiber multifilament B each having a cross-sectional dimension of about 196. Mu.m.times.196. Mu.m (a diagonal length of about 277. Mu.m), and a cylindrical limiting die (having a cross-sectional dimension of 240. Mu.m.times.240. Mu.m) having a square through hole formed in a central axis thereof was placed under the secondary optical fiber preform A and the secondary optical fiber preform B during drawing, and the optical fiber multifilament A and the optical fiber multifilament B were passed through the limiting die to prevent the optical fiber multifilament A and the optical fiber multifilament B from rotating during drawing.
Preparing FB blank: cutting the optical fiber multifilament A and the optical fiber multifilament B into more than or equal to 812 sections, wherein the length of each section is about 500mm; in a square cross section mold, 812 optical fiber multifilament A and optical fiber multifilament B with the length of about 500mm are spliced into an optical fiber multifilament bundle with the side length of about 5.5 mm; and (5) thermally gluing two ends of the optical fiber multifilament bundle at 140 ℃ to obtain the FB blank.
Preparing an optical fiber image transmission beam finished product: armoring the FB blank, polishing two end faces, and plating antireflection films on the two end faces by adopting an electron beam evaporation coating method to obtain a long-wave infrared chalcogenide glass FB finished product.
The fiber filament diameter was observed to be about 28 μm using an optical microscope. The refractive indices n 1 and n 2 of the glass core material As 0.35Se0.4Te0.25 and the glass inner cladding material As 0.35Se0.42Te0.23 were measured using an infrared variable angle ellipsometer (IR-VASE, J.A.Woollam, USA) to be 3.017 and 2.988, respectively, at a wavelength of 10 μm. The average transmittance of the optical fiber monofilaments in the FB finished product in the wave band of 8-12 mu m is 64.1% measured by adopting an imaging gray scale contrast method. And (3) irradiating one end of the FB finished product by using a parallel light beam with the wavelength of 10.6 mu m emitted by a CO 2 laser, photographing the other end of the optical fiber bundle finished product by using an FLIR T640 infrared camera, and measuring the breakage rate of the FB finished product to be about 0.37 percent. One end of the FB finished product is kept fixed, and the other end of the FB finished product can be bent by more than 180 degrees, which shows that the FB finished product has good flexibility.
Example 3
The chemical composition formula of a glass fiber core layer of the long-wave infrared chalcogenide glass fiber monofilament is As 0.3Se0.48Te0.22, the chemical composition formula of a glass inner cladding layer is As 0.3Se0.5Te0.2, and an outer cladding layer material is polycarbonate; an FB rectangular shape having a cross section of 9.2mm×7.4mm (diagonal length of about 11.8 mm) constituted by a compact stack of 132480 optical fiber monofilaments having a diameter of about 24 μm was prepared by the following steps:
Preparing a fiber core glass rod: according to a chemical composition formula As 0.3Se0.48Te0.22 of the glass fiber core layer, mixing simple substances of As, se and Te with purity of 99.9999 percent according to corresponding molar ratio to obtain a first glass mixture; preparing a first glass mixture into a fiber core glass rod with the diameter of about 14.9mm by adopting a vacuum melting-quenching method in a quartz tube with the hydroxyl content of less than 5ppm and the inner diameter and the outer diameter of 15mm and 19mm respectively;
preparing an inner cladding glass tube: according to a chemical composition formula As 0.3Se0.5Te0.2 of the glass inner cladding, mixing simple substances of As, se and Te with the purity of 99.99999 percent according to corresponding molar proportions to obtain a second glass mixture; preparing the second glass mixture into inner cladding glass in a quartz tube with the hydroxyl content of less than 5ppm and the inner and outer diameters of 23mm and 19mm respectively by adopting a vacuum melting-quenching method; then adopting a vacuum coil method to manufacture the inner cladding glass into an inner cladding glass tube with the inner diameter of 15mm and the outer diameter of 18.9mm in the quartz tube;
Preparing a primary optical fiber preform: obtaining an outer cladding polycarbonate tube with the inner diameter and the outer diameter of 19mm and 20mm respectively; inserting an inner cladding glass tube into an outer cladding polycarbonate tube, and inserting a fiber core glass rod into the inner cladding glass tube to obtain a primary optical fiber preform with a three-layer coaxial structure;
preparing a secondary optical fiber preform: drawing the primary optical fiber preform into an optical fiber monofilament with the diameter of about 1.2mm at 206 ℃, and cutting into sections with the length of not less than 138 and the length of each section being about 15cm; in a die with a rectangular cross section, 138 optical fiber monofilaments with the length of about 15cm are closely stacked to respectively obtain a first optical fiber monofilament bundle and a second optical fiber monofilament bundle with the cross section dimension of about 14.4mm multiplied by 12.6mm, wherein the number of the optical fiber monofilaments contained in each layer of the first optical fiber monofilament bundle is sequentially 12, 11, 12 and 11 from bottom to top, and the number of the optical fiber monofilaments contained in each layer of the second optical fiber monofilament bundle is sequentially 11, 12, 11 and 12 from bottom to top.
Preparing a secondary optical fiber preform: respectively carrying out heat treatment on the first optical fiber monofilament bundle and the second optical fiber monofilament bundle at 145 ℃ to bond polycarbonate materials together to respectively obtain a second-stage optical fiber preform A and a second-stage optical fiber preform B;
Preparing an optical fiber multifilament: the two-stage optical fiber preform A and the two-stage optical fiber preform B were drawn at 202℃into an optical fiber multifilament A and an optical fiber multifilament B each having a cross-sectional dimension of about 288 μm by 252 μm (a diagonal length of about 383 μm), and a cylindrical limiting die (a cross-sectional dimension of 340 μm by 300 μm) having a square through hole in a central axis was placed under the two-stage optical fiber preform A and the two-stage optical fiber preform B during drawing, and the optical fiber multifilament A and the optical fiber multifilament B were passed through the limiting die to prevent the optical fiber multifilament A and the optical fiber multifilament B from rotating during drawing.
Preparing FB blank: cutting the optical fiber multifilament A and the optical fiber multifilament B into sections with the length of more than or equal to 960, wherein the length of each section is about 500mm; in a mold with rectangular cross section, performing seamless splicing on 960 optical fiber multifilament yarns A and B with the length of about 500mm to obtain an optical fiber multifilament bundle with the cross section dimension of about 9.2mm multiplied by 7.4 mm; both ends of the fiber multifilament bundle were heat-glued at 145 ℃ to obtain FB blanks.
Preparing an optical fiber image transmission beam finished product: armoring the FB blank, polishing two end faces, and plating antireflection films on the two end faces by adopting an electron beam evaporation coating method to obtain a long-wave infrared chalcogenide glass FB finished product.
The fiber filament diameter was observed to be about 24 μm using an optical microscope. The refractive indices n 1 and n 2 of the material As 0.3Se0.48Te0.22 of the glass core layer and the material As 0.3Se0.5Te0.2 of the glass inner cladding layer were measured at a wavelength of 10 μm As 2.948 and 2.920, respectively, using an infrared variable angle ellipsometer (IR-VASE, J.A.Woollam, USA). The average transmittance of the optical fiber monofilaments in the FB finished product in the wave band of 8-12 mu m is 60.4% measured by adopting an imaging gray scale contrast method. And (3) irradiating one end of the FB finished product by using a parallel light beam with the wavelength of 10.6 mu m emitted by a CO 2 laser, photographing the other end of the optical fiber bundle finished product by using an FLIR T640 infrared camera, and measuring the breakage rate of the FB finished product to be about 0.42%. One end of the FB finished product is kept fixed, and the other end of the FB finished product can be bent by more than 150 degrees, which shows that the FB finished product has good flexibility.
Claims (7)
1. The application of the chalcogenide glass fiber monofilament in preparing a long-wave infrared optical fiber image transmission beam is characterized in that: the long-wave infrared optical fiber image transmission beam is formed by tightly stacking a plurality of chalcogenide glass optical fiber monofilaments; the specific preparation process comprises the following steps:
step 1, preparing a fiber core glass rod
Mixing simple substances of As, se and Te according to the chemical composition formula of the glass fiber core layer and corresponding molar proportions to obtain a first glass mixture; preparing a first glass mixture into a fiber core glass rod in a quartz tube by adopting a vacuum melting-quenching method;
Step 2, preparing an inner cladding glass tube
Mixing simple substances of As, se and Te according to the chemical composition formula of the glass inner cladding according to the corresponding molar ratio to obtain a second glass mixture; preparing the second glass mixture into inner cladding glass in a quartz tube by adopting a vacuum melting-quenching method; then adopting a vacuum coil method to manufacture the inner cladding glass into an inner cladding glass tube in the quartz tube;
step 3, preparing a primary optical fiber preform
Obtaining an outer cladding polycarbonate tube; inserting an inner cladding glass tube into an outer cladding polycarbonate tube, and inserting a fiber core glass rod into the inner cladding glass tube to obtain a primary optical fiber preform with a three-layer coaxial structure;
Step 4, preparing the optical fiber monofilament bundle
Drawing the primary optical fiber preform rod to obtain an optical fiber monofilament with the diameter of 1-2 mm, and cutting; tightly stacking a plurality of optical fiber monofilaments to obtain a first optical fiber monofilament bundle and a second optical fiber monofilament bundle respectively, wherein the number of the optical fiber monofilaments contained in each layer of the first optical fiber monofilament bundle is N+1, N, N +1, N, N +1 and N … … from bottom to top, the number of the optical fiber monofilaments contained in each layer of the second optical fiber monofilament bundle is N, N +1, N, N +1 and N, N +1 … … from bottom to top, and N is a positive integer;
step 5, preparing a secondary optical fiber preform
Performing heat treatment on the first optical fiber single filament bundle and the second optical fiber single filament bundle respectively to bond polycarbonate materials together to obtain a second optical fiber preform A and a second optical fiber preform B respectively;
step 6, preparing the optical fiber multifilament
Drawing the secondary optical fiber preform A and the secondary optical fiber preform B to obtain an optical fiber multifilament A and an optical fiber multifilament B, and placing a limiting die below the secondary optical fiber preform A and the secondary optical fiber preform B during drawing so that the optical fiber multifilament A and the optical fiber multifilament B pass through the limiting die to prevent the optical fiber multifilament A and the optical fiber multifilament B from rotating in the drawing process, wherein the limiting die is a cylindrical die with square through holes on the central axis, and the length and the width of the square through holes are smaller than the diagonal lengths of the optical fiber multifilament A and the optical fiber multifilament B;
Step 7, preparing an optical fiber image transmission bundle blank:
Cutting the optical fiber multifilament A and the optical fiber multifilament B, and then performing seamless splicing on a plurality of optical fiber multifilament A and a plurality of optical fiber multifilament B to obtain an optical fiber multifilament bundle; thermally gluing two ends of the optical fiber multifilament bundle to obtain an optical fiber image transmission bundle blank;
Step 8, preparing an optical fiber image transmission beam finished product:
armoring the blank of the optical fiber image transmission beam, polishing two end surfaces of the blank, and finally plating antireflection films on the two end surfaces by utilizing an electron beam evaporation coating method;
the light transmission range of the chalcogenide glass optical fiber monofilament completely covers a wave band of 8-12 mu m, the average transmittance of the wave band is high, and the chalcogenide glass optical fiber monofilament sequentially comprises a glass fiber core layer, a glass inner cladding layer and a polycarbonate outer cladding layer which are coaxially arranged from inside to outside; the chemical composition formula of the glass fiber core layer is As xSeyTe1-x-y, wherein x is more than or equal to 0.3 and less than or equal to 0.4,0.35 and y is more than or equal to 0.48; the chemical composition formula of the glass inner cladding is As nSemTe1-n-m, wherein n is more than or equal to 0.3 and less than or equal to 0.4,0.36 and m is more than or equal to 0.5; the refractive index n 1 of the glass fiber core layer is larger than the refractive index n 2 of the glass inner cladding layer.
2. The use according to claim 1, wherein: the hydroxyl group content of the quartz tube used in step 1 and step 2 was <5 ppm.
3. The use according to claim 1, wherein: and 5, the cross sections of the secondary optical fiber preform A and the secondary optical fiber preform B in the step 5 are square.
4. The use according to claim 1, wherein: in the step 6, the limiting die is a cylindrical die with a square through hole on the central axis, and the length and the width of the square through hole are smaller than the diagonal length of the optical fiber multifilament A and the optical fiber multifilament B; the cross sections of the optical fiber multifilaments A and B are square, and the diagonal length is <400 μm.
5. The use according to claim 1, wherein: the drawing temperature of the optical fiber monofilament in step 4 and the optical fiber multifilament in step 6 was 200 oC~230 o C.
6. The use according to claim 1, wherein: the temperature of the heat treatment in step 5 and the heat bonding of the two ends of the fiber multifilament bundle in step 7 are both 135 oC~145 o C.
7. The long-wave infrared optical fiber image transmission beam obtained based on the application of claim 1, wherein the breakage rate of the long-wave infrared optical fiber image transmission beam is less than 0.5%, and when the ratio of the length of the long-wave infrared optical fiber image transmission beam to the length of the diagonal line of the cross section of the long-wave infrared optical fiber image transmission beam is more than 40, the two ends of the long-wave infrared optical fiber image transmission beam can be bent to more than 150 o.
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