CN110333570A - A kind of hollow passes can mid-infrared light fibre and preparation method thereof - Google Patents
A kind of hollow passes can mid-infrared light fibre and preparation method thereof Download PDFInfo
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- CN110333570A CN110333570A CN201910529236.7A CN201910529236A CN110333570A CN 110333570 A CN110333570 A CN 110333570A CN 201910529236 A CN201910529236 A CN 201910529236A CN 110333570 A CN110333570 A CN 110333570A
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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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- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02033—Core or cladding made from organic material, e.g. polymeric material
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- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/032—Optical fibres with cladding with or without a coating with non solid core or cladding
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- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
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Abstract
The invention discloses a kind of hollows to pass energy mid-infrared light fibre and preparation method thereof; the fiber optic applications are in quantum cascade laser; in hollow tubular, comprising: fibre cladding and its interior air-core, and it is set to the fiber polymer protective layer of the outer surface of fibre cladding；Fibre cladding includes the polymeric layer of alternate intervals arrangement and the chalcogenide glass layer comprising tellurium element.In IR transmitting energy hollow fibers covering of the invention, chalcogenide glass layer and the arrangement of polymeric layer periodic intervals constitute photonic band gap structure.Due to containing tellurium element in covering and two kinds of materials have high index-contrast, guarantee wide transmission range (3-20 μm of covering) and its interior low-loss.In addition, being air dielectric in fibre core, the damage threshold of optical fiber can be improved.Therefore, the present invention can rationally design above-mentioned periodic structure towards quantum cascade laser, realize the adjustability of transmission wave band.In addition, polymer makes optical fiber light, flexible, portable, the portable transmission that quantum cascade laser issues laser is realized.
Description
Technical field
The present invention relates to optical fiber optical technical fields, and passing more particularly to a kind of hollow can mid-infrared light fibre and its preparation side
Method.
Background technique
Quantum cascade laser (QCL) is a kind of novel mid and far infrared semiconductor laser, can provide the light of ultra-wide
Spectral limit (3-20 μm) has fabulous wavelength tunability, and can achieve very high output power, and can work at room temperature
Make, with good application prospect with biggish application range.Therefore, it effectively to play quantum cascade laser advantage, is used for
The optical fiber for the laser that transmission of quantum cascaded laser issues is most important.
Currently, widely used solid core optical fiber is since the intrinsic defect of its core material is for example non-linear, dispersion, photic damage
Deng, limit solid core optical fiber communication data transfer, junior engineering college transmission and ultraviolet, mid and far infrared, Terahertz,
The application in the fields such as microwave transmission.And hollow-core fiber due to its minimum non-linear, lower modal dispersion, high damage threshold,
The transmission speed of width transmission wave band and the intimate light velocity, can be used for breaking through the bottleneck of existing solid core optical fiber.
The Chinese invention patent of open (bulletin) number CN107876973A provides a kind of guide-lighting arm system, is led by metal
The mode of light pipe inner wall reflection constrains laser in internal transmission and adjusts by way of reflecting mirror laser direction.But such system
Volume is big, and weight is heavy and system itself does not have flexibility.To guarantee that the transmission of mid and far infrared laser has portability, proposed adoption is light,
Carefully and there is transmission mode of the optical fiber flexible as mid and far infrared laser.
The Chinese invention patent of open (bulletin) number CN108732680A provides a kind of chalcogenide glass fiber, passes through sulphur system
The core covering structure that glass ingredient is formed, mid and far infrared laser is strapped in optical fiber.But this type optical fiber is led due to itself
Ray machine reason, low-loss band can only cover the range (2957nm and 4258nm) of very little and this type optical fiber due to itself material
The problem of, damage threshold is lower (< 15mW), it is difficult to bear high-power laser.It can in order to guarantee low-loss band of optical fibers
Tonality and the damage threshold for improving optical fiber, basic light guide structure of the proposed adoption hollow bandgap structure as optical fiber.
Therefore, in order to effectively play the function of quantum cascade laser, developing a kind of flexible has low-loss band can
Tonality and the optical fiber that can bear high power laser light are current urgent problems to be solved.
Summary of the invention
The present invention provide a kind of hollow pass can mid-infrared light fibre and preparation method thereof, existing be applied to quantum stage to solve
The optical fiber of connection laser is unable to satisfy the technical issues of quantum cascade laser all band low-loss transmission requires in real process.
The technical scheme to solve the above technical problems is that a kind of hollow passes energy mid-infrared light fibre, it is applied to amount
The laser of qc laser transmits, and is in hollow tubular, comprising: fibre cladding and its interior air-core, and it is set to institute
State the fiber polymer protective layer of the outer surface of fibre cladding；
Wherein, the fibre cladding includes the chalcogenide glass layer and polymeric layer of alternate intervals arrangement, the chalcogenide glass
It include tellurium element in the material of layer.
The beneficial effects of the present invention are: chalcogenide glass layer and polymeric layer are intervally arranged, periodic structure, the period are constituted
Property structure be photonic band gap structure (two kinds of alternate periodic structures of different refractivity material will lead to the light of some frequency without
Method passes through, and for this wave band that can not be passed through band gap, this structure is photonic band gap structure).Secondly as chalcogenide glass layer
Refractive index and the refractive index of polymer material generally differ larger, and two kinds of materials combine, it is ensured that preferable wave band filtering, especially
, contain tellurium element in the material of chalcogenide glass layer, transmission wave band can cover in Infrared Transmission wave band, expand applied to quantum
The low-loss transmission wave band of the optical fiber of cascaded laser.It further, is air dielectric in air-core, the lateral of laser energy expands
It dissipates relatively slowly, damage threshold of the laser in the optical fiber can be improved, and then improve the tolerance to high power laser light.Therefore, may be used
Based on actually required transmission wavelength, above-mentioned periodic structure is rationally designed, realizes the adjustability for transmitting wave band and a variety of wave bands
The low-loss transmission of laser (including high power laser light wave band).In addition, the use of polymeric layer, so that lightweight of the invention, soft
Property, it is portable, realize the portable transmission of quantum cascade laser laser.
On the basis of above-mentioned technical proposal, the present invention can also be improved as follows.
Further, the air-core is determined by the boundary of the chalcogenide glass layer.
Further beneficial effect of the invention is: optical fiber of hollow tubular proposed by the present invention itself can reduce loss, into
One step, compare polymer, chalcogenide glass material infrared laser is lost it is low, using chalcogenide glass layer as the innermost layer of covering,
It can guarantee lower infrared laser absorptivity (waste), the mid and far infrared laser of quantum cascade laser sending is effectively ensured
Low-loss transmission.
Further, the refractive index of the corresponding chalcogenide glass material of the chalcogenide glass layer is corresponding with the polymeric layer poly-
The difference for closing the refractive index of object material is greater than 0.5.
Further beneficial effect of the invention is: since photonic band gap structure is based on high index-contrast, to realize to part
The limitation of light, therefore, the difference of the refractive index of above two material is bigger, and band gap is bigger, and periodic structure imitates the filtering of laser
Fruit is better, and can guarantee lower transmission loss in broader transmission wave band and transmission wave band.
Further, the overall thickness in a covering period is determined based on actually required transmission optical maser wavelength, wherein described in one
The covering period is made of one layer of adjacent chalcogenide glass layer and one layer of polymeric layer.
Further beneficial effect of the invention is: wavelength based on practically necessary transmission or the wave not limited by covering
It is long, it determines two layers of overall thickness, embodies the physics adjustability of transmission wave band.
Further, the periodicity in the covering is greater than 5.
Further beneficial effect of the invention is: the periodicity of covering is greater than 5, its effect to wavelength limitation can be improved
Fruit improves the wavelength transmission purity of laser.
Further, the ratio between thickness of the chalcogenide glass layer and the polymeric layer is 1:7~2:1.
Further beneficial effect of the invention is: firstly, when chalcogenide glass is very few, polymer ratio is excessively high, due to poly-
Closing object has bigger absorption and ratio excessively to infrared light and extremely will lead to that adjustable low-loss band is less, relatively narrow, band
Gap reduces, and the loss of optical fiber can be made to increase；Secondly, when chalcogenide glass is excessive, polymer is very few, due to ratio and best ratio
The offset of example, the loss for also resulting in optical fiber increase, and since glass machinery performance is poor compared to polymer, the very few meeting of polymer
Mechanical fiber optic performance is caused to decline.In addition, the thickness of chalcogenide glass layer is unsuitable blocked up, to avoid higher manufacture difficulty.
The present invention also provides the preparation methods that a kind of hollow as described above passes energy mid-infrared light fibre, comprising:
One layer of chalcogenide glass is deposited on the surface of first polymer film in step 1, constitutes clad film, wherein the sulphur
It is glass include tellurium element；
Step 2, using pole, wind the clad film, and in the second polymerization of the outer surface of clad film winding
Object film obtains covering stick；
Step 3 carries out thermosetting to the covering stick, and removes the pole, obtains prefabricated rods；
Step 4 is based on wire drawing ratio, carries out drawing wire drawing to the prefabricated rods, obtains the hollow and passes energy mid-infrared light
It is fine.
The beneficial effects of the present invention are: can simply and easily realize above-mentioned periodic structure using this method, wherein
It adopts vapor deposition method and coats chalcogenide glass layer on the surface of thin polymer film, ensure that the uniformity of chalcogenide glass layer.
Further, the thickness of the first polymer film is less than 200 μm；The chalcogenide glass with a thickness of 2~30 μm.
Further beneficial effect of the invention is: the thickness of first polymer film is to be passed to guarantee no more than 200 μm
The adjustability of defeated low-loss band, the thickness of chalcogenide glass layer is less than 30 μm, to facilitate the winding of pole.
Further, in the step 1, the vacuum degree of the vapor deposition process is 10-3Pa magnitude and following.
Further beneficial effect of the invention is: covering caused by this method can pollute to avoid water oxygen is rotten, guarantees sulphur
It is that glass material characteristic does not change.
Further, the wire drawing ratio is determined based on required transmission optical maser wavelength.
Further beneficial effect of the invention is: the range of low-loss band depends primarily on the thickness in a covering period
Degree.Wire drawing ratio determines the thickness in a covering period, then according to the practical band gap (wavelength or do not limited by covering that optical fiber transmits
Wavelength) need, wire drawing ratio is determined, with the thickness in covering period needed for realizing band gap.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that a kind of hollow provided by one embodiment of the present invention passes energy mid-infrared light fibre；
Fig. 2 is the flow chart element for the preparation method that a kind of hollow provided by one embodiment of the present invention passes energy mid-infrared light fibre
Figure；
Fig. 3 is the bandgap structure figure that a kind of hollow provided by one embodiment of the present invention passes energy mid-infrared light fibre；
Fig. 4 is the bandgap structure figure that another hollow provided by one embodiment of the present invention passes energy mid-infrared light fibre.
In all the appended drawings, identical appended drawing reference is used to indicate identical element or structure, in which:
110 be fibre cladding, and 111 be a covering period, and 120 be air-core, and 130 be fiber polymer protective layer.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Embodiment one
A kind of hollow biography energy mid-infrared light fibre 100, the laser applied to quantum cascade laser transmits, as shown in Figure 1, being in
Hollow tubular, comprising: fibre cladding 110 and its interior air-core 120, and it is set to the optical fiber of the outer surface of fibre cladding
Polymer protective layer 130；Wherein, fibre cladding includes the chalcogenide glass layer and polymeric layer of alternate intervals arrangement, chalcogenide glass
It include tellurium element in the material of layer.
It should be noted that the right figure of Fig. 1, outermost virtual coil solid circles adjacent thereto are expressed as optical fiber polymerization
Object protective layer 130, the region determined between two solid circles are fibre cladding 110, the region of the solid circles delineation of innermost layer
As air-core 120.
The material selectable range of chalcogenide glass layer and polymeric layer is wide, and any thermoplasticity is strong, ir-absorbance is low, refraction
The chalcogenide glass material that the low polymer material of rate is low with softening temperature, low boiling point, refractive index are high is used equally for designing and construct
The structure (i.e. photonic band gap structure) of refractive index periodic variation makes the hollow and passes energy mid-infrared light fibre.
In addition, hollow, which passes energy mid-infrared light fibre structure, has physics adjustability.This optical fiber is without changing used in preparation
The adjustment of band gap locations only may be implemented by technologic variation (such as wire drawing ratio), realize in mid and far infrared wave band for material
The effect of unrestricted choice transmission wave band.
To guarantee that the transmission of mid and far infrared laser has a portability, proposed adoption is light, it is thin and have optical fiber flexible be used as in it is remote
The transmission mode of infrared laser.In order to achieve the effect that flexible transfer, polymer conduct inherently with superperformance is chosen
Main material, which makes, has fiber flexible in structure.
Fiber polymer protective layer ensure that optical fiber has certain mechanical performance, while can protect its endothecium structure.
Chalcogenide glass layer and polymeric layer are intervally arranged, and constitute periodic structure, which is photon band gap
(light that two kinds of alternate periodic structures of different refractivity material will lead to some frequency can not pass through structure, this can not wear
For the wave band crossed band gap, this structure is photonic band gap structure).Secondly as chalcogenide glass and polymer material all have it is good
In good infrared guide-lighting ability and between refringence with higher, two kinds of materials combine, it is ensured that preferable wave band filtering.
It further, is air dielectric in air-core, the horizontal proliferation of laser energy is slower, and damage of the laser in the optical fiber can be improved
Hurt threshold value, and then improves the tolerance to high power laser light.Therefore, it can be based on actually required transmission wavelength, rationally designed above-mentioned
The low-loss of periodic structure, the adjustability and a variety of wave band of laser (including high power laser light wave band) of realizing transmission wave band passes
It is defeated, meet quantum cascade laser all band low-loss transmission requirement in real process.In addition, the use of polymer, so that this
The optical fiber lightweight of invention, it is flexible, it is portable, realize the portable transmission of quantum cascade laser laser.
Preferably, air-core is determined by the boundary of chalcogenide glass layer.
The optical fiber of hollow tubular itself that the present embodiment proposes can reduce loss, and further, compare polymer, sulphur system glass
Glass material is low to infrared laser loss, using chalcogenide glass layer as the innermost layer of covering, can guarantee lower infrared laser damage
The low-loss transmission of the mid and far infrared laser of quantum cascade laser sending is effectively ensured in consumption.
Preferably, the refractive index polymer material corresponding with polymeric layer of the corresponding chalcogenide glass material of chalcogenide glass layer
Refractive index difference be greater than 0.5.
The refractive index of the corresponding chalcogenide glass material of chalcogenide glass layer can be 1.5-4, the corresponding polymer of polymeric layer
The refractive index of material can be 1.3-2.5.
Since photonic band gap structure is based on high index-contrast, to realize the limitation to part light, therefore, above two material
Refractive index difference it is bigger, band gap is bigger, and periodic structure is better to the filter effect of laser, and can guarantee wider transmission
Wave band simultaneously has lower loss in transmission wave band.
Preferably, the overall thickness in a covering period 111 is determined based on actually required transmission optical maser wavelength, wherein such as Fig. 1
Right figure shown in, a covering period is made of one layer of adjacent chalcogenide glass layer and one layer of polymeric layer, 111 in figure at point out
Three circle of dotted lines constitute adjacent two layers material layer.
Wavelength based on practically necessary transmission or the wavelength not limited by covering, determine two layers of overall thickness, embody
Transmit the adjustability of wave band.
Preferably, the periodicity in covering is greater than 5.
The periodicity of covering is greater than 5, its effect to wavelength limitation can be improved, reduce the transmission loss of laser.
Preferably, the ratio between thickness of chalcogenide glass layer and polymeric layer is 1:7~2:1.
Firstly, when chalcogenide glass is very few, polymer ratio is excessively high, since polymer has bigger suction to infrared light
Receive and ratio excessively extremely to will lead to adjustable low-loss band less, relatively narrow, band gap reduces, and can make the loss of optical fiber
Increase；Secondly, due to the offset of ratio and optimal proportion, also resulting in optical fiber when chalcogenide glass is excessive, polymer is very few
Loss increases, and since glass machinery performance is poor compared to polymer, and polymer is very few to will lead to the decline of mechanical fiber optic performance.Separately
Outside, the thickness of chalcogenide glass layer is unsuitable blocked up, to avoid manufacture difficulty.
Embodiment two
Hollow described in a kind of embodiment one pass can mid-infrared light fibre preparation method 200, comprising:
Chalcogenide glass layer is deposited on the surface of first polymer film in step 210, constitutes clad film, wherein the sulphur
It is glass include tellurium element；
Step 220, using pole, wind clad film, and wind second polymer film in the outer surface of clad film,
Obtain covering stick；
Step 230 carries out thermosetting to covering stick, and removes pole, obtains prefabricated rods；
Step 240 is based on wire drawing ratio, carries out drawing wire drawing to prefabricated rods, obtains hollow and passes energy mid-infrared light fibre.
Using this method, above-mentioned periodic structure can be simply and easily realized, wherein adopt vapor deposition method and polymerizeing
The surface of object film coats chalcogenide glass layer, ensure that the uniformity of chalcogenide glass layer.It is drawn using evaporator and special optical fiber
Control equipment can realize being prepared on a large scale for prefabricated rods and optical fiber.
Preferably, the Winding Layer of second polymer film can be 3~30 layers.
Preferably, the thickness of the first polymer film is less than 200 μm；The chalcogenide glass with a thickness of 3~30 μm.
Polymer film thickness can be at 10-200 μm, preferably rectangle, and film length, width under intercepting should be according to steamings
Coating apparatus determines.
The thickness of thin polymer film, to guarantee the adjustability of low-loss band to be transmitted, is deposited no more than 200 μm
The thickness of the chalcogenide glass layer arrived is less than 30 μm, to facilitate the winding of pole.
Preferably, in step 210, the vacuum degree that process is deposited is 10-3Pa magnitude and following.
Chalcogenide glass caused by this method can pollute to avoid water oxygen is rotten, guarantees the quality of periodic structure.
The diameter of air-core is coupled based on the output laser tabula rasa radius and sensor of laser and is determined, and air-core
Diameter it is related with the air pressure of drawing by the diameter of pole.
Preferably, wire drawing ratio is determined based on required transmission optical maser wavelength.
Adjustment band can be reached by adjusting wire drawing ratio (i.e. the ratio between preform diameter and fibre diameter) in drawing process
Gap structure effect realizes the purpose of the adjustment transmission wave band in mid and far infrared wavelength band.
The range of low-loss band depends primarily on the thickness in a covering period.Wire drawing ratio determines a covering period
Thickness, then according to practical band gap (optical fiber transmission wavelength or by covering limit wavelength) need, determine wire drawing ratio, with
The thickness in covering period needed for realizing band gap.
Hollow pass can mid-infrared light fibre core diameter size can by change pole diameter and pulling process in
With air pressure capable of being increased to fibre core to be adjusted, diameter of the rod can should be 20-2000 μm in 0.5-5cm, the cross-sectional diameter of air-core.
During prefabricated stick drawn wire, the protective gas such as argon gas should be filled with to the stove for melting prefabricated rods and carry out gas phase protection.
Related art scheme is as in the first embodiment, details are not described herein.
Preparation method in order to better illustrate the present invention now provides following example:
Example 1 is on 45 μm polyphenylene sulphone resin (Polyphenylene sulfone resins, PPSU) film
One piece of film of long 90cm under cutting, wide 30cm.One layer 20 μm of As is deposited on film by evaporated device40Se40Te20Glass
Glass.As a preferred option, vapor deposition chamber should be kept to be in vacuum state as much as possible during vapor deposition, prevent As40Se40Te20
Water oxygen is touched under glass high temperature to be caused to go bad.
The film that glass has been deposited is prolonged pole to wind up, then winds one layer of PPSU film again in outermost layer.Winding
Fix (fixed form is unlimited) with unsintered tape after the completion, be then placed in thermosetting in tube furnace (in this example thermoset temperature be 230 DEG C,
Thermosetting time 5min, vacuum 10-3Pa or less).By thermosetting it is complete after, remove unsintered tape and pole, obtained prefabricated rods use wire drawing
Tower carries out wire drawing.It should be passed through argon gas in drawing process, in furnace and carry out gas phase protection.
Recognized by emulation, the As within a covering period40Se40Te20The thickness proportion of glass and PPSU film is
When 20:45, when wire drawing ratio (i.e. the ratio between preform diameter and drawing gained fibre diameter) is 73:1, the low of gained fiber is drawn
Wave band centre bit is lost in 3 μm.It is obtained with the hollow that center wave band is 3 μm in this way and passes energy mid-infrared light fibre.Wherein, low damage
The wave band (some frequency range) of consumption, referred to as low-loss band low in the loss of this frequency range inner fiber transmission light.
One piece of film of long 90cm under example 2 is cut on 45 μm of PPSU film, wide 30cm.By evaporated device thin
One layer 20 μm of As is deposited on film40Se40Te20Glass.As a preferred option, vapor deposition chamber should be kept to the greatest extent may be used during vapor deposition
Energy ground is in vacuum state, prevents As40Se40Te20Water oxygen is touched under glass high temperature to be caused to go bad.The thin of glass will be deposited
Film prolongs pole and winds up, and then winds one layer of PPSU film again in outermost layer.It is fixed after the completion of winding with unsintered tape, is then put
Enter thermosetting in tube furnace.By thermosetting it is complete after, remove unsintered tape and pole, obtained prefabricated rods carry out prefabricated rods with wire-drawer-tower
Wire drawing.It should be passed through argon gas in drawing process, in furnace and carry out gas phase protection.
Recognized by emulation, the As within a covering period40Se40Te20When glass and PPSU film ratio are 20:45,
When wire drawing ratio (i.e. the ratio between preform diameter and drawing gained fibre diameter) is 29:1, the low-loss band of gained fiber is drawn
Center is located at 7.6 μm.It is obtained with the hollow that center wave band is 7.6 μm in this way and passes energy mid-infrared light fibre.
One piece of film of long 90cm under example 3 is cut on 45 μm of PPSU film, wide 30cm.By evaporated device thin
One layer 20 μm of As is deposited on film40Se40Te20Glass.As a preferred option, vapor deposition chamber should be kept to the greatest extent may be used during vapor deposition
Energy ground is in vacuum state, prevents As40Se40Te20Water oxygen is touched under glass high temperature to be caused to go bad.The thin of glass will be deposited
Film prolongs pole and winds up, and then winds one layer of PPSU film again in outermost layer.It is fixed after the completion of winding with unsintered tape, is then put
Enter thermosetting in tube furnace.By thermosetting it is complete after, remove unsintered tape and pole, obtained prefabricated rods carry out prefabricated rods with wire-drawer-tower
Wire drawing.It should be passed through argon gas in drawing process, in furnace and carry out gas phase protection.
Recognized by emulation, the As within a covering period40Se40Te20When glass and PPSU film ratio are 20:45,
When wire drawing ratio (i.e. the ratio between preform diameter and drawing gained fibre diameter) is 21:1, the low-loss band of gained fiber is drawn
10.3 μm of centre bit.It is obtained with the hollow that center wave band is 10.4 μm in this way and passes energy mid-infrared light fibre.
One piece of film of long 90cm under example 4 is cut on 45 μm of PPSU film, wide 30cm.By evaporated device thin
One layer 20 μm of As is deposited on film40Se40Te20Glass.As a preferred option, vapor deposition chamber should be kept to the greatest extent may be used during vapor deposition
Energy ground is in vacuum state, prevents As40Se40Te20Water oxygen is touched under glass high temperature to be caused to go bad.The thin of glass will be deposited
Film prolongs pole and winds up, and then winds one layer of PPSU film again in outermost layer.It is fixed after the completion of winding with unsintered tape, is then put
Enter thermosetting in tube furnace.By thermosetting it is complete after, remove unsintered tape and pole, obtained prefabricated rods carry out prefabricated rods with wire-drawer-tower
Wire drawing.It should be passed through argon gas in drawing process, in furnace and carry out gas phase protection.
Recognized by emulation, the As within a covering period40Se40Te20When glass and PPSU film ratio are 20:45,
When wire drawing ratio (i.e. the ratio between preform diameter and drawing gained fibre diameter) is 10:1, the low-loss band of gained fiber is drawn
Center is located at 20 μm.It is obtained with the hollow that center wave band is 20 μm in this way and passes energy mid-infrared light fibre.
One piece of film of long 90cm under example 5 is cut on 45 μm of PPSU film, wide 30cm.By evaporated device thin
One layer 15 μm of As is deposited on film30Se50Te20Glass.As a preferred option, vapor deposition chamber should be kept to the greatest extent may be used during vapor deposition
It can be in vacuum state, prevent As30Se50Te20Water oxygen is contacted under glass high temperature to be caused to go bad.The film that glass has been deposited is prolonged
Pole is wound up, and is then wound one layer of PPSU film again in outermost layer, is fixed after the completion of winding with unsintered tape, be then placed in pipe
Thermosetting in formula furnace.By thermosetting it is complete after, remove unsintered tape and pole, obtained prefabricated rods carry out wire drawing with wire-drawer-tower to prefabricated rods.
It should be passed through argon gas in drawing process, in furnace and carry out gas phase protection.
Recognized by emulation, the As within a covering period30Se50Te20When glass and PPSU film ratio are 20:45,
When wire drawing ratio (i.e. the ratio between preform diameter and drawing gained fibre diameter) is 24:1, the low-loss band of gained fiber is drawn
Center is in 10.3 μm.It is obtained with the hollow that center wave band is 10.3 μm in this way and passes energy mid-infrared light fibre.
Due to above-mentioned first four example (there is same glass material), mainly change wire drawing ratio, wire drawing ratio master
The thickness of a cycle structure is influenced, therefore, is indicated shown in the available Fig. 3 of the corresponding bandgap structure of obtained optical fiber, Fig. 3
In, a represents the overall thickness in a covering period, and pi is π value, and c is the light velocity.From the figure, it can be seen that due to periodic structure,
When normalized radian frequency is between 0.25-0.3, a part, which normalizes the light wave that longitudinal wave vector is 0-0.3, can not pass through covering
Periodic structure, this part light will also constrain in fibre core by photonic band gap structure.Due to example 5, changing sulphur system glass
After glass material mixture ratio, as long as accordingly therefore change drawing ratio and evaporation thickness also can produce identical effect.Likewise,
The corresponding bandgap structure of the optical fiber that above-mentioned example 5 obtains can indicate shown in Fig. 4, can be seen that from Fig. 3 and Fig. 4, different glass material
It is different that material obtains optical fiber transmission wave band.
It should be noted that angular frequency is normalized, that is to say, that angular frequency is a on the basis of maximum angular frequency
Smaller, maximum angular frequency is also bigger, and center wave band will also change, so four exemplary center wave bands are different.
To sum up, what embodiment one and embodiment two provided can pass with the matched hollow of QCL laser can mid-infrared light it is fine and
Preparation method, by the periodic structure of polymer-sulfur system two kinds of materials of glass interaction, and by rationally designing, by low damage
Consumption wave band moves to the service band of QCL laser.(change in addition, hollow passes energy mid-infrared light fibre and designed by flexible structure
Wire drawing ratio is to change cladding thickness) with material selection, it can be achieved that optical transport wave band adjustable extent covers entire mid and far infrared wave
Section, the i.e. service band (3-20 μm) of QCL laser.Since optical fiber is hollow-core fiber, low-loss wave-length coverage is covered in entire
Far infrared band can carry out targeted design to mid-infrared laser use environment for various purposes.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of hollow passes, energy mid-infrared light is fine, and the laser applied to quantum cascade laser transmits, which is characterized in that in hollow
Tubulose, comprising: fibre cladding and its interior air-core, and it is set to the fiber polymer of the outer surface of the fibre cladding
Protective layer；
Wherein, the fibre cladding includes the chalcogenide glass layer and polymeric layer of alternate intervals arrangement, the chalcogenide glass layer
It include tellurium element in material.
2. it is fine that a kind of hollow according to claim 1 passes energy mid-infrared light, which is characterized in that the air-core is by described
The boundary of chalcogenide glass layer determines.
3. it is fine that a kind of hollow according to claim 1 passes energy mid-infrared light, which is characterized in that the chalcogenide glass layer is corresponding
Chalcogenide glass material refractive index polymer material corresponding with the polymeric layer refractive index difference be greater than 0.5.
4. it is fine that a kind of hollow according to any one of claims 1 to 3 passes energy mid-infrared light, which is characterized in that a covering
The overall thickness in period is determined based on actually required transmission optical maser wavelength, wherein a covering period is by one layer of adjacent institute
It states chalcogenide glass layer and one layer of polymeric layer is constituted.
5. it is fine that a kind of hollow according to claim 4 passes energy mid-infrared light, which is characterized in that the periodicity in the covering
Greater than 5.
6. it is fine that a kind of hollow according to claim 4 passes energy mid-infrared light, which is characterized in that the chalcogenide glass layer and institute
Stating the ratio between thickness of polymeric layer is 1:7-2:1.
7. a kind of preparation method for passing energy mid-infrared light fibre such as hollow as claimed in any one of claims 1 to 6, which is characterized in that
Include:
One layer of chalcogenide glass is deposited on the surface of first polymer film in step 1, constitutes clad film, wherein sulphur system glass
Glass includes tellurium element；
Step 2, using pole, wind the clad film, and thin in the outer surface of clad film winding second polymer
Film obtains covering stick；
Step 3 carries out thermosetting to the covering stick, and removes the pole, obtains prefabricated rods；
Step 4 is based on wire drawing ratio, carries out drawing wire drawing to the prefabricated rods, obtains the hollow and passes energy mid-infrared light fibre.
8. a kind of preparation method according to claim 7, which is characterized in that the thickness of the first polymer film is less than
200μm；The chalcogenide glass with a thickness of 2-30 μm.
9. a kind of preparation method according to claim 7, which is characterized in that in the step 1, the vapor deposition process it is true
Reciprocal of duty cycle is 10-3Pa magnitude and following.
10. a kind of preparation method according to any one of claims 7 to 9, which is characterized in that the wire drawing ratio is based on institute
Optical maser wavelength need to be transmitted to determine.
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| CN111399110A (en) * | 2020-03-02 | 2020-07-10 | 华中科技大学 | Multifunctional optical fiber and preparation method thereof |
| CN111647969A (en) * | 2020-06-10 | 2020-09-11 | 北京环境特性研究所 | Composite fiber |
| WO2021175170A1 (en) * | 2020-03-02 | 2021-09-10 | 华中科技大学 | Multiband transmission optical fiber and preparation method therefor |
| CN117310871A (en) * | 2023-08-28 | 2023-12-29 | 江苏师范大学 | Chalcogenide glass optical fiber monofilament and application thereof in preparation of long-wave infrared optical fiber image transmission beam |
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