CN104865634B - A kind of Yb dosed optical fiber and preparation method thereof - Google Patents
A kind of Yb dosed optical fiber and preparation method thereof Download PDFInfo
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- CN104865634B CN104865634B CN201510318829.0A CN201510318829A CN104865634B CN 104865634 B CN104865634 B CN 104865634B CN 201510318829 A CN201510318829 A CN 201510318829A CN 104865634 B CN104865634 B CN 104865634B
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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
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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
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
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Abstract
The invention discloses a kind of Yb dosed optical fibers and preparation method thereof, has at least sandwich layer containing ytterbium Yb and aluminium Al and around the glass matrix covering of the sandwich layer, and the low-refraction coat around the glass matrix covering, the glass matrix covering includes inner cladding and surrounding layer, wherein the inner cladding refractive index is higher than surrounding layer less than sandwich layer.Inner cladding using Ge, P, Al, F be used as dopant, sandwich layer adulterate F, P be used as dopant, using MCVD methods prepare prefabricated rods, control wire-drawing temperature make optical fiber in compared with low-tension pull down silk obtain required optical fiber.By the refractive index for improving inner cladding, relatively pass through the difference of reduction sandwich layer and inner cladding refractive index, it can maintain higher Al, Yb doping concentration in fibre core, to in the case where maintaining higher fibre cladding absorption coefficient, sandwich layer NA is reduced, realizes single-mode output, that is, optical fiber quality factor close to 1.The present invention can manufacture high concentration Yb dosed optical fiber, realize higher covering absorption coefficient.
Description
Technical field
The invention belongs to optic fibre manufacturing technology fields, more particularly, to a kind of Yb dosed optical fiber and preparation method thereof.
Background technology
Rare earth element is added in the core area of optical fiber and forms rare earth doped fiber, there is optical amplification function, can be applied to
In the light sources such as laser, image intensifer and Transmission system.Wherein ytterbium is mixed using the optical fiber containing rare earth element ytterbium (Yb)
The optical fiber laser of optical fiber fabrication, beam quality is good, high-power output light can be obtained, and the optical fiber laser exports
The oscillation wavelength of light and the Nd-YAG lasers of one of existing superpower laser are essentially identical, near 1 μm.Therefore, Yb is mixed
Laser inherit the materials such as welding, label, the cutting of conventional laser processing purposes.
The process for preparing Yb dosed optical fiber is mainly liquid phase doping methods and gas phase doping method.Liquid phase doping methods are to prepare to mix
The process that ytterbium optical fiber uses earliest, and the current method generally used in the world.It is being reacted by MCVD techniques
Inside pipe wall deposits the quartz glass deposition layer of short texture, and this sedimentary is immersed in the solution containing rare earth ion, is made
Then rare earth ion in sedimentary adsorbent solution mixes rare earth ion into reaction tube using techniques such as dehydration, vitrifyings
In.
High performance Yb dosed optical fiber in order to obtain, it is necessary to improve Yb doping concentrations, inhale pump light to improve Yb optical fiber
The ability for being converted into signal light is received, aluminium (Al) plays an important role the raising of Yb concentration as agent is co-doped with, however Al concentration
Raising can also increase the refractive index of optical fiber simultaneously, to obtain the Yb optical fiber of single-mode output, fiber core layer refractive index just has one
Fixed limitation, therefore how to improve the doping concentration of Al and keep the unimodular property of optical fiber, it is one of Yb optical fiber fabrication technologies research
Important topic.
It discloses by by aluminium oxide (Al2O3) and phosphorus pentoxide (P2O5) be jointly added to by silica glass
(SiO2) constitute masterbatch in, the refractive index of core can be inhibited to rise.The addition concentration (mol%) of aluminium oxide and phosphorus pentoxide
Closer to equivalent, then closer to the refractive index of pure silica.The preparation method of above-mentioned Yb dosed optical fiber is for improving Yb doping
Concentration has certain effect, but there is also deficiencies.Phosphorus pentoxides are adulterated as a large amount of, since phosphorus pentoxide volatilizees at high temperature
Seriously, it is easy to form the central concave of refractive index profile and the offset of optical fiber actual refractive index during making prefabricated rods.
Invention content
To overcome the shortcomings of that the high concentration of Yb dosed optical fiber is difficult to take into account with unimodular property in the prior art, the present invention to be solved
Certainly the technical issues of be to provide it is a kind of can keep the triple clad high concentration Yb dosed optical fiber of single-mode output, and accurately control folding
Penetrate the Yb dosed optical fiber prefabricated rods of rate section and the manufacturing method of optical fiber.
The present invention uses following technical scheme to achieve the above object：
The Yb dosed optical fiber of the present invention has the sandwich layer at least containing Yb and Al and the glass matrix covering around the sandwich layer, with
And the low-refraction coat around the glass matrix covering, the glass matrix covering include inner cladding and surrounding layer, wherein
The inner cladding refractive index is higher than surrounding layer less than sandwich layer.
Preferably, the inner cladding and cladding refractive index difference are 0~0.1%.
Preferably, the diameter ratio of the inner cladding and sandwich layer is 1~10.
Preferably, the glass matrix covering can be quartz glass substrate matter covering.
Preferably, a diameter of 80 μm~600 μm of the glass overclad of the Yb dosed optical fiber, a diameter of 4 μm~50 μm of sandwich layer.
Cladding refractive index is 1.4546~1.4575 (testing laser wavelength is 670nm), and core refractive rate and inner cladding refractive index are poor
It is 0.05 to 0.2 for 0.06%~0.95%, NA ranges.
It is further preferred that the NA ranges of the optical fiber are 0.065 to 0.075.
Preferably, the Yb dosed optical fiber, sandwich layer is in addition to Yb, except Al, also doped with fluorine F and/or phosphorus P, F dopant
For reducing the refractive index of sandwich layer, and P is used to neutralize the Al in sandwich layer, and effect is also to reduce the refractive index of sandwich layer, the doping of P
Amount can also be more than Al (being calculated with P element and Al element molar concentrations), be contributed by P to the refractive index of sandwich layer, and original
Al then plays the role of reducing the refractive index that P is provided.Its sandwich layer adulterate Yb elements molar content be 0.01mol%~
1.5mol%, doping Al elements molar content be 0.1mol%~5mol%, doping F elements molar content be 0mol%~
2mol%, the molar content for adulterating P element are 0mol%~13mol%.
Preferably, the Yb dosed optical fiber, glass inner cladding host material are SiO2, dopant material at least contain Ge,
F, one or more in Al, P.The effect of Ge, Al, P are to improve the refractive index of inner cladding, and the effect of F doping is to reduce packet
Layer refractive index.The molar content that the glass inner cladding adulterates Ge elements is 0.01mol%~1.5mol%, and doping F elements rub
Your content is 0.1mol%~1mol%, and the molar content of doping Al elements is 0.1mol%~1mol%, adulterates rubbing for P element
Your content is 0mol%~2.5mol%.
Preferably, the sandwich layer coefficient of thermal expansion of the Yb dosed optical fiber is 5.78~5.85 × 10-7/ DEG C, the heat of inner cladding is swollen
Swollen coefficient is 5.56~5.64 × 10-7/℃.The two and the quartz glass matrix of surrounding layer form coefficient of thermal expansion gradient, alleviate
With disperseed to remain in the stress in fiber cores area, improve high-temperature stability of the optical fiber when transmitting high power laser light.
Preferably, the absorption coefficient of the Yb dosed optical fiber is greater than or equal to 3.2dB/ when laser testing wavelength is 915nm
M, the beam quality factor M of the optical fiber2Less than or equal to 1.3.
Correspondingly, the present invention also provides a kind of production methods of above-mentioned Yb dosed optical fiber, wherein the packet of the Yb dosed optical fiber
The manufacturing method of layer is using deposition substrate material and dopant material in PCVD or MCVD pipes, and the manufacturing method of sandwich layer is to use
Solwution method or vapor deposition method can be used in MCVD deposition substrates material and dopant material, MCVD manufacturing methods used；It is described
Yb dosed optical fiber, prefabricated rods are in drawing process, using the low-tension wire drawing of 20-70g, with ensure between sandwich layer and inner cladding compared with
Low refractive index difference.
The actual effect of inside and outside cladding structure design is, by improving the refractive index of inner cladding, relatively by reducing core
The difference of layer and inner cladding refractive index, can maintain higher Al, Yb doping concentration in fibre core, to maintain higher optical fiber packet
In the case of layer absorption coefficient, sandwich layer NA is reduced, realizes single-mode output, that is, optical fiber quality factor close to 1；In other words, it is not
In the case of changing sandwich layer NA, increase Al, Yb concentration of fibre core doping, realizes that higher covering absorbs.
Description of the drawings
Fig. 1 is the fibre profile schematic diagram and Refractive Index Profile of Optical schematic diagram of patent of the present invention, wherein n1And d1It is core
The refractive index and diameter of layer, n2And d2It is the refractive index and diameter of glass inner cladding, n3And d3Be glass overclad refractive index and
Diameter, n4And d4It is the refractive index and diameter of low-refraction coat；
Fig. 2 is the preform field section figure of patent of the present invention, wherein 1 is core segment, 2 be inner cladding segment, 3
It is outsourcing layer segment.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be 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
It does not constitute a conflict with each other and can be combined with each other.
It is of the invention in order to facilitate understanding, it is first that technical term centralized definition of the present invention is as follows：
MCVD：Modified Chemical Vapour Deposition, improved chemical vapor deposition method.
PCVD：Plasma activated Chemical Vapour Deposition, plasma chemical vapor deposition side
Method.
Refractive index profile：Relation curve between preform and the refractive index and its radius of optical fiber.
NA：Numerical Aperture, numerical aperture, expression formula aren2And n1In respectively
The refractive index of covering and sandwich layer.
Beam quality factor M2：Its definition is,Wherein, R is the waist radius of actual light beam, R0For
The waist radius of fundamental-mode gaussian beam, θ are the far-field divergence angle of actual light beam, θ0For the far-field divergence angle of fundamental-mode gaussian beam,
When beam quality factor is 1, there is best beam quality.
As shown in Figure 1, for the fibre profile schematic diagram and Refractive Index Profile of Optical schematic diagram of Yb dosed optical fiber of the present invention, institute
It states Yb dosed optical fiber and has the sandwich layer at least containing Yb and Al and the glass matrix covering around the sandwich layer, and surround the glass base
The low-refraction coat of matter covering, the glass matrix covering includes inner cladding and surrounding layer, wherein the inner cladding reflects
Rate is higher than surrounding layer less than sandwich layer.As shown in Figure 1, the structure of the Yb dosed optical fiber has 4 layers, from inside to outside respectively sandwich layer,
The internal layer of glass matrix covering, the outer layer of glass matrix covering and low-refraction coat, wherein n1And d1It is the refraction of sandwich layer
Rate and diameter, n2And d2It is the refractive index and diameter of inner cladding, n3And d3It is the refractive index and diameter of surrounding layer, n4And d4It is low folding
Penetrate the refractive index and diameter of rate coat；As seen from the figure, the sandwich layer, the internal layer of glass matrix covering, glass matrix packet
The outer layer of layer and the refractive index of coat reduce successively.
If Fig. 2 is the preform field section figure of Yb dosed optical fiber provided by the present invention, wherein 1 is core segment, 2
It is inner cladding segment, 3 be outsourcing layer segment.
Illustrate Yb dosed optical fiber of the present invention and its manufacturing method with reference to specific embodiment：
Embodiment one：By the pure quartz glass that specification is 31mm (pipe outside diameter) * 1.8mm (tube thickness) * 600mm (length of tube)
Bushing pipe is fixed on MCVD lathes, and pure silicon surrounding layer is deposited according to designing, 1780 DEG C, oxygen flow 1000sccm of depositing temperature,
Silicon tetrachloride flow 400sccm, sedimentary inner envoloping layer after the completion of outer cladding deposition, depositing temperature are 1800 DEG C, oxygen flow
1000sccm, silicon tetrachloride flow are 300sccm, and germanium chloride flow is 20sccm, and freon flow is 5sccm, is then deposited
The loose and porous structure of sandwich layer, 1400 DEG C, oxygen flow 800sccm, silicon tetrachloride flow 200sccm of depositing temperature, trichlorine oxygen
Phosphorus flow 100sccm removes bushing pipe after completing deposition, prepared Al, Yb solution is poured into bushing pipe and is impregnated 4 hours, wherein
Concentration of aluminum chloride 0.55mol/L, ytterbium chloride concentration 0.1mol/L, complete impregnate after bushing pipe on MCVD lathes collapsing at prefabricated
Stick, 2300 DEG C of collapsing temperature.Cylindrical prefabricated rods after the completion are polished into octagon, 40g tension is used on wire-drawer-tower,
The wire drawing of 100m/min speed is at 10 μm of core diameter, 40 μm of inner cladding diameter, the Yb dosed optical fiber that 130 μm of fibre diameter.The optical fiber is surveyed
Test result is NA=0.073, and interior glass-clad differs 0.05% with outer glass-clad refringence, fiber absorption coefficient 3.2dB/
M (laser testing wavelength is 915nm), beam quality factor M2=1.2.
Embodiment two：By the pure quartz glass that specification is 31mm (pipe outside diameter) * 1.8mm (tube thickness) * 600mm (length of tube)
Bushing pipe is fixed on MCVD lathes, and pure silicon surrounding layer is deposited according to designing, 1780 DEG C, oxygen flow 1000sccm of depositing temperature,
Silicon tetrachloride flow 400sccm, sedimentary inner envoloping layer after the completion of outer cladding deposition, depositing temperature are 1790 DEG C, oxygen flow
1000sccm, silicon tetrachloride flow are 300sccm, and freon flow is 10sccm, then phosphorus oxychloride flow 30sccm is deposited
The loose and porous structure of sandwich layer, 1400 DEG C, oxygen flow 800sccm, silicon tetrachloride flow 200sccm of depositing temperature, trichlorine oxygen
Phosphorus flow 70sccm removes bushing pipe after completing deposition, prepared Al, Yb solution is poured into and impregnates 4 hours, wherein chlorine in bushing pipe
Change aluminum concentration 0.65mol/L, ytterbium chloride concentration 0.12mol/L, complete impregnate after bushing pipe on MCVD lathes collapsing at prefabricated
Stick, 2250 DEG C of collapsing temperature.Cylindrical prefabricated rods after the completion are polished into D fonts, 20g tension is used on wire-drawer-tower,
The wire drawing of 80m/min speed is at 25 μm of core diameter, 100 μm of inner cladding diameter, the Yb dosed optical fiber that 250 μm of fibre diameter.The optical fiber is surveyed
Test result is NA=0.065, interior glass-clad and outer glass-clad refringence 0.09%, fiber absorption coefficient 3.9dB/m (@
915nm), beam quality factor M2=1.25.
Embodiment three：By the pure quartz glass that specification is 31mm (pipe outside diameter) * 1.8mm (tube thickness) * 600mm (length of tube)
Bushing pipe is fixed on MCVD lathes, and pure silicon surrounding layer is deposited according to designing, 1780 DEG C, oxygen flow 1000sccm of depositing temperature,
Silicon tetrachloride flow 400sccm, sedimentary inner envoloping layer after the completion of outer cladding deposition, depositing temperature are 1800 DEG C, oxygen flow
1000sccm, silicon tetrachloride flow are 300sccm, and germanium chloride flow is 15sccm, and freon flow is 5sccm, is then used
The core structure of vapor phase method deposit glass, 1900 DEG C, oxygen flow 800sccm of depositing temperature, silicon tetrachloride flow
100sccm, chlorination aluminum flux 100sccm, ytterbium chloride flow 100sccm, phosphorus oxychloride flow 50sccm, freon flow
20sccm, collapsing is at prefabricated rods, 2300 DEG C of collapsing temperature after the completion of sandwich layer deposits.Cylindrical prefabricated rods after the completion are polished into
Octagon uses 70g tension on wire-drawer-tower, and the wire drawing of 120m/min speed is at 20 μm of core diameter, 70 μm of inner cladding diameter, optical fiber
The Yb dosed optical fiber that 130 μm of diameter.The test optical fiber result is NA=0.075, interior glass-clad and outer glass-clad refringence
Difference 0.04%, fiber absorption coefficient 4.7dB/m (@915nm), beam quality factor M2=1.3.
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, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of Yb dosed optical fiber, which is characterized in that have at least sandwich layer containing ytterbium Yb and aluminium Al and around the glass of the sandwich layer
Matrix blanket, and around the low-refraction coat of the glass matrix covering, the glass matrix covering include inner cladding and
Surrounding layer, wherein the inner cladding refractive index is higher than surrounding layer less than sandwich layer, the difference of the inner cladding and cladding refractive index
Value is 0~0.1%, and the difference of the core refractive rate and inner cladding refractive index is 0.06%~0.95%, the number of the optical fiber
Value aperture NA ranges are 0.05 to 0.2, and the NA ranges of the optical fiber are 0.065 to 0.075, the diameter of the inner cladding and sandwich layer
The ratio between be 1~10；
The sandwich layer is other than Yb and Al, and also doped with F and/or P, the molar content of sandwich layer doping Yb elements is
The molar content of 0.01mol%~1.5mol%, doping Al elements are 0.1mol%~5mol%, and doping F elements mole contain
Amount is 0mol%~2mol%, and the molar content for adulterating P element is 0mol%~13mol%；
The dopant material of the inner cladding glass matrix is at least containing one or more in Ge, F, Al, P, inner cladding doping
The molar content of Ge elements is 0.01mol%~1.5mol%, and the molar content of doping F elements is 0.1mol%~1mol%,
The molar content for adulterating Al elements is 0.1mol%~1mol%, and the molar content for adulterating P element is 0mol%~2.5mol%.
2. Yb dosed optical fiber as described in claim 1, which is characterized in that the surrounding layer testing laser wavelength be 670nm when,
Refractive index is 1.4546~1.4575.
3. Yb dosed optical fiber as described in claim 1, which is characterized in that the outer cladding diameter is 80 μm~600 μm, and sandwich layer is straight
Diameter is 4 μm~50 μm.
4. Yb dosed optical fiber as described in claim 1, which is characterized in that the sandwich layer coefficient of thermal expansion is 5.78~5.85 × 10-7/ DEG C, the coefficient of thermal expansion of inner cladding is 5.56~5.64 × 10-7/℃。
5. Yb dosed optical fiber as described in claim 1, which is characterized in that the absorption coefficient of the Yb dosed optical fiber is in laser testing wave
When a length of 915nm, it is greater than or equal to 3.2dB/m, the beam quality factor M of the optical fiber2Less than or equal to 1.3.
6. the manufacturing method of the Yb dosed optical fiber as described in any one of claim 1-5, which is characterized in that the Yb dosed optical fiber
Covering is using deposit manufacture host material and dopant material in PCVD or MCVD method pipes, and sandwich layer uses MCVD deposition substrate materials
Material and dopant material, the MCVD manufacturing methods are solwution method or vapor deposition method；The prefabricated rods of the Yb dosed optical fiber exist
In drawing process, using the low-tension wire drawing of 20-70g.
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| CN101796697A (en) * | 2007-07-16 | 2010-08-04 | 科拉克蒂夫高科技公司 | Luminescent device with phosphosilicate glass |
| JP2010001193A (en) * | 2008-06-20 | 2010-01-07 | Fujikura Ltd | Method for manufacturing optical fiber preform |
| CN102144341A (en) * | 2009-06-17 | 2011-08-03 | 株式会社藤仓 | Multiclad optical fiber, optical fiber module, fiber laser, and fiber amplifier |
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