CN208805590U - A kind of large mode field mixes ytterbium Active Optical Fiber - Google Patents
A kind of large mode field mixes ytterbium Active Optical Fiber Download PDFInfo
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Abstract
The utility model relates to a kind of large mode fields to mix ytterbium Active Optical Fiber, it is characterized in that it is successively made of the first sandwich layer, the second sandwich layer, the first inner cladding, the second inner cladding, surrounding layer and protective layer from inside to outside.The utility model has the advantages that big mode field area and can obtain high light beam quality by bending modeling method.
Description
Technical field
Ytterbium Active Optical Fiber is mixed the utility model relates to one kind more particularly to a kind of mixes ytterbium active light with big mode field area
It is fine.
Background technique
Ytterbium Active Optical Fiber laser is mixed due to small in size, good heat dissipation and stability height, good beam quality, Slop efficiency height etc.
Significant advantage gradually becomes the leading force in industrial laser industry, and always by field scholar, technical staff
Concern.Wherein ytterbium active light is mixed as the large mode field for mixing essential elements in ytterbium Active Optical Fiber laser, structure and ingredient
Design most important to the performance of optical fiber laser, existing large mode field mixes ytterbium active light its structure from inside to outside successively by core
Layer, inner cladding, surrounding layer and protective layer composition.
With the continuous promotion for mixing ytterbium Active Optical Fiber laser power, it is desirable that mix ytterbium Active Optical Fiber sandwich layer has with bigger
Imitate area, better beam quality.CN1052447A provides a kind of fiber composition structure design for changing and mixing ytterbium ion concentration
Scheme, it is 15 μm that its mode field diameter of ytterbium Active Optical Fiber is mixed in 20/400 finally obtained, beam quality 1.8.In actual production system
During standby, often bigger effective area will lead to the increase of fiber core layer diameter, and then improve the cutoff wavelength of optical fiber.
Under the premise of not reducing fiber numerical aperture, Active Optical Fiber is made to generate more high-order modes, light beam matter on identical wave band
It measures worse.And on the other hand, the single mode for mixing ytterbium Active Optical Fiber can also be kept to operate by the method for reducing numerical aperture, still
It is limited by material is intrinsic, numerical aperture is difficult to be reduced to 0.05 hereinafter, too low numerical aperture will increase and mix ytterbium simultaneously
The bending loss of optical fiber makes to leak into covering in the laser of sandwich layer.
Existing technology yb-doped double-clad fiber core refractive rate is distributed as simple step type, and this Stepped-index is set
When sandwich layer is greater than or equal to 20 μm and numerical aperture 0.06 in meter, few mould transmission can be carried out, there are still certain high-order modes
It transmits in the core, to influence the beam quality of final optical fiber laser, at present there is several methods that high power may be implemented is big
The single mode of mode field area Yb-doped Active Optical Fiber operates, and first kind method is fiber filters technology.When fibre-optical bending to a certain extent
When, optical fiber at radiation is generated loss by optical fiber internal schema, and bending loss can increase with the increase of mode order, utilizes this
The difference of kind basic mode and high-order mode bending loss can filter out high-order mode, to realize that few mould even basic mode transmits.Second class is
Using other special optical fibers such as photonic crystal fiber, mode upconversion fiber, high-order mode fiber, chirality coupling optical fiber etc..
In above-mentioned several optical fiber that can be realized the operating of big mode field area single mode, bending method filter membrane is more common side
Method, but this method is limited to small core optical fibers, it is larger or when numerical aperture is lower once sandwich layer, between high-order mode and basic mode
Bending loss difference reduce, lead to the reduction of filter membrane efficiency.And on the other hand in order to improve the effective area of Active Optical Fiber, increase
Concrete-cored layer diameter, reducing numerical aperture is then most effective direct method, makes optical fiber while how improving mode field diameter thus
Have the novel large mode field that higher numerical aperture is the utility model design and mixes the problem of ytterbium Active Optical Fiber is solved.
Summary of the invention
For disadvantage mentioned above, there is big mode field area the purpose of this utility model is to provide one kind and can be selected by bending
The large mode field that modulus method obtains high light beam quality mixes ytterbium Active Optical Fiber.
The technology contents of the utility model are, a kind of large mode field mixes ytterbium Active Optical Fiber, it is characterized in that it is from inside to outside successively
It is made of the first sandwich layer, the second sandwich layer, the first inner cladding, the second inner cladding, surrounding layer and protective layer, wherein
Main component is silica in first sandwich layer, and adulterates the element of following molar percentage: wherein aluminium: 1~6,
Ytterbium: 0.1~0.6, phosphorus: 1~4, cerium: 0~1, fluorine: 0.1~0.5；
Main component is silica in second sandwich layer, and adulterates the element of following molar percentage: wherein aluminium: 1~6,
Ytterbium: 0.1~0.6, phosphorus: 1~4, cerium: 0~1；
First inner cladding main component be silica, and doped with molar percentage be 0.1~0.5 fluorine element；
Second inner cladding main component is silica；
The outside of second inner cladding is octagon,
The radius r of first sandwich layer1It is 1~10 μm, the radius r of the second sandwich layer2It is 5~50 μm, wherein the first core radius
r1With the second core radius r2The ratio between be 0.1~0.3；First inner cladding diameter r3With the second core radius r2Difference be 0.2~1
μm；The inscribed circle radius r of any two opposite side of second inner cladding octagon4It is 60~400 μm；
The refringence △ n of first sandwich layer and the second inner cladding1It is 0.07~0.15%；Second sandwich layer and the second inner cladding
Refringence △ n2It is 0.08~0.16%, and △ n2≥△n1；The refringence △ n of first inner cladding and the second inner cladding3
It is -0.02~-0.01%.
It is mixed in ytterbium Active Optical Fiber in above-mentioned large mode field:
The radius of first sandwich layer is r1, refractive index n1；
The radius of second sandwich layer is r2, refractive index n2；
The radius of first inner cladding is r3, refractive index n3；
The outside of second inner cladding is octagon, and edge-to-edge's inscribed circle radius is r4, refractive index n4；
The radius of surrounding layer is r5, refractive index n5；
The radius of protective layer is r6, refractive index n6；
△n1: for the refringence of the first sandwich layer and the second inner cladding, definition are as follows: △ n1=(n1-n4)/n4；
△n2: the refringence of the second sandwich layer and the second inner cladding, definition are as follows: △ n2=(n2-n4)/n4；
△n3: the refringence of the first inner cladding and the second inner cladding, definition are as follows: △ n3=(n3-n4)/n4。
It is mixed in ytterbium Active Optical Fiber in above-mentioned large mode field, compared with the first sandwich layer, undope in the second sandwich layer has the second sandwich layer
Fluorine element；
Doped with fluorine element compared with the second inner cladding, the second inner cladding undopes and has fluorine element first inner cladding.
The numerical aperture that the large mode field of the utility model mixes the second inner cladding in ytterbium Active Optical Fiber is greater than or equal to 0.46；Make
With the refractive index that wavelength is the second covering of 670nm laser testing 1.4570~1.4573.
Above-mentioned large mode field involved in the utility model mixes the preparation method of ytterbium Active Optical Fiber and is, a kind of large mode field, which mixes ytterbium, to be had
The preparation method of source optical fiber comprising following steps:
(1), base tube pre-processes, and base tube is preheated to and effectively eliminated the impurity and bubble of base tube inner wall；
(2), will be processed that base tube deposit mixed with the first inner cladding of fluorine, the flow of fluorine is 0.1~5sccm, is sunk
Lamination number is 2~5 layers；
(3), the post-depositional base tube of the first inner cladding in step (2) is passed through SiCl at 1500~1650 DEG C4Gas carries out
Silica loosening body deposition, SiCl4The volume flow being passed through is 100~300sccm, cuts the tail pipe of base tube after deposition
It is disconnected, it is then immersed in impregnate and be impregnated 0.2~1 hour in aqueous solution, be passed through N after immersion in base tube2Silica is dried up to dredge
Moisture in loose body layer impregnates in aqueous solution and contains AlCl3、YbCl3、CeCl3And H3PO4, AlCl3Molar concentration be 0.01~
0.5 %, YbCl3Molar concentration be 0.01~0.5 %, CeCl3Molar concentration be 0.01~0.5 %, H3PO4It is mole dense
Degree is 0.01~0.5 %；
(4), the base tube after step (3) drying is connected into tail pipe again again, is then first passed through O at 850~950 DEG C2To base
Aluminium, ytterbium, cerium and the phosphorus of silica loosening body in pipe are aoxidized, O2The time being passed through is 30~60 minutes, O2The body being passed through
Product flow is 150~180sccm；Then it is passed through Cl again2Silica loosening body layer in base tube is dried, Cl2It is passed through
Time is 30~60 minutes, Cl2The volume flow being passed through is 100~150sccm；Silica is dredged at 1600~2000 DEG C again
Loose body layer sinters sandwich layer into；
(5), the second sandwich layer is obtained after repeating step (3) and step (4) 2~5 times；
(6), the post-depositional base tube of the second sandwich layer in step (5) is passed through SiCl at 1500~1650 DEG C4Gas carries out two
Silica loosening body deposition, SiCl4The volume flow being passed through is 100~300sccm, cuts the tail pipe of base tube after deposition
It is disconnected, it is then immersed in and is impregnated 0.2~1 hour with identical immersion aqueous solution in step (3), is passed through in base tube after immersion
N2Dry up the moisture in silica loosening body layer；
(7), the base tube after step (6) drying is connected into tail pipe again again, is then first passed through O at 850~950 DEG C2To base
Aluminium, ytterbium, cerium and the phosphorus of silica loosening body in pipe are aoxidized, O2The time being passed through is 30~60 minutes, O2The body being passed through
Product flow is 150~180sccm；Then it is passed through Cl again2Silica loosening body layer in base tube is dried, Cl2It is passed through
Time is 30~60 minutes, Cl2The volume flow being passed through is 100~150sccm；Silica is dredged at 1600~2000 DEG C again
Loose body layer sinters the first sandwich layer into, is passed through sulfur hexafluoride gas, the volume flow that sulfur hexafluoride gas is passed through while sintering
For 0.1~5sccm；
(8), the base tube of the first sandwich layer collapses in 2100~2200 DEG C of progress forward directions and reversely sintering in step (7),
Obtained large mode field mixes ytterbium Active Optical Fiber prefabricated rods；
(9), polish simultaneously casing to preform, octagon will be worn into outside casing；Then by the predispersed fiber
Stick processed draws and attenuates into silica fibre；
(10), one layer of low-refraction coating is first coated outside silica fibre obtained in step (9), at ultra-violet curing
Reason forms surrounding layer, is then coated with one layer of acrylic resin optical fiber coatings, forms protective layer by ultra-violet curing processing, thus
Large mode field is made and mixes ytterbium Active Optical Fiber finished product.
Surrounding layer and protective layer all use common process in the preparation method that above-mentioned large mode field mixes ytterbium Active Optical Fiber.
The utility model compared with prior art possessed by advantage are as follows: improve optical fiber mode field diameter while make light
Fibre has higher numerical aperture；To which optical fiber has big mode field area and can obtain high beam matter by bending modeling method
Amount.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the optical fiber of the utility model.
Fig. 2 is the refractive index profile schematic diagram of the optical fiber of the utility model.
Specific embodiment
Example 1, a kind of large mode field mix the preparation method of ytterbium Active Optical Fiber comprising following steps:
(1), base tube pre-processes, and base tube is preheated to and effectively eliminated the impurity and bubble of base tube inner wall；
Wherein the diameter of base tube is 32mm, and wall thickness 2.5mm, the cross-sectional area of base tube is 231.5mm2 ；
(2), will be processed that base tube deposit mixed with the first inner cladding of fluorine, the flow of fluorine is 1sccm, deposits the number of plies
It is 2 layers；
(3), the post-depositional base tube of the first inner cladding in step (2) is passed through SiCl at 1550 DEG C4Gas carries out titanium dioxide
Silicon loosening body deposition, SiCl4The volume flow being passed through is 200sccm, cuts off the tail pipe of base tube after deposition, is then immersed in
It impregnates and is impregnated 0.3 hour in aqueous solution, be passed through N after immersion in base tube2The moisture in silica loosening body layer is dried up,
It impregnates in aqueous solution and contains AlCl3、YbCl3、CeCl3And H3PO4, AlCl3Molar concentration be 0.25 %, YbCl3It is mole dense
Degree is 0.05%, CeCl3Molar concentration be 0.05 %, H3PO4Molar concentration be 0.2 %；
(4), the base tube after step (3) drying is connected into tail pipe again again, is then first passed through O at 860 DEG C2To in base tube
Aluminium, ytterbium, cerium and the phosphorus of silica loosening body are aoxidized, O2The time being passed through is 35 minutes, O2The volume flow being passed through is
150sccm；Then it is passed through Cl again2Silica loosening body layer in base tube is dried, Cl2The time being passed through is 35 minutes,
Cl2The volume flow being passed through is 110sccm；Silica loosening body layer is sintered into sandwich layer at 1700 DEG C again；
(5), the second sandwich layer is obtained after repeating step (3) and step (4) 3 times；
(6), the post-depositional base tube of the second sandwich layer in step (5) is passed through SiCl at 1600 DEG C4Gas carries out silica
Loosening body deposition, SiCl4The volume flow being passed through is 150sccm, is cut off the tail pipe of base tube after deposition, be then immersed in
It is impregnated 0.6 hour in identical immersion aqueous solution in step (3), is passed through N after immersion in base tube2Silica is dried up to dredge
Moisture in loose body layer；
(7), the base tube after step (6) drying is connected into tail pipe again again, is then first passed through O at 900 DEG C2To in base tube
Aluminium, ytterbium, cerium and the phosphorus of silica loosening body are aoxidized, O2The time being passed through is 45 minutes, O2The volume flow being passed through is
160sccm；Then it is passed through Cl again2Silica loosening body layer in base tube is dried, Cl2The time being passed through is 40 minutes,
Cl2The volume flow being passed through is 120sccm；Silica loosening body layer is sintered into first sandwich layer at 1800 DEG C again, is being sintered
While be passed through sulfur hexafluoride gas, the volume flow that sulfur hexafluoride gas is passed through is 1sccm；
(8), there is the base tube of the first sandwich layer to collapse in 2150 DEG C of progress forward directions and reversely sintering in step (7), be made big
Mould field mixes ytterbium Active Optical Fiber prefabricated rods；
(9), polish simultaneously casing to preform, octagon will be worn into outside casing；Then by the optical fiber
Prefabricated rods draw and attenuate into silica fibre；
(10), one layer of low-refraction coating is first coated outside silica fibre obtained in step (9), at ultra-violet curing
Reason forms surrounding layer, is then coated with one layer of acrylic resin optical fiber coatings, forms protective layer by ultra-violet curing processing, thus
Large mode field as shown in Figure 1 is made and mixes ytterbium Active Optical Fiber finished product, Fig. 2 is the refractive index profile schematic diagram of the optical fiber, it by interior and
It is successively made of outside the first sandwich layer 1, the second sandwich layer 2, the first inner cladding 3, the second inner cladding 4, surrounding layer 5 and protective layer 6, wherein
Main component is silica in first sandwich layer 1, and adulterates the element of following molar percentage: wherein aluminium: 2.2, ytterbium: and 0.05,
Phosphorus: 2, cerium: 0.05, fluorine: 0.2；First sandwich layer, 1 radius is r1；
Main component is silica in second sandwich layer 2, and adulterates the element of following molar percentage: wherein aluminium: 2.2,
Ytterbium: 0.05, phosphorus: 2, cerium: 0.05；Second sandwich layer, 2 radius is r2；
The fluorine element that first inner cladding 3 is 0.2 doped with molar percentage；
The radius of first inner cladding 3 is r3, the second inner cladding 4 radius be r4, surrounding layer 5 radius be r5With protective layer 6
Radius be r6 。
Example 2, a kind of large mode field mix the preparation method of ytterbium Active Optical Fiber comprising following steps:
(1), base tube pre-processes, and base tube is preheated to and effectively eliminated the impurity and bubble of base tube inner wall；
Wherein the diameter of base tube is 32mm, and wall thickness 2.5mm, the cross-sectional area of base tube is 231.5mm2 ；
(2), will be processed that base tube deposit mixed with the first inner cladding of fluorine, the flow of fluorine is 3sccm, deposits the number of plies
It is 3 layers；
(3), the post-depositional base tube of the first inner cladding in step (2) is passed through SiCl at 1550 DEG C4Gas carries out titanium dioxide
Silicon loosening body deposition, SiCl4The volume flow being passed through is 300sccm, cuts off the tail pipe of base tube after deposition, is then immersed in
It impregnates and is impregnated 0.5 hour in aqueous solution, be passed through N after immersion in base tube2The moisture in silica loosening body layer is dried up,
It impregnates in aqueous solution and contains AlCl3、YbCl3、CeCl3And H3PO4, AlCl3Molar concentration be 0.4 %, YbCl3Molar concentration
For 0.1%, CeCl3Molar concentration be 0.1 %, H3PO4Molar concentration be 0.4 %；
(4), the base tube after step (3) drying is connected into tail pipe again again, is then first passed through O at 870 DEG C2To in base tube
Aluminium, ytterbium, cerium and the phosphorus of silica loosening body are aoxidized, O2The time being passed through is 40 minutes, O2The volume flow being passed through is
160sccm；Then it is passed through Cl again2Silica loosening body layer in base tube is dried, Cl2The time being passed through is 40 minutes,
Cl2The volume flow being passed through is 120sccm；Silica loosening body layer is sintered into sandwich layer at 1800 DEG C again；
(5), the second sandwich layer is obtained after repeating step (3) and step (4) 4 times；
(6), the post-depositional base tube of the second sandwich layer in step (5) is passed through SiCl at 1600 DEG C4Gas carries out silica
Loosening body deposition, SiCl4The volume flow being passed through is 200sccm, is cut off the tail pipe of base tube after deposition, be then immersed in
It is impregnated 0.6 hour in identical immersion aqueous solution in step (3), is passed through N after immersion in base tube2Silica is dried up to dredge
Moisture in loose body layer；
(7), the base tube after step (6) drying is connected into tail pipe again again, is then first passed through O at 900 DEG C2To in base tube
Aluminium, ytterbium, cerium and the phosphorus of silica loosening body are aoxidized, O2The time being passed through is 45 minutes, O2The volume flow being passed through is
170sccm；Then it is passed through Cl again2Silica loosening body layer in base tube is dried, Cl2The time being passed through is 40 minutes,
Cl2The volume flow being passed through is 120sccm；Silica loosening body layer is sintered into first sandwich layer at 1900 DEG C again, is being sintered
While be passed through sulfur hexafluoride gas, the volume flow that sulfur hexafluoride gas is passed through is 3sccm；
(8), there is the base tube of the first sandwich layer to collapse in 2150 DEG C of progress forward directions and reversely sintering in step (7), be made big
Mould field mixes ytterbium Active Optical Fiber prefabricated rods；
(9), polish simultaneously casing to preform, octagon will be worn into outside casing；Then by the optical fiber
Prefabricated rods draw and attenuate into silica fibre；
(10), one layer of low-refraction coating is first coated outside silica fibre obtained in step (9), at ultra-violet curing
Reason forms surrounding layer, is then coated with one layer of acrylic resin optical fiber coatings, forms protective layer by ultra-violet curing processing, thus
Large mode field as shown in Figure 1 is made and mixes ytterbium Active Optical Fiber finished product, Fig. 2 is the refractive index profile schematic diagram of the optical fiber, it by interior and
It is successively made of outside the first sandwich layer 1, the second sandwich layer 2, the first inner cladding 3, the second inner cladding 4, surrounding layer 5 and protective layer 6, wherein
Main component is silica in first sandwich layer 1, and adulterates the element of following molar percentage: wherein aluminium: 1.2, ytterbium: and 0.18,
Phosphorus: 3.0, cerium: 0.1, fluorine: 0.3；First sandwich layer, 1 radius is r1；
Main component is silica in second sandwich layer 2, and adulterates the element of following molar percentage: wherein aluminium: 1.2,
Ytterbium: 0.18, phosphorus: 3.0, cerium: 0.1；Second sandwich layer, 2 radius is r2；
The fluorine element that first inner cladding 3 is 0.2 doped with molar percentage；
The radius of first inner cladding 3 is r3, the second inner cladding 4 radius be r4, surrounding layer 5 radius be r5With protective layer 6
Radius be r6。
Example 3, a kind of large mode field mix the preparation method of ytterbium Active Optical Fiber comprising following steps:
(1), base tube pre-processes, and base tube is preheated to and effectively eliminated the impurity and bubble of base tube inner wall；
Wherein the diameter of base tube is 32mm, and wall thickness 2.5mm, the cross-sectional area of base tube is 231.5mm2 ；
(2), will be processed that base tube deposit mixed with the first inner cladding of fluorine, the flow of fluorine is 5sccm, deposits the number of plies
It is 4 layers；
(3), the post-depositional base tube of the first inner cladding in step (2) is passed through SiCl at 1550 DEG C4Gas carries out titanium dioxide
Silicon loosening body deposition, SiCl4The volume flow being passed through is 100sccm, cuts off the tail pipe of base tube after deposition, is then immersed in
It impregnates and is impregnated 0.6 hour in aqueous solution, be passed through N after immersion in base tube2The moisture in silica loosening body layer is dried up,
It impregnates in aqueous solution and contains AlCl3、YbCl3、CeCl3And H3PO4, AlCl3Molar concentration be 0.4 %, YbCl3Molar concentration
For 0.3 %, CeCl3Molar concentration be 0.2 %, H3PO4Molar concentration be 0.5 %；
(4), the base tube after step (3) drying is connected into tail pipe again again, is then first passed through O at 900 DEG C2To in base tube
Aluminium, ytterbium, cerium and the phosphorus of silica loosening body are aoxidized, O2The time being passed through is 45 minutes, O2The volume flow being passed through is
165sccm；Then it is passed through Cl again2Silica loosening body layer in base tube is dried, Cl2The time being passed through is 45 minutes,
Cl2The volume flow being passed through is 150sccm；Silica loosening body layer is sintered into sandwich layer at 2000 DEG C again；
(5), the second sandwich layer is obtained after repeating step (3) and step (4) 5 times；
(6), the post-depositional base tube of the second sandwich layer in step (5) is passed through SiCl at 1600 DEG C4Gas carries out silica
Loosening body deposition, SiCl4The volume flow being passed through is 250sccm, is cut off the tail pipe of base tube after deposition, be then immersed in
It is impregnated 0.6 hour in identical immersion aqueous solution in step (3), is passed through N after immersion in base tube2Silica is dried up to dredge
Moisture in loose body layer；
(7), the base tube after step (6) drying is connected into tail pipe again again, is then first passed through O at 900 DEG C2To in base tube
Aluminium, ytterbium, cerium and the phosphorus of silica loosening body are aoxidized, O2The time being passed through is 45 minutes, O2The volume flow being passed through is
170sccm；Then it is passed through Cl again2Silica loosening body layer in base tube is dried, Cl2The time being passed through is 50 minutes,
Cl2The volume flow being passed through is 140sccm；Silica loosening body layer is sintered into first sandwich layer at 1900 DEG C again, is being sintered
While be passed through sulfur hexafluoride gas, the volume flow that sulfur hexafluoride gas is passed through is 5sccm；
(8), there is the base tube of the first sandwich layer to collapse in 2150 DEG C of progress forward directions and reversely sintering in step (7), be made big
Mould field mixes ytterbium Active Optical Fiber prefabricated rods；
(9), polish simultaneously casing to preform, octagon will be worn into outside casing；Then by the optical fiber
Prefabricated rods draw and attenuate into silica fibre；
(10), one layer of low-refraction coating is first coated outside silica fibre obtained in step (9), at ultra-violet curing
Reason forms surrounding layer, is then coated with one layer of acrylic resin optical fiber coatings, forms protective layer by ultra-violet curing processing, thus
Large mode field as shown in Figure 1 is made and mixes ytterbium Active Optical Fiber finished product, Fig. 2 is the refractive index profile schematic diagram of the optical fiber, it by interior and
It is successively made of outside the first sandwich layer 1, the second sandwich layer 2, the first inner cladding 3, the second inner cladding 4, surrounding layer 5 and protective layer 6, wherein
Main component is silica in first sandwich layer 1, and adulterates the element of following molar percentage: wherein aluminium: 4, ytterbium: and 0.35, phosphorus:
4, cerium: 0.2, fluorine: 0.3；First sandwich layer, 1 radius is r1；
Main component is silica in second sandwich layer 2, and adulterates the element of following molar percentage: wherein aluminium: 4, ytterbium:
0.35, phosphorus: 4, cerium: 0.2；Second sandwich layer, 2 radius is r2；
The fluorine element that first inner cladding 3 is 0.3 doped with molar percentage；
The radius of first inner cladding 3 is r3, the second inner cladding 4 radius be r4, surrounding layer 5 radius be r5With protective layer 6
Radius be r6。
The large mode field of example 1, example 2 and example 3 is mixed into ytterbium Active Optical Fiber detection parameters and final testing result is as shown in table 1；Its
Test condition is that the LD pump power output of two 915 nm is 100W, raster center wavelength 1060nm.
Table 1
Claims (2)
1. a kind of large mode field mixes ytterbium Active Optical Fiber, it is characterized in that it is from inside to outside successively by the first sandwich layer, the second sandwich layer, first
Covering, the second inner cladding, surrounding layer and protective layer composition, wherein the outside of the second inner cladding is octagon, the first sandwich layer
Radius r1It is 1~10 μm, the radius r of the second sandwich layer2It is 5~50 μm, wherein the first core radius r1With the second core radius r2
The ratio between be 0.1~0.3；First inner cladding diameter r3With the second core radius r2Difference be 0.2~1 μm；Second inner cladding, eight side
The inscribed circle radius r of any two opposite side of shape4It is 60~400 μm；The refringence △ n of first sandwich layer and the second inner cladding1For
0.07~0.15%；The refringence △ n of second sandwich layer and the second inner cladding2It is 0.08~0.16%, and △ n2≥△n1；First
The refringence △ n of inner cladding and the second inner cladding3It is -0.02~-0.01%.
2. a kind of large mode field according to claim 1 mixes ytterbium Active Optical Fiber, it is characterized in that the numerical aperture of the second inner cladding
More than or equal to 0.46；Using the refractive index that wavelength is the second covering of 670nm laser testing 1.4570~1.4573.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820783A (en) * | 2021-08-12 | 2021-12-21 | 江苏法尔胜光电科技有限公司 | Photosensitive erbium-ytterbium co-doped optical fiber for high power and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820783A (en) * | 2021-08-12 | 2021-12-21 | 江苏法尔胜光电科技有限公司 | Photosensitive erbium-ytterbium co-doped optical fiber for high power and preparation method thereof |
| CN113820783B (en) * | 2021-08-12 | 2023-08-25 | 江苏法尔胜光电科技有限公司 | High-power photosensitive erbium-ytterbium co-doped optical fiber and preparation method thereof |
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Effective date of registration: 20210926 Address after: 214400 No.278 Chengjiang Middle Road, high tech Zone, Jiangyin City, Wuxi City, Jiangsu Province Patentee after: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Address before: 214434 No. 165 Chengjiang Middle Road, Jiangyin, Wuxi, Jiangsu. Patentee before: JIANGSU FASTEN OPTICAL COMMUNICATION TECHNOLOGY Co.,Ltd. Patentee before: JIANGSU FASTEN PHOTONICS Co.,Ltd. Patentee before: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Patentee before: FASTEN GROUP Co.,Ltd. |