CN107329205A - A kind of rare-earth doped optical fibre - Google Patents
A kind of rare-earth doped optical fibre Download PDFInfo
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- CN107329205A CN107329205A CN201710770410.8A CN201710770410A CN107329205A CN 107329205 A CN107329205 A CN 107329205A CN 201710770410 A CN201710770410 A CN 201710770410A CN 107329205 A CN107329205 A CN 107329205A
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of rare-earth doped optical fibre.The optical fiber includes doped core, the first silica clad, the second silica clad and organic coating covering from the inside to the outside；Its second silica clad relative to the first silica clad numerical aperture between 0.1 to 0.24；Its organic coating covering is more than or equal to 0.35 relative to the numerical aperture of the first silica clad.The optical fiber significantly reduces the light leak of organic coating covering, improves the reliability of long-term work, increases the service life.
Description
Technical field
The invention belongs to Fiber laser technology field, more particularly, to a kind of laser rare-earth doped optical fibre.
Background technology
Optical fiber laser is a kind of laser for using optical fibers as gain medium, by optical fiber quartz substrate
The different rare earth ion of doping, obtains the laser output of different-waveband.Optical fiber laser is because of high, the specific surface area with beam quality
Big good heat dissipation, high conversion efficiency, small volume, compact conformation, it is easy to safeguard, in industrial processes, medical treatment, military and communication
It is used widely etc. multi-field.
Early application is all single clad rare earth doped, it is desirable to which pump light is directly injected into fibre core, when pumping work(
When rate gradually increases, generally only tens μm of fibre core is difficult further raising pump light injection efficiency and power, is being passed
The outside of the optical fiber pure silica cladding of system coats certain thickness low-refraction coating, and its refractive index can be noted from 1.3 to 1.4
Enter more multimode pump lights, at present using the doubly clad optical fiber of the design, especially yb-doped double-clad fiber, covering is straight
Footpath is bigger to reach 600 μm even 800 μm up to more than 400 μm, it is possible to achieve single fiber laser exports thousands of watts, or even up to myriawatt
Rank.And other rare-earth doped optical fibres, such as mix thulium, the doubly clad optical fiber such as erbium can also reach thousands of watts of laser output.
This doubly clad optical fiber simultaneously, by injecting multimode pump light to covering, low NA and small size to mix rare earth fine
The laser for the specific wavelength that pattern is more preferable, power is higher is converted in core (usual 10 μm or 20 μm of fibre core size).In order to obtain
Get Geng Gao laser-conversion efficiency, its silica clad often uses non-circular section, so as to destroy symmetric figure so that more pumps
Pu light injection fibre core, so as to be absorbed the laser output for being converted to needs by fibre core.It is interior using pure quartz glass in double clad light
Covering, using fluorine doped acrylic resin paint as surrounding layer.Because fluorine doped acrylic resin paint has ultralow refractive index (refraction
Rate is 1.3 or so), the pump light for being injected into inner cladding is totally reflected in inner cladding with surrounding layer interface.But interface is not
It is complete minute surface, while the pump light for having part can be propagated in the form of evanescent wave in fluorine doped acrylic resin, works as process
During prolonged laser emission, too high temperature, laser emission and the intrusion of steam can all cause low-refraction coating to occur
Aging, especially in superpower laser, the aging speed will be accelerated.When aging occurs for low refractive index coating, it is definitely rolled over
The rate of penetrating can raise, can be reduced with the adhesive force of glass-clad, while there is situations such as stripping comes off, produces micro-crack, have impact on
The gain performance of optical fiber, occurs light leak when serious, burn optical fiber, or even damages other devices of optical fiber laser, bag
Include bundling device, pumping member, isolator etc..
Meanwhile, asymmetrical preform is drawn into satisfactory optical fiber difficulty larger, existing technical conditions
The geometry control of lower optical fiber is difficult to control to, and unstability, string diameter all occurs in the especially control of string diameter and the measurement of drawing tensile force
Wave zone carry out fiber optic splicing loss, the fluctuation of tension force can cause the intensity of optical fiber to be deteriorated, it is big that change is lost.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of laser rare-earth doped optical fibre,
Its object is to by adding the relatively low silica clad of refractive index between silica clad and the organic coating covering of low-refraction,
Thus solving the current easy aging of laser rare-earth doped optical fibre coating causes the problem of laser life-span is shorter, while solution is by no means
Circular prefabricated stick drawn wire string diameter causes the technical problem that optical fiber parameter differs greatly with tension fluctuation.
To achieve the above object, according to one aspect of the present invention there is provided a kind of rare-earth doped optical fibre, the optical fiber by
It is interior to outer to include doped core, the first silica clad, the second silica clad and organic coating covering；
Second silica clad relative to the first silica clad numerical aperture between 0.1 to 0.24；
The organic coating covering is more than or equal to 0.35 relative to the numerical aperture of the first silica clad.
Preferably, the area of section ratio of the rare-earth doped optical fibre, its doped core and first silica clad is 1:
Between 6-1600.
Preferably, the area of section ratio of the rare-earth doped optical fibre, its first silica clad and second silica clad
In 3-50:Between 1.
Preferably, the rare-earth doped optical fibre, its second silica clad is fluorine-doped quartz layer.
Preferably, the rare-earth doped optical fibre, its second silica clad cross-sectional shape is rounded, and with the doped core
It is concentric in geometry.
Preferably, the rare-earth doped optical fibre, its first silica clad is pure silica cladding.
Preferably, the rare-earth doped optical fibre, its first silica clad cross-sectional shape is non-circular.
Preferably, the rare-earth doped optical fibre, its first silica clad cross-sectional shape in 4D, D type, octagon, hexagon,
Blossom type, square or rectangle.
Preferably, the rare-earth doped optical fibre, its doped core relative to the first silica clad numerical aperture 0.06
To between 0.25, doped core radius is between 2.5 μm to 200 μm.
Preferably, the rare-earth doped optical fibre, its organic coating cladding thickness is between 20 μm to 40 μm.
In general, by the contemplated above technical scheme of the present invention compared with prior art, due to that can obtain down
Row beneficial effect：
The present invention provides laser rare-earth doped optical fibre, by original rare-earth doped optical fibre basis, in pure quartz
Between covering and organic coating covering increase by one layer of low-refraction silica clad, such as fluorine-doped quartz layer and groped refractive index and
Physical dimension parameter so that fibre core, the first quartz layer covering and the second silica clad formation refractive index " trap ", so as to ensure note
Enter more pump lights, the application characteristic for possessing current doubly clad optical fiber may be directly applied to existing laser；While the
One silica clad, second adapt to covering and the decline of organic coating cladding index gradient, significantly reduce organic coating covering
Light leak, during laser high power work, pump light is limited in inside of optical fibre, and the organic coating life-span is significantly increased, simultaneously
It is avoided that and burns laser other elements, so that the laser for improving optical fiber bears power, improves the reliability of long-term work, extension
Service life, it is to avoid sinkage.
Preferred scheme, it is circle that rare-earth doped optical fibre of the present invention, which provides the second silica clad cross-sectional shape, can improve welding
Uniformity.Because the round fiber that existing optical fiber splicer is communication is designed, the V grooves of optical fiber are especially shelved, it is non-
The angle that circuit symmetric fiber is placed on V grooves is different, and the fibre core of optical fiber and the angle of covering are just different, the height after fibre core placement
It is all inconsistent with position, it is difficult to ensure the uniformity of each welding.The triply coated fiber glass outer layer of the present invention is circle, can be with
The heat sealing machine of all purpose communication optical fiber, significantly improves the uniformity of welding, reduces the requirement to operating personnel and heat sealing machine.
The ends cutting success rate of optical fiber can be improved simultaneously, especially for the optical fiber of major diameter, cutting times is reduced, improves
Efficiency.Because doubly clad optical fiber glass-clad is generally non-circular, and existing optical fiber cutter is designed for round fiber,
The seamed edge of non-circuit symmetric fiber and the face stress in cutting are different, and chipping is formed during cutting seamed edge and the probability of breach is bigger；
The triply coated fiber glass outer layer of the present invention is circle, uniform force during cutting, excellent during especially for large-diameter fibre-optical to cutting
Changing chipping and breach has notable optimization.
The second silica clad of optical fiber cross-sectional shape that the present invention is provided is circle, it is easy to stretch forming, can improve optical fiber
Wire drawing string diameter is fluctuated, and what it is due to traditional doubly clad optical fiber glass part is all non-circular before and after wire drawing, light in drawing process
Fine torsion will make string diameter control difficulty increase, and the glass outer layer of optical fiber of the present invention is circle, the string diameter of circular wire drawing optical fiber
Control, equivalent to conventional telecommunication optical fiber, to be more prone to control, reduce string diameter fluctuation, improve batch uniformity.
Brief description of the drawings
Fig. 1 to 3 is the rare-earth doped optical fibre structure and refractive index profile schematic diagram of the embodiment of the present invention 1 to 3 respectively；
Fig. 4 is the rare-earth doped optical fibre structural representation that the first silica clad profile of the invention is not rounded symmetric figure；Fig. 4 A
For the silica clads of 4D first；Fig. 4 B are the silica clad of D types first；Fig. 4 C are square first silica clad；Fig. 4 D are rectangle
First silica clad；Fig. 4 E are the silica clad of blossom type first；Fig. 4 F are the silica clad of hexagon first, and the second silica clad is cut
Face inner shape is in be engaged with the first silica clad section external boundary.
In all of the figs, identical reference is used for representing identical structure, wherein：1 is fibre core, and 2 be the first stone
English covering, 3 be the second silica clad, and 4 be organic coating covering, and 5 be outer layer.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
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 each embodiment of invention described below
Not constituting conflict each other can just be mutually combined.
The laser rare-earth doped optical fibre that the present invention is provided, as shown in figure 1, including from the inside to the outside include doped core,
First silica clad, the second silica clad, organic coating covering and outer layer；
The doped core, relative to the first silica clad numerical aperture between 0.06 to 0.25.Its section is preferred
For circle, its radius is between 2.5 μm to 200 μm.The fibre core can mix germanium, aluminium, phosphorus, the dopant such as fluorine；It can also adulterate dilute
Native ion includes ytterbium, erbium, thulium, holmium, a kind of or its a variety of combination such as cerium.
The section of first silica clad, preferably pure quartz layer, the doped core and first silica clad
Area ratio is 1:Between 3-1600.Its cross-sectional shape is in non-concentric with sandwich layer cross-sectional shape, i.e., when the first silica clad section
When profile is circle, the first silica clad cross-sectional shape and sandwich layer cross-sectional shape decentraction, or first silica clad are cut
Facial contour is noncircularity.The first silica clad cross-sectional shape is preferred with non-circular, including symmetric figure, such as：4D shapes, eight sides
Shape, hexagon, blossom type, square or rectangle；Unsymmetrical, such as D-shaped.First silica clad, it is symmetrical using not rounded
Shape, physical dimension is much larger than the doped core, for constraining clad pumping optical, pump light is fully absorbed by sandwich layer.
Second silica clad relative to the first silica clad numerical aperture between 0.1 to 0.24；Second quartz
Covering is fluorine-doped quartz layer.Fluorine-doped quartz, can meet requirement of the present invention for the second silica clad numerical aperture, ensure simultaneously
The efficiency of transmission of pump light, industrial mass manufacture of being more convenient for.Shape is in and the first silica clad in the second silica clad section
The not rounded symmetric figure being engaged, such as 4D, D type, octagon, hexagon, blossom type, square or rectangle (such as Fig. 4 to Fig. 9
It is shown)；Its profile is in the shape for being easy to draw processing, for example, square, circle.First silica clad and described second
The area of section ratio of silica clad is in 3-50:Between 1.Second silica clad, for preventing pump light from leaking to organic painting
Expect covering, increase the heat resistance of optical fiber so as to improving pump power, consider difficulty of processing, assimilation effect, transmission performance and
Cost, selection above numerical aperture and physical dimension.Relative value aperture is smaller, and physical dimension accordingly increases, then cost increase
Pump absorption effect, transmission performance have no and significantly improved simultaneously, and the too small relative value aperture of physical dimension is difficult to further raising,
Assimilation effect, transmission performance can not be ensured, while difficulty of processing steeply rises.
The organic coating covering is more than or equal to 0.35 relative to the numerical aperture of the first silica clad, and its thickness is 20
μm between 40 μm.
The outer layer is resinous coat.
The laser rare-earth doped optical fibre that the present invention is provided, preparation method is as follows：
(1) doped core is wrapped up with the first silica clad material, and predetermined profile is processed into its section, obtained prefabricated
Rod semi-finished product；Can be using one of following operation：
A, outside vapor deposition；
B, vapor axial deposition；
C, chemical vapor deposition；
D, plasma chemical vapor deposition；
E, collapsing pipe burn real parcel.
(2) the prefabricated rods semi-finished product that will be obtained in step (1), are wrapped up, and its section is added with the second silica clad material
Work obtains the rare-earth doped optical fibre prefabricated rods into predetermined profile.Also using one of following operation：
A, outside vapor deposition；
B, vapor axial deposition；
C, chemical vapor deposition；
D, plasma chemical vapor deposition；
E, collapsing pipe burn real parcel.
It is preferred to use collapsing pipe and burns real parcel, is specially：
Doped core to be wrapped is fixed in the collapsing pipe of the first silica clad material or consolidates prefabricated rods semi-finished product
In the collapsing pipe for being scheduled on the second quartzy layer material, carry out collapsing and burn real.
(3) preform obtained in step (2) is drawn and be molded, that is, the rare-earth doped optical fibre is made.
It is embodiment below：
Embodiment 1
A kind of laser rare-earth doped optical fibre, as shown in figure 1, including including doped core, the first quartz from the inside to the outside
Covering, the second silica clad, organic coating covering and outer layer；
The doped core, the numerical aperture relative to the first silica clad is 0.06.Its section is circle, its radius
Between 25 μm.The fibre core doping component is 1.2%wt Yb2O3, 3.5%wt P2O5, 3.0%wt Al2O3。
First silica clad, is pure quartz layer, and cross-sectional shape is octagon, and radius is 182.5 μm, described first
Silica clad radius refers to the half of the parallel opposite side distance of octagon two.
Second silica clad is 0.22 relative to the numerical aperture of the first silica clad；Second silica clad is fluorine doped
Quartz layer, fluorine doped mass percent 5%.Shape is in and is engaged with the first silica clad in the second silica clad section；Outside it
Shape is rounded.The second silica clad radius is 200 μm.
The organic coating covering is 0.47 relative to the numerical aperture of the first silica clad, and its thickness is 35 μm.
The outer layer is acrylic resin coating, circular, and radius is 275 μm, and relatively pure quartzy numerical aperture is 0.25.
The laser rare-earth doped optical fibre that the present embodiment is provided, is prepared as follows：
(1) doped core is wrapped up with the first silica clad material, and octagon is processed into its section, obtained prefabricated
Rod semi-finished product；Prepared using chemical vapor deposition；
(2) the prefabricated rods semi-finished product that will be obtained in step (1), are wrapped up, and its section is added with the second silica clad material
Work obtains the rare-earth doped optical fibre prefabricated rods into predetermined profile, and burning real parcel using collapsing pipe prepares.
(3) the rare-earth doped optical fibre preform obtained in step (2) is formed into rare-earth doped optical fibre.
Embodiment 2
A kind of laser rare-earth doped optical fibre, as shown in Fig. 2 including including doped core, the first quartz from the inside to the outside
Covering, the second silica clad, organic coating covering and outer layer；
The doped core, the numerical aperture relative to the first silica clad is 0.2.Its section is circle, its radius
Between 5 μm.The fibre core doping component is 1.0%wt Yb2O3, 3.5%wt P2O5, 6.2%wt Al2O3。
First silica clad, is pure quartz layer, and cross-sectional shape is regular hexagon；Radius is 65 μm, first stone
English cladding radius refers to the half of the parallel opposite side distance of two, hexagon.
Second silica clad is 0.12 relative to the numerical aperture of the first silica clad；Second silica clad is fluorine doped
Quartz layer, fluorine doped mass percent 1.18%.Shape is in and is engaged with the first silica clad in the second silica clad section；Its
Profile is rounded.The second silica clad radius is 75 μm.
The organic coating covering is 0.47 relative to the numerical aperture of the first silica clad, and its thickness is 35 μm.
The outer layer is acrylic resin coating, circular.
The laser rare-earth doped optical fibre that the present embodiment is provided, is prepared as follows：
(1) doped core is wrapped up with the first silica clad material, and octagon is processed into its section, obtained prefabricated
Rod semi-finished product；Prepared using chemical vapor deposition；
(2) the prefabricated rods semi-finished product that will be obtained in step (1), are wrapped up, and its section is added with the second silica clad material
Work obtains the rare-earth doped optical fibre prefabricated rods into predetermined profile, and burning real parcel using collapsing pipe prepares.
(3) the rare-earth doped optical fibre preform obtained in step (2) is formed into rare-earth doped optical fibre.
Embodiment 3
A kind of laser rare-earth doped optical fibre, as shown in figure 3, including including doped core, the first quartz from the inside to the outside
Covering, the second silica clad, organic coating covering and outer layer；
The doped core, the numerical aperture relative to the first silica clad is 0.1.Its section is circle, its radius
Between 100 μm.The fibre core doping component is 1.0%wt Yb2O3, 3.5%wt P2O5, 4.1%wt Al2O3。
First silica clad, is pure quartz layer, and cross-sectional shape is octagon；Radius is 200 μm, first stone
English cladding radius refers to the half of the parallel opposite side distance of octagon two.
Second silica clad is 0.20 relative to the numerical aperture of the first silica clad；Second silica clad is fluorine doped
Quartz layer, fluorine doped mass percent 3.96%.Shape is in and is engaged with the first silica clad in the second silica clad section；Its
Profile is rounded.The second silica clad radius is 1400 μm.
The organic coating covering is 0.47 relative to the numerical aperture of the first silica clad, and its thickness is 35 μm.
The outer layer is acrylic resin coating, circular.
The laser rare-earth doped optical fibre that the present embodiment is provided, is prepared as follows：
(1) doped core is wrapped up with the first silica clad material, and octagon is processed into its section, obtained prefabricated
Rod semi-finished product；Prepared using chemical vapor deposition；
(2) the prefabricated rods semi-finished product that will be obtained in step (1), are wrapped up, and its section is added with the second silica clad material
Work obtains the rare-earth doped optical fibre prefabricated rods into predetermined profile, and burning real parcel using collapsing pipe prepares.
(3) the rare-earth doped optical fibre preform obtained in step (2) is formed into rare-earth doped optical fibre.
The doped fiber structure that the present invention is provided, it is adaptable to the first silica clad of a variety of not rounded symmetric figures, such as Fig. 4 institutes
Show.
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, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (10)
1. a kind of rare-earth doped optical fibre, it is characterised in that the optical fiber include from the inside to the outside doped core, the first silica clad,
Second silica clad and organic coating covering；
Second silica clad relative to the first silica clad numerical aperture between 0.1 to 0.24；
The organic coating covering is more than or equal to 0.35 relative to the numerical aperture of the first silica clad.
2. rare-earth doped optical fibre as claimed in claim 1, it is characterised in that the doped core and first silica clad
Area of section ratio 1:Between 3-1600.
3. rare-earth doped optical fibre as claimed in claim 1, it is characterised in that first silica clad and second quartz
The area of section ratio of covering is in 3-50:Between 1.
4. rare-earth doped optical fibre as claimed in claim 1, it is characterised in that second silica clad is fluorine-doped quartz layer.
5. rare-earth doped optical fibre as claimed in claim 1, it is characterised in that the second silica clad cross-sectional shape is in circle
Shape, and it is concentric in geometry with the doped core.
6. rare-earth doped optical fibre as claimed in claim 1, it is characterised in that first silica clad is pure silica cladding.
7. rare-earth doped optical fibre as claimed in claim 1, it is characterised in that the first silica clad cross-sectional shape is not rounded
Shape.
8. rare-earth doped optical fibre as claimed in claim 7, it is characterised in that the first silica clad cross-sectional shape is in 4D, D
Type, octagon, hexagon, blossom type, square or rectangle.
9. rare-earth doped optical fibre as claimed in claim 1, it is characterised in that the doped core is relative to the first silica clad
Numerical aperture between 0.06 to 0.25, doped core radius is between 2.5 μm to 200 μm.
10. rare-earth doped optical fibre as claimed in claim 1, it is characterised in that the organic coating cladding thickness at 20 μm extremely
Between 40 μm.
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