CN110187437A - A kind of triply coated fiber, pump combiner, fiber grating and optical fiber laser - Google Patents
A kind of triply coated fiber, pump combiner, fiber grating and optical fiber laser Download PDFInfo
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- CN110187437A CN110187437A CN201910570517.7A CN201910570517A CN110187437A CN 110187437 A CN110187437 A CN 110187437A CN 201910570517 A CN201910570517 A CN 201910570517A CN 110187437 A CN110187437 A CN 110187437A
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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
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094007—Cladding pumping, i.e. pump light propagating in a clad surrounding the active core
Abstract
The present invention is suitable for optical field, provides a kind of triply coated fiber, pump combiner, fiber grating and optical fiber laser.Triple clad passive fiber includes fibre core, the inner cladding being covered on outside fibre core, the surrounding layer being covered on outside inner cladding and the coat being covered on outside surrounding layer；The diameter of fibre core is between 10~50 microns, the diameter of inner cladding is between 250~800 microns, the diameter of surrounding layer is greater than the diameter of inner cladding, the diameter of surrounding layer is between 300~1000 microns, or, inner cladding diameter is between 80~100 microns, and outer cladding diameter is between 110~130 microns.Triple clad passive fiber of the invention is covered on the surrounding layer outside inner cladding and drastically reduces damage of the pump light for organic matter coat, and coat is as total reflection interface damage threshold superelevation, to improve the Stability and dependability of optical fiber laser.
Description
Technical field
The invention belongs to optical fields more particularly to a kind of triply coated fiber, pump combiner, fiber grating and optical fiber to swash
Light device.
Background technique
As shown in Figure 1, the double clad passive fiber of the prior art includes fibre core 101, the covering for being covered on 101 outside of fibre core
11 and it is covered on the coat 12 of the outside of covering 11, the diameter of the fibre core 101 of the double clad passive fiber of the prior art usually exists
Between 12~25 microns.
Optical fiber laser is to use the optical fiber of doping with rare-earth ions as the third generation optical fiber laser of gain media, and optical fiber swashs
The relevant parameters such as the diameter of optical fiber employed in light device determine the stability difference and reliability of optical fiber laser, and can be real
The emphasis parameter of existing target power, therefore the selection of these parameters is very crucial.Pumping in the optical fiber laser of the prior art
The optical fiber that bundling device and fiber grating generally use is double clad passive fiber as shown in Figure 1, has benefited from cladding pumping technique
With the breakthrough of high brightness pump source, the output power of commercialized optical fiber laser has been broken through kilowatt.However, with single
Transimission power is continuously increased in resonant cavity or simple optical fiber, and the power density in fiber core is also stepped up, thereupon
Nonlinear effect and fuel factor by serious influence the entire prolonged job stability of optical fiber laser；In addition laser is exported
The increase inevitable requirement of power inputs more pump lights, with born pump light power on the coat of double clad passive fiber
The increase of density, coat are reduced the reliability of optical fiber laser by high power density pump light impact.
Summary of the invention
The purpose of the present invention is to provide a kind of triply coated fiber, pump combiner, fiber grating and optical fiber laser, purports
It is solving to lead to optical fiber laser poor work stability, the low problem of reliability due to using double clad passive fiber.
In a first aspect, the present invention provides a kind of triple clad passive fiber, including fibre core, the interior packet being covered on outside fibre core
Layer, the surrounding layer being covered on outside inner cladding and the coat being covered on outside surrounding layer, the cross of fibre core, inner cladding and surrounding layer
Cross sectional shape is circle；The diameter of the fibre core of the triple clad passive fiber is between 10~50 microns；
The diameter of inner cladding is between 250~800 microns, and the diameter of surrounding layer is greater than the diameter of inner cladding, surrounding layer
Diameter is between 300~1000 microns, alternatively, inner cladding diameter is between 80~100 microns, outer cladding diameter is 110~130
Between micron.
Second aspect, the present invention provides a kind of pump combiner, the laser output optical fibre of pump combiner using
Triple clad passive fiber, the triple clad passive fiber include fibre core, the inner cladding being covered on outside fibre core, are covered on inner cladding
The surrounding layer of outside and the coat being covered on outside surrounding layer, the cross-sectional shape of fibre core, inner cladding and surrounding layer is circle
Shape；The diameter of the fibre core of the triple clad passive fiber is between 10~50 microns；The diameter of inner cladding is at 250~800 microns
Between, the diameter of surrounding layer is greater than the diameter of inner cladding, and the diameter of surrounding layer is between 300~1000 microns.
The third aspect, the present invention provides a kind of pump combiner, the pumping light output fibers and laser of pump combiner
Output optical fibre using triple clad passive fiber, the triple clad passive fiber include fibre core, be covered on it is interior outside fibre core
Covering, the surrounding layer being covered on outside inner cladding and the coat being covered on outside surrounding layer, fibre core, inner cladding and surrounding layer
Cross-sectional shape is circle；Wherein, the diameter of the fibre core for the triple clad passive fiber that pumping light output fiber uses 10~
Between 50 microns, for the diameter of inner cladding between 250~800 microns, the diameter of surrounding layer is greater than the diameter of inner cladding, surrounding layer
Diameter between 300~1000 microns；The diameter of the fibre core for the triple clad passive fiber that laser output optical fibre uses 10~
Between 50 microns, inner cladding diameter is between 80~100 microns, and outer cladding diameter is between 110~130 microns.
Fourth aspect, the present invention provides a kind of fiber gratings, and the optical fiber of fiber grating is using triple clad passive light
Fibre, the triple clad passive fiber include fibre core, the inner cladding being covered on outside fibre core, the surrounding layer being covered on outside inner cladding
With the coat being covered on outside surrounding layer, the cross-sectional shape of fibre core, inner cladding and surrounding layer is circle；The triple clad
The diameter of the fibre core of passive fiber is between 10~50 microns；The diameter of inner cladding between 250~800 microns, surrounding layer
Diameter is greater than the diameter of inner cladding, and the diameter of surrounding layer is between 300~1000 microns.
5th aspect, the present invention provides a kind of optical fiber lasers, including the first pump combiner and the second pumping to close beam
Device, wherein the first pump combiner uses the third aspect using pump combiner described in second aspect, the second pump combiner
The pump combiner.
Further, the optical fiber laser further includes the first pumping array, first being made of multiple first pumping sources
Fiber grating, first order Active Optical Fiber, the second fiber grating, second level Active Optical Fiber, mode stripper, laser export head and by
Second pumping array of multiple second pumping sources composition, the first pumping array, the first pump combiner, the first fiber grating, the
Level-one Active Optical Fiber, the second fiber grating, second level Active Optical Fiber, the second pump combiner, mode stripper and laser output
Head is sequentially connected in optical path, and the input terminal of the second pump combiner is connect with the second pumping array light path.
Further, the first fiber grating be use the reflectivity range based on triple clad passive fiber for 85%~
Fiber grating between 99.5%, the second fiber grating be use the reflectivity range based on triple clad passive fiber for 8%~
Fiber grating between 22%；First order Active Optical Fiber and second level Active Optical Fiber are triple clad Active Optical Fibers；Mode removing
Device and laser export head are all made of large mode field triple clad passive fiber.
Further, the NA value of the output pump light of each first pumping source and the second pumping source is between 0.1~0.22,
For output power between 200~500W, output wavelength has 915nm and two peak values of 975nm.
Further, the triple clad Active Optical Fiber includes fibre core, the inner cladding being covered on outside fibre core, is covered on interior packet
The surrounding layer of layer outside and the coat being covered on outside surrounding layer；The cross-sectional shape of inner cladding is octagon, fibre core, outer
The cross-sectional shape of covering and coat is circle；Surrounding layer is made of the silica-based glass of doping fluorine or boron.
Further, in large mode field triple clad passive fiber includes fibre core, the inner cladding being covered on outside fibre core, is covered on
Surrounding layer outside covering and the coat being covered on outside surrounding layer；In large mode field triple clad passive fiber, fibre core it is transversal
Face shape is octagon, and the cross-sectional shape of surrounding layer is regualr decagon, and the cross-sectional shape of inner cladding and coat is
It is round.
Further, each plane of the surrounding layer for the large mode field triple clad passive fiber that the mode stripper uses
At least one waveform etching groove is etched on the bare fibre surface of structure.
5th aspect, the present invention provides a kind of optical fiber lasers, including such as above-mentioned fiber grating.
Triple clad passive fiber is applied in high-capacity optical fiber laser, and the diameter of fibre core is too small, the excessively high meeting of power density
Lead to entire optical path less stable, the diameter of fibre core is too big, beam quality too poor can be unfavorable for processed and applied, inner cladding and outsourcing
Layer all plays a protective role, and too thin protective effect is inadequate, influences heat dissipation and bending property if too thick.In the present invention,
Since triple clad passive fiber includes the surrounding layer being covered on outside inner cladding, the diameter of the fibre core of the triple clad passive fiber
Between 10~50 microns, for the diameter of inner cladding between 250~800 microns, the diameter of surrounding layer is greater than the diameter of inner cladding,
The diameter of surrounding layer is between 300~1000 microns, alternatively, inner cladding diameter is between 80~100 microns, outer cladding diameter exists
Between 110~130 microns.Therefore, triple clad passive fiber of the invention is applied in high-capacity optical fiber laser, fibre core it is straight
Diameter can make entire optical path stabilization, be conducive to processed and applied, and the diameter of inner cladding and surrounding layer can preferably play fibre core
Protective effect is radiated with bending property preferable.Be covered on the surrounding layer outside inner cladding drastically reduce pump light for
The damage of organic matter coat, coat is as total reflection interface damage threshold superelevation, to improve the steady of optical fiber laser
Qualitative and reliability.
Again since optical fiber laser includes first order Active Optical Fiber and second level Active Optical Fiber, the first optical fiber is reduced
Grating and the second fiber grating bear the pressure of laser, and are different from traditional MOPA enlarged structure, simplify optical path, additionally it is possible to
Effectively reduce light echo amplification.
Again since beam is closed in the pumping that the first pump combiner and the second pump combiner are all based on triple clad passive fiber
Device, the first fiber grating are to use the reflectivity range based on triple clad passive fiber for the optical fiber light between 85%~99.5%
Grid, the second fiber grating are to use the reflectivity range based on triple clad passive fiber for the fiber grating between 8%~22%；
First order Active Optical Fiber and second level Active Optical Fiber are triple clad Active Optical Fibers；Mode stripper and laser export head are all made of
Large mode field triple clad passive fiber.The surrounding layer of triply coated fiber drastically reduces pump light for the damage of organic matter coat
Wound, coat improve the Stability and dependability of optical fiber laser as total reflection interface damage threshold superelevation.
Again since the output wavelength of the first pumping source and the second pumping source has 915nm and two peak values of 975nm, fill
The absorption characteristic that Active Optical Fiber is utilized divided, has taken into account the high-selenium corn of 975nm and the wide absorption characteristics of 915nm, can be effective
Shortening using Active Optical Fiber length and guaranteed good stability.
Again since the optical fiber of mode stripper and laser export head is all made of large mode field triple clad passive fiber, the cross of fibre core
Cross sectional shape is octagon, and the cross-sectional shape of surrounding layer is regualr decagon, the octagon of fibre core and conventional large mode field
The circle of the fibre core of double clad passive fiber is compared, and the spiral laser of fibre core can be eliminated, so that the Energy distribution of hot spot is more
Uniformly；The regualr decagon of surrounding layer, can be effective compared with the circle of the covering of conventional large mode field double clad passive fiber
It avoids forming spiral light in covering, while the relatively large number of plane of regualr decagon is more favorable to etching leakage waveguide, thus more
Good strips covering transmission light and effectively purifies light beam and obtain better processing effect, can also preferably handle light echo protection
Laser；For fibre core compared to the fibre core of conventional large mode field double clad passive fiber, core size and NA value are larger, can be effective
Optical power density is reduced, nonlinear effect is reduced and improves laser stability.
Each planar structure of the surrounding layer of the large mode field triple clad passive fiber used again due to mode stripper
It is etched at least one waveform etching groove on bare fibre surface, therefore smooth fully-reflected plane can be destroyed to strip
Optical mode in inner cladding avoids typical circular structure and is difficult to position, etch the problem of continuity difference, and implementation simply may be used
By processing easy to automate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the double clad passive fiber of the prior art.
Fig. 2 is the structural schematic diagram of triple clad passive fiber provided in an embodiment of the present invention.
Fig. 3 is the basic theory of constitution figure of optical fiber laser provided in an embodiment of the present invention.
Fig. 4 is the structural schematic diagram of triple clad Active Optical Fiber.
Fig. 5 is the structural schematic diagram of large mode field triple clad passive fiber.
Fig. 6 is the structural schematic diagram of mode stripper.
Fig. 7 is that the organic matter coat of the Active Optical Fiber of three kinds of Optical Maser Systems bears power distribution curve along its length
Schematic diagram.
Specific embodiment
In order to which the purpose of the present invention, technical solution and beneficial effect is more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain this hair
It is bright, it is not intended to limit the present invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Referring to Fig. 2, the embodiment of the invention provides a kind of triple clad passive fiber, including fibre core 13, it is covered on fibre core
The inner cladding 14 of 13 outsides, the surrounding layer 15 for being covered on 14 outside of inner cladding and the coat 16 for being covered on 15 outside of surrounding layer,
The cross-sectional shape of fibre core 13, inner cladding 14 and surrounding layer 15 is circle.The diameter of the fibre core 13 of triple clad passive fiber exists
Between 10~50 microns, for the diameter of inner cladding 14 between 250~800 microns, the diameter of surrounding layer 15 is greater than inner cladding 14
Diameter, the diameter of surrounding layer 15 is between 300~1000 microns, alternatively, inner cladding diameter is between 80~100 microns, outsourcing
Layer diameter is between 110~130 microns.
The embodiment of the invention also provides the first pump combiner, the laser output optical fibre of pump combiner using
Triple clad passive fiber, the triple clad passive fiber include fibre core, the inner cladding being covered on outside fibre core, are covered on inner cladding
The surrounding layer of outside and the coat being covered on outside surrounding layer, the cross-sectional shape of fibre core, inner cladding and surrounding layer is circle
Shape；The diameter of the fibre core of the triple clad passive fiber is between 10~50 microns；The diameter of inner cladding is at 250~800 microns
Between, the diameter of surrounding layer is greater than the diameter of inner cladding, and the diameter of surrounding layer is between 300~1000 microns.
The embodiment of the invention also provides second of pump combiner, the pumping light output fibers and laser of pump combiner
Output optical fibre using triple clad passive fiber, the triple clad passive fiber include fibre core, be covered on it is interior outside fibre core
Covering, the surrounding layer being covered on outside inner cladding and the coat being covered on outside surrounding layer, fibre core, inner cladding and surrounding layer
Cross-sectional shape is circle；Wherein, the diameter of the fibre core for the triple clad passive fiber that pumping light output fiber uses 10~
Between 50 microns, for the diameter of inner cladding between 250~800 microns, the diameter of surrounding layer is greater than the diameter of inner cladding, surrounding layer
Diameter between 300~1000 microns；The diameter of the fibre core for the triple clad passive fiber that laser output optical fibre uses 10~
Between 50 microns, inner cladding diameter is between 80~100 microns, and outer cladding diameter is between 110~130 microns.
The embodiment of the invention also provides a kind of fiber gratings, and the optical fiber of fiber grating is using triple clad passive light
Fibre, the triple clad passive fiber include fibre core, the inner cladding being covered on outside fibre core, the surrounding layer being covered on outside inner cladding
With the coat being covered on outside surrounding layer, the cross-sectional shape of fibre core, inner cladding and surrounding layer is circle；The triple clad
The diameter of the fibre core of passive fiber is between 10~50 microns；The diameter of inner cladding between 250~800 microns, surrounding layer
Diameter is greater than the diameter of inner cladding, and the diameter of surrounding layer is between 300~1000 microns.
The embodiment of the invention also provides a kind of optical fiber lasers, including the first pump combiner and the second pumping to close beam
Device, wherein the first pump combiner uses the first pump combiner provided in an embodiment of the present invention, and the second pump combiner is adopted
With second of pump combiner provided in an embodiment of the present invention.
The embodiment of the invention also provides a kind of optical fiber lasers including fiber grating provided in an embodiment of the present invention.
Referring to Fig. 3, optical fiber laser provided in an embodiment of the present invention can specifically include it is sequentially connected in optical path
The first pumping array 1 for being made of multiple first pumping sources, the first pump combiner 2, the first fiber grating 3, the first order are active
Optical fiber 4, the second fiber grating 5, second level Active Optical Fiber 6, the second pump combiner 7, mode stripper 8 and laser export head 9,
It further include the second pumping array being made of multiple second pumping sources being connect with the input terminal optical path of the second pump combiner 7
10。
In embodiments of the present invention, the first pump combiner 2 can be the pump combiner of (18+1) × 1, the second pumping
Bundling device 7 can be the pump combiner of (6+1) × 1.First fiber grating 3 can be use reflectivity range for 85%~
Fiber grating provided in an embodiment of the present invention between 99.5%, the second fiber grating 5, which can be, uses reflectivity range for 8%
Fiber grating provided in an embodiment of the present invention between~22%.
In embodiments of the present invention, the first pumping array 1, which can be, is made of 6 to 18 the first pumping sources.Each
NA (Numerical Aperture, numerical aperture) value of the output pump light of first pumping source is between 0.1~0.22, output
For power between 200~500W, output wavelength has 915nm and two peak values of 975nm.Second pumping array 10 can be by 6
A second pumping source composition.Between 0.1~0.22, output power exists the NA value of the output pump light of each second pumping source
Between 200~500W, output wavelength has 915nm and two peak values of 975nm.
First pump combiner 2 has 18 pump light input optical fibres, 1 input optical fibre and 1 laser output optical fibre,
In 18 pump light input optical fibre parameters it is identical as the output optical fibre parameter of the first pumping source.The output optical fibre of first pumping source with
The pump light input optical fibre of first pump combiner is connected.6 to 18 the first pumping sources are closed by the first pump combiner 2
At the NA value of output pump light later between 0.15~0.4.Second pump combiner 7 have 6 pump light input optical fibres,
1 laser output optical fibre and 1 pumping light output fiber, wherein 6 pump light input optical fibre parameters and the first pumping source is defeated
Optical fiber parameter is identical out.Second pump combiner 7 is connect by laser output optical fibre with 8 optical path of mode stripper；Second pumping
Bundling device 7 is connect by pump light input optical fibre with the second pumping source light path；Second pump combiner 7 passes through pump light output light
Fibre is connect with 6 optical path of second level Active Optical Fiber.
In embodiments of the present invention, first order Active Optical Fiber 4 and second level Active Optical Fiber 6 may each be triple clad active light
It is fine.Mode stripper 8 is identical with the optical fiber parameter of laser export head 9, is all made of large mode field triple clad passive fiber.
Referring to Fig. 4, in embodiments of the present invention, triple clad Active Optical Fiber includes fibre core 20, is covered on 20 outside of fibre core
Inner cladding 21, the coat 23 that is covered on the surrounding layer 22 of the outside of inner cladding 21 and is covered on 22 outside of surrounding layer.Inner cladding
21 cross-sectional shape is octagon, and the cross-sectional shape of fibre core 20, surrounding layer 22 and coat 23 is circle.
Most pump light is reflected on interface of the inner cladding 21 with surrounding layer 22 in triple clad Active Optical Fiber, only
There is a small amount of pump light that can be reflected on the interface of surrounding layer 22 and coat 23；What inner cladding 21 and surrounding layer 22 were constituted
Optical waveguide structure, opposite NA value is between 0.18~0.24；The optical waveguide structure that surrounding layer 22 and coat 23 are constituted, phase
To NA value between 0.4~0.48；Surrounding layer 22 is made of the silica-based glass for adulterating a small amount of fluorine or boron, to reduce pure quartz
Refractive index forms the waveguiding structure of total reflection；The glass material of pure quartz base can at 1200 DEG C steady operation, and it is general
Organic matter surrounding layer can only work at 200 DEG C or less, and long-term stable work temperature is no more than 100 DEG C, and antibody Monoclonal threshold value is opposite
The glass material difference of quartzy base is too many.The waveguiding structure of triple clad Active Optical Fiber can make most of pump light in quartzy base
Outsourcing is reflected on bed boundary, and the pump light that high power density is greatly reduced is anti-on fragile organic matter coating bed boundary
It penetrates, to greatly improve the reliability of entire laser light path.
First order Active Optical Fiber 4 is identical with the optical fiber parameter of second level Active Optical Fiber 6, is all made of triple clad shown in Fig. 4
Active Optical Fiber.The use length of first order Active Optical Fiber 4 is controlled at 2~10 meters, and the use length of second level Active Optical Fiber 6 controls
At 10~40 meters, the sum of optical fiber total length of first order Active Optical Fiber 4 and second level Active Optical Fiber 6 is between 12~50 meters；Compared with
Short first order Active Optical Fiber 4 forms unsaturated absorption in the optical path, the first fiber grating 3 and the second fiber grating 5 it
Between generate 300~1000W laser, the pump light not fully absorbed is together with the laser of generation in second level Active Optical Fiber 6
Adequately absorb and amplify, exports the laser of 2000~6000W.
Referring to Fig. 5, in embodiments of the present invention, large mode field triple clad passive fiber includes fibre core 27, is covered on fibre core
The inner cladding 28 of 27 outsides, the surrounding layer 29 for being covered on 28 outside of inner cladding and the coat 30 for being covered on 29 outside of surrounding layer.
The cross-sectional shape of the fibre core of conventional large mode field double clad passive fiber is circle, and diameter is generally 35~150
Micron, NA value is generally 0.06~0.12, and the cross-sectional shape of covering is circle, and diameter is generally at 335~400 microns；And this
In the large mode field triple clad passive fiber that inventive embodiments use, the cross-sectional shape of fibre core 27 is octagon, surrounding layer 29
Cross-sectional shape be regualr decagon, the cross-sectional shape of inner cladding 28 and coat 30 is circle.
Distance in the cross section octagon of fibre core 27 with respect to two straight flanges is between 50~200 microns, and NA value is 0.18
Between~0.24, the distance big 20~40 of two straight flanges of the diameter of inner cladding 28 between 70~240 microns and than fibre core 27 is micro-
Meter, the distance in the cross section regualr decagon of surrounding layer 29 with respect to two straight flanges is between 360~460 microns.Positive the eight of fibre core 27
Side shape can eliminate the spiral laser of fibre core compared with the circle of the fibre core of conventional large mode field double clad passive fiber, so that
The Energy distribution of hot spot is more uniform；The covering of the regualr decagon of surrounding layer 29 and conventional large mode field double clad passive fiber
Circle is compared, and can effectively avoid forming spiral light in covering, while the relatively large number of plane of regualr decagon is more favorable to
Etching leakage waveguide also may be used to preferably strip covering transmission light and effectively purify light beam and obtain better processing effect
Preferably to handle light echo protection laser；Fibre core of the fibre core 27 compared to conventional large mode field double clad passive fiber, fibre core ruler
Very little and NA value is larger, can effectively reduce optical power density, reduces nonlinear effect and improves laser stability.
Referring to Fig. 6, each planar junction of the surrounding layer for the large mode field triple clad passive fiber that mode stripper uses
At least one waveform etching groove 32 is etched on the bare fibre surface 31 of structure to destroy smooth fully-reflected plane to shell
Except the optical mode in inner cladding；The shape of waveform etching groove 32 can be random.The depth of waveform etching groove 32
Between 5~15 microns, between 5~10 microns, multiple waveform etching grooves 32 can be uniformly to be covered with every width
On one bare fibre surface 31, the groove trough and wave crest difference of waveform etching groove 32 are between 10~30 microns, and adjacent two
The distance between a waveform etching groove 32 is between 5~10 microns.
Assuming that the conventional double-cladding active optical fiber that cladding diameter is 400 microns constructs both-end with core diameter for 25 microns
1500W and the 2000W Optical Maser System of symmetric pump structure, with core diameter for 25 microns, inner cladding diameter is 360 microns,
The triple clad Active Optical Fiber that outer cladding diameter is 420 microns constructs the 2000W Optical Maser System of both-end symmetric pump structure, setting
The absorption of conventional double-cladding active optical fiber and triple clad Active Optical Fiber is 0.4dB/m, then has along Active Optical Fiber length direction
The pumping light power that machine object coat is born is as shown in Figure 7.By observation it can be found that based on conventional double-cladding active light
The 1500W Optical Maser System of the both-end symmetric pump structure of fibre building, the organic matter coat of Active Optical Fiber are held along its length
By power distribution curve 33, in the 2000W laser of the both-end symmetric pump structure constructed based on conventional double-cladding active optical fiber
System, the organic matter coat of Active Optical Fiber bear power distribution curve 34, the building pair of triple clad Active Optical Fiber along its length
The 2000W Optical Maser System of symmetric pump structure is held, the organic matter coat of Active Optical Fiber bears power distribution along its length
In curve 35, triple clad Active Optical Fiber constructs the organic matter coat institute of the 2000W Optical Maser System of both-end symmetric pump structure
The power of receiving is minimum, it is seen that the stability and reliability of its light path system is best.
Triple clad passive fiber is applied in high-capacity optical fiber laser, and the diameter of fibre core is too small, the excessively high meeting of power density
Lead to entire optical path less stable, the diameter of fibre core is too big, beam quality too poor can be unfavorable for processed and applied, inner cladding and outsourcing
Layer all plays a protective role, and too thin protective effect is inadequate, influences heat dissipation and bending property if too thick.In the present invention,
Since triple clad passive fiber includes the surrounding layer being covered on outside inner cladding, the diameter of the fibre core of the triple clad passive fiber
Between 10~50 microns, for the diameter of inner cladding between 250~800 microns, the diameter of surrounding layer is greater than the diameter of inner cladding,
The diameter of surrounding layer is between 300~1000 microns, alternatively, inner cladding diameter is between 80~100 microns, outer cladding diameter exists
Between 110~130 microns.Therefore triple clad passive fiber of the invention is applied in high-capacity optical fiber laser, fibre core it is straight
Diameter can make entire optical path stabilization, be conducive to processed and applied, and the diameter of inner cladding and surrounding layer can preferably play fibre core
Protective effect is radiated with bending property preferable.Be covered on the surrounding layer outside inner cladding drastically reduce pump light for
The damage of organic matter coat, coat is as total reflection interface damage threshold superelevation, to improve the steady of optical fiber laser
Qualitative and reliability.
Again since optical fiber laser includes first order Active Optical Fiber and second level Active Optical Fiber, the first optical fiber is reduced
Grating and the second fiber grating bear the pressure of laser, and are different from traditional MOPA enlarged structure, simplify optical path, additionally it is possible to
Effectively reduce light echo amplification.
Again since beam is closed in the pumping that the first pump combiner and the second pump combiner are all based on triple clad passive fiber
Device, the first fiber grating are to use the reflectivity range based on triple clad passive fiber for the optical fiber light between 85%~99.5%
Grid, the second fiber grating are to use the reflectivity range based on triple clad passive fiber for the fiber grating between 8%~22%；
First order Active Optical Fiber and second level Active Optical Fiber are triple clad Active Optical Fibers；Mode stripper and laser export head are all made of
Large mode field triple clad passive fiber.The surrounding layer of triply coated fiber drastically reduces pump light for the damage of organic matter coat
Wound, coat improve the Stability and dependability of optical fiber laser as total reflection interface damage threshold superelevation.
Again since the output wavelength of the first pumping source and the second pumping source has 915nm and two peak values of 975nm, fill
The absorption characteristic that Active Optical Fiber is utilized divided, has taken into account the high-selenium corn of 975nm and the wide absorption characteristics of 915nm, can be effective
Shortening using Active Optical Fiber length and guaranteed good stability.
Again since the optical fiber of mode stripper and laser export head is all made of large mode field triple clad passive fiber, the cross of fibre core
Cross sectional shape is octagon, and the cross-sectional shape of surrounding layer is regualr decagon, the octagon of fibre core and conventional large mode field
The circle of the fibre core of double clad passive fiber is compared, and the spiral laser of fibre core can be eliminated, so that the Energy distribution of hot spot is more
Uniformly；The regualr decagon of surrounding layer, can be effective compared with the circle of the covering of conventional large mode field double clad passive fiber
It avoids forming spiral light in covering, while the relatively large number of plane of regualr decagon is more favorable to etching leakage waveguide, thus more
Good strips covering transmission light and effectively purifies light beam and obtain better processing effect, can also preferably handle light echo protection
Laser；For fibre core compared to the fibre core of conventional large mode field double clad passive fiber, core size and NA value are larger, can be effective
Optical power density is reduced, nonlinear effect is reduced and improves laser stability.
Each planar structure of the surrounding layer of the large mode field triple clad passive fiber used again due to mode stripper
It is etched at least one waveform etching groove on bare fibre surface, therefore smooth fully-reflected plane can be destroyed to strip
Optical mode in inner cladding avoids typical circular structure and is difficult to position, etch the problem of continuity difference, and implementation simply may be used
By processing easy to automate.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (19)
1. a kind of triple clad passive fiber, which is characterized in that including fibre core, the inner cladding being covered on outside fibre core, be covered in
Surrounding layer outside covering and the coat being covered on outside surrounding layer, the cross-sectional shape of fibre core, inner cladding and surrounding layer are equal
For circle；The diameter of the fibre core of the triple clad passive fiber is between 10~50 microns；
For the diameter of inner cladding between 250~800 microns, the diameter of surrounding layer is greater than the diameter of inner cladding, the diameter of surrounding layer
Between 300~1000 microns, alternatively, inner cladding diameter, between 80~100 microns, outer cladding diameter is at 110~130 microns
Between.
2. a kind of pump combiner, which is characterized in that the laser output optical fibre of pump combiner is using triple clad passive light
Fibre, the triple clad passive fiber include fibre core, the inner cladding being covered on outside fibre core, the surrounding layer being covered on outside inner cladding
With the coat being covered on outside surrounding layer, the cross-sectional shape of fibre core, inner cladding and surrounding layer is circle；The triple clad
The diameter of the fibre core of passive fiber is between 10~50 microns；The diameter of inner cladding between 250~800 microns, surrounding layer
Diameter is greater than the diameter of inner cladding, and the diameter of surrounding layer is between 300~1000 microns.
3. a kind of pump combiner, which is characterized in that the pumping light output fiber and laser output optical fibre of pump combiner use
Be triple clad passive fiber, the triple clad passive fiber include fibre core, the inner cladding being covered on outside fibre core, be covered in
Surrounding layer outside covering and the coat being covered on outside surrounding layer, the cross-sectional shape of fibre core, inner cladding and surrounding layer are equal
For circle；Wherein, the diameter of the fibre core for the triple clad passive fiber that pumping light output fiber uses is interior between 10~50 microns
For the diameter of covering between 250~800 microns, the diameter of surrounding layer is greater than the diameter of inner cladding, the diameter of surrounding layer 300~
Between 1000 microns；The diameter of the fibre core for the triple clad passive fiber that laser output optical fibre uses is interior between 10~50 microns
Cladding diameter is between 80~100 microns, and outer cladding diameter is between 110~130 microns.
4. a kind of fiber grating, which is characterized in that the optical fiber of fiber grating is using triple clad passive fiber, the triple clad
Passive fiber includes fibre core, the inner cladding being covered on outside fibre core, the surrounding layer being covered on outside inner cladding and is covered on outsourcing
The coat of layer outside, the cross-sectional shape of fibre core, inner cladding and surrounding layer is circle；The fibre of the triple clad passive fiber
The diameter of core is between 10~50 microns；For the diameter of inner cladding between 250~800 microns, the diameter of surrounding layer is greater than interior packet
The diameter of layer, the diameter of surrounding layer is between 300~1000 microns.
5. a kind of optical fiber laser, which is characterized in that including the first pump combiner and the second pump combiner, wherein first
Pump combiner uses pump combiner as claimed in claim 2, and the second pump combiner is using as claimed in claim 3
Pump combiner.
6. optical fiber laser as claimed in claim 5, which is characterized in that the optical fiber laser further includes being pumped by multiple first
First pumping array, the first fiber grating, first order Active Optical Fiber, the second fiber grating, second level active light of Pu source composition
Fibre, mode stripper, laser export head and the second pumping array being made of multiple second pumping sources, the first pumping array, the
One pump combiner, the first fiber grating, first order Active Optical Fiber, the second fiber grating, second level Active Optical Fiber, the second pumping
Bundling device, mode stripper and laser export head are sequentially connected in optical path, the input terminal of the second pump combiner and the second pump
The connection of Pu array light path.
7. optical fiber laser as claimed in claim 6, which is characterized in that the first fiber grating is using passive based on triple clad
The reflectivity range of optical fiber is the fiber grating between 85%~99.5%, and the second fiber grating is using passive based on triple clad
The reflectivity range of optical fiber is the fiber grating between 8%~22%；First order Active Optical Fiber and second level Active Optical Fiber are
Triple clad Active Optical Fiber；Mode stripper and laser export head are all made of large mode field triple clad passive fiber.
8. optical fiber laser as claimed in claim 6, which is characterized in that first pump combiner is (18+1) × 1
Pump combiner, the second pump combiner are the pump combiners of (6+1) × 1；First pumping array is by 6 to 18 first
Pumping source composition, what the second pumping array was made of 6 the second pumping sources.
9. optical fiber laser as claimed in claim 6, which is characterized in that the output of each first pumping source and the second pumping source
The NA value of pump light is between 0.1~0.22, and for output power between 200~500W, output wavelength has 915nm and 975nm
Two peak values.
10. optical fiber laser as claimed in claim 8, which is characterized in that the first pump combiner has 18 pump lights defeated
Enter optical fiber, 1 input optical fibre and 1 laser output optical fibre, wherein 18 pump light input optical fibre parameters and the first pumping source
Output optical fibre parameter is identical；The output optical fibre of first pumping source is connected with the pump light input optical fibre of the first pump combiner；
Second pump combiner has 6 pump light input optical fibres, 1 laser output optical fibre and 1 pumping light output fiber,
In 6 pump light input optical fibre parameters it is identical as the output optical fibre parameter of the first pumping source；Second pump combiner passes through laser
Output optical fibre is connect with mode stripper optical path；Second pump combiner passes through pump light input optical fibre and the second pumping source light path
Connection；Second pump combiner is connect by pumping light output fiber with second level Active Optical Fiber optical path.
11. optical fiber laser as claimed in claim 7, which is characterized in that the first fiber grating and the second fiber grating use
Triple clad passive fiber include fibre core, the inner cladding being covered on outside fibre core, the surrounding layer being covered on outside inner cladding and cover
Cover the coat outside surrounding layer；The cross-sectional shape of fibre core, inner cladding and surrounding layer is circle, and the triple clad is passive
The diameter of the fibre core of optical fiber is between 10~50 microns, and the diameter of inner cladding is between 250~800 microns, the diameter of surrounding layer
Greater than the diameter of inner cladding, the diameter of surrounding layer is between 300~1000 microns.
12. the optical fiber laser as described in claim 7 or 11, which is characterized in that the triple clad Active Optical Fiber include fibre core,
It is covered on the inner cladding outside fibre core, the surrounding layer being covered on outside inner cladding and the coat being covered on outside surrounding layer；It is interior
The cross-sectional shape of covering is octagon, and the cross-sectional shape of fibre core, surrounding layer and coat is circle；Surrounding layer is by mixing
The silica-based glass of miscellaneous fluorine or boron composition.
13. optical fiber laser as claimed in claim 12, which is characterized in that the inner cladding of the triple clad Active Optical Fiber and outer
The optical waveguide structure that covering is constituted, opposite NA value is between 0.18~0.24；The optical waveguide knot that surrounding layer and coat are constituted
Structure, opposite NA value is between 0.4~0.48.
14. optical fiber laser as claimed in claim 7, which is characterized in that the use length of the first order Active Optical Fiber is 2
Between~10 meters, for the use length of second level Active Optical Fiber between 10~40 meters, first order Active Optical Fiber and the second level are active
The sum of optical fiber total length of optical fiber is between 12~50 meters.
15. optical fiber laser as claimed in claim 7, which is characterized in that
Large mode field triple clad passive fiber include fibre core, the inner cladding being covered on outside fibre core, be covered on it is outer outside inner cladding
Covering and the coat being covered on outside surrounding layer；In large mode field triple clad passive fiber, the cross-sectional shape of fibre core is positive eight
Side shape, the cross-sectional shape of surrounding layer are regualr decagon, and the cross-sectional shape of inner cladding and coat is circle.
16. optical fiber laser as claimed in claim 15, which is characterized in that the fibre core of the large mode field triple clad passive fiber
Cross section octagon in respect to two straight flanges distance between 50~200 microns, NA value is between 0.18~0.24, interior packet
The distance of two straight flanges of the diameter of layer between 70~240 microns and than fibre core is 20~40 microns big, and the cross section of surrounding layer is just
Distance in decagon with respect to two straight flanges is between 360~460 microns.
17. optical fiber laser as claimed in claim 15, which is characterized in that the large mode field three guarantees that the mode stripper uses
At least one waveform etching groove is etched on the bare fibre surface of each planar structure of the surrounding layer of layer passive fiber.
18. optical fiber laser as claimed in claim 17, which is characterized in that the shape of the waveform etching groove is random
's；
The depth of waveform etching groove is between 5~15 microns, and for width between 5~10 microns, multiple waveforms etch ditch
Slot is uniformly covered on each bare fibre surface, and the groove trough and wave crest difference of waveform etching groove are micro- 10~30
Between rice, the distance between two neighboring waveform etching groove is between 5~10 microns.
19. a kind of optical fiber laser, which is characterized in that including fiber grating as described in claim 4 or 5.
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| CN201910570517.7A CN110187437B (en) | 2019-06-27 | 2019-06-27 | Three-cladding optical fiber, pump beam combiner, fiber grating and fiber laser |
| PCT/CN2020/098330 WO2020259643A1 (en) | 2019-06-27 | 2020-06-26 | Triple-clad fiber, pump combiner, fiber grating, and fiber laser |
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| CN201910570517.7A CN110187437B (en) | 2019-06-27 | 2019-06-27 | Three-cladding optical fiber, pump beam combiner, fiber grating and fiber laser |
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| CN111817117A (en) * | 2020-06-11 | 2020-10-23 | 中国科学院西安光学精密机械研究所 | Optical fiber laser pumping coupling system and method based on pumping cache gain optical fiber |
| WO2020259644A1 (en) * | 2019-06-27 | 2020-12-30 | 苏州创鑫激光科技有限公司 | Large-mode-area triple-clad passive fiber, mode stripper and fiber laser |
| WO2020259642A1 (en) * | 2019-06-27 | 2020-12-30 | 苏州创鑫激光科技有限公司 | Triple-clad active optical fibre, optical amplification structure, and optical fibre laser |
| WO2020259643A1 (en) * | 2019-06-27 | 2020-12-30 | 苏州创鑫激光科技有限公司 | Triple-clad fiber, pump combiner, fiber grating, and fiber laser |
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| WO2020259643A1 (en) | 2020-12-30 |
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