CN107608021A - One kind mixes all solid state band gap type microstructured optical fibers of bismuth - Google Patents
One kind mixes all solid state band gap type microstructured optical fibers of bismuth Download PDFInfo
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- CN107608021A CN107608021A CN201710950826.8A CN201710950826A CN107608021A CN 107608021 A CN107608021 A CN 107608021A CN 201710950826 A CN201710950826 A CN 201710950826A CN 107608021 A CN107608021 A CN 107608021A
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Abstract
The invention discloses one kind to mix all solid state band gap type microstructured optical fibers of bismuth, including substrate, fibre core and covering dielectric posts array；For base material to adulterate the quartz glass of a certain amount of germanium dioxide, its refractive index is n1；The fibre core is the quartz glass of bismuth element and germanium dioxide co-doped, ensures that its refractive index is identical with base material refractive index by the doping ratio for adjusting two kinds of elements, is also n1；Its a diameter of d1；Covering dielectric posts array is cylindrical type dielectric posts array composition by regular hexagon arrangement of the m layers around the fibre core, and 5≤m≤7, dielectric posts refractive index is n2, and n2>n1；The diameter of dielectric posts is d2；The spacing of two dielectric posts is Λ in covering dielectric posts array；The optical fiber is band gap type microstructured optical fibers, and pump light is located at two different bandgap centers respectively from fluorescence, and Raman diffused light is located at band gap edge.The present invention can effectively filter out the Raman diffused light of pumping, so as to reach the purpose for suppressing pump light Ramam effect, can be used for bismuth doped fiber laser.
Description
Technical field
The invention belongs to optical fiber fabrication technical field, is related to optical fiber laser doped gain fiber structure design, especially
It is related to one kind and mixes all solid state band gap type microstructured optical fibers of bismuth.
Background technology
Optical fiber laser is a kind of very important laser, and most common is exactly the gain light using rare earth doped element
Fibre makes optical fiber laser.Be usually used in doped gain fiber rare earth element include neodymium (Nd), ytterbium (Yb), praseodymium (Pr), thulium (Tm),
Five kinds of erbium (Er), above-mentioned five kinds of rare earth elements have respective specific luminescence band, but can not produce wavelength at 1460 nanometers
The laser of (1389-1538 nanometers) nearby.The blank of laser can not be produced in order to fill up 1460 nm wave bands, it has been proposed that
The gain fibre of doping major element bismuth and accordingly mix bismuth optical fiber laser.
The uniformity for mixing bismuth concentration in bismuth optical fiber directly determines the performance for mixing bismuth optical fiber laser, but due to bismuth
Boiling point far below prefabricated rods contracting rod temperature and optical fiber draw temperature, therefore, mix and bismuth light mixed in bismuth fiber ring laser system
The concentration of bismuth ion is low in fibre, causes to mix bismuth optical fiber low to the absorption efficiency of pump light.It is defeated in order to obtain the laser of equal-wattage
Go out, the length for mixing bismuth gain fibre is the decades of times of rare earth doped element gain fibre.What Yoonchan Jeong et al. were built
Ytterbium-doping optical fiber laser is in the continuous wave of the neighbouring kilowatt output level of 1.1 microns of wavelength, and used fiber lengths are less than 10 meters, together
Shi Jiguang slopes be more than 80% [Lasers and Electro-Optics.IEEE, 2004:2pp.vol.1], and
The power output of S.V.Firstov et al. structures is that 20W mixes bismuth optical fiber laser, and what is used mixes bismuth optical fiber, bismuth element it is dense
Degree is only 0.02%, and fiber lengths have reached 93 meters, lasing efficiency be 50% [Quantum Electron, 2011,41 (7),
581].Existing to mix bismuth gain fibre, either step change type mixes bismuth optical fiber and still mixes bismuth microstructured optical fibers, in terms of guide-lighting mechanism
Full-internal reflection type is belonged to, the light of each wave band can be transferred through optical fiber basic mode and be conducted, the optical band of conduction is not selected
Property.Because fiber lengths are grown, pump light absorption efficiency is low and the wavelength to conducting light is without selectivity, mixes bismuth optical fiber laser system
In system, pump light can produce red shift Raman diffused light when being transmitted in mixing bismuth optical fiber because of the effect of excited Raman,
The output wavelength that N.K.Thipparapu et al. is built only has for the delivery efficiency for mixing bismuth optical fiber laser of 1360 nms
11% [The Workshop on Specialty Optical Fibers ＆ TheirApplications, 2015].
The content of the invention
For above-mentioned the shortcomings of the prior art, the present invention provides one kind and mixes bismuth band gap type microstructured optical fibers, Neng Gouyou
Effect filters out the Raman diffused light of pumping, and so as to reach the purpose for suppressing pump light Ramam effect, this optical fiber can be used for bismuth doping
Optical fiber laser.
In order to solve above-mentioned technical problem, the present invention is achieved by the following technical solutions：
One kind mixes all solid state band gap type microstructured optical fibers of bismuth, including substrate, fibre core and covering dielectric posts array；The substrate
For material to adulterate the quartz glass of a certain amount of germanium dioxide, its refractive index is n1；The fibre core is that bismuth element and germanium dioxide are total to
With the quartz glass of doping, ensure that its refractive index is identical with base material refractive index by the doping ratio for adjusting two kinds of elements,
Also it is n1；Its a diameter of d1；The covering dielectric posts array is cylindrical type by regular hexagon arrangement of the m layers around the fibre core
Dielectric posts array forms, and 5≤m≤7, dielectric posts refractive index is n2, and n2>n1；The diameter of dielectric posts is d2；Intercolumniation is
Λ, the intercolumniation are exactly the spacing in any two adjacent media post center of circle in covering dielectric posts array；The optical fiber is band gap
Type microstructured optical fibers, pump light are located at two different bandgap centers respectively from fluorescence, and Raman diffused light is located at band gap edge.
Further, the refractive index n of the substrate and fibre core1Scope be 1.452~1.455.
Further, the core diameter d1Scope be 13~14 microns.
Further, the covering dielectric posts high index of refraction post refractive index n2Scope be 0.045≤n2-n1≤0.053。
Further, the covering medium column diameter d2Scope be 6.060~6.180 microns.
Further, the scope of the intercolumniation Λ is 10.1~10.3 microns.
The present invention has the advantages that compared with prior art：
Consolidate band gap type microstructured optical fibers entirely to mix bismuth the present invention relates to optical fiber, there are two band gap in designed wave band,
The width of band gap and position are adjusted by adjusting optical fiber structure parameter, makes 1340 nanometers of pump light and 1460 nanometers of laser
The center of different band gap is respectively at, ensures that it low-loss transmission and can produce laser.On this basis by pump light
Wavelength where corresponding Raman diffused light is placed on the marginal position of band gap, increase the loss of Raman diffused light, is suppressed with this
The performance of bismuth optical fiber laser is mixed in the Ramam effect of pump light, enhancing.The present invention can effectively filter out the Raman diffused light of pumping,
So as to reach the purpose for suppressing pump light Ramam effect, it can be used for bismuth doped fiber laser.
Brief description of the drawings
Fig. 1 is the optical fiber structure schematic cross-section of the embodiment of the present invention 1.
Fig. 2 is the band gap of the embodiment of the present invention 1, pattern effective refractive index and mould field figure.
Fig. 3 is the loss figure of the embodiment of the present invention 1.
Fig. 4 is the optical fiber structure schematic cross-section of the embodiment of the present invention 2.
In figure：1- substrates, 2- coverings dielectric posts, 3- fibre cores, 4- intercolumniations, 5- pump lights region, 6- optical-fiber lasers region.
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings：
Illustrate the principle of the present invention with reference to Fig. 1.Fig. 1 gives the optical fiber structure section signal of the embodiment of the present invention 1
Figure.Fibre core 3 is mixes bismuth region, for producing laser in the presence of pump light.Covering dielectric posts 2 is on the base 1 around fibres
The dielectric posts array of five layers of regular hexagon arrangement of core, the refractive index of covering dielectric posts 2 are higher than the refractive index of substrate 1, therefore shape
The microstructured optical fibers guide-lighting into band gap type., can be to band gap by adjusting the diameter dimension and refractive index size of covering dielectric posts 2
Width and position be adjusted, pump light and laser is located at different bandgap centers respectively, be located at Raman diffused light
The edge of band gap, increase the loss of Raman diffused light.
The band gap of band gap fiber is calculated using plane wave expansion method, the pattern effective refractive index of optical fiber is calculated with multipole method,
The band gap and mode refractive index curve map of optical fiber are obtained, while also has the mould field figure in 1460 nanometers, as shown in Figure 2.In figure
Band gap is used for conducting pump light at shortwave, and the band gap at long wave is used for conducting laser, and the Raman diffused light of pump light is positioned at length
Wavestrip gap edge, the loss of such laser will be lower than pump light Raman diffused light.Existed simultaneously by the way that optical fiber has been calculated
Loss figure in 1.0-1.7 micron wavebands, loss figure are as shown in Figure 3.
Embodiment one：
In one kind shown in Fig. 1 mixes all solid state band gap type microstructured optical fibers schematic diagram of bismuth, substrate 1 is Ge-doped pure stone
English glass, its refractive index are 1.452；Fibre core 3 ensures its refractive index by adulterating two kinds of elements of bismuth and germanium in pure quartz glass
It is identical with substrate 1, it is 1.452；3 a diameter of 14 microns of the fibre core of optical fiber；Intercolumniation 4 is 10.3 microns, medium in fibre cladding
2 a diameter of 6.180 microns of post；The refractive index of fibre cladding dielectric posts 2 is 1.5；The number of plies of fibre cladding is 5 layers.Optical fiber is 1460
The loss of nanometers is 0.038dB/m.
Embodiment two：
The all solid state band gap type microstructured optical fibers of bismuth are mixed in one kind shown in Fig. 4, substrate 1 is Ge-doped pure quartz glass,
Refractive index is 1.455；Fibre core 3 adulterates bismuth two kinds of elements of germanium, refractive index 1.455；3 a diameter of 13 microns of fibre core；Intercolumniation 4 is
10.1 microns；2 a diameter of 6.06 microns of dielectric posts in fibre cladding；The refractive index of dielectric posts 2 is 1.50 in fibre cladding；Optical fiber bag
The number of plies of layer is 6 layers.Optical fiber is 0.026dB/m in the loss of 1460 nanometers.
Above-mentioned accompanying drawing is only explanatory view, and protection scope of the present invention is not formed and limited.It should be understood that these realities
Apply that example is of the invention solely for the purpose of illustration, rather than the scope limiting the invention in any way.
Claims (6)
1. one kind mixes all solid state band gap type microstructured optical fibers of bismuth, it is characterised in that：The optical fiber includes substrate, fibre core and covering and is situated between
Matter post array；For the base material to adulterate the quartz glass of a certain amount of germanium dioxide, its refractive index is n1；The fibre core is bismuth
The quartz glass of element and germanium dioxide co-doped, its refractive index and substrate are ensured by the doping ratio for adjusting two kinds of elements
Refractive Index of Material is identical, is also n1；Its a diameter of d1；The covering dielectric posts array is that m layers press positive six side around the fibre core
The cylindrical type dielectric posts array composition of shape arrangement, 5≤m≤7, dielectric posts refractive index is n2, and n2＞ n1；Dielectric posts it is straight
Footpath is d2；Intercolumniation is Λ, and the intercolumniation is exactly in covering dielectric posts array between any two adjacent media post center of circle
Away from；The optical fiber is band gap type microstructured optical fibers, and pump light is located at two different bandgap centers, Raman scattering respectively from fluorescence
Light is located at band gap edge.
2. one kind according to claim 1 mixes all solid state band gap type microstructured optical fibers of bismuth, it is characterised in that：The substrate and
The refractive index n of fibre core1Scope be 1.452~1.455.
3. one kind according to claim 1 mixes all solid state band gap type microstructured optical fibers of bismuth, it is characterised in that：The fibre core is straight
Footpath d1Scope be 13~14 microns.
4. one kind according to claim 1 mixes all solid state band gap type microstructured optical fibers of bismuth, it is characterised in that：The covering is situated between
Matter pillar height refractive index post refractive index n2Scope be 0.045≤n2-n1≤0.053。
5. one kind according to claim 1 mixes all solid state band gap type microstructured optical fibers of bismuth, it is characterised in that：The covering is situated between
Matter column diameter d2Scope be 6.060~6.180 microns.
6. one kind according to claim 1 mixes all solid state band gap type microstructured optical fibers of bismuth, it is characterised in that：The intercolumniation
Λ scope is 10.1~10.3 microns.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710950826.8A CN107608021B (en) | 2017-10-13 | 2017-10-13 | Bismuth-doped all-solid-state band gap type microstructure optical fiber |
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| CN201710950826.8A CN107608021B (en) | 2017-10-13 | 2017-10-13 | Bismuth-doped all-solid-state band gap type microstructure optical fiber |
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| CN107608021B CN107608021B (en) | 2020-05-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112723751A (en) * | 2020-10-23 | 2021-04-30 | 南京同溧晶体材料研究院有限公司 | Rare earth doped bismuth germanate single crystal optical fiber and cladding method |
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| CN1883085A (en) * | 2003-11-19 | 2006-12-20 | 康宁股份有限公司 | Active photonic band-gap optical fiber |
| CN103038682A (en) * | 2010-09-28 | 2013-04-10 | 株式会社藤仓 | Solid photonic band gap fiber, and fiber module, fiber amp, and fiber laser employing solid photonic band gap fiber |
| CN103645536A (en) * | 2013-12-18 | 2014-03-19 | 江苏大学 | All-solid LMA (large mode area) photonic band gap optical fiber |
| CN103880279A (en) * | 2014-02-26 | 2014-06-25 | 中国科学院上海光学精密机械研究所 | Method for preparing all solid-state band gap-type photonic crystal fiber of multi-component glass |
| CN105009387A (en) * | 2013-03-14 | 2015-10-28 | 株式会社藤仓 | Photonic bandgap fiber and fiber laser device using same |
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2017
- 2017-10-13 CN CN201710950826.8A patent/CN107608021B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1883085A (en) * | 2003-11-19 | 2006-12-20 | 康宁股份有限公司 | Active photonic band-gap optical fiber |
| CN103038682A (en) * | 2010-09-28 | 2013-04-10 | 株式会社藤仓 | Solid photonic band gap fiber, and fiber module, fiber amp, and fiber laser employing solid photonic band gap fiber |
| CN105009387A (en) * | 2013-03-14 | 2015-10-28 | 株式会社藤仓 | Photonic bandgap fiber and fiber laser device using same |
| CN103645536A (en) * | 2013-12-18 | 2014-03-19 | 江苏大学 | All-solid LMA (large mode area) photonic band gap optical fiber |
| CN103880279A (en) * | 2014-02-26 | 2014-06-25 | 中国科学院上海光学精密机械研究所 | Method for preparing all solid-state band gap-type photonic crystal fiber of multi-component glass |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112723751A (en) * | 2020-10-23 | 2021-04-30 | 南京同溧晶体材料研究院有限公司 | Rare earth doped bismuth germanate single crystal optical fiber and cladding method |
| CN112723751B (en) * | 2020-10-23 | 2022-03-11 | 南京同溧晶体材料研究院有限公司 | Rare earth doped bismuth germanate single crystal optical fiber and cladding method |
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