CN102289031B - Method for improving optical fiber self-focusing threshold power and optical fiber - Google Patents
Method for improving optical fiber self-focusing threshold power and optical fiber Download PDFInfo
- Publication number
- CN102289031B CN102289031B CN201110162464.9A CN201110162464A CN102289031B CN 102289031 B CN102289031 B CN 102289031B CN 201110162464 A CN201110162464 A CN 201110162464A CN 102289031 B CN102289031 B CN 102289031B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- doped core
- threshold power
- focusing threshold
- self
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005253 cladding Methods 0.000 claims description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 239000000835 fiber Substances 0.000 abstract description 12
- 230000003287 optical effect Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000005350 fused silica glass Substances 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
- 230000005374 Kerr effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Landscapes
- Lasers (AREA)
Abstract
The invention discloses a method for improving optical fiber self-focusing threshold power and an optical fiber, and relates to the technical field of laser transmission. In the method, the doping density of a doped fiber core (3) of the optical fiber is increased progressively from the center to the outside. The method can improve the self-focusing threshold power of a gain optical fiber, reduce the optical damage to the material, and improve the amplifying ability of a single fiber laser system.
Description
Technical field
The present invention relates to optical-fiber laser transmission and amplifying technique field, relate in particular to a kind of method and optical fiber that utilizes the horizontal dopant profiles of gain fibre to improve optical fiber self-focusing threshold power.
Background technology
In laser medium, after laser intensity surpasses certain level, can bring out the Kerr effect in medium, the refractive index of medium and light intensity are linear, and this linear scale factor is nonlinear refraction rate coefficient n
2.
Owing to conventionally adopting basic mode optical field distribution (approximate Gaussian distribution) in practical application, in nonlinear refraction rate coefficient is positive material, the refractive index of the region impression that center light is powerful is larger, the refractive index of the region impression that around light intensity is little is less, cause thus light beam to converge to central optical axis, when this converges effect while surpassing the diffraction effect of light beam, self-focusing occurs, cause focus place light intensity very big, thus the optical damage of inducing materials.
And, because fused quartz material is to 1 micron of optical maser wavelength, its typical n
2resulting self focusing threshold is about 4.3MW, in fibre-optic waveguide structure, although index guide structure can produce certain impact to beam Propagation, but numerical simulation and experimental result all show, the self-focusing threshold power of the self-focusing threshold power of optical fiber and fused quartz bulk material is basic identical, limited thus the amplifying power of optical fiber laser amplifier, in optical fiber laser amplifier, in 10ns pulsewidth, obtain at the most the pulse energy of 43mJ, than the solid laser system obtainable pulse peak power of institute and energy, still have suitable gap.
While amplifying in gain fibre due to laser, there is saturation effect, especially, transverse spatial distribution is existed to horizontal gain saturation effect, less to the higher region gain of light intensity, and larger to the lower region gain of light intensity.For Gaussian distribution light field, high, low around in the middle of light intensity, laterally gain saturation effect makes light field be tending towards therefrom mind-set peripheral region expansion, has been equivalent to strengthen the beam spread effect of diffraction effect.Strengthen this horizontal gain saturation effect and can improve self-focusing threshold power.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: a kind of method and optical fiber that improves optical fiber self-focusing threshold power is provided, and it can improve the self-focusing threshold power of gain fibre, reduces the optical damage to material, improves the amplifying power of single fiber laser system.
(2) technical scheme
For addressing the above problem, the invention provides a kind of method that improves optical fiber self-focusing threshold power, comprising: the doping content of the doped core of optical fiber is outwards increased progressively by center.
Wherein, the height of the doping content of described doped core and the size of refractive index are directly proportional.
Wherein, the doping ion of described doped core is rare earth ion.
Wherein, the doping ion distribution mode of described doped core is gradient ramp type.
Wherein, described gradient ramp type comprises: parabolic type, Gaussian or hyperbolic secant line style.
Wherein, the doping ion distribution mode of described doped core is triangular form.
Wherein, the doping ion distribution mode of described doped core is multistage step change type.
An optical fiber of realizing the raising optical fiber self-focusing threshold power of preceding method, comprises surrounding layer, inner cladding and doped core, and the doping content of doped core is outwards increased progressively by center.
(3) beneficial effect
The present invention is by making the doping content of the doped core of optical fiber outwards be increased progressively by center, strengthened horizontal gain saturation effect when laser amplifies in gain fibre, thereby improved the self-focusing threshold power of gain fibre, reduce the optical damage to material, improved the amplifying power of single fiber laser system.
Accompanying drawing explanation
Fig. 1 improves the structural drawing of the optical fiber of optical fiber self-focusing threshold power described in the embodiment of the present invention;
Fig. 2 is the doping ion distribution figure that is the doped core of triangular form distribution in the embodiment of the present invention;
Fig. 3 is the doping ion distribution figure that is the doped core of gradient ramp type distribution in the embodiment of the present invention;
Fig. 4 is the doping ion distribution figure that is the doped core of multistage step change type distribution in the embodiment of the present invention.
Wherein, 1: surrounding layer, 2: inner cladding, 3: doped core.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
The method of raising optical fiber self-focusing threshold power of the present invention, comprising: the doping content of the doped core 3 of optical fiber is outwards increased progressively by center.
The height of the doping content of described doped core is directly proportional to the size of refractive index.
The doping ion distribution mode of described doped core is: gradient ramp type, triangular form or multistage step change type, gradient ramp type comprises parabolic type, Gaussian or hyperbolic secant line style.
For example the doping ion distribution mode of doped core is triangular form, as shown in Figure 2, wherein, a
1, a
2and a
3the radius that represents respectively fibre core, inner cladding and the surrounding layer of optical fiber.
As shown in Figure 3, the doping ion distribution mode of doped core is gradient ramp type, wherein, and a
1, a
2and a
3the radius that represents respectively fibre core, inner cladding and the surrounding layer of optical fiber.
As shown in Figure 4, the doping ion distribution mode of doped core is multistage step change type, wherein, and a
1, a
2and a
3the radius that represents respectively fibre core, inner cladding and the surrounding layer of optical fiber.
As shown in Figure 1, the optical fiber of raising optical fiber self-focusing threshold power of the present invention, comprises surrounding layer 1, inner cladding 2 and doped core 3, and the doping content of doped core 3 is outwards increased progressively by center.
Above embodiment is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (5)
1. a method that improves optical fiber self-focusing threshold power, is characterized in that, comprising: the doping content of the doped core (3) of optical fiber is outwards increased progressively by center; The doping ion of described doped core is rare earth ion;
The height of the doping content of described doped core is directly proportional to the size of refractive index;
Described optical fiber comprises surrounding layer (1), inner cladding (2) and doped core (3), and the doping content of doped core (3) is outwards increased progressively by center.
2. the method for raising optical fiber self-focusing threshold power as claimed in claim 1, is characterized in that, the doping ion distribution mode of described doped core is gradient ramp type.
3. the method for raising optical fiber self-focusing threshold power as claimed in claim 2, is characterized in that, described gradient ramp type comprises: parabolic type, Gaussian or hyperbolic secant line style.
4. the method for raising optical fiber self-focusing threshold power as claimed in claim 1, is characterized in that, the doping ion distribution mode of described doped core is triangular form.
5. the method for raising optical fiber self-focusing threshold power as claimed in claim 1, is characterized in that, the doping ion distribution mode of described doped core is multistage step change type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110162464.9A CN102289031B (en) | 2011-06-16 | 2011-06-16 | Method for improving optical fiber self-focusing threshold power and optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110162464.9A CN102289031B (en) | 2011-06-16 | 2011-06-16 | Method for improving optical fiber self-focusing threshold power and optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102289031A CN102289031A (en) | 2011-12-21 |
| CN102289031B true CN102289031B (en) | 2014-03-12 |
Family
ID=45335582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110162464.9A Expired - Fee Related CN102289031B (en) | 2011-06-16 | 2011-06-16 | Method for improving optical fiber self-focusing threshold power and optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102289031B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257394B (en) * | 2013-04-26 | 2015-01-14 | 中国人民解放军国防科学技术大学 | Gain optical fiber for outputting specific single-mode lasers |
| CN105068179B (en) * | 2015-08-31 | 2017-11-17 | 中国科学院半导体研究所 | Optical fiber structure containing metal |
| CN110398802B (en) * | 2019-08-01 | 2021-01-29 | 中国工程物理研究院激光聚变研究中心 | Optical fiber manufacturing method |
| CN114280721B (en) * | 2021-12-31 | 2023-04-07 | 长飞光纤光缆股份有限公司 | anti-Gaussian energy transmission optical fiber and application thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6018533A (en) * | 1995-04-21 | 2000-01-25 | Ceramoptec Industries, Inc. | Optical fiber and integrated optic lasers with enhanced output power |
| NL1028153C2 (en) * | 2005-01-28 | 2006-07-31 | Draka Comteq Bv | Transmission fiber with optical amplification and method for manufacturing thereof. |
| US7130514B1 (en) * | 2005-06-15 | 2006-10-31 | Corning Incorporated | High SBS threshold optical fiber |
| US7356232B1 (en) * | 2006-08-01 | 2008-04-08 | Furukawa Electric North America | Optical fibers for high power applications |
-
2011
- 2011-06-16 CN CN201110162464.9A patent/CN102289031B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102289031A (en) | 2011-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6306624B2 (en) | Fiber that provides double-clad gain with increased cladding absorption while maintaining single-mode operation | |
| JP4511831B2 (en) | High numerical aperture optical fiber, its manufacturing method and its use | |
| US10644475B2 (en) | Random distributed Rayleigh feedback fiber laser based on double-cladding weakly ytterbium-doped fiber | |
| CN102289031B (en) | Method for improving optical fiber self-focusing threshold power and optical fiber | |
| CN104092087A (en) | High-energy short-pulse fiber laser amplifier | |
| CN103746283A (en) | Method for improving pumping efficiency of fiber laser and fiber laser thereof | |
| CN103257394B (en) | Gain optical fiber for outputting specific single-mode lasers | |
| WO2020259644A1 (en) | Large-mode-area triple-clad passive fiber, mode stripper and fiber laser | |
| CN103474867A (en) | Large-mode-area high-power fiber laser device | |
| CN103490271A (en) | Optical fiber and fiber laser comprising optical fiber | |
| CN105403951A (en) | Hollow-solid composite multi-core photonic crystal fiber and laser amplifying method thereof | |
| CN103487879B (en) | A kind of seven core photonic crystal fibers suppressing high-order super model to export | |
| CN108459371B (en) | Ytterbium-doped polarization maintaining optical fiber | |
| US9225142B2 (en) | Fiber amplifier with multi section core | |
| CN203674547U (en) | Pump efficiency enhancing type optical fiber laser | |
| CN106772780B (en) | Photonic crystal fiber with slow light characteristic | |
| JP6306637B2 (en) | Fiber that provides gain with increased cladding absorption while maintaining single mode operation | |
| CN102207580B (en) | Laser amplification optical fiber for preventing self-convergence damage | |
| CN203387042U (en) | Erbium-ytterbium co-doped fiber laser capable of inhibiting Yb-ASE | |
| EP4150387A1 (en) | Large-mode-area optical fibers and optical fiber amplifiers in the eye-safe regime | |
| CN203406497U (en) | Large mode field area high power fiber laser apparatus | |
| CN210720804U (en) | Ytterbium-doped double-clad optical fiber with gradually-changed inner cladding | |
| Alkeskjold | Single-mode large-mode area fiber amplifier with higher-order mode suppression and distributed passband filtering of ASE and SRS | |
| CN114035263B (en) | Photonic band gap optical fiber of Lailo triangle low refractive index rod | |
| Yablon et al. | Fiber designs for exceeding the bulk-media self-focusing threshold |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 |