CN103777271A - Fiber, fiber oscillator and fiber amplifier - Google Patents
Fiber, fiber oscillator and fiber amplifier Download PDFInfo
- Publication number
- CN103777271A CN103777271A CN201310616937.7A CN201310616937A CN103777271A CN 103777271 A CN103777271 A CN 103777271A CN 201310616937 A CN201310616937 A CN 201310616937A CN 103777271 A CN103777271 A CN 103777271A
- Authority
- CN
- China
- Prior art keywords
- fiber
- optical fiber
- pump light
- along
- core
- 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.)
- Pending
Links
Images
Abstract
The invention provides a fiber, and a fiber oscillator and a fiber amplifier which apply the fiber. The fiber is a gain fiber and is composed of a fiber core, an inner wrapping layer and an outer wrapping layer. The cross section of the fiber core maintains unchanged along the axial direction of the fiber; and the area of the cross section of the inner wrapping layer gradually changes along with the axial direction of the fiber from one incident end of pump light to the exiting end of the pump light such that the inner wrapping layer, along the axial direction of the fiber, becomes a cone which has a greater area of the cross section of the incident end of the pump light and a smaller area of the cross section of the exiting end of the pump light. The cone-shaped fiber can obtain uniform absorption of the power of the pump light.
Description
Technical field
The present invention relates to light guide techniques field, relate in particular to optical fiber, optical fiber oscillator and fiber amplifier.
Background technology
For optical fiber oscillator and the amplifier of end pumping, the absorption techniques of pump power is a gordian technique that improves its output power.End pumping coupling technique is the conventional coupling scheme of high-power fiber amplifier, the advantages such as transformation efficiency is high, easy realization that it has.
At present, for common double cladded-fiber, core diameter be subject to basic mode requirement restriction and can not be too large, if the unconfined increase of inner cladding diameter of optical fiber will reduce pump absorption, therefore the inner cladding diameter of common double cladded-fiber can limit the pump power of initial incident, finally limits the output power of end pumping fiber laser.Recently, a kind of active conical fiber is suggested as the fiber laser and amplifier of gain media, because the wide end part of this conical fiber has large covering cross section, therefore it can be by low-light level, high-power laser diode-pumped, the requirement that the core diameter of its narrow end part is exported to meet basic mode compared with I simultaneously.
But the covering of this common conical fiber and fibre core present identical conical by its shape, the diameter ratio that is covering and fibre core is constant, this has just caused the absorption of pump power is heterogeneous along fiber lengths, the absorption of pumping light power is mainly concentrated on to pumping end surface place, this will cause the problem such as fire damage, nonlinear effect, thereby finally affects the raising of output power and the stability of device.
Summary of the invention
(1) technical matters solving
For the deficiencies in the prior art, the invention provides the optical fiber of the tapered structure of a kind of covering, can realize pump power is evenly absorbed.
(2) technical scheme
In order to realize above object, the present invention is achieved by the following technical programs:
A kind of optical fiber, comprising: fibre core, inner cladding and surrounding layer.Wherein, the xsect of fibre core is along fiber axis to remaining unchanged; The cross-sectional area of inner cladding from one end of pump light incident to one end of pump light outgoing along fiber axis to gradually changing, thereby inner cladding is along fiber axis to the large and little centrum of one end cross-sectional area of pump light outgoing of one end cross-sectional area that becomes pump light incident.
Wherein, described optical fiber is gain fibre.
Wherein, described fibre core belongs to doped core, on fiber core doped with erbium, ytterbium, thulium and neodymium wherein one or more.
Wherein, the type of the index distribution of fibre core is the wherein one in step shape, shoulder shape, A shape, parabolical, W shape.
Wherein, described cone is symmetrical straight line or camber line along two sides of optical fiber axial section, and described cone is along central shaft Rotational Symmetry.
A kind of optical fiber oscillator, comprises above-mentioned optical fiber.
A kind of fiber amplifier, comprises above-mentioned optical fiber.
(3) beneficial effect
The present invention at least has following beneficial effect:
1, the feature of this optical fiber is: fiber core cross section is along fiber axis to constant, and the area in inner cladding and surrounding layer cross section is along fiber axis to reducing gradually, and the area ratio of fibre core and inner cladding is along fiber axis to increasing gradually.Therefore the from then on large end face injection of optical fiber of pump light, reduce gradually to cause the pump light of absorption to reduce along fiber axis direction inner cladding cross-sectional area, but because the ratio of doped core and inner cladding cross-sectional area increases gradually, therefore pump power is coupled in doped core equably along fiber lengths, can obtains the even absorption of pump power.
2, this optical fiber is gain fibre, and because fibre core used is doped core, the various gain particles including erbium, ytterbium, thulium and neodymium etc. adulterate on fiber core.So, optical fiber is just " activated ", and becomes active medium, in the time of wavelength pumping with suitable, will on definite wavelength, produce laser and amplification.Therefore, this optical fiber can be applied to optical fiber oscillator and fiber amplifier.
3, the tapered structure of above-mentioned optical fiber, and two sides of tapered side section are symmetrical straight line or camber line.Covering is the speed difference of the optical fiber absorptive pumping power of different pyramidal structures, and therefore, the type of covering pyramidal structure can be by specific design Location of requirement.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these figure other accompanying drawing.
Accompanying drawing 1 is the doubly clad optical fiber structural drawing of the tapered structure of a kind of covering in the present invention;
Fig. 2 is the doubly clad optical fiber design example of the tapered structure of a kind of covering in the present invention;
Fig. 3 is the doubly clad optical fiber design example of the tapered structure of a kind of covering in the present invention;
Fig. 4 is a kind of application example of the optical fiber oscillator that comprises the tapered structured optical fiber of covering.
Fig. 5 is a kind of application example of the fiber amplifier that comprises the tapered structured optical fiber of covering.
Fig. 6: (a) pump light of forward end face-pumping is propagated dynamics in the tapered optical fiber of covering; (b) pump light of forward end face-pumping is propagated dynamics in common double cladded-fiber; (c) pump light of forward end face-pumping is propagated dynamics in common conical fiber; (d) ratio of output pump power and initial incident pump power is along the evolution curve of fiber lengths; (e) infiltration rate of pump power is along the evolution curve of fiber lengths.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, the embodiment of the present invention provides a kind of optical fiber, and described optical fiber comprises doped core 101, inner cladding 102, and surrounding layer 103.The cross-sectional area of doped core 101 is along fiber axis to constant, and the cross-sectional area of inner cladding 102 and surrounding layer 103 is from pumping light incident side to exit end along fiber axis to reducing gradually.Therefore, the area ratio of doped core 101 and inner cladding 102 is along fiber axis to increasing gradually.
Visible, the feature of this optical fiber is: the cross-sectional area of its doped core 101 is constant, and the cross-sectional area of inner cladding is from pumping light incident side to exit end along fiber axis to reducing gradually, and the ratio of doped core and inner cladding cross-sectional area increases gradually.Pump light, from large end face incident, reduces gradually along fiber axis direction inner cladding cross-sectional area, causes the pump light of absorption to reduce, but because the ratio of doped core and inner cladding cross-sectional area increases gradually, therefore can obtain the even absorption of pumping light power.As shown in Figure 6: wherein the wide end diameter of the optical fiber of the tapered structure of covering is 125um, its narrow end diameter is 72um.The propagation dynamic characteristic of pump light in optical fiber, common double cladded-fiber and the common conical fiber of the tapered structure of covering is respectively as shown in (a), (b), (c) in Fig. 6, and what the white luminous point (a), in (b), (c) represented is the pump light that optical fiber absorbs.The ratio of output pump power and initial incident pump power along the evolution of fiber lengths as shown in figure (d), transverse axis in figure (d) represents the length variations of optical fiber, and the longitudinal axis represents to export the ratio of pump power and initial incident pump power; The infiltration rate of pump power is along the evolution of fiber lengths as shown in figure (e), and the transverse axis in figure (e) represents the length variations of optical fiber, and the longitudinal axis represents the infiltration rate of pump power.Can find out, in the common double cladded-fiber and common conical fiber of end pumping, pump absorption mainly concentrates on pumping end surface part, and in the optical fiber of the tapered structure of covering of end pumping, pump power is evenly absorbed along optical fiber.
Optical fiber as above is gain fibre, is that the various gain particles including erbium, ytterbium, thulium and neodymium etc. adulterate on fiber core because fibre core used is doped core.So, optical fiber is just " activated ", and becomes active medium, in the time of wavelength pumping with suitable, will on definite wavelength, produce laser and amplification.Therefore, this optical fiber can be applied to optical fiber oscillator and fiber amplifier.
The tapered structure of above-mentioned optical fiber, and two sides of pyramidal structure side section are symmetrical straight line or camber line.The speed difference of the optical fiber absorptive pumping power of different covering pyramidal structures, therefore, the type of covering pyramidal structure can be by specific design Location of requirement.
Referring to Fig. 2, the embodiment of the present invention provides the design example of the doubly clad optical fiber of the tapered structure of a kind of covering, and wherein the diameter of the fibre core 202 in the optical fiber 201 of the tapered structure of covering is 20um, and along fiber axis to constant.And the diameter of the inner cladding of the optical fiber 201 of the tapered structure of covering is along fiber axis to reducing gradually, wherein, the diameter of the wide end 203 of inner cladding xsect is 125um, the diameter of narrow end 204 is 72um, and the fibre core 202 of the tapered optical fiber 201 of covering and the numerical aperture of inner cladding are that this design example of 0.06/0.22. is convex conical fiber 205.
Referring to Fig. 3, the embodiment of the present invention provides the design example of the doubly clad optical fiber of the tapered structure of another kind of covering, and wherein the diameter of the fibre core 302 in the tapered optical fiber 301 of covering is 20 μ m, and along fiber axis to constant; The diameter of the covering of the tapered optical fiber 301 of covering is along fiber axis to reducing gradually, and wherein, the diameter of the wide end 303 of inner cladding xsect is 400 μ m, and the diameter of narrow end 304 is 100 μ m; The fibre core 302 of the tapered optical fiber 301 of covering and the numerical aperture of inner cladding are 0.06/0.22.This design example is matrix conical fiber 305.
Referring to Fig. 4, the embodiment of the present invention provides a kind of oscillator of the optical fiber that comprises the tapered structure of covering, comprising: optical fiber oscillator is by optical fiber 404, output coupling grating 405 and the output end cap 407 of pumping source 401, bundling device 402, high reflection grating 403, the tapered structure of covering.
These devices form an all optical fiber system by multiple fusion points 406.Adopt forward end face-pumping coupling, through bundling device 402, pumping source 401 laser coupled are entered to the tapered gain fibre 404 of covering.A specific spontaneous emission light is selected in the vibration chamber being made up of high reflection grating 403 and output coupling grating 405, and its vibration in vibration chamber is amplified, and laser is exported from end cap 407.
Referring to Fig. 5, another embodiment of the present invention provides a kind of amplifier of the optical fiber that comprises the tapered structure of covering, comprising: seed source 501, pumping source 502, bundling device 503, the tapered gain fibre 504 of covering and output end cap 506.
These devices form an all optical fiber system by fusion point 505.Adopt forward end face-pumping coupling, seed source 501 laser and pumping source 502 laser coupled are entered to the tapered gain fibre 504 of covering.Pump light and flashlight inject from the wide end of the tapered gain fibre 504 of covering, penetrate from narrow the bringing out of the tapered gain fibre 504 of covering.Finally, the flashlight after amplification is from the output of end cap 506.
Above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. an optical fiber, is characterized in that, comprising: fibre core, inner cladding and surrounding layer;
The xsect of fibre core is along fiber axis to remaining unchanged;
The cross-sectional area of inner cladding from one end of pump light incident to one end of pump light outgoing along fiber axis to gradually changing, thereby inner cladding is along fiber axis to the large and little cone of one end cross-sectional area of pump light outgoing of one end cross-sectional area that becomes pump light incident.
2. optical fiber according to claim 1, is characterized in that, described optical fiber is gain fibre.
3. optical fiber according to claim 2, is characterized in that,
Described fibre core belongs to doped core, on fiber core doped with erbium, ytterbium, thulium and neodymium wherein one or more.
4. optical fiber according to claim 1, is characterized in that, the type of the index distribution of fibre core is wherein a kind of in step shape, shoulder shape, A shape, parabolical, W shape.
5. optical fiber according to claim 1, is characterized in that,
Described cone is symmetrical straight line or camber line along two sides of optical fiber axial section, and described cone is along fiber axis Rotational Symmetry.
6. an optical fiber oscillator, is characterized in that, comprises the optical fiber described in any one in claim 1 to 5.
7. a fiber amplifier, is characterized in that, comprises the optical fiber described in any one in claim 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310616937.7A CN103777271A (en) | 2013-11-27 | 2013-11-27 | Fiber, fiber oscillator and fiber amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310616937.7A CN103777271A (en) | 2013-11-27 | 2013-11-27 | Fiber, fiber oscillator and fiber amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103777271A true CN103777271A (en) | 2014-05-07 |
Family
ID=50569726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310616937.7A Pending CN103777271A (en) | 2013-11-27 | 2013-11-27 | Fiber, fiber oscillator and fiber amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103777271A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015172335A1 (en) * | 2014-05-14 | 2015-11-19 | 深圳市大族激光科技股份有限公司 | Homogeneous pump structure of laser, and design method for structure |
| CN105319642A (en) * | 2014-07-29 | 2016-02-10 | Ofs菲特尔有限责任公司 | Polarization-maintaining (PM) double-clad (DC) optical fiber |
| CN106911059A (en) * | 2017-02-24 | 2017-06-30 | 中国人民解放军国防科学技术大学 | All optical fibre structure 980nm wave band high-power fiber oscillators |
| CN106959489A (en) * | 2017-05-25 | 2017-07-18 | 中国人民解放军国防科学技术大学 | A kind of high-power fiber end cap based on conical fiber |
| CN107561635A (en) * | 2017-10-13 | 2018-01-09 | 中国工程物理研究院激光聚变研究中心 | Gradual change absorption coefficient gain fibre and optical system |
| CN109994920A (en) * | 2019-05-09 | 2019-07-09 | 中国人民解放军国防科技大学 | Laser oscillator based on spindle-shaped gain fiber with continuously graded core cladding size |
| CN110011171A (en) * | 2019-05-09 | 2019-07-12 | 中国人民解放军国防科技大学 | Laser oscillator based on core cladding size subsection gradient spindle-shaped gain fiber |
| CN111431022A (en) * | 2020-03-04 | 2020-07-17 | 深圳市欧凌镭射科技有限公司 | Optical fiber amplifier and laser generator |
| CN111740313A (en) * | 2020-07-09 | 2020-10-02 | 江苏师范大学 | Mid-infrared all-fiber laser oscillator based on tapered double-clad Raman gain fiber and method for generating mid-infrared laser |
| CN112859353A (en) * | 2019-11-12 | 2021-05-28 | 深圳市绎立锐光科技开发有限公司 | Light source device |
| CN113311540A (en) * | 2020-02-26 | 2021-08-27 | 朗美通经营有限责任公司 | Optical fiber inner retroreflector |
| CN114859460A (en) * | 2022-07-06 | 2022-08-05 | 武汉长进激光技术有限公司 | Multi-core gain optical fiber, optical fiber amplifier and optical fiber oscillator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6608951B1 (en) * | 2000-11-28 | 2003-08-19 | Lew Goldberg | Optical fiber amplifiers and lasers and optical pumping device therefor |
-
2013
- 2013-11-27 CN CN201310616937.7A patent/CN103777271A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6608951B1 (en) * | 2000-11-28 | 2003-08-19 | Lew Goldberg | Optical fiber amplifiers and lasers and optical pumping device therefor |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106030933A (en) * | 2014-05-14 | 2016-10-12 | 大族激光科技产业集团股份有限公司 | Homogeneous pump structure of laser, and design method for structure |
| GB2541303A (en) * | 2014-05-14 | 2017-02-15 | Han's Laser Tech Ind Group Co Ltd | Homogeneous pump structure of laser, and design method for structure |
| US20170047703A1 (en) * | 2014-05-14 | 2017-02-16 | Han's Laser Technology Industry Group Co., Ltd. | Homogeneous pump structure of laser, and design method for structure |
| WO2015172335A1 (en) * | 2014-05-14 | 2015-11-19 | 深圳市大族激光科技股份有限公司 | Homogeneous pump structure of laser, and design method for structure |
| CN105319642B (en) * | 2014-07-29 | 2019-11-01 | Ofs菲特尔有限责任公司 | Polarization-maintaining (PM) double clad (DC) optical fiber |
| CN105319642A (en) * | 2014-07-29 | 2016-02-10 | Ofs菲特尔有限责任公司 | Polarization-maintaining (PM) double-clad (DC) optical fiber |
| CN106911059A (en) * | 2017-02-24 | 2017-06-30 | 中国人民解放军国防科学技术大学 | All optical fibre structure 980nm wave band high-power fiber oscillators |
| CN106959489A (en) * | 2017-05-25 | 2017-07-18 | 中国人民解放军国防科学技术大学 | A kind of high-power fiber end cap based on conical fiber |
| CN106959489B (en) * | 2017-05-25 | 2022-10-18 | 中国人民解放军国防科学技术大学 | High-power optical fiber end cap based on tapered optical fiber |
| CN107561635A (en) * | 2017-10-13 | 2018-01-09 | 中国工程物理研究院激光聚变研究中心 | Gradual change absorption coefficient gain fibre and optical system |
| CN109994920A (en) * | 2019-05-09 | 2019-07-09 | 中国人民解放军国防科技大学 | Laser oscillator based on spindle-shaped gain fiber with continuously graded core cladding size |
| CN110011171A (en) * | 2019-05-09 | 2019-07-12 | 中国人民解放军国防科技大学 | Laser oscillator based on core cladding size subsection gradient spindle-shaped gain fiber |
| CN112859353A (en) * | 2019-11-12 | 2021-05-28 | 深圳市绎立锐光科技开发有限公司 | Light source device |
| CN113311540A (en) * | 2020-02-26 | 2021-08-27 | 朗美通经营有限责任公司 | Optical fiber inner retroreflector |
| CN111431022A (en) * | 2020-03-04 | 2020-07-17 | 深圳市欧凌镭射科技有限公司 | Optical fiber amplifier and laser generator |
| CN111740313A (en) * | 2020-07-09 | 2020-10-02 | 江苏师范大学 | Mid-infrared all-fiber laser oscillator based on tapered double-clad Raman gain fiber and method for generating mid-infrared laser |
| CN114859460A (en) * | 2022-07-06 | 2022-08-05 | 武汉长进激光技术有限公司 | Multi-core gain optical fiber, optical fiber amplifier and optical fiber oscillator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103777271A (en) | Fiber, fiber oscillator and fiber amplifier | |
| US8639080B2 (en) | Optical fiber with multi section core | |
| CN105431754B (en) | Rotating non-circular and non-oval doped core optical fiber and use its equipment | |
| WO2020259643A1 (en) | Triple-clad fiber, pump combiner, fiber grating, and fiber laser | |
| US10644475B2 (en) | Random distributed Rayleigh feedback fiber laser based on double-cladding weakly ytterbium-doped fiber | |
| CN204790085U (en) | Fiber combiner | |
| CN103746283A (en) | Method for improving pumping efficiency of fiber laser and fiber laser thereof | |
| US9515450B2 (en) | Amplifying optical fiber and optical amplifier | |
| CN103199420A (en) | Single-fiber simple-oscillator kilowatt-grade all-fiber laser | |
| WO2020259644A1 (en) | Large-mode-area triple-clad passive fiber, mode stripper and fiber laser | |
| CN205982710U (en) | Double -contracting layer active optical fibre | |
| CN102255235A (en) | Method for filtering cladding light in doubly clad optical fibers | |
| CN103022866A (en) | Modulated oscillator power amplifier (MOPA) type random fiber optic laser device | |
| CN103915750A (en) | Optical-fiber laser device | |
| CN104280822A (en) | High-power weak-tapering low-loss pumping/signal combiner | |
| CN104092087A (en) | High-energy short-pulse fiber laser amplifier | |
| CN201955492U (en) | Doubly clad optical fiber laser coupling device | |
| CN101398511A (en) | Double clad optical fiber for laser unit | |
| CN107181160A (en) | A kind of high-energy nanosecond pulse full-optical-fiber laser based on repeatedly incoherent conjunction beam | |
| US9225142B2 (en) | Fiber amplifier with multi section core | |
| JP2008198637A (en) | Termination structure of optical fiber for propagating high-intensity light, optical amplifier and fiber laser | |
| CN103545704A (en) | Implantable side-pumping coupling method | |
| CN207052929U (en) | A kind of high-energy nanosecond pulse full-optical-fiber laser based on repeatedly incoherent conjunction beam | |
| CN104577652B (en) | The production method of array fibre laser, amplifier and multi-core type optical fiber | |
| CN112117628A (en) | Optical fiber laser amplifier with high stimulated Brillouin scattering threshold value and high conversion efficiency |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140507 |
|
| RJ01 | Rejection of invention patent application after publication |