CN108155546A - It is a kind of to match optical fiber for generating the doubly clad optical fiber of big circular hollow light beam - Google Patents
It is a kind of to match optical fiber for generating the doubly clad optical fiber of big circular hollow light beam Download PDFInfo
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- CN108155546A CN108155546A CN201711476252.1A CN201711476252A CN108155546A CN 108155546 A CN108155546 A CN 108155546A CN 201711476252 A CN201711476252 A CN 201711476252A CN 108155546 A CN108155546 A CN 108155546A
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- optical fiber
- doubly clad
- inner cladding
- clad optical
- light beam
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- 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
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
- G02B6/03633—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - -
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Lasers (AREA)
Abstract
The present invention provides a kind of doubly clad optical fibers to match optical fiber, including surrounding layer 101, inner cladding 102, fibre core 103, doubly clad optical fiber matching optical fiber is used to generate big circular hollow light beam, the surrounding layer 101 is made with the fibre core 103 of pure quartz material, and the inner cladding 102 is made of the quartz material of doping Germanium.Doubly clad optical fiber matching optical fiber can be matched with annular doping double-cladding gain fibre, so as to effectively improve pump light absorption efficiency, have potential application prospect in 2 mu m waveband high power fiber laser fields.
Description
Technical field
The present invention relates to technical field of optical fiber more particularly to a kind of doubly clad optical fiber matching optical fiber, available for generating big ring
Shape hollow beam.
Technical field
The present invention relates to optical fiber laser field more particularly to a kind of 2 μ based on high birefringence phase shift chirped fiber grating
M wave band multi-wavelength switching fiber lasers.
Background technology
Nowadays, 2 mu m waveband high power fiber lasers show in fields such as industrial processes, military affairs, space flight and aviation, medical treatment
Increasing advantage is gone out, has had many advantages, such as that good beam quality, optical power density are high, small, light light conversion efficiency is high.
With the continuous development of technology, the requirement for gain fibre is mainly manifested in：1) high-selenium corn efficiency；2) high beam
Quality；3) low-loss；4) high non-linearity threshold value.Double- cladding doped fiber belongs to the main gain of high power fiber laser at present
Fiber type, it increases an inner cladding than conventional fiber, is made of surrounding layer, inner cladding and doped core, surrounding layer
Refractive index less than inner cladding, make waveguide of the inner cladding as pump light, lateral dimension and numerical aperture are much larger than fibre core
Lateral dimension and numerical aperture, can gain pump light significantly launched power, improve laser output power.Then, in order into
One step increases the absorption of pump light, and so as to further improve output laser power, researchers have also been proposed annular doping double-contracting
Traditional fibre core doping is changed into and carries out circular ring shape doping around non-impurity-doped fibre core, can not only increased in this way by layer optical fiber
The doping concentration of rare earth ion can also greatly improve the absorption efficiency of pump light.However, still there is part in this configuration
Pump light core region propagate, not only waste pump light, but also can have an adverse effect to flashlight, there is very it is big not
Foot.
Invention content
In order to overcome above-mentioned deficiency, the present invention provides a kind of for generating the doubly clad optical fiber of big circular hollow light beam
With optical fiber, for matching 2 mu m waveband doubly clad optical fibers of annular doping, the pump of 2 mu m waveband optical fiber lasers can be effectively improved
Pu efficiency.
To achieve these goals, this invention takes following technical solutions：
A kind of doubly clad optical fiber matches optical fiber, including surrounding layer 101, inner cladding 102, fibre core 103；It is characterized in that：It should
Doubly clad optical fiber matching optical fiber is for generating big circular hollow light beam, and the surrounding layer 101 is with the fibre core 103 by pure quartzy material
Material is made, and the inner cladding 102 is made of the quartz material of doping Germanium.
A kind of doubly clad optical fiber matching optical fiber, structural parameters are：101 radius of surrounding layer is 62.5 μm, institute
It is 6 μm to state 103 radius of fibre core, and 102 thickness of inner cladding is 6.5 μm, and 102 refractive index of inner cladding is 1.4624.
Preferably, doubly clad optical fiber matching optical fiber is used for the annular doping double-contracting of 2 mu m waveband high power fiber lasers
Layer optical fiber.
Preferably, doubly clad optical fiber matching optical-fibre needle designs 793nm laser pump (ing)s.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
It obtains significantly or is recognized by the practice of the present invention.
Description of the drawings
A kind of Fig. 1 sections for the doubly clad optical fiber matching optical fiber for being used to generate big circular hollow light beam of the present invention
Figure.
A kind of doubly clad optical fiber matching light for being used to generate big circular hollow light beam described in Fig. 2 embodiment of the present invention 1
Mode distributions figure of the fibre at 793nm；
A kind of doubly clad optical fiber matching light for being used to generate big circular hollow light beam described in Fig. 3 embodiment of the present invention 1
Normalized energy distribution map of the fibre at 793nm；
Annular beam width described in Fig. 4 embodiment of the present invention 2 is with core size variation relation figure；
Limitation described in Fig. 5 embodiment of the present invention 2 is lost with core size variation relation figure；
Annular beam width described in Fig. 6 embodiment of the present invention 3 is with inner cladding dimensions variation relation figure；
Limitation described in Fig. 7 embodiment of the present invention 3 is lost with inner cladding dimensions variation relation figure；
Blackening size described in Fig. 8 embodiment of the present invention 4 is with inner cladding refractive index variation relation figure；
Annular beam width described in Fig. 9 embodiment of the present invention 4 is with inner cladding refractive index variation relation figure；
In figure, 101, surrounding layer, 102, inner cladding, 103, fibre core.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless otherwise defined all terms used herein are (including technology art
Language and scientific terminology) there is the meaning identical with the general understanding of the those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, will not be with idealizing or the meaning of too formal be explained.
As shown in Figure 1, a kind of doubly clad optical fiber matching optical fiber for being used to generate big circular hollow light beam that the present invention designs,
Its structure includes surrounding layer 101, inner cladding 102, fibre core 103；The surrounding layer 101 is with the fibre core 103 by pure quartz material
It is made, the inner cladding 102 is made of the quartz material of doping Germanium or other elements.
Doubly clad optical fiber of the present invention matches optical fiber, and structural parameters are：101 radius of surrounding layer is 62.5 μ
M, 103 radius of fibre core are 6 μm, and 102 thickness of inner cladding is 6.5 μm, and 102 refractive index of inner cladding is 1.4624.
It is the matching optical fiber for being directed to the annular doping double-cladding optical fiber for 2 mu m waveband high power fiber lasers that it, which is designed, for
Pump wavelength is 793nm.
Based on same design philosophy, or can be used for described in other kinds of annular doping double-cladding optical fiber design
Generate the doubly clad optical fiber matching optical fiber of big circular hollow light beam.
Illustrate a kind of pair for being used to generate big circular hollow light beam of the present invention below by way of several examples of implementation
Cladded-fiber matches the design and parameter selection process of optical fiber.
Embodiment 1
Structure according to Fig. 1 sets the original dimension of the fibre core 103 as 1 μm, and 102 radius of inner cladding is 2
μm, i.e., the thickness of described inner cladding 102 is 1 μm, and the refractive index of the inner cladding 102 is 1.4544, the half of the surrounding layer 101
Diameter is 62.5 μm；As shown in Fig. 2, it is that mode distributions figure of the optical fiber at 793nm is matched under more than parameter；As shown in figure 3, for
Normalized energy distribution map of the optical fiber at 793nm is matched under upper parameter, wherein WFWHM is the width of light beam (meter of hollow beam
What is calculated is halfwidth, i.e., spectral width when energy intensity reaches highest energy intensity half on the outside of light beam), blackening size
(DSS) refer to spectral width when light beam inside energy intensity reaches highest energy intensity half, r0 is represented from largest beam energy
Measure the distance of spot center；By Fig. 2 and Fig. 3 as it can be seen that a kind of pair for being used to generate big circular hollow light beam of the present invention
Cladded-fiber matches optical fiber after the input of 793nm laser, can concentrate in inner cladding region most luminous power, illustrate this
Matching optical fiber can generate the hollow beam of high quality.
Embodiment 2
Based on 1 parameter of embodiment, change 103 radius of fibre core (respectively for 3 μm, 4 μm, 5 μm, 6 μm), and keep
102 constant thickness of inner cladding, i.e., described 103 radius of fibre core and 102 radius of the inner cladding increase simultaneously, annular beam
Width and limitation loss are with the variation of 103 size of fibre core respectively as shown in Fig. 4 and Fig. 5 homologous threads.It can from figure
Go out, compared with 1 optical fiber of example, the blackening size of bigger and lower limitation loss are obtained under the parameter.When the fibre core 103
Radius increase to 6 μm after, limit the magnitude of loss already close to 10-12, the limitation loss than optical fiber in example 1 is small close
Two magnitudes, therefore it is 6 μm to select 103 radius of fibre core.
Embodiment 3
Based on 1 parameter of embodiment, 102 thickness of inner cladding is stepped up by 1 μm to 7 μm, annular beam width and
Limitation loss is with the variation of 102 thickness of inner cladding respectively as shown in Fig. 6 and Fig. 7 homologous threads.It can be seen from the figure that ring-shaped light
Beam width approximate linear growth as 102 thickness of inner cladding increases, when 102 thickness of inner cladding increases to 6.5 μm
When, limitation loss drops to 10-12.Therefore, it is 6.5 μm to select 102 thickness of inner cladding, at this time 103 radius of fibre core
It it is all 6 μm, it is 11 μm that can obtain blackening size, and width of light beam is 3 μm.By Fig. 6, Fig. 7 simultaneously it is found that because annular beam width with
102 thickness of inner cladding increases approximate linear growth, and limits loss and reached 10-12, close to the limit, therefore according to need
The difference for the doped gain fiber to be connected, the thickness of the inner cladding 102 can also be more than 6.5 μm.
Embodiment 4
Based on 1 parameter of embodiment, change the refractive index of the inner cladding 102, blackening size and annular beam width can be obtained
With the inner cladding 102 refractive index variation respectively as shown in Fig. 8 and Fig. 9 homologous threads.As it can be seen that with the inner cladding
The continuous increase of 102 refractive index, annular beam width is constantly declining, and blackening size is being continuously increased.Consider,
Inner cladding refractive index is selected as 1.4624.
The present invention's is described a kind of for generating the doubly clad optical fiber of big circular hollow light beam matching optical fiber, for for
Designed by the annular doping double-cladding gain fibre of 2 mu m waveband high power fiber lasers, 793nm pump lights are inputted this first
The invention matching optical fiber can generate hollow beam, can be matched with annular doping double-cladding gain fibre, so as to effectively carry
High pumping efficiency of light absorption has potential application prospect in 2 mu m waveband high power fiber laser fields.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (3)
1. a kind of doubly clad optical fiber matches optical fiber, including surrounding layer 101, inner cladding 102, fibre core 103；It is characterized in that：This pair
Cladded-fiber matching optical fiber is for generating big circular hollow light beam, and the surrounding layer 101 is with the fibre core 103 by pure quartz material
It is made, the inner cladding 102 is made of the quartz material of doping Germanium.
2. doubly clad optical fiber according to claim 1 matches optical fiber, it is characterised in that：Doubly clad optical fiber matching optical fiber is used
In the annular doping double-cladding optical fiber of 2 mu m waveband high power fiber lasers.
3. doubly clad optical fiber according to claim 1 or 2 matches optical fiber, it is characterised in that：The doubly clad optical fiber matches light
Fibre is designed for 793nm laser pump (ing)s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711476252.1A CN108155546A (en) | 2017-12-29 | 2017-12-29 | It is a kind of to match optical fiber for generating the doubly clad optical fiber of big circular hollow light beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711476252.1A CN108155546A (en) | 2017-12-29 | 2017-12-29 | It is a kind of to match optical fiber for generating the doubly clad optical fiber of big circular hollow light beam |
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| CN108155546A true CN108155546A (en) | 2018-06-12 |
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| CN201711476252.1A Pending CN108155546A (en) | 2017-12-29 | 2017-12-29 | It is a kind of to match optical fiber for generating the doubly clad optical fiber of big circular hollow light beam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270625A (en) * | 2018-10-25 | 2019-01-25 | 北京航空航天大学 | A kind of cucurbit optical fiber transmitting hollow beam |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101320109A (en) * | 2008-06-13 | 2008-12-10 | 华中科技大学 | Rare earth ion annular doping double-cladding optical fiber |
| CN102621628A (en) * | 2012-03-22 | 2012-08-01 | 华中科技大学 | Optical fiber with ring-shaped doped layer and preparation method thereof and laser containing optical fiber |
| US20160170138A1 (en) * | 2013-07-25 | 2016-06-16 | B.G. Negev Technologies And Applications Ltd. | Single large mode cladding amplification in active double-clad fibers |
-
2017
- 2017-12-29 CN CN201711476252.1A patent/CN108155546A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101320109A (en) * | 2008-06-13 | 2008-12-10 | 华中科技大学 | Rare earth ion annular doping double-cladding optical fiber |
| CN102621628A (en) * | 2012-03-22 | 2012-08-01 | 华中科技大学 | Optical fiber with ring-shaped doped layer and preparation method thereof and laser containing optical fiber |
| US20160170138A1 (en) * | 2013-07-25 | 2016-06-16 | B.G. Negev Technologies And Applications Ltd. | Single large mode cladding amplification in active double-clad fibers |
Non-Patent Citations (1)
| Title |
|---|
| 孟令轩等: "产生波长793nm中空光束的双包层光纤的优化设计", 《光电技术应用》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270625A (en) * | 2018-10-25 | 2019-01-25 | 北京航空航天大学 | A kind of cucurbit optical fiber transmitting hollow beam |
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Application publication date: 20180612 |
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