CN105403951B - The method of the multicore photonic crystal optical fiber and its laser amplifier of hollow-solid composite - Google Patents
The method of the multicore photonic crystal optical fiber and its laser amplifier of hollow-solid composite Download PDFInfo
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- CN105403951B CN105403951B CN201510967177.3A CN201510967177A CN105403951B CN 105403951 B CN105403951 B CN 105403951B CN 201510967177 A CN201510967177 A CN 201510967177A CN 105403951 B CN105403951 B CN 105403951B
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- photonic crystal
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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
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02338—Structured core, e.g. core contains more than one material, non-constant refractive index distribution in core, asymmetric or non-circular elements in core unit, multiple cores, insertions between core and clad
-
- 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
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02323—Core having lower refractive index than cladding, e.g. photonic band gap guiding
- G02B6/02328—Hollow or gas filled core
-
- 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
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
- G02B6/02347—Longitudinal structures arranged to form a regular periodic lattice, e.g. triangular, square, honeycomb unit cell repeated throughout cladding
-
- 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
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
- G02B6/02357—Property of longitudinal structures or background material varies radially and/or azimuthally in the cladding, e.g. size, spacing, periodicity, shape, refractive index, graded index, quasiperiodic, quasicrystals
-
- 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
- H01S3/06754—Fibre amplifiers
Abstract
The invention discloses a kind of methods of the multicore photonic crystal optical fiber and its laser amplifier of hollow-solid composite, ecto-entad successively includes: protective layer, covering and fibre core, the fibre core includes solid gain core and hollow core, the covering is formed with the hollow core and the identical structure of Hollow-Core Photonic Crystal Fibers, the present invention carries out Hollow-Core Photonic Crystal Fibers with multicore photonic crystal optical fiber compound, the non-linear conjunction beam of the high damage threshold of Hollow-Core Photonic Crystal Fibers and multicore photonic crystal optical fiber is combined, the two complements each other, the advantages of the two has been fully retained, it overcomes simultaneously respective using limitation, limit laser energy by multicore photon lens lesion threshold value, by single-mode laser pulse peak power amplification output to GW grades or mean power amplification output to 100kW grades.
Description
Technical field
The present invention relates to high-capacity optical fiber laser technical fields, in particular to a kind of the more of hollow-solid composite
The method of core photonic crystal fiber and its laser amplifier.
Background technique
E.Snitzer in 1961 et al. proposes the concept of optical fiber laser, the artificial extremely low loss light such as high Kun in 1966
Fine development specifies direction.From this, optical-fiber laser is only with its high reliability, high intense, high energy efficiency and maintenance-free feature etc.
Special advantage has been widely used in each field.E.Snitzer in 1988 et al. has also been proposed the concept of doubly clad optical fiber, makes
The pump power that optical fiber can couple absorption is obviously improved, and provides possibility for high power laser light amplification.Generation nineteen ninety end is single
The appearance of mould or few mould large mode field optical fiber, improves the non-linear threshold and damage threshold of optical fiber, makes high power optical fibre laser
It is rapidly developed.High power shows two aspects: high-average power and high-peak power.In terms of high-average power, with
IPG company is representative, realizes within 2005 the output of kW grades of optical-fiber lasers, power was further promoted to 9.6kW in 2009.?
In terms of high-peak power, Teodoro of US Naval Research Laboratory in 2002 et al. utilizes 25 μm of core diameter, NA=0.1, coiling
The seed laser energy of pulsewidth 780ps, repetition 8.5kHz are amplified to 255 μ J, peak power by the Yb dosed optical fiber of diameter 1.67cm
Reach 330kW, beam quality factor M2=1.08.2005, M.Y.Cheng of Michigan university of the U.S. et al. utilized fibre core
80 μm of diameter, NA=0.06, coil radius 4.25cm Yb dosed optical fiber obtain 5MW peak power laser output, light beam matter
Measure factor M2=1.3.Teodoro in 2006 et al. uses 100 μm of core diameter diameter of rodlike photonic crystal fiber, by 1ns or so
Pulsed laser energy be amplified to 4.3mJ, peak power 4.5MW, beam quality factor M2=1.3.
The invention and large mode field optical fiber of doubly clad optical fiber, the especially development of large mode area pcf are benefited from, it is high
The peak power of energy impulse optical-fiber laser has obtained fast lifting in the several years ago interior of 21 century, realizes pulse energy number milli
Burnt, peak power number megawatt nearly single-mode output.However, the peak work of the nearly single-mode output of high energy pulse optical-fiber laser in the past 10 years
Rate is not significantly increased.Its reason is that the physics limit of the high energy pulse optical-fiber laser of nearly single-mode output has shown, and works as fibre
When core model field diameter is greater than 20um, the load capacity of optical fiber is primarily limited to self-focusing effect.Self-focusing effect is from quartz
The Kerr effect of glass core.It is 4.25MW for linearly polarized photon self focusing threshold, is for circularly polarized light self focusing threshold
5.84MW.When laser pulse peaks power is more than self focusing threshold, optical fiber will will receive destruction.Self-focusing is a kind of and peak value
The relevant nonlinear effect of power, further expansion fibre-optic mode field diameter can only reduce Self-phase modulation (SPM), poor phase tune
The peak power densities phases such as system (XPM), four-wave mixing (FWM), stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS)
The nonlinear effect of pass can not eliminate self-focusing effect.
Therefore, the high energy pulse optical-fiber laser based on conventional solid core optical fiber is difficult to further promote the peak work of single-mode output
Rate and pulse energy.
R.F.Cregan in 1999 et al. has prepared Hollow-Core Photonic Crystal Fibers.According to waveguide Forming Mechanism, hollow light
Photonic crystal fiber can be divided into three kinds of photon band-gap optical fiber, kagom é structured optical fiber and antiresonance optical fiber etc..Kagom é structured optical fiber
Quartz glass in laser power accounting it is minimum, laser power is concentrated mainly on hollow area in hollow-core fiber, and therefore, optical fiber can
Bear very high peak power and pulse energy.Up to GW grades of peak power and 1014W/cm2The peak power density of grade is resistance to
It has been verified in an experiment by threshold value, and has been expected to bear higher peak power.Hollow-core fiber tolerance threshold is far high
The self focusing threshold of number MW in solid core optical fiber, therefore the pulse energy that can bear much higher than solid core optical fiber can be transmitted.
In recent years, Hollow-Core Photonic Crystal Fibers are with its unique advantage, in high energy pulse energy transmission, higher hamonic wave generation, plasma
Body generates, supercontinuum generation and pulse have attracted a large amount of concerns in the fields such as compression certainly.
The high threshold characteristic of Hollow-Core Photonic Crystal Fibers has benefited from power accounting minimum in quartz glass, however this is simultaneously
Also resulting in laser mould field and doped dielectric can not effectively overlap, so that signal laser is difficult to gain amplification.Therefore, hollow photon is brilliant
Body optical fiber can only be used as transmission medium at present, cannot amplify to pulsed laser energy, transmitted high-peak power laser needs by
Other type lasers generate.
Summary of the invention
For above-mentioned problems of the prior art, the multicore photon that the present invention provides a kind of hollow-solid composite is brilliant
The method of body optical fiber and its laser amplifier, the present invention is compound by Hollow-Core Photonic Crystal Fibers and multicore photonic crystal optical fiber progress,
The non-linear conjunction beam of the high damage threshold of Hollow-Core Photonic Crystal Fibers and multicore photonic crystal optical fiber is combined, laser is enable
Amount is not limited by multicore photon lens lesion threshold value, and the amplification output of single-mode laser pulse peak power is to GW grades or average
Power amplification is exported to 100kW grades.
To achieve the above object, the invention provides the following technical scheme:
A kind of multicore photonic crystal optical fiber of hollow-solid composite, ecto-entad successively include: protective layer, covering and fibre
Core, the fibre core include solid gain core and hollow core, and the covering and the hollow core are formed and hollow photon is brilliant
The identical structure of body optical fiber.
Further, the Hollow-Core Photonic Crystal Fibers are kagom é structured optical fiber.
It further, is vacuum in the hollow core.
Further, the solid gain core is evenly distributed around hollow core.
Further, covering structure identical with the solid gain core formation and big core diameter photonic crystal fiber.
In addition, the present invention also provides a kind of multicore photonic crystal optical fibers using above-mentioned hollow-solid composite to carry out laser
Pumping laser and signal laser are coupled into the multicore photonic crystal optical fiber of hollow-solid composite, pass through by the method for amplification
It adjusts, after signal laser is amplified in solid gain core, the signal laser in multiple solid gain cores occurs non-linear
Beam is closed, the signal laser in solid gain core is coupled into hollow core.
Further, the signal laser in multiple solid gain cores is coupled into hollow core while gain is amplified.
Further, the length of the multicore photonic crystal optical fiber of hollow-solid composite is first coupling week of signal laser
The length of phase.
Further, the adjusting includes fine to the spacing of solid gain core, the bore of solid gain core, solid gain
The air pore structure of core or the adjusting of signal laser.
Beneficial effects of the present invention are as follows:
1, the present invention carries out Hollow-Core Photonic Crystal Fibers and multicore photonic crystal optical fiber compound, by hollow photon crystal light
The non-linear conjunction beam of fine high damage threshold and multicore photonic crystal optical fiber is combined, and the two complements each other, and is fully retained
The advantages of the two, while overcoming respective use and limiting, limit laser energy by multicore photon lens lesion threshold value,
By single-mode laser pulse peak power amplification output to GW grades or mean power amplification output to 100kW grades；
2, Hollow-Core Photonic Crystal Fibers use kagom é structured optical fiber, and carry out vacuumize process to hollow parts, can
Further increase the tolerance power of hollow core；
3, the present invention can guarantee that signal laser obtains enough energy amplifications using big core diameter multicore photonic crystal optical fiber,
Its single mode transport performance ensures that the beam quality after signal laser is amplified is more excellent simultaneously.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
In figure: 1-protective layer, 2-coverings, 21-covering edges, 3-solid gain cores, 31-micro- stomatas, 41-is empty
Heart fibre core, 42-micro- stomatas.
Specific embodiment
It is right below with reference to attached drawing of the invention in order to make those skilled in the art more fully understand technical solution of the present invention
Technical solution of the present invention carries out clear, complete description, and based on the embodiment in the application, those of ordinary skill in the art exist
Other similar embodiments obtained under the premise of creative work are not made, shall fall within the protection scope of the present application.
Embodiment one:
As shown in Figure 1, a kind of multicore photonic crystal optical fiber of hollow-solid composite, ecto-entad successively includes: protective layer
1, covering 2, solid gain core 3 and hollow core 41, covering 2 form micro- stomata 42 around hollow core 41, the part band
The covering 2 of micro- stomata 42 forms structure identical with Hollow-Core Photonic Crystal Fibers with hollow core 41, and hollow core 41 is for passing
Defeated high energy signal laser, micro- stomata 42 are in the present embodiment preferably, hollow for signal laser to be limited in hollow core 41
Photonic crystal fiber is kagom é structured optical fiber, is vacuum state in the hollow core 41, can further increase hollow fibre
The tolerance power and damage threshold of core 41.Regularly arranged micro- stomata 31 is equipped in covering 2 around solid gain core 3, it should
Covering 2 of the part with micro- stomata 31 and solid gain core 3 form structure identical with big core diameter photonic crystal fiber, big core diameter
Referring to that diameter is greater than 20 μm, in the present embodiment preferably, the solid gain core 3 is evenly distributed around hollow core 41, this
Preferred solid gain core 3 is 10 in embodiment, and solid gain core 3 has doping particle, for the amplification of signal laser,
Covering uses quartz glass, is protective layer on the outside of covering edge 21, protective layer is quartz material.In addition to this, hollow core 41
It can also be arranged as a circle with solid gain core 3, or be arranged as other shapes, hollow core 41 is not necessarily disposed at center
Position.
In addition, the present invention also provides a kind of multicore photonic crystal optical fibers using above-mentioned hollow-solid composite to carry out laser
The method of amplification: pumping laser and signal laser are entered to the multicore photonic crystal light of hollow-solid composite by end coupling
Fibre, by the design of 31 structure of bore and micro- stomata of the fibre core spacing, solid gain core 3 to solid gain core 3 and
The adjusting of Injection Signal laser is amplified signal laser constantly in solid gain core 3, real after being amplified to a certain degree
Non-linear conjunction beam occurs for the signal laser in heart gain core 3, and the signal laser in solid gain core 3 is amplified in transmission
Hollow core 41 is constantly coupled into journey, the signal laser coupling by the adjusting of fiber lengths, in 10 solid gain cores 3
It closes and enters the coupling for the first time after hollow core 41 is amplified for signal laser, to guarantee to close beam efficiency as maximum.Solid gain
Signal laser in fibre core 3 constantly obtains gain amplification under pumping laser effect, while transmitting in amplification process and leading at it again
It crosses non-linear conjunction Shu Zuoyong laser energy is coupled into hollow core 41.By adjusting to signal laser gain size and
To coupling, signal laser peak power can be maintained at the tolerance threshold of solid gain core 3 hereinafter, passing through by strong and weak design
Pump laser power is constantly converted to signal laser power in hollow core 41 by solid gain core 3.In hollow core 41
Signal laser constantly couple during propagation by non-linear conjunction Shu Zuoyong absorb it is sharp in multiple solid gain cores 3
Optical pulse energy realizes the quick amplification of pulse energy.
From the point of view of whole optical fiber, pump power is constantly changed into the signal in hollow core 41 and swashs during laser transmission
Light pulse power generates the effect of pulse amplifying.Hollow core 41 has very high tolerance threshold, is able to bear GW grades of arteries and veins
Rush peak power and 1014W/cm2The peak power density of grade, for ns pulse signal laser, GW grades of peak power means J
The pulse energy of grade.On the other hand, the signal laser in hollow core 41 absorbs constantly put in multiple solid gain cores 3 simultaneously
Big signal laser energy is equivalent to multiple solid gain cores 3 and simultaneously amplifies to the signal laser in hollow core 41, makes sky
Signal laser amplification speed with higher in heart fibre core 41, can achieve higher amplification factor.Conventional fiber laser
Gain amplification be the process that the pumping laser of low-light level is converted to the signal laser of high brightness, and based on hollow-real
The gain amplification of the compound multicore photonic crystal optical fiber of the heart, which not only has, is converted to the solid of high-energy for the pumping laser of low-light level
The process of 3 signal laser of gain core, while there are also 3 signal laser of solid gain core of low energy is converted to high-energy
The process of 41 signal laser of hollow core.Through the invention, it is the bottleneck for breaking through the development of high energy pulse optical-fiber laser, makes optical fiber
Peak power GW grades of laser generation, J grades of pulse energy of pulsed laser output provide a solution.
The present invention is compound by Hollow-Core Photonic Crystal Fibers and multicore photonic crystal optical fiber progress, by Hollow-Core Photonic Crystal Fibers
High damage threshold and the non-linear conjunction beam of multicore photonic crystal optical fiber be combined, the two complements each other, functionally mutual branch
The advantages of holding, the two be fully retained, while overcoming respective use and limiting, the resultant effect of generation is substantially better than therein
The summation of photonic crystal fiber effect limits laser energy by multicore photonic crystal optical fiber damage threshold, single mode is swashed
Light pulse peak power amplification is exported to GW grades or mean power amplification output to 100kW grades.
Joule grade nanosecond optical-fiber laser will have important application in many aspects.First is that for current joule grade laser application system
System provides high reliability, compact, maintenance-free feature laser light source, extends the application of high energy pulse laser；Second is that promoting relevant
Amplify the development of the large-scale superlaser driving devices based on optical-fiber laser such as network, fiber amplifier network；Third is that promoting newly to answer
Generation.The diameter of hollow core 4 is some tens of pm, and the pulse energy of joule grade will generate significant energy density,
Various gases can be filled in hollow core 4 simultaneously, high energy density laser and various gases there will be physics abundant to imitate
It answers, generates new application.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (5)
1. a kind of multicore photonic crystal optical fiber of hollow-solid composite, which is characterized in that ecto-entad successively include: protective layer,
Covering and fibre core, the fibre core include solid gain core and hollow core, and pumping laser and signal laser are coupled into sky
In the heart-solid composite multicore photonic crystal optical fiber, by the bore of spacing, solid gain core to solid gain core,
The air pore structure of solid gain core or the adjusting of signal laser, it is more after signal laser is amplified in solid gain core
Non-linear conjunction beam occurs for the signal laser in a solid gain core, and the signal laser in multiple solid gain cores is put in gain
It is coupled into hollow core while big, the length of the multicore photonic crystal optical fiber of hollow-solid composite is the of signal laser
The length of one coupling period；
Covering forms micro- stomata around hollow core, and the covering with micro- stomata and hollow core are formed and hollow photon crystal light
Fine identical structure, hollow core are used for transmission high energy signal laser, rule row are equipped in the covering around solid gain core
Micro- stomata of column, the covering with regularly arranged micro- stomata and solid gain core form identical as big core diameter photonic crystal fiber
Structure.
2. the multicore photonic crystal optical fiber of hollow-solid composite according to claim 1, which is characterized in that described hollow
Photonic crystal fiber is kagom é structured optical fiber.
3. the multicore photonic crystal optical fiber of hollow-solid composite according to claim 1, which is characterized in that described hollow
It is vacuum in fibre core.
4. the multicore photonic crystal optical fiber of hollow-solid composite according to claim 1, which is characterized in that described solid
Gain core is evenly distributed around hollow core.
5. the multicore photonic crystal optical fiber of hollow-solid composite according to claim 1 to 4, which is characterized in that institute
State covering structure identical with the solid gain core formation and big core diameter photonic crystal fiber.
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| CN201510967177.3A CN105403951B (en) | 2015-12-22 | 2015-12-22 | The method of the multicore photonic crystal optical fiber and its laser amplifier of hollow-solid composite |
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| CN105403951B true CN105403951B (en) | 2018-12-28 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2601918B (en) * | 2018-08-08 | 2023-02-22 | Univ Southampton | Hollow core optical fibre |
| JP7333822B2 (en) * | 2018-10-03 | 2023-08-25 | ルメニシティ・リミテッド | Optical fiber assembly and method of use |
| CN109818241B (en) * | 2019-01-14 | 2023-11-17 | 中国工程物理研究院激光聚变研究中心 | High-power supercontinuum laser system |
| CN115291318B (en) * | 2021-11-10 | 2024-04-16 | 兰州理工大学 | 19-core ultralow-loss dispersion compensation multi-core photonic crystal fiber |
| CN114879302B (en) * | 2022-05-17 | 2024-01-12 | 上海光织科技有限公司 | Hollow optical fiber structure |
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|---|---|---|---|---|
| CN101631751A (en) * | 2006-12-07 | 2010-01-20 | 西里特克光纤公司 | Make method, preform, optical fiber and the amplifier of preform |
| CN101836143A (en) * | 2007-10-03 | 2010-09-15 | 巴斯大学 | Hollow-core photonic crystal fibre |
| US20120082410A1 (en) * | 2010-09-30 | 2012-04-05 | Xiang Peng | Hybrid Waveguide Device in Powerful Laser Systems |
| GB2518419A (en) * | 2013-09-20 | 2015-03-25 | Univ Southampton | Hollow-core photonic bandgap fibers and methods of manufacturing the same |
| CN205246931U (en) * | 2015-12-22 | 2016-05-18 | 中国工程物理研究院激光聚变研究中心 | Multicore photonic crystal optic fibre of hollow - solid complex |
-
2015
- 2015-12-22 CN CN201510967177.3A patent/CN105403951B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101631751A (en) * | 2006-12-07 | 2010-01-20 | 西里特克光纤公司 | Make method, preform, optical fiber and the amplifier of preform |
| CN101836143A (en) * | 2007-10-03 | 2010-09-15 | 巴斯大学 | Hollow-core photonic crystal fibre |
| US20120082410A1 (en) * | 2010-09-30 | 2012-04-05 | Xiang Peng | Hybrid Waveguide Device in Powerful Laser Systems |
| GB2518419A (en) * | 2013-09-20 | 2015-03-25 | Univ Southampton | Hollow-core photonic bandgap fibers and methods of manufacturing the same |
| CN205246931U (en) * | 2015-12-22 | 2016-05-18 | 中国工程物理研究院激光聚变研究中心 | Multicore photonic crystal optic fibre of hollow - solid complex |
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