CN209709374U - High-power Raman fiber laser system for selectively exciting high-order mode - Google Patents
High-power Raman fiber laser system for selectively exciting high-order mode Download PDFInfo
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- CN209709374U CN209709374U CN201920932128.XU CN201920932128U CN209709374U CN 209709374 U CN209709374 U CN 209709374U CN 201920932128 U CN201920932128 U CN 201920932128U CN 209709374 U CN209709374 U CN 209709374U
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 139
- 239000000835 fiber Substances 0.000 title claims abstract description 89
- 239000013307 optical fiber Substances 0.000 claims abstract description 55
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- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
Abstract
A high-power Raman fiber laser system for selectively exciting a high-order mode, a 1# seed source outputs seed light of a fundamental mode signal wavelength; the 2# seed source outputs high-order mode high-order Raman wavelength seed light; the output tail fibers of the 1# seed source and the 2# seed source are respectively connected with one input arm of the power beam combiner, each optical fiber laser pumping source in the optical fiber laser pumping source array is respectively connected with other input arms of the power beam combiner, the output arm of the power beam combiner is connected with a Raman optical fiber, the Raman optical fiber is spirally bent to form an amplifier structure, and the tail end of the Raman optical fiber outputs Raman laser through an end cap. The utility model discloses add basic mode signal wavelength seed light and high-order mode high-order raman wavelength seed light simultaneously in raman fiber amplifier, utilize the cascade stimulated raman scattering additionally to produce the high-order raman of high-order mode to guide it forward transmission, the in-process that utilizes raman fiber's bending loss is with high-order mode high-order raman filtering again at the transmission, thereby has reached the effect of restraining high-order raman.
Description
Technical field
The utility model belongs to fiber laser technology field, be related to one kind in high power Raman Fiber Amplifier simultaneously
Inhibit the Optical Maser System of Higher-order Raman using fundamental signal gain and the gain of high-order mode Higher-order Raman.
Background technique
Raman Fiber Amplifier generates laser gain using the stimulated raman scattering in optical fiber, does not have to pumping wavelength
Limitation, and do not influenced by gain saturatiuon, amplified spontaneous emission and photon darkening effect etc., in optic communication, supercontinuum generation
And the key areas extensive application such as the acquisition of special wave band light source, medical treatment.Have benefited from the development of high brightness pump technology, Raman
Fiber amplifier has been realized in the output of multikilowatt continuous laser.Currently, the limitation further power ascension of Raman Fiber Amplifier
Principal element generated from Higher-order Raman, i.e. the corresponding single order stokes light of signal light.This is because working as signal wavelength
When laser power reaches the Threshold pumped power of Higher-order Raman, power is converted to high-order as pump light and is drawn by signal wavelength laser
Graceful wavelength causes output power stagflation even to decline.
Currently, the technology in terms of inhibiting stimulated Raman scattering is broadly divided into three kinds:
One is use gain fibre with wavelength selectivity itself, such as W-type fiber, but this fibre-optical drawing work
Skill is complicated, at high cost, and transmission loss is big (λ=1 μm~7.5dB/km@), and all optical fibre structure relatively difficult to achieve.
Second is using spectrum filtering out property optical device, such as space structure low pass filter, long-period gratings and inclination
Core mode is coupled to 45 degree of cladding mode, polarization maintaining optical fibre dislocation welding technologies etc. by grating.It has the disadvantage that space structure
There are coupling losses for low pass filter, and are not all optical fibre structures, and system stability is lower.Long-period gratings and oblique raster mesh
Before be served only for single injection seeded, rejection ability is limited.45 degree of dislocation welding technologies of polarization maintaining optical fibre are only applicable to linear polarization Raman
Optical fiber laser.
The third is cascaded pump hybrid gain, is used as kind by the signal light and Raman light that inject model identical simultaneously
Son, but cannot not only inhibit the generation even promoted Qian to stimulated Raman scattering to stimulated Raman scattering after can only inhibiting.
Utility model content
In view of the defects existing in the prior art, the utility model provides a kind of high-power Raman of selective excitation high-order mode
Fiber laser system.The utility model utilizes fundamental signal gain and the gain of high-order mode Higher-order Raman to inhibit high-order to draw simultaneously
It is graceful, to greatly improve the threshold value of nonlinear effect in Raman Fiber Amplifier, finally obtain high-power Raman fiber laser
Output.The Higher-order Raman that the utility model is applicable not only to Raman Fiber Amplifier inhibits, or is used for ytterbium doped optical fiber amplifier
Raman inhibit.
To realize the above-mentioned technical purpose, the technical solution of the utility model is:
A kind of high-power Raman fiber laser system of selective excitation high-order mode, including 1# seed source, 2# seed source, light
Fine laser pumping source array, power beam combiner and Raman fiber.
1# seed source exports fundamental signal seed light；2# seed source exports high-order mode Higher-order Raman wavelength seed light；Optical fiber
Laser pumping source array includes multiple optical-fiber laser pumping sources in array distribution；
1# seed source, 2# seed source output tail optical fiber be separately connected an input arm of power beam combiner, optical-fiber laser pump
Each optical-fiber laser pumping source in the array of Pu source is respectively connected to other each input arm of power beam combiner, power beam combiner it is defeated
Arm connects Raman fiber out, and Raman fiber helical buckling forms amplifier architecture, and the end of Raman fiber is exported by end cap draws
Graceful laser.
The utility model injects high-order mode Higher-order Raman seed light by 2# seed source, induces the Higher-order Raman light of generation to be
High-order mode Higher-order Raman light.When Raman fiber helical buckling, the fibre core clad interface of the light of each mode in Raman fiber
Incidence angle can all become larger.Wherein: the order of mode is higher, bigger in the incidence angle of fibre core clad interface, closer to be all-trans
Critical angle is penetrated, corresponding bending loss is bigger.The incidence angle of high-order mode Higher-order Raman light will be close to the cirtical angle of total reflection, high-order mode
The bending loss of Higher-order Raman light is greater than the bending loss of fundamental signal seed light, so that high-order mode Higher-order Raman light generates on one side
It is filtered out on one side, fundamental signal seed light is amplified always, and the inhibition of Higher-order Raman is realized in transmission process.
It is possible to further be directed to the Raman fiber of different structure, different helical buckling diameters is designed, so that high-order mode
The difference of Higher-order Raman light and the bending loss of fundamental signal seed light is bigger, would be even more beneficial to high-order mode Higher-order Raman light in this way
It filters out, the amplification of fundamental signal seed light.This is because when Raman fiber helical buckling diameter is too small, fundamental signal seed
The bending loss of light will also increase, and the difference of the bending loss of such fundamental signal seed light and high-order mode Higher-order Raman light reduces,
It will be unfavorable for the amplification of fundamental signal seed light.
The type of each optical-fiber laser pumping source in the utility model in optical-fiber laser pumping source array is unlimited, and wavelength is not
Limit.Optical-fiber laser pumping source can be optical fiber laser, be also possible to other lasers, such as solid state laser, semiconductor laser
Device etc..Such as select optical fiber laser as optical-fiber laser pumping source, preferred wavelength range 1018nm to 1080nm.It such as selects and partly leads
For body laser as optical-fiber laser pumping source, preferred wavelength range is 915nm to 976nm.
Raman fiber in the utility model is step-refraction index profile fiber or the large mode field light of other index distributions
Fibre, such as W-type fiber, STF optical fiber.
1# seed source in the utility model is fundamental signal seed source, and 2# seed source is high-order mode Higher-order Raman seed
Source, 2# seed source wavelength are located in the corresponding Stokes wave band of 1# seed source wavelength.Such as frequency displacement 13.2THz, it is corresponding to be
Silica fibre maximum Raman gain coefficienct.
2# seed source is high-order mode Higher-order Raman seed source, and high-order mode refers to the transverse mode of LP02 mould or more, high-order mode
Pattern elements are not less than 90%.
The implementation of 2# seed source has: 2# seed source can be directly defeated by the oscillator based on high-order mode fiber grating
High-order mode Higher-order Raman wavelength seed light out.Basic mode Higher-order Raman seed source can also be excited into high-order mode high-order by 2# seed source
It is corresponding such as to add Higher-order Raman wavelength with the junction of Raman fiber in the output arm of power beam combiner for Raman wavelength seed light
Long-period fiber grating, oblique raster or sound cause fiber grating, and the Higher-order Raman seed of basic mode is excited into high-order mode high-order
Raman wavelength seed light.
In order to protect 1# seed source and 2# seed source, can be added on the output tail optical fiber of two seed sources respectively one every
From device, to the influence of light echo after preventing.
The utility model by adjust two seed sources power ratio and Raman fiber helical buckling diameter to
Control laser output characteristic and inhibitory effect.
The fibre core of power beam combiner tail optical fiber and Raman fiber can support the height of Higher-order Raman wavelength in the utility model
The transmission of rank mould.
As optimal technical scheme, the output arm of the power beam combiner in the utility model and the junction of Raman fiber are logical
It crosses fusion point and is connected with fiber grating, the end of Raman fiber, which is connected with to export by end cap after fiber grating by fusion point, draws
Graceful laser.
The utility model, which can also access, carries out Cascaded amplification in next stage amplifier, to obtain higher power.
Compared with prior art, the utility model can generate following technical effect:
The purpose of this utility model is that Higher-order Raman in Raman Fiber Amplifier is inhibited to generate.It is mainly characterized by Raman
Fundamental signal seed light and high-order mode Higher-order Raman wavelength seed light is added simultaneously in fiber amplifier, utilizes cascade excited Raman
Scattering artificially additionally generates the Higher-order Raman of high-order mode, and guides it towards fl transmission, utilizes Raman during transmission
The bending loss of optical fiber again filters out high-order mode Higher-order Raman, not only ensure that the safety of system in this way, but also can be improved high-order drawing
Graceful threshold value, enables power further to be promoted.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment 1.
Fig. 2 is the structural schematic diagram of the utility model embodiment 2.
Specific embodiment
With reference to the accompanying drawing, the embodiments of the present invention is described in further detail.
Since high power Raman Fiber Amplifier generally uses the step index optical fiber of few mould or multimode, what fibre core was supported
Mode includes basic mode and high-order mode；And fiber lengths longer (tens meters or more) need to carry out helical buckling processing, and high-order
The mode field area and bending loss of mould and long wavelength are much larger than basic mode and short wavelength.Therefore, the utility model passes through additional
The basic mode that the Higher-order Raman of excitation high-order mode is able to suppress Higher-order Raman generates, and the Higher-order Raman of the high-order mode of generation again can be
It is filtered out in transmission process later by bending loss, to achieve the effect that inhibit Higher-order Raman, is conducive to signal light
Power further increases.
It referring to Fig.1, is the structural schematic diagram of the utility model embodiment 1.A kind of selective excitation high-order mode it is high-power
Raman fiber laser system, including 1# seed source 1,2# seed source 2, optical-fiber laser pumping source array 3, power beam combiner 4 and
Raman fiber 5.
1# seed source exports fundamental signal seed light；2# seed source exports high-order mode Higher-order Raman wavelength seed light；Optical fiber
Laser pumping source array includes multiple optical-fiber laser pumping sources in array distribution.The utility model is to optical-fiber laser pumping source kind
Class and wavelength all do not require, and can be optical fiber laser, are also possible to other lasers, as solid state laser, semiconductor swash
Light device etc..
1# seed source 1,2# seed source 2 output tail optical fiber on be connected separately with 1# isolator 9,2# isolator 10, isolator
It can protect 1# seed source 1 and 2# seed source 2, prevent by the rear influence to light echo.
1# seed source 1,2# seed source 2 are separately connected an input arm of power beam combiner 4, optical-fiber laser pumping source array
Each optical-fiber laser pumping source in 3 is respectively connected to other each input arm of power beam combiner 4, the output arm of power beam combiner 4
Raman fiber 5 is connected, wherein in the present embodiment: adding high-order in the output arm of power beam combiner 4 and the junction of Raman fiber 5
The corresponding long-period fiber grating of Raman wavelength, oblique raster or sound cause fiber grating 8, and the Higher-order Raman seed of basic mode is swashed
Send out into high-order mode Higher-order Raman wavelength seed light.5 helical buckling of Raman fiber forms amplifier architecture, the end of Raman fiber 5
Raman laser is exported by end cap 6.
High-order mode Higher-order Raman seed light is injected by 2# seed source 2, inducing the Higher-order Raman light of generation is that high-order mode is high
Rank Raman light.When Raman fiber helical buckling, the incidence angle of the light of each mode in the fibre core clad interface of Raman fiber
Will become larger, wherein the incidence angle of high-order mode Higher-order Raman light will close to the cirtical angle of total reflection, high-order mode Higher-order Raman light it is curved
Song loss is greater than the bending loss of fundamental signal seed light, so that high-order mode Higher-order Raman light is filtered out while generating, base
Mould signal seed light is amplified always, and the inhibition of Higher-order Raman is realized in transmission process
1# seed source 1 in the utility model is fundamental signal seed source, and 2# seed source 2 is high-order mode Higher-order Raman seed
Source, 2# seed source wavelength are located in the corresponding Stokes wave band of 1# seed source wavelength.Such as frequency displacement 13.2THz, it is corresponding to be
Silica fibre maximum Raman gain coefficienct.
2# seed source 2 is high-order mode Higher-order Raman seed source, and high-order mode refers to the transverse mode of LP02 mould or more, high-order mode
Pattern elements are not less than 90%.
It is defeated to control laser by the power ratio of two seed sources of adjusting and the helical buckling diameter of Raman fiber
Characteristic and inhibitory effect out.
The fibre core of power beam combiner tail optical fiber and Raman fiber can support the high-order mode of Higher-order Raman wavelength to transmit.
It is the structural schematic diagram of the utility model embodiment 2 referring to Fig. 2.A kind of selective excitation high-order mode it is high-power
Raman fiber laser system, including 1# seed source 1,2# seed source 2, optical-fiber laser pumping source array 3, power beam combiner 4 and
Raman fiber 5.
1# seed source exports fundamental signal seed light；2# seed source exports high-order mode Higher-order Raman wavelength seed light；Optical fiber
Laser pumping source array includes multiple optical-fiber laser pumping sources in array distribution.
1# seed source 1,2# seed source are separately connected an input arm of power beam combiner 4, optical-fiber laser pumping source array 3
In each optical-fiber laser pumping source be respectively connected to other each input arm of power beam combiner 4, the output arm of power beam combiner 4 connects
Raman fiber 5 is connect, wherein in the present embodiment: the output arm of power beam combiner 4 and the junction of Raman fiber 5 are connected by fusion point
It is connected to a fiber grating 7.5 helical buckling of Raman fiber forms amplifier architecture, and the end of Raman fiber 5 is same by fusion point
It is connected with after a fiber grating 7 and raman laser is exported by end cap 6.
The foregoing is merely the preferred embodiments of the utility model, are not intended to limit the utility model, for
For those skilled in the art, various modifications and changes may be made to the present invention.All spirit and original in the utility model
Within then, any modification, equivalent replacement, improvement and so on be should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of high-power Raman fiber laser system of selective excitation high-order mode, it is characterised in that: including 1# seed source, 2#
Seed source, optical-fiber laser pumping source array, power beam combiner and Raman fiber；
1# seed source exports fundamental signal seed light；2# seed source exports high-order mode Higher-order Raman wavelength seed light；Optical-fiber laser
Pumping source array includes multiple optical-fiber laser pumping sources in array distribution；
1# seed source, 2# seed source output tail optical fiber be separately connected an input arm of power beam combiner, optical-fiber laser pumping source
Each optical-fiber laser pumping source in array is respectively connected to other each input arm of power beam combiner, the output arm of power beam combiner
Raman fiber is connected, Raman fiber helical buckling forms amplifier architecture, and the end of Raman fiber exports Raman by end cap and swashs
Light.
2. the high-power Raman fiber laser system of selective excitation high-order mode according to claim 1, it is characterised in that:
1# seed source is fundamental signal seed source, and 2# seed source is high-order mode Higher-order Raman seed source, and 2# seed source wavelength is located at 1# kind
In the corresponding Stokes wave band of component wavelength.
3. the high-power Raman fiber laser system of selective excitation high-order mode according to claim 2, it is characterised in that:
2# seed source is high-order mode Higher-order Raman seed source, and high-order mode refers to the transverse mode of LP02 mould or more, high-order mode pattern elements
Not less than 90%.
4. the high-power Raman fiber laser system of selective excitation high-order mode according to claim 3, it is characterised in that:
2# seed source is achieved in that: high-order mode Higher-order Raman wavelength is directly exported by the oscillator based on high-order mode fiber grating
Seed light.
5. the high-power Raman fiber laser system of selective excitation high-order mode according to claim 3, it is characterised in that:
2# seed source is achieved in that: basic mode Higher-order Raman seed source is excited into high-order mode Higher-order Raman wavelength seed light.
6. the high-power Raman fiber laser system of selective excitation high-order mode according to claim 1, it is characterised in that:
Add an isolator respectively on the output tail optical fiber of 1# seed source and 2# seed source.
7. the high-power Raman fiber laser system of selective excitation high-order mode according to claim 1, it is characterised in that:
The corresponding long-period fiber grating of Higher-order Raman wavelength is added in the output arm of power beam combiner and the junction of Raman fiber, is inclined
Skew ray grid or sound cause fiber grating, and the Higher-order Raman seed of basic mode is excited into high-order mode Higher-order Raman wavelength seed light.
8. the high-power Raman fiber laser system of selective excitation high-order mode according to claim 1, it is characterised in that:
The output arm of power beam combiner and the junction of Raman fiber are connected with fiber grating by fusion point, and the end of Raman fiber is logical
It crosses fusion point and is connected with after fiber grating and raman laser is exported by end cap.
9. swashing according to claim 1 to the high-power Raman fiber of selective excitation high-order mode described in any claim in 8
Photosystem, it is characterised in that: optical-fiber laser pumping source uses optical fiber laser, wave-length coverage 1018nm to 1080nm；
Alternatively, optical-fiber laser pumping source uses solid state laser；
Alternatively, optical-fiber laser pumping source uses semiconductor laser, wave-length coverage is 915nm to 976nm.
10. the high-power Raman fiber laser system of selective excitation high-order mode according to claim 1, feature exist
In: Raman fiber is step-refraction index profile fiber, W-type fiber or STF optical fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920932128.XU CN209709374U (en) | 2019-06-19 | 2019-06-19 | High-power Raman fiber laser system for selectively exciting high-order mode |
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| CN201920932128.XU CN209709374U (en) | 2019-06-19 | 2019-06-19 | High-power Raman fiber laser system for selectively exciting high-order mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265858A (en) * | 2019-06-19 | 2019-09-20 | 中国人民解放军国防科技大学 | High-power Raman fiber laser system for selectively exciting high-order mode |
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2019
- 2019-06-19 CN CN201920932128.XU patent/CN209709374U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265858A (en) * | 2019-06-19 | 2019-09-20 | 中国人民解放军国防科技大学 | High-power Raman fiber laser system for selectively exciting high-order mode |
| CN110265858B (en) * | 2019-06-19 | 2024-04-26 | 中国人民解放军国防科技大学 | High-power Raman fiber laser system capable of selectively exciting high-order modes |
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