CN109167237A - Inhibit the 8KW narrow cable and wide optical fiber laser and its construction method of nonlinear effect - Google Patents
Inhibit the 8KW narrow cable and wide optical fiber laser and its construction method of nonlinear effect Download PDFInfo
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- CN109167237A CN109167237A CN201811231626.8A CN201811231626A CN109167237A CN 109167237 A CN109167237 A CN 109167237A CN 201811231626 A CN201811231626 A CN 201811231626A CN 109167237 A CN109167237 A CN 109167237A
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- fiber laser
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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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
-
- 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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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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
- H01S3/06716—Fibre compositions or doping with active elements
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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
- H01S3/06754—Fibre amplifiers
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
Abstract
The invention discloses it is a kind of inhibit nonlinear effect 8KW narrow cable and wide optical fiber laser and and its construction method, laser includes cascade highly doped DBR narrow linewidth seed source system, 1KW optical-fiber laser amplifying stage and 8KW with band pumping amplifying stage, and the highly doped DBR narrow linewidth seed source system includes sequentially connected first pumping source, the first optical-fiber bundling device, high reflective grid, the first gain fibre, the low reflective grid of narrow linewidth, stripper and two cascade chirp inclined optical fiber gratings.The present invention makes the seed laser for inputting 1KW optical-fiber laser amplifying stage have the high light beam quality and narrow linewidth of nearly diffraction limit, finally realizes the output of 8KW narrow linewidth (10Db spectral bandwidth≤0.8nm) laser.
Description
Technical field
The invention belongs to optical fiber laser fields, and in particular to a kind of 8KW narrow linewidth optical fiber for inhibiting nonlinear effect is sharp
Light device and and its construction method.
Background technique
The narrowband selecting frequency characteristic that narrow linewidth fiber grating has allows to allow to as the hysteroscope of fiber oscillator device
The output of narrow-linewidth laser is realized as narrow linewidth seed source.Also there are many research institutions successively to narrow linewidth optical fiber light in recent years
Research is unfolded as the scheme of seed source in the oscillator of grid composition, and constantly obtains some new breakthroughs.2015, someone used
It is the laser that 0.08nm (10dB) power is 823W that oscillator combination level-one enlarged structure based on narrow linewidth FBG, which realizes line width,
Output.2016, someone was that 0.1nm narrow linewidth grating combines the side for effectively changing fiber lengths and inhibiting spectrum widening using line width
It is 2.9kW that method, which realizes power by level-one amplification, and bandwidth is that the laser of 0.31nm (10dB) exports.2017, someone used
20/400 Yb dosed optical fiber and central wavelength 1080nm, the kind that the narrow band fiber bragg grating building output power of bandwidth 0.1nm is 300W
Component realizes the output of 4kW laser using the method that level-one is amplified, although using having the oblique raster for inhibiting SRS function
The SRS generated in system is inhibited, but fails that the nonlinear effects such as SPM, WFM are carried out effectively to inhibit to lead to output spectrum
10db broadened bandwidth to 3nm (10dB).
In recent years, high-capacity optical fiber laser is grown rapidly, and optical fiber laser is towards high power, high light beam quality
It is continued to develop with narrow bandwidth, the nonlinear effect in optical fiber laser is main as inhibiting optical fiber laser performance to be substantially improved
Factor.The nonlinear effect of optical fiber laser mainly influences longitudinal mode (spectral Dimensions) characteristic of laser, laser can be caused to export
Spectrum occurs serious broadening and simultaneously generates other spectral components, so as to cause signal laser (laser of operating wave strong point) power with
Beam quality declines to a great extent, and destroys the stability of Optical Maser System, it is suppressed that the power and line width of optical fiber laser are horizontal, greatly
Its application in the national defense and military fields such as laser weapon, laser radar, photoelectronic warfare is limited, photoelectricity class army of China is hindered
With the innovation and development of equipment.Therefore, how to inhibit the nonlinear effect of high power narrow linewidth optical fiber laser to become at present should
The research hotspot in field.
Summary of the invention
The purpose of the present invention is to provide a kind of 8KW narrow cable and wide optical fiber lasers, overcome current seed source power and line width
Between contradiction, and a variety of nonlinear effects such as can inhibit stimulated Raman scattering, four-wave mixing, Cross-phase Modulation, from
And the shortcomings that overcoming current single structure inclined optical fiber grating that can only inhibit stimulated Raman scattering, entire laser is substantially improved in pole
Line width under high power conditions is horizontal.
The technical solution for realizing the aim of the invention is as follows: a kind of 8KW narrow linewidth optical-fiber laser inhibiting nonlinear effect
Device, including cascade highly doped DBR narrow linewidth seed source system, 1KW optical-fiber laser amplifying stage and 8KW are the same as band pumping amplification
Grade, the highly doped DBR narrow linewidth seed source system includes sequentially connected first pumping source, the first optical-fiber bundling device, high anti-
The low reflective grid of grating, the first gain fibre, narrow linewidth, stripper and two cascade chirp inclined optical fiber gratings.
Preferably, first pumping source includes 976 pumping sources that 2 power are 100W, the reflection band of high reflective grid
Width is 2.5nm, and central wavelength 1080nm, reflectivity 99%, the first gain fibre length is 20m.
Preferably, the 1KW optical-fiber laser amplifying stage include sequentially connected second pumping source, the second optical-fiber bundling device,
Second gain fibre, stripper and two chirp inclined optical fiber grating cascades.
Preferably, the second pumping source includes 915 pumping sources that 6 power are 200W, and the length of the second gain fibre is
17m, fibre core/cladding diameter are 20/400um, absorption coefficient 1.26dB/m.
Preferably, the 8KW with band pumping amplifying stage include sequentially connected third pumping source, third optical-fiber bundling device,
Third gain fibre, the 4th optical-fiber bundling device, the 4th pumping source, stripper and output collimator.
Preferably, third pumping source includes 1018 pumping sources that 10 power are 500W, the length of third gain fibre
For 23m, fibre core/cladding diameter is 30/600um, and absorption coefficient 1.35dB/m, the 4th pumping source include that 10 power are
1018 pumping sources of 500W.
The present invention also provides a kind of construction methods of 8KW narrow cable and wide optical fiber laser for inhibiting nonlinear effect, specifically
Steps are as follows:
The first step builds highly doped DBR narrow linewidth seed source system, the highly doped DBR narrow linewidth seed source system packet
Include sequentially connected first pumping source, the first optical-fiber bundling device, high reflective grid, gain fibre, the low reflective grid of narrow linewidth, stripper
And two chirp inclined optical fiber grating cascades；
Second step is built 1KW optical-fiber laser amplifying stage, and it is connect with highly doped DBR narrow linewidth seed source system, institute
State 1KW optical-fiber laser amplifying stage include sequentially connected second pumping source, the second optical-fiber bundling device, gain fibre, stripper with
And two chirp inclined optical fiber grating cascades；
Third step builds 8KW with band pumping amplifying stage, and it is connect with 1KW optical-fiber laser amplifying stage, and the 8KW is same
Band pumping amplifying stage include sequentially connected third pumping source, third optical-fiber bundling device, gain fibre, the 4th optical-fiber bundling device,
4th pumping source, stripper and output collimator.
Compared with prior art, the present invention its remarkable advantage are as follows: (1) 8KW narrow cable and wide optical fiber laser middle rank of the invention
Join multiple inclined optical fiber gratings, is able to suppress a variety of non-linear effects such as stimulated Raman scattering, four-wave mixing, Cross-phase Modulation
It answers, so that the shortcomings that overcoming current single structure inclined optical fiber grating that can only inhibit stimulated Raman scattering, is substantially improved entire laser
Line width of device under the conditions of very high power is horizontal；(2) the invention proposes utilize highly doped DBR seed source to produce in MOPA structure
The oscillation mode seed laser of raw number hectowatt grade, sub-nanometer line width, highly doped DBR narrow linewidth optical-fiber laser seed source use doping
Dense gain fibre, the gain fibre length used when so that exporting laser power on an equal basis is extremely short, greatly reduces seed
The quantity of source laser longitudinal mode (spectrum), enables seed source to export the seed laser of hectowatt grade sub-nanometer line width；(2) present invention exists
The amplifying stage that a 1KW is accessed between seed source and 8KW amplifying stage, alleviates the amplification pressure of 8KW amplifying stage, is put by two-stage
The big output for realizing 8KW narrow-linewidth laser.
Detailed description of the invention
Fig. 1 is the schematic diagram for the 8KW narrow cable and wide optical fiber laser that the present invention inhibits nonlinear effect.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing.
As shown in Figure 1, a kind of 8KW narrow cable and wide optical fiber laser for inhibiting nonlinear effect, including cascade highly doped DBR
Narrow linewidth seed source system, 1KW optical-fiber laser amplifying stage and 8KW are the same as band pumping amplifying stage, the highly doped DBR narrow linewidth kind
Component system includes sequentially connected first pumping source, the first optical-fiber bundling device, high reflective grid, the first gain fibre, narrow linewidth
Low reflective grid, stripper and two cascade chirp inclined optical fiber gratings.
In further embodiment, first pumping source includes 976 pumping sources that 2 power are 100W, high reflective
The reflection bandwidth of grid is 2.5nm, and central wavelength 1080nm, reflectivity 99%, the first gain fibre length is 20m.
In further embodiment, the 1KW optical-fiber laser amplifying stage includes sequentially connected second pumping source, the second light
Fine bundling device, the second gain fibre, stripper and two chirp inclined optical fiber grating cascades.
In further embodiment, the second pumping source includes 915 pumping sources that 6 power are 200W, the second gain light
Fine length is 17m, and fibre core/cladding diameter is 20/400um, absorption coefficient 1.26dB/m.
In further embodiment, the 8KW includes sequentially connected third pumping source, third light with band pumping amplifying stage
Fine bundling device, third gain fibre, the 4th optical-fiber bundling device, the 4th pumping source, stripper and output collimator.
In further embodiment, third pumping source includes 1018 pumping sources that 10 power are 500W, third gain
The length of optical fiber is 23m, and fibre core/cladding diameter is 30/600um, and absorption coefficient 1.35dB/m, the 4th pumping source include 10
Power is 1018 pumping sources of 500W.
A kind of construction method for the 8KW narrow cable and wide optical fiber laser inhibiting nonlinear effect, the specific steps are as follows:
The first step builds highly doped DBR narrow linewidth seed source system, the highly doped DBR narrow linewidth seed source system packet
Include sequentially connected first pumping source, the first optical-fiber bundling device, high reflective grid, gain fibre, the low reflective grid of narrow linewidth, stripper
And two chirp inclined optical fiber grating cascades；
Second step is built 1KW optical-fiber laser amplifying stage, and it is connect with highly doped DBR narrow linewidth seed source system, institute
State 1KW optical-fiber laser amplifying stage include sequentially connected second pumping source, the second optical-fiber bundling device, gain fibre, stripper with
And two chirp inclined optical fiber grating cascades；
Third step builds 8KW with band pumping amplifying stage, and it is connect with 1KW optical-fiber laser amplifying stage, and the 8KW is same
Band pumping amplifying stage include sequentially connected third pumping source, third optical-fiber bundling device, gain fibre, the 4th optical-fiber bundling device,
4th pumping source, stripper and output collimator.Final realization 8KW narrow linewidth (10dB spectral bandwidth≤0.8nm) laser
Output.
In conclusion the present invention overcomes the contradictions between current seed source power and line width, and can inhibit to be excited
A variety of nonlinear effects such as Raman scattering, four-wave mixing, Cross-phase Modulation, to overcome current single structure inclined optical fiber grating
It is horizontal that line width of entire laser under the conditions of very high power is substantially improved in the shortcomings that can only inhibiting stimulated Raman scattering.
Present invention employs the very high gain fibres of doping concentration, the gain light used when so that exporting laser power on an equal basis
Fine length is extremely short, effectively restrains the nonlinear effect in seed source laser), to greatly reduce seed source laser longitudinal module (light
Spectrum) quantity, so that seed source is exported the seed laser of hectowatt grade sub-nanometer line width, advantageously reduce subsequent cascaded formula multiclass
The inhibition pressure of type nonlinear effect suppressive high power chirp tilted fiber Bragg grating, to improve whole laser
Nonlinear effect inhibitory effect.
The present invention to seed laser carry out longitudinal mode modulation, thus inhibit filter out nonlinear effect in seed source excited it is non-
Working laser makes the seed laser for inputting amplifying stage have the high light beam quality and narrow linewidth of nearly diffraction limit.It is simultaneously inhibition
Generated nonlinear effect in 1KW optical-fiber laser amplifying stage, system have also accessed cascade connection type oblique light in amplifying stage output end
Fine grating.
Embodiment 1
A kind of 8KW narrow cable and wide optical fiber laser inhibiting nonlinear effect, including highly doped DBR narrow linewidth seed source system
With band pumping amplifying stage, the highly doped DBR narrow linewidth seed source system includes successively by 1KW optical-fiber laser amplifying stage and 8KW
The first pumping source, the first optical-fiber bundling device, the high reflective grid, gain fibre, the low reflective grid of narrow linewidth, stripper and two of connection
A cascade chirp inclined optical fiber grating.First pumping source includes 976 pumping sources that 2 power are 100W, and the first optical fiber closes
Beam device is (2+1) × 1 pump light/signal light combiner, and the reflection bandwidth of high reflective grid is 2.5nm, central wavelength 1080nm,
Reflectivity is 99%, and the first gain fibre length is 20m, fibre core/cladding diameter 10/130um, absorption coefficient 4dB/m, narrow linewidth
Low reflective grid reflection bandwidth is 0.05nm, central wavelength 1080nm, reflectivity 10%, chirp inclined optical fiber grating reflectivity
It is 99%, cladding mode resonant cutting edge of a knife or a sword is 1138nm.
The 1KW optical-fiber laser amplifying stage includes sequentially connected second pumping source, the second optical-fiber bundling device, gain light
Fine, stripper and two chirp inclined optical fiber grating cascades.Second pumping source includes 915 pumpings that 6 power are 200W
Source, the second optical-fiber bundling device are (6+1) × 1 pump light/signal light combiners, and the length of the second gain fibre is 17m, fibre core/
Cladding diameter is 20/400um, absorption coefficient 1.26dB/m.
The 8KW includes sequentially connected third pumping source, third optical-fiber bundling device, gain light with band pumping amplifying stage
Fibre, the 4th optical-fiber bundling device, the 4th pumping source, stripper and output collimator, it is final to realize 8KW narrow linewidth (10dB spectrum
Bandwidth≤0.8nm) laser output.Third pumping source includes 1018 pumping sources that 10 power are 500W, and third optical fiber closes
Beam device is (10+1) × 1 pump light/signal light combiner, and the length of third gain fibre is 23m, and fibre core/cladding diameter is 30/
600um, absorption coefficient 1.35dB/m, the 4th optical-fiber bundling device specification are (10+1) × 1 pump light/signal light combiner, the
Four pumping sources include 1018 pumping sources that 10 power are 500W.
Claims (7)
1. a kind of 8KW narrow cable and wide optical fiber laser for inhibiting nonlinear effect, which is characterized in that including cascade highly doped DBR
Narrow linewidth seed source system, 1KW optical-fiber laser amplifying stage and 8KW are the same as band pumping amplifying stage, the highly doped DBR narrow linewidth kind
Component system includes sequentially connected first pumping source, the first optical-fiber bundling device, high reflective grid, the first gain fibre, narrow linewidth
Low reflective grid, stripper and two cascade chirp inclined optical fiber gratings.
2. the 8KW narrow cable and wide optical fiber laser according to claim 1 for inhibiting nonlinear effect, which is characterized in that described
First pumping source includes 976 pumping sources that 2 power are 100W, and the reflection bandwidth of high reflective grid is 2.5nm, and central wavelength is
1080nm, reflectivity 99%, the first gain fibre length are 20m.
3. the 8KW narrow cable and wide optical fiber laser according to claim 1 for inhibiting nonlinear effect, which is characterized in that described
1KW optical-fiber laser amplifying stage includes sequentially connected second pumping source, the second optical-fiber bundling device, the second gain fibre, stripper
And two chirp inclined optical fiber grating cascades.
4. the 8KW narrow cable and wide optical fiber laser according to claim 3 for inhibiting nonlinear effect, which is characterized in that second
Pumping source includes 915 pumping sources that 6 power are 200W, and the length of the second gain fibre is 17m, and fibre core/cladding diameter is
20/400um, absorption coefficient 1.26dB/m.
5. the 8KW narrow cable and wide optical fiber laser according to claim 1 for inhibiting nonlinear effect, which is characterized in that described
8KW includes sequentially connected third pumping source, third optical-fiber bundling device, third gain fibre, the 4th light with band pumping amplifying stage
Fine bundling device, the 4th pumping source, stripper and output collimator.
6. the 8KW narrow cable and wide optical fiber laser according to claim 1 for inhibiting nonlinear effect, which is characterized in that third
Pumping source includes 1018 pumping sources that 10 power are 500W, and the length of third gain fibre is 23m, fibre core/cladding diameter
For 30/600um, absorption coefficient 1.35dB/m, the 4th pumping source include 1018 pumping sources that 10 power are 500W.
7. a kind of construction method for the 8KW narrow cable and wide optical fiber laser for inhibiting nonlinear effect, which is characterized in that specific steps are such as
Under:
The first step builds highly doped DBR narrow linewidth seed source system, the highly doped DBR narrow linewidth seed source system include according to
First pumping source of secondary connection, the first optical-fiber bundling device, high reflective grid, gain fibre, the low reflective grid of narrow linewidth, stripper and
Two chirp inclined optical fiber grating cascades；
Second step builds 1KW optical-fiber laser amplifying stage, and it is connect with highly doped DBR narrow linewidth seed source system, described
1KW optical-fiber laser amplifying stage include sequentially connected second pumping source, the second optical-fiber bundling device, gain fibre, stripper and
Two chirp inclined optical fiber grating cascades；
Third step builds 8KW with band pumping amplifying stage, and it is connect with 1KW optical-fiber laser amplifying stage, and the 8KW is the same as band pump
Pu amplifying stage includes sequentially connected third pumping source, third optical-fiber bundling device, gain fibre, the 4th optical-fiber bundling device, the 4th
Pumping source, stripper and output collimator.
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| CN201811231626.8A CN109167237A (en) | 2018-10-22 | 2018-10-22 | Inhibit the 8KW narrow cable and wide optical fiber laser and its construction method of nonlinear effect |
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| CN201811231626.8A CN109167237A (en) | 2018-10-22 | 2018-10-22 | Inhibit the 8KW narrow cable and wide optical fiber laser and its construction method of nonlinear effect |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115133386A (en) * | 2022-08-30 | 2022-09-30 | 中国人民解放军国防科技大学 | Narrow-spectrum optical fiber oscillator |
| CN117410810A (en) * | 2023-12-14 | 2024-01-16 | 中国工程物理研究院激光聚变研究中心 | Anti-reflection cascade pump optical fiber laser |
| CN117498132A (en) * | 2023-12-29 | 2024-02-02 | 中国工程物理研究院激光聚变研究中心 | Narrow linewidth fiber laser based on inclined grating |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115133386A (en) * | 2022-08-30 | 2022-09-30 | 中国人民解放军国防科技大学 | Narrow-spectrum optical fiber oscillator |
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| CN117410810A (en) * | 2023-12-14 | 2024-01-16 | 中国工程物理研究院激光聚变研究中心 | Anti-reflection cascade pump optical fiber laser |
| CN117410810B (en) * | 2023-12-14 | 2024-05-28 | 中国工程物理研究院激光聚变研究中心 | Anti-reflection cascade pump optical fiber laser |
| CN117498132A (en) * | 2023-12-29 | 2024-02-02 | 中国工程物理研究院激光聚变研究中心 | Narrow linewidth fiber laser based on inclined grating |
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