CN206422379U - It is a kind of based on the Compound Cavity structured optical fiber oscillator with pump technology - Google Patents
It is a kind of based on the Compound Cavity structured optical fiber oscillator with pump technology Download PDFInfo
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- CN206422379U CN206422379U CN201720074246.2U CN201720074246U CN206422379U CN 206422379 U CN206422379 U CN 206422379U CN 201720074246 U CN201720074246 U CN 201720074246U CN 206422379 U CN206422379 U CN 206422379U
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Abstract
The utility model is related to a kind of based on the Compound Cavity structured optical fiber oscillator with pump technology.The oscillator is used with band pump scheme, using 1010nm~1030nm wave band ytterbium-doping optical fiber laser pumping Compound Cavity structured optical fiber oscillators, obtains high power, the output of efficient optical-fiber laser.By with band pump scheme, effectively increasing the pump light source brightness of injection, adding the injecting power of pump light, so as to improve oscillator power output level.Simultaneously, compound cavity configuration is constituted using multiple pairs of raster cascade, nonlinear interaction intensity in optical fiber is effectively reduced by introducing the light of multiple wavelength, and shorten the effective interaction length of nonlinear effect, nonlinear effect threshold value is improved, so as to realize oscillator more high-output power level.
Description
Technical field
It is especially a kind of based on being shaken with the Compound Cavity structured optical fiber with pump technology the present invention relates to a kind of optical fiber laser
Swing device.
Background technology
Optical fiber laser with advantages such as its good beam quality, compact, the heat management facilities of high conversion efficiency, Stability Analysis of Structures,
The fields such as laser medicine, bioengineering, industrial manufacture, national defense construction have broad prospect of application.Current high power optical fibre laser
Realized usually using Yb dosed optical fiber, single fiber single-mode output power is up to 20kW, multimode output power is up to 100kW.Remember above
Record is created by fiber amplifier structure, and for simpler compact its peak power of fiber oscillator device of structure at thousands of watts
Magnitude, 1 micron waveband long wave direction (>1120nm) peak power is only hundreds of watts.With doubly clad optical fiber, fiber grating etc.
The improvement of device making technics, the power of fiber oscillator device is improved constantly, however pump light source luminance shortage, nonlinear effect,
The factors such as optical fiber thermal lensing effect are still its development bottleneck.In order to break through limitation of the pump light source brightness to power ascension, in recent years
Carry out researcher and propose that, with band pump scheme, the program produces the higher optical fiber of brightness first with conventional semiconductor laser pumping
Laser, then the higher optical-fiber laser of pumping generation brightness is continued with the laser of generation, so effectively carried by secondary pumping process
The high brightness of pump light source, adds the injecting power of pump light.Meanwhile, pump light is in Doped ions with shoot laser
In same energy band, its wavelength difference is smaller, reduces the Excited state in conversion process of energy, and the heat that can alleviate in optical fiber is born
Load.Therefore huge advantage is shown in optical-fiber laser more power output facet with band pump scheme.
Although with having larger power ascension potentiality with pump scheme, oscillator power still can be by non-linear effect
The restriction answered.In fiber oscillator device structure, easily produce stimulated Raman scattering when laser power density is higher in optical fiber, be excited
The nonlinear effects such as Brillouin scattering, cause most of energy transfer to stokes light, not only have impact on signal in oscillator
The growth of luminous power, and the stokes light of reverse transfers can safely threaten to backing system.If in an oscillator
Compound Cavity is constituted using multiple pairs of raster simultaneously, not only nonlinear interaction in optical fiber is effectively reduced by introducing the light of multiple wavelength
Intensity, and the effective interaction length of nonlinear effect is shortened, nonlinear effect threshold value is improved, therefore be possible to realize vibration
Device more high-output power level.
The content of the invention
It is an object of the invention to provide a kind of based on the compound cavity configuration high-power fiber oscillator with pumping.
The present invention is achieved through the following technical solutions：
It is a kind of based on the compound cavity configuration high-power fiber oscillator with pump technology, utilize semiconductor laser pump
Pu, obtains 1010nm~1030nm wave band ytterbium-doping optical fiber lasers, recycles what two pairs of its pumping or multipair fiber grating were constituted
Compound Cavity structured optical fiber oscillator, effectively improves nonlinear effect threshold value, realizes the optical-fiber laser output of more power.
Specifically, the structure of 1010nm~1030nm ytterbium-doping optical fiber lasers includes the pumping laser being sequentially connected
The high anti-fiber grating of device, prime power beam combiner, 1010nm~1030nm, Double Cladding Ytterbium Doped Fiber and 1010nm~1030nm are low
Anti- fiber grating.
The structure of the Compound Cavity structured optical fiber oscillator is λ including power beam combiner, the centre wavelength being sequentially connected1、
λ2、……λnHigh anti-fiber grating, Double Cladding Ytterbium Doped Fiber, the passive optical fiber of double clad, the centre wavelength that is sequentially connected be
λn、……λ2、λ1Low anti-fiber grating.Wherein, high anti-fiber grating, the wavelength of low anti-fiber grating are located at 1 micron waveband model
Enclose, central wavelength lambda1、λ2、……λn(n >=2) incremented by successively, and adjacent wavelength wavelength interval in Raman gain spectral limit
It is interior.
The pump laser can be the semiconductor laser that operation wavelength is 976nm or 915nm.
The prime power beam combiner can be the bundling device (n is positive integer) of n × 1, and pumping arm optical fiber should be with prime
The optical fiber of pump laser output end matches.
The power beam combiner can be the bundling device (n is positive integer) of n × 1, and pumping arm optical fiber should with 1010nm~
The optical fiber of the low anti-fiber grating of 1030nm ytterbium-doping optical fiber lasers matches.
The centre wavelength of high anti-fiber grating, low anti-fiber grating in the Compound Cavity structured optical fiber oscillator can be
1 micron waveband is selected, while meeting in the range of the emission spectra of ytterbium ion；High anti-fiber grating and low reflective fine grating quantity phase
Together, and centre wavelength correspond；Fiber grating quantity can be 2 pairs or multiple pairs of raster；The adjacent fiber grating of wavelength, its ripple
Length is spaced in the range of raman gain spectrum.Calculation formula：
Wherein, Δ υ is the Raman frequency shift in silicon matrix optical fiber, and value is in 13.2THz or so；C is the light velocity.
Passive optical fiber in described Compound Cavity structured optical fiber oscillator, its length has certain value, or 0.
The present invention work process be：
First with semiconductor laser pumping, the high power Yb dosed optical fiber for obtaining centre wavelength in 1010nm~1030nm swashs
Light, Compound Cavity structured optical fiber oscillator is injected using the laser as pumping source.The compound cavity configuration constituted with two pairs of fibre grating
Exemplified by, due to fiber grating frequency-selecting act on, can be produced in the Yb dosed optical fiber of intracavitary the laser of two wavelength, i.e. flashlight with
Raman light.Due to the gain characteristic of ytterbium ion, gain of the Raman light in Yb dosed optical fiber is smaller, and flashlight is in Yb dosed optical fiber
Gain is larger.When pump power is relatively low, flashlight starting of oscillation first simultaneously obtains main gain.And in passive optical fiber, in Raman effect
In the presence of answering, flashlight will gradually be converted to Raman light, realize that high power laser light is exported.It is compound that multipair fiber grating is cascaded
Cavity configuration similarly, by multiple Raman frequency shift may finally obtain high power optical fibre laser and export.
The solution have the advantages that：
The present invention is combined cavity configuration hybrid gain optical fiber using the pumping of 1010nm~1030nm wave band ytterbium-doping optical fiber lasers
Oscillator, obtains high power, the output of efficient optical-fiber laser.By with band pump scheme, effectively increasing the pumping of injection
Light-source brightness, adds the injecting power of pump light, so as to improve laser output power level.Meanwhile, utilize multipair optical fiber
Raster chart constitutes compound cavity configuration, and nonlinear interaction intensity in optical fiber is effectively reduced by introducing the light of multiple wavelength, and
And the effective interaction length of nonlinear effect is shortened, nonlinear effect threshold value is improved, so as to realize oscillator more height output work(
Rate level.
Brief description of the drawings
Fig. 1 for the present invention in be used for 1010nm~1030nm ytterbium-doping optical fiber lasers with pumping structural representation
Figure, Fig. 2 for the present invention in based on the structural representation with the Compound Cavity structured optical fiber laser with pumping；
Wherein each label is represented：
1-1：1# pump lasers；1-2：2# pump lasers；1-3：3# pump lasers；1-4：4# pump lasers；
1-5：5# pump lasers；1-6：6# pump lasers；1-7：7# pump lasers；1-8：Prime power beam combiner；1-9：
The high anti-fiber gratings of 1010nm~1030nm；1-10：Double Cladding Ytterbium Doped Fiber；1-11：The low reflective fine light of 1010nm~1030nm
Grid；1-a：1#1010nm~1030nm ytterbium-doping optical fiber lasers；1-b：2#1010nm~1030nm ytterbium-doping optical fiber lasers；1-c：
3#1010nm~1030nm ytterbium-doping optical fiber lasers；1-d：4#1010nm~1030nm ytterbium-doping optical fiber lasers；1-e：5#
1010nm~1030nm ytterbium-doping optical fiber lasers；1-f：6#1010nm~1030nm ytterbium-doping optical fiber lasers；1-g：7#1010nm
~1030nm ytterbium-doping optical fiber lasers；2：Power beam combiner；3：Wavelength is λ1High anti-fiber grating：4：Wavelength is λnHeight it is anti-
Fiber grating；5：Double Cladding Ytterbium Doped Fiber；6：The passive optical fiber of double clad；7：Wavelength is λnLow anti-fiber grating；8：Wavelength is λ1
Low anti-fiber grating.Wherein grating quantity can be 2 pairs or multipair, i.e. n >=2.
Embodiment
The present invention is combined cavity configuration hybrid gain optical fiber using the pumping of 1010nm~1030nm wave band ytterbium-doping optical fiber lasers
Oscillator, obtains high power, the output of efficient optical-fiber laser.By with band pump scheme, efficiently solving pump light source bright
The problem of spending inadequate, adds the injecting power of pump light, so as to improve oscillator power output level.Meanwhile, using multipair
Raster chart constitutes compound cavity configuration, and nonlinear interaction intensity in optical fiber is effectively reduced by introducing the light of multiple wavelength, and
And the effective interaction length of nonlinear effect is shortened, nonlinear effect threshold value is improved, so as to realize laser more height output work(
Rate level.
It is used for the structural representation with 1010nm~1030nm ytterbium-doping optical fiber lasers with pumping in reference picture 1, the present invention
Figure, the structure based on 1010nm~1030nm ytterbium-doping optical fiber lasers includes pump laser, the prime work(being sequentially connected
The high anti-fiber grating 1-9 of rate bundling device 1-8,1010nm~1030nm, Double Cladding Ytterbium Doped Fiber 1-10,1010nm~1030nm are low
Anti- fiber grating 1-11.Wherein pump laser is 7, respectively 1# pump lasers 1-1,2# pump lasers 1-2,3# pump
Pu laser 1-3,4# pump laser 1-4,5# pump laser 1-5,6# pump laser 1-6,7# pump laser 1-7.
Reference picture 2, the present invention in based on the structural representation with the Compound Cavity structured optical fiber oscillator with pumping, it is described
1010nm~1030nm for being sequentially connected included based on the structure with the Compound Cavity structured optical fiber oscillator with pumping mix ytterbium light
Fibre laser, power beam combiner 2, wavelength are λ1High anti-fiber grating 3, wavelength be λnHigh anti-fiber grating 4, double clad mixes
The passive optical fiber 6 of ytterbium optical fiber 5, double clad, wavelength are λnLow anti-fiber grating 7, wavelength be λ1Low anti-fiber grating 8.Wherein make
With 7 1010nm~1030nm ytterbium-doping optical fiber lasers, respectively 1#1010nm~1030nm ytterbium-doping optical fiber lasers 1-a, 2#
1010nm~1030nm ytterbium-doping optical fiber lasers 1-b, 3#1010nm~1030nm ytterbium-doping optical fiber lasers 1-c, 4#1010nm~
1030nm ytterbium-doping optical fiber lasers 1-d, 5#1010nm~1030nm ytterbium-doping optical fiber lasers 1-e, 6#1010nm~1030nm mix
Ytterbium optical fiber laser 1-f, 7#1010nm~1030nm ytterbium-doping optical fiber lasers 1-g.High anti-/ low anti-fiber grating can be two pairs
Or multiple pairs of raster, i.e. n >=2.
All the above device all-fiber, each device is formed a whole by fused fiber splice.Pass through
976nm diode-end-pumpeds 1010nm~1030nm ytterbium-doping optical fiber lasers, obtains high-power 1010nm~1030nm
Yb dosed optical fiber laser is exported, using this micron waveband Compound Cavity structured optical fiber oscillator of laser pump (ing) 1, obtains 1 micron waveband high
Fiber optic power laser is exported.
Embodiment is illustrated：
Illustrated so that two pairs of fibre optical grating constitution is based on the Compound Cavity structured optical fiber oscillator with pumping as an example.It is first
First with the ytterbium-doping optical fiber laser that 976nm diode-end-pumpeds centre wavelength is 1018nm, wherein：Single 976nm half
Conductor laser power output is up to 200W, and output tail optical fiber is 105 μm of core diameter, 125 μm of inner cladding diameter (105/125 μm)
Multimode fibre；Using 7 976nm semiconductor lasers as pumping source, pump light is noted via 7 × 1 prime power beam combiners
Enter in 1018nm ytterbium-doping optical fiber lasers；The high reflective grid reflectivity of 1018nm is 99%, effective bandwidth 2nm, low anti-optical grating reflection
Rate 15%, effective bandwidth 0.7nm；Double Cladding Ytterbium Doped Fiber uses 20/130 μm of doubly clad optical fiber, in 976nm absorption coefficient
It is 6dB/m, 4 meters of length；1018nm ytterbium-doping optical fiber laser power outputs are up to 1000W.7 1018nm optical fiber lasers are led to
Cross 7 × 1 power beam combiners and synthesize a branch of output, output optical fibre is 200/220 μm of optical fiber.Single laser output power is reachable
1000W, the single-path optical fiber laser that 7000W or so can be obtained by closing beam is exported.The high power of beam output will finally be closed
1018nm optical-fiber lasers injection 1070nm/1120nm is combined cavity optical fibre laser, wherein, the high reflective fine optical grating reflection rates of 1070nm
99%th, bandwidth 2nm, low reflective fine optical grating reflection rate 50%, bandwidth 1nm；The high reflective fine optical grating reflection rates 99% of 1120nm, bandwidth
2nm, low reflective fine optical grating reflection rate 50%, bandwidth 1nm；Yb dosed optical fiber is 20/400 μm of doubly clad optical fiber, length 15m；Quilt
Dynamic optical fiber is 20/400 μm, length 30m.According to 60% conversion efficiency, 4200W or so 1120nm optical-fiber lasers can be obtained
Output.
The scheme for carrying out pumping with the diode-end-pumped source using 976 nanometers is contrasted：It is assumed that equally using
Power output is up to 200 watts or so of 976 nm semiconductor lasers (tail optical fiber be 105/125 micron), by above-mentioned 7 ×
1 power beam combiner can obtain about 1400 watts altogether of pump power, the 976nm pump lights injection single ripples of 1070nm obtained by use
Long optical fibers oscillator.Even if also according to 60% conversion efficiency, (theoretical calculation shows with the power output with pump laser
It is higher than result during 976nm pumpings with efficiency), it also can only obtain about 800 watts of 1070nm power outputs, only 1018nm pumpings
/ 5th or so of the power output that scheme is obtained.By contrast it can be seen that the present invention swashs in acquisition high power Yb dosed optical fiber
Clear superiority in light output.
With based on with pumping standard fiber oscillator structure contrast：It is assumed that equally using 7 1018nm optical-fiber lasers
Device synthesizes a branch of output by 7 × 1 power beam combiners, can obtain about 7000W pump power.The high power of beam output will be closed
1018nm optical-fiber lasers inject the fiber oscillator device of single 1070nm wavelength, because the nonlinear effect in optical fiber will be in pumping work(
Rate produces Raman light when being 4000W or so, even if according to 70% conversion efficiency, also can only obtain about 2800W's or so
1070nm power outputs, Raman luminous power will be improved constantly when hereafter continuing to increase pump power, 1070nm laser powers after
It is continuous to increase limited.And for 1070nm/1120nm Compound Cavity structured optical fiber lasers, due to introducing the light of multiple wavelength, it is assumed that
In the case of general power identical, the Raman action intensity reduction of different wave length laser.Another aspect optical maser wavelength is longer, and Raman increases
Beneficial coefficient is smaller, and such Raman threshold also can be higher.When the calculated results show with band pump laser power as 7000W or so
Compound Cavity structured optical fiber oscillator can obtain 4200W or so 1120nm optical-fiber lasers output, be single 1070nm wavelength lights
Fine 1.5 times or so of oscillator power output.Thus the visible compound cavity configuration of result improves stimulated Raman scattering threshold value, realizes power
The advantage of lifting.
Claims (5)
1. it is a kind of based on the Compound Cavity structured optical fiber oscillator with pump technology, it is characterised in that：Utilize semiconductor laser
Pumping, obtains 1010nm~1030nm wave band ytterbium-doping optical fiber lasers, reuses the compound of the multipair fiber grating composition of its pumping
Cavity configuration fiber oscillator device, effectively improves nonlinear effect threshold value, realizes the optical-fiber laser output of more power；
Pump laser, the prime power that the structure of 1010nm~1030nm ytterbium-doping optical fiber lasers includes being sequentially connected are closed
The high anti-fiber grating of beam device, 1010nm~1030nm, Double Cladding Ytterbium Doped Fiber and the low anti-fiber gratings of 1010nm~1030nm；
The structure of the Compound Cavity structured optical fiber oscillator is λ including power beam combiner, the centre wavelength being sequentially connected1、
λ2、……λnHigh anti-fiber grating, Double Cladding Ytterbium Doped Fiber, the passive optical fiber of double clad, the centre wavelength that is sequentially connected be
λn、……λ2、λ1Low anti-fiber grating, wherein, high anti-fiber grating, low anti-fiber grating wavelength be located at 1 micron waveband model
Enclose, central wavelength lambda1、λ2、……λnIt is incremented by successively, n >=2, and adjacent wavelength wavelength interval in the range of raman gain spectrum.
2. according to claim 1 a kind of based on the Compound Cavity structured optical fiber oscillator with pump technology, its feature exists
In：The pump laser is the semiconductor laser that operation wavelength is 976nm or 915nm.
3. according to claim 1 a kind of based on the Compound Cavity structured optical fiber oscillator with pump technology, its feature exists
In：Described prime power beam combiner is the bundling device of n × 1, and n is positive integer, and pumping arm optical fiber is exported with pump laser
The optical fiber at end matches.
4. according to claim 1 a kind of based on the Compound Cavity structured optical fiber oscillator with pump technology, its feature exists
In：Described power beam combiner is the bundling device of n × 1, and n is positive integer, and pumping arm optical fiber mixes ytterbium with 1010nm~1030nm
The optical fiber of the low anti-fiber grating of optical fiber laser matches.
5. according to claim 1 a kind of based on the Compound Cavity structured optical fiber oscillator with pump technology, its feature exists
In：The centre wavelength of high anti-fiber grating and low anti-fiber grating in described Compound Cavity structured optical fiber oscillator is at 1 micron
Waveband selection, while meeting in the range of the emission spectra of ytterbium ion；High anti-fiber grating is identical with low reflective fine grating quantity, and
Centre wavelength is corresponded；Fiber grating quantity is 2 pairs or multiple pairs of raster.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711747A (en) * | 2017-01-19 | 2017-05-24 | 中国人民解放军国防科学技术大学 | In-band pumping technology-based composite cavity structure fiber oscillator |
| CN111934179A (en) * | 2020-09-03 | 2020-11-13 | 中国人民解放军国防科技大学 | Ytterbium-doped fiber laser using specific wavelength band pump |
-
2017
- 2017-01-19 CN CN201720074246.2U patent/CN206422379U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711747A (en) * | 2017-01-19 | 2017-05-24 | 中国人民解放军国防科学技术大学 | In-band pumping technology-based composite cavity structure fiber oscillator |
| CN111934179A (en) * | 2020-09-03 | 2020-11-13 | 中国人民解放军国防科技大学 | Ytterbium-doped fiber laser using specific wavelength band pump |
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