CN103825190B - The method and device of high-energy basic mode laser is exported based on stimulated Brillouin scattering technology in large core fiber - Google Patents
The method and device of high-energy basic mode laser is exported based on stimulated Brillouin scattering technology in large core fiber Download PDFInfo
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Abstract
Export the method and device of high-energy basic mode laser based on stimulated Brillouin scattering technology in large core fiber, belong to optical field, the present invention is that to solve the problems, such as in large core fiber that output high-energy list basic mode laser has pumping utilization rate not high.The inventive method is：Space laser is pump light and seed light by beam splitting；Pump light coupled injection fibre circulator, and inject large core fiber；Seed light coupled injection single-mode fiber, carries out phase-modulation to seed light, produces Stokes shift, forms seed light after modulation；Single-mode fiber and large core fiber center be aligned are welded together, after modulation, seed light enters big core core optical fibers from single-mode fiber, and meet with pump light, large core fiber is proceeded to the high-energy that pump light has in the seed light of basic mode form using the method that stimulated Brillouin scattering is amplified, obtains high-energy basic mode laser after stimulated Brillouin scattering and exported by optical fiber circulator.
Description
Technical field
The present invention relates to a kind of high-energy basic mode laser output method, belong to optical field.
Background technology
Optical fiber laser has the advantage that much other laser instrument hardly match, such as：High-output power, high pumping conversion effect
Rate, wideband gain, good transverse mode stability and be easy to radiating etc., are very powerful and exceedingly arrogant in research now.However, due to
Optical fiber bore is minimum, so conventional fiber damage threshold is very low, and is susceptible to nonlinear effect, and this makes the output work of optical fiber
Rate is extremely restricted.By increasing optical fiber core diameter, can effectively overcome these problems, but increase optical fiber core diameter and can make output again
The many modellings of light beam, are greatly reduced beam quality.
Recent two decades come, and in order to obtain single-mode output light in large core fiber, have been presented for all multi-schemes at present, but all
Each defective.For example, last century Mo, doubly clad optical fiber is because carrying high power output and keep single basic mode output light to obtain wide
General research and application, but, in doubly clad optical fiber, flashlight still can only transmit in tiny fibre core, can not meet existing
The demand of modern optical fiber laser high power.A kind of method is had to be the high-order filtering out by curved fiber in large core fiber
Pattern, thus obtaining preferable output beam, but this method can bring a lot of light loss, not only extremely inefficient, also runs counter to
Purport that optical fiber laser high power high energy quantifies is it is difficult to application.A kind of approach is also had to utilize LPFG big
Optionally excite the transmission mode wanted in core optical fibers, by grating or holographic plate, transmission light can also be reduced into simultaneously
Basic mode light.Although the scene that this method is effectively utilized large core fiber is amassed, also do not provide amplifying technique, at no distant date also
It is difficult to the demand of optical fiber laser high energy quantization.Large mode field area fiber (LMA) can export in compared with large core fiber
Single-mode laser, also gets the attention in recent years, but at present this method all can only accomplish tens micron dimension core diameters
Optical fiber, output energy on still receive certain restriction.In addition, University of Southampton is existed by the method that cone is drawn in welding
Accurately excite basic mode light in hundred micron dimension large core fibers, extremely attract eyeball.But in their scheme also without
There is provided any amplification mechanism, its output beam energy still only has general single mode fiber level at present.
On the whole, optical fiber core diameter is typically all only carried by the method for basic mode laser output single in large core fiber in the past
Height arrives some tens of pm core diameter magnitude, and the laser energy that can bear is also very limited, and pumping utilization rate is not very high, typically not
More than 80%.
Content of the invention
The invention aims in solution large core fiber there is pumping utilization rate not in output high-energy list basic mode laser
A kind of high problem, there is provided side exporting high-energy basic mode laser based on stimulated Brillouin scattering technology in large core fiber
Method and device.
The side exporting high-energy basic mode laser based on stimulated Brillouin scattering technology in large core fiber of the present invention
Method, the method is：
Space laser is pump light and seed light by beam splitting；
Pump light coupled injection fibre circulator, and large core fiber is injected by optical fiber circulator；
Seed light coupled injection single-mode fiber, then carries out phase-modulation to the seed light of injection, produces Stokes
Frequency displacement, forms seed light after modulation；
Single-mode fiber and large core fiber center be aligned, are linked together using burning-on method, or again using drawing cone after welding
Method is processed；
After modulation, seed light enters big core core optical fibers from single-mode fiber, and meets with pump light, in large core fiber
Using the method that stimulated Brillouin scattering is amplified, the high-energy that pump light has is proceeded in the seed light of basic mode form, through being excited
Light beam after Brillouin scattering is exported by optical fiber circulator, obtains high-energy basic mode laser.
Realize the described method exporting high-energy basic mode laser based on stimulated Brillouin scattering technology in large core fiber
Device include light source, beam splitter, the first bonder, the second bonder, the first large core fiber, the first single-mode fiber, optical fiber
Circulator, the second large core fiber, the second single-mode fiber, phase-modulator and reflecting mirror；
The spatial beam of light source output is incident to beam splitter, forms transmitted light beam and the reflected beams through beam splitter；
Described transmitted light beam forms pump light by the first bonder coupled to the first large core fiber, the first large core fiber
The A mouth of the Pu pump light injection fibre circulator of output, Pu pump light exports from the B mouth of optical fiber circulator and is incident to second largest core diameter
In optical fiber；
Described the reflected beams are incident to reflecting mirror, are coupled to first by the light beam of reflecting mirror reflection output through the second bonder
Single-mode fiber forms seed light, exports, and enter the second single-mode fiber, after modulation after the phase modulated device modulation of described seed light
Seed light is injected in the second large core fiber；
Seed light after modulation is met with Pu pump light, the B mouth of injection fibre circulator after amplifying through Brillouin scattering, and by
The C mouth output of optical fiber circulator.
Advantages of the present invention：The invention provides one kind can obtain basic mode output laser side in hundreds of microns of core optical fibers
Method, and export rock-steady structure simply, transformation efficiency is high, and pumping utilization rate is up to 99% in theory.To optical fiber laser high power
Change and there is breakthrough meaning.The inventive method not only makes large core fiber output laser energy high, and, excite and output beam
Stable, repeatability is high, and output beam ensures as basic mode light beam.
Brief description
Fig. 1 is of the present invention to export high-energy basic mode laser in large core fiber based on stimulated Brillouin scattering technology
The light channel structure schematic diagram of device；
Fig. 2 is large core fiber and single-mode fiber docking scheme；
Fig. 3 is the hot spot figure of output high-energy basic mode laser；
Fig. 4 is the oscillogram of incident spatial beam；
Fig. 5 is the oscillogram of output high-energy basic mode laser.
Specific embodiment
Specific embodiment one：With reference to Fig. 1, present embodiment is described, described in present embodiment, is based on excited Brillouin
The method that scattering technology exports high-energy basic mode laser in large core fiber, has Brillouin's frequency difference simultaneously reversely using with seed light
The high-energy pump light of transmission carries out stimulated Brillouin scattering amplification to basic mode seed light；Basic mode kind is excited in large core fiber
The method of sub-light is：Large core fiber and single-mode fiber are connected in the heart；Concrete grammar is：
Space laser is pump light and seed light by beam splitting；
Pump light coupled injection fibre circulator, and large core fiber is injected by optical fiber circulator；
Seed light coupled injection single-mode fiber, then carries out phase-modulation to the seed light of injection, produces Stokes
Frequency displacement, forms seed light after modulation；
Single-mode fiber and large core fiber center be aligned, are linked together using burning-on method, or again using drawing cone after welding
Method is processed；
After modulation, seed light enters big core core optical fibers from single-mode fiber, and meets with pump light, in large core fiber
Using the method that stimulated Brillouin scattering is amplified, the high-energy that pump light has is proceeded in the seed light of basic mode form, through being excited
Light beam after Brillouin scattering is exported by optical fiber circulator, obtains high-energy basic mode laser.
Large core fiber is graded index fiber optic, for example, can adopt square law graded index fiber.
Specific embodiment two：With reference to Fig. 2, present embodiment is described, present embodiment is made into one to embodiment one
Step explanation, single-mode fiber and large core fiber center be aligned, are linked together using burning-on method；Or again using drawing cone method after welding
Processed；
Large core fiber is multimode fibre, and the core diameter of large core fiber is more than or equal to 100 μm.When its cladding diameter
When identical with single mode fiber diameters, dock using to heart welding process, junction forms fusing point 12；As shown in Fig. 2 the two
Cladding diameter is identical, but the core diameter of the two is different.
Provide a specific example：The two cladding diameter is 125 μm, and the core diameter of large core fiber is 105 μm, single
The core diameter of mode fiber is 8.3 μm.Single-mode fiber is aligned with large core fiber center, and welding becomes an optical fiber.
If multimode fibre cladding diameter is more than the cladding diameter of single-mode fiber, the method for cone is drawn by two kinds using welding
Optical fiber connects.
Specific embodiment three：With reference to Fig. 1 to Fig. 5, present embodiment is described, realizes being based on described in embodiment one
Stimulated Brillouin scattering technology exports the device of the method for high-energy basic mode laser in large core fiber, and it includes light source 1, divides
Bundle mirror 2, the first bonder 3, the second bonder 4, the first large core fiber 5, the first single-mode fiber 6, optical fiber circulator 7, second
Large core fiber 8, the second single-mode fiber 9, phase-modulator 10 and reflecting mirror 11；
The spatial beam of light source 1 output is incident to beam splitter 2, forms transmitted light beam and the reflected beams through beam splitter 2；
Described transmitted light beam forms pump light by the first bonder 3 coupled to the first large core fiber 5, the first big core diameter light
The A mouth of the Pu pump light injection fibre circulator 7 of fine 5 outputs, Pu pump light exports and is incident to second from the B mouth of optical fiber circulator 7
In large core fiber 8；
Described the reflected beams are incident to reflecting mirror 11, are coupled through the second bonder 4 by the light beam that reflecting mirror 11 reflects output
Form seed light to the first single-mode fiber 6, export after phase modulated device 10 modulation of described seed light, and enter the second single-mode optics
Fine 9, after modulation, seed light is injected in the second large core fiber 8；
After modulation there is the B mouth of injection fibre circulator 7 after Brillouin scattering in seed light and Pu pump light, and by fiber annular
The C mouth output of device 7.
Light source 1 adopts space laser device.The finite energy that can be reached by current optical fiber laser, space laser device energy
Enough provide larger pump energy, so space laser device is used as light source.It is divided into two bundles：Pump light and seed light, two
The ratio of person is determined by the beam splitting ratio of beam splitter 2.
The length of the first large core fiber 5 and the first single-mode fiber 6 does not need oversize, and only need to complete coupled light beam transmission is
Can.Second large core fiber 8 needs long enough, to ensure seed light and pump light can carry out sufficiently that " excited Brillouin dissipates
Penetrate amplification ".Both light paths should be controlled simultaneously, allow pump light to meet with seed light as early as possible after entering large core fiber, in order to avoid pumping
Light occurs " stimulated Brillouin scattering generation " that energy can not be transferred completely in seed light.Light beam after scattering is from fiber optic loop
The B mouth of shape device 7 enters, and C mouth goes out, and if necessary to as space laser, reusable lens are by its turn for the big energy beam of port C output
Turn to collimated light beam.If can be used directly as optical fiber light.
Single basic mode light after amplification still can keep good single basic mode state, and output beam is as shown in Figure 3.Meanwhile, put
Laser after big maintains and also almost maintains identical waveform with seed light, as shown in Figure 4, Figure 5.
In the mechanism of stimulated Brillouin scattering, pump energy is bigger, and its transformation efficiency is higher.Someone predicts, works as pumping
After energy reaches to a certain degree, transformation efficiency can reach 99%.So under this scheme, energy requirement is bigger, pumping utilization rate is got over
High.In general, in existing fiber amplifier, pumping utilization rate is difficult to more than 80%.In our existing experiments, only
Under the energy that 100 micron optical fibers can bear, pumping utilization rate already exceed 90% indeed it is contemplated that, the introducing of large core fiber
And use, optical fiber can be greatly improved and bear energy, and output energy and pumping utilization rate are brought up to very big degree.
Shown in the Fig. 2 using, after the be aligned of the two center, linked together using burning-on method, its excitation principle and core diameter
Size is unrelated, and the optical fiber of much core diameters can use in theory.We at least can expand to hundreds of micron of core optical fibers, very
To several millimeters of core optical fibers, in order to bear powerful pump energy.So, output beam energy and peak that we can obtain
Value power is all very high.It is envisaged that the energy of tens millijoules under nanosecond pulse, at least can be obtained, under picopulse, at least may be used
Obtain tens megawatts of peak power.In addition, this burning-on method of our uses, once fusion point completes, export every time later
Light beam all can keep same state.Output is stable and simple to operate, extremely has using value and prospect.
Claims (5)
1. the method exporting high-energy basic mode laser based on stimulated Brillouin scattering technology in large core fiber, its feature exists
In the method is：
Space laser is pump light and seed light by beam splitting；
Pump light coupled injection fibre circulator, and large core fiber is injected by optical fiber circulator；
Seed light coupled injection single-mode fiber, then carries out phase-modulation to the seed light of injection, produces Stokes shift,
Form seed light after modulation；
Single-mode fiber and large core fiber center be aligned, are linked together using burning-on method, or again using drawing cone method to enter after welding
Row is processed；
After modulation, seed light enters large core fiber from single-mode fiber, and meets with pump light, using being subject in large core fiber
The high-energy that pump light has is proceeded in the seed light of basic mode form, through excited Brillouin by the method that sharp Brillouin scattering is amplified
Light beam after scattering is exported by optical fiber circulator, obtains high-energy basic mode laser.
2. according to claim 1 high-energy basic mode laser is exported in large core fiber based on stimulated Brillouin scattering technology
Method it is characterised in that large core fiber core diameter be more than or equal to 100 μm.
3. according to claim 1 high-energy basic mode laser is exported in large core fiber based on stimulated Brillouin scattering technology
Method it is characterised in that large core fiber be graded index fiber optic.
4. realize exporting high-energy basic mode laser in large core fiber based on stimulated Brillouin scattering technology described in claim 1
Method device it is characterised in that it include light source (1), beam splitter (2), the first bonder (3), the second bonder (4),
First large core fiber (5), the first single-mode fiber (6), optical fiber circulator (7), the second large core fiber (8), the second single-mode optics
Fine (9), phase-modulator (10) and reflecting mirror (11)；
The spatial beam that light source (1) exports is incident to beam splitter (2), forms transmitted light beam and the reflected beams through beam splitter (2)；
Described transmitted light beam forms pump light by the first bonder (3) coupled to the first large core fiber (5), the first big core diameter light
The A mouth of pump light injection fibre circulator (7) that fine (5) export, pump light is simultaneously incident from the B mouth output of optical fiber circulator (7)
To the second large core fiber (8)；
Described the reflected beams are incident to reflecting mirror (11), and the light beam being exported by reflecting mirror (11) reflection is through the second bonder (4) coupling
It is bonded to the first single-mode fiber (6) and forms seed light, export after phase modulated device (10) modulation of described seed light, and enter second
Single-mode fiber (9), after modulation, seed light is injected in the second large core fiber (8)；
Seed light after modulation and pump light meet, the B mouth of injection fibre circulator (7) after amplifying through Brillouin scattering, and by
The C mouth output of optical fiber circulator (7).
5. according to claim 4 high-energy basic mode laser is exported in large core fiber based on stimulated Brillouin scattering technology
Device it is characterised in that light source (1) adopt space laser device.
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| CN104614093B (en) * | 2015-03-03 | 2017-05-03 | 哈尔滨工业大学 | Bending-insensitive distributed Brillouin optical fiber temperature and strain sensor |
| CN108390243B (en) * | 2018-04-18 | 2023-08-22 | 华南理工大学 | High-order mode Brillouin fiber laser based on few-mode fiber |
| CN113031363A (en) * | 2021-02-07 | 2021-06-25 | 贵州理工学院 | Light beam purification device |
| CN113031160A (en) * | 2021-02-07 | 2021-06-25 | 贵州理工学院 | Light beam purification assembly and device |
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| CN101299081A (en) * | 2007-04-30 | 2008-11-05 | 古河电子北美公司 | Mode-field resizing in optical fibers |
| CN102269908A (en) * | 2011-07-12 | 2011-12-07 | 南昌航空大学 | Simulated Brillouin scattering generating device with preposed continuously pumping beam combiner and simulated Brillouin scattering generating method |
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| CN103542872A (en) * | 2013-10-24 | 2014-01-29 | 华南师范大学 | Distributed optical fiber sensor based on stimulated Brillouin slow light effect and sensing method |
| CN103604450A (en) * | 2013-11-22 | 2014-02-26 | 哈尔滨理工大学 | Seed injection BOTDR distributed optical fiber sensing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20110134940A1 (en) * | 2009-12-08 | 2011-06-09 | Schlumberger Technology Corporation | Narrow linewidth brillouin laser |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299081A (en) * | 2007-04-30 | 2008-11-05 | 古河电子北美公司 | Mode-field resizing in optical fibers |
| CN102269908A (en) * | 2011-07-12 | 2011-12-07 | 南昌航空大学 | Simulated Brillouin scattering generating device with preposed continuously pumping beam combiner and simulated Brillouin scattering generating method |
| CN102313568A (en) * | 2011-08-30 | 2012-01-11 | 杭州布里特威光电技术有限公司 | Distributed optical fiber sensing device for simultaneously detecting Brillouin scattering and Raman scattering |
| CN103542872A (en) * | 2013-10-24 | 2014-01-29 | 华南师范大学 | Distributed optical fiber sensor based on stimulated Brillouin slow light effect and sensing method |
| CN103604450A (en) * | 2013-11-22 | 2014-02-26 | 哈尔滨理工大学 | Seed injection BOTDR distributed optical fiber sensing system |
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