CN101320189B - A Non-collinear Serial Beaming Device Based on Stimulated Brillouin Scattering - Google Patents
A Non-collinear Serial Beaming Device Based on Stimulated Brillouin Scattering Download PDFInfo
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- CN101320189B CN101320189B CN2008100649238A CN200810064923A CN101320189B CN 101320189 B CN101320189 B CN 101320189B CN 2008100649238 A CN2008100649238 A CN 2008100649238A CN 200810064923 A CN200810064923 A CN 200810064923A CN 101320189 B CN101320189 B CN 101320189B
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Abstract
一种基于受激布里渊散射的非共线串行组束装置，涉及一种激光的串行组束装置，属于光学领域。它为了克服重叠耦合并行组束和后向注入种子光并行组束结构的系统负载不高，SBS后向反射率较低的缺点，克服独立介质池SBS并行组束对光束的能量稳定性要求很高，同时克服光学元件数量多的问题。本发明n个非共线布里渊放大结构单元组成，非共线布里渊放大结构单元由介质池和光学陷阱组成，种子光沿与介质池平行方向入射至介质池中，抽运光从介质池另一侧入射至介质池中，抽运光与种子光之间夹角为α，介质池中放大种子光后的残余抽运光入射至光学陷阱中，介质池中被抽运光放大后的种子光输出进入下一级非共线布里渊放大结构单元。
The invention discloses a non-collinear serial beam combining device based on stimulated Brillouin scattering, relates to a laser serial beam combining device, and belongs to the field of optics. In order to overcome the low system load of overlapping coupling parallel beams and backward injection seed light parallel beam structures, and the shortcomings of low SBS retroreflectivity, it overcomes the high requirements for the energy stability of beams in independent dielectric pool SBS parallel beams. High, while overcoming the problem of a large number of optical components. The present invention is composed of n non-collinear Brillouin amplification structural units. The non-collinear Brillouin amplification structural unit is composed of a dielectric pool and an optical trap. The other side of the medium cell is incident into the medium cell, the angle between the pumping light and the seed light is α, the residual pumping light after amplifying the seed light in the medium cell enters the optical trap, and the pumping light in the medium cell is amplified The final seed light output enters the next-level non-collinear Brillouin amplification unit.
Description
Technical field
The present invention relates to a kind of serial group bundle device of laser, belong to optical field.
Background technology
Laser beam combination is a kind of by the little energy of multi beam, low power laser being synthesized the technological means of obtaining macro-energy, high power laser light output.At the solid pulse laser of using aspect macro-energy, the superpower laser that mostly is, in the existing beam combination method, be mostly to utilize nonlinear optics phase conjugation principle to realize aspect the solid pulse laser at present.In the parallel beam combination of nonlinear optics phase conjugation principle main a kind of be exactly the parallel beam combination of stimulated Brillouin scattering (SBS is the nonlinear effect that a kind of luminous power with the fl transmission light signal is transferred to rear orientation light and phonon fields) phase conjugation.In the solid pulse laser application facet, the parallel beam combination of SBS phase conjugation mainly is divided into the parallel beam combination of overlapping coupling, (draw from document " present Research of stimulated Brillouin scattering phase conjugate beam combination and development prospect " to injecting the parallel beam combination of seed light the back, the fourth winter jasmine, Lv Zhiwei, work such as Zhao Xiaoyan. laser and optoelectronics progress, 2000,37 (5): 7-12) with the parallel beam combination in standalone media pond.
Parallel beam combination of overlapping coupling and back are to injecting the parallel beam combination of seed light owing to be that multiple laser is focused on same medium pond all, the load centralization of system, more for a long time, the laser energy in the medium pond is too high at the light beam number, other nonlinear effect can be brought, and medium can be broken.Therefore the load that has system is not high, the shortcoming that the SBS retroreflectance is lower.
Fig. 3 has provided the schematic diagram of the parallel beam combination of the overlapping coupled structure of SBS (100).Be polarized beam-splitting board (PBS) (102) from the laser of laser instrument (101) output and be divided into two bundles, wherein a branch of s ripple amplifies by gain media (108) by 45 ° of total reflective mirrors (103) back, enters medium pond (107) by condenser lens (106) then behind quarter-wave plate (being called for short QW) (104).Another bundle p ripple amplifies through gain media (109), enters medium pond (107) by condenser lens (106) then behind QW (105).Two-beam in medium pond (107) thus in owing to have the phase locking that identical acoustic wavefield realizes two-beam.After the back scattering of SBS principle, the s ripple becomes the p ripple behind QW (104), exports by PBS (102) transmission after total reflective mirror (103) reflection by gain media (108) then; The p ripple becomes the s ripple behind QW (105), pass through gain media (109) then after PBS (102) r reflects output.Because the overlapping coupling phase locking of twin-beam in medium, the laser of output is relevant synthetic output.As can be seen from Figure 3, because multiple laser focuses in the same medium pond in the overlapping coupled structure (100), can make the load centralization of system, at the light beam number more for a long time, laser energy in the medium pond is too high, can bring other nonlinear effect, even can break medium.
The parallel beam combination of the overlapping coupling of SBS is to intercouple in the medium pond by two-beam to realize the locking of light beam phase place, is subjected to the lap position of two light beams in the medium pond, and influence such as beam separation is bigger, and reflectivity is not high.On this basis, people have proposed back to injecting the parallel beam combination model of seed light.Fig. 4 has provided behind the SBS to the ultimate principle of injecting the parallel beam combination of seed light structure (200).The other a branch of light of from laser instrument, telling produce by with medium pond (208) in same medium produce a branch of seed light (209), be focused at the locking that seed light 209 that the two-beam in the medium pond (208) draws by the outside realizes phase place.The transmission course of two-beam that is used for beam combination is consistent with Fig. 3.201 is PBS among Fig. 4, and 202 is 45 ° of total reflective mirrors, and 203,204 is gain media, and 205,206 is QW, and 207 is condenser lens..Utilize the back to carry out the method for beam combination to injecting seed light structure (200), the phase locking of two-beam comes down to the reproduction to the seed light phase information, is the amplification process of seed light, is not the phase conjugation process.The problem that same this method also exists system load to concentrate.
At preceding two kinds of characteristics that the method load is not high, the Hong Jin Kong of Korea S KAIST university has proposed parallel beam combination (the Hong Jin Kong of standalone media pond SBS, Seong Ku Lee, Dong Won Lee.Beam combined laser fusion driver with high power and high repetition rate usingstimulated Brillouin scattering phase conjugation mirrors and self-phase-locking.Laser and Particle Beams, 2005,23:55-59), be characterized in, each beamlet adopt one independently the medium pond realize phase conjugation, the load of system is disperseed, but because therefore haveing nothing to do between each standalone media pond need advance accurate control to the energy of each beamlet.But because this kind method is to come the generation time of guide sound wave field by the energy level of control laser beam, therefore the energy stability to light beam requires very high.
Fig. 5 has provided the parallel beam combination schematic diagram of SBS standalone media pool structure (300).In standalone media pool structure (300), the laser beam that participates in beam combination realizes phase locking by medium pond (308,309) and concave mirror (310,311).Detailed process is: the laser beam of fl transmission can with by concave mirror (310,311) the relevant standing wave that forms of the light beam that returns, the generation position of the formation meeting fixed sound wave field of standing wave, and the energy by control bundle can the guide sound wave field generation time, under the situation about all determining in the generation position of acoustic wavefield and time, behind the SBS that has also just determined to produce in the medium pond (308,309) to the phase place of conjugate beam, thereby realized the locking of two light beam phase places.Part outside standalone media pool structure (300), the transmission of light beam is consistent with Fig. 3.Among Fig. 5,301 is laser instrument, and 302 is PBS, and 303 is 45 ° of total reflective mirrors, and 304,305 is gain media, and 306,307 is QW.The problem that exists in this scheme is: owing to be the generation time that comes the guide sound wave field by the energy level of control laser beam, therefore the energy stability to light beam requires very high.
The common problem that the above several structure exists is that optical element quantity is many, and light loss in the process of transmitting is big like this, requires high to seed light and pumping polarization state of light.
Summary of the invention
It is not high to the system load of injecting the parallel beam combination structure of seed light to the objective of the invention is to overcome parallel beam combination of overlapping coupling and back, the shortcoming that the SBS retroreflectance is lower, overcome the parallel beam combination of standalone media pond SBS the energy stability of light beam is required height, overcome the many problems of optical element quantity simultaneously, proposed a kind of non-colinear serial beam combination apparatus based on stimulated Brillouin scattering.
N of the present invention non-colinear Brillouin structure for amplifying unit and m total reflective mirror are formed, n non-colinear Brillouin structure for amplifying unit is connected in series, n non-colinear Brillouin structure for amplifying unit is divided into k group non-colinear Brillouin structure for amplifying unit group, k group non-colinear Brillouin structure for amplifying unit group is connected in series by m total reflective mirror, each non-colinear Brillouin structure for amplifying unit is made up of medium pond and optical trap, seed light is along being incident in the medium pond with medium pond parallel direction, pumping light is incident to the medium pond from the opposite side in medium pond, angle between pumping light and the seed light is α, the pumping light of remnants in the medium pond after the amplification seed light is incident in the optical trap, entered next stage non-colinear Brillouin structure for amplifying unit by the seed light output after the pumping light amplification in the medium pond, the seed light of the afterbody non-colinear Brillouin structure for amplifying unit output of every group of non-colinear Brillouin structure for amplifying unit group is after two orthogonal total reflective mirrors change light path, enter next group non-colinear Brillouin structure for amplifying unit group, m, k is a natural number, and m 〉=2, k 〉=2, n is a natural number, and n＞1.
Advantage of the present invention is: 1, the load dispersion that a branch of pumping light makes system is injected in a medium pond, can promote the load capacity of beam combination system; 2, can expand bundle on year-on-year basis,, can restraint the adaptive faculty that improve the beam combination system by expanding along with inferior the increasing of beam combination level; 3, less demanding to the energy stability of each light beam of participating in beam combination; 4, reduce the use of a large amount of optical elements, reduced the complicacy of system, reduced system loss; 5, the extraction of the seed light after the injection of pumping light and the amplification all can reach 100%.
Description of drawings
Fig. 1 is a structural representation of the present invention, Fig. 2 is the structural representation of embodiment four, Fig. 3 is the principle schematic of the parallel beam combination of the overlapping coupled structure of SBS in the background technology, Fig. 4 be in the background technology behind the SBS to the principle schematic of injecting the parallel beam combination of seed light structure, Fig. 5 is the principle schematic of the parallel beam combination of SBS standalone media pool structure in the background technology.
Embodiment
The specific embodiment one: present embodiment is described below in conjunction with Fig. 1; Present embodiment is made up of n non-colinear Brillouin amplification construction unit 1; N non-colinear Brillouin amplification construction unit 1 is connected in series; Each non-colinear Brillouin amplification construction unit 1 is made up of medium pool 1-1 and optical trap 1-2; Seed light 3 is along being incident among the medium pool 1-1 with medium pool 1-1 parallel direction; Pumping light 4 is incident to the medium pool 1-1 from the opposite side of medium pool 1-1; Angle between pumping light 4 and the seed light 3 is α
The pumping light 4 of remnants among the 1-1 of medium pond after the amplification seed light 3 is incident among the optical trap 1-2, is entered next stage non-colinear Brillouin structure for amplifying unit 1 by seed light 3 outputs after pumping light 4 amplifications among the 1-1 of medium pond, and n is a natural number, and n＞1.
Principle of work: a branch of seed light 3 successively interacts with pumping light 4 by n non-colinear Brillouin structure for amplifying unit 1.In non-colinear Brillouin structure for amplifying unit 1, seed light 3 interacts in the 1-1 of medium pond with a fixing angle [alpha] with pumping light 4, finishes the amplification of 4 pairs of seed light 3 of pumping light.
Brillouin in the 1-1 of medium pond amplifies, its principle of work is as follows: satisfy the frequency matching condition that Brillouin amplifies between pumping light 4 and the seed light 3, if the frequency of sound wave of the medium in the 1-1 of medium pond is ω 0, pumping light 4 frequencies are ω 1, seed light 3 frequencies are ω 2, then should satisfy relational expression ω 1=ω 2+ ω 0, so when meeting, pumping light 4 and seed light 3 can produce Brillouin's enlarge-effect in the 1-1 of medium pond, finish the amplification of 4 pairs of seed light 3 of pumping light, the energy in the pumping light 4 is shifted to seed light 3.Brillouin amplifies not only can take place under two-beam conllinear situation, and when two-beam has an angle α, and these angle number of degrees α still can take place when not too big.
Embodiment two: the difference of present embodiment and embodiment one also comprises m total reflective mirror 2 at it, n non-colinear Brillouin structure for amplifying unit 1 is divided into k group non-colinear Brillouin structure for amplifying unit group 5, k group non-colinear Brillouin structure for amplifying unit group 5 is connected in series by m total reflective mirror 2
Each non-colinear Brillouin structure for amplifying unit 1 is made up of medium pond 1-1 and optical trap 1-2, seed light 3 is along being incident among the 1-1 of medium pond with medium pond 1-1 parallel direction, pumping light 4 is incident to the 1-1 of medium pond from the opposite side of medium pond 1-1, and the angle between pumping light 4 and the seed light 3 is α
The pumping light 4 of remnants among the 1-1 of medium pond after the amplification seed light 3 is incident among the optical trap 1-2, is entered next stage non-colinear Brillouin structure for amplifying unit 1 by seed light 3 outputs after pumping light 4 amplifications among the 1-1 of medium pond,
The seed light 3 of afterbody non-colinear Brillouin structure for amplifying unit 1 output of every group of non-colinear Brillouin structure for amplifying unit group 5 is after two orthogonal total reflective mirrors 2 change light path, along entering next group non-colinear Brillouin structure for amplifying unit group 5 with medium pond 1-1 parallel direction, m, k is a natural number, and m 〉=2, k 〉=2.
The total reflective mirror 2 of present embodiment is 45 ° with the angle of horizontal direction.
In actual applications, the non-colinear Brillouin structure for amplifying unit 1 that often can not arrange too many on the straight line, actual needs for spatial arrangement, change the optical path direction of non-colinear Brillouin structure for amplifying unit 1 output seed light 3 with total reflective mirror 2, make non-colinear Brillouin structure for amplifying unit 1 laterally, vertically all arrange to some extent, specific practice is that n non-colinear Brillouin structure for amplifying unit 1 is divided into k group non-colinear Brillouin structure for amplifying unit group 5, k group non-colinear Brillouin structure for amplifying unit group 5 is connected in series by m total reflective mirror 2, the seed light 3 of every group of non-colinear Brillouin structure for amplifying unit group 5 outputs reverses 180 ° the seed light 3 of non-colinear Brillouin structure for amplifying unit group 5 outputs through two total reflective mirrors 2, these two total reflective mirrors 2 are orthogonal, and with the angle of surface level be 45 °, seed light 3 edges and the 1-1 parallel direction incident of medium pond of described output, continue to organize with next respectively pumping light 4 effects of each non-colinear Brillouin structure for amplifying unit 1 incident in non-colinear Brillouin structure for amplifying unit group 5, seed light 3 is further amplified, finished the beam combination of n+1 bundle laser at last, the power of seed light 3 is greatly improved.
Embodiment three: present embodiment and the difference of embodiment two are that the quantity of the non-colinear Brillouin structure for amplifying unit 1 of every group of non-colinear Brillouin structure for amplifying unit group 5 equates or are unequal.Other composition is identical with embodiment two with syndeton.
Embodiment four: the difference of present embodiment and embodiment one or embodiment two is that the angle α between pumping light 4 and the seed light 3 is calculated by formula α=arctan (2d/L), the d beam size identical that be seed light 3 wherein with pumping light 4, L is the length of medium pond 1-1; The length L of medium pond 1-1 is calculated by formula L ≈ 25/gI, wherein I be seed light 3 in the 1-1 of medium pond and pumping light 4 the light beam peak power density and, g is the gain coefficient of medium in the 1-1 of medium pond, and other composition and syndeton and embodiment one or embodiment two are identical.
Claims (5)
1. non-colinear serial beam combination apparatus based on stimulated Brillouin scattering, it is characterized in that it is made up of n non-colinear Brillouin structure for amplifying unit (1) and m total reflective mirror (2), n non-colinear Brillouin structure for amplifying unit (1) is connected in series, n non-colinear Brillouin structure for amplifying unit (1) is divided into k group non-colinear Brillouin's structure for amplifying unit group (5), k group non-colinear Brillouin's structure for amplifying unit group (5) is connected in series by m total reflective mirror (2), each non-colinear Brillouin structure for amplifying unit (1) is made up of medium pond (1-1) and optical trap (1-2), seed light (3) is along being incident in the medium pond (1-1) with medium pond (1-1) parallel direction, pumping light (4) is incident to the medium pond (1-1) from the opposite side of medium pond (1-1), angle between pumping light (4) and the seed light (3) is α, the pumping light (4) of remnants in the medium pond (1-1) after the amplification seed light (3) is incident in the optical trap (1-2), entered next stage non-colinear Brillouin structure for amplifying unit (1) by seed light (3) output after pumping light (4) amplification in the medium pond (1-1), the seed light (3) of afterbody non-colinear Brillouin structure for amplifying unit (1) output of every group of non-colinear Brillouin structure for amplifying unit group (5) is after two orthogonal total reflective mirrors (2) change light path, enter next group non-colinear Brillouin's structure for amplifying unit group (5), m, k is a natural number, and m 〉=2, k 〉=2, n is a natural number, and n＞1.
2. a kind of non-colinear serial beam combination apparatus based on stimulated Brillouin scattering according to claim 1 is characterized in that the total reflective mirror (2) and the angle of horizontal direction are 45 °.
3. a kind of non-colinear serial beam combination apparatus based on stimulated Brillouin scattering according to claim 1, the quantity that it is characterized in that the non-colinear Brillouin structure for amplifying unit (1) of every group of non-colinear Brillouin structure for amplifying unit group (5) equates or is unequal.
4. a kind of non-colinear serial beam combination apparatus according to claim 1 based on stimulated Brillouin scattering, it is characterized in that the angle α between pumping light (4) and the seed light (3) is calculated by formula α=arctan (2d/L), wherein d is seed light (3) and the identical beam size of pumping light (4), and L is the length of medium pond (1-1); The length L in medium pond (1-1) is calculated by formula L ≈ 25/gI, wherein I be seed light (3) in the medium pond (1-1) and pumping light (4) the light beam peak power density with, g is the gain coefficient of the interior medium in medium pond (1-1).
5. a kind of non-colinear serial beam combination apparatus based on stimulated Brillouin scattering according to claim 1 is characterized in that pumping light (4) and seed light (3) are all linearly polarized light, circularly polarized light or natural light.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102299476B (en) * | 2011-07-12 | 2012-11-07 | 南昌航空大学 | Time difference pumping stimulated Brillouin scattering device for optical fiber transmission seed laser and method |
| CN103149770B (en) * | 2013-01-18 | 2016-01-06 | 华北电力大学（保定） | For the container of stimulated Brillouin scattering |
| CN103149769B (en) * | 2013-01-18 | 2015-08-19 | 华北电力大学（保定） | Brillouin scattering device |
| CN103149771B (en) * | 2013-01-18 | 2016-03-02 | 华北电力大学（保定） | liquid or gas stimulated Brillouin scattering generation container |
| CN103293820B (en) * | 2013-05-16 | 2016-03-02 | 华北电力大学（保定） | Nonlinear optical effect device |
| CN104269733B (en) * | 2014-10-25 | 2017-02-22 | 哈尔滨工业大学 | Two-dimensional waveguide type medium pond used for amplifying serial laser beam combinations with Brillouin amplifier |
| CN104678559B (en) * | 2015-03-23 | 2017-02-01 | 吕志伟 | Non-collinear serial beam combination method and device based on stimulated Brillouin scattering |
| CN104682188B (en) * | 2015-03-31 | 2017-10-31 | 吕志伟 | Modular non-collinear serial beam combination laser based on stimulated Brillouin scattering |
| CN104882771A (en) * | 2015-06-16 | 2015-09-02 | 吕志伟 | Large-energy high-power SBS beam-combining method and beam-combining laser |
| CN113991407B (en) * | 2021-10-28 | 2023-08-08 | 河北工业大学 | A Brillouin amplification beam combining method and device with controllable output transverse field |
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| WO1992015985A1 (en) * | 1991-02-28 | 1992-09-17 | Battelle Memorial Institute | Laser systems |
| US5910857A (en) * | 1995-02-20 | 1999-06-08 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Laser amplifier |
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