CN104267558A - Stimulated Brillouin scattering based non-collinear double-pass amplification method and non-collinear double-pass beam combination device - Google Patents
Stimulated Brillouin scattering based non-collinear double-pass amplification method and non-collinear double-pass beam combination device Download PDFInfo
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- CN104267558A CN104267558A CN201410577933.7A CN201410577933A CN104267558A CN 104267558 A CN104267558 A CN 104267558A CN 201410577933 A CN201410577933 A CN 201410577933A CN 104267558 A CN104267558 A CN 104267558A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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Abstract
The invention provides a stimulated Brillouin scattering based non-collinear double-pass amplification method and non-collinear double-pass beam combination device and relates to a serial beam combination technology of the brillouin amplification laser. The stimulated Brillouin scattering based non-collinear double-pass amplification method and non-collinear double-pass beam combination device aims at solving the problem that the existing stimulated Brillouin scattering based non-collinear serial beam combination device is low in amplification efficiency. One side of a medium pool is provided with a pumping light total reflection mirror and the pumping light enters the medium pool through oblique incidence, is reflected by the pumping light total reflection mirror after penetrating the medium pool and enters the medium pool again. Twice amplification is performed on the seed light through the pumping light totally and accordingly the utilization rate of the pumping light is improved and the amplification efficiency is improved by more than 50% in comparison with a non-collinear one-way amplification method. The incident angle of the pumping light can be adjusted, the effect angle and the overlapped area size of the seed light and the pumping light can be changed, and accordingly the adjustable amplification efficiency is implemented. The distance between the medium pool and the pumping light total reflection mirror is adjusted to enable the time delay of the second pulse action of the seed light and the pumping light to be adjusted. The stimulated Brillouin scattering based non-collinear double-pass amplification method and non-collinear double-pass beam combination device is suitable for a large power and high power solid laser.
Description
Technical field
The present invention relates to a kind of serial group bundle device of Brillouin amplification laser, belong to optical field.
Background technology
Macro-energy and high power solid state laser have a wide range of applications in fields such as inertial confinement fusion, laser guidance, photoelectronic warfare, space optical communications.The energy of simple dependence master oscillator power amplifier (MOPA) obtains from the single active medium of available maximum volume, therefore the restriction of crystalline material volume, thermal effect and damage threshold is subject to, and amplified energy and beam quality are limited by the duty of every one-level amplifying unit, system robustness is poor.
Laser beam combination is divided into coherent beam combination and noncoherent decoying two class, is a kind of by synthesizing to the little energy of multi beam, low power laser the technological means realizing macro-energy, high power laser light output.The existing stimulated Brillouin scattering based on nonlinear optics phase conjugation principle (SBS) beam combination mode mainly comprises serial group bundle and parallel beam combination two kinds.Compare with parallel beam combination, serial structure makes the load relative distribution of beam combination system, particularly has higher load capacity when light beam is more, amplifies light simultaneously and has higher pump absorption efficiency and beam quality.Serial group bundle is divided into conllinear and non-colinear two kinds of structures, compared with conllinear serial group bundle, non-colinear serial group bundle component number relative simplicity, structure are simple, are more suitable for engineering structure, but pumping light and seed light only act on once, cause that pumping light utilization efficiency is low, amplification efficiency is low.
Summary of the invention
The object of the invention is to solve the existing problem low based on the non-colinear serial beam combination apparatus amplification efficiency of stimulated Brillouin scattering, a kind of non-colinear MOPA system method based on stimulated Brillouin scattering and non-colinear round trip beam combination device are provided.
Non-colinear MOPA system method based on stimulated Brillouin scattering of the present invention is: arrange pumping light total reflective mirror in the side of medium pool, pumping light enters medium pool from the side relative with pumping light total reflective mirror, reflected by pumping light total reflective mirror through after medium pool, again enter medium pool, the angle α of pumping light and seed light meets arctan ((4d+2s)/L)≤α < pi/2, the beam size of seed light is identical with the beam size of pumping light, be d, L is the length of medium pool, s is the upper surface of medium pool and the distance of pumping light total reflective mirror, s >=0.
L ≈ 25/gI, wherein, I be seed light in medium pool and pumping light light beam peak power density and, g is the gain coefficient of medium in medium pool.
Non-colinear round trip beam combination device based on stimulated Brillouin scattering of the present invention comprises the identical non-colinear round trip Brillouin amplification structural unit of n structure, n is natural number, and n>1, n non-colinear round trip Brillouin amplification structural unit is connected in series, each non-colinear round trip Brillouin amplification structural unit comprises medium pool, optical trap and pumping light total reflective mirror, the upper surface of medium pool is parallel with pumping light total reflective mirror, seed light is incident in medium pool along the length direction of medium pool, pumping light is incident to medium pool from the side of medium pool, and be incident to pumping light total reflective mirror through medium pool, again medium pool is entered by after the reflection of pumping light total reflective mirror, and again through medium pool, then optical trap is entered, exported by the seed light after pumping light amplification in medium pool and enter next stage non-colinear round trip Brillouin amplification structural unit, angle between seed light and pumping light is α, and arctan ((4d+2s)/L)≤α < pi/2, the beam size of seed light is identical with the beam size of pumping light, be d, L is the length of medium pool, s is the upper surface of medium pool and the distance of pumping light total reflective mirror, s >=0.
The above-mentioned non-colinear round trip beam combination device based on stimulated Brillouin scattering also comprises 2 (k-1) individual seed light total reflective mirror, n non-colinear round trip Brillouin amplification structural unit is divided into k group, k be greater than 1 integer, organize the seed light of last non-colinear round trip Brillouin amplification structural unit outgoing successively after two seed light total reflective mirror reflections from each, enter and organize non-colinear round trip Brillouin amplification structural unit.
Non-colinear MOPA system method based on stimulated Brillouin scattering of the present invention and non-colinear round trip beam combination device, the oblique incidence of pumping light enters medium pool, interact with seed light, seed light is amplified, then, remaining pumping light passes medium pool, and by after the reflection of pumping light total reflective mirror, again enter medium pool, and second time amplification is carried out to seed light.In whole process, pumping light has carried out twice amplification altogether to seed light, improves the utilization factor of pumping light, and then improves amplification efficiency, and compared with non-colinear one way amplification method, amplification efficiency at least improves 50%.The incident angle of pumping light can be regulated, change effect angle and the overlapping region volume of seed light and pumping light, realize amplification efficiency adjustable.By regulating the distance of medium pool and pumping light total reflective mirror, make the time delay of seed light and the pulse action of pumping light second time adjustable.In addition, less demanding to the energy stability of each light beam participating in beam combination.A medium pool injects a branch of seed light, the load of system is disperseed, can promote the load capacity of beam combination system.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the non-colinear MOPA system method based on stimulated Brillouin scattering described in embodiment one, is also the structural representation of the non-colinear round trip beam combination device based on stimulated Brillouin scattering described in embodiment three simultaneously;
Fig. 2 is the structural representation of the non-colinear round trip beam combination device based on stimulated Brillouin scattering described in embodiment seven.
Embodiment
Embodiment one: composition graphs 1 illustrates present embodiment, the non-colinear MOPA system method based on stimulated Brillouin scattering described in present embodiment is: arrange pumping light total reflective mirror 1-2 in the side of medium pool 1-1, pumping light 3 enters medium pool 1-1 from the side relative with pumping light total reflective mirror 1-2, reflected by pumping light total reflective mirror 1-2 through after medium pool 1-1, again enter medium pool 1-1, pumping light 3 meets arctan ((4d+2s)/L)≤α < pi/2 with the angle α of seed light 2, the beam size of seed light 2 is identical with the beam size of pumping light 3, be d, L is the length of medium pool 1-1, s is the upper surface of medium pool 1-1 and the distance of pumping light total reflective mirror 1-2, s >=0.
As shown in Figure 1, pumping light 3 oblique incidence enters medium pool 1-1, interacts with seed light 2, amplify seed light 2, then, remaining pumping light 3 is through medium pool 1-1, and after being reflected by pumping light total reflective mirror 1-2, again enter medium pool 1-1, and second time amplification is carried out to seed light 2.In whole process, pumping light 3 pairs of seed light 2 have carried out twice amplification altogether, improve the utilization factor of pumping light 3, and then improve amplification efficiency, and compared with non-colinear one way amplification method, amplification efficiency improves more than 50%.
Embodiment two: present embodiment is the further restriction to the non-colinear MOPA system method based on stimulated Brillouin scattering described in embodiment one, in present embodiment, L ≈ 25/gI, wherein, I be seed light in medium pool 1-1 2 with the light beam peak power density of pumping light 3 and, g is the gain coefficient of medium in medium pool 1-1.
Embodiment three: composition graphs 1 illustrates present embodiment, the non-colinear round trip beam combination device based on stimulated Brillouin scattering described in present embodiment comprises the identical non-colinear round trip Brillouin amplification structural unit 1 of n structure, n is natural number, and n>1, n non-colinear round trip Brillouin amplification structural unit 1 is connected in series, each non-colinear round trip Brillouin amplification structural unit 1 comprises medium pool 1-1, optical trap 1-3 and pumping light total reflective mirror 1-2, the upper surface of medium pool 1-1 is parallel with pumping light total reflective mirror 1-2, seed light 2 is incident in medium pool 1-1 along the length direction of medium pool 1-1, pumping light 3 is incident to medium pool 1-1 from the side of medium pool 1-1, and be incident to pumping light total reflective mirror 1-2 through medium pool 1-1, medium pool 1-1 is again entered after being reflected by pumping light total reflective mirror 1-2, and again through medium pool 1-1, then optical trap 1-3 is entered, seed light 2 after being amplified by pumping light 3 in medium pool 1-1 exports and enters next stage non-colinear round trip Brillouin amplification structural unit 1, angle between seed light 2 and pumping light 3 is α, and arctan ((4d+2s)/L)≤α < pi/2, the beam size of seed light 2 is identical with the beam size of pumping light 3, be d, L is the length of medium pool 1-1, s is the upper surface of medium pool 1-1 and the distance of pumping light total reflective mirror 1-2, s >=0.
In present embodiment, n non-colinear round trip Brillouin amplification structural unit 1 is arranged in order along the direction of propagation of seed light 2.For each non-colinear round trip Brillouin amplification structural unit 1, pumping light total reflective mirror 1-2 is provided with in the side of medium pool 1-1, the direction of propagation of seed light 2 is parallel with length direction with medium pool 1-1, pumping light 3 meets with seed light 2 after entering medium pool 1-1 with the direction oblique incidence of seed light 2 in α angle, and seed light 2 is amplified, remaining pumping light 3 continues to propagate along former direction, until through medium pool 1-1, and reflected by pumping light total reflective mirror 1-2, the angle that pumping light 3 and pumping light total reflective mirror 1-2 reflect is β=arccos (n
2cos α/n
1), wherein n
1for air refraction, n
2for the refractive index of medium in medium pool 1-1, n
1<n
2.Pumping light 3 after reflection enters medium pool 1-1 again, and again meets with seed light 2, carries out second time amplify seed light 2, and then remaining pumping light 3 continues to propagate, and through medium pool 1-1, enters optical trap 1-3.Seed light 2 after twice amplification from medium pool 1-1 outgoing, and enters the medium pool 1-1 of a next non-colinear round trip Brillouin amplification structural unit 1 as seed light 2.
Angle between pumping light 3 and seed light 2 is α, changes effect angle and the overlapping region volume of pumping light 3 and seed light 2, can realize amplification efficiency adjustable.For ensureing that the pumping light 3 after by pumping light total reflective mirror 1-2 reflection can enter medium pool 1-1 again, and seed light 2 is fully amplified, the length of α and medium pool 1-1 need meet arctan ((4d+2s)/L)≤α < pi/2.
In present embodiment, pumping light 3 pairs of seed light 2 carry out twice amplification, altogether compared with the non-colinear amplifying technique of routine, the utilization factor of pumping light 3 is improved significantly, and then amplification efficiency is also improved significantly, experiment proves, amplification efficiency can improve more than 50%.
Embodiment four: present embodiment is the further restriction to the non-colinear round trip beam combination device based on stimulated Brillouin scattering described in embodiment three, in present embodiment, L ≈ 25/gI, wherein, I be seed light in medium pool 1-1 2 with the light beam peak power density of pumping light 3 and, g is the gain coefficient of medium in medium pool 1-1.
The length L ≈ 25/gI of medium pool 1-1, can ensure that pumping light 3 and seed light 2 fully act on.
Pumping light 3 is pulsed light, by the upper surface of adjustment medium pool 1-1 and the distance s of pumping light total reflective mirror 1-2, makes seed light 2 adjustable with the time delay of pumping light 3 second time pulse action.
Embodiment five: present embodiment is the further restriction to the non-colinear round trip beam combination device based on stimulated Brillouin scattering described in embodiment three, in present embodiment, seed light 2 and pumping light 3 are all linearly polarized light, circularly polarized light or natural light.
Embodiment six: composition graphs 2 illustrates present embodiment, present embodiment is the further restriction to the non-colinear round trip beam combination device based on stimulated Brillouin scattering described in embodiment three to five, in present embodiment, the described non-colinear round trip beam combination device based on stimulated Brillouin scattering also comprises 2 (k-1) individual seed light total reflective mirror 4, n non-colinear round trip Brillouin amplification structural unit 1 is divided into k group, k be greater than 1 integer, enter after two seed light total reflective mirrors 4 reflect successively from the seed light 2 often organizing last non-colinear round trip Brillouin amplification structural unit 1 outgoing and organize non-colinear round trip Brillouin amplification structural unit 1.
N non-colinear round trip Brillouin amplification structural unit 1 divides into groups by present embodiment, and often in group, the quantity of non-colinear round trip Brillouin amplification structural unit 1 can be equal, also can not wait.Reflect seed light 2 by two seed light total reflective mirrors 4 between two adjacent groups, this structure substantially reduces the length of device, makes apparatus structure compacter.
As shown in Figure 2, generally seed light total reflective mirror 4 being arranged to incident angle is 45 ± 5 °, and seed light 2 is after two seed light total reflective mirrors 4 reflect, and the direction of propagation changes 180 degree, and in whole device, the direction of propagation of seed light 2 is " bow " font.
Claims (6)
1. based on the non-colinear MOPA system method of stimulated Brillouin scattering, it is characterized in that: in the side of medium pool (1-1), pumping light total reflective mirror (1-2) is set, pumping light (3) enters medium pool (1-1) from the side relative with pumping light total reflective mirror (1-2), reflected by pumping light total reflective mirror (1-2) through after medium pool (1-1), again enter medium pool (1-1), pumping light (3) meets arctan ((4d+2s)/L)≤α < pi/2 with the angle α of seed light (2), the beam size of seed light (2) is identical with the beam size of pumping light (3), be d, L is the length of medium pool (1-1), s is the upper surface of medium pool (1-1) and the distance of pumping light total reflective mirror (1-2), s >=0.
2. the non-colinear MOPA system method based on stimulated Brillouin scattering according to claim 1, it is characterized in that: L ≈ 25/gI, wherein, I be seed light (2) in medium pool (1-1) with the light beam peak power density of pumping light (3) and, g is the gain coefficient of medium pool (1-1) interior medium.
3. based on the non-colinear round trip beam combination device of stimulated Brillouin scattering, comprise non-colinear round trip Brillouin amplification structural unit (1) that n structure is identical, n is natural number, and n>1, n non-colinear round trip Brillouin amplification structural unit (1) is connected in series, each non-colinear round trip Brillouin amplification structural unit (1) comprises medium pool (1-1) and optical trap (1-3), it is characterized in that: each non-colinear round trip Brillouin amplification structural unit (1) also comprises pumping light total reflective mirror (1-2), the upper surface of medium pool (1-1) is parallel with pumping light total reflective mirror (1-2), seed light (2) is incident in medium pool (1-1) along the length direction of medium pool (1-1), pumping light (3) is incident to medium pool (1-1) from the side of medium pool (1-1), and be incident to pumping light total reflective mirror (1-2) through medium pool (1-1), medium pool (1-1) is again entered by after pumping light total reflective mirror (1-2) reflection, and again through medium pool (1-1), then optical trap (1-3) is entered, seed light (2) output after being amplified by pumping light (3) in medium pool (1-1) enters next stage non-colinear round trip Brillouin amplification structural unit (1), angle between seed light (2) and pumping light (3) is α, and arctan ((4d+2s)/L)≤α < pi/2, the beam size of seed light (2) is identical with the beam size of pumping light (3), be d, L is the length of medium pool (1-1), s is the upper surface of medium pool (1-1) and the distance of pumping light total reflective mirror (1-2), s >=0.
4. the non-colinear round trip beam combination device based on stimulated Brillouin scattering according to claim 3, it is characterized in that: L ≈ 25/gI, wherein, I be seed light (2) in medium pool (1-1) with the light beam peak power density of pumping light (3) and, g is the gain coefficient of medium pool (1-1) interior medium.
5. the non-colinear round trip beam combination device based on stimulated Brillouin scattering according to claim 3, is characterized in that: seed light (2) and pumping light (3) are all linearly polarized light, circularly polarized light or natural light.
6. the non-colinear round trip beam combination device based on stimulated Brillouin scattering according to claim 3,4 or 5, it is characterized in that: it also comprises 2 (k-1) individual seed light total reflective mirror (4), n non-colinear round trip Brillouin amplification structural unit (1) is divided into k group, k be greater than 1 integer, enter after two seed light total reflective mirrors (4) reflections successively from the seed light (2) often organizing last non-colinear round trip Brillouin amplification structural unit (1) outgoing and organize non-colinear round trip Brillouin amplification structural unit (1).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682188A (en) * | 2015-03-31 | 2015-06-03 | 吕志伟 | Stimulated brillouin scattering-based modularized non-collinear serial beam combination laser device |
| CN105529612A (en) * | 2015-11-13 | 2016-04-27 | 华北电力大学（保定） | Cross stimulated scattering enhancement device and method |
-
2014
- 2014-10-24 CN CN201410577933.7A patent/CN104267558A/en active Pending
Non-Patent Citations (1)
| Title |
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| 王双义: "基于布里渊放大的激光串行组束中若干关键问题研究", 《中国博士学位论文全文数据库基础科学辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682188A (en) * | 2015-03-31 | 2015-06-03 | 吕志伟 | Stimulated brillouin scattering-based modularized non-collinear serial beam combination laser device |
| CN104682188B (en) * | 2015-03-31 | 2017-10-31 | 吕志伟 | Modularization non-colinear serial group bundle laser based on stimulated Brillouin scattering |
| CN105529612A (en) * | 2015-11-13 | 2016-04-27 | 华北电力大学（保定） | Cross stimulated scattering enhancement device and method |
| CN105529612B (en) * | 2015-11-13 | 2020-09-04 | 华北电力大学（保定） | Cross stimulated scattering enhancement device and method |
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