CN104678559A - Non-collineation serial beam grouping method and device based on excited brillouin scattering - Google Patents
Non-collineation serial beam grouping method and device based on excited brillouin scattering Download PDFInfo
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- CN104678559A CN104678559A CN201510128334.1A CN201510128334A CN104678559A CN 104678559 A CN104678559 A CN 104678559A CN 201510128334 A CN201510128334 A CN 201510128334A CN 104678559 A CN104678559 A CN 104678559A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000003321 amplification Effects 0.000 claims abstract description 74
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 74
- 238000005086 pumping Methods 0.000 claims abstract description 39
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 230000009022 nonlinear effect Effects 0.000 abstract description 8
- 230000015556 catabolic process Effects 0.000 abstract description 5
- 230000004927 fusion Effects 0.000 abstract description 3
- 230000005693 optoelectronics Effects 0.000 abstract 1
- 238000001069 Raman spectroscopy Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a non-collineation serial beam grouping method and device based on excited brillouin scattering, relates to a serial beam grouping technique of laser, and aims to solve the problem that in serial beam grouping, a plurality of light beams cannot be further grouped when amplification light energy density reaches a generation threshold of a nonlinear effect such as excited brillouin scattering of a medium or exceeds a breakdown threshold of the medium. Seed light is fed to be in front of each medium pond, beams are firstly amplified through a cylindrical lens beam amplification system, and the outgoing end of a final medium pond is provided with a cylindrical lens beam shrinkage system for shrinking the beams, so that the problems that nonlinear effects such as excited brillouin scattering are generated and the medium has a breakdown threshold can be avoided; in addition, the structure is simple, the amplification efficiency is improved, the energy stability requirements of pumping light are low, different loading capabilities can be obtained by using the cylindrical lens beam amplification system with different beam amplification ratios, the shapes of outgoing light spots are identical to those of light before being fed, and the method and the device are applicable to fields such as inertial confinement fusion, impact intensification, optoelectronic countermeasure, laser radar and optical parametric oscillator pumping.
Description
Technical field
The present invention relates to the serial group bundle technology of laser, belong to optical field.
Background technology
There is macro-energy, repetition frequency, high light beam quality solid state laser have a wide range of applications in fields such as inertial confinement fusion, shock peening, photoelectronic warfare, laser radar and optical parametric oscillator pumpings.Along with the lifting of repetition frequency and energy, the simple laser system relying on master oscillation power amplification structure, by being limited by the technical barriers such as the size of gain media, heat affecting and damage threshold, causes the stability of laser system and beam quality to be guaranteed.Meanwhile, because the duty of every one-level amplifying unit all impacts to the performance exporting light, therefore the increase along with amplifying unit is also deteriorated by stability.
Set up the effective ways of the laser system of macro-energy exactly by some Shu Guang are carried out beam combination, namely by carrying out little for multi beam energy laser to synthesize the technological means realizing macro-energy, high power laser light output.Stimulated Brillouin scattering (SBS) non-colinear serial group bundle based on nonlinear optics phase conjugation principle has that structure is simple, pump absorption efficiency is high, output beam quality good, be easy to the advantages such as through engineering approaches application, is subject to the extensive concern of domestic and international researchist.Although compared with parallel beam combination, serial group bundle structure has higher load capacity.But the medium due to beam combination has certain breakdown threshold, and along with injecting the raising of peak power density, easily producing the nonlinear effects such as stimulated Raman scattering, all limiting the raising of combining efficiency.Therefore along with the raising of amplified energy, how to improve the load capacity of device further extremely important.
Summary of the invention
The object of the invention is in order to solve some Shu Guang carry out serial group bundle time, amplify optical energy density reach the generation threshold value of the nonlinear effects such as the stimulated Raman scattering of medium or exceed the breakdown threshold of medium and the problem of beam combination cannot be realized further, a kind of non-colinear serial group bundle method based on stimulated Brillouin scattering and device are provided.
Non-colinear serial group bundle method based on stimulated Brillouin scattering of the present invention is: arrange cylindrical lens beam-expanding system in the seed light incidence end of each non-colinear Brillouin amplification structural unit, seed light is after cylindrical lens beam-expanding system expands, enter described non-colinear Brillouin amplification structural unit, multiple non-colinear Brillouin amplification structural unit is connected in series.
In the end the seed light exit end of one-level non-colinear Brillouin amplification structural unit arranges cylindrical lens contracting beam system, seed light through afterbody non-colinear Brillouin amplification structural unit amplify after, through the outgoing of cylindrical lens contracting beam system.
Non-colinear serial beam combination apparatus based on stimulated Brillouin scattering of the present invention comprises n non-colinear Brillouin amplification structural unit, n is natural number, and n>1, n non-colinear Brillouin amplification structural unit is connected in series, each non-colinear Brillouin amplification structural unit comprises cylindrical lens beam-expanding system, medium pool and optical trap, seed light is after cylindrical lens beam-expanding system expands, length direction along medium pool is incident in medium pool, pumping light is from an incident sideways to medium pool of medium pool and amplify seed light, remaining pumping light is incident to optical trap through after medium pool, seed light is crossing in medium pool with pumping light, after medium pool outgoing, next stage non-colinear Brillouin amplification structural unit is entered by the seed light after pumping light amplification in medium pool.
The seed light exit end of afterbody non-colinear Brillouin amplification structural unit is provided with cylindrical lens contracting beam system, and seed light, after afterbody non-colinear Brillouin amplification structural unit amplifies, exports after cylindrical lens contracting beam system contracting bundle.
Described non-colinear serial beam combination apparatus also comprises 2 (k-1) individual seed light total reflective mirror, n non-colinear Brillouin amplification structural unit is divided into k group non-colinear Brillouin amplification structural unit group, k be greater than 1 integer, enter after two seed light total reflective mirrors reflections successively from the seed light often organizing last non-colinear Brillouin amplification structural unit outgoing non-colinear Brillouin amplification structural unit group and organize non-colinear Brillouin amplification structural unit group.
Non-colinear serial group bundle method based on stimulated Brillouin scattering of the present invention and device can improve the load capacity of beam combination device, avoid the nonlinear effects such as generation stimulated Raman scattering and medium to puncture the problem of threshold.Structure is simple, only needs to expand seed light, improves the effect volume of seed light and pumping light, improves amplification efficiency.Pumping light is without the need to carrying out shaping and not affecting the homogeneity of amplifying luminous energy.Require low to the energy stability of the pumping light participating in beam combination.According to actual needs, adopt the different cylinder beam-expanding system expanding ratio, different loads ability can be obtained.And after some grades of beam combinations, still can keep exporting the light spot shape amplifying light identical with before incidence.The present invention is applicable to the fields such as inertial confinement fusion, shock peening, photoelectronic warfare, laser radar and optical parametric oscillator pumping.
Accompanying drawing explanation
Fig. 1 is the structural representation of the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in embodiment three;
Fig. 2 is the structural representation of the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in embodiment five;
Fig. 3 is the beam Propagation schematic diagram of plano-concave cylindrical lens in embodiment ten;
Fig. 4 is the beam Propagation schematic diagram of piano convex cylindrical lens in embodiment ten;
Fig. 5 is the beam Propagation schematic diagram of embodiment ten central column face the beams extended by lens system and cylindrical lens contracting beam system, restraints in the direction of the arrow for expanding, along the opposite direction of arrow for contracting.
Embodiment
Embodiment one: composition graphs 1 illustrates present embodiment, the non-colinear serial group bundle method based on stimulated Brillouin scattering described in present embodiment is: arrange cylindrical lens beam-expanding system 1-1 in the seed light incidence end of each non-colinear Brillouin amplification structural unit 1, seed light 2 is after cylindrical lens beam-expanding system 1-1 expands, enter described non-colinear Brillouin amplification structural unit 1, multiple non-colinear Brillouin amplification structural unit 1 is connected in series.
In said method, before seed light 2 incides each medium pool 1-2, first expand through cylindrical lens beam-expanding system 1-1, the method can improve the load capacity of beam combination device, avoids the nonlinear effects such as generation stimulated Raman scattering and medium to puncture the problem of threshold.
Embodiment two: composition graphs 1 illustrates present embodiment, present embodiment is the further restriction to the non-colinear serial group bundle method based on stimulated Brillouin scattering described in embodiment one, in present embodiment, in the end the seed light exit end of one-level non-colinear Brillouin amplification structural unit 1 arranges cylindrical lens contracting beam system 4, seed light 2 through afterbody non-colinear Brillouin amplification structural unit 1 amplify after, through the outgoing of cylindrical lens contracting beam system 4.
Cylindrical lens contracting beam system 4 is for being shaped as the shape before amplification by seed light 2.After some grades of beam combinations, still can keep exporting the light spot shape amplifying light identical with before incidence.
Embodiment three: composition graphs 1 illustrates present embodiment, the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in present embodiment comprises n non-colinear Brillouin amplification structural unit 1, n is natural number, and n>1, n non-colinear Brillouin amplification structural unit 1 is connected in series, each non-colinear Brillouin amplification structural unit 1 comprises cylindrical lens beam-expanding system 1-1, medium pool 1-2 and optical trap 1-3, seed light 2 is after cylindrical lens beam-expanding system 1-1 expands, length direction along medium pool 1-2 is incident in medium pool 1-2, pumping light 3 amplifies seed light 2 to medium pool 1-2 from the incident sideways of medium pool 1-2, remaining pumping light 3 is incident to optical trap 1-3 through after medium pool 1-2, seed light 2 is crossing in medium pool 1-2 with pumping light 3, seed light 2 after being amplified by pumping light 3 in medium pool 1-2 enters next stage non-colinear Brillouin amplification structural unit 1 after medium pool 1-2 outgoing.
In present embodiment, before seed light 2 incides each medium pool 1-2, first expand through cylindrical lens beam-expanding system 1-1.The non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in present embodiment can improve the load capacity of beam combination device, avoids the nonlinear effects such as generation stimulated Raman scattering and medium to puncture the problem of threshold.Structure is simple, only needs to expand seed light 2, improves the effect volume of seed light and pumping light, improves amplification efficiency.Pumping light 3 is without the need to carrying out shaping and not affecting the homogeneity of amplifying luminous energy.Require low to the energy stability of the pumping light participating in beam combination.According to actual needs, adopt the different cylinder beam-expanding system expanding ratio, different loads ability can be obtained.
Embodiment four: composition graphs 1 illustrates present embodiment, present embodiment is the further restriction to the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in embodiment three, in present embodiment, the seed light exit end of afterbody non-colinear Brillouin amplification structural unit 1 is provided with cylindrical lens contracting beam system 4, seed light 2, after afterbody non-colinear Brillouin amplification structural unit 1 amplifies, exports after cylindrical lens contracting beam system 4 contracting bundle.
In present embodiment, cylindrical lens contracting beam system 4 is for being shaped as the shape before amplification by seed light 2.After some grades of beam combinations, still can keep exporting the light spot shape amplifying light identical with before incidence.
Embodiment five: composition graphs 2 illustrates present embodiment, present embodiment is the further restriction to the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in embodiment three or four, in present embodiment, described non-colinear serial beam combination apparatus also comprises 2 (k-1) individual seed light total reflective mirror 5, n non-colinear Brillouin amplification structural unit 1 is divided into k group non-colinear Brillouin amplification structural unit group, k be greater than 1 integer, enter after two seed light total reflective mirrors 5 reflect successively from the seed light 2 often organizing last non-colinear Brillouin amplification structural unit 1 outgoing non-colinear Brillouin amplification structural unit group and organize non-colinear Brillouin amplification structural unit group.
Embodiment six: composition graphs 1 and Fig. 2 illustrate present embodiment, present embodiment is the further restriction to the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in embodiment three or four, in present embodiment, in every one-level non-colinear Brillouin amplification structural unit 1, the quantity of pumping light 3 is j, j is natural number, and j >=1, angle between seed light 2 with every a branch of pumping light 3 can be equal or not etc., the scope of described angle is 0 ° to 90 °, the quantity of optical trap 1-3 is identical with pumping light 3, often restraint the corresponding optical trap 1-3 of pumping light 3.
Beam diameter before seed light 2 and pumping light 3 are incident to described non-colinear serial beam combination apparatus is D, and beam cross section area is
the ratio that expands of the cylindrical lens beam-expanding system 1-1 in i-th grade of non-colinear Brillouin amplification structural unit 1 is K
i, after n non-colinear Brillouin amplification structural unit 1 amplifies, seed light 2 is exaggerated along the same axis
doubly, now after n non-colinear Brillouin amplification structural unit 1, the beam cross section area of seed light 2 becomes
the contracting beam ratio example of cylindrical lens contracting beam system 4 equals
For n-th grade of non-colinear Brillouin amplification structural unit 1, the peak power before seed light 2 incidence is P
sn, then the peak power density D before this seed light 2 incidence
snfor
The peak power being incident to the m bundle pumping light 3 of i-th non-colinear Brillouin amplification structural unit 1 is P
pim, the peak power of every a branch of pumping light 3 can be equal or not etc., then described m does not restraint the peak power density D of pumping light 3
pimfor
namely in i-th non-colinear Brillouin amplification structural unit 1, the peak power density of every a branch of pumping light 3 is respectively D
pi1, D
pi2... D
pij.
In medium pool 1-2, the generation threshold value of the nonlinear effect such as stimulated Raman scattering of medium is T
1, the breakdown threshold of medium is T
2, be incident to the peak power density D of the seed light 2 of i-th grade of non-colinear Brillouin amplification structural unit 1
si<T
1and D
si<T
2, m restraints the peak power density D of pumping light 3
pim<T
1and D
pim<T
2, the seed light 2 after n-th grade of non-colinear Brillouin amplification structural unit 1 amplifies and the power density sum of pumping light 3
Embodiment seven: present embodiment is the further restriction to the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in embodiment five, in present embodiment, for each seed light total reflective mirror 5, the incident angle of seed light is 45 °.
Embodiment eight: present embodiment is the further restriction to the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in embodiment five, in present embodiment, the quantity often organizing the non-colinear Brillouin amplification structural unit 1 of non-colinear Brillouin amplification structural unit group is equal or unequal.
Embodiment nine: present embodiment is the further restriction to the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in embodiment five, in present embodiment, seed light 2 and pumping light 3 are linearly polarized light, circularly polarized light or natural light.
Embodiment ten: composition graphs 3 to Fig. 5 illustrates present embodiment, present embodiment is the further restriction to the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering described in embodiment four, in present embodiment, described cylindrical lens beam-expanding system 1-1 and cylindrical lens contracting beam system 4 are formed by piano convex cylindrical lens and plano-concave cylindrical lens.
Claims (10)
1. based on the non-colinear serial group bundle method of stimulated Brillouin scattering, it is characterized in that: in the seed light incidence end of each non-colinear Brillouin amplification structural unit (1), cylindrical lens beam-expanding system (1-1) is set, seed light (2) is after cylindrical lens beam-expanding system (1-1) expands, enter described non-colinear Brillouin amplification structural unit (1), multiple non-colinear Brillouin amplification structural unit (1) is connected in series.
2. the non-colinear serial group bundle method based on stimulated Brillouin scattering according to claim 1, it is characterized in that: in the end the seed light exit end of one-level non-colinear Brillouin amplification structural unit (1) arranges cylindrical lens contracting beam system (4), seed light (2) through afterbody non-colinear Brillouin amplification structural unit (1) amplify after, through cylindrical lens contracting beam system (4) outgoing.
3. based on the non-colinear serial beam combination apparatus of stimulated Brillouin scattering, it is characterized in that: it comprises n non-colinear Brillouin amplification structural unit (1), n is natural number, and n>1, n non-colinear Brillouin amplification structural unit (1) is connected in series, each non-colinear Brillouin amplification structural unit (1) comprises cylindrical lens beam-expanding system (1-1), medium pool (1-2) and optical trap (1-3), seed light (2) is after cylindrical lens beam-expanding system (1-1) expands, length direction along medium pool (1-2) is incident in medium pool (1-2), pumping light (3) from an incident sideways of medium pool (1-2) to medium pool (1-2) and seed light (2) is amplified, remaining pumping light (3) is incident to optical trap (1-3) through after medium pool (1-2), seed light (2) is crossing in medium pool (1-2) with pumping light (3), after medium pool (1-2) outgoing, next stage non-colinear Brillouin amplification structural unit (1) is entered by the seed light (2) after pumping light (3) amplification in medium pool (1-2).
4. the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering according to claim 3, it is characterized in that: the seed light exit end of afterbody non-colinear Brillouin amplification structural unit (1) is provided with cylindrical lens contracting beam system (4), seed light (2), after afterbody non-colinear Brillouin amplification structural unit (1) amplifies, exports after cylindrical lens contracting beam system (4) contracting bundle.
5. the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering according to claim 3, it is characterized in that: described non-colinear serial beam combination apparatus also comprises 2 (k-1) individual seed light total reflective mirror (5), n non-colinear Brillouin amplification structural unit (1) is divided into k group non-colinear Brillouin amplification structural unit group, k be greater than 1 integer, enter after two seed light total reflective mirror (5) reflections successively from the seed light (2) often organizing last non-colinear Brillouin amplification structural unit (1) outgoing non-colinear Brillouin amplification structural unit group and organize non-colinear Brillouin amplification structural unit group.
6. the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering according to claim 3 or 4, it is characterized in that: in every one-level non-colinear Brillouin amplification structural unit (1), the quantity of pumping light (3) is j, j is natural number, and j >=1, angle between seed light (2) with every a branch of pumping light (3) can be equal or not etc., the scope of described angle is 0 ° to 90 °, the quantity of optical trap (1-3) is identical with pumping light (3), often restraints the corresponding optical trap (1-3) of pumping light (3).
7. the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering according to claim 5, is characterized in that: for each seed light total reflective mirror (5), and the incident angle of seed light is 45 °.
8. the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering according to claim 5, is characterized in that: the quantity often organizing the non-colinear Brillouin amplification structural unit (1) of non-colinear Brillouin amplification structural unit group is equal or unequal.
9. the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering according to claim 5, is characterized in that: seed light (2) and pumping light (3) are linearly polarized light, circularly polarized light or natural light.
10. the non-colinear serial beam combination apparatus based on stimulated Brillouin scattering according to claim 4, is characterized in that: described cylindrical lens beam-expanding system (1-1) and cylindrical lens contracting beam system (4) are formed by piano convex cylindrical lens and plano-concave cylindrical lens.
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| CN104882771A (en) * | 2015-06-16 | 2015-09-02 | 吕志伟 | Large-energy high-power SBS beam-combining method and beam-combining laser |
| CN113991407A (en) * | 2021-10-28 | 2022-01-28 | 河北工业大学 | Brillouin amplification beam combination method and device with controllable output transverse field |
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