CN102801106B - Multi-chain lath laser coherence control common-aperture polarization synthesis method - Google Patents
Multi-chain lath laser coherence control common-aperture polarization synthesis method Download PDFInfo
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Abstract
The invention relates to a multi-chain lath laser coherence control common-aperture polarization synthesis method. The method is based on a master oscillator power amplifier (MOPA) structure, the wavefront of each path of amplified light beams is purified by a unit beam purification system, and a coherence control common-aperture polarization synthesis technology is utilized to solve the problem that coherence synthesis energy is dispersed to side spots in the prior art, thereby realizing laser output with high mean brightness and common aperture. The multi-chain lath laser coherence control common-aperture polarization synthesis method comprises a unit beam purification technology, a phase-locked technology and a common aperture polarization control technology. A synthesis path can be expanded to multiple paths.
Description
Technical field
The present invention relates to High-power Laser Technologies field, particularly the relevant aperture polarized combination method altogether of controlling of multichain slab laser.
Background technology
Along with the fast development of semiconductor laser technique and the significantly lifting of semiconductor laser device performance, all solid state laser has been obtained significant development, and derives the laser of the different structures such as pole laser, slab laser, thin-sheet laser, fiber laser, capacitance laser.Owing to being subject to the restriction of the factors such as stability, thermal effect, laser medium self character, separate unit all solid state laser is difficult to obtain the Laser output of hundred kilowatts.It is a kind of effective ways that solve above-mentioned bottleneck that multichannel mid power laser is concerned with synthetic.Researcher's theory analysis of Northrop Grumman company of the U.S. shows, fiber laser and slab laser can be realized hundred kilowatts of high power laser lights outputs with heat management comparatively easily.2009, the researcher of the said firm, using optical-fiber laser as seed source, utilized active phase control to realize 7 tunnel myriawatt level slab lasers relevant synthetic, and power output reaches 105.5kW.This is the high average output power of all-solid state laser up to now, has the meaning of milestone in High-power Laser Technologies field.But traditional relevant synthetic schemes, mostly based on aperture splicing technology, causes far field energy to disperse to other spot, has reduced beam quality and the encircled energy of synthetic light beam.Take the Northrop Grumman 105.5kW of company synthetic schemes as example, along with the increase of synthetic way, it is fewer and feweri that power in synthetic light beam main lobe accounts for the ratio of gross power, 105.5kW laser main lobe power only accounts for 11% of gross power, brightness the indifference of its brightness and a 12kW single mode fiber laser.The brightness how further to improve synthetic light beam is the problem that researcher explores always.Utilize relevant synthetic technology and aperture filling technique, the laser of Jiang Ge road mid power synthesizes beam of laser output simultaneously, is one of all solid state laser feasible way of realizing high power and high light beam quality.The technological difficulties of utilizing relevant synthetic technology to realize hundred kilowatts are the improvement of single channel power ascension, way expansion, beam quality.The power output of slab laser is more than Da Wanwa level, and its output beam characteristic meets relevant synthetic needs, therefore caused domestic and international researcher's extensive concern.But the output beam of slab laser has its weak point at present, is mainly reflected in: (1), due to the impact of the factors such as thermal effect, the beam quality of single slab laser awaits further improvement; (2) synthetic light beam does not carry out aperture filling, and synthetic hot spot exists certain duty ratio near field, cause far field energy to disperse to other spot, and therefore the beam quality of synthetic rear light beam needs further to promote.Based on the consideration of above-mentioned factor, comprehensive unit beam cleanup technology of the present invention, design a kind ofly based on multilink Slab Laser amplifier, utilized the relevant aperture polarized combination technology altogether of controlling, realized high mean flow rate, the innovative techniques scheme of aperture Laser output altogether.
Summary of the invention
The present invention is based on master oscillation power amplification structure (MOPA), range site beam cleanup system purifies the wavefront that amplifies Hou Ge road light beam, utilize the relevant aperture polarized combination technology altogether of controlling, the problem of avoiding the synthetic energy of traditional coherent to disperse to other spot, realizes high mean flow rate, is total to aperture Laser output.
Technical solution of the present invention is:
Whole system comprises: seed source 1, pre-amplification module 2, beam splitter array 3, phase-modulator 4, one-level amplification module 5, spacer array 6, lath amplifier module 7, unit light beam cleaning module 8, synthesis module 9, synthetic rear beam cleanup module 10, synthetic beam treatment module 11, photodetection module 12, signal processing module 13.
Implementation procedure of the present invention is as follows:
The light that export in laser seed source 1 amplifies by pre-amplification module 2, then enters and is divided into N bundle after beam splitter array 3; Enter one-level amplification module 5 from beam splitter array 3 light out through phase-modulator 4; Each road light beam is amplified into spacer array 6 through one-level amplification module 5, injects subsequently lath amplifier module 7; Lath amplifier module 7 Dui Ge road light beams carry out multistage amplification, make each road luminous power reach necessary requirement; Enter unit Beam Wave-Front cleaning module 8 from lath amplifier module 7 light beam out and proofread and correct the wavefront distortion that each road laser beam causes due to factors such as thermal effects; Dui Mei road light beam purify laggard enter light beam synthesis module 9 synthesize beam of laser output by participating in synthetic light beam.Light beam after synthetic carries out through beam cleanup module 10 wavefront distortion that double purification causes with Tc, synthesis module etc.; Synthetic light beam is through purifying the synthetic beam treatment module 11 of laggard mistake, for surveying the power, hot spot distribution, beam quality etc. of output light; Very fraction light changes light signal into signal of telecommunication entering signal processing module 13 through photodetection module 12; The input signal that signal processing module 13 provides photodetection module 12 is processed, and phase control signal is transported to phase-modulator 4 phase place of each road light beam is modulated, and realizes the closed-loop control of whole system.The phase difference of photodetection module 12, signal processing module 13 and phase-modulator 4 comprehensive function Dui Ge road light beams is controlled, and makes whole system realize high efficiency stable output.
This method comprises unit light beam purification techniques, Phase Lock Technique, is total to aperture polarization control technology;
This method amplifier section adopts slab laser, and prime is put in advance with one-level amplifier section and adopted fiber laser; Initiatively phase control method can be single dithering or SPGD method; The synthetic way of this method can be extended to multichannel.
Described laser seed source 1 is a narrow linewidth laser, can be fiber laser or solid state laser; Described pre-amplification module 2 amplifies seed source light beam, and amplifier used is fiber amplifier; The light beam that described beam splitter array 3 is exported pre-amplification module 2 is divided into N bundle, and beam splitter used is fiber optic splitter; Phase difference between the phase modulated signal Dui Ge road light beam that described phase-modulator module 4 applies according to signal processing module 13 is controlled, and phase-modulator used can be LiNbO
3or piezoelectric ceramic phase; Spacer array 6 is the isolating devices such as faraday rotator, prevents that light echo from breaking prime device; Lath amplifier module 7 Dui Ge road light beams amplify, and its inside is multistage structure for amplifying, and can comprise beam shaping system; Light can be that single amplifies in lath amplifier, can be also repeatedly repeatedly to amplify; Seed source 1 in the above system configuration, pre-amplification module 2, beam splitter array 3, phase-modulator 4, one-level amplification module 5, spacer array 6, lath amplifier module 7 all have polarization and keep function.
Unit light beam cleaning module 8 purifies amplifying Hou Ge road light beam, proofreaies and correct the wavefront distortion causing due to heat etc.; Its implementation is identical with traditional method; Its specific implementation has multiple, such as SPGD method, simulated annealing etc.; Synthesis module 9 utilizes the relevant light beam of controlling after polarized combination principle Jiang Ge road, aperture purification altogether to synthesize a branch of; 10 is beam cleanup module after synthetic, for the light beam after synthetic is carried out to wavefront optimization; After 10, synthetic after light beam enter synthetic beam treatment module 11 for surveying the power, hot spot distributions, beam quality etc. of synthetic light beam, little part light enters photodetection module 12; Photodetection module 12 changes the light intensity signal after synthetic into voltage signal; The voltage signal that signal processing module 13 provides photodetection module 12 is through changing the control signal of phase-modulator module 4 into after processing; In hundred kilowatts of strong laser systems of Northrop Grumman company, the signal processing algorithm of its use is many ditherings, in our design, the optimized algorithms such as use single-frequency dithering, SPGD method is carried out to phase-locked control.In the present invention program, synthesis module 9 and signal processing module 13 are core contents of protection.
The present invention comprises following technique effect:
1, the invention provides a kind of method that realizes high power, high stability, high light beam quality Laser output; The method comprises three core technologies: unit light beam purification techniques, Phase Lock Technique, common aperture polarization control technology;
2, main amplifier section provided by the invention adopts slab laser, and prime is put in advance with one-level amplifier section and adopted fiber laser;
3, initiatively phase control method can be single dithering, SPGD method etc.;
4, the synthetic way of this method can be extended to multichannel.
Accompanying drawing explanation
Fig. 1 is system configuration principle schematic of the present invention,
The relevant aperture polarized combination schematic diagram altogether of controlling of Tu2Wei eight road lath amplifiers,
Fig. 3 is beam splitting inside modules structural representation in Fig. 2.
Embodiment:
In Fig. 1, the 1st, seed source, 2 is pre-amplification module, the 3rd, beam splitter array, the 4th, phase-modulator, the 5th, one-level amplification module, the 6th, spacer array, the 7th, lath amplifier module, the 8th, unit light beam cleaning module, the 9th, synthesis module, the 10th, synthetic rear beam cleanup module, the 11st, synthetic beam treatment module, the 12nd, photodetection module, the 13rd, signal processing module.
In Fig. 2, the 1st, seed source, 2 is pre-amplification module, the 3rd, beam splitter array, the 4th, phase-modulator, the 5th, one-level amplification module, the 6th, spacer array, the 71st, total reflective mirror I, the 72nd, lath amplifier array, the 81st, beam splitting module I, the 82nd, survey and control module, 83 is distorting lens I, the 91st, total reflective mirror II, the 92nd, half-wave plate, the 93rd, polarization beam combiner, the 101st, beam splitting module II, 102 is total reflective mirror III, 103 is beam splitting module III, 104 is acquisition of signal and processing module, 105 is distorting lens II, 111 is splitter module IV, 112 is total reflective mirror IV, 113 is power meter, 114 is hot spot analyzer, 12 is photodetector, 13 is signal processing module.
In Fig. 3, the 71st, total reflective mirror, the 73rd, high reflective mirror.
It is the implementation procedure that example illustrates whole scheme that this method Yi Ba road slab laser is realized the process of hundred kilowatts, and whole system can expand to multichannel.The light that export in laser seed source 1 amplifies by the pre-amplification module 2 of fiber amplifier, is divided into 8 bundles after then entering 1:8 beam splitter array 3; Enter one-level optic fiber amplifying module 5 from beam splitter array 3 light out through phase-modulator 4; Each road light beam is amplified into spacer array 6 through one-level amplification module 5, injects subsequently lath amplifier array 72; In lath amplifier, containing beam shaping parts, is rectangular light beam by the Gauss beam reshaping of incident; Lath amplifier array 72Dui Ge road light beam carries out multistage amplification; Enter and get to above distorting lens 83 through total reflective mirror I 71 from lath amplifier array 72 light beam out, then enter beam splitting module I 81; Beam splitting module I is transmitted to wavefront signals by sub-fraction light and surveys processing module 82, and wavefront signals is surveyed processing module 82 and controlled the wavefront distortion that distorting lens I 83 causes due to factors such as thermal effects for proofreading and correct each road laser beam; Most of reverberation by beam splitting module I 81 enters polarization beam combiner 93.Wherein 91 is that total reflective mirror II, 92 is half-wave plate.Generally, if there is no association between the phase place between two bunch polarised lights, the phase place of the light beam after they are rotated on polarization beam combiner 93 when synthetic by half-wave plate 92, are synthetic is indefinite, and therefore, the light beam after synthetic is random elliptically polarized light.This elliptically polarized light is when by next stage polarization beam combiner, and portion of energy will be lost, and makes the expansion of whole system limited.If the phase difference that participates in synthetic two-way orthogonal polarized light beam can be locked as to n π (n is integer), the light beam after synthesizing is linearly polarized light, linearly polarized light after synthetic regulates polarization state by half-wave plate, can restraint the vertical linearly polarized light in polarization direction with another again and synthesize, thus synthetic output the in common aperture of realizing multichannel light beam.Known by above analysis, synthesis module can be restrainted eight of incident photosynthetic a branch of output that becomes.Not having when phase-locked, have portion of energy and reveal; After phase-locked system is set up and implemented, whole system is in closed loop state, and Jiang Ba road light beam utilization altogether aperture Polarization Control synthesizes beam of laser output.Light beam after synthetic is after beam splitting module II 101, and most of light is injected into above distorting lens II 105 after total reflective mirror III 102, and very fraction light changes light signal into signal of telecommunication entering signal processing module 13 through photodetection module 12; Through the light beam of distorting lens II 105 by beam splitting module III 103 after, sub-fraction light feeds back to acquisition of signal and processing module 104 for controlling distorting lens II 105, most of light enters synthetic beam treatment module 11.Synthetic major part light beam is injected into power meter 113 by splitter module IV 111, and seldom part light enters hot spot analyzer 114 through total reflective mirror IV 112 and observes hot spot distribution and beam quality; The input signal that signal processing module 13 provides photodetection module 12 is processed, and phase control signal is transported to phase-modulation module 4, and the phase place of each road light beam is modulated, and realizes the closed-loop control of whole system.The phase difference of photodetection module 12, signal processing module 13 and phase-modulation module 4 comprehensive function Dui Ge road light beams is controlled, and makes whole system realize high efficiency stable output.
Claims (6)
1. the relevant aperture polarized combination method altogether of controlling of multichain slab laser, is characterized in that, described method realizes in the following manner:
The light of laser seed source (1) output amplifies by pre-amplification module (2), then enters to be divided into N after beam splitter array (3) and to restraint;
Enter one-level amplification module (5) from beam splitter array (3) light out through phase-modulator (4);
Each road light beam is amplified into spacer array (6) through one-level amplification module (5), injects subsequently lath amplifier module (7);
Lath amplifier module (7) Dui Ge road light beam carries out multistage amplification, makes each road luminous power reach necessary requirement;
Enter unit Beam Wave-Front cleaning module (8) from lath amplifier module (7) light beam out; Described unit Beam Wave-Front cleaning module (8) is by beam splitting module
(81), wavefront signals is surveyed processing module (82) and distorting lens (83) composition; Get to above distorting lens (83) from lath amplifier module (7) light beam out, then enter beam splitting module
(81); Beam splitting module
(81) sub-fraction light is transmitted to wavefront signals and surveys processing module (82), wavefront signals is surveyed processing module (82) and is controlled the wavefront distortion that distorting lens (83) causes due to thermal effect for proofreading and correct each road laser beam;
Enter light beam synthesis module (9) through purifying Hou Mei road light beam; Light beam synthesis module (9) utilizes the relevant aperture polarized combination principle altogether of controlling to synthesize beam of laser output by participating in synthetic light beam; Described light beam synthesis module (9) is made up of polarization beam combiner (93), total reflective mirror II (91) and half-wave plate (92);
Light beam after synthetic carries out double purification with Tc, the caused wavefront distortion of synthesis module through beam cleanup module (10);
Synthetic light beam is after purifying, and major part enters synthetic beam treatment module (11), and for surveying, power, the hot spot of output light distributes, beam quality; Very fraction changes light signal into signal of telecommunication entering signal processing module (13) through photodetection module (12);
The input signal that signal processing module (13) provides photodetection module (12) is processed, and phase control signal is transported to phase-modulator (4) phase place of each road light beam is modulated, and realizes the closed-loop control of whole system; The phase difference of photodetection module (12), signal processing module (13) and phase-modulator (4) comprehensive function Dui Ge road light beam is controlled, and makes whole system realize high efficiency stable output;
Phase difference between the phase modulated signal Dui Ge road light beam that described phase-modulator (4) applies according to signal processing module (13) is controlled, and phase-modulator used is LiNbO
3or piezoelectric ceramic phase; Described spacer array (6) is faraday rotator isolating device, prevents that light echo from breaking prime device; Described lath amplifier module (7) Dui Ge road light beam amplifies, and its inside is multistage structure for amplifying, comprises beam shaping system; Light can amplify or repeatedly repeatedly amplify by single in lath amplifier;
Described laser seed source (1), pre-amplification module (2), beam splitter array (3), phase-modulator (4), one-level amplification module (5), spacer array (6), lath amplifier module (7) all have polarization and keep function.
2. the relevant aperture polarized combination method altogether of controlling of multichain slab laser according to claim 1, is characterized in that: described pre-amplification module (2) amplifies seed source light beam, and amplifier used is fiber amplifier.
3. the relevant aperture polarized combination method altogether of controlling of multichain slab laser according to claim 1, is characterized in that: described beam splitter array (3) is divided into N bundle the light beam of pre-amplification module (2) output, and beam splitter used is fiber optic splitter.
4. the relevant aperture polarized combination method altogether of controlling of multichain slab laser according to claim 1, is characterized in that: synthetic way is multichannel.
5. the relevant aperture polarized combination method altogether of controlling of multichain slab laser according to claim 1, is characterized in that: described laser seed source (1) is a narrow linewidth laser.
6. the relevant aperture polarized combination method altogether of controlling of multichain slab laser according to claim 5, is characterized in that: described narrow linewidth laser is fiber laser or solid state laser.
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| CN103033944A (en) * | 2012-12-04 | 2013-04-10 | 广东汉唐量子光电科技有限公司 | Polarization beam-combination device for pulsed laser |
| CN103199434B (en) * | 2013-03-04 | 2015-09-09 | 中国科学院长春光学精密机械与物理研究所 | A kind of method realizing semiconductor laser coherent polarization synthesis |
| CN103219651A (en) * | 2013-03-04 | 2013-07-24 | 中国科学院长春光学精密机械与物理研究所 | Semiconductor laser light source based on coherent polarization synthetic technology |
| CN109818247B (en) * | 2019-01-30 | 2020-01-24 | 中国人民解放军国防科技大学 | Coherent combination phase control method and system for laser array |
| CN109713555B (en) * | 2019-03-14 | 2020-07-03 | 中国科学院理化技术研究所 | Common-aperture lath amplification laser incoherent synthesis device |
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