CN202749679U - Multi-chain slat laser coherent control common aperture polarization synthesis device - Google Patents
Multi-chain slat laser coherent control common aperture polarization synthesis device Download PDFInfo
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- CN202749679U CN202749679U CN 201220374633 CN201220374633U CN202749679U CN 202749679 U CN202749679 U CN 202749679U CN 201220374633 CN201220374633 CN 201220374633 CN 201220374633 U CN201220374633 U CN 201220374633U CN 202749679 U CN202749679 U CN 202749679U
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Abstract
The utility model relates to a multi-chain slat laser coherent control common aperture polarization synthesis device consists of a seed source (1), a preset module (2), a beam splitter array (3), a phase modulator (4), a level one amplification module (5), an isolator array (6), a slat amplification module (7), a unit beam purification module (8), a synthesis module (9), a post-synthesized beam purification module (10) and a synthesis beam processing module (11) which are connected in sequence. A signal processing module (13) is connected with the corresponding phase modulator (4). A photoelectric detection module (12) is connected with the synthesized beam purification module (10) and the signal processing module (13). Adopting the coherent control common aperture polarization synthesis technology, the multi-chain slat laser coherent control common aperture polarization synthesis device is capable of avoiding the problem in the prior art that energy is dispersed to the side, achieving high average brightness and common aperture laser output. The multi-chain slat laser coherent control common aperture polarization synthesis device adopts a unit beam purification technology, a phase lock technology and a coherent control common aperture polarization control technology. A synthetic channel can be expanded into a plurality of channels.
Description
Technical field
The present invention relates to the High-power Laser Technologies field, particularly the relevant control of multichain slab laser is total to aperture polarized combination method.
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 subjected to the restriction of the factors such as stability, thermal effect, laser medium self character, the separate unit all solid state laser is difficult to obtain hundred kilowatts Laser output.Being concerned with multichannel mid power laser synthetic is a kind of effective ways that solve above-mentioned bottleneck.Researcher's theory analysis of U.S. Northrop Grumman company 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 as seed source, utilized the active phase control to realize that 7 tunnel myriawatt level lath lasers are relevant synthetic with optical-fiber laser, 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 the High-power Laser Technologies field.But traditional relevant synthetic schemes causes the far field energy to disperse to other spot mostly based on the aperture splicing technology, has reduced beam quality and the encircled energy of synthetic light beam.Take the Northrop Grumman 105.5kW of company synthetic schemes as example, increase along with synthetic way, it is fewer and feweri that power in the 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 and 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 the researcher explores always.Utilizing simultaneously relevant synthetic technology and aperture filling technique, each road Medium power density laser is synthesized beam of laser output, is one of feasible way of all solid state laser realization high power and high light beam quality.Utilize relevant synthetic technology to realize that hundred kilowatts technological difficulties are the improvement of single channel power ascension, way expansion, beam quality.The power output of slab laser is more than the Da Wanwa level, and its output beam characteristic satisfies 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) owing 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 the aperture filling, and there is certain duty ratio in synthetic hot spot in the near field, cause the far field energy to disperse to other spot, and the beam quality of light beam need to further promote after therefore synthesizing.Consideration based on above-mentioned factor, comprehensive unit beam cleanup technology of the present invention, designed a kind ofly based on multilink Slab Laser amplifier, utilized altogether aperture polarized combination technology of relevant control, 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 of each road light beam after amplifying, utilize altogether aperture polarized combination technology of relevant control, avoid the synthetic energy of traditional coherent to the problem that other spot disperses, realize high mean flow rate, be total to the aperture Laser output.
Technical solution of the present invention is:
Whole device 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, beam cleanup module 10 after synthetic, synthetic beam treatment module 11, photodetection module 12, signal processing module 13, wherein, 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, beam cleanup module 10 after synthetic, synthetic beam treatment module 11 is linked in sequence, signal processing module 13 connects phase-modulator 4, photodetection module 12 connects synthetic rear beam cleanup module 10, and signal processing module 13 is connected with photodetection module 12.
Implementation procedure of the present invention is as follows:
The light of laser seed source 1 output amplifies by pre-amplification module 2, is divided into the N bundle after then entering 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; 7 pairs of each road light beams of lath amplifier module carry out multistage amplification, so that each road luminous power reaches necessary requirement; Enter unit Beam Wave-Front cleaning module 8 from lath amplifier module 7 light beam out and proofread and correct each road laser beam because the wavefront distortion that the factors such as thermal effect cause; Every road light beam is purified laggardly to enter light beam synthesis module 9 and will participate in synthetic light beam and synthesize beam of laser output.Light beam after synthetic carries out the wavefront distortion that double purification causes with Tc, synthesis module etc. through beam cleanup module 10; Synthetic light beam is through purifying the synthetic beam treatment module 11 of laggard mistake, for the power of surveying output light, hot spot distribution, beam quality etc.; Very fraction light changes light signal into signal of telecommunication entering signal processing module 13 through photodetection module 12; The input signal that 13 pairs of photodetection modules 12 of signal processing module provide is processed, and phase control signal is transported to phase-modulation module 4 phase place of each road light beam is modulated, and realizes the closed-loop control of whole system.Photodetection module 12, signal processing module 13 and 4 comprehensive functions of phase-modulation module are controlled the phase difference of each road light beam, so that whole system realizes high efficiency stable output.
This method comprises unit light beam purification techniques, Phase Lock Technique, is total to the aperture polarization control technology;
This method amplifier section adopts slab laser, and prime is put in advance with the 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; 2 pairs of seed source light beams of described pre-amplification module amplify, and used amplifier is fiber amplifier; Described beam splitter array 3 is divided into the N bundle to the light beam of pre-amplification module 2 outputs, and used beam splitter is fiber optic splitter; Described phase-modulator module 4 is controlled the phase difference between each road light beam according to the phase modulated signal that signal processing module 13 applies, and used phase-modulator can be LiNbO
3Or piezoelectric ceramic phase; Spacer array 6 is the isolating devices such as faraday rotator, prevents that light echo from breaking the prime device; 7 pairs of each road light beams of lath amplifier module amplify, and its inside is multistage structure for amplifying, and can comprise the beam shaping system; Light can be that single amplifies in the lath amplifier, also can be 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.
Each road light beam after 8 pairs of amplifications of unit light beam cleaning module purifies, the wavefront distortion that proofread and correct because heat etc. causes; Its implementation is identical with traditional method; Its specific implementation has multiple, such as SPGD method, simulated annealing etc.; The light beam that synthesis module 9 utilizes relevant control to be total to after aperture polarized combination principle purifies each road synthesizes a branch of; 10 are beam cleanup module after synthetic, are used for the light beam after synthetic is carried out wavefront optimization; After 10, synthetic rear light beam enters synthetic beam treatment module 11 for the power of surveying synthetic light beam, hot spot distribution, beam quality etc., and seldom part light enters photodetection module 12; Light intensity signal after photodetection module 12 will be synthesized changes voltage signal into; The voltage signal that signal processing module 13 provides photodetection module 12 changes the control signal of phase-modulator module 4 afterwards into through processing; In hundred kilowatts of strong laser systems of Northrop Grumman company, the signal processing algorithm of its use is many ditherings, will use the optimized algorithms such as single-frequency dithering, SPGD method to carry out phase-locked control in our design.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 the 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.
Description of drawings
Fig. 1 is system configuration principle schematic of the present invention,
Fig. 2 is altogether aperture polarized combination schematic diagram of the relevant control of eight road lath amplifiers,
Fig. 3 is beam splitting inside modules structural representation among Fig. 2.
Embodiment:
Among 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.
Among Fig. 2, the 1st, seed source, 2 is pre-amplification module, the 3rd, the beam splitter array, the 4th, the phase-modulator module, the 5th, the one-level amplification module, the 6th, spacer array, the 71st, the total reflective mirror I, the 72nd, the lath amplifier array, the 81st, beam splitting module I, the 82nd, survey and control module, 83 is the distorting lens I, the 91st, the total reflective mirror II, the 92nd, half-wave plate, the 93rd, polarization beam combiner, the 101st, beam splitting module II, 102 is the total reflective mirror III, 103 are beam splitting module III, 104 is acquisition of signal and processing module, 105 is the distorting lens II, 111 is the splitter module IV, 112 is the total reflective mirror IV, 113 is power meter, 114 is the hot spot analyzer, 12 is photodetector, 13 is signal processing module.
Among Fig. 3, the 71st, total reflective mirror, the 73rd, high reflective mirror.
This method realizes that take No. eight slab lasers hundred kilowatts process illustrates the implementation procedure of whole scheme as example, and whole system can expand to multichannel.The light of laser seed source 1 output 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; Containing the beam shaping parts in the lath amplifier, is rectangular light beam with the Gauss beam reshaping of incident; 72 pairs of each road light beams of lath amplifier array carry out multistage amplification; Enter through total reflective mirror I 71 from lath amplifier array 72 light beam out and to get to above the distorting lens 83, then enter beam splitting module I 81; Beam splitting module I is transmitted to wavefront signals with sub-fraction light and surveys processing module 82, and wavefront signals is surveyed processing module 82 control distorting lens I 83 and is used for proofreading and correct each road laser beam because the wavefront distortion that the factors such as thermal effect cause; 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 speaking, if do not have association between the phase place between the two bunch polarised lights, the phase place of the light beam after they are rotated on the 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 by the next stage polarization beam combiner time, and portion of energy will be lost, so that the expansion of whole system is limited.If the phase difference that participates in synthetic two-way orthogonal polarized light beam can be locked as n π (n is integer), light beam after namely synthesizing is linearly polarized light, linearly polarized light after synthetic is regulated 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 the multichannel light beam.By above analysis as can be known, synthesis module can be restrainted photosynthetic a branch of output that becomes with eight of incident.Do not having when phase-locked, having portion of energy and reveal; After phase-locked system was set up and implemented, whole system was in the closed loop state, eight road light beam utilizations is total to the aperture Polarization Control synthesizes beam of laser output.After the light beam process beam splitting module II 101 after synthetic, be injected into above the distorting lens II 105 after most of light process total reflective mirror III 102, 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 is used for controlling distorting lens II 105 with processing module 104, most of light enters and synthesizes beam treatment module 11.Splitter module IV 111 is injected into power meter 113 with the synthetic light beam of major part, 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 13 pairs of photodetection modules 12 of signal processing module provide 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.Photodetection module 12, signal processing module 13 and 4 comprehensive functions of phase-modulation module are controlled the phase difference of each road light beam, so that whole system realizes high efficiency stable output.
Claims (4)
1. the relevant control of multichain slab laser is total to the aperture polarization synthesizing device, comprise: the pre-amplification module (2) of seed source (1), 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), beam cleanup module (10) after synthetic, synthetic beam treatment module (11), photodetection module (12), signal processing module (13), it is characterized in that, 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), beam cleanup module (10) after synthetic, synthetic beam treatment module (11) is linked in sequence, signal processing module (13) connects phase-modulator (4), photodetection module (12) connects synthetic rear beam cleanup module (10), and signal processing module (13) is connected with photodetection module (12).
2. the relevant control of multichain slab laser according to claim 1 is total to the aperture polarization synthesizing device, it is characterized in that, described laser seed source (1) is a narrow linewidth laser.
3. the relevant control of multichain slab laser according to claim 1 is total to the aperture polarization synthesizing device, it is characterized in that, described pre-amplification module (2) amplifies the seed source light beam, and used amplifier is fiber amplifier.
4. the relevant control of multichain slab laser according to claim 1 is total to the aperture polarization synthesizing device, it is characterized in that, described beam splitter array (3) is divided into the N bundle to the light beam of pre-amplification module (2) output, and used beam splitter is fiber optic splitter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199434A (en) * | 2013-03-04 | 2013-07-10 | 中国科学院长春光学精密机械与物理研究所 | Method achieving 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199434A (en) * | 2013-03-04 | 2013-07-10 | 中国科学院长春光学精密机械与物理研究所 | Method achieving 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 |
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