CN105790061A - Dual-injection OPCPA coherent beam combination ultra-high power laser system - Google Patents
Dual-injection OPCPA coherent beam combination ultra-high power laser system Download PDFInfo
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- CN105790061A CN105790061A CN201410829187.6A CN201410829187A CN105790061A CN 105790061 A CN105790061 A CN 105790061A CN 201410829187 A CN201410829187 A CN 201410829187A CN 105790061 A CN105790061 A CN 105790061A
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Abstract
Disclosed is a dual-injection OPCPA coherent beam combination ultra-high power laser system. The system combines a coherent beam combination method with a dual-injection OPCPA hybrid type ultra-high power femtosecond laser system; and a level of dozens of PW or even EW-level ultra-high power laser output is realized finally. Based on the advantages of single-pass high gain heating effect prevention, and the like of the OPCPA, the ultra-high power laser system enables different light beams to pass through the same light path, so that the influence from phase change uncertainty in the OPCPA amplification is greatly lowered, the difficulty in controlling synchronism of different light beams is lowered, the coherent beam combination effect of the ultra-high power laser system can be improved, and laser output with higher energy levels can be realized.
Description
Technical field
The present invention relates to fs-laser system, particularly a kind of Dual Implantations OPCPA coherent beam combination ultra high power laser system.
Background technology
In recent decades, ultrashort and ultrahigh laser device development, its peak power reaches bat watt (1015W) magnitude, Focus Peaks power can reach 1021W/cm2-1023W/cm2.Ultrashort and ultrahigh laser device is that numerous ambit provides unprecedented laboratory facilities and extreme physical condition, the experiment of superpower field laser target interaction is used widely, for instance ultrafast X-ray radiation, the generation of higher hamonic wave, the acceleration of laser coronal region particle and fast ignition laser fusion etc..Testing for most superpower fields laser target interaction, what play a decisive role is the peak power density at laser focusing back focus place.Therefore the peak power density how improving laser instrument is the research focus in high power laser light field.
But it is subject to the restriction of the work bore of the Primary Component such as laser medium and Compressed grating, the traditional method improving single beam laser energy difficulty that utilizes meets the requirement that energy density is greatly improved, and therefore multiple laser coherent superposition is the following effective way improving peak power density.Peak power increase substantially (> 1025W/cm2) will based on quantrm electrodynamics theoretical and experimental verification condition is provided, for instance, the generation etc. of electron-positron pair in vacuum polarization effect, vacuum.Coherent beam superimposing technique is by raising (> 10 further for peak power25W/cm2) more feasible method is provided.Existing CPA-OPCPA or full OPCPA ultra high power laser system are combined with Coherent Beam Combination and is undoubtedly the effective ways increasing substantially laser power.Traditional coherently combined method be by beam splitting after pulse amplify compression (through different amplification process and compressor) respectively, it is focused again closing bundle, but the beam quality of single beam and the synchronicity of light interfascicular are required high by coherently combined method, and traditional coherent is closed bundle method and the Laser beam quality control of ultra high power laser system is brought high difficulty.
Such as coherent beam combination test (see Fig. 4) of the little energy OPCPA laser system that Russia's laser physics realizes, obtaining optics coherence tomography pulse the shortest up to now, output energy is 50 μ J, and pulse width is 49fs, frequency is 10Hz, and combined coefficient is 97%.Its experimental technique is that femtosecond oscillator 1 ' is produced 75MHz pulse, through stretcher 2 ' broadening, AOPDF3 ' precompensation and electrooptic modulator 4 ' frequency-selecting, is divided into two-beam through beam splitter 5 '.First light beam amplifies through nonlinear crystal 6 ', enters condenser lens 11 ' then through compressor 7 ' after compressing；Second light beam amplifies through nonlinear crystal 9 ', enters condenser lens 11 ' after compressor 10 ' compresses.The time delay of two-way light interfascicular is regulated, by regulating the dispersion difference that dispersion compensation device 12 ' null grating difference causes so that two bundle laser focus on generation coherent superposition in focus simultaneously by time controlled system 8 '.13 ' measure system for dual-beam time jitter, the time error signal recorded is passed to delay adjustment device 8 ' time delay is adjusted.But owing to this experimental technique adopts two nonlinear crystals amplifications, two compressor compresses, introduce bigger light interfascicular poor optical properties different, adding the coherently combined difficulty of ultra high power low-repetition-frequency PW laser system, the difference how reducing light interfascicular becomes the key technology of ultra high power femtosecond laser coherent superposition.
Summary of the invention
The purpose of the present invention is to propose to a kind of Dual Implantations OPCPA coherent beam combination ultra high power laser system.This system proposes laser amplifier and the compression method of Dual Implantations formula, defines Dual Implantations formula coherent beam combination pattern.This system make use of OPCPA gain by one path height and without advantages such as heat effects, make different light beam through same optical path, greatly reduce phase place during OPCPA amplifies change probabilistic impact and control the difficulty of different light interfascicular synchronicitys, the coherently combined effect of ultra high power laser system can be improved, it is achieved higher energy laser exports.
The technical solution of the present invention is as follows:
nullA kind of Dual Implantations formula OPCPA coherent beam combination ultra high power laser system，It is characterized in that this system includes high s/n ratio front end、Stretcher、Front end amplifier chain、Beam splitter、First reflecting mirror、Second reflecting mirror、3rd reflecting mirror、4th reflecting mirror、5th reflecting mirror、6th reflecting mirror、7th reflecting mirror、8th reflecting mirror、First chronotron、Second chronotron、OPCPA terminal amplifier、Compressor、PZT delay adjustment device、First spectroscope、Second spectroscope、Time delay measurement device、PID closed loop delay controller、Focusing system and OPCPA high energy pumping source，Laser pulse seed light is through described high s/n ratio front end、Stretcher、After the amplifier chain of front end，Flashlight and flashlight it is divided into through beam splitter，It flashlight light path is successively the first described chronotron、Second reflecting mirror、OPCPA terminal amplifier、5th reflecting mirror、Compressor、PZT delay adjustment device、First spectroscope and focusing system，After converge at focus；It described flashlight light path is successively the first described reflecting mirror, second chronotron, 3rd reflecting mirror, OPCPA terminal amplifier, 4th reflecting mirror, compressor, 6th reflecting mirror, second spectroscope and focusing system, after converge at focus, it is described Time delay measurement device and PID closed loop delay controller in the spectroscopical light splitting direction of the first described spectroscope and second, the outfan of described PID closed loop delay controller is connected with the control end of described PZT delay adjustment device, described OPCPA terminal amplifier is carried out pumping through the 7th described reflecting mirror by the pump light of described OPCPA high energy pumping source output.
Described front end amplifier chain is OPCPA amplifier chain or CPA amplifier chain.
The first described flashlight and secondary signal light share same pump light, and the first flashlight, secondary signal light all meet nonlinear angle matching condition with pump light, and pump light pulsewidth regulates according to the light beam pulsewidth injected and interval.By regulating the first chronotron and the second chronotron, regulate the first flashlight and the time delay of secondary signal light so that it is be completely contained in pump light.Described beam splitting light can continue beam splitting and obtain four bundle light or more multi-beam, and light beam co-implanted same nonlinear crystal and same compressor between two, forms OPCPA Dual Implantations formula multiple beam coherent beam combination system.
The present invention has following technical effect that
Dual Implantations coherent beam combination ultra high power fs-laser system of the present invention, with CPA or OPCPA amplifier chain be front-end amplifier stage, Dual Implantations formula OPCPA amplifier is for terminal amplifier stage, light pulse after front-end amplifier stage amplifies is divided into two bundles, two-beam amplifies through same OPCPA amplifier, same compressor compresses, focuses on then through condenser lens and realizes coherent superposition in same point.This system overcomes the nonlinear crystal bore restriction to amplified energy in single beam OPCPA amplification process, take full advantage of again high-gain in OPCPA amplification process, advantage without heat effect, decrease and close the difference of light interfascicular in bundle process, greatly reduce conjunction bundle difficulty.Native system monochromatic light road can realize the output-index of original ultra high power laser system, coherent beam combination structure in addition, it is possible to achieve the significantly lifting of peak power.Whole system has compact conformation, the advantage that stability is high, it is possible to be applied to the key areas with important scientific meaning and strategy high technology innovation.
Technical scheme is applicable to different operating wave band, need only select different operating medium as required.
Technical scheme is applicable not only to the coherent superposition of dual-beam, it is also applied for the coherent superposition of multiple beam, only the first flashlight and secondary signal light need to be continued light splitting according to described spectroscopic modes, 4 bundles or even more multi-beam can be got, and make light beam between two share same nonlinear crystal and compressor in the manner described, can be achieved with Dual Implantations formula multiple beam coherent beam combination.
Technical scheme is applicable not only to the laser system of tens of PW, is also applied for the output of higher amount level or even EW.
Technical scheme is applicable not only to the laser system of femtosecond magnitude, is equally applicable to the laser system of psec, nanosecond order, only need to adjust broadening and compressor.
The present invention is applicable to any high power laser system with OPCPA terminal organ for terminal amplifier stage.
Accompanying drawing explanation
Fig. 1 is the structural representation of Dual Implantations OPCPA coherent beam combination ultra high power laser system of the present invention
Fig. 2 is flashlight and pump light angular relationship schematic diagram
Fig. 3 is flashlight and pump light time relationship schematic diagram
Fig. 4 is the structural representation of Russia's laser physics institute OPCPA coherent superposition system
Detailed description of the invention
The invention will be further described to clap watt fs-laser system (CPA/ Dual Implantations OPCPA mixing is clapped a watt fs-laser system and referred to CPA for front-end amplifier stage, and Dual Implantations OPCPA is the bat watt fs-laser system of terminal amplifier) for CPA/ Dual Implantations OPCPA mixing.
nullFig. 1 is the structural representation of Dual Implantations OPCPA coherent beam combination ultra high power laser system of the present invention，As seen from the figure，Dual Implantations OPCPA coherent beam combination ultra high power laser system of the present invention includes high s/n ratio front end 1、Stretcher 2、CPA amplifier stage 3、Beam splitter 4、First reflecting mirror 5、Second reflecting mirror 8、3rd reflecting mirror 9、4th reflecting mirror 11、5th reflecting mirror 12、6th reflecting mirror 15、7th reflecting mirror 23、8th reflecting mirror 24、First timer 6 and the second timer 7、OPCPA terminal amplifier 10、Compressor 13、PZT delay adjustment device 14、Focusing system 20、First spectroscope 16、Second spectroscope 17、Time delay measurement device 18、PID closed loop delay controller 19、Focusing system 20，OPCPA high energy pumping source 22，Refuse receptacle 25,，Condenser lens focus 21，PZT delay adjustment device 14、Time delay measurement device 18 and PID closed loop delay controller 19 form the first flashlight s1 and secondary signal light s2 closed loop time controls system.The hybrid PW laser system work process of described CPA-OPCPA is shown in [number of patent application: 201210580094.5], and described compressor designs structure is shown in [number of patent application: 201410738650.6].
The implementation process of described coherent superposition structure is:
Laser pulse is divided into two bundle the first flashlight s1 and secondary signal light s2 after CPA amplifier chain, first flashlight s1, after 50% spectroscope, converges at focus after sequentially passing through the first chronotron, reflecting mirror, OPCPA terminal amplifier, reflecting mirror, compressor, PZT delay adjustment device, focusing system；Secondary signal light s2, after 50% spectroscope, converges at focus after sequentially passing through the first chronotron, reflecting mirror, OPCPA terminal amplifier, reflecting mirror, compressor, reflecting mirror, focusing system.The coherent superposition of dual-beam can be realized when the first flashlight s1 after amplifying and secondary signal light s2 arrives the time difference of focal point less than 150as.First flashlight s1 and secondary signal light s2 is through same OPCPA terminal amplifier stage 10, and shares same OPCPA high energy pumping source 22.Regulate reflecting mirror 8,9 so that the first flashlight s1 and secondary signal light s2 all meets nonlinear angle matching condition with pump light p.The first described flashlight s1 and secondary signal light s2 wavelength are 800nm, and pulsewidth is 2ns, and pump light p wavelength is 527nm, and pulsewidth is 5nm.The first flashlight s1 and the time delay of secondary signal light s2 is controlled by regulating first chronotron the 6, second chronotron 7, the first flashlight s1 and secondary signal light s2 is made to be completely contained in pump light p, first flashlight s1, secondary signal light s2 and p light make the first flashlight s1 and secondary signal light s2 be amplified by OPCPA terminal amplifier under meeting space and time delay condition, and residual pump light p is reflected mirror 24 and enters refuse receptacle 25.Regulating the 4th reflecting mirror the 11, the 5th reflecting mirror 12 makes the first flashlight s1, secondary signal light s2 through compressor 13, and the first flashlight s1, secondary signal light s2 are compressed into femtosecond magnitude.The first flashlight s1 after compression is through PZT delay adjustment device, and PZT delay adjustment device can regulate the first flashlight s1 from OPCPA to the light path of focus 21, thus regulating the first flashlight s1, secondary signal light s2 to arrive the synchronousness at focus 21 place.Utilizing the first spectroscope the 16, the 2nd 17 that s1, s2 light is separated 3%, input time delay measures device 18, and Time delay measurement device 18 will record optical signal and be converted into the signal of telecommunication, and pass to PID closed loop delay controller 19.PID closed loop delay controller 19 analyzes and processes this signal and to PZT delay adjustment device output feedback signal.PZT delay adjustment device changes the time delay of the first flashlight s1 by regulating the light path of the first flashlight s1 arrival focus 21, makes the first flashlight s1, secondary signal light s2 arrive the time error of focus 21 less than 150as.After first flashlight s1, secondary signal light s2 line focus system on focal plane coherent superposition.
Concrete operation step is:
In 1.CPA/ Dual Implantations formula OPCPA bat watt fs-laser system, 800nm seed pulse light is to several joules of magnitudes after high s/n ratio 1, stretcher broadening 2 and CPA front-end amplifier stage 3 amplify, and pulse width is 2ns, Si Teer ratio is 0.6.Pump light p optical wavelength is 527nm, and pulsewidth is 5ns.
2.800nm light is divided into the first flashlight s1 through spectroscope 4, secondary signal light s2, by regulating the second reflecting mirror 8, 3rd reflecting mirror 9, adjust the first flashlight s1 respectively, the angle of secondary signal light s2 and pump light p light: first regulating menstruation the second reflecting mirror 8, the angle making the first flashlight s1 and pump light p becomes non-linear matches angle, adjust the 3rd reflecting mirror 9 again, secondary signal light s2 is coupled into nonlinear crystal, secondary signal light s2 is made also to become non-colinear matching angle with pump light p light, i.e. the first flashlight s1, secondary signal light s2 and the pump light p non-colinear being satisfied by nonlinear crystal mates angle.
3. regulate first chronotron the 6, second chronotron 7, make the first flashlight s1, secondary signal light s2 successively through nonlinear crystal, interval, within 1ns, in make the first flashlight s1, secondary signal light s2 be completely contained in pump light p light that pulsewidth is 5ns, and amplifies through nonlinear crystal.
4. regulate the 4th reflecting mirror the 11, the 5th reflecting mirror 12, make the first flashlight s1, secondary signal light s2 be compressed into femtosecond magnitude by compressor 13.
5. regulate focusing system 20, make the first flashlight s1, secondary signal light s2 light beam focus on same focus 21.
6. utilize first spectroscope the 16, second spectroscope 17,3% is separated from the first flashlight s1, secondary signal light s2 main optical path, measure the first flashlight s1, secondary signal light s2 phase information through Time delay measurement device 18 and be converted into the signal of telecommunication, the first flashlight s1, secondary signal light s2 light interfascicular time error signal is analyzed through PID closed loop delay controller 19, output feedback signal, passes to PZT delay adjustment device 14.PZT delay adjustment device regulates the first flashlight s1, secondary signal light s2 synchronousness to control the time difference of the first flashlight s1, secondary signal light s2 arrival focus 21 by regulating the first flashlight s1 optical path length so that the time jitter between the first flashlight s1, secondary signal light s2 is less than 150as.First flashlight s1, secondary signal light s2 can realize coherent beam combination at focal plane place.
The present invention takes full advantage of OPCPA gain by one path height and without advantages such as heat effects, make different light beam through same optical path, greatly reduce phase place during OPCPA amplifies change probabilistic impact and control the difficulty of different light interfascicular synchronicitys, the coherently combined effect of ultra high power laser system can be improved, it is achieved higher energy laser exports.
The technical scheme that the present invention proposes is applicable not only to the coherent superposition of dual-beam, it is also applied for the coherent superposition of multiple beam, only the first flashlight s1, secondary signal light s2 need to be continued light splitting according to described spectroscopic modes, 4 bundles or even more multi-beam can be got, and make light beam between two share same nonlinear crystal and compressor in the manner described, can be achieved with Dual Implantations formula multiple beam coherent beam combination.
Additionally the present invention is applicable to any with the OPCPA laser system being terminal amplifier, and front end amplifier chain can amplify for CPA or OPCPA amplifies.
The present invention is equally applicable in nanosecond, psec ultra high power laser system, only needs stretcher and the compressor of appropriate design laser system, further according to the pulsewidth of the broadened amount appropriate design pump light of flashlight, can realize the coherent superposition of light beam.Therefore, the present invention is significant to the raising of ultra high power output.
Claims (3)
- null1. a Dual Implantations formula OPCPA coherent beam combination ultra high power laser system，It is characterised by that this system includes high s/n ratio front end (1)、Stretcher (2)、Front end amplifier chain (3)、Beam splitter (4)、First reflecting mirror (5)、Second reflecting mirror (8)、3rd reflecting mirror (9)、4th reflecting mirror (11)、5th reflecting mirror (12)、6th reflecting mirror (15)、7th reflecting mirror (23)、8th reflecting mirror (24)、First chronotron (6)、Second chronotron (7)、OPCPA terminal amplifier (10)、Compressor (13)、PZT delay adjustment device (14)、First spectroscope (16)、Second spectroscope (17)、Time delay measurement device (18)、PID closed loop delay controller (19)、Focusing system (20) and OPCPA high energy pumping source (22)，Laser pulse is through described high s/n ratio front end (1)、Stretcher (2)、After front end amplifier chain (3)，The first flashlight (s1) and secondary signal light (s2) it is divided into through beam splitter (4)，It first flashlight (s1) light path is successively described the first chronotron (6)、Second reflecting mirror (8)、OPCPA terminal amplifier (10)、5th reflecting mirror (12)、Compressor (13)、PZT delay adjustment device (14)、First spectroscope (16) and focusing system (20)，After converge at focus (21)；nullIt described secondary signal light (s2) light path is successively described the first reflecting mirror (5)、Second chronotron (7)、3rd reflecting mirror (9)、OPCPA terminal amplifier (10)、4th reflecting mirror (11)、Compressor (13)、6th reflecting mirror (15)、Second spectroscope (17) and focusing system (20)，After converge at focus (21)，It is described Time delay measurement device (18) and PID closed loop delay controller (19) in the light splitting direction of described the first spectroscope (16) and the second spectroscope (17)，The outfan of described PID closed loop delay controller (19) controls end with described PZT delay adjustment device (14) and is connected，Described OPCPA terminal amplifier (10) is carried out pumping through the 7th described reflecting mirror (23) by the pump light that described OPCPA high energy pumping source (22) exports.
- 2. Dual Implantations formula OPCPA coherent beam combination ultra high power laser system according to claim 1, it is characterised in that described front end amplifier chain is OPCPA amplifier chain or CPA amplifier chain.
- 3. Dual Implantations formula OPCPA coherent beam combination ultra high power laser system according to claim 1, it is characterized in that, described the first flashlight (s1) and secondary signal light (s2) share same pump light (p), and first flashlight (s1), secondary signal light (s2) all meets nonlinear angle matching condition with pump light (p), pump light pulsewidth regulates according to the light beam pulsewidth injected and interval, by regulating the first chronotron (6) and the second chronotron (7), regulate the first flashlight (s1) and the time delay of secondary signal light (s2), it is made to be completely contained in pump light (p).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109632726A (en) * | 2018-12-13 | 2019-04-16 | 中山大学 | A kind of molecular dynamics measurement method and its device based on quantum coherent control |
| CN109741670A (en) * | 2018-11-28 | 2019-05-10 | 安徽理工大学 | A kind of nonlinear optical effect apparatus for demonstrating |
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| US20090086311A1 (en) * | 2007-08-02 | 2009-04-02 | University Of Rochester | Spectral Filtering Method and Apparatus in Optical Parametric Chirped Pulse Amplification |
| CN102664342A (en) * | 2012-05-18 | 2012-09-12 | 中国科学院上海光学精密机械研究所 | Optical parameter chirped pulse amplifier |
| CN103066484A (en) * | 2012-12-27 | 2013-04-24 | 中国科学院上海光学精密机械研究所 | CPA and OPCPA mixed type ultra high power femtosecond laser system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20090086311A1 (en) * | 2007-08-02 | 2009-04-02 | University Of Rochester | Spectral Filtering Method and Apparatus in Optical Parametric Chirped Pulse Amplification |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109741670A (en) * | 2018-11-28 | 2019-05-10 | 安徽理工大学 | A kind of nonlinear optical effect apparatus for demonstrating |
| CN109632726A (en) * | 2018-12-13 | 2019-04-16 | 中山大学 | A kind of molecular dynamics measurement method and its device based on quantum coherent control |
| CN109632726B (en) * | 2018-12-13 | 2020-10-23 | 中山大学 | Molecular dynamics measurement method and device based on quantum coherent control |
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