CN105790061B - Dual Implantations OPCPA coherent beam combination ultra high power laser system - Google Patents
Dual Implantations OPCPA coherent beam combination ultra high power laser system Download PDFInfo
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- CN105790061B CN105790061B CN201410829187.6A CN201410829187A CN105790061B CN 105790061 B CN105790061 B CN 105790061B CN 201410829187 A CN201410829187 A CN 201410829187A CN 105790061 B CN105790061 B CN 105790061B
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Abstract
A kind of Dual Implantations formula OPCPA coherent beam combination ultra high power laser system, the system combine coherent beam combination method with the hybrid ultra high power fs-laser system of Dual Implantations formula OPCPA, the final ultra high power laser output for realizing PW or even EW grades of number.It is high and the advantages that without fuel factor that OPCPA gain by one path is utilized in the present invention system, make different light beams by same optical path, greatly reduce the probabilistic difficulty influenced and control synchronism between different light beams of phase change in OPCPA amplification, the coherently combined effect of ultra high power laser system can be improved, realize the output of higher energy laser.
Description
Technical field
The present invention relates to fs-laser system, especially a kind of Dual Implantations OPCPA coherent beam combination ultra high power laser system.
Background technique
In recent decades, ultrashort and ultrahigh laser device continues to develop, and peak power reaches bat watt (1015W) magnitude, focusing peak
Value power can reach 1021W/cm2-1023W/cm2.Ultrashort and ultrahigh laser device provides unprecedented for numerous ambits
Laboratory facilities and extreme physical condition are used widely in the experiment of superpower field laser target interaction, such as ultrafast X
Ray radiation, the generation of higher hamonic wave, the acceleration of laser coronal region particle and fast ignition laser fusion etc..It is super for the overwhelming majority
For the experiment of high field laser target interaction, what is played a decisive role is the peak power density of focal point after laser focuses.Cause
This peak power density for how improving laser is the research focus in high power laser light field.
However the work bore by Primary Components such as laser medium and Compressed gratings is limited, traditional is single using improving
The method of beam laser energy is difficult to meet the requirement that energy density greatly improves, therefore multiple laser coherent superposition is the following raising
The effective way of peak power density.Peak power increases substantially (> 1025W/cm2) will be mentioned for basic quantrm electrodynamics
For theoretical and experimental verification condition, for example, in vacuum polarization effect, vacuum electron-positron pair generation etc..Coherent beam superposition
Technology will further increase (> 10 for peak power25W/cm2) more feasible method is provided.By existing CPA-OPCPA or complete
OPCPA ultra high power laser system combines the effective ways for undoubtedly increasing substantially laser power with Coherent Beam Combination.
Traditional coherently combined method be the pulse after beam splitting is amplified respectively compression (pass through different amplification process and compressor), then
It is focused conjunction beam, but coherently combined method requires high, traditional phase to the synchronism between the beam quality and light beam of single beam
Dry beam method of closing brings high difficulty to the Laser beam quality control of ultra high power laser system.
Such as the coherent beam combination test (see Fig. 4) of small energy OPCPA laser system that Russian laser physics are realized, it obtains
Optics coherence tomography pulse shortest so far was obtained, output energy is 50 μ J, pulse width 49fs, frequency 10Hz, synthesis
Efficiency is 97%.Its experimental method is that femtosecond oscillator 1 ' is generated 75MHz pulse, is broadened by stretcher 2 ', and AOPDF3 ' is pre-
Compensation and 4 ' frequency-selecting of electrooptic modulator, are divided into two bundles light through beam splitter 5 '.First light beam amplifies by nonlinear crystal 6 ', then passes through
Compressor 7 ' enters condenser lens 11 ' after compressing；Second light beam amplifies by nonlinear crystal 9 ', after the compression of compressor 10 '
Into condenser lens 11 '.The delay between two-way light beam is adjusted by time controlled system 8 ', by adjusting dispersion compensation device
Dispersion difference caused by 12 ' null grating differences, so that two beam laser focus on simultaneously occurs coherent superposition in focus.13 ' are
The time error signal measured is passed to delay adjustment device 8 ' and adjusted to delay by dual-beam time jitter measuring system
Section.But since the experimental method is using the amplification of two nonlinear crystals, two compressor compresses, introduce between biggish light beam
Optical property difference increases the coherently combined difficulty of ultra high power low-repetition-frequency PW laser system, how to reduce light beam
Between difference become ultra high power femtosecond laser coherent superposition key technology.
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 systems.The system proposes
The laser amplifier and compression method of Dual Implantations formulas, form Dual Implantations formula coherent beam combination mode.It is mono- that OPCPA is utilized in the system
Journey high gain and the advantages that without fuel factor, makes different light beams by same optical path, greatly reduces phase change in OPCPA amplification
Probabilistic influence and the difficulty for controlling synchronism between different light beams, can be improved the coherently combined of ultra high power laser system
Effect realizes the output of higher energy laser.
Technical solution of the invention is as follows:
A kind of Dual Implantations formula OPCPA coherent beam combination ultra high power laser system, feature are that the system includes high s/n ratio
Front end, stretcher, front end amplifier chain, beam splitter, the first reflecting mirror, the second reflecting mirror, third reflecting mirror, the 4th reflecting mirror,
Five reflecting mirrors, the 6th reflecting mirror, the 7th reflecting mirror, the 8th reflecting mirror, the first delayer, the second delayer, the amplification of OPCPA terminal
Device, compressor, PZT delay adjustment device, the first spectroscope, the second spectroscope, Time delay measurement device, the delay of PID closed loop
Controller, focusing system and OPCPA high energy pumping source, laser pulse seed light is through the high s/n ratio front end, stretcher, preceding
After holding amplifier chain, it is divided into signal light and signal light through beam splitter, is successively first delayer, the in signal light optical path
Two-mirror, OPCPA terminal amplifier, the 5th reflecting mirror, compressor, PZT delay adjustment device, the first spectroscope and focusing system
System, after converge at focus；It is successively that first reflecting mirror, the second delayer, third are anti-in the signal light optical path
Mirror, OPCPA terminal amplifier, the 4th reflecting mirror, compressor, the 6th reflecting mirror, the second spectroscope and focusing system are penetrated, it is rear to converge
It is the Time delay measurement device and PID closed loop in the spectroscopical light splitting direction of first spectroscope and second in focus
Circuit delay controller, the control of the output end of the PID closed loop delay controller and the PZT delay adjustment device
End processed is connected, and the pump light of the OPCPA high energy pumping source output is through the 7th reflecting mirror to the OPCPA terminal
Amplifier is pumped.
The front end amplifier chain is OPCPA amplifier chain or CPA amplifier chain.
First signal light and second signal light shares the same pump light, and the first signal light, second signal light
Meet nonlinear angle matching condition with pump light, pump light pulsewidth is adjusted according to the light beam pulsewidth and interval of injection.Pass through tune
The first delayer and the second delayer are saved, the delay of the first signal light and second signal light is adjusted, it is made to be completely contained in pumping
In light.The beam splitting light can continue beam splitting and obtain four bundles light or more, and the co-implanted same of light beam is non-thread two-by-two
Property the crystal and same compressor, form 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 amplifies by front end of CPA or OPCPA amplifier chain
Grade, Dual Implantations formula OPCPA amplifier are terminal amplifying stage, will be divided into two bundles through the amplified light pulse of front-end amplifier stage, two beams
Light is by the amplification of the same OPCPA amplifier, the same compressor compresses, then line focus lens focus is in realizing phase in same point
Dry superposition.The system had not only overcome limitation of the nonlinear crystal bore to amplified energy in single beam OPCPA amplification process, but also filled
Point high-gain in OPCPA amplification process is utilized, without fuel factor the advantages of, reduce the difference during closing beam between light beam, greatly
It reduces greatly and closes beam difficulty.The output-index of original ultra high power laser system may be implemented in this system monochromatic light road, is concerned in addition
The significantly promotion of peak power may be implemented in beam combination structure.Whole system has compact-sized, the high advantage of stability, can
To be applied to the key areas with important scientific meaning and strategic high technology innovation.
Technical solution of the present invention is suitable for different operating wave band, need only select different operating medium as needed.
Technical solution of the present invention is applicable not only to the coherent superposition of dual-beam, is also applied for the coherent superposition of multiple beam,
Only the first signal light and second signal light need to be continued to be divided according to the spectroscopic modes, 4 beams or even more multi-beam can be got,
And make two-by-two light beam share same nonlinear crystal and compressor in the manner described, can be achieved with Dual Implantations formula multiple beam phase
Dry beam combination.
Technical solution of the present invention is applicable not only to the laser system of tens of PW, is also applied for the defeated of higher amount grade or even EW
Out.
Technical solution of the present invention is applicable not only to the laser system of femtosecond magnitude, is equally applicable to picosecond, nanosecond order
Laser system, only need to adjust broadening and compressor.
The present invention is suitable for any using OPCPA terminal organ as the high power laser system of terminal amplifying stage.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Dual Implantations OPCPA coherent beam combination ultra high power laser system of the present invention
Fig. 2 is signal light and pump light angular relationship schematic diagram
Fig. 3 is signal light and pump light time relationship schematic diagram
Fig. 4 for Russian laser physics institute OPCPA coherent superposition system structural schematic diagram
Specific embodiment
(watt femtosecond is clapped in CPA/ Dual Implantations OPCPA mixing so that CPA/ Dual Implantations OPCPA is mixed and clapped watt fs-laser system as an example
Laser system refers to that using CPA as front-end amplifier stage, Dual Implantations OPCPA is the bat watt fs-laser system of terminal amplifier) to this
Invention is described further.
Fig. 1 is the structural schematic diagram 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 amplifying stage
3, beam splitter 4, the first reflecting mirror 5, the second reflecting mirror 8, third reflecting mirror 9, the 4th reflecting mirror 11, the 5th reflecting mirror the 12, the 6th
Reflecting mirror 15, the 7th reflecting mirror 23, the 8th reflecting mirror 24, the first timer 6 and the second timer 7, OPCPA terminal
Amplifier 10, compressor 13, PZT delay adjustment device 14, focusing system 20, the first spectroscope 16, the second spectroscope 17, delay
Measurement device 18, PID closed loop delay controller 19, focusing system 20, OPCPA high energy pumping source 22, dustbin 25, gather
Focus lens focus 21, PZT delay adjustment device 14, Time delay measurement device 18 and the composition of PID closed loop delay controller 19 the
One signal light s1 and second signal light s2 closed loop time control system.The hybrid PW laser system work of the CPA-OPCPA
See as process [number of patent application: 201210580094.5], the compressor designs structure see [number of patent application:
201410738650.6】。
The implementation process of the coherent superposition structure are as follows:
Laser pulse is divided into two beam the first signal light s1 and second signal light s2, the first signal light s1 after CPA amplifier chain
After 50% spectroscope, successively pass through the first delayer, reflecting mirror, OPCPA terminal amplifier, reflecting mirror, compressor, PZT
Focus is converged at after delay adjustment device, focusing system；Second signal light s2 successively prolongs by first after 50% spectroscope
When device, reflecting mirror, OPCPA terminal amplifier, reflecting mirror, compressor, reflecting mirror, converge at focus after focusing system.Work as amplification
The phase of dual-beam can be realized in the time difference that the first signal light s1 and second signal light s2 afterwards reaches focal point when being less than 150as
Dry superposition.First signal light s1 and second signal light s2 passes through the same OPCPA terminal amplifying stage 10, and shares same
OPCPA high energy pumping source 22.Reflecting mirror 8,9 is adjusted, so that the first signal light s1 and second signal light s2 meet with pump light p
Nonlinear angle matching condition.The first signal light s1 and second signal light s2 wavelength is 800nm, pulsewidth 2ns, pumping
Light p wavelength is 527nm, pulsewidth 5nm.By adjust the first delayer 6, the second delayer 7 come control the first signal light s1 and
The delay of second signal light s2 is completely contained in the first signal light s1 and second signal light s2 in pump light p, the first signal light
S1, second signal light s2 and p light make the first signal light s1 by OPCPA terminal amplifier in the case where meeting space and time delay condition
Amplified with second signal light s2, residual pump light p enters dustbin 25 through reflecting mirror 24.Adjust the 4th reflecting mirror 11,
Five reflecting mirrors 12 make the first signal light s1, second signal light s2 by compressor 13, the first signal light s1, second signal light s2 quilt
It is compressed to femtosecond magnitude.Compressed first signal light s1 passes through PZT delay adjustment device, and PZT delay adjustment device can be adjusted
Light path of the first signal light s1 from OPCPA to from focus 21 is saved, so that adjusting the first signal light s1, second signal light s2 reaches coke
Synchronousness at point 21.S1, s2 light are separated 3% using the first spectroscope the 16, the 2nd 17, input time delay measurement device
18, Time delay measurement device 18 will measure optical signal and be converted into electric signal, and pass to PID closed loop delay controller 19.PID
The analysis of closed loop delay controller 19 handles the signal and exports feedback signal to PZT delay adjustment device.PZT delay adjustment
The light path that device reaches focus 21 by adjusting the first signal light s1 changes the delay of the first signal light s1, makes the first signal light
The time error that s1, second signal light s2 reach focus 21 is less than 150as.First signal light s1, second signal light s2 line focus
After system on focal plane coherent superposition.
Concrete operation step are as follows:
800nm seed pulse light is through high s/n ratio 1, broadening in 1.CPA/ Dual Implantations formula OPCPA bat watt fs-laser system
Device is broadened to several joules of magnitudes after 2 and CPA front-end amplifier stage 3 amplifies, and pulse width 2ns, Si Teer ratio is 0.6.Pumping
Light p light wave a length of 527nm, pulsewidth 5ns.
2.800nm light divides through spectroscope 4 for the first signal light s1, second signal light s2, by adjust the second reflecting mirror 8,
Third reflecting mirror 9 adjusts separately the angle of the first signal light s1, second signal light s2 and pump light p light: menstruation regulating second is anti-first
Mirror 8 is penetrated, makes the angle of the first signal light s1 and pump light p at non-linear matches angle, then adjust third reflecting mirror 9, by the second letter
Number light s2 is coupled into nonlinear crystal, makes second signal light s2 and pump light p light also at non-colinear matching angle, i.e. the first signal light
S1, second signal light s2 match angle with the pump light p non-colinear for being all satisfied nonlinear crystal.
3. adjust the first delayer 6, the second delayer 7 so that the first signal light s1, second signal light s2 successively pass through it is non-
Linear crystal, time interval make the first signal light s1, second signal light s2 be completely contained in the pump of pulsewidth 5ns within 1ns
In the light p light of Pu, and amplify through nonlinear crystal.
4. adjusting the 4th reflecting mirror 11, the 5th reflecting mirror 12, the first signal light s1, second signal light s2 is made to pass through compressor
13 are compressed into femtosecond magnitude.
5. adjusting focusing system 20, the first signal light s1, second signal light s2 light beam is made to focus on same focus 21.
6. utilizing the first spectroscope 16, the second spectroscope 17, divide from the first signal light s1, second signal light s2 main optical path
Out 3%, the first signal light s1, second signal light s2 phase information are measured by Time delay measurement device 18 and are converted into electric signal,
Time error signal between the first signal light s1, second signal light s2 light beam, output are analyzed through PID closed loop delay controller 19
Feedback signal passes to PZT delay adjustment device 14.PZT delay adjustment device is by adjusting the first signal light s1 optical path length
The first signal light s1, second signal light s2 synchronousness are adjusted to control the first signal light s1, second signal light s2 and reach coke
The time difference of point 21, so that the time jitter between the first signal light s1, second signal light s2 is less than 150as.First signal light s1,
Second signal light s2 can realize coherent beam combination in focal plane.
It is high and the advantages that without fuel factor that the present invention takes full advantage of OPCPA gain by one path, makes different light beams by same light
Road greatly reduces the probabilistic difficulty influenced and control synchronism between different light beams of phase change in OPCPA amplification, can
To improve the coherently combined effect of ultra high power laser system, the output of higher energy laser is realized.
Technical solution proposed by the present invention is applicable not only to the coherent superposition of dual-beam, is also applied for the relevant folded of multiple beam
Add, only the first signal light s1, second signal light s2 need to be continued to be divided according to the spectroscopic modes, 4 beams or even more can be got
Multi-beam, and make two-by-two light beam share same nonlinear crystal and compressor in the manner described, can be achieved with Dual Implantations formula
Multiple beam coherent beam combination.
In addition the present invention is suitable for any using OPCPA as the laser system of terminal amplifier, and front end amplifier chain can be CPA
Amplification or OPCPA amplification.
The present invention was equally applicable in nanosecond, picosecond ultra high power laser system, need to only rationally design laser system
Stretcher and compressor rationally design the pulsewidth of pump light further according to the signal light amount of being broadened, and the relevant folded of light beam can be realized
Add.Therefore, the present invention is significant to the raising of ultra high power output power.
Claims (3)
1. a kind of Dual Implantations formula OPCPA coherent beam combination ultra high power laser system, before being characterized in that the system includes high s/n ratio
Hold (1), stretcher (2), front end amplifier chain (3), beam splitter (4), the first reflecting mirror (5), the second reflecting mirror (8), third reflection
Mirror (9), the 4th reflecting mirror (11), the 5th reflecting mirror (12), the 6th reflecting mirror (15), the 7th reflecting mirror (23), the 8th reflecting mirror
(24), the first delayer (6), the second delayer (7), OPCPA terminal amplifier (10), compressor (13), PZT timer
Part (14), the first spectroscope (16), the 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 the high s/n ratio front end (1), stretcher
(2), after front end amplifier chain (3), it is divided into the first signal light (s1) and second signal light (s2), the first signal light through beam splitter (4)
(s1) successively through first delayer (6), the second reflecting mirror (8), OPCPA terminal amplifier (10), the 5th reflecting mirror
(12), compressor (13), PZT delay adjustment device (14), the first spectroscope (16) and focusing system (20), after converge at focus
(21)；The second signal light (s2) is successively through first reflecting mirror (5), the second delayer (7), third reflecting mirror
(9), OPCPA terminal amplifier (10), the 4th reflecting mirror (11), compressor (13), the 6th reflecting mirror (15), the second spectroscope
(17) and focusing system (20) focus (21) are converged at after, in first spectroscope (16) and the second spectroscope (17)
Being divided direction is the Time delay measurement device (18) and PID closed loop delay controller (19), the PID closed loop
The output end of delay controller (19) is connected with described PZT delay adjustment device (14) control terminal, the OPCPA high energy pump
The pump light of Pu source (22) output pumps the OPCPA terminal amplifier (10) through the 7th reflecting mirror (23)
Pu.
2. Dual Implantations formula OPCPA coherent beam combination ultra high power laser system according to claim 1, which is characterized in that institute
The front end amplifier chain stated 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, which is characterized in that institute
The first signal light (s1) and second signal light (s2) stated share the same pump light (p), and the first signal light (s1), the second letter
Number light (s2) meets nonlinear angle matching condition with pump light (p), and pump light pulsewidth is according to the light beam pulsewidth of injection and interval
It adjusts, by adjusting the first delayer (6) and the second delayer (7), adjusts the first signal light (s1) and second signal light (s2)
Delay, be completely contained in it in pump light (p).
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| CN109741670B (en) * | 2018-11-28 | 2021-06-11 | 安徽理工大学 | Nonlinear optical effect demonstration device |
| CN109632726B (en) * | 2018-12-13 | 2020-10-23 | 中山大学 | Molecular dynamics measurement method and device based on quantum coherent control |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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