CN103199426A - CPA, CPRA and optical parametric chirped pulse amplification (OPCPA) mixing type ultrahigh peak power laser pulse amplifying device - Google Patents
CPA, CPRA and optical parametric chirped pulse amplification (OPCPA) mixing type ultrahigh peak power laser pulse amplifying device Download PDFInfo
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Abstract
Provided is a CPA, CPRA and optical parametric chirped pulse amplification (OPCPA) mixing type ultrahigh peak power laser pulse amplifying device. Based on an existing neodymium glass macro-energy pumping laser system and large diameter potassium dihydrogen phosphate deuterium nonlinear optical crystal, the CPA, CPRA and OPCPA mixing type ultrahigh peak power laser pulse amplifying device is connected with a titanium gem CPA pre-amplifier and an OPCPA terminal amplifier through a CPRA amplifier, and a 800nm-band macro-energy broadband chirped pulse is moved to a new band through CPRA frequency shift and serves as broadband macro-energy chirp incident pulse of the OPCPA terminal amplifier. According to the CPA, CPRA and OPCPA mixing type ultrahigh peak power laser pulse amplifying device, the advantages of the high stability and the high efficiency of the titanium gem CPA, the high single-pass gain, the large gain bandwidth, the non-thermal effect, the non-parasitic oscillation of the OPCPA are fully combined, and stable and efficient femtosecond laser pulse output with the peak power which reaches to 10 Pat w magnitude or even higher can be achieved.
Description
Technical field
The present invention relates to superelevation peak power laser pulse amplifying device, particularly the hybrid superelevation peak power of a kind of CPA, CPRA and OPCPA laser pulse amplifying device.Described CPA is the abbreviation that chirped pulse amplifies, and described CPRA is the abbreviation that the chirped pulse Raman amplifies, and described OPCPA is the abbreviation that the optical parameter chirped pulse amplifies, described superelevation peak power refer to the peak power of laser reach number clap watt (1 clap watt=10
15W) more than.
Background technology
Since the 80s and 90s in last century, the mankind that develop into that chirped pulse amplifies (being designated hereinafter simply as CPA) and optical parameter chirped pulse amplification (being designated hereinafter simply as OPCPA) successfully provide pulse duration to reach femtosecond magnitude (10
-15S), peak power reaches and claps watts (10
15W) ultra-intense ultra-short laser pulse of magnitude.The focus strength of ultra-intense ultra-short laser pulse surpasses 10 at present
18W/cm
2, and the highest focus strength can reach 10
22W/cm
2So high focus strength greatly can have been expanded the application of the high field science in the theory of relativity category, has promoted the development of a series of research fields such as generation of generation, the theory of relativity self focusing, high energy electron and proton acceleration, neutron and the positron of generation, r ray such as the x ray.
When the laser focus strength further is promoted to super the theory of relativity light intensity (greater than 10
23W/cm
2), the high field science will further be advanced to superpower brand-new category, thereby open up the new direction in new forward position of a series of superpower ultrafast science.Particularly physical vacuum, dark energy and dark matter, high field high-energy-density physics, explore some basic science problems that correlated strategy high-tech sector that miniaturization superelevation gradient particle accelerates ultra-intense laser field such as new principle, desk-topization high brightness X ray and matter interaction relates to.At present, a plurality of research institutions are all competitively developing and are developing superelevation peak power fs-laser system in the world, and target is based on that number is clapped watt even 10 claps the femtosecond laser device of watt peak powers, realizes greater than 10
23W/cm
2The laser focus strength.Wherein representative two is respectively the Vulcan10PW laser aid presided over by Britain Rutherford experiment chamber and the ELI laser aid of and investment leading by European Union at the superelevation peak power femtosecond laser device of building.
These two superelevation peak power femtosecond laser devices have adopted different laser pulses to amplify scheme.Wherein the Vulcan10PW device is to adopt pure OPCPA basically, and its terminal amplifier intends adopting the parameter chirped pulse based on heavy caliber potassium dideuterium phosphate (DKDP) nonlinear crystal to amplify (OPCPA); And the ELI laser aid, though its front end has adopted OPCPA, its main amplifier, especially terminal amplifier then are the CPA that intends adopting based on heavy caliber titanium jewel.
The basic principle of CPA is to be the chirped pulse of hundreds of psecs even nanosecond order with the mode locking pulse broadening of femtosecond magnitude before amplification, carries out pulse compression again after amplifying step by step, thereby obtains the laser pulse of high-peak power, short pulse width.And the different of OPCPA and CPA maximum are exactly the amplifying stage among the CPA to be replaced with the nonlinear optical parameter amplify.These two kinds of technology respectively have strengths and weaknesses by comparison: the CPA technology maturation, energy stability and pointing stability are better in the amplification process, and the requirement of pumped laser system is lower than the OPCPA technology, and be simple relatively based on its operation of laser aid of CPA technology.OPCPA, energy stability, pointing stability relatively poor relatively, and need the pumped laser system of the single longitudinal mode of certain pulses width usually, will be more complicated relatively based on its operation of laser aid of OPCPA therefore.But OPCPA has higher gain by one path, littler thermal effect, bigger gain bandwidth, can support narrower femto-second laser pulse.
Based on existing engineering condition, especially in the terminal amplifier of superelevation peak power femtosecond laser device, OPCPA compares the feasibility that CPA has more enforcement.Because, the CPA of the very difficult support 10 bat watt magnitudes of the titanium gem crystal size that can realize at present (be difficult to reach～200mm bore).And based on large-sized titanium jewel like this, because the crystal lateral dimension is more than the several times of logical optical thickness, parasitic oscillation suppresses to become a crucial difficult problem, and the parasitic oscillation effect in the laser amplification process can cause final amplification efficient and seriously influence.And for OPCPA, though the complexity of its pumped laser system is bigger, but the size of the potassium dideuterium phosphate crystal that it is required (can greater than the 200mm bore) is enough to support that 10 clap the OPCPA of watt magnitudes, and the gain by one path height of OPCPA, does not have parasitic oscillation and influence of thermal effect.Therefore, terminal amplifier adopts the OPCPA technology should have more exploitativeness.
The present design of Vulcan10PW laser aid is (referring to C Hernandez-Gomez, S P Blake, etc.Journal of Physics:ConferenceSeries244 (2010) 032006) as shown in Figure 1.Broadband seed pulse by the 900nm wave band of OPCPA amplifying stage 1 output of millijoule magnitude enters into stretcher 2, seed pulse is broadened to be injected into first order LBO OPCPA prime amplifier (3) to～3ns and second level LBO OPCPA prevents big device 4, and OPCPA prime amplifier 3 and 4 is that the pump laser 5 of 4J carries out pumping by energy.The energy of OPCPA prime amplifier output is that to be injected into two-stage be that 600J, wavelength are that the high energy OPCPA pumping source 8 of 527nm carries out pumping by the two-way energy respectively based on the OPCPA terminal amplifier 6 of DKDP nonlinear crystal and 7, OPCPA terminal amplifier to the seed pulse of 1J magnitude.Be that the amplification pulse of 500J magnitude is injected into vacuum compression device 9 after expanding by the energy of OPCPA terminal amplifier output, the peak power of the final output in compression back 300J/30fs is the femto-second laser pulse of 10PW.
The terminal amplifier of this design has adopted the potassium dideuterium phosphate crystal.This is because have only the growth size of potassium dideuterium phosphate crystal and potassium dihydrogen phosphate crystal can support the OPCPA of superelevation peak power to amplify at present, and the gain spectrum width of potassium dihydrogen phosphate crystal is less than the potassium dideuterium phosphate crystal, and potassium dihydrogen phosphate crystal is less than the potassium dideuterium phosphate crystal in the transmitance of region of ultra-red.Therefore the potassium dideuterium phosphate crystal is the optimal selection that realizes that broadband OPCPA high energy amplifies at present.The optical maser wavelength of this design is chosen in 900nm, and this is that gain characteristic by potassium dideuterium phosphate crystal under the present wavelength (normally 527nm) that can support the high energy pumping source that the superelevation peak power is amplified and this pumping wavelength determines.The potassium dideuterium phosphate crystal is wide more much bigger than the gain spectral of 800nm wave band at the gain spectrum width of 900nm wave band.
This scheme has adopted pure OPCPA technology to carry out the laser pulse amplification, although have the potentiality that realize 10PW magnitude superelevation peak power, the complexity of the energy stability of laser aid, pointing stability and system's operation maintenance will cause bigger influence to the overall performance of laser aid.
Summary of the invention
The objective of the invention is to propose the hybrid superelevation peak power of a kind of CPA, CPRA and OPCPA laser pulse amplifying device.This device carries out the non-linear frequency conversion by the CPRA amplifier to the output pulse of titanium jewel CPA amplifier and amplifies, and with frequency displacement and the laser pulse after amplifying be injected into follow-up OPCPA terminal amplifier, the 800nm wave band of laser pulse that has solved the output of titanium jewel CPA amplifier can't realize that in the OPCPA terminal amplifier based on the potassium dideuterium phosphate crystal broadband amplifies the problem of output.This device fully combines the advantage of the high gain by one path of high stability, high conversion efficiency and the OPCPA of CPA, big gain bandwidth, no thermal effect, no parasitic oscillation, can realize stablizing, peak power reaches that number is clapped watt even the femto-second laser pulses of 10 bat watt magnitudes are exported efficiently.
Technical solution of the present invention is as follows:
A kind of CPA, the hybrid superelevation peak power of CPRA and OPCPA laser pulse amplifying device, characteristics are that this device comprises: titanium jewel femtosecond mode locking pulse oscillator, pulse stretcher, titanium jewel CPA preamplifier, the CPRA amplifier, the OPCPA terminal amplifier, the vacuum beam-expanding system, the vacuum compression device, the Nd:YAG pump laser, CPA amplifier high energy pump laser and OPCPA terminal amplifier high energy pumping source, described titanium jewel CPA preamplifier is successively by the broadband regeneration amplifier, first order multi-pass amplifier and second level multi-pass amplifier are formed, and described CPRA amplifier is by beam splitting chip, the Raman frequency shift device, pumping synchronizing relay control light path and raman amplifier are formed; Described OPCPA terminal amplifier is made up of first order OPCPA amplifier and second level OPCPA amplifier successively, and the position relation of above-mentioned each components and parts is as follows:
Described pulse stretcher places after the titanium jewel femtosecond mode locking pulse oscillator, this pulse stretcher with the femtosecond seed pulse broadening of titanium jewel femtosecond mode locking pulse oscillator output is～chirped pulse of 3ns, chirped pulse behind the broadening passes through the broadband regeneration amplifier of described titanium jewel CPA preamplifier successively, first order multi-pass amplifier, be injected into described CPRA amplifier after the multi-pass amplifier of the second level, in the CPRA amplifier, described chirped pulse is divided into transmitted beam laser pulse and the output of reflecting bundle laser pulse through described beam splitting chip: after the reflecting bundle laser pulse that energy is stronger is controlled light path through the pumping synchronizing relay, be injected in the described raman amplifier as pumping pulse, the very weak transmitted beam laser pulse of described energy at first enters described Raman frequency shift device and carries out frequency inverted, with the laser pulse after the frequency displacement of Raman frequency shift device output as seed pulse, be injected in the described raman amplifier and amplify, the chirped pulse that is amplified by raman amplifier after the frequency displacement of back output carries out after energy amplifies through first order OPCPA amplifier and second level OPCPA amplifier more successively, enter into described vacuum beam-expanding system, through the vacuum beam-expanding system expand and after picture transmits, laser pulse enters into the vacuum compression device and carries out pulse compression, finally realizes the femto-second laser pulse output of superelevation peak power; Described Nd:YAG pump laser carries out pumping to described broadband regeneration amplifier and first order multi-pass amplifier, described CPA amplifier high energy pump laser carries out pumping to second level multi-pass amplifier, and described OPCPA terminal amplifier high energy pumping source carries out pumping to first order OPCPA amplifier and the second level OPCPA amplifier of described OPCPA terminal amplifier.
Nonlinear dielectric in the described CPRA amplifier in first order Raman frequency shift device and the second level raman amplifier is solid dielectric or gas medium, decides according to required wavelength after the energy of incident chirped pulse and the frequency displacement.
The degree of regulation of described pumping synchronizing relay control light path need be accurate to picosecond magnitude.
Described first order OPCPA amplifier and second level OPCPA amplifier are based on the OPCPA amplifier of heavy caliber potassium dideuterium phosphate nonlinear optical crystal.
The present invention has following technique effect:
The present invention is a kind of hybrid superelevation peak power laser pulse amplifying device that amplifies (CPA), chirped pulse Raman amplification (CPRA) and optical parameter chirped pulse amplification (OPCPA) technology in conjunction with chirped pulse.This device carries out non-linear conversion and amplification by the CPRA amplifier to the output wavelength of titanium jewel CPA preamplifier, and being injected into follow-up OPCPA terminal amplifier, the 800nm wave band of laser pulse that has overcome the output of titanium jewel CPA preamplifier can't realize the problem of broadband amplification output in the OPCPA terminal amplifier based on the potassium dideuterium phosphate crystal.
The present invention passes through the CPRA amplifier effectively in conjunction with titanium jewel CPA preamplifier and OPCPA terminal amplifier.Overcome original based on titanium jewel CPA technology in superelevation peak power laser impulse amplification system because titanium gem crystal size and parasitic oscillation cause the technical bottleneck problem that energy can not further amplify etc. and based on the harsh requirement of pure OPCPA technology laser system to the stability of beam-pointing and stability and time-delay, the present invention fully combines the high stability of CPA, the high gain by one path of high conversion efficiency and OPCPA, big gain bandwidth, no thermal effect, the advantage of no parasitic oscillation can realize stablizing, peak power reaches that number is clapped watt even the 10 femto-second laser pulses outputs of clapping watt magnitudes efficiently.
The present invention is applicable to the different operating wave band, need only select different Raman nonlinear operation media to get final product in the CPRA amplifier as required.
CPRA amplifier of the present invention has carried out non-linear conversion to the output wavelength of titanium jewel CPA preamplifier in amplification process, realized the laser pulse output of new wave band, therefore can suppress the noise of the 800nm wave band of titanium jewel CPA preamplifier output, thereby promote the signal to noise ratio of whole laser amplifier system.
Description of drawings
Fig. 1 is the structural representation of the Vulcan10PW laser aid of Britain's Rutherford experiment chamber proposition
Fig. 2 is the structural representation of CPA of the present invention, CPRA and the hybrid superelevation peak power of OPCPA laser pulse amplifying device
Fig. 3 is the structural representation of OPCPA terminal amplifier high energy pumping source of the present invention
Embodiment
Fig. 2 also is the structural representation of one embodiment of the invention for the structural representation of CPA of the present invention, CPRA and the hybrid superelevation peak power of OPCPA laser pulse amplifying device, and existing the invention will be further described in conjunction with Fig. 2 and embodiment.
As seen from Figure 2, the hybrid superelevation peak power of CPA of the present invention, CPRA and OPCPA laser pulse amplifying device comprises: titanium jewel femtosecond mode locking pulse oscillator 10, pulse stretcher 11, titanium jewel CPA preamplifier 12, CPRA amplifier 13, OPCPA terminal amplifier 14, vacuum beam-expanding system 15, vacuum compression device 16, Nd:YAG pump laser 17, the high energy pump laser 18 of CPA amplifier and the high energy pumping source 19 of OPCPA terminal amplifier.Above-mentioned titanium jewel CPA preamplifier 12 is made up of broadband regeneration amplifier 20, first order multi-pass amplifier 21, second level multi-pass amplifier 22 successively.Above-mentioned CPRA amplifier 13 is made up of beam splitting chip 23, Raman frequency shift device 24, pumping synchronizing relay control light path 25 and raman amplifier 26.Above-mentioned OPCPA terminal amplifier 14 is made up of first order OPCPA amplifier 27 and second level OPCPA amplifier 28 successively.Adopt two square potassium dideuterium phosphate crystal that are of a size of 220mm in the present embodiment in first order OPCPA amplifier 27 and the second level OPCPA amplifier 28.17 pairs of described broadband regeneration amplifiers 20 of described Nd:YAG pump laser and first multi-pass amplifier 21 carry out pumping.18 pairs of second level multi-pass amplifiers of described CPA amplifier high energy pump laser 22 carry out pumping.Wherein Nd:YAG pump laser 17 and CPA amplifier high energy pump laser 18 are ripe commercial lasers.19 pairs of described OPCPA terminal amplifiers 5 of described OPCPA terminal amplifier high energy pumping source carry out pumping.
Described OPCPA terminal amplifier high energy pumping source 19 be short pulse duration (about 2-3ns, 1ns=10
-9S) neodymium glass laser system, its structure as shown in Figure 3.This system is made up of single longitudinal mode continuous laser seed source 29, fiber strength modulator 30, regenerative amplifier 31, neodymium glass amplifier chain 32, frequency multiplier 33.The pulse of regenerative amplifier 31 outputs is divided into two-way, enters into two same neodymium glass amplifier chains 32, frequency multiplier 33 respectively.Exportable two-way pulse duration 2-3ns, wavelength are that 527nm, energy are the pumping pulse of 600J after amplification and frequency multiplication.
The course of work of this contrive equipment is as follows:
Femtosecond seed pulse by 10 outputs of titanium jewel femtosecond mode locking pulse oscillator is injected in the pulse stretcher 11, and pulse duration is broadened to 2～3ns.Seed pulse after broadened is injected in the titanium jewel CPA preamplifier 12, pass through broadband regeneration amplifier 20, first order multi-pass amplifier 21 and second level multi-pass amplifier 22 successively after, the energy lift of 800nm wave band seed pulse is to～10J magnitude.Wherein 17 pairs of broadband regeneration amplifiers 20 of Nd:YAG laser and first order multi-pass amplifier 21 carry out pumping.CPA amplifier high energy pump laser 18 then carries out pumping to second level multi-pass amplifier 22.Be injected into the CPRA amplifier 13 from the laser pulse of titanium jewel CPA preamplifier 12 outputs.Laser pulse at first is divided into two bundles through beam splitting chip 23.The beam of laser pulse that wherein energy is stronger becomes the pumping laser of raman amplifier 26 after controlling light path 25 through the pumping synchronizing relay.Carry out frequency inverted and the very weak laser pulse of another beam energy at first enters Raman frequency shift device 24,, be injected in the raman amplifier 26 and amplify as seed pulse with the laser pulse after the frequency displacement.The pulse of raman amplifier 26 outputs is injected in the OPCPA terminal amplifier 14.Behind the first order OPCPA amplifier 27 and second level OPCPA amplifier 28 of process based on the potassium dideuterium phosphate crystal, the energy of 900nm wave band seed pulse is promoted to hundred joules even hundreds of joules of magnitudes.Wherein the high energy pumping source 19 of OPCPA amplifier is used for the pumping of OPCPA terminal amplifier 14.Through the high energy pulse of OPCPA terminal amplifier 14 outputs, after expanding through vacuum beam-expanding system 15 and looking like to transmit, be injected into and carry out the pulsewidth compression in the vacuum compression box 16.Compression back final output peak power reaches that number is clapped watt even 10 claps the femto-second laser pulse of watt magnitudes.
The hybrid ultra high power fs-laser system of above-mentioned CPA, CPRA and OPCPA, concrete job step can be summarized as follows:
(1) titanium jewel femtosecond mode locking pulse oscillator 10 produces the ultrashort pulse sequence of the 10fs-15fs of 800nm wave band, and the spectrum overall with is about about 150nm;
(2) ultrashort pulse sequence is in stretcher 11, and stretcher 11 becomes ultra-short pulse-width expansion the chirped pulse of 2～3ns magnitude;
(4) chirped pulse behind the broadening is injected in the broadband regeneration amplifier 20 with in the first order multi-pass amplifier 21 and carries out the energy amplification, 17 pairs of regenerative amplifiers 20 of Nd:YAG laser and first order multi-pass amplifier 21 that 2 repetition rates are 10Hz carry out pumping, and the gross energy of pumping is 400mJ.First order multi-pass amplifier 21 is six logical amplifiers of two end pumpings, and utilizes cooling water that the titanium jewel in the first order multi-pass amplifier 21 is cooled off, and the pulsed laser energy after the amplification is about 120mJ, the about 100nm of spectrum overall with;
(5) pulse from 21 outputs of first order multi-pass amplifier is injected into the second level multi-pass amplifier 22.5 logical amplifiers of second level multi-pass amplifier 22 both-end pumpings carry out sub-cooled to the titanium jewel in the amplifier, and chilling temperature reaches about 140K.18 pairs of second level multi-pass amplifiers of two CPA amplifier high energy pump lasers 22 carry out pumping, and the gross energy of pumping is 20J.Pulse energy after the amplification is about 9J, the about 100nm of spectrum overall with;
(5) pulse from 22 outputs of second level multi-pass amplifier is injected into the CPRA amplifier 13.Laser pulse at first is divided into two bundles through beam splitting chip 23.That wherein very weak bundle laser pulse is injected in the Raman frequency shift device 24 as seed pulse, and that very strong bundle laser pulse then becomes the pumping laser of raman amplifier 26 after controlling light path 25 by the pumping synchronizing relay.By selecting suitable Raman nonlinear dielectric, can in Raman frequency shift device 24, produce the seed pulse of specific new wave band based on the Raman scattering principle, for example produce the seed pulse of 900nm wave band.This seed pulse is injected into carries out energy in the raman amplifier 26 and amplify.Pump light and the delay inequality between the seed light of raman amplifier 26 need be controlled at 1ps(1ps=10
-12S) magnitude.Through can produce power behind the CPRA amplifier being～the broadband chirped pulse of the 900nm wave band of 1J magnitude;
(6) pulse from 13 outputs of CPRA amplifier is injected into the OPCPA terminal amplifier 14.After passing through first order OPCPA amplifier 27 and second level OPCPA amplifier 28 successively, pulse energy is promoted to the 500J magnitude.Adopt two square potassium dideuterium phosphate crystal that are of a size of 220mm in first order OPCPA amplifier 27 and the second level OPCPA amplifier 28.Be that 2～3ns, wavelength are that the pumping pulse of 527nm is carried out pumping to first order OPCPA amplifier 27 and second level OPCPA amplifier 28 respectively by the two-way pulse duration of high energy pumping source 19 output of OPCPA amplifier;
(7) high energy pulse of output expands through vacuum beam-expanding system 15 and as after transmitting, enters into vacuum compression device 16 and carry out the pulsewidth compression from OPCPA terminal amplifier 14.The pulse of the exportable 300J/30fs in compression back, corresponding peak power can reach 10PW.
The present invention proposes the hybrid superelevation peak power of a kind of CPA, CPRA and OPCPA laser pulse amplifying device.This device carries out non-linear conversion and amplification by the CPRA amplifier to the output wavelength of titanium jewel CPA preamplifier, and being injected into follow-up OPCPA terminal amplifier, the 800nm wave band of laser pulse that has solved the output of titanium jewel CPA amplifier can't realize the problem of broadband amplification output in the OPCPA terminal amplifier based on the potassium dideuterium phosphate crystal.This device fully combines the advantage of the high gain by one path of high stability, high conversion efficiency and the OPCPA of CPA, big gain bandwidth, no thermal effect, no parasitic oscillation, can realize stablizing, peak power reaches that number is clapped watt even the femto-second laser pulses of 10 bat watt magnitudes are exported efficiently.
Claims (4)
1. CPA, the hybrid superelevation peak power of CPRA and OPCPA laser pulse amplifying device, be characterised in that this device comprises: titanium jewel femtosecond mode locking pulse oscillator (10), pulse stretcher (11), titanium jewel CPA preamplifier (12), CPRA amplifier (13), OPCPA terminal amplifier (14), vacuum beam-expanding system (15), vacuum compression device (16), Nd:YAG pump laser (17), CPA amplifier high energy pump laser (18) and OPCPA terminal amplifier high energy pumping source (19), described titanium jewel CPA preamplifier (12) is successively by broadband regeneration amplifier (20), first order multi-pass amplifier (21) and second level multi-pass amplifier (22) are formed, and described CPRA amplifier (13) is by beam splitting chip (23), Raman frequency shift device (24), pumping synchronizing relay control light path (25) and raman amplifier (26) are formed; Described OPCPA terminal amplifier (14) is made up of first order OPCPA amplifier (27) and second level OPCPA amplifier (28) successively, and the position relation of above-mentioned each components and parts is as follows:
Described pulse stretcher (11) places described titanium jewel femtosecond mode locking pulse oscillator (10) afterwards, this pulse stretcher (11) with the femtosecond seed pulse broadening of titanium jewel femtosecond mode locking pulse oscillator (10) output is～chirped pulse of 3ns, chirped pulse behind the broadening passes through the broadband regeneration amplifier (20) of described titanium jewel CPA preamplifier (12) successively, first order multi-pass amplifier (21), second level multi-pass amplifier (22) is injected into described CPRA amplifier (13) afterwards, in CPRA amplifier (13), chirped pulse is divided into transmitted beam laser pulse and the output of reflecting bundle laser pulse through described beam splitting chip (23): after the reflecting bundle laser pulse that energy is stronger is controlled light path (25) through the pumping synchronizing relay, be injected in the described raman amplifier (26) as pumping pulse, the very weak transmitted beam laser pulse of energy at first enters described Raman frequency shift device (24) and carries out frequency inverted, with the laser pulse after the frequency displacement of Raman frequency shift device (24) output as seed pulse, be injected in the described raman amplifier (26) and amplify, amplified by raman amplifier (26) that chirped pulse after the frequency displacement of back output passes through first order OPCPA amplifier (27) more successively and second level OPCPA amplifier (28) carries out the energy amplification, pass through then vacuum beam-expanding system (15) expand and after picture transmits, carry out pulse compression through described vacuum compression device (16) again, finally realize the femto-second laser pulse output of superelevation peak power; Described Nd:YAG pump laser (17) carries out pumping to described broadband regeneration amplifier (20) and first order multi-pass amplifier (21), described CPA amplifier high energy pump laser (18) carries out pumping to second level multi-pass amplifier (22), and described OPCPA terminal amplifier high energy pumping source (19) carries out pumping to first order OPCPA amplifier (27) and the second level OPCPA amplifier (28) of described OPCPA terminal amplifier (14).
2. the hybrid superelevation peak power of CPA according to claim 1, CPRA and OPCPA laser pulse amplifying device, the nonlinear dielectric that it is characterized in that described first order Raman frequency shift device (24), second level raman amplifier (26) is solid dielectric or gas medium, decides according to required wavelength after the energy of incident chirped pulse and the frequency displacement.
3. the hybrid superelevation peak power femto-second laser amplifying device in conjunction with CPA, CPRA and OPCPA according to claim 1 is characterized in that the degree of regulation of described pumping synchronizing relay control light path (25) need be accurate to picosecond magnitude.
4. the hybrid superelevation peak power femto-second laser amplifying device in conjunction with CPA, CPRA and OPCPA according to claim 1 is characterized in that described first order OPCPA amplifier (27) and second level OPCPA amplifier (28) are based on the OPCPA amplifier of heavy caliber potassium dideuterium phosphate nonlinear optical crystal.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108020535A (en) * | 2017-11-29 | 2018-05-11 | 中国工程物理研究院激光聚变研究中心 | The method for measuring DKDP crystal deuterium content uniformities |
| CN111106516A (en) * | 2019-11-26 | 2020-05-05 | 深圳技术大学 | Laser amplifier |
| CN111509547A (en) * | 2020-03-27 | 2020-08-07 | 中国科学院上海光学精密机械研究所 | Ultrahigh peak power femtosecond laser cascade hybrid compression system |
| CN112484848B (en) * | 2020-12-14 | 2024-06-21 | 北京大学 | Ultrashort pulse relative peak power detection device and detection method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108020535A (en) * | 2017-11-29 | 2018-05-11 | 中国工程物理研究院激光聚变研究中心 | The method for measuring DKDP crystal deuterium content uniformities |
| CN108020535B (en) * | 2017-11-29 | 2020-03-24 | 中国工程物理研究院激光聚变研究中心 | Method for measuring deuterium content uniformity of DKDP crystal |
| CN111106516A (en) * | 2019-11-26 | 2020-05-05 | 深圳技术大学 | Laser amplifier |
| CN111509547A (en) * | 2020-03-27 | 2020-08-07 | 中国科学院上海光学精密机械研究所 | Ultrahigh peak power femtosecond laser cascade hybrid compression system |
| CN112484848B (en) * | 2020-12-14 | 2024-06-21 | 北京大学 | Ultrashort pulse relative peak power detection device and detection method thereof |
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