CN103066484A - CPA and OPCPA mixed type ultra high power femtosecond laser system - Google Patents
CPA and OPCPA mixed type ultra high power femtosecond laser system Download PDFInfo
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- CN103066484A CN103066484A CN2012105800945A CN201210580094A CN103066484A CN 103066484 A CN103066484 A CN 103066484A CN 2012105800945 A CN2012105800945 A CN 2012105800945A CN 201210580094 A CN201210580094 A CN 201210580094A CN 103066484 A CN103066484 A CN 103066484A
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Abstract
The invention provides a CPA and OPCPA mixed type ultra high power femtosecond laser system which comprises a Ti sapphire femtosecond locked mode impulse hunting device, a programmable acoustic optical modulator, a pulse broadening device, a CPA amplifer chain, an OPCPA terminal amplifier stage, an Nd:YAG pumping source, a CPA amplifier chain pumping source, an OPCPA terminal amplifier stage high-energy pumping source, a vacuum tube and a compressor, wherein pulse laser sequentially passes through the CPA amplifier chain and the OPCPA terminal amplifier stage by broadening of the pulse broadening device, and amplifier laser pulse is compressed by the compressor after transmitted by a vacuum tube image. The CPA and OPCPA mixed type ultra high power femtosecond laser system has the advantages of being high in stability, high in conversion efficiency, high in single-pass gain, free of heat effect, and free of parasitic oscillation, and achieving stable and high-efficiency IOPW stage high-power output, and even laser output of an ES (1018W) stage.
Description
Technical field
The present invention relates to high power laser system, the hybrid ultra high power fs-laser system of a kind of CPA and OPCPA particularly, described CPA is the abbreviation that chirped pulse amplifies, described OPCPA is the abbreviation that the optical parameter chirped pulse amplifies, and described ultra high power refers to that the focusing peak power of laser reaches PW(10
15W) more than.
Background technology
Since the CPA technological invention eighties, become immediately the Major Technology that improves laser system output peak power, domestic and international a plurality of Laser Experiments chamber has been carried out relevant research work in succession, the output peak power of ultrafast high power laser light obtains fast development, thereby promoted deepening continuously of the ultrafast scientific research of high field, the initial stage nineties, scientist has proposed again the OPCPA technology, because it can support wider amplification bandwidth, higher gain by one path and without advantages such as thermal effects, become very soon another study hotspot of laser science, become now acquisition ultrashort, the another mainstream technology of ultra-intense laser.
Based on the ultra high power superlaser of CPA or OPCPA technology for the mankind create unprecedented extreme physical condition, along with the lifting of Laser Focusing power density, its research field and the depth of investigation are all in continuous lifting.When Focal intensity surpasses 10
18W/cm
2Swash interaction between light and matter, main behavior by Relativistic Electron is determined, this moment, laser and matter interaction will be followed a series of phenomenon, such as: generation of the generation of the generation of x ray, r ray, relativistic self focusing, high energy electron and proton acceleration, neutron and positron etc.These new phenomenons all have potential meaning at aspects such as disclosing microcosmic rule and future source of energy, national defence.Reach 10 when focusing on peak power density
23W/cm
2Super the theory of relativity light intensity the time, the high field science will further be advanced to superpower brand-new category, open up the ultrafast science of a series of high fields the new direction in new forward position, particularly high field high-energy-density physics, explore some Basic Science Problems that correlated strategy high-tech sector that miniaturization superelevation gradient particle accelerates the ultra-intense laser field such as new principle, desk-topization high brightness X ray and matter interaction relates to.When the Laser output peak power reached the 5-10PW magnitude, Focal intensity just can reach 10
23W/cm
2, satisfy the demand of above-mentioned scientific research.
Fast development through more than 20 years, the CPA technology is relatively ripe, it has working stability, the conversion efficiency advantages of higher, development along with titanium gem crystal growing technology and Related Supporting Technologies, titanium sapphire laser system based on the CPA technology has obtained to surpass peak power 1PW near the 800nm center wave band, the output of pulse duration 30fs magnitude, but want to obtain 5-10PW magnitude and even more high-power output, just need clear aperture about 200mm so larger titanium gem crystal as amplification medium, 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, conventional titanium jewel bound edge technology is difficult to very effectively suppress the parasitic oscillation in the crystal under the high-energy pumping, suppress the more Main Bottleneck of high-energy CPA amplification output thereby become, in addition, when the crystal bore is too large, the refrigeration of the crystal relative complex that also becomes under higher repetitive frequency.Compare with the CPA technology, the working media of OPCPA technology is nonlinear optical crystal, have gain by one path high, can support to amplify and be with the advantages such as roomy, in based on heavy caliber nonlinear crystal amplification process, there is not the parasitic oscillation effect, under higher operational frequency, there is not thermal effect, as long as crystalline size can meet the demands yet, just can realize high-octane output, implement relative compact.Therefore, the output energy based on the OPCPA technology is not restricted.But high to the fine adjustment requirement of laser beam directive property and stability and time-delay based on the laser system of pure OPCPA, optical path adjusting is comparatively complicated, less stable.
Summary of the invention
The objective of the invention is to propose the hybrid ultra high power fs-laser system of a kind of CPA and OPCPA, the gain by one path of high stability, high conversion efficiency and OPCPA that this system fully combines CPA is high, without thermal effect, without the advantage of parasitic oscillation, can realize stablizing, efficiently 10PW level high-power output, even EW(10
18W) Laser output of level.
Technical solution of the present invention is as follows:
The hybrid ultra high power fs-laser system of a kind of CPA and OPCPA, be characterised in that this system is by titanium jewel femtosecond mode locking oscillator, acousto-optic modulator able to programme, stretcher, the CPA amplifier chain, the Nd:YAG pumping source, CPA amplifier chain high energy pumping source, OPCPA terminal amplifying stage, OPCPA amplifying stage high energy pumping source, vacuum filtering device and compressor reducer form, described CPA amplifier chain is successively by regenerative amplifier, the first multi-pass amplifier, the second multi-pass amplifier and the 3rd multi-pass amplifier form, described OPCPA terminal amplifying stage is successively by the first dichroic mirror, nonlinear crystal and the second dichroic mirror form, described the first dichroic mirror is high anti-to pump light, thoroughly high to the flashlight broadband, described the second dichroic mirror is thoroughly high to pump light, and is high anti-to the flashlight broadband; The position relationship of above-mentioned component is as follows:
Described acousto-optic modulator able to programme places between titanium jewel femtosecond mode locking oscillator and the pulse stretcher, the femtosecond pulse that is produced by titanium jewel femtosecond mode locking oscillator is after described acousto-optic modulator modulation able to programme, becoming full width at half maximum through described pulse stretcher broadening is the chirped pulse of 500ps～1.5ns, then pass through successively the regenerative amplifier of CPA amplifier chain, the first multi-pass amplifier, the second multi-pass amplifier and the 3rd multi-pass amplifier amplify, amplify through described OPCPA terminal amplifying stage again, after laser pulse after the amplification expands the picture transmission through the vacuum filtering device, by exporting after the described compressor compresses, described Nd:YAG pumping source carries out pumping to described regenerative amplifier and the first multi-pass amplifier, described CPA amplifier chain high energy pumping source carries out pumping to the second multi-pass amplifier and the 3rd multi-pass amplifier, described OPCPA amplifying stage high energy pumping source imports on the nonlinear crystal by the first dichroic mirror, and described OPCPA terminal amplifying stage is carried out pumping.
Described nonlinear crystal is that bore is the three lithium borate (LiB of 10cm～15cm
3O
5, be designated hereinafter simply as LBO), three boracic acid oxygen calcium yttrium (YCa
4O (BO
3)
3, be designated hereinafter simply as YCOB) or potassium dideuterium phosphate (being designated hereinafter simply as DKDP) crystal, the cutting angle of crystal by pump light and signal light wavelength in crystal, satisfy phase matched condition (
K wherein
p=2 π n
p/ λ
p, k
s=2 π n
s/ λ
s, k
i=2 π n
i/ λ
i, λ
pAnd n
pDifference pumping light wavelength and refractive index, λ
sAnd n
sRespectively signal light wavelength and refractive index, λ
iAnd n
iBe respectively ideler frequency light wavelength and refractive index, satisfy 1/ λ
p=1/ λ
s+ 1/ λ
i) determine, crystal is fixed on the sextuple accurate adjustment rack.
Described the first dichroic mirror has rotation and aligning elevation gear.
Described CPA amplifier chain high energy pumping source is that pulsewidth is the neodymium glass laser system of 20ns, successively by 1053nm single longitudinal mode continuous laser seed source, Pockers cell, regenerative amplifier, the neodymium glass amplifier chain, frequency multiplier, the 20%:80% spectroscope, the 50%:50% spectroscope, high reflective mirror and signal of telecommunication synchronizing relay controller form, it is the laser pulse of 20ns that the continuous laser slicing that Pockers cell produces 1053nm single longitudinal mode continuous laser seed source becomes pulsewidth, after laser pulse process regenerative amplifier and neodymium glass amplifier chain amplify, pass through again the frequency multiplier frequency multiplication, output wavelength is that the 527nm single pulse energy is the High Power Laser Pulses of 110J～150J, laser pulse is reflected through 20% pulse energy after the light splitting of 20%:80% spectroscope again, be divided into two bundles through the 50%:50% spectroscope again, from both-end pumping the second multi-pass amplifier, 80% pulse energy is transmitted, be divided into two bundles through the 50%:50% spectroscope again, from both-end pumping the 3rd multi-pass amplifier, signal of telecommunication synchronizing relay controller in time precision is controlled the synchronous of pumping light pulse and signal pulse.
Described OPCPA amplifying stage high energy pumping source is the neodymium glass laser system of short pulse duration 2～3ns, this system comprises single longitudinal mode continuous laser seed source, the fiber strength modulator, regenerative amplifier, the neodymium glass amplifier chain, frequency multiplier and signal of telecommunication synchronizing relay controller, it is the laser pulse of 2ns～3ns that the continuous laser slicing that the fiber strength modulator produces 1053nm single longitudinal mode continuous laser seed source becomes pulsewidth, after laser pulse process regenerative amplifier and neodymium glass amplifier chain amplify, pass through again the frequency multiplier frequency multiplication, output wavelength is that the 527nm single pulse energy is the High Power Laser Pulses of 1500J-2500J, the control pumping light pulse of signal of telecommunication synchronizing relay controller and signal pulse precision synchronous in time.
The present invention has following technique effect:
The present invention is based on the hybrid 5-10 of CPA and OPCPA and clap watt level ultra high power fs-laser system, take the CPA amplifier chain as the front end amplifying stage, the OPCPA amplifier is the terminal amplifying stage, overcome original high power laser system based on titanium jewel CPA technology because parasitic oscillation causes 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 gain by one path of high conversion efficiency and OPCPA is high, without thermal effect, advantage without parasitic oscillation, not only can realize the amplification output of 300J-500J, and keep injecting preferably the spectral characteristic of light beam.Behind the final injection compressor reducer, the compression efficiency with 60% is calculated, and can obtain the ultra-intense laser pulse of 150J-300J, pulsewidth 25fs-30fs after the compression, and corresponding peak power is 5-10PW.Whole system has compact conformation, and the high advantage of stability can be applied to have the key areas of important scientific meaning and strategic high technology innovation.
Technical scheme of the present invention goes for the different operating wave band, need only select as required the different operating medium to get final product.
Technical scheme of the present invention is not only applicable to the laser system of 5-10PW, is applicable to the output of high-magnitude more and even EW yet.
Description of drawings
Fig. 1 is the structural representation of CPA and the hybrid ultra high power fs-laser system of OPCPA
Fig. 2 is the structural representation of CPA amplifier chain high energy pumping source
Fig. 3 is the structural representation of OPCPA amplifying stage high energy pumping source
Embodiment
Fig. 1 is the structural representation of CPA of the present invention and the hybrid ultra high power fs-laser system of OPCPA, as seen from the figure, the hybrid ultra high power fs-laser system of CPA of the present invention and OPCPA comprises titanium jewel femtosecond mode locking oscillator 1, acousto-optic modulator 2 able to programme, stretcher 3, CPA amplifier chain 4, Nd:YAG pumping source 5, CPA amplifier chain high energy pumping source 6, OPCPA terminal amplifying stage 7, OPCPA amplifying stage high energy pumping source 8, vacuum filtering device 12 and compressor reducer 13, wherein said CPA amplifier chain 4 comprises a regenerative amplifier 14, the first multi-pass amplifier 15, the second multi-pass amplifier 16 and the 3rd multi-pass amplifier 17, described OPCPA terminal amplifying stage 7 comprises the first dichroic mirror 9, nonlinear crystal 10 and the second dichroic mirror 11,9 pairs of pump lights of described the first dichroic mirror are high anti-, thoroughly high to the flashlight broadband, 11 pairs of pump lights of described the second dichroic mirror are thoroughly high, and are high anti-to the flashlight broadband; The position relationship of above-mentioned component is as follows: described acousto-optic modulator 2 able to programme places between titanium jewel femtosecond mode locking oscillator 1 and the pulse stretcher 3, pulse laser is through amplifying by CPA amplifier chain 4 and OPCPA terminal amplifying stage 4 successively behind described pulse stretcher 3 broadenings, after laser pulse after the amplification transmits through vacuum filtering device 12 pictures, by output after described compressor reducer 13 compressions, 5 pairs of described regenerative amplifiers 14 of described Nd:YAG pumping source and the first multi-pass amplifier 15 carry out pumping, 6 pairs of the second multi-pass amplifiers 16 of described CPA amplifier chain high energy pumping source and the 3rd multi-pass amplifier 17 carry out pumping, described OPCPA amplifying stage high energy pumping source 8 imports on the nonlinear crystal 10 by the first dichroic mirror 9, and described OPCPA terminal amplifying stage 7 is carried out pumping;
Described titanium jewel mode locking pulse oscillator 1 is commercial titanium jewel femtosecond oscillator, and the output center wave band is the ultrashort pulse sequence of the 10fs-12fs of 800nm;
Described stretcher 3 is general Offner structure stretcher (Offner stretcher curved mirror error is on the impact of output pulse contrast, Acta Optica, vol.28,1584-1589);
Described CPA amplifier chain 4 is comprised of a regenerative amplifier 14, the first multi-pass amplifier 15, the second multi-pass amplifier 16 and the 3rd multi-pass amplifier 17, and working media is titanium gem crystal.The single pulse energy of laser pulse output after described regenerative amplifier 14 amplifies is 5-8mJ, repetition rate 10Hz, can export the laser pulse of 50J-60J after follow-up the first multi-pass amplifier 15, the second multi-pass amplifier 16 and the 3rd multi-pass amplifier 17 amplify, final repetition rate is determined by described high energy CPA pumping source 6.When titanium gem crystal trans D during obviously greater than longitudinal thickness, need to adopt parasitic oscillation to suppress technology [patent: ZL200710039733.6], to guarantee high efficiency amplification output, the amplifier crystal of high repetition frequency work need adopt relevant Refrigeration Technique [patent: ZL01237826.7] simultaneously;
Described regenerative amplifier 14 and the first multi-pass amplifier 15 are to provide pumping by two Nd:YAG pumping sources 5, and about every Nd:YAG pumping source output single pulse energy 1J, pulsewidth is 9ns approximately, and repetition rate is 10Hz;
Described CPA amplifier chain high energy pumping source 6 is the neodymium glass laser system of pulsewidth about 20ns, successively by 1053nm single longitudinal mode continuous laser seed source 18, Pockers cell 19, regenerative amplifier 20, neodymium glass amplifier chain 21, frequency multiplier 22,20%:80% spectroscope 23,50%:50% spectroscope 24, high reflective mirror 25 and signal of telecommunication synchronizing relay controller 26 form, it is the laser pulse of 20ns that the continuous laser slicing that Pockers cell 19 produces 1053nm single longitudinal mode continuous laser seed source 18 becomes pulsewidth, after laser pulse process regenerative amplifier 20 and neodymium glass amplifier chain 21 amplify, pass through again frequency multiplier 22 frequencys multiplication, output wavelength is that the 527nm single pulse energy is the High Power Laser Pulses of 110J-150J, laser pulse is reflected through 20% pulse energy after 23 light splitting of 20%:80% spectroscope again, be divided into two bundles through 50%:50% spectroscope 24 again, from both-end pumping the second multi-pass amplifier 16,80% pulse energy is transmitted, be divided into two bundles through 50%:50% spectroscope 24 again, from both-end pumping the 3rd multi-pass amplifier 17, signal of telecommunication synchronizing relay controller 26 in time precision is controlled the synchronous of pumping light pulse and signal pulse;
Described OPCPA terminal amplifying stage 7 is comprised of the first dichroic mirror 9, nonlinear crystal 10 and the second dichroic mirror 11 successively, 9 pairs of pump lights of the first dichroic mirror are high anti-, thoroughly high to the flashlight broadband, 11 pairs of pump lights of the second dichroic mirror are thoroughly high, high anti-to the flashlight broadband, just can regulate pump light and flashlight at intracrystalline angle by the deflection angle of regulating the first dichroic mirror 9;
The hybrid ultra high power fs-laser system of CPA according to claim 1 and OPCPA is characterized in that described nonlinear crystal (10) is the LBO(LiB of 10cm～15cm for bore
3O
5Three lithium borates), YCOB(YCa
4O (BO
3)
3Three boracic acid oxygen calcium yttriums) or the DKDP(potassium dideuterium phosphate) crystal, the cutting angle of crystal by pump light and signal light wavelength in crystal, satisfy phase matched condition (
K wherein
p=2 π n
p/ λ
p, k
s=2 π n
s/ λ
s, k
i=2 π n
i/ λ
i, λ
pAnd n
pDifference pumping light wavelength and refractive index, λ
sAnd n
sRespectively signal light wavelength and refractive index, λ
iAnd n
iBe respectively ideler frequency light wavelength and refractive index, satisfy 1/ λ
p=1/ λ
s+ 1/ λ
i) determine, crystal is fixed on the accurate adjustment rack of 6 dimensions;
Described OPCPA amplifying stage high energy pumping source is the neodymium glass laser system of short pulse duration 2-3ns, this system comprises single longitudinal mode continuous laser seed source 18, fiber strength modulator 27, regenerative amplifier 20, neodymium glass amplifier chain 21, frequency multiplier 22 and signal of telecommunication synchronizing relay controller 26, it is the laser pulse of 2ns-3ns that the continuous laser slicing that fiber strength modulator 27 produces 1053nm single longitudinal mode continuous laser seed source 18 becomes pulsewidth, after laser pulse process regenerative amplifier 20 and neodymium glass amplifier chain 21 amplify, pass through again frequency multiplier 22 frequencys multiplication, output wavelength is that the 527nm single pulse energy is the High Power Laser Pulses of 1500J-2500J, signal of telecommunication synchronizing relay controller 26 control pumping light pulse and signal pulse precision synchronous in time.
As mentioned above, the course of work of system of the present invention is as follows:
Titanium jewel femtosecond mode locking pulse oscillator 1 produces the ultrashort pulse sequence of 800nm wave band ~ 10fs, be injected in the stretcher 3 through acousto-optic modulator 2 able to programme, it is the Broadband Chirped Pulse of 500ps-1.5ns that the mode locking pulse sequence broadening of stretcher 3 general ~ 10fs becomes full width at half maximum, then be input to and carry out the energy amplification in regenerative amplifier 14 and first multi-pass amplifier 15,2 10Hz Nd:YAG pumping sources 5 provide pumping for regenerative amplifier 14 and first multi-pass amplifier 15, after first multi-pass amplifier 15 amplifications, the laser pulse of 300mJ-350mJ is injected in second multi-pass amplifier 16 and the 3rd multi-pass amplifier 17, optical pulse energy is 50J-60J after amplifying, CPA amplifier chain high energy pumping source 6 is several 130J-150J527nm high energy pumping of 20ns for second multi-pass amplifier 16 and the 3rd multi-pass amplifier 17 provide pulsewidth, 9 transmissions are injected on the heavy caliber nonlinear crystal YCOB10 high energy chirped pulse after CPA amplifier chain 4 amplifies through the first dichroic mirror, the pulsewidth that OPCPA amplifying stage high energy pumping source 8 provides is that 2-3ns high energy 527nm pump light is through dichroic mirror 9 reflections, becoming the exterior angle with high energy 800nm broadband signal light is that 4.84 ° of nonlinear angles incide on the nonlinear crystal YCOB10, YCOB10 is according to the I class non-colinear phase matched angle cutting of satisfying 527nm pump light and 800nm flashlight, cutting angle is 26.5 °, amplify 800nm broadband signal light so that produce the OPCPA process, the second dichroic mirror 11 so that 800nm broadband signal light height the 527nm pump light is high thoroughly on the contrary, 800nm broadband signal light is separated from the 527nm pump light, 800nm broadband signal light after vacuum filtering device 12 amplifies OPCPA expands to the grating damage threshold of energy density less than compressor reducer 13, and picture is delivered on the compressor reducer 13, the high energy signal light of 13 pairs of inputs of compressor reducer compresses, it is compressed to tens femtoseconds by nanosecond order, produces the output of ultrashort, super strong laser pulse.
The hybrid ultra high power fs-laser system of above-mentioned CPA and OPCPA, concrete job step can be summarized as follows:
(1) titanium jewel femtosecond mode locking pulse oscillator 1 produces the ultrashort pulse sequence of the 10fs-12fs of 800nm wave band, and the spectrum overall with is about 150nm-200nm;
(2) ultrashort pulse sequence is injected in the stretcher 3 through behind the acousto-optic modulator 2 able to programme, and stretcher 3 becomes ultra-short pulse-width expansion the chirped pulse of hundreds of psec or nanosecond order;
(4) chirped pulse behind the broadening is injected into and carries out the energy amplification in regenerative amplifier 14 and first multi-pass amplifier 15,2 10Hz Nd:YAG lasers provide pumping for regenerative amplifier 14 and first multi-pass amplifier 15, the first multi-pass amplifier 15 is the five-way amplifier of both-end pumping, and to take corresponding Refrigeration Technique, the pulsed laser energy after the amplification be 300mJ-350mJ;
(5) second multi-pass amplifiers 16 are four-way amplifier, gain media is the titanium jewel of Φ 40mm bore, the 3rd multi-pass amplifier 17 is the threeway amplifier, gain media is Φ 100mm titanium jewel, adopt matching fluid to add carbon dust and suppress horizontal parasitic oscillation problem, CPA amplifier chain high energy pumping source 6 is by light-dividing device antireflection part light (20%) both-end pumping the second multi-pass amplifier 16, residual pump light (80%) both-end pumping the 3rd multi-pass amplifier 17, after two-stage multi-pass amplifier 16,17 amplified, the flashlight energy was five or six ten joules;
9 pairs of 527nm pump light reflections of (6) first dichroic mirrors, the transmission of 800nm broadband signal light, the pump light of OPCPA amplifying stage high energy pumping source 8 after frequency multiplication is by dichroic mirror 9 reflections, incide on the nonlinear crystal YCOB10 with the outer angle of 4.85 ° of non-colinears with 800nm broadband signal light, the cutting angle of nonlinear crystal YCOB10 is θ=26.5 °
(or 0 °) satisfies the phase matched of 527nm pumping 800nm broadband OPCPA;
(7) deflection and the pitching deflection of adjusting the first dichroic mirror 9 can be regulated pump light and the signal angle in nonlinear crystal 10;
(8) nonlinear crystal YCOB10 is fixed on the 6 dimension adjusting crystal frames, by regulating crystal frame so that pump light and flashlight satisfy phase matching angle incident at crystal, thereby the spectrum width of the flashlight after guaranteeing to amplify is the widest, amplification efficiency is the highest, and the pump light after the amplification separates by dichroic mirror 11 with signal;
(9) flashlight after the reflection expands by vacuum filtering device 12 and the picture transmission, so that the energy density of the flashlight after expanding is less than the damage threshold of compressor reducer 13 the inside gratings, the compressed device 13 of light beam that picture is delivered to compressor reducer 13 is compressed to tens femtoseconds, produces superpower ultra high power femto-second laser pulse.
It is that terminal is amplified the hybrid combination 5-10PW fs-laser system that combines with OPCPA that the present invention proposes the CPA front end, the gain by one path of high stability, high conversion efficiency and OPCPA that fully combines CPA is high, without thermal effect, without the advantage of parasitic oscillation, after the CPA front end is realized near the amplification output of the tens of joules of magnitudes of center wave band 800nm, be injected in the OPCPA amplifier based on nonlinear crystal, carrying out high-energy amplifies, the OPCPA that not only can realize 300J-500J amplifies output, and keeps injecting preferably the spectral characteristic of light beam.Behind the final injection compressor reducer, the compression efficiency with 60% is calculated, and can obtain the ultra-intense laser pulse of 150J-300J, pulsewidth 25fs-30fs after the compression, corresponding peak power 5-10PW.Whole system has compact conformation, the advantage that stability is high.Technical scheme of the present invention is not only applicable to the laser system of 5-10PW, is applicable to the output of high-magnitude more and even EW yet.
Claims (5)
1. a CPA and the hybrid ultra high power fs-laser system of OPCPA, be characterised in that this system is by titanium jewel femtosecond mode locking oscillator (1), acousto-optic modulator able to programme (2), stretcher (3), CPA amplifier chain (4), Nd:YAG pumping source (5), CPA amplifier chain high energy pumping source (6), OPCPA terminal amplifying stage (7), OPCPA amplifying stage high energy pumping source (8), vacuum filtering device (12) and compressor reducer (13) form, described CPA amplifier chain (4) is successively by regenerative amplifier (14), the first multi-pass amplifier (15), the second multi-pass amplifier (16) and the 3rd multi-pass amplifier (17) form, described OPCPA terminal amplifying stage (7) is successively by the first dichroic mirror (9), nonlinear crystal (10) and the second dichroic mirror (11) form, described the first dichroic mirror (9) is high anti-to pump light, thoroughly high to the flashlight broadband, described the second dichroic mirror (11) is thoroughly high to pump light, and is high anti-to the flashlight broadband; The position relationship of above-mentioned component is as follows:
Described acousto-optic modulator able to programme (2) places between titanium jewel femtosecond mode locking oscillator (1) and the pulse stretcher (3), the femtosecond pulse that is produced by titanium jewel femtosecond mode locking oscillator (1) is after described acousto-optic modulator able to programme (2) modulation, becoming full width at half maximum through described pulse stretcher (3) broadening is the chirped pulse of 500ps～1.5ns, then pass through successively the regenerative amplifier (14) of CPA amplifier chain (4), the first multi-pass amplifier (15), the second multi-pass amplifier (16) and the 3rd multi-pass amplifier (17) amplify, amplify through described OPCPA terminal amplifying stage (7) again, after laser pulse after the amplification expands the picture transmission through vacuum filtering device (12), by output after described compressor reducer (13) compression, described Nd:YAG pumping source (5) carries out pumping to described regenerative amplifier (14) and the first multi-pass amplifier (15), described CPA amplifier chain high energy pumping source (6) carries out pumping to the second multi-pass amplifier (16) and the 3rd multi-pass amplifier (17), described OPCPA amplifying stage high energy pumping source (8) imports on the nonlinear crystal (10) by the first dichroic mirror (9), and described OPCPA terminal amplifying stage (7) is carried out pumping.
2. the hybrid ultra high power fs-laser system of CPA according to claim 1 and OPCPA, it is characterized in that described nonlinear crystal (10) is three lithium borates, three boracic acid oxygen calcium yttriums or the potassium dideuterium-hydrogen phosphate crystal of 10cm～15cm for bore, the cutting angle of crystal is satisfied the condition of phase matched in crystal by pump light and signal light wavelength
K wherein
p=2 π n
p/ λ
p, k
s=2 π n
s/ λ
s, k
i=2 π n
i/ λ
i, λ
pAnd n
pDifference pumping light wavelength and refractive index, λ
sAnd n
sRespectively signal light wavelength and refractive index, λ
iAnd n
iBe respectively ideler frequency light wavelength and refractive index, satisfy 1/ λ
p=1/ λ
s+ 1/ λ
iDetermine, crystal is fixed on the sextuple accurate adjustment rack.
3. the hybrid ultra high power fs-laser system of CPA according to claim 1 and OPCPA is characterized in that described the first dichroic mirror (9) has rotation and aligning elevation gear.
4. the hybrid ultra high power fs-laser system of CPA according to claim 1 and OPCPA, it is characterized in that described CPA amplifier chain high energy pumping source (6) is the neodymium glass laser system of 20ns for pulsewidth, successively by 1053nm single longitudinal mode continuous laser seed source (18), Pockers cell (19), regenerative amplifier (20), neodymium glass amplifier chain (21), frequency multiplier (22), 20%:80% spectroscope (23), 50%:50% spectroscope (24), three high reflective mirrors (25) and signal of telecommunication synchronizing relay controller (26) form, it is the laser pulse of 20ns that the continuous laser slicing that Pockers cell (19) produces 1053nm single longitudinal mode continuous laser seed source (18) becomes pulsewidth, after laser pulse process regenerative amplifier (20) and neodymium glass amplifier chain (21) amplify, pass through again frequency multiplier (22) frequency multiplication, output wavelength is that the 527nm single pulse energy is the High Power Laser Pulses of 110J～150J, laser pulse passes through after 20%:80% spectroscope (23) light splitting 20% pulse energy again and is reflected, pass through again 50%:50% spectroscope (24) and be divided into two bundles, from both-end pumping the second multi-pass amplifier (16), 80% pulse energy is transmitted, pass through again 50%:50% spectroscope (24) and be divided into two bundles, from both-end pumping the 3rd multi-pass amplifier (17), signal of telecommunication synchronizing relay controller (26) in time precision is controlled the synchronous of pumping light pulse and signal pulse.
5. according to claim 1 to 4 each described CPA and the hybrid ultra high power fs-laser system of OPCPA, it is characterized in that described OPCPA amplifying stage high energy pumping source (8) is the neodymium glass laser system of short pulse duration 2～3ns, this system comprises single longitudinal mode continuous laser seed source (18), fiber strength modulator (27), regenerative amplifier (20), neodymium glass amplifier chain (21), frequency multiplier (22) and signal of telecommunication synchronizing relay controller (26), it is the laser pulse of 2ns～3ns that the continuous laser slicing that fiber strength modulator (27) produces 1053nm single longitudinal mode continuous laser seed source (18) becomes pulsewidth, after laser pulse process regenerative amplifier (20) and neodymium glass amplifier chain (21) amplify, pass through again frequency multiplier (22) frequency multiplication, output wavelength is that the 527nm single pulse energy is the High Power Laser Pulses of 1500J-2500J, signal of telecommunication synchronizing relay controller (26) control pumping light pulse and signal pulse precision synchronous in time.
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| CN2012105800945A Pending CN103066484A (en) | 2012-12-27 | 2012-12-27 | CPA and OPCPA mixed type ultra high power femtosecond laser system |
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| CN103926779A (en) * | 2014-01-21 | 2014-07-16 | 中国科学院上海光学精密机械研究所 | High-contrast chirped pulse amplification device |
| CN105161965A (en) * | 2015-10-12 | 2015-12-16 | 哈尔滨工业大学 | Large-aperture crystal frequency-doubling conversion device realizing frequency conversion and light beam focusing |
| CN105720474A (en) * | 2014-12-05 | 2016-06-29 | 中国科学院上海光学精密机械研究所 | Subtend compression chirped pulse amplification laser system |
| CN105790061A (en) * | 2014-12-22 | 2016-07-20 | 中国科学院上海光学精密机械研究所 | Dual-injection OPCPA coherent beam combination ultra-high power laser system |
| CN110112644A (en) * | 2019-04-29 | 2019-08-09 | 华中科技大学 | A kind of high-energy lacks period optical parameter amplification method and device |
| CN111091989A (en) * | 2020-03-23 | 2020-05-01 | 北京波量科技有限公司 | High-field laser laboratory safety interlocking device and control method thereof |
| CN112859479A (en) * | 2021-02-02 | 2021-05-28 | 中国科学院上海光学精密机械研究所 | Method for improving broadband OPCPA performance by full-three-dimensional spatial phase matching |
| CN113097839A (en) * | 2021-03-30 | 2021-07-09 | 北京大学 | Laser amplification system protection device and protection method thereof |
| CN117154526A (en) * | 2023-10-31 | 2023-12-01 | 北京卓镭激光技术有限公司 | Hundred picosecond laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926779A (en) * | 2014-01-21 | 2014-07-16 | 中国科学院上海光学精密机械研究所 | High-contrast chirped pulse amplification device |
| CN105720474B (en) * | 2014-12-05 | 2019-06-18 | 中国科学院上海光学精密机械研究所 | Opposite direction compression Chirp pulse amplification laser system |
| CN105720474A (en) * | 2014-12-05 | 2016-06-29 | 中国科学院上海光学精密机械研究所 | Subtend compression chirped pulse amplification laser system |
| CN105790061A (en) * | 2014-12-22 | 2016-07-20 | 中国科学院上海光学精密机械研究所 | Dual-injection OPCPA coherent beam combination ultra-high power laser system |
| CN105790061B (en) * | 2014-12-22 | 2019-06-18 | 中国科学院上海光学精密机械研究所 | Dual Implantations OPCPA coherent beam combination ultra high power laser system |
| CN105161965B (en) * | 2015-10-12 | 2018-03-27 | 哈尔滨工业大学 | A kind of heavy caliber crystal double frequency conversion equipment for realizing frequency conversion and light beam focusing |
| CN105161965A (en) * | 2015-10-12 | 2015-12-16 | 哈尔滨工业大学 | Large-aperture crystal frequency-doubling conversion device realizing frequency conversion and light beam focusing |
| CN110112644A (en) * | 2019-04-29 | 2019-08-09 | 华中科技大学 | A kind of high-energy lacks period optical parameter amplification method and device |
| CN111091989A (en) * | 2020-03-23 | 2020-05-01 | 北京波量科技有限公司 | High-field laser laboratory safety interlocking device and control method thereof |
| CN111091989B (en) * | 2020-03-23 | 2020-06-26 | 北京波量科技有限公司 | High-field laser laboratory safety interlocking device and control method thereof |
| CN112859479A (en) * | 2021-02-02 | 2021-05-28 | 中国科学院上海光学精密机械研究所 | Method for improving broadband OPCPA performance by full-three-dimensional spatial phase matching |
| CN113097839A (en) * | 2021-03-30 | 2021-07-09 | 北京大学 | Laser amplification system protection device and protection method thereof |
| CN117154526A (en) * | 2023-10-31 | 2023-12-01 | 北京卓镭激光技术有限公司 | Hundred picosecond laser |
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