Tsis ntev los no, lub koom haum ntawm Applied Physics ntawm Lavxias teb sab Academy ntawm Sciences qhia lub eXawatt Center rau Extreme Light Study (XCELS), ib tug kev tshawb fawb kev pab cuam rau loj scientific pab kiag li lawm raws li tsis tshua muaj neeg.siab zog lasers. Qhov project muaj xws li kev tsim kho ntawm ib tug heevsiab zog laserRaws li optical parametric chirped mem tes amplification technology nyob rau hauv loj aperture potassium dideuterium phosphate (DKDP, chemical formula KD2PO4) crystals, nrog rau qhov kev cia siab tag nrho cov zis ntawm 600 PW ncov lub zog pulses. Txoj haujlwm no muab cov ntsiab lus tseem ceeb thiab kev tshawb fawb tshawb pom txog XCELS qhov project thiab nws cov tshuab laser, piav qhia txog cov ntawv thov thiab cov kev cuam tshuam cuam tshuam txog kev sib cuam tshuam ntawm lub teeb pom kev zoo.
Qhov kev pab cuam XCELS tau npaj rau xyoo 2011 nrog rau lub hom phiaj pib ntawm kev ua tiav lub zog siab tshaj plawslaserpulse tso zis ntawm 200 PW, uas tam sim no hloov kho mus rau 600 PW. Nwslaser systemtso siab rau peb lub tswv yim tseem ceeb:
(1) Optical Parametric Chirped Pulse Amplification (OPCPA) thev naus laus zis yog siv los hloov cov tsoos Chirped Pulse Amplification (Chirped Pulse Amplification, OPCPA). CPA) technology;
(2) Siv DKDP raws li qhov nce nruab nrab, ultra wideband theem sib piv tau pom nyob ze 910 nm wavelength;
(3) Lub aperture loj neodymium iav laser nrog lub zog pulse ntawm ntau txhiab joules yog siv los tso lub parametric amplifier.
Ultra-wideband theem sib piv yog dav pom nyob rau hauv ntau cov muaju thiab yog siv nyob rau hauv OPCPA femtosecond lasers. DKDP crystals yog siv vim tias lawv tsuas yog cov khoom siv pom nyob rau hauv kev xyaum uas tuaj yeem loj hlob mus rau kaum tawm centimeters ntawm qhov aperture thiab tib lub sijhawm muaj qhov zoo ntawm optical zoo los txhawb kev nthuav dav ntawm ntau lub zog PW.lasers. Nws pom tau tias thaum DKDP siv lead ua yog siv los ntawm ob zaus lub teeb ntawm ND iav laser, yog tias cov cab kuj wavelength ntawm amplified mem tes yog 910 nm, thawj peb nqe lus ntawm Taylor expansion ntawm yoj vector mismatch yog 0.
Daim duab 1 yog schematic layout ntawm XCELS laser system. Lub hauv ntej kawg generated chirped femtosecond pulses nrog lub nruab nrab wavelength ntawm 910 nm (1.3 hauv daim duab 1) thiab 1054 nm nanosecond pulses txhaj rau hauv OPCPA pumped laser (1.1 thiab 1.2 hauv daim duab 1). Lub hauv ntej kawg kuj ua kom lub synchronization ntawm cov pulses nrog rau qhov yuav tsum tau lub zog thiab spatiotemporal tsis. Qhov nruab nrab OPCPA kev khiav hauj lwm ntawm qhov kev rov ua dua siab dua (1 Hz) ua kom lub zog ntawm chirped mem tes mus rau kaum ntawm joules (2 hauv daim duab 1). Lub pulse yog txuas ntxiv los ntawm Booster OPCPA rau hauv ib lub kilojoule beam thiab muab faib ua 12 zoo tib yam sub-beams (4 hauv daim duab 1). Hauv qhov kawg 12 OPCPA, txhua qhov ntawm 12 chirped lub teeb pulses yog amplified mus rau qib kilojoule (5 hauv daim duab 1) thiab ces compressed los ntawm 12 compression gratings (GC ntawm 6 hauv daim duab 1). Lub acousto-optic programmable dispersion lim yog siv nyob rau hauv pem hauv ntej kawg kom meej tswj pab pawg neeg tshaj tawm dispersion thiab siab txiav txim dispersion, thiaj li yuav tau txais qhov tsawg tshaj plaws mem tes dav. Lub pulse spectrum muaj ib tug zoo li ntawm ze li ntawm 12th-kev txiav txim supergauss, thiab spectral bandwidth ntawm 1% ntawm tus nqi siab tshaj plaws yog 150 nm, sib xws rau Fourier transform txwv pulse dav ntawm 17 fs. Xav txog cov nyiaj them tsis tiav dispersion thiab qhov nyuaj ntawm nonlinear theem them nyiaj nyob rau hauv parametric amplifiers, qhov xav tau mem tes dav yog 20 fs.
XCELS laser yuav ntiav ob 8-channel UFL-2M neodymium iav laser zaus ob chav modules (3 nyob rau hauv daim duab 1), ntawm uas 13 raws yuav siv los tso lub Booster OPCPA thiab 12 kawg OPCPA. Cov seem peb channel yuav raug siv ua ywj siab nanosecond kilojoule pulsedlaser qhov chawrau lwm yam kev sim. Kev txwv los ntawm qhov pib tawg ntawm qhov muag pom ntawm DKDP siv lead ua, irradiation siv ntawm cov mem tes twj tso kua mis yog teem rau 1.5 GW / cm2 rau txhua channel thiab lub sijhawm ntev yog 3.5 ns.
Txhua channel ntawm XCELS laser tsim pulses nrog lub zog ntawm 50 PW. Tag nrho ntawm 12 channel muab tag nrho cov zis hluav taws xob ntawm 600 PW. Nyob rau hauv lub hom phiaj tseem ceeb chamber, lub siab tshaj plaws tsom siv ntawm txhua channel nyob rau hauv zoo tagnrho tej yam kev mob yog 0.44 × 1025 W / cm2, piv txwv li hais tias F / 1 tsom xam yog siv rau tsom. Yog hais tias lub mem tes ntawm txhua channel txuas ntxiv mus rau 2.6 fs los ntawm cov txheej txheem tom qab compression, cov khoom siv hluav taws xob sib txuas yuav raug nce mus rau 230 PW, sib haum rau lub teeb siv ntawm 2.0 × 1025 W / cm2.
Txhawm rau kom ua tiav lub teeb ci ntau dua, ntawm 600 PW tso zis, lub teeb pulses nyob rau hauv 12 raws yuav raug tsom rau hauv cov duab hluav taws xob ntawm inverse dipole hluav taws xob, raws li pom hauv daim duab 2. Thaum lub sijhawm pulse nyob rau hauv txhua lub channel tsis kaw, qhov kev siv lub ntsej muag muaj peev xwm. mus txog 9 × 1025 W / cm2. Yog tias txhua theem mem tes raug kaw thiab synchronized, qhov sib xyaw ua ke ntawm lub teeb ci yuav raug nce mus rau 3.2 × 1026 W / cm2. Ntxiv rau lub hom phiaj tseem ceeb ntawm chav tsev, XCELS qhov project suav nrog txog li 10 lub chaw kuaj neeg siv, txhua tus tau txais ib lossis ntau kab rau kev sim. Siv lub teeb pom kev zoo no, XCELS qhov phiaj xwm npaj ua cov kev sim hauv plaub pawg: cov txheej txheem quantum electrodynamics hauv cov laser khaus; Kev tsim thiab acceleration ntawm cov khoom; Lub tiam thib ob electromagnetic tawg; Laboratory astrophysics, siab zog ceev txheej txheem thiab kev tshawb fawb kuaj.
FIG. 2 tsom geometry nyob rau hauv lub ntsiab lub hom phiaj chamber. Txhawm rau kom pom tseeb, daim iav parabolic ntawm beam 6 tau teeb tsa kom pob tshab, thiab cov kab tawm tswv yim thiab cov khoom tso tawm pom tsuas yog ob txoj kab 1 thiab 7.
Daim duab 3 qhia qhov spatial layout ntawm txhua qhov chaw ua haujlwm ntawm XCELS laser system hauv lub tsev sim. Hluav taws xob, lub tshuab nqus tsev twj, kev kho dej, ntxuav thiab cua txias yog nyob rau hauv qab daus. Tag nrho cheeb tsam kev tsim kho yog ntau tshaj 24,000 m2. Tag nrho lub zog siv yog li 7.5 MW. Lub tsev sim muaj ib qho kev sab hauv hollow tag nrho cov thav duab thiab ib seem sab nraud, txhua tus ua rau ntawm ob lub hauv paus decoupled. Lub tshuab nqus tsev vacuum thiab lwm yam kev vibration-inducing systems tau nruab rau ntawm lub hauv paus kev co-kev sib cais, kom lub amplitude ntawm kev cuam tshuam xa mus rau lub laser system los ntawm lub hauv paus thiab kev txhawb nqa raug txo kom tsawg dua 10-10 g2 / Hz nyob rau hauv ntau zaus ntawm 1-200 Hz. Tsis tas li ntawd, lub network ntawm geodesic reference markers yog teem rau hauv lub laser nrog systematically saib xyuas lub drift ntawm av thiab khoom siv.
Txoj haujlwm XCELS lub hom phiaj los tsim qhov chaw tshawb fawb loj loj raws li lub zog siab tshaj plaws lasers. Ib txoj hauv kev ntawm XCELS laser system tuaj yeem muab lub teeb tsom pom kev siv ntau zaus ntau dua 1024 W / cm2, uas tuaj yeem ua tau ntau dua los ntawm 1025 W / cm2 nrog kev siv tshuab tom qab compression. Los ntawm dipole-focusing pulses los ntawm 12 raws nyob rau hauv lub laser system, ib qho kev siv ze rau 1026 W / cm2 yuav ua tau tiav txawm tsis muaj post-compression thiab theem locking. Yog tias cov theem synchronization ntawm cov channel raug kaw, lub teeb siv yuav ntau dua. Siv cov ntaub ntawv no-tawg pulse intensities thiab ntau-channel beam layout, yav tom ntej XCELS chaw yuav muaj peev xwm ua thwmsim nrog tsis tshua muaj siab siv, complex teeb pom kev zoo teb, thiab tshuaj ntsuam xyuas kev sib cuam tshuam siv multi-channel laser beams thiab lwm yam hluav taws xob hluav taws xob. Qhov no yuav ua lub luag haujlwm tshwj xeeb hauv thaj tsam ntawm super-muaj zog electromagnetic teb sim physics.
Post lub sij hawm: Mar-26-2024