Guqula isantya sokubetha kwentliziyoi-laser enamandla kakhulu ye-ultrashort
Iilaser ezimfutshane kakhulu ezimfutshane ngokubanzi zibhekisa kwiipulse ze-laser ezinobubanzi be-pulse yamashumi kunye namakhulu ee-femtoseconds, amandla aphezulu e-terawatts kunye neepetawatts, kunye nokukhanya kwazo okugxilwe kuko kudlula i-1018 W/cm2. I-laser ultra-short laser kunye nomthombo wayo owenziweyo wemitha ephezulu kunye nomthombo wamasuntswana wamandla aphezulu unoluhlu olubanzi lwexabiso lesicelo kwiindlela ezininzi zophando ezisisiseko ezifana nefiziksi yamandla aphezulu, i-particle physics, i-plasma physics, i-nuclear physics kunye ne-astrophysics, kunye nesiphumo senzululwazi. iziphumo zophando zinokukhonza amashishini afanelekileyo obuchwepheshe obuphezulu, impilo yezonyango, amandla okusingqongileyo kunye nokhuseleko lwelizwe lokhuselo. Ukusukela oko kwaveliswa itekhnoloji yokukhulisa ipulse ngo-1985, ukuvela kwe-watt yokuqala yesingqi sehlabathi.laserngo-1996 kunye nokugqitywa kwe-laser yokuqala ye-10-beat watt yehlabathi ngo-2017, ugxininiso lwelaser ye-ultra-short kwixesha elidlulileyo ubukhulu becala ibikukufezekisa "ukukhanya okukhulu kakhulu". Kwiminyaka yakutshanje, uphando lubonise ukuba phantsi kwemeko yokugcina i-super laser pulses, ukuba isantya sokuhanjiswa kwe-pulse ye-super ultra-short laser inokulawulwa, inokuzisa isiphumo esiphindwe kabini ngesiqingatha somzamo kwezinye izicelo zomzimba, ezilindelekileyo. ukunciphisa isikali se-super ultra-shortizixhobo laser, kodwa iphucule isiphumo sayo kwi-high-field laser physics experiments.
Ukugqwethwa kwe-pulse phambi kwe-ultra-strong ultrashort laser
Ukuze ufumane amandla aphezulu phantsi kwamandla alinganiselwe, ububanzi be-pulse buncitshiswe ukuya kwi-20 ~ 30 femtoseconds ngokwandisa i-bandwidth yokufumana. I-pulse energy ye-laser yangoku ye-10-beak-watt ultra-short-short laser imalunga ne-300 joules, kwaye umda ophantsi womonakalo we-compressor grating wenza ukuba i-beam aperture ibe mkhulu kune-300 mm. I-pulse beam ene-20 ~ 30 ye-femtosecond pulse ububanzi kunye ne-300 mm aperture kulula ukuthwala ukuphazamiseka kwe-spatiotemporal coupling, ngakumbi ukuguqulwa kwe-pulse front. Umzobo 1 (a) ubonisa ukwahlulwa kwesithuba sexesha le-spatio-temporal yomphambili we-pulse kunye nomphambili wesigaba obangelwa yindima yendima yosasazo, kwaye eyokuqala ibonisa "i-spatio-temporal tilt" xa kuthelekiswa nomva. Enye yeyona nto intsonkothileyo “yokujika kwexesha lasesithubeni” okubangelwa yinkqubo yelens. IKHIWANE. 2 Ngenxa yoko, ukukhanya okugxininisiweyo kuncitshiswe kakhulu, okungahambelani nesicelo sentsimi esomeleleyo se-laser ultra-short.
IKHIWANE. 2
Ulawulo lwesantya se-Pulse ye-ultra-strongultrashort laser
Okwangoku, imiqadi yeBessel eveliswe yiconical superposition yamaza enqwelomoya ibonise ixabiso lesicelo kwifiziksi yelaser yasendle. Ukuba i-conically superimposed pulsed beam ine-axisymmetric pulse front distribution, ngoko i-geometric center intensity ye-x-ray wave packet njengoko kubonisiwe kwi-Figure 2 ingaba yi-superluminal engaguqukiyo, i-subluminal engaguqukiyo, i-accelerated superluminal, kunye ne-decelerated subluminal. Nditsho indibaniselwano yesipili esinokukhubazeka kunye nohlobo lwesigaba semodyuli yokukhanya yendawo inokuvelisa imilo engafanelekanga ye-spatio-temporal ye-pulse front, kwaye emva koko ivelise isantya sothumelo esilawulekayo ngokungenamthetho. Isiphumo somzimba esingentla kunye nobuchwepheshe bayo bokumodareyitha bunokuguqula "ukuphazamiseka" kwe-pulse front ibe "kulawulo" lwe-pulse front, kwaye emva koko uqonde injongo yokumodareyitha isantya sothumelo lwe-ultra-strong ultra-short laser.
IKHIWANE. 2 I (a) isantya esihlala sikhawuleza kunokukhanya, (b) isibane esingaguqukiyo, (c) isantya esikhawulezayo kunokukhanya, kunye (d) nesibane sokukhanya esithotyiweyo sepulse esiveliswe ngokuphezulu sibekwe kumbindi wejiyometri wommandla we-Superposition.
Nangona ukufunyaniswa kokuphazamiseka kwangaphambili kwe-pulse ngaphambili kune-super ultra-short laser, ixhalabele ngokubanzi kunye nophuhliso lwe-laser ultra-short. Ixesha elide, akuncedi ekufezekiseni injongo ephambili ye-super ultra-short laser - i-ultra-high egxininise ekukhanyeni kokukhanya, kwaye abaphandi baye basebenzela ukucinezela okanye ukuphelisa ukuphazamiseka okuhlukeneyo kwe-pulse front. Namhlanje, xa "i-pulse front distortion" iphuhlisiwe ibe "yi-pulse front control", iphumelele ukulawulwa kwesantya sokuhanjiswa kwe-super ultra-short laser, ibonelela ngeendlela ezintsha kunye namathuba amatsha okusetyenziswa kwe-laser ultra-short laser i-fiziksi ye-laser ephezulu.
Ixesha lokuposa: May-13-2024