Tshintsha isantya se-pulse ye-I-laser emfutshane kakhulu neyomeleleyo
Iilaser ezimfutshane kakhulu zibhekisa kwiilaser pulses ezinobubanzi bepulse bamashumi namakhulu eefemtoseconds, amandla aphezulu eeterawatts kunye neepetawatts, kwaye ukukhanya kwazo okugxile kungaphezulu kwe-1018 W/cm2. Ilaser emfutshane kakhulu kunye nomthombo wayo wemitha ephezulu kunye nomthombo wezinto ezinamandla aphezulu zinoluhlu olubanzi lwexabiso lesicelo kwiindlela ezininzi zophando ezisisiseko ezifana nefiziksi yamandla aphezulu, ifiziksi yento, ifiziksi yeplasma, ifiziksi yenyukliya kunye ne-astrophysics, kwaye iziphumo zophando lwesayensi zinokukhonza amashishini afanelekileyo obuchwephesha obuphezulu, impilo yezonyango, amandla okusingqongileyo kunye nokhuseleko lokhuselo lwesizwe. Ukusukela ekusungulweni kwetekhnoloji yokukhulisa i-pulse ephithizelayo ngo-1985, ukuvela kwe-watt yokuqala yehlabathi.ilezaNgo-1996 kunye nokugqitywa kwelaser yokuqala ye-10-beat watt kwihlabathi ngo-2017, ingqwalasela yelaser emfutshane kakhulu kwixesha elidlulileyo ibikukufezekisa "ukukhanya okunamandla kakhulu". Kwiminyaka yakutshanje, izifundo zibonise ukuba phantsi kwemeko yokugcina iipulse ze-super laser, ukuba isantya sokudlulisa i-pulse selaser emfutshane kakhulu sinokulawulwa, sinokuzisa iziphumo eziphindwe kabini ngesiqingatha somzamo kwezinye izicelo zomzimba, okulindeleke ukuba kunciphise ubungakanani be-super ultra-short.izixhobo zelaser, kodwa iphucula impembelelo yayo kwiimvavanyo zefiziksi yelaser ephezulu.
Ukuphazamiseka kwe-pulse front ye-ultra-strong ultrashort laser
Ukuze kufumaneke amandla aphezulu phantsi kwamandla alinganiselweyo, ububanzi be-pulse buncitshiswa bube yi-20~30 femtoseconds ngokwandisa i-gain bandwidth. Amandla e-pulse ye-laser yangoku ye-10-beak-watt ultra-short imalunga ne-300 joules, kwaye umda womonakalo ophantsi we-compressor grating wenza ukuba i-beam aperture ibe nkulu ngokubanzi kune-300 mm. I-pulse beam enobubanzi be-20~30 femtosecond pulse kunye ne-300 mm aperture kulula ukuyithwala i-spatiotemporal coupling distortion, ingakumbi i-distortion ye-pulse front. Umfanekiso 1 (a) ubonisa ukwahlukana kwe-spatio-temporal ye-pulse front kunye ne-phase front ebangelwa yi-beam role dispersion, kwaye owokuqala ubonisa "i-spatio-temporal tilt" xa kuthelekiswa nowokugqibela. Omnye "yi-curvature ye-space-time" eyinkimbinkimbi ebangelwa yinkqubo yelensi. UMfanekiso 1 (b) ubonisa iziphumo ze-best pulse front, i-intended pulse front kunye ne-bent pulse front kwi-spatio-temporal distortion ye-light field kwithagethi. Ngenxa yoko, amandla okukhanya okujolisiweyo ancitshiswa kakhulu, nto leyo engayi kunceda ekusetyenzisweni kwe-laser emfutshane kakhulu.
UMZOBO 1 (a) ukuthambekela komphambili we-pulse okubangelwa yi-prism kunye ne-grating, kunye (b) nesiphumo sokuphambuka komphambili we-pulse kwibala lokukhanya lesithuba-ixesha kwindawo ekujoliswe kuyo
Ulawulo lwesantya sepulse se-ultra-strongi-laser emfutshane kakhulu
Okwangoku, imisebe yeBessel eveliswa yi-conical superposition yamaza endiza ibonakalise ixabiso lesicelo kwi-high field laser physics. Ukuba i-conically superimposed pulsed beam inokusasazwa kwe-axisymmetric pulse front, ngoko ke i-geometric center intensity ye-X-ray wave pack eyenziweyo njengoko kubonisiwe kuMfanekiso 2 inokuba yi-constant superluminal, constant subluminal, accelerated superluminal, kunye ne-decelerated subluminal. Kwanokudibanisa i-deformable mirror kunye ne-phase type spatial light modulator kunokuvelisa imo ye-artio-temporal ye-pulse front, kwaye emva koko kuvelise isantya sokudlulisa esilawulwayo. Isiphumo somzimba esingentla kunye netekhnoloji yayo yokuguqula i-modulation inokuguqula "ukuphazamiseka" kwe-pulse front ibe "kulawulo" lwe-pulse front, kwaye emva koko iqonde injongo yokuguqula isantya sokudlulisa se-ultra-strong ultra-short laser.
UMZOBO 2 I-(a) ekhawulezayo kunokukhanya rhoqo, (b) engaphantsi rhoqo, (c) ekhawulezileyo ekhawulezayo kunokukhanya, kunye (d) nee-pulses zokukhanya okungaphantsi ezincitshisiweyo eziveliswa yi-superposition zifumaneka embindini wejiyometri wengingqi ye-superposition
Nangona ukufunyanwa kwe-pulse front distortion kungaphambi kwe-super ultra-short laser, bekusoloko kuxhalatyelwe kakhulu kunye nophuhliso lwe-super ultra-short laser. Kangangexesha elide, ayincedi ekufezekiseni injongo ephambili ye-super ultra-short laser - i-ultra-high focusing light intensity, kwaye abaphandi bebesebenza ukucinezela okanye ukuphelisa iintlobo ezahlukeneyo ze-pulse front distortion. Namhlanje, xa "i-pulse front distortion" iphuhlise yaba "lulawulo lwe-pulse front", ifikelele ekulawuleni isantya sokudlulisa se-super ultra-short laser, ibonelela ngeendlela ezintsha kunye namathuba amatsha okusetyenziswa kwe-super ultra-short laser kwi-high-field laser physics.
Ixesha leposi: Meyi-13-2024