Shintsha ijubane lokushaya kwenhliziyosuper-eqinile ultrashort laser
Amalaser ama-Super ultra-short ngokuvamile abhekisela kuma-laser pulses anobubanzi be-pulse amashumi namakhulu ama-femtoseconds, amandla aphezulu ama-terawatts nama-petawatts, futhi amandla awo okukhanya agxilile adlula u-1018 W/cm2. I-super ultra-short laser kanye nomthombo wayo okhiqizwe we-super radiation kanye nomthombo wezinhlayiya zamandla aphezulu inenani elibanzi lenani lesicelo ezindaweni eziningi zocwaningo eziyisisekelo ezifana ne-high energy physics, i-particle physics, i-plasma physics, i-nuclear physics ne-astrophysics, kanye nokuphuma kwesayensi. imiphumela yocwaningo ingase inikeze izimboni ezifanele zobuchwepheshe obuphezulu, ezempilo yezokwelashwa, amandla emvelo kanye nokuphepha kwezwe kwezokuvikela. Kusukela kwasungulwa ubuchwepheshe bokukhulisa ukushaya kwenhliziyo ngo-1985, kwavela i-watt yokuqala yesigqi emhlabeni.laserngo-1996 kanye nokuphothulwa kwelaser yokuqala ye-watt eyi-10-beat ngo-2017, i-super ultra-short laser eyayigxilwe kakhulu esikhathini esidlule bekuwukuthola "ukukhanya okukhulu kakhulu". Eminyakeni yamuva nje, ucwaningo luye lwabonisa ukuthi ngaphansi kwesimo sokugcina ama-super laser pulses, uma ijubane lokudlulisa i-pulse le-super ultra-short laser lingalawulwa, lingaletha umphumela ophindwe kabili ngesigamu somzamo kwezinye izinhlelo zokusebenza zomzimba, okulindelekile. ukunciphisa isikali se-super ultra-shortamadivaysi laser, kodwa ithuthukise umphumela wayo ekuhlolweni kwe-laser physics yenkundla ephezulu.
Ukuhlanekezela kokushaya kwangaphambili kwe-ultrashort ultrashort laser
Ukuze uthole amandla aphezulu ngaphansi kwamandla alinganiselwe, ububanzi be-pulse buncishiswa bube ngama-femtoseconds angu-20~30 ngokwandisa umkhawulokudonsa wokuzuza. Amandla we-pulse we-laser yamanje engu-10-beak-watt ultrashort cishe ama-joules angu-300, futhi umkhawulo womonakalo ophansi we-compressor grating wenza indawo yokuvula i-beam ibe mkhulu kuno-300 mm. I-pulse beam enobubanzi be-pulse femtosecond engu-20 ~ 30 kanye nokuvuleka okungu-300 mm kulula ukuthwala ukuhlanekezela kokuhlanganisa kwe-spatiotemporal, ikakhulukazi ukuhlanekezela kwe-pulse front. Umfanekiso 1 (a) ubonisa ukuhlukana kwe-spatio-temporal kwe-pulse front kanye nesigaba sangaphambili esibangelwa ukuhlakazeka kwendima ye-beam, futhi esokuqala sibonisa "i-spatio-temporal tilt" ngokuhlobene nokwakamuva. Okunye “ukugoba kwesikhathi sendawo” okuyinkimbinkimbi okubangelwa uhlelo lwamalensi. I-FIG. 1 (b) ikhombisa umthelela wepulse ekahle ngaphambili, ishayela ehlanekezelwe ngaphambili kanye nepulse egobile ngaphambili ekuhlanekezelekeni kwe-spatio-temporal yenkundla yokukhanya kokuqondiwe. Ngenxa yalokho, amandla okukhanya okugxilile ancipha kakhulu, angahambisani nokusetshenziswa kwensimu eqinile ye-super ultra-short laser.
I-FIG. 2
Ukulawulwa kwesivinini se-Pulse sokuqine kakhului-ultrashort laser
Njengamanje, imishayo ye-Bessel ekhiqizwe yi-conical superposition yamaza endiza ibonise inani lokusebenza ku-high field laser physics. Uma i-pulsed pulsed beam ebekwe phezulu inokusabalalisa ngaphambili kwe-axisymmetric pulse, khona-ke ukuqina kwesikhungo sejiyomethri kwephakethe legagasi le-X-ray elikhiqiziwe njengoba kuboniswe kuMfanekiso 2 kungaba yi-superluminal engaguquki, i-subluminal engaguquki, i-superluminal esheshisiwe, kanye ne-subluminal eyehlisiwe. Ngisho nenhlanganisela yesibuko esigogekayo kanye nemodulator yokukhanya yendawo yohlobo lwesigaba ingaveza ukuma okungahleliwe kwe-spatio-temporal ye-pulse front, bese ikhiqiza isivinini esilawulekayo esilawulekayo. Umthelela womzimba ongenhla kanye nobuchwepheshe bawo bokuguquguquka kungaguqula "ukuhlanekezela" kwe-pulse front kube "ukulawula" kwe-pulse front, bese uqaphela injongo yokulinganisa isivinini sokudlulisa se-ultra-strong ultra-short laser.
I-FIG. 2 (a) ukukhanya okuqhubekayo okushesha kakhulu kunokukhanya, (b) ukukhanya okuphansi okungaguquki, (c) okusheshisa kakhulu kunokukhanya, kanye (d) namaphaphu okukhanya aphansi ancishisiwe akhiqizwe indawo ephezulu atholakala enkabeni yejiyomethri yendawo enendawo ephezulu.
Nakuba ukutholakala kokuhlanekezela kwe-pulse front kungaphambi kwesikhathi kune-super ultra-short laser, kukhathazwe kabanzi kanye nokuthuthukiswa kwe-super ultra-short laser. Isikhathi eside, akusizi ekufezekisweni komgomo oyinhloko we-super ultra-short laser - ukuqina kokukhanya okugxile kakhulu, futhi abacwaningi bebesebenzela ukucindezela noma ukuqeda ukuhlanekezela okuhlukahlukene kwe-pulse front. Namuhla, lapho “i-pulse front distortion” isithuthuke yaba “i-pulse front control”, isifinyelele ukulawulwa kwejubane lokudlulisa le-super ultra-short laser, ihlinzeka ngezindlela ezintsha namathuba amasha okusetshenziswa kwe-super ultra-short laser in. high-field laser physics.
Isikhathi sokuthumela: May-13-2024