Sinthani liwiro la kugunda kwa mtima kwa laser yamphamvu kwambiri ya ultrashort

Sinthani liwiro la kugunda kwa mtimalaser yamphamvu kwambiri ya ultrashort

Ma laser afupi kwambiri nthawi zambiri amatanthauza ma laser pulses okhala ndi ma pulse width a makumi ndi mazana a femtoseconds, mphamvu yayikulu ya terawatts ndi petawatts, ndipo mphamvu yawo yowunikira yolunjika imaposa 1018 W/cm2. Laser yafupi kwambiri komanso gwero lake la super radiation komanso gwero la tinthu tamphamvu kwambiri zimakhala ndi phindu lalikulu pakugwiritsa ntchito njira zambiri zofufuzira monga fizikisi yamphamvu kwambiri, fizikisi ya tinthu tating'onoting'ono, fizikisi ya plasma, fizikisi ya nyukiliya ndi astrophysics, ndipo zotsatira za kafukufuku wasayansi zimatha kutumikira mafakitale apamwamba, thanzi lachipatala, mphamvu zachilengedwe komanso chitetezo cha dziko. Kuyambira pomwe ukadaulo wa chirped pulse amplification unayamba mu 1985, kutulukira kwa beat watt yoyamba padziko lonse lapansi.laserMu 1996 ndi kumalizidwa kwa laser yoyamba ya 10-beat watt padziko lonse lapansi mu 2017, cholinga cha laser ya super ultra-short m'mbuyomu chinali kupeza "kuwala kwamphamvu kwambiri". M'zaka zaposachedwa, kafukufuku wasonyeza kuti potengera kusunga ma pulse a super laser, ngati liwiro la kutumiza ma pulse la laser ya super ultra-short lingathe kulamulidwa, likhoza kubweretsa zotsatira kawiri ndi theka la khama m'magwiritsidwe ena akuthupi, zomwe zikuyembekezeka kuchepetsa kukula kwa super ultra-short.zipangizo za laser, koma imawonjezera mphamvu zake mu kuyesa kwa fizikisi ya laser yamphamvu kwambiri.

Kusokonekera kwa kugunda kwa mtima kutsogolo kwa laser yamphamvu kwambiri ya ultrashort
Kuti mupeze mphamvu yayikulu pogwiritsa ntchito mphamvu zochepa, m'lifupi mwa pulse imachepetsedwa kufika pa 20~30 femtoseconds powonjezera bandwidth ya gain. Mphamvu ya pulse ya laser ya 10-beak-watt ultra-short ndi pafupifupi 300 joules, ndipo malire ochepa a kuwonongeka kwa compressor grating amapangitsa kuti beam aperture ikhale yayikulu kuposa 300 mm. Mpweya wa pulse wokhala ndi 20~30 femtosecond pulse width ndi 300 mm aperture ndi wosavuta kunyamula spatiotemporal coupling distortion, makamaka kupotoka kwa pulse front. Chithunzi 1 (a) chikuwonetsa kulekanitsidwa kwa spatio-temporal kwa pulse front ndi phase front komwe kumayambitsidwa ndi beam role dispersion, ndipo choyamba chikuwonetsa "spatio-temporal tilt" poyerekeza ndi chachiwiri. China ndi "curvature of space-time" yovuta kwambiri yomwe imayambitsidwa ndi lens system. Chithunzi 1 (b) chikuwonetsa zotsatira za pulse front yoyenera, integrated pulse front ndi bent pulse front pa spatio-temporal distortion ya light field pa chandamale. Zotsatira zake, mphamvu ya kuwala kolunjika imachepa kwambiri, zomwe sizingathandize kugwiritsa ntchito laser yachangu kwambiri.

CHITHUNZI 1 (a) kupendekeka kwa kutsogolo kwa pulse komwe kumayambitsidwa ndi prism ndi grating, ndi (b) zotsatira za kupotoka kwa kutsogolo kwa pulse pa malo owunikira nthawi pa chandamale

Kulamulira liwiro la kugunda kwa mtima kwa mphamvu kwambirilaser yaifupi kwambiri
Pakadali pano, matabwa a Bessel opangidwa ndi conical superposition ya mafunde a plane awonetsa kufunika kogwiritsidwa ntchito mu high field laser physics. Ngati conically superimposed pulsed beam ili ndi axisymmetric pulse front distribution, ndiye kuti geometric center intensity ya X-ray wave pack yomwe yapangidwa monga momwe zasonyezedwera pa Chithunzi 2 ikhoza kukhala constant superluminal, constant subluminal, accelerated superluminal, ndi decelerated subluminal. Ngakhale kuphatikiza kwa deformable mirror ndi phase type spatial light modulator kungapangitse mawonekedwe a spatio-temporal a pulse front, kenako ndikupanga consistent controlable transmission speed. physical effect yomwe ili pamwambapa ndi ukadaulo wake wosinthira zimatha kusintha "kupotoza" kwa pulse front kukhala "control" ya pulse front, kenako kuzindikira cholinga chosinthira transmission speed ya ultra-strong ultra-short laser.

CHITHUNZI 2 (a) kuwala kofulumira kuposa kuwala, (b) kuwala kosasunthika kosalekeza, (c) kuwala kofulumira kuposa kuwala, ndi (d) kuwala kocheperako komwe kumapangidwa ndi superposition kuli pakati pa geometric ya dera la superposition

Ngakhale kuti kupezeka kwa kupotoza kutsogolo kwa pulse ndi koyambirira kuposa laser ya super ultra-short, kwakhala kukukhudzidwa kwambiri pamodzi ndi chitukuko cha laser ya super ultra-short. Kwa nthawi yayitali, sikuthandiza kukwaniritsa cholinga chachikulu cha laser ya super ultra-short - ultra-high focusing light energy, ndipo ofufuza akhala akugwira ntchito yoletsa kapena kuthetsa kupotoza kwina kulikonse kwa pulse front. Masiku ano, pamene "kupotoza kutsogolo kwa pulse" kwakhala "kulamulira kutsogolo kwa pulse", kwakwaniritsa kuwongolera liwiro la kutumiza kwa laser ya super ultra-short, kupereka njira zatsopano ndi mwayi watsopano wogwiritsira ntchito laser ya super ultra-short mu physics ya laser yamphamvu.