Gwero la kuwala kwa ultraviolet kochulukirachulukira kwambiri

Gwero la kuwala kwa ultraviolet kochulukirachulukira kwambiri

Njira zogwiritsira ntchito popondereza pamodzi ndi minda yamitundu iwiri zimapanga gwero la kuwala kwa ultraviolet komwe kumatuluka kwambiri
Pa ntchito za Tr-ARPES, kuchepetsa kutalika kwa mafunde a kuwala koyendetsa ndi kuwonjezera mwayi wa ionization ya gasi ndi njira yothandiza yopezera ma harmonics okwera komanso okwera kwambiri. Popanga ma harmonics okwera kwambiri ndi ma frequency obwerezabwereza kamodzi, njira yowirikiza kawiri kapena katatu imagwiritsidwa ntchito makamaka kuti iwonjezere mphamvu yopangira ma harmonics okwera kwambiri. Mothandizidwa ndi kupsinjika kwa post-pulse, ndikosavuta kukwaniritsa kuchuluka kwa mphamvu komwe kumafunikira popanga ma harmonics okwera kwambiri pogwiritsa ntchito kuwala kwafupipafupi kwa pulse drive, kotero kuti mphamvu yopangira ingapezeke kwambiri kuposa ya pulse drive yayitali.

Monochromator yokhala ndi grating iwiri imakwaniritsa kupendekera kwa pulse forward
Kugwiritsa ntchito chinthu chimodzi chosinthira mu monochromator kumabweretsa kusintha kwakuwalaNjira yozungulira mu cheza cha ultra-short pulse, yomwe imadziwikanso kuti pulse forward tilt, zomwe zimapangitsa kuti nthawi itambasulidwe. Kusiyana kwa nthawi yonse ya malo osinthira kuwala okhala ndi kutalika kwa diffraction λ pa diffraction order m ndi Nmλ, pomwe N ndiye chiwerengero chonse cha mizere yolumikizira yowala. Mwa kuwonjezera chinthu chachiwiri chosinthira kuwala, kutsogolo kwa pulse kopendekeka kumatha kubwezeretsedwa, ndipo monochromator yokhala ndi nthawi yochepetsera kuwala ingapezeke. Ndipo posintha njira yowunikira pakati pa zigawo ziwiri za monochromator, grating pulse shaper ikhoza kusinthidwa kuti ikwaniritse bwino kufalikira kwa kuwala kwa harmonic. Pogwiritsa ntchito kapangidwe ka nthawi yochepetsera kuwala, Lucchini et al. adawonetsa kuthekera kopanga ndikuwonetsa ma ultraviolet pulses afupi kwambiri okhala ndi pulse m'lifupi mwa 5 fs.
Gulu lofufuza la Csizmadia ku ELE-Alps Facility ku European Extreme Light Facility linapeza mphamvu yowunikira kuwala kwa ultraviolet pogwiritsa ntchito monochromator yokhala ndi ma grating awiri mu mzere wa harmonic beam wobwerezabwereza komanso wapamwamba kwambiri. Iwo anapanga ma harmonics apamwamba pogwiritsa ntchito drive.laserndi liwiro lobwerezabwereza la 100 kHz ndipo idapeza kugunda kwa ultraviolet kwakukulu kwa 4 fs. Ntchitoyi ikutsegula mwayi watsopano woyesera nthawi yodziwira malo mu malo a ELI-ALPS.

Kuwala kwa ultraviolet komwe kumabwerezabwereza pafupipafupi kwambiri kwakhala kukugwiritsidwa ntchito kwambiri pophunzira za mphamvu za ma elekitironi, ndipo kwawonetsa kuthekera kwakukulu kogwiritsa ntchito m'munda wa attosecond spectroscopy ndi kujambula kwa microscopic. Ndi kupita patsogolo kosalekeza komanso kupanga zatsopano kwa sayansi ndi ukadaulo, kuwala kwa ultraviolet komwe kumabwerezabwereza pafupipafupi kwambiri kwakhala kukugwiritsidwa ntchito kwambiri.gwero la kuwalaikupita patsogolo motsatira njira yowonjezereka yobwerezabwereza, kuchuluka kwa photon flux, mphamvu ya photon yambiri komanso kutalika kwafupipafupi kwa pulse. M'tsogolomu, kafukufuku wopitilira pa magwero a kuwala kwa ultraviolet kochulukirachulukira kudzalimbikitsa kugwiritsa ntchito kwawo m'magawo amagetsi ndi kafukufuku wina. Nthawi yomweyo, ukadaulo wowongolera ndi kulamulira wa gwero la kuwala kwa ultraviolet kochulukirachulukira komanso kugwiritsidwa ntchito kwake m'njira zoyesera monga angular resolution photoelectron spectroscopy zidzakhalanso cholinga cha kafukufuku wamtsogolo. Kuphatikiza apo, ukadaulo wa attosecond transient absorption spectroscopy wotsimikizika nthawi ndi ukadaulo wa microscopic imaging womwe umachokera ku gwero la kuwala kwa ultraviolet kochulukirachulukira nthawi zambiri ukuyembekezekanso kuphunziridwa, kupangidwa ndikugwiritsidwa ntchito kuti akwaniritse zithunzi zolondola kwambiri za attosecond time-resolved ndi nanospace-resolved mtsogolo.