Gwero lamphamvu kwambiri la kuwala kwa ultraviolet

Gwero lamphamvu kwambiri la kuwala kwa ultraviolet

Njira zotsatsira pambuyo pophatikiziridwa ndi magawo amitundu iwiri zimatulutsa kuwala kwamphamvu kwambiri kwa ultraviolet
Pamapulogalamu a Tr-ARPES, kuchepetsa kutalika kwa kuwala kwagalimoto ndikuwonjezera kuthekera kwa ionization ya gasi ndi njira zabwino zopezera ma flux apamwamba komanso ma harmonics apamwamba. Popanga ma harmonics apamwamba kwambiri okhala ndi ma frequency apamwamba obwereza, njira yowirikiza kawiri kapena katatu imatengedwa kuti iwonjezere kupanga bwino kwa ma harmonics apamwamba. Mothandizidwa ndi kuponderezedwa kwapambuyo pa pulse, ndikosavuta kukwaniritsa kuchuluka kwamphamvu kwamphamvu komwe kumafunikira kuti pakhale m'badwo wapamwamba wa harmonic pogwiritsa ntchito kuwala kocheperako, kotero kuti kupangika kwapamwamba kumatha kupezedwa kuposa kuthamangitsa kwanthawi yayitali.

Monochromator yawiri grating imapindula ndi chipukuta misozi
Kugwiritsa ntchito chinthu chimodzi chosiyana mu monochromator kumabweretsa kusinthakuwalaNjira yozungulira kwambiri mumtengo wa kugunda kwakutali kwambiri, komwe kumadziwikanso ngati kupendekera kutsogolo, zomwe zimapangitsa kuti nthawi italike. Kusiyana konse kwa nthawi kwa malo osiyanitsira okhala ndi kutalika kwa mawonekedwe a diffraction λ pa dongosolo la diffraction m ndi Nmλ, pomwe N ndi chiwerengero chonse cha mizere yowunikira. Powonjezera chinthu chachiwiri chosokoneza, kutsogolo kopendekeka kumatha kubwezeretsedwanso, ndipo monochromator yokhala ndi kuchedwa kwa nthawi imatha kupezeka. Ndipo posintha njira ya kuwala pakati pa zigawo ziwiri za monochromator, chojambula cha grating pulse shaper chikhoza kusinthidwa kuti chiteteze kufalikira kwachilengedwe kwa ma radiation apamwamba kwambiri. Pogwiritsa ntchito njira yolipirira nthawi yochedwa, Lucchini et al. adawonetsa kuthekera kopanga ndikuwonetsa ma ultra-short monochromatic kwambiri a ultraviolet pulse okhala ndi kugunda kwa 5 fs.
Gulu lofufuza la Csizmadia ku ELE-Alps Facility ku European Extreme Light Facility lidakwanitsa kusinthasintha komanso kusintha kwamphamvu kwa kuwala kwa ultraviolet kopitilira muyeso pogwiritsa ntchito kachromator yochedwa kuchedwetsa nthawi yolipirira mowirikiza mobwerezabwereza, mzere wapamwamba kwambiri wowongolera. Anapanga ma harmonics apamwamba kwambiri pogwiritsa ntchito galimotolaserndi kubwerezabwereza kwa 100 kHz ndikupeza kuphulika kwakukulu kwa ultraviolet kufalikira kwa 4 fs. Ntchitoyi imatsegula mwayi watsopano woyesera zokhazikika pakanthawi kozindikira situ pamalo a ELI-ALPS.

Gwero la kuwala kwa ultraviolet kwakhala likugwiritsidwa ntchito kwambiri pofufuza mphamvu za ma elekitironi, ndipo zawonetsa mwayi wogwiritsa ntchito kwambiri pazithunzi za attosecond spectroscopy ndi ma microscopic imaging. Ndi kupita patsogolo kosalekeza ndi luso la sayansi ndi ukadaulo, kubwereza mobwerezabwereza kwa ultraviolet koopsagwero lowalaikupita patsogolo molunjika kufupipafupi kubwerezabwereza, kuwonjezereka kwa photon flux, mphamvu yapamwamba ya photon ndi kufupikitsa kugunda kwa mtima. M'tsogolomu, kafukufuku wopitilira kubwereza pafupipafupi kwambiri kwa kuwala kwa ultraviolet kudzalimbikitsa kugwiritsa ntchito kwawo mphamvu zamagetsi ndi magawo ena ofufuza. Nthawi yomweyo, kukhathamiritsa ndi kuwongolera ukadaulo wa gwero lamphamvu lobwerezabwereza kwambiri la ultraviolet ndikugwiritsa ntchito kwake munjira zoyesera monga ma angular resolution photoelectron spectroscopy idzakhalanso cholinga cha kafukufuku wamtsogolo. Kuphatikiza apo, ukadaulo wa attosecond transient absorption spectroscopy wokhazikika komanso ukadaulo wanthawi yeniyeni woyerekeza wotengera kubwereza pafupipafupi kwambiri kwa gwero la kuwala kwa ultraviolet akuyembekezeredwanso kuphunziridwa, kupangidwa ndikugwiritsidwa ntchito kuti akwaniritse kutsimikizika kwanthawi yayitali kwa attosecond. ndi kujambula kwa nanospace mtsogolomu.