Ci gaba a cikin matsanancin ultravioletfasahar tushen haske
A cikin 'yan shekarun nan, matsananci ultraviolet maɗaukaki masu jituwa sun ja hankalin jama'a sosai a fagen ƙarfin lantarki saboda ƙarfin haɗin kai, gajeren lokaci na bugun jini da kuma ƙarfin photon mai girma, kuma an yi amfani da su a wurare daban-daban da nazarin hoto. Tare da ci gaban fasaha, wannantushen haskeyana tasowa zuwa mafi girman mitar maimaituwa, haɓakar photon mafi girma, ƙarfin photon mafi girma da guntun bugun bugun jini. Wannan ci gaban ba kawai yana inganta ƙudurin auna matsananciyar hasken ultraviolet ba, har ma yana ba da sabbin dama don ci gaban fasaha na gaba. Don haka, zurfafa nazari da fahimtar babban maimaituwa matsananci hasken ultraviolet yana da ma'ana mai girma don ƙwarewa da amfani da fasahar yanke-yanke.
Don ma'aunin sikelin na'urar lantarki akan ma'auni na femtosecond da attosecond, adadin abubuwan da aka auna a cikin katako guda ɗaya sau da yawa ba su isa ba, yana sa ƙananan maɓuɓɓugan hasken wutar lantarki ba su isa su sami ingantaccen ƙididdiga ba. A lokaci guda, tushen hasken tare da ƙananan motsi na photon zai rage siginar-zuwa-amo na hoton ƙananan ƙwayoyin cuta a lokacin ƙayyadadden lokacin bayyanarwa. Ta hanyar ci gaba da bincike da gwaje-gwaje, masu bincike sun yi gyare-gyare da yawa a cikin haɓaka yawan amfanin ƙasa da ƙirar watsawa na babban maimaitawa mai tsananin hasken ultraviolet. An yi amfani da fasahar bincike ta ci-gaba da haɗe tare da babban maimaitawa matsananci hasken ultraviolet don cimma madaidaicin ma'auni na tsarin kayan aiki da tsarin kuzarin lantarki.
Aikace-aikace na matsananciyar hasken ultraviolet, kamar ma'auni na angular warware electron spectroscopy (ARPES), yana buƙatar katako na matsanancin hasken ultraviolet don haskaka samfurin. Electrons a saman samfurin suna farin ciki zuwa ci gaba da yanayin ta hanyar matsanancin hasken ultraviolet, kuma makamashin motsa jiki da watsi da kusurwa na photoelectrons ya ƙunshi bayanin tsarin band na samfurin. Mai nazarin lantarki tare da aikin ƙudurin kusurwa yana karɓar radiyon photoelectrons kuma ya sami tsarin band ɗin kusa da valence band na samfurin. Don ƙananan maimaitawa matsananci hasken ultraviolet, saboda bugun jini guda ɗaya ya ƙunshi babban adadin photons, zai faranta wa babban adadin photoelectrons a saman samfurin a cikin ɗan gajeren lokaci, kuma hulɗar Coulomb zai haifar da haɓaka mai tsanani na rarraba makamashin makamashi na photoelectron, wanda ake kira tasirin cajin sararin samaniya. Don rage tasirin tasirin cajin sararin samaniya, ya zama dole don rage photoelectrons da ke ƙunshe a cikin kowane bugun jini yayin da ake ci gaba da jujjuyawar photon, don haka ya zama dole don fitar daLasertare da babban maimaitawa don samar da matsanancin hasken ultraviolet tare da mitar maimaituwa.
Haɓaka fasahar rami mai ƙarfi tana fahimtar samar da babban tsari na jituwa a mitar maimaitawar MHz
Domin samun matsananciyar hasken ultraviolet tare da maimaituwar adadin har zuwa 60 MHz, ƙungiyar Jones a Jami'ar British Columbia a Burtaniya sun yi babban tsari mai jituwa a cikin rami na haɓaka haɓakar femtosecond (fsEC) don cimma ingantaccen tushen hasken ultraviolet mai amfani kuma an yi amfani da shi zuwa ƙarshen angular-spectroscopy electron.S. Tushen hasken yana da ikon isar da juzu'in photon fiye da 1011 lambobin photon a cikin daƙiƙa tare da jituwa guda ɗaya a ƙimar maimaitawar 60 MHz a cikin kewayon makamashi na 8 zuwa 40 eV. Sun yi amfani da ytterbium-doped fiber Laser tsarin a matsayin tushen iri don fsEC, da kuma sarrafa bugun jini halaye ta hanyar musamman Laser tsarin zane don rage m ambulaf diyya mita (fCEO) amo da kuma kula da kyau bugun jini matsawa halaye a karshen amplifier sarkar. Don cimma daidaiton haɓakar haɓakawa a cikin fsEC, suna amfani da madaukai masu sarrafa servo guda uku don sarrafa amsawa, wanda ke haifar da kwanciyar hankali mai ƙarfi a digiri biyu na 'yanci: lokacin tafiye-tafiye na keken bugun jini a cikin fsEC ya dace da lokacin bugun bugun laser, da canjin lokaci na mai ɗaukar wutar lantarki dangane da ambulaf ɗin bugun jini (watau, ambulan carrier ϕO).
Ta hanyar amfani da krypton gas a matsayin iskar gas mai aiki, ƙungiyar bincike ta sami nasarar samar da ingantaccen tsari a cikin fsEC. Sun yi ma'auni na Tr-ARPES na graphite kuma sun lura da saurin zafi da kuma jinkirin sake haɗawa da yawan jama'a na lantarki waɗanda ba su da kuzari, da kuma yanayin yanayin da ba su da zafi kai tsaye kusa da matakin Fermi sama da 0.6 eV. Wannan tushen haske yana ba da kayan aiki mai mahimmanci don nazarin tsarin lantarki na kayan aiki masu rikitarwa. Koyaya, ƙarni na babban tsari mai jituwa a cikin fsEC yana da buƙatu masu girma don yin tunani, rarrabuwar rarrabuwa, daidaitawa mai kyau na tsayin rami da kulle aiki tare, wanda zai yi tasiri sosai ga haɓaka haɓakar haɓakar rami mai haɓaka. A lokaci guda, amsawar lokaci mara kyau na plasma a wurin mai da hankali na rami shima kalubale ne. Don haka, a halin yanzu, irin wannan tushen hasken bai zama babban ultraviolet bababban tushen haske mai jituwa.
Lokacin aikawa: Afrilu-29-2024