Ƙarƙashin 20 femtosecond haske bayyaneTunable pulsed Laser source
Kwanan nan, wata ƙungiyar bincike daga Burtaniya ta buga wani sabon bincike, inda ta sanar da cewa, sun sami nasarar ƙera na'ura mai ba da hanya tsakanin hanyoyin sadarwa na megawatt matakin sub-20 femtosecond.pulsed Laser tushen. Wannan pulsed Laser tushen, ultrafastfiber LaserTsarin yana da ikon samar da bugun jini tare da madaidaicin raƙuman raƙuman ruwa, gajeriyar gajeriyar lokaci, kuzari har zuwa nanojoules 39, da ƙarfin kololuwa sama da megawatts 2, buɗe sabon sabbin aikace-aikacen fage kamar ultrafast spectroscopy, nazarin halittu, da sarrafa masana'antu.
Babban mahimmancin wannan fasaha ya ta'allaka ne a cikin haɗuwa da hanyoyi guda biyu masu yankewa: "Gain-Managed nononlinear Amplification (GMNA)" da "Resonant Dispersive Wave (RDW) watsi". A da, don samun irin wannan babban aiki mai jujjuyawa ultrashshort pulses, tsada da hadaddun lasers titanium-sapphire ko amplifiers na gani na gani yawanci ana buƙata. Waɗannan na'urori ba kawai masu tsada ba ne, masu girma, da wahalar kiyayewa, amma kuma an iyakance su ta ƙarancin ƙimar maimaitawa da jeri na daidaitawa. Maganin duk-fiber ɗin da aka haɓaka wannan lokacin ba kawai yana sauƙaƙe tsarin gine-ginen tsarin ba har ma yana rage farashi da rikitarwa. Yana ba da damar tsara kai tsaye na sub-20 femtosecond, mai iya daidaitawa zuwa 400 zuwa 700 nanometers kuma sama da ƙarfin bugun jini mai ƙarfi a babban maimaitawar 4.8 MHz. Ƙungiyar binciken ta sami wannan ci gaba ta hanyar ingantaccen tsarin gine-gine. Da fari dai, sun yi amfani da cikakkiyar madaidaicin-tsare yanayin kulle-kulle ytterbium fiber oscillator dangane da madubin ƙara girman da ba na kan layi ba (NALM) azaman tushen iri. Wannan zane ba wai kawai yana tabbatar da kwanciyar hankali na tsawon lokaci na tsarin ba, amma kuma yana guje wa matsala ta lalatawar abubuwan da ke tattare da jiki. Bayan preamplification da bugun jini matsa lamba, da iri bugun jini ana gabatar da su a cikin matakin GMNA. GMNA tana amfani da tsarin kai-tsaye da rarrabuwar ribar asymmetric na tsayi a cikin filaye na gani don cimma fa'ida ta musamman da kuma haifar da ƙwanƙwasa ƙwanƙwasa tare da kusan cikakkiyar tsawa na madaidaiciya, waɗanda a ƙarshe an matsa su zuwa ƙananan 40 femtose seconds ta hanyar nau'i-nau'i na grating. A lokacin matakin ƙarni na RDW, masu bincike sun yi amfani da ƙira na kansu da ƙera manyan filaye masu ƙarfi-resonator tara. Irin wannan nau'in fiber na gani yana da ƙarancin asara sosai a cikin rukunin bugun bugun jini da yankin haske da ake iya gani, yana ba da damar kuzarin da za a iya jujjuya shi da kyau daga famfo zuwa igiyar da aka tarwatsa da kuma guje wa tsangwama da babban rukunin resonant ke haifar da shi. A karkashin mafi kyau duka yanayi, watsawa kalaman bugun jini makamashi fitarwa ta tsarin zai iya kai 39 nanojoules, mafi guntu bugun jini nisa iya isa 13 femtose seconds, da kololuwa ikon iya zama kamar yadda 2.2 megawatts, da kuma makamashi hira yadda ya dace zai iya zama kamar yadda 13%. Har ma mafi ban sha'awa shi ne cewa ta hanyar daidaita ma'aunin iskar gas da ma'aunin fiber, ana iya ƙaddamar da tsarin cikin sauƙi zuwa ultraviolet da infrared bands, samun damar daidaitawa mai fadi daga zurfin ultraviolet zuwa infrared.
Wannan bincike ba wai kawai yana riƙe da mahimmanci a cikin ainihin filin photonics ba, har ma yana buɗe sabon yanayi ga masana'antu da filayen aikace-aikace. Misali, a cikin fagage irin su hoto mai ɗaukar hoto da yawa, ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun lokaci, sarrafa kayan aiki, ingantaccen magani, da bincike na ultrafast mara kyau na gani, wannan ƙarami, inganci, da ƙarancin farashi sabon nau'in tushen hasken ultrafast zai ba masu amfani da kayan aikin da ba a taɓa gani ba da sassauci. Musamman a yanayin yanayin da ke buƙatar ƙimar maimaitawa mai girma, ƙarfin kololuwa da gajeriyar bugun jini, wannan fasaha babu shakka ta fi fafatawa kuma tana da babban ƙarfin haɓakawa idan aka kwatanta da na al'ada titanium-sapphire ko tsarin ƙarawa na gani na gani.
A nan gaba, ƙungiyar masu bincike suna shirin ƙara haɓaka tsarin, kamar haɗawa da gine-gine na yanzu wanda ya ƙunshi nau'o'in abubuwan gani na sararin samaniya da yawa a cikin filaye na gani, ko ma yin amfani da mamyshev oscillator guda ɗaya don maye gurbin oscillator na yanzu da haɗin amplifier, don cimma ƙananan haɓakawa da haɗin kai na tsarin. Bugu da ƙari, ta hanyar daidaitawa da nau'o'in nau'o'in nau'i na nau'i-nau'i na anti-resonance fibers, gabatar da Raman mai aiki gas da kuma mita sau biyu modules, wannan tsarin ana sa ran za a fadada zuwa wani fadi band, samar da duk-fiber, wideband, ultrafast Laser mafita ga mahara filayen kamar ultraviolet, bayyane haske da infrared.
Hoto 1. Zane-zane na daidaitawa na laser pulsed
Lokacin aikawa: Mayu-28-2025