Hasken da ake iya gani a ƙasa da daƙiƙa 20 na fettosecondtushen Laser mai canzawa
Kwanan nan, wata ƙungiyar bincike daga Burtaniya ta buga wani sabon bincike, inda ta sanar da cewa sun yi nasarar ƙirƙiro wani haske mai haske mai haske mai haske mai matsakaicin ƙarfin lantarki na ƙasa da digiri 20 na fettosecond wanda za a iya gani a cikinsa.tushen laser mai pulsedWannan tushen laser mai bugun zuciya, mai sauri sosaiLaser ɗin fiberTsarin yana da ikon samar da bugun jini tare da raƙuman ruwa masu iya canzawa, tsawon lokaci mai tsawo, kuzari har zuwa nanojoules 39, da kuma ƙarfin da ya wuce megawatts 2, wanda ke buɗe sabbin damar amfani ga fannoni kamar su spectroscopy mai sauri, hoton halittu, da sarrafa masana'antu.
Babban abin da wannan fasaha ta fi mayar da hankali a kai shi ne haɗakar hanyoyi guda biyu masu inganci: "Gain-Maned nonlinear Amplification (GMNA)" da "Resonant Dispersive Wave (RDW) emission". A da, don samun irin waɗannan bugun ultrashshort masu ƙarfi, ana buƙatar lasers titanium-sapphire ko amplifiers na gani. Waɗannan na'urori ba wai kawai suna da tsada ba, suna da girma, kuma suna da wahalar kulawa, amma kuma suna da iyaka da ƙarancin maimaitawa da kewayon daidaitawa. Maganin fiber-all-fiber da aka haɓaka a wannan lokacin ba wai kawai yana sauƙaƙa tsarin tsarin ba ne kawai, har ma yana rage farashi da rikitarwa sosai. Yana ba da damar samar da kai tsaye na femtosecond na ƙasa da 20, wanda za a iya gyarawa zuwa nanometers 400 zuwa 700 kuma fiye da bugun ƙarfi mai ƙarfi a babban mita na 4.8 MHz. Ƙungiyar bincike ta cimma wannan ci gaba ta hanyar tsarin da aka tsara daidai. Da farko, sun yi amfani da oscillator fiber ytterbium mai kariya ta yanayin polarization-kulle bisa madubin zobe mara layi (NALM) a matsayin tushen iri. Wannan ƙira ba wai kawai tana tabbatar da dorewar tsarin na dogon lokaci ba, har ma tana guje wa matsalar lalatawar masu shan ruwa na zahiri. Bayan haɓakawa da matse bugun jini, ana shigar da bugun iri cikin matakin GMNA. GMNA tana amfani da daidaitawar kai-tsaye da rarraba riba mara daidaituwa a cikin zaruruwan gani don cimma faɗaɗa spectral da samar da bugun ultrashort tare da kusan cikakkiyar chirp mai layi, wanda a ƙarshe ake matsawa zuwa ƙasa da daƙiƙa 40 ta hanyar nau'ikan grating. A lokacin matakin samar da RDW, masu bincike sun yi amfani da zaruruwan anti-resonance hollow-core waɗanda aka tsara kansu kuma aka ƙera su da kansu. Wannan nau'in zaruruwan gani yana da ƙarancin asara a cikin zaruruwan bugun famfo da yankin haske da ake iya gani, wanda ke ba da damar canza makamashi yadda ya kamata daga famfo zuwa raƙuman da aka watsar da kuma guje wa tsangwama da zaren resonant mai asarar asara ke haifarwa. A ƙarƙashin yanayi mafi kyau, ƙarfin bugun bugun da tsarin ke fitarwa zai iya kaiwa nanojoules 39, mafi ƙarancin faɗin bugun zai iya kaiwa daƙiƙa 13 na femtoseconds, ƙarfin kololuwar zai iya kaiwa megawatts 2.2, kuma ingancin canza makamashi zai iya kaiwa 13%. Abin da ya fi ban sha'awa shi ne ta hanyar daidaita ma'aunin matsin lamba na iskar gas da zare, ana iya faɗaɗa tsarin cikin sauƙi zuwa ga madannin ultraviolet da infrared, wanda zai kai ga daidaita babban band daga zurfin ultraviolet zuwa infrared.
Wannan binciken ba wai kawai yana da muhimmiyar rawa a fannin photonics ba, har ma yana buɗe sabon yanayi ga fannonin masana'antu da aikace-aikace. Misali, a fannoni kamar daukar hoto mai daukar hoto mai yawa, nazarin lokaci mai sauri, sarrafa kayan aiki, maganin daidaitacce, da kuma binciken gani mai sauri, wannan sabon nau'in hasken da ke da sauƙin amfani zai samar wa masu amfani da kayan aiki da sassauci da ba a taɓa gani ba. Musamman a yanayin da ke buƙatar yawan maimaitawa, ƙarfin kololuwa da bugun zuciya mai gajeru, wannan fasaha babu shakka tana da gasa kuma tana da ƙarfin haɓakawa mafi girma idan aka kwatanta da tsarin titanium-sapphire ko na gani na gargajiya.
A nan gaba, ƙungiyar masu binciken tana shirin ƙara inganta tsarin, kamar haɗa tsarin gine-ginen yanzu wanda ke ɗauke da kayan gani na sarari da yawa cikin zaruruwan gani, ko ma amfani da oscillator guda ɗaya na Mamyshev don maye gurbin haɗin oscillator da amplifier na yanzu, don cimma ƙarancin tsari da haɗa tsarin. Bugu da ƙari, ta hanyar daidaitawa da nau'ikan zaruruwan hana amsawa daban-daban, gabatar da iskar gas mai aiki da Raman da na'urori masu ninka mita, ana sa ran faɗaɗa wannan tsarin zuwa babban band, yana samar da mafita na laser mai faɗi, mai faɗi, da kuma mafitar laser mai sauri don fannoni da yawa kamar ultraviolet, haske mai gani da infrared.
Hoto na 1. Tsarin zane na gyaran laser mai bugun jini
Lokacin Saƙo: Mayu-28-2025