Na musammanultrafast Laserkashi na biyu
Watsawa da bugun jini yadawa: Rukunin jinkiri watsawa
Ɗaya daga cikin ƙalubale mafi wahala na fasaha da aka fuskanta lokacin amfani da laser na ultrafast shine kiyaye tsawon lokacin gajeriyar bugun jini da aka fara fitar da shi daga farko.Laser. Kwayoyin ultrafast suna da saurin kamuwa da jujjuyawar lokaci, wanda ke sa bugun jini ya fi tsayi. Wannan tasirin yana kara muni yayin da tsawon lokacin bugun bugun farko ya ragu. Yayin da laser ultrafast na iya fitar da bugun jini tare da tsawon daƙiƙa 50, ana iya haɓaka su cikin lokaci ta hanyar amfani da madubai da ruwan tabarau don watsa bugun bugun jini zuwa wurin da aka yi niyya, ko ma kawai isar da bugun bugun ta iska.
Ana ƙididdige wannan ɓacin lokaci ta hanyar amfani da ma'auni da ake kira rukuni na jinkirta watsawa (GDD), wanda kuma aka sani da watsawa na biyu. A zahiri, akwai kuma sharuɗɗan watsawa masu girma waɗanda zasu iya shafar lokacin rarraba ultrafart-laser bugun jini, amma a aikace, yawanci ya isa kawai don bincika tasirin GDD. GDD ƙima ce mai dogaro da mitar da ta yi daidai da kaurin abin da aka bayar. Na'urorin watsawa kamar ruwan tabarau, taga, da abubuwan haƙiƙa galibi suna da ingantattun ƙimar GDD, wanda ke nuna cewa da zarar an matsa bugun jini na iya ba wa na'urorin watsawa tsawon lokacin bugun jini fiye da waɗanda ke fitarwa tatsarin laser. Na'urorin da ke da ƙananan mitoci (watau tsayin raƙuman ruwa) suna yaduwa da sauri fiye da abubuwan da aka haɗa tare da mafi girman mitoci (watau gajeriyar raƙuman ruwa). Yayin da bugun jini ke wucewa ta hanyar abubuwa da yawa, tsayin daka a cikin bugun jini zai ci gaba da kara gaba da gaba cikin lokaci. Domin guntu bugun jini durations, sabili da haka fadi da bandwidths, wannan sakamako ne kara gishiri da kuma iya haifar da gagarumin bugun jini lokaci murdiya.
Ultrafast Laser aikace-aikace
spectroscopy
Tun da zuwan ultrafast Laser kafofin, spectroscopy ya kasance daya daga cikin manyan wuraren aikace-aikacen su. Ta hanyar rage lokacin bugun bugun jini zuwa femtosecond ko ma dakika biyu, ana iya samun ci gaba mai ƙarfi a cikin ilimin kimiyyar lissafi, sunadarai da ilmin halitta waɗanda a tarihi ba za a iya kiyaye su ba. Ɗaya daga cikin mahimman matakai shine motsin atomatik, kuma lura da motsin atomic ya inganta fahimtar kimiyya game da matakai na asali kamar rawar jiki, rarraba kwayoyin halitta da canja wurin makamashi a cikin sunadaran hotuna.
bioimaging
Laser mafi girma-ikon ultrafast yana goyan bayan hanyoyin da ba na kan layi ba kuma suna haɓaka ƙuduri don hoton nazarin halittu, kamar microscopy mai ɗaukar hoto da yawa. A cikin tsarin hoto da yawa, don samar da sigina mara tushe daga maƙasudin nazarin halittu ko maƙasudin kyalli, dole ne photon biyu su mamaye sararin samaniya da lokaci. Wannan tsarin da ba na kan layi yana inganta ƙudurin hoto ta hanyar rage yawan siginonin kyalli wanda ke addabar nazarin ayyukan hoto ɗaya. An kwatanta asalin siginar da aka sauƙaƙe. Ƙananan yanki na motsa jiki na microscope multiphoton kuma yana hana phototoxicity kuma yana rage lalacewa ga samfurin.
Hoto na 1: Misalin zane na hanyar katako a cikin gwajin microscope mai yawan hoto
Laser kayan sarrafa
Maɓuɓɓugan Laser na Ultrafast sun kuma canza micromachining Laser da sarrafa kayan aiki saboda keɓaɓɓen hanyar da ultrashort bugun jini ke hulɗa da kayan. Kamar yadda aka ambata a baya, lokacin da ake magana da LDT, tsawon lokacin bugun jini na ultrafast yana da sauri fiye da sikelin lokaci na yaduwar zafi a cikin lattice na kayan. Laser ultrafast yana samar da wani yanki mafi ƙanƙanta da zafi ya shafa fiye dananosecond pulsed Laser, yana haifar da ƙananan asarar ƙaddamarwa da ƙarin mashin ɗin daidai. Wannan ka'ida kuma tana amfani da aikace-aikacen likita, inda haɓaka daidaitaccen yankan ultrafart-laser yana taimakawa rage lalacewar nama da ke kewaye da kuma inganta ƙwarewar haƙuri yayin tiyatar Laser.
Attosecond bugun jini: makomar laser ultrafast
Yayin da bincike ke ci gaba da haɓaka laser ultrafast, ana haɓaka sabbin sabbin hanyoyin haske tare da gajeriyar lokacin bugun jini. Don samun fahimtar hanyoyin tafiyar da jiki cikin sauri, masu bincike da yawa suna mai da hankali kan samar da bugun jini na attosecond - kimanin 10-18 s a cikin matsanancin zafin ultraviolet (XUV). Ƙwayoyin bugun jini na biyu suna ba da damar bin diddigin motsin lantarki da haɓaka fahimtarmu game da tsarin lantarki da injiniyoyi masu yawa. Duk da yake haɗin XUV attosecond lasers a cikin tsarin masana'antu har yanzu bai sami ci gaba mai mahimmanci ba, ci gaba da bincike da ci gaba a fagen zai kusan fitar da wannan fasaha daga cikin dakin gwaje-gwaje da kuma masana'antu, kamar yadda ya faru da femtosecond da picosecond.tushen laser.
Lokacin aikawa: Juni-25-2024