Sub-20 femtose seconds iftiin muuqdaisha laser garaaca tunable
Dhawaan, koox cilmi baaris ah oo ka socota Boqortooyada Ingiriiska ayaa daabacday daraasad cusub, oo ku dhawaaqday inay si guul leh u sameeyeen nalka la arki karo ee heerka megawatt-hoosaadka 20 femtosecondisha laser garaacday. Isha laser garaacday, ultrafastlaser fiberNidaamku wuxuu awood u leeyahay in uu soo saaro garaacyo leh mowjadaha dhaadheer ee la hagaajin karo, waqtiyo gaagaaban, tamar aad u sarreeya oo ah 39 nanojoules, iyo awoodda ugu sarreysa ee ka badan 2 megawatts, furitaanka rajada codsiga cusub ee beeraha sida ultrafast spectroscopy, sawirka noolaha, iyo farsamaynta warshadaha.
Muujinta udub-dhexaadka ah ee tignoolajiyadani waxay ku jirtaa isku-darka laba hab oo goyn ah: "Gain-Managed nononlinear Amplification (GMNA)" iyo "Resonant Dispersive Wave (RDW) emission". Waagii hore, si loo helo wax-qabadka sare ee ultrash-gaaban ee garaaca wadnaha, laysarka titanium-sapphire qaali ah iyo kakan ayaa badanaa loo baahnaa. Aaladahani kaliya ma ahayn kuwo qaali ah, waa weyn, oo ay adagtahay in la joogteeyo, laakiin sidoo kale waxay xaddideen heerarka soo noqnoqda ee hooseeya iyo kala duwanaanta hagaajinta. Xalka dhan-fiber-ka ee la sameeyay waqtigan si weyn uma fududeeyo qaab dhismeedka nidaamka laakiin sidoo kale wuxuu si weyn u yareynayaa kharashyada iyo kakanaanta. Waxay awood u siinaysaa jiilka tooska ah ee min-20 femtosecond, la hagaajin karo ilaa 400 ilaa 700 nanometer iyo wixii ka baxsan garaaca awoodda sare ee soo noqnoqoshada sare ee 4.8 MHz. Kooxda cilmi-baadhistu waxay guushan ku gaadheen qaab-dhismeed si sax ah loo qaabeeyey. Marka hore, waxay isticmaaleen qaab-ilaalin buuxda oo habaysan oo xidhan ytterbium fiber oscillator oo ku salaysan muraayadda giraanta cod-weyneysiinta (NALM) oo ah isha abuurka. Naqshadeyntani ma aha oo kaliya inay hubiso xasilloonida muddada dheer ee nidaamka, laakiin sidoo kale waxay ka fogaanaysaa dhibaatada hoos u dhaca ee nuugayaasha jireed ee buuxa. Ka dib marka hore loo kordhiyo iyo cadaadiska garaaca wadnaha, garaaca abuurka waxaa lagu soo bandhigaa marxaladda GMNA. GMNA waxay adeegsataa habaynta is-wajiga iyo qaybinta faa'iidada asymmetrical dhererka ee fiilooyinka indhaha si loo gaadho fidinta muuqaalka leh oo ay dhaliso garaacyo ultrashort leh oo ku dhow qaylo toosan, kuwaas oo ugu dambeyntii lagu cadaadiyo ilaa 40 femtose seconds iyada oo loo marayo labo-labo. Intii lagu jiray marxaladda jiilka RDW, cilmi-baarayaashu waxay adeegsadeen is-qaabeeya oo la soo saaray sagaal-resonator-ka-hortagga-resonance-ka-muruqa godan Fiber indhaha noocan ah waxa uu leeyahay khasaare aad u hooseeya oo ku yimaadda bamka garaaca garaaca wadnaha iyo gobolka iftiinka muuqda, taas oo u sahlaysa tamarta in si hufan loogu beddelo mawjada kala firdhisan kana fogaato faragelinta ay keento guutada resonant ee khasaaraha sare leh. Marka la eego shuruudaha ugu fiican, wax soo saarka tamarta garaaca mawjada firidhsan ee nidaamka ayaa gaari kara 39 nanojoules, ballaca garaaca garaaca ugu gaaban wuxuu gaari karaa 13 femtose seconds, awoodda ugu sarreysa waxay noqon kartaa ilaa 2.2 megawatts, iyo waxtarka beddelka tamarta wuxuu noqon karaa mid aad u sarreeya 13%. Xitaa ka sii xiiso badan ayaa ah in la hagaajiyo cadaadiska gaaska iyo xuduudaha fiber-ka, nidaamka si fudud ayaa loo kordhin karaa ultraviolet iyo xargaha infrared, gaaritaanka hagaajinta ballaaran ee ultraviolet qoto dheer ilaa infrared.
Cilmi-baadhistani kaliya maaha mid muhiimad weyn u leh goobta aasaasiga ah ee sawir-qaadista, laakiin waxay sidoo kale u furaysaa xaalad cusub oo warshadaha iyo codsiyada. Tusaale ahaan, meelaha ay ka midka yihiin sawir-qaadista mikroskoobyada badan ee sawir-qaadista, spectroscopy-ga waqtiga-ultrafast, farsamaynta alaabta, daawada saxda ah, iyo cilmi-baarista indhaha ee ultrafast aan toos ahayn, nooca cusub ee is haysta, hufan, iyo qiimaha jaban ee isha iftiinka ultrafast wuxuu siin doonaa isticmaalayaasha qalab aan horay loo arag iyo dabacsanaan. Gaar ahaan xaaladaha u baahan heerarka soo noqnoqda ee sarreeya, awoodda ugu sarreysa iyo garaaca garaaca aadka u gaaban, tignoolajiyadani shaki la'aan waa tartan badan waxayna leedahay awood dhiirrigelin weyn marka la barbar dhigo nidaamyada aadka u weyn ee titanium-sapphire ama indhaha.
Mustaqbalka, kooxda cilmi-baaristu waxay qorsheynayaan inay sii wanaajiyaan nidaamka, sida isku-dhafka naqshadaha hadda jira ee ka kooban qaybo badan oo bilaash ah oo muuqaal ah oo ku jira fiilooyinka indhaha, ama xitaa isticmaalka hal oscillator Mamyshev si ay u beddelaan oscillator hadda iyo isku-darka amplifier, si loo gaaro miniaturization-ka iyo is-dhexgalka nidaamka. Intaa waxaa dheer, adoo la qabsanaya noocyada kala duwan ee fiilooyinka anti-resonance, soo bandhigida gaasaska firfircoon ee Raman iyo modules double double, nidaamkan ayaa la filayaa in lagu kordhiyo koox ballaaran, oo bixiya dhammaan fiber, wideband, ultrafast laser xalal badan sida ultraviolet, iftiinka muuqda iyo infrared.
Jaantuska 1. Jaantuska jaantuska ee hagaajinta laysarka garaaca
Waqtiga boostada: Meey-28-2025