Naqshadaynta waddo indhaha ah ee leysar-ka qufulan ee qaabka 66-femtosecond

Naqshadeynta waddo indhaha ah ee 66-femtosecondlaysarka qaabka xiran
Laser-kan oo ah nooca 66-femtosecond-locked mode-locked waa laser fiber ah oo leh qaab-dhismeed toosan oo leh ytterbium-doped fiber ah oo leh isbeddel aan is-dhaafsi lahayn. Wuxuu gaaraa 147 MHz habka-xiritaanka habka soo noqnoqda aasaasiga ah. Marka la hagaajiyo masaafada u dhaxaysa shabagyada, ballaca muuqaalka ah ee 39.8 nm iyo ballaca garaaca ee 66 fs ka dib marka la helo cadaadis dibadeed. Awoodda bamka sare, qufulka habka-xidhiidhka labaad iyo kan saddexaad oo leh soo noqnoqoshada ku celcelinta ee 294.1 MHz iyo 442.3 MHz ayaa la gaaraa.

Sharaxaadda waddada indhaha:
Resonator-ku wuxuu ka kooban yahay qaybaha indhaha ee labada dhinac iyo qaybta fiilada ilaalinta polarization-ka ee bartamaha. Qaybta bidix ee booska waxaa ku jira muraayad milicsi guud (M1), saxanka hirarka λ/8 (EWP), iyo rotator Faraday (FR). Isku-darka EWP iyo FR waxaa loo isticmaali karaa sidii beddele weji oo aan is-dhaafsanayn, taasoo bixinaysa eex wejiga oo aan is-dhaafsanayn, taasoo kor u qaadaysa awoodda is-bilaabista. Qaybta fiilada waxay ka kooban tahay qalab isku-dhafan oo kala-qaybinta hirarka - collimator (WDM-Collimator) ah, 62 cm ytterbium-doped polarization-protecting fiber (Yb401-PM, CORACTIVE), iyo kollimator fiber optical (Col). Faybarka faa'iidada waxaa lagu shubaa diode laser ah oo hal-qaab ah oo 976 nm ah (LD) oo leh awood bambo ugu badan oo ah 1.4 W. Qaybta booska saxda ah waxay ka kooban tahay saxan nus-hir ah (HWP), kala-qaybiye fallaadhaha polarization (PBS), lammaane shabag ah (LightSmyth T-1000-1040-3212-94), iyo muraayad milicsi guud (M2). Lammaanaha shabagga gudbinta oo leh cufnaanta xariiqda 1000 xariiq/mm waxay bixisaa magdhow kala-fidinta godadka. Masaafada u dhaxaysa labada shabag waxaa lagu hagaajin karaa marxalad. Dhererka booska xorta ah laga bilaabo isku-xidhka ilaa labada muraayadood ee milicsiga labada dhinac waa 5.5 cm iyo 6.5 cm siday u kala horreeyaan.laysarwaxay soo saartaa garaaca wadnaha si toosan oo ka soo horjeeda PBS.
Mabda'a shaqada:
Garaaca caadiga ah ee bilowga ah ee loo gudbiyo wareegga gudaha godka ayaa ka bilaabma PBS waxaana loo gudbiyaa M1. Marka hore, HWP waxay garaaca u kala qaybin doontaa laba qaybood oo orthogonal ah, ka dibna waxay geli doontaa fiber-ka indhaha ee ilaaliya polarization-ka waxayna ku faafi doontaa faasasyada degdega ah iyo kuwa gaabiska ah. Saamiga xoogga garaaca ee labada dhidib ee orthogonal waxaa lagu go'aamiyaa xagasha wareegga (θh) ee HWP. Inta lagu jiro faafinta gudaha fiber-ka indhaha, sababtoo ah saameyn aan toos ahayn, xoogga aan sinnayn ee garaaca orthogonal polarized wuxuu sababi doonaa isbeddello aan toos ahayn oo la xiriira xoogga. Muraayadda dhammaadka M1 waxay awood u siineysaa garaaca orthogonal inay laba jeer dhex maraan beddelka wejiga oo ay ku soo noqdaan fiber-ka indhaha ee ilaaliya polarization-ka. Garaaca orthogonal waxay helaan wareejin wejiga π/2 oo aan isdhaafsanayn waxayna beddelaan dhidibka indhaha ee faafinta. Is-waafajinta xawaaraha kooxeed ee u dhexeeya garaaca orthogonal polarized wuxuu horseedaa magdhowga saameynta leexashada. Ugu dambeyntii, garaaca wuxuu ururiyaa isbeddello marxaladeed oo aan toosnayn oo kala duwan wuxuuna maraa faragelin PBS. Iyada oo ah polarizer, PBS waxay u oggolaanaysaa garaaca xaaladda polarization ee ku habboon inay dhex maraan, halka inta soo hartayna ay ka muuqato godka. Habkani wuxuu door ka ciyaaraa nuugista macmal ah ee ku jirta godkan toosan.laysarka indhahaMarka masaafada labada shabag ee shabagga la sii yareeyo ilaa 3.2 mm, geeska bidix ee shabagga ayaa si weyn u qoto dheeraada. Waqtigan xaadirka ah, kala firdhinta shabaqa godka waa mid togan, waxaana la helaa tamarta hal-garaaca ugu badan ee 3.57 nJ. Raad-raaca is-xidhiidhka garaaca ee laga helo cadaadiska dibadda ee garaaca wadnaha oo leh ballac muuqaal ah oo 39.8 nm ah waxaa lagu rakibay shaqada Gaussian, taas oo ah 66 fs.