Ukukhanya okubonakalayo kwe-Sub-20 femtosecondumthombo we-laser oshukunyiswayo olungisekayo
Muva nje, ithimba locwaningo lase-UK lishicilele ucwaningo olusha, limemezela ukuthi liphumelele ekwakheni ukukhanya okubonakalayo kwe-megawatt-level sub-20 femtosecond okulungisekayo okulungisekayoumthombo we-laser oshukunyisiweLo mthombo we-laser oshukunyiswayo, oshesha kakhului-fiber laseruhlelo luyakwazi ukukhiqiza ama-pulse anama-wavelength aguquguqukayo, ubude obufushane kakhulu, amandla aphezulu afinyelela kuma-nanojoule angu-39, kanye namandla aphezulu adlula ama-megawatts amabili, okuvula amathuba amasha okusetshenziswa kwemikhakha efana ne-ultrafast spectroscopy, i-biological imaging, kanye nokucubungula kwezimboni.
Isici esiyinhloko salobu buchwepheshe sisekuhlanganisweni kwezindlela ezimbili ezisezingeni eliphezulu: “i-Gain-Managed nonlinear Amplification (GMNA)” kanye ne-“Resonant Dispersive Wave (RDW) emission”. Esikhathini esidlule, ukuthola ama-pulse amafushane aguquguqukayo asebenza kahle kakhulu, ama-laser e-titanium-sapphire abizayo futhi ayinkimbinkimbi noma ama-amplifiers e-optical parametric ayevame ukudingeka. Lawa madivayisi ayengabizi nje kuphela, amakhulu, futhi kunzima ukuwanakekela, kodwa futhi ayenqunyelwe amazinga aphansi okuphindaphinda kanye namabanga okulungisa. Isixazululo se-all-fiber esakhiwe kulokhu asigcini nje ngokwenza lula ukwakheka kwesistimu kodwa futhi sinciphisa kakhulu izindleko kanye nobunzima. Sivumela ukukhiqizwa okuqondile kwe-sub-20 femtosecond, okungashintshwa kube ama-nanometer angu-400 kuya ku-700 nangaphezulu kwama-pulse anamandla aphezulu ngemvamisa yokuphindaphinda ephezulu ye-4.8 MHz. Ithimba locwaningo lithole lokhu kuphumelela ngokwakhiwa kwesistimu okuklanywe kahle. Okokuqala, basebenzise i-oscillator ye-ytterbium fiber evikelwe ngokuphelele yi-polarization esekelwe esibukweni sendandatho ye-nonlinear amplification (NALM) njengomthombo wembewu. Lo mklamo awugcini nje ngokuqinisekisa ukuzinza kwesikhathi eside kwesistimu, kodwa futhi ugwema inkinga yokuwohloka kwezithako ezigcwele ngokomzimba. Ngemva kokukhulisa amandla kanye nokucindezela kwe-pulse, ama-seed pulse afakwa esigabeni se-GMNA. I-GMNA isebenzisa i-self-phase modulation kanye nokusatshalaliswa kwe-longitudinal asymmetric gain kuma-optical fibers ukuze kufezwe ukwanda kwe-spectral futhi kukhiqizwe ama-ultrashort pulses ane-linear chirp ecishe ibe ephelele, ekugcineni acindezelwa kuma-sub-40 femtoseconds ngokusebenzisa ama-grating pairs. Ngesikhathi sesigaba sokukhiqiza i-RDW, abacwaningi basebenzise ama-nine-resonator anti-resonance hollow-core fibers azenzele wona futhi akhiqize. Lolu hlobo lwe-optical fiber lunokulahlekelwa okuncane kakhulu ebhendini ye-pump pulse kanye nesifunda sokukhanya okubonakalayo, okuvumela amandla ukuthi aguqulwe kahle kusuka ephampini aye egagasini elihlakazekile futhi kugwenywe ukuphazamiseka okubangelwa yi-high-loss resonant band. Ngaphansi kwezimo ezifanele, amandla okukhishwa kwe-dispersion wave pulse yisistimu angafinyelela ama-nanojoule angu-39, ububanzi be-pulse obufushane kakhulu bungafinyelela amasekhondi angu-13 e-femto, amandla aphezulu angaba ama-megawatts angu-2.2, kanti ukusebenza kahle kokuguqulwa kwamandla kungaba ngu-13%. Okujabulisa nakakhulu ukuthi ngokulungisa ingcindezi yegesi kanye nemingcele yefayibha, uhlelo lunganwetshwa kalula kuma-ultraviolet kanye nama-infrared bands, kufezwe ukulungiswa kwe-wideband kusuka ku-ultraviolet ejulile kuya ku-infrared.
Lolu cwaningo alugcini nje ngokuba nokubaluleka okukhulu emkhakheni oyisisekelo we-photonics, kodwa futhi luvula isimo esisha semikhakha yezimboni kanye nezicelo. Isibonelo, emikhakheni efana nokuthwebula izithombe nge-microscopy ye-multi-photon, i-spectroscopy exazululwe ngesikhathi esisheshayo, ukucubungula izinto, umuthi wokunemba, kanye nocwaningo lwe-ultrafast nonlinear optics, lolu hlobo olusha oluncane, olusebenzayo, nolungabizi kakhulu lomthombo wokukhanya we-ultrafast luzohlinzeka abasebenzisi ngamathuluzi angakaze abonwe kanye nokuguquguquka. Ikakhulukazi ezimweni ezidinga amazinga aphezulu okuphindaphinda, amandla aphezulu kanye nama-pulse amafushane kakhulu, lobu buchwepheshe ngokungangabazeki buncintisana kakhulu futhi bunamandla amakhulu okukhushulwa uma kuqhathaniswa nezinhlelo zendabuko ze-titanium-sapphire noma ze-optical parametric amplification.
Esikhathini esizayo, ithimba locwaningo lihlela ukuthuthukisa uhlelo ngokwengeziwe, njengokuhlanganisa ukwakheka kwamanje okuqukethe izingxenye eziningi ze-optical zesikhala esikhululekile zibe imicu ye-optical, noma ngisho nokusebenzisa i-oscillator eyodwa ye-Mamyshev ukuze ithathe indawo ye-oscillator yamanje kanye nenhlanganisela ye-amplifier, ukuze kufezwe i-miniaturization kanye nokuhlanganiswa kohlelo. Ngaphezu kwalokho, ngokuzivumelanisa nezinhlobo ezahlukene zemicu ye-anti-resonance, ukwethula amagesi asebenzayo e-Raman kanye namamojula okuphindaphindwa kwemvamisa, lolu hlelo kulindeleke ukuthi lwandiswe lube yibhande elibanzi, lunikeze izixazululo ze-laser ezi-all-fiber, i-wideband, i-ultrafast zezinkambu eziningi ezifana ne-ultraviolet, ukukhanya okubonakalayo kanye ne-infrared.
Umfanekiso 1. Umdwebo weskimu wokulungiswa kwe-laser evuvukile
Isikhathi sokuthunyelwe: Meyi-28-2025