Ukukhanya okubonakalayo kwe-Sub-20 femtosecondumthombo we-laser we-pulsed osebenzayo
Muva nje, ithimba labacwaningi elivela e-UK lishicilele ucwaningo olusha, limemezela ukuthi lithuthukise ngempumelelo izinga lokukhanya elibonakalayo le-megawatt sub-20 femtosecond ebonakalayoumthombo we-laser we-pulsed. Lo mthombo we-laser we-pulsed, i-ultrafasti-fiber laserIsistimu iyakwazi ukukhiqiza ama-pulses anobude obungashintshwa, ubude besikhathi esifushane kakhulu, amandla afinyelela kuma-nanojoules angama-39, namandla aphezulu angaphezu kwama-megawatts ama-2, okuvula amathuba okufaka isicelo esisha emikhakheni efana ne-ultrafast spectroscopy, imaging biological, kanye nokucutshungulwa kwezimboni.
Okugqama kakhulu kwalobu buchwepheshe kusekuhlanganisweni kwezindlela ezimbili eziphambili: “Gain-Managed nonlinear Amplification (GMNA)” kanye “neResonant Dispersive Wave (RDW) emission”. Esikhathini esidlule, ukuze kutholwe ama-ultrashshort pulses anjalo asebenza kahle kakhulu, amalaser e-titanium-sapphire abizayo futhi ayinkimbinkimbi noma ama-optical parametric amplifiers ayevame ukudingeka. Lawa madivayisi abengagcini nje kuphela eqolo, emkhulu, futhi kunzima ukuwanakekela, kodwa futhi akhawulelwe ngamanani aphansi okuphindaphinda nobubanzi bokushuna. Isixazululo se-fiber esithuthukisiwe ngalesi sikhathi asigcini nje ngokwenza lula ukwakheka kwesistimu kodwa futhi kunciphisa kakhulu izindleko nokuba yinkimbinkimbi. Inika amandla ukukhiqizwa okuqondile kwe-sub-20 femtosecond, kuguquleka kuma-nanometers angama-400 kuye kwangama-700 nangale kwama-pulses anamandla aphezulu ngemvamisa yokuphindaphinda okuphezulu okungu-4.8 MHz. Ithimba locwaningo lizuze lokhu kugqama ngesakhiwo sesistimu esiklanywe kahle. Okokuqala, basebenzise imodi evala i-polarization-preserving ngokugcwele ekhiywe i-ytterbium fibre oscillator esekelwe esibukweni sendandatho yokukhulisa i-nonlinear (NALM) njengomthombo wembewu. Lo mklamo awuqinisekisi nje kuphela ukuzinza kwesikhathi eside kwesistimu, kodwa futhi ugwema inkinga yokuwohloka kwama-absorber agcwele ngokomzimba. Ngemuva kokwandiswa kwangaphambili kanye nokucindezelwa kwe-pulse, ama-pulses embewu angeniswa esigabeni se-GMNA. I-GMNA isebenzisa ukuzishintsha kwesigaba sokuzishintsha kanye nokusatshalaliswa kwenzuzo ye-asymmetric ye-longitudinal kuma-optical fibers ukuze ifinyelele ukunwetshwa kwe-spectral futhi ikhiqize ama-ultrashort pulses acishe aphelele ngokutshiyoza komugqa, agcina ecindezelwe ukuze abe kuma-sub-40 femtoseconds ngokusebenzisa amapheya e-grating. Ngesikhathi sesigaba sesizukulwane se-RDW, abacwaningi basebenzise imicu eyakhiwe yona ngokwayo futhi bakha imicu eyisishiyagalolunye ene-resonance anti-resonance hollow-core. Lolu hlobo lwefiber optical lunokulahlekelwa okuphansi kakhulu ebhendini yepompo ye-pulse kanye nendawo yokukhanya ebonakalayo, okuvumela amandla ukuthi aguqulwe ngokuphumelelayo ukusuka kupompo ukuya kumagagasi ahlakazekile futhi kugwenywe ukuphazamiseka okubangelwa ibhande elikhalayo lokulahlekelwa okukhulu. Ngaphansi kwezimo ezifanele, ukuphuma kwamandla okuhlakazeka kwe-wave wave ngohlelo kungafinyelela kuma-nanojoules angama-39, ububanzi obufushane kakhulu be-pulse bungafinyelela kuma-femtoseconds angu-13, amandla aphakeme angaba ama-megawatts angu-2.2, futhi ukusebenza kahle kokuguqulwa kwamandla kungase kufinyelele ku-13%. Okujabulisa nakakhulu ukuthi ngokulungisa ingcindezi yegesi kanye nemingcele yefiber, isistimu inganwetshwa kalula kumabhande e-ultraviolet kanye ne-infrared, ifinyelele ukucushwa kwe-wideband kusuka ku-ultraviolet ejulile kuya kwi-infrared.
Lolu cwaningo alugcini nje ngokubamba ukubaluleka okubalulekile emkhakheni oyisisekelo wezithombe, kodwa futhi luvula isimo esisha semikhakha yezimboni neyokusebenza. Isibonelo, emikhakheni efana ne-multi-photon microscopy imaging, i-spectroscopy exazululwe ngokushesha kakhulu, ukucubungula izinto ezibonakalayo, umuthi onembile, kanye nocwaningo lwe-optics olungaqondile, lolu hlobo olusha oluhlangene, olusebenzayo, nolubiza kancane lomthombo wokukhanya osheshayo luzohlinzeka abasebenzisi ngamathuluzi angakaze abonwe kanye nokuguquguquka. Ikakhulukazi ezimeni ezidinga amazinga aphezulu okuphindaphinda, amandla aphezulu kanye nama-ultra-short pulses, lobu buchwepheshe ngokungangabazeki bunokuncintisana kakhulu futhi bunamandla amakhulu okuphromotha uma kuqhathaniswa ne-titanium-sapphire yendabuko noma amasistimu okukhulisa ipharamitha obonakalayo.
Esikhathini esizayo, ithimba locwaningo lihlela ukuqhubeka nokuthuthukisa uhlelo, njengokuhlanganisa izakhiwo zamanje eziqukethe izingxenye eziningi ze-optical space-free zibe ama-optical fibers, noma ngisho nokusebenzisa i-oscillator eyodwa ye-Mamyshev esikhundleni se-oscillator yamanje kanye nenhlanganisela ye-amplifier, ukuze kuzuzwe miniaturization kanye nokuhlanganiswa kohlelo. Ukwengeza, ngokuzivumelanisa nezinhlobo ezahlukene zemicu ye-anti-resonance, ukwethula ama-Raman amagesi asebenzayo kanye namamojula wokuphindaphinda kabili, lolu hlelo kulindeleke ukuthi lunwetshwe lube yibhande elibanzi, linikeze izixazululo ze-laser ze-fiber, i-wideband, i-ultrafast ye-ultrafast emikhakheni eminingi efana ne-ultraviolet, ukukhanya okubonakalayo kanye ne-infrared.
Umfanekiso 1. Umdwebo wohlelo lokulungiswa kwe-laser pulsed
Isikhathi sokuthumela: May-28-2025