Isilinganiso esiphezulu sokuphindaphinda i-laser ye-pulsed

Isilinganiso esiphezulu sokuphindaphinda i-laser ye-pulsed

Ezweni elincane lokusebenzisana phakathi kokukhanya nodaba, ama-ultra-high repetition rate pulses (UHRPs) asebenza njengababusi besikhathi abanembile - azungeza izikhathi ezingaphezu kwesigidigidi ngomzuzwana (1GHz), ethwebula imigxivizo yeminwe yamangqamuzana omdlavuza emfanekisweni we-spectral, ephethe inani elikhulu ledatha ekuxhumaneni kwe-optical fiber ekuxhumaneni kwe-wapesbread . Ikakhulukazi ekukhuphukeni kobukhulu bokutholwa kwe-lidar, i-terahertz izinga eliphezulu lokuphindaphinda izinga le-pulsed lasers (100-300 GHz) aba amathuluzi anamandla okungena isendlalelo sokugxambukela, amise kabusha imingcele yokubona kwezinhlangothi ezintathu ngamandla okukhohlisa we-spatiotemporal ezingeni le-photon. Njengamanje, ukusebenzisa ama-microstructures okwenziwa, njengama-micro-ring cavities adinga ukunemba kokucubungula kwe-nanoscale ukuze kukhiqizwe i-four-wave mixing (FWM), ingenye yezindlela eziyinhloko zokuthola i-ultra-high repetition rate optical pulses. Ososayensi bagxile ekuxazululeni izinkinga zobunjiniyela ekucutshungulweni kwezakhiwo ezicwebe kakhulu, inkinga yokushuna imvamisa ngesikhathi sokuqaliswa kokushaya kwenhliziyo, kanye nenkinga yokuguqulwa kokusebenza kahle ngemuva kokukhiqizwa kwe-pulse. Enye indlela ukusebenzisa imicu engaqondile kakhulu nokusebenzisa umthelela wokuguquguquka kokuguquguquka noma umphumela we-FWM ngaphakathi kwendawo ye-laser ukujabulisa ama-UHRP. Kuze kube manje, sisadinga “umbumbi wesikhathi” ochwepheshile.

Inqubo yokukhiqiza i-UHRP ngokujova ama-pulses asheshayo ukuze kujabulise umphumela we-FWM oqothulayo ichazwa ngokuthi "ukuthungela okusheshayo". Ihlukile ohlelweni olushiwo ngenhla lwe-artificial microring cavity oludinga ukupompa okuqhubekayo, ukulungiswa okunembile kokukhipha ukuze ulawule ukukhiqizwa kwe-pulse, kanye nokusetshenziswa kwemidiya engaqondile kakhulu ukwehlisa umkhawulo we-FWM, lokhu "kubasa" kuncike ezicini zamandla aphezulu ama-pulses asheshayo ukuze avuse i-FWMtion ngokuqondile, futhi ngemva "Ukucisha i-AchieHRP".

Umfanekiso 1 ubonisa indlela ewumnyombo yokufeza ukuzihlela kwe-pulse ngokususelwe ekusaseni kwe-ultrafast seed pulse ye-dissipative fibre ring cavities. I-ultrashort seed pulse ejovwe ngaphandle (inkathi engu-T0, imvamisa yokuphindaphinda F) isebenza "njengomthombo wokuthungela" ukuze ijabulise inkambu ye-pulse yamandla aphezulu ngaphakathi kwendawo yokulahla. I-intracellular gain module isebenza ngokubambisana ne-spectral shaper ukuguqula amandla e-pulse yembewu ibe impendulo ye-spectral emise okwekama ngokusebenzisa ukulawulwa okuhlangene esizindeni se-time-frequency. Le nqubo inqamula imikhawulo yokumpompa okuqhubekayo okungokwesiko: i-pulse yembewu iyavaleka lapho ifinyelela embundwini we-FWM yokuhlakazeka, futhi i-cavity ye-disipation igcina isimo esizihlelayo se-pulse ngokusebenzisa ibhalansi eguquguqukayo yokuzuza nokulahlekelwa, imvamisa yokuphindaphinda kokushaya okungu-Fs (okuhambisana nemvamisa ye-FF yangaphakathi kanye nenkathi ye-T).

Lolu cwaningo luphinde lwenze ukuqinisekiswa kwethiyori. Ngokusekelwe kumapharamitha amukelwe ekusetheni kokuhlola kanye ne-1psi-ultrafast pulse lasernjengenkambu yokuqala, ukulingiswa kwezinombolo kwenziwa ngenqubo yokuziphendukela kwemvelo yesizinda sesikhathi se-pulse kanye nemvamisa ngaphakathi kwendawo ye-laser. Kwatholakala ukuthi ukushaya kwenhliziyo kudlule ezigabeni ezintathu: ukuhlukaniswa kwe-pulse, i-pulse periodic oscillation, kanye nokusatshalaliswa kweyunifomu ye-pulse kuwo wonke umgodi we-laser. Lo mphumela wezinombolo futhi uqinisekisa ngokugcwele izici zokuzihlela ze-i-pulse laser.

Ngokuqalisa umphumela wokuxuba wamagagasi amane ngaphakathi kwendandatho ye-fiber echithayo ngokusebenzisa ukuthungela kwe-ultrafast seed pulse, isizukulwane esizihlelayo kanye nokugcinwa kwe-sub-THZ ultra-high repetition frequency pulses (okukhipha okuzinzile kwamandla angu-0.5W ngemva kokucisha imbewu) kufinyelelwe ngempumelelo, ukuhlinzeka uhlobo olusha lwendawo yokukhanya ye-THZ: ukulungiswa kwamafu kuya ezingeni lemilimitha. Isici esizisekelayo sokushaya kwenhliziyo sinciphisa kakhulu ukusetshenziswa kwamandla esistimu. Isakhiwo se-fiber yonke siqinisekisa ukusebenza kokuzinza okuphezulu kubhendi yokuphepha kwamehlo engu-1.5 μm. Uma sibheka esikhathini esizayo, lobu buchwepheshe bulindeleke ukuthi buqhubekisele phambili ukuvela kwesiliva esifakwe emotweni maqondana ne-miniaturization (ngokusekelwe kuzihlungi ezincane ze-MZI) kanye nokutholwa kwebanga elide (ukunwetshwa kwamandla ukuya ku-> 1W), futhi kuqhubeke nokuzivumelanisa nezimfuneko zombono wezindawo eziyinkimbinkimbi ngokusebenzisa ukuthungela okuhlanganisiwe kwamaza amaningi kanye nokulawulwa okuhlakaniphile.