I-laser ephindaphindayo enesantya esiphezulu kakhulu

I-laser ephindaphindayo enesantya esiphezulu kakhulu

Kwihlabathi le-microscopic lonxibelelwano phakathi kokukhanya kunye nezinto, ii-ultra-high repetition rate pulses (UHRPs) zisebenza njengeerula ezichanekileyo zexesha - zijikeleza ngaphezulu kwe-1 billion times ngomzuzwana (1GHz), zibamba iminwe ye-molecular yeeseli zomhlaza kwi-spectral imaging, zithwala idatha enkulu kunxibelelwano lwe-optical fiber, kwaye zilinganisela ii-wavelength coordinates zeenkwenkwezi kwiiteleskopu. Ingakumbi ekutsibeni komlinganiselo wokufumanisa we-lidar, ii-terahertz ultra-high repetition rate pulsed lasers (100-300 GHz) ziba zizixhobo ezinamandla zokungena kumaleko wokuphazamiseka, ziphinda zibumbe imida ye-three-dimensional perception ngamandla okuguqulwa kwe-spatiotemporal kwinqanaba le-photon. Okwangoku, ukusebenzisa ii-microstructures zokwenziwa, ezifana nee-micro-ring cavities ezifuna ukuchaneka kokucubungula i-nanoscale ukuvelisa ukuxubana kwamaza amane (FWM), yenye yeendlela eziphambili zokufumana ii-ultra-high repetition rate optical pulses. Izazinzulu zigxile ekusombululeni iingxaki zobunjineli ekucutshungulweni kwezakhiwo ezi-ultra-fine, ingxaki yokulungisa i-frequency ngexesha lokuqalisa i-pulse, kunye nengxaki yokusebenza kakuhle kokuguqulwa emva kokuveliswa kwe-pulse. Enye indlela kukusebenzisa iifayibha ezingezizo ezomgca ophezulu kwaye sisebenzise isiphumo sokungazinzi kwe-modulation okanye isiphumo se-FWM ngaphakathi kwe-laser cavity ukuze sivuselele ii-UHRP. Okwangoku, sisadinga "i-time shaper" enobuchule ngakumbi.

Inkqubo yokuvelisa i-UHRP ngokufaka ii-pulses ezikhawulezayo ukuze kuvuselelwe isiphumo se-FWM esisasazekayo ichazwa njenge-"ultrafast ignition". Ngokungafaniyo nesicwangciso se-microring cavity esikhankanyiweyo apha ngasentla esifuna ukupompa okuqhubekayo, ukulungiswa ngokuchanekileyo kokunciphisa ukulawula ukuvelisa ii-pulse, kunye nokusetyenziswa kweendaba ezingezizo ezilandelelanayo kakhulu ukunciphisa umda we-FWM, olu "i-ignition" luxhomekeke kwiimpawu zamandla aphezulu ee-pulses ezikhawulezayo ukuze kuvuselelwe ngokuthe ngqo i-FWM, kwaye emva "kokucima", kufezekiswe i-UHRP ezizixhasayo.

Umfanekiso 1 ubonisa indlela eyintloko yokufezekisa ukuzilungiselela kwe-pulse ngokusekelwe ekuvuseleleni kwe-pulse yembewu ngokukhawuleza kwe-dissipative fiber ring cavities. I-pulse yembewu emfutshane efakwe ngaphandle (ixesha le-T0, i-repetition frequency F) isebenza "njengomthombo wokutsha" ukuvuselela intsimi ye-pulse enamandla aphezulu ngaphakathi kwe-dissipation cavity. I-intracellular gain module isebenza ngokubambisana ne-spectral shaper ukuguqula amandla e-pulse yembewu abe yimpendulo ye-spectral efana ne-comb ngokulawula okudibeneyo kwindawo yexesha. Le nkqubo idlula kwimida yokupompa okuqhubekayo kwendabuko: i-pulse yembewu iyacima xa ifikelela kumda we-FWM wokusasaza, kwaye i-dissipation cavity igcina imeko yokuzilungiselela ye-pulse ngokulinganisela okuguquguqukayo kwe-gain and loss, kunye ne-pulse repetition frequency ye-Fs (ehambelana ne-intrinsic frequency FF kunye ne-period T ye-cavity).

Olu phononongo lukwaqhube nokuqinisekiswa kwethiyori. Ngokusekelwe kwiiparameter ezamkelweyo kulungiselelo lovavanyo kunye ne-1psi-laser ye-pulse ekhawulezayo kakhuluNjengentsimi yokuqala, ukulinganisa amanani kwenziwe kwinkqubo yokuguquka kwexesha le-pulse kunye nokuphindaphinda ngaphakathi kwe-laser cavity. Kufunyaniswe ukuba i-pulse idlule kwizigaba ezintathu: ukwahlukana kwe-pulse, i-pulse periodic oscillation, kunye nokusasazwa kwe-pulse ngokulinganayo kuyo yonke i-laser cavity. Esi siphumo samanani sikwaqinisekisa ngokupheleleyo iimpawu zokuzilungiselela zei-pulse laser.

Ngokuqalisa isiphumo sokuxuba amaza amane ngaphakathi kwe-dissipative fiber ring cavity ngokusebenzisa i-ultrafast seed pulse ignition, ukuveliswa kokuzilungiselela kunye nokugcinwa kwee-sub-THZ ultra-high repetition frequency pulses (ukuphuma okuzinzileyo kwamandla e-0.5W emva kokucima kwembewu) kufezekiswe ngempumelelo, kubonelela ngohlobo olutsha lomthombo wokukhanya kwintsimi ye-lidar: Ukuphindaphinda kwayo kwinqanaba le-sub-THZ kunokuphucula isisombululo selifu lenqaku ukuya kwinqanaba le-millimeter. Isici sokuzigcina se-pulse self-sustaining sinciphisa kakhulu ukusetyenziswa kwamandla enkqubo. Isakhiwo se-all-fiber siqinisekisa ukusebenza okuzinzileyo okuphezulu kwi-1.5 μm eye safety band. Sijonge kwixesha elizayo, le teknoloji kulindeleke ukuba iqhubele phambili ukuvela kwe-lidar efakwe kwisithuthi ukuya kwi-miniaturization (ngokusekwe kwii-MZI micro-filters) kunye nokufunyanwa komgama omde (ukwandiswa kwamandla ukuya kwi-> 1W), kwaye ihlengahlengise ngakumbi kwiimfuno zokuqonda zeendawo ezintsonkothileyo ngokusebenzisa i-multi-wavelength coordinated ignition kunye nolawulo olukrelekrele.