Uyilo lwendlela ebonakalayo ye-66-femtosecondi-laser etshixiwe kwimowudi
Le laser ye-66-femtosecond mode-locked yilaser yefayibha ye-ytterbium egcina i-all-polarization ene-non-reciprocal phase shifter. Ifikelela kwi-147 MHz fundamental frequency mode-locking. Ngokulungisa umgama phakathi kwe-gratings, ububanzi be-spectral obuyi-39.8 nm kunye nobubanzi be-pulse obuyi-66 fs emva koxinzelelo lwangaphandle lufunyenwe. Xa amandla aphezulu epompo, i-second-order kunye ne-third-order harmonic mode-locking ene-repetition frequency ye-294.1 MHz kunye ne-442.3 MHz ziyafezekiswa.
Inkcazo yendlela yokujonga:
I-resonator ineendawo ze-optical ze-spatial kumacala omabini kunye nenxalenye ye-fiber egcina i-polarization embindini. Inxalenye yendawo yasekhohlo ibandakanya isibuko sokubonakalisa ngokupheleleyo (M1), ipleyiti ye-λ/8 wave (EWP), kunye ne-Faraday rotator (FR). Indibaniselwano ye-EWP kunye ne-FR ingasetyenziswa njenge-non-reciprocal phase shifter, inika i-non-reciprocal phase bias, ngaloo ndlela iphucula amandla okuziqala. Inxalenye ye-fiber inesixhobo esidibeneyo se-custom wavelength division multiplexing - collimator (WDM-Collimator), i-62 cm ytterbium-doped polarization-maintaining fiber (Yb401-PM, CORACTIVE), kunye ne-optical fiber collimator (Col). Ifayibha yokugawula ipompelwa yi-single-mode 976 nm laser diode (LD) enamandla aphezulu epompo ye-1.4 W. Inxalenye yendawo yasekunene inepleyiti yesiqingatha-samaza (HWP), i-polarization beam splitter (PBS), i-grating pair (LightSmyth T-1000-1040-3212-94), kunye nesipili esipheleleyo sokubonakalisa (M2). Isibini sokubonakalisa esinoxinano lomgca we-1000 lines/mm sibonelela ngembuyekezo yokusasazwa kwe-intra-cavity. Umgama phakathi kwezi gratings zimbini unokulungiswa ngesigaba. Ubude besithuba esikhululekileyo ukusuka kwi-collimator ukuya kwizipili ezibini zokubonakalisa kumacala omabini yi-5.5 cm kunye ne-6.5 cm ngokulandelanayo.ilezaikhupha iipulses ngendlela ethe tyaba ukusuka kwi-PBS.
Umgaqo wokusebenza:
I-pulse yokuqala eqhelekileyo edluliselwa nge-intracavity loop iqala kwi-PBS ize idluliselwe kwi-M1. Ekuqaleni, i-HWP iya kuyicola i-pulse ibe ziinxalenye ezimbini ze-orthogonal, ize ingene kwi-polarization-preserving optical fiber ize isasazeke kwi-fast and slow axes. Umlinganiselo wobunzulu bee-pulses kwi-orthogonal axes ezimbini umiselwa yi-rotation angle (θh) ye-HWP. Ngexesha lokusasazeka ngaphakathi kwi-optical fiber, ngenxa yeziphumo ezingezizo zomgca, ubunzulu obungalinganiyo bee-orthogonal polarized pulses buya kubangela utshintsho lwe-nonlinear phase olunxulumene noxinzelelo. Isibuko sokugqibela i-M1 senza ukuba ii-orthogonal pulses zidlule kwi-phase shifter kabini kwaye zibuyele kwi-polarization-preserving optical fiber. Ii-orthogonal pulses zifumana i-π/2 non-reciprocal phase shift kwaye zitshintshisane ne-propagation optical axis. Ukungafani kwesantya seqela phakathi kwee-orthogonal polarized pulses kukhokelela ekuhlawuleni isiphumo sokuphambuka. Okokugqibela, i-pulse iqokelela utshintsho oluhlukeneyo lwe-nonlinear phase kwaye iphazamiseke kwi-PBS. Njenge-polarizer, i-PBS ivumela ukuba ii-pulses ze-polarization state ezifanelekileyo zidlule, ngelixa ezinye zibonakaliswa ngaphandle komngxuma. Le nkqubo idlala indima ye-absorber yokwenziwa egcwala kakhulu kule mngxuma i-linear.i-laser yokukhanyaXa umgama we-grating pair uncitshiswa ngakumbi ukuya kwi-3.2 mm, umda wasekhohlo we-spectrum uba mkhulu kakhulu. Ngeli xesha, i-cavity net dispersion ilungile, kwaye amandla aphezulu e-single-pulse angama-3.57 nJ afunyenwe. I-pulse self-correlation trace efunyenwe ngokucinezela kwangaphandle kwe-pulse enobubanzi be-spectral obuyi-39.8 nm ifakelwe ngumsebenzi weGaussian, oyi-66 fs.
Ixesha leposi: Februwari-25-2026