Ubuchwepheshe bomthombo we-laser bokuzwa i-fiber optical Ingxenye Yesibili

Ubuchwepheshe bomthombo we-laser bokuzwa i-fiber optical Ingxenye Yesibili

2.2 Ukushanela ubude begagasi elilodwaumthombo we-laser

Ukugcwaliseka kwe-laser single wavelength sweep empeleni ukulawula izakhiwo ezibonakalayo zedivayisi ku-laserumgodi (ngokuvamile ubude begagasi obumaphakathi bomkhawulokudonsa osebenzayo), ukuze kuzuzwe ukulawula nokukhethwa kwemodi ye-oscillating longitudinal emgodini, ukuze kufezwe inhloso yokulungisa ubude begagasi obuphumayo. Ngokusekelwe kulo mgomo, kusukela ngeminyaka yawo-1980s, ukugcwaliseka kwama-laser e-fiber okuguqulekayo kwafinyelelwa ngokuyinhloko ngokufaka indawo yobuso obucwebezelayo be-laser nge-fiber diffraction grating, nokukhetha imodi yesikhala se-laser ngokuzungezisa mathupha nokulungisa i-diffraction grating. Ngo-2011, uZhu et al. kusetshenziswe izihlungi eziguqulekayo ukuze kuzuzwe okukhiphayo kwe-laser eguqulekayo ene-waveleng eyodwa enobubanzi bomugqa obuncane. Ngo-2016, i-Rayleigh linewidth compression mechanism yasetshenziswa ekucindezelweni kwe-wavelength ekabili, okusho ukuthi, ingcindezi yasetshenziswa ku-FBG ukuze kuzuzwe ukushunwa kwe-laser ye-wavelength ekabili, kanye nobubanzi bomugqa we-laser obuphumayo buqashwe ngasikhathi sinye, kutholwe uhla lokushuna lwe-wavelength lwe-3. nm. Ukukhishwa okuzinzile kwe-wavelength ekabili nobubanzi bomugqa obucishe bube ngu-700 Hz. Ngo-2017, uZhu et al. isebenzise i-graphene ne-micro-nano fiber i-Bragg grating ukwenza isihlungi esingaguquleka kalula, futhi kuhlanganiswe nobuchwepheshe bokunciphisa i-Brillouin laser, yasebenzisa umphumela we-photothermal we-graphene eduze no-1550 nm ukuze kuzuzwe ububanzi bomugqa we-laser obuphansi obungu-750 Hz kanye nesithombe esilawulwa ngokushesha futhi ukuskena okunembile kuka-700 MHz/ms ebangeni le-wavelength elingu-3.67 nm. Njengoba kuboniswe kuMfanekiso 5. Indlela yokulawula ubude begagasi engenhla ibona ngokuyisisekelo ukukhethwa kwemodi ye-laser ngokushintsha ngokuqondile noma ngokungaqondile ubude begagasi besikhungo sokudlula sedivayisi endaweni ye-laser.

I-Fig. 5 (a) Ukusethwa kokuhlola kwe-optical-controllable wavelength-I-laser ye-fiber etholakalayokanye nohlelo lokulinganisa;

(b) I-spectra ephumayo kokuphumayo 2 nokuthuthukiswa kwephampu yokulawula

2.3 Umthombo wokukhanya kwelaser emhlophe

Ukuthuthukiswa komthombo wokukhanya okumhlophe kuye kwabhekana nezigaba ezihlukahlukene ezifana nesibani se-halogen tungsten, isibani se-deuterium,I-semiconductor laserkanye nomthombo wokukhanya we-supercontinuum. Ikakhulukazi, umthombo wokukhanya we-supercontinuum, ngaphansi kwenjabulo ye-femtosecond noma i-piccosecond pulses enamandla amakhulu wesikhashana, ukhiqiza imiphumela engaqondile yemiyalo ehlukahlukene ku-waveguide, futhi i-spectrum inwetshwa kakhulu, engamboza ibhande kusukela ekukhanyeni okubonakalayo kuya eduze kwe-infrared, futhi inokuhambisana okuqinile. Ukwengeza, ngokulungisa ukuhlakazeka nokungatholakali kwe-fiber ekhethekile, i-spectrum yayo inganwetshwa ngisho nebhendi ye-infrared ephakathi. Lolu hlobo lomthombo we-laser lusetshenziswe kakhulu emikhakheni eminingi, njenge-optical coherence tomography, ukutholwa kwegesi, i-biological imaging nokunye. Ngenxa yokulinganiselwa komthombo wokukhanya kanye ne-nonlinear medium, i-spectrum yasekuqaleni ye-supercontinuum yakhiqizwa ngokuyinhloko yi-solid-state laser pumping optical glass ukuze kukhiqizwe i-supercontinuum spectrum ebangeni elibonakalayo. Kusukela lapho, i-fiber optical kancane kancane isiphenduke isikhungo esihle kakhulu sokukhiqiza i-wideband supercontinuum ngenxa ye-coefficient yayo enkulu engaqondile kanye nenkambu yemodi yokudlulisa encane. Imiphumela eyinhloko engaqondile ihlanganisa ukuxuba kwamagagasi amane, ukuguquguquka kokuguquguquka, ukuzishintsha kwesigaba somuntu siqu, ukuguquguquka kwesigaba esiphambene, ukuhlukaniswa kwe-soliton, ukuhlakazeka kwe-Raman, ukushintsha kwe-soliton self-frequency, njll., futhi ingxenye yomphumela ngamunye nayo ihlukile ngokuvumelana ne ububanzi be-pulse ye-excitation pulse kanye nokuhlakazeka kwe-fiber. Ngokuvamile, manje umthombo wokukhanya we-supercontinuum ugxile kakhulu ekuthuthukiseni amandla e-laser nokwandisa ububanzi be-spectral, futhi unake ukulawula kwayo ukuhambisana.

3 Isifinyezo

Leli phepha lifingqa futhi libuyekeze imithombo ye-laser esetshenziselwe ukusekela ubuchwepheshe bokuzwa i-fiber, okuhlanganisa i-laser yobubanzi obuncane bomugqa, i-single frequency tunable laser kanye ne-broadband white laser. Izidingo zohlelo kanye nesimo sokuthuthukiswa kwala ma-lasers emkhakheni wokuzwa ngefayibha zethulwa ngokuningiliziwe. Ngokuhlaziya izidingo zabo nesimo sokuthuthuka, kuphetha ngokuthi umthombo we-laser ofanele wenzwa yefayibha ungafinyelela okukhipha i-laser emincane kakhulu futhi ezinzile kunoma iyiphi ibhendi nanoma yisiphi isikhathi. Ngakho-ke, siqala nge-laser yobubanzi bomugqa omncane, i-laser yobubanzi bomugqa omncane oguqulekayo kanye ne-laser ekhanyayo emhlophe enomkhawulokudonsa obanzi wokuzuza, futhi sithole indlela ephumelelayo yokubona umthombo ofanele we-laser wenzwa yefayibha ngokuhlaziya ukukhula kwayo.