Itekhnoloji yomthombo weLaser yokuva i-fiber optical iCandelo leSibini
2.2 Ukutshayela ubude obunyeumthombo laser
Ukuphunyezwa kwe-laser single wavelength tshayela ngokuyimfuneko kukulawula iipropathi ezibonakalayo zesixhobo kwilaseri-cavity (ngokuqhelekileyo i-wavelength embindini we-bandwidth yokusebenza), ukwenzela ukuba kuphunyezwe ulawulo kunye nokukhethwa kwendlela ye-oscillating longitudinal kwi-cavity, ukuze kuphunyezwe injongo yokulungisa ubude be-wavelength.Ngokusekwe kulo mgaqo-siseko, kwangeminyaka yoo-1980s, ukufezekiswa kweelaser zefiber eziqhutywayo zaphunyezwa ikakhulu ngokususa isiphelo sobuso belaser ngegrayiti ebonakalisayo, kunye nokukhetha imowudi yomgodi welaser ngokujikeleza ngesandla kunye nokulungelelanisa igrayiti ye-diffraction.Kwi-2011, uZhu et al.zisetyenzisiwe izihluzi eziguqulekayo ukuphumeza imveliso yelaser enobude obunye obunobubanzi obumxinwa.Ngo-2016, iRayleigh linewidth compression mechanism yasetyenziswa kuxinzelelo lwe-wavelength ephindwe kabini, oko kukuthi, uxinzelelo lwasetyenziswa kwi-FBG ukuphumeza i-laser tuning ye-laser ene-wavelength, kwaye i-laser ephumayo yayijongwe ngaxeshanye, ifumana i-wavelength tuning range ye-3. nm.Imveliso ezinzileyo yobude obubini obunobubanzi bomgca obumalunga ne-700 Hz.Kwi-2017, uZhu et al.isetyenzisile igraphene kunye nemicro-nano fiber Bragg grating ukwenza isihluzo esinokuhanjiswa yonke into, kwaye idityaniswe ne-Brillouin laser yokunciphisa itekhnoloji, isebenzise isiphumo sefotothermal yegraphene kufutshane ne-1550 nm ukuphumeza i-laser linewidth esezantsi njenge-750 Hz kunye nefoto elawulwa ngokukhawuleza kwaye ukuskena ngokuchanekileyo kwe-700 MHz / ms kuluhlu lwe-wavelength ye-3.67 nm.Njengoko kuboniswe kuMzobo 5. Indlela yokulawula i-wavelength engentla iqonda ngokusisiseko ukhetho lwemowudi ye-laser ngokutshintsha ngokuthe ngqo okanye ngokungathanga ngqo i-passband center wavelength yesixhobo kwi-laser cavity.
Isazobe sesi-5 (a) Ukusetwa kovavanyo lwe-optical-controllable wavelength-i-laser yefiber enokuqhutywakunye nenkqubo yokulinganisa;
(b) Umboniso wemveliso kwimveliso yesi-2 kunye nokwandiswa kwempompo yokulawula
2.3 Umthombo wokukhanya kwelaser emhlophe
Ukuphuhliswa komthombo wokukhanya okumhlophe kuye kwafumana izigaba ezahlukeneyo ezifana nesibane se-halogen tungsten, isibane se-deuterium,semiconductor laserkunye nomthombo wokukhanya we-supercontinuum.Ngokukodwa, umthombo wokukhanya we-supercontinuum, phantsi kwe-excitation ye-femtosecond okanye i-piccosecond pulses enamandla amakhulu adlulayo, uvelisa iziphumo ezingabonakaliyo kwii-odolo ezahlukeneyo kwi-waveguide, kwaye i-spectrum yandiswa kakhulu, enokuthi igubungele ibhendi ukusuka ekukhanyeni okubonakalayo ukuya kufuphi ne-infrared, kwaye inomathelwano olomeleleyo.Ukongeza, ngokulungelelanisa ukusasazeka kunye nokungahambelani kwefiber ekhethekileyo, i-spectrum yayo inokwandiswa nakwi-middle-infrared band.Olu hlobo lomthombo we-laser lusetyenziswe kakhulu kwiinkalo ezininzi, ezifana ne-optical coherence tomography, ukufumanisa igesi, ukucinga ngebhayoloji njalo njalo.Ngenxa yokuncitshiswa komthombo wokukhanya kunye ne-nonlinear medium, i-spectrum yokuqala ye-supercontinuum yaveliswa ikakhulu yi-solid-state laser pumping glass optical ukuvelisa i-supercontinuum spectrum kuluhlu olubonakalayo.Ukusukela ngoko, i-fiber optical ngokuthe ngcembe ibe yeyona ndlela ibalaseleyo yokuvelisa i-wideband supercontinuum ngenxa ye-coefficient yayo enkulu engahambelaniyo kunye nendledlana encinci yokuhambisa.Iziphumo eziphambili ezingabonakaliyo zibandakanya ukuxuba amaza amane, ukungazinzi kwe-modulation, i-self-phase modulation, i-modulation ye-cross-phase, i-soliton yokwahlula, i-Raman yokusabalalisa, i-soliton self-frequency shift, njl. Ububanzi be-pulse ye-excitation pulse kunye nokusasazeka kwefiber.Ngokubanzi, ngoku umthombo wokukhanya we-supercontinuum ujolise ikakhulu ekuphuculeni amandla e-laser kunye nokwandisa uluhlu lwe-spectral, kwaye ubeke ingqalelo ekulawuleni ukuhambelana kwayo.
3 Isishwankathelo
Eli phepha lishwankathela kwaye liphonononga imithombo yelaser esetyenziselwa ukuxhasa itekhnoloji yokubona ifayibha, kubandakanywa nelaser emxinwa yobubanzi bomgca, i-laser enye etshintshwayo yokutshintshwa kunye ne-broadband emhlophe yelaser.Iimfuno zokusetyenziswa kunye nobume bophuhliso bezi lasers kwinkalo yefiber sensing ziziswa ngokweenkcukacha.Ngokuhlalutya iimfuno zabo kunye nesimo sophuhliso, kugqitywa ukuba umthombo welaser ofanelekileyo we-fiber sensing unokufezekisa i-ultra-namxinano kunye ne-ultra-stable output ye-laser kulo naliphi na iqela kunye naliphi na ixesha.Ke ngoko, siqala ngomgca omxinwa wobubanzi belaser, i-laser yobubanzi obunobubanzi obunokutyibilika kunye nokukhanya okumhlophe kwelaser ene-bandwidth ebanzi, kwaye sifumanise indlela esebenzayo yokufumana owona mthombo welaser ofanelekileyo wokuva ifayibha ngokuhlalutya uphuhliso lwabo.
Ixesha lokuposa: Nov-21-2023