Itekhnoloji yomthombo welaser yokuvavanya ifayibha ye-optical Icandelo lesiBini
2.2 Ukutshayelwa kwe-wavelength enyeumthombo weleza
Ukuphunyezwa kwe-laser single wavelength sweep ngokuyintloko kukulawula iipropati zomzimba zesixhobo kwiilezai-cavity (idla ngokuba yi-central wavelength ye-operating bandwidth), ukuze kufezekiswe ulawulo kunye nokukhetha i-oscillating longitudinal mode kwi-cavity, ukuze kufezekiswe injongo yokulungisa ubude be-output wavelength. Ngokusekelwe kulo mgaqo, kwasekuqaleni kweminyaka yoo-1980, ukufezekiswa kwee-tunable fiber lasers kwafezekiswa ikakhulu ngokutshintsha ubuso bokugqibela be-reflective ye-laser nge-reflective diffraction grating, kunye nokukhetha i-laser cavity mode ngokujikeleza ngesandla kunye nokulungisa i-diffraction grating. Ngo-2011, uZhu et al. basebenzise izihluzi ezi-tunable ukuze kufezekiswe i-single-wavelength tunable laser output enobubanzi obuncinci bomgca. Ngo-2016, i-Rayleigh linewidth compression mechanism yasetyenziswa kwi-dual-wavelength compression, oko kukuthi, uxinzelelo lwasetyenziswa kwi-FBG ukuze kufezekiswe i-dual-wavelength laser tuning, kwaye i-output laser linewidth yajongwa ngaxeshanye, yafumana uluhlu lwe-wavelength tuning lwe-3 nm. I-dual-wavelength output ezinzileyo enobubanzi bomgca obumalunga ne-700 Hz. Ngo-2017, uZhu et al. Kusetyenziswe i-graphene kunye ne-micro-nano fiber Bragg grating ukwenza isihluzi esikwaziyo ukuhlengahlengiswa ngokupheleleyo, kwaye xa sidityaniswe netekhnoloji yokunciphisa i-laser yeBrillouin, kusetyenziswe isiphumo se-photothermal se-graphene kufutshane ne-1550 nm ukufezekisa ububanzi be-laser obuphantsi njenge-750 Hz kunye ne-photocontrolled fast and enembileyo scanning ye-700 MHz/ms kuluhlu lwe-wavelength ye-3.67 nm. Njengoko kubonisiwe kuMfanekiso 5. Indlela yokulawula i-wavelength engentla ngokusisiseko ifezekisa ukhetho lwe-laser mode ngokutshintsha ngokuthe ngqo okanye ngokungathanga ngqo i-passband center wavelength yesixhobo kwi-laser cavity.
Umzobo 5 (a) Useto lovavanyo lwe-wavelength elawulwayo ye-optical-i-laser yefayibha ehlengahlengiswayokunye nenkqubo yokulinganisa;
(b) Iispectra zokukhupha kwisiphumo sesi-2 ngokuphuculwa kwepompo yokulawula
2.3 Umthombo wokukhanya we-laser omhlophe
Uphuhliso lomthombo wokukhanya omhlophe luye lwadibana namanqanaba ahlukeneyo afana nesibane se-halogen tungsten, isibane se-deuterium,i-laser ye-semiconductorkunye nomthombo wokukhanya we-supercontinuum. Ngokukodwa, umthombo wokukhanya we-supercontinuum, phantsi kokuvuselelwa kwe-femtosecond okanye i-picosecond pulses enamandla e-super transient, uvelisa iziphumo ezingezizo ezilandelelanayo zemiyalelo eyahlukeneyo kwi-waveguide, kwaye i-spectrum iyanda kakhulu, enokugubungela ibhendi ukusuka ekukhanyeni okubonakalayo ukuya kufutshane ne-infrared, kwaye inokuhambelana okuqinileyo. Ukongeza, ngokulungelelanisa ukusasazeka kunye nokungahambelani kwefayibha ekhethekileyo, i-spectrum yayo inokwandiswa ukuya kwi-mid-infrared band. Olu hlobo lomthombo we-laser lusetyenziswe kakhulu kwiindawo ezininzi, ezifana ne-optical coherence tomography, ukufunyanwa kwegesi, i-biological imaging njalo njalo. Ngenxa yokuthintelwa komthombo wokukhanya kunye ne-nonlinear medium, i-supercontinuum spectrum yokuqala yaveliswa kakhulu yi-solid-state laser pumping optical glass ukuvelisa i-supercontinuum spectrum kuluhlu olubonakalayo. Ukususela ngoko, i-optical fiber iye kancinci kancinci yaba yindlela efanelekileyo yokuvelisa i-wideband supercontinuum ngenxa ye-coefficient yayo enkulu engeyiyo elandelelanayo kunye ne-small transmission mode field. Iziphumo eziphambili ezingezizo ezantsi ziquka ukuxubana kwamaza amane, ukungazinzi kokuguquguquka, ukuguquguquka kwesigaba esizimeleyo, ukuguquguquka kwesigaba esinqamlezileyo, ukwahlukana kwe-soliton, ukusasazwa kweRaman, ukutshintsha kwe-soliton self-frequency, njl.njl., kwaye umlinganiselo wesiphumo ngasinye nawo wahlukile ngokwebubanzi be-pulse ye-excitation pulse kunye nokusasazeka kwefayibha. Ngokubanzi, ngoku umthombo wokukhanya we-supercontinuum ngokuyintloko ujolise ekuphuculeni amandla e-laser kunye nokwandisa uluhlu lwe-spectral, kwaye unikele ingqalelo kulawulo lwayo lokuvumelana.
3 Isishwankathelo
Eli phepha lishwankathela kwaye liphonononga imithombo yelaser esetyenziselwa ukuxhasa itekhnoloji yokubona ifayibha, kubandakanya ilaser encinci yobubanzi, ilaser enye enokulungiseka kunye nelaser emhlophe ye-broadband. Iimfuno zesicelo kunye nemeko yophuhliso lwale laser kwicandelo lokubona ifayibha ziyaziswa ngokweenkcukacha. Ngokuhlalutya iimfuno zazo kunye nemeko yophuhliso, kugqitywa kwelokuba umthombo welaser ofanelekileyo wokubona ifayibha unokufezekisa imveliso yelaser enciphile kakhulu nezinzileyo kuyo nayiphi na ibhendi nangaliphi na ixesha. Ke ngoko, siqala ngelaser encinci yobubanzi bomgca, ilaser encinci yobubanzi bomgca enokulungiseka kunye nelaser emhlophe yokukhanya ene-wide gain bandwidth, kwaye sifumane indlela esebenzayo yokufumana umthombo welaser ofanelekileyo wokubona ifayibha ngokuhlalutya uphuhliso lwazo.
Ixesha lokuthumela: Novemba-21-2023