Namhlanje, siza kwazisa i-laser "eyodwa" kwi-laser ebanzi kakhulu - i-laser encinci. Ukuvela kwayo kuzalisa izikhewu kwiindawo ezininzi zokusetyenziswa kwe-laser, kwaye kwiminyaka yakutshanje isetyenziswa kakhulu ekufumaneni amaza adonsela phantsi komhlaba, i-liDAR, i-distributed sensing, unxibelelwano lwe-optical oluhambelanayo olukhawulezayo kunye nezinye iindawo, "umsebenzi" ongenakugqitywa kuphela ngokuphucula amandla e-laser.
Yintoni i-laser enobubanzi obumxinwa?
Igama elithi “ububanzi bomgca” libhekisa kububanzi bomgca we-spectral we-laser kwi-frequency domain, edla ngokulinganiswa ngokwe-half-peak full width of the spectrum (FWHM). Ububanzi bomgca buchaphazeleka kakhulu yi-spontaneous radiation yee-athomu ezivuselelwe okanye ii-ions, ingxolo yesigaba, ukungcangcazela koomatshini kwe-resonator, i-temperature jitter kunye nezinye izinto zangaphandle. Okukhona ixabiso lobubanzi bomgca lincinci, kokukhona ubunyulu be-spectrum buphezulu, oko kukuthi, kokukhona i-monochromaticity ye-laser ingcono. Ii-Laser ezineempawu ezinjalo zihlala zine-phase okanye i-frequency ingxolo encinci kakhulu kunye nengxolo encinci kakhulu. Kwangaxeshanye, okukhona ixabiso lobubanzi bomgca lincinci le-laser, kokukhona i-coherence ehambelanayo iqina, ebonakaliswa njengobude bokungqamana obude kakhulu.
Ukuphunyezwa kunye nokusetyenziswa kwe-laser yobubanzi obumxinwa
Incitshiswe bububanzi bokufumana i-inherent yento esebenzayo ye-laser, phantse akunakwenzeka ukuqonda ngokuthe ngqo imveliso ye-narrow linewidth laser ngokuxhomekeka kwi-oscillator yendabuko ngokwayo. Ukuze kufezekiswe ukusebenza kwe-narrow linewidth laser, kudla ngokufuneka kusetyenziswe izihluzi, ii-grating kunye nezinye izixhobo ukunciphisa okanye ukukhetha i-longitudinal modulus kwi-gain spectrum, ukwandisa umahluko we-net gain phakathi kwe-longitudinal modes, ukuze kubekho i-longitudinal mode oscillation embalwa okanye enye kuphela kwi-laser resonator. Kule nkqubo, kudla ngokufuneka ukulawula impembelelo yengxolo kwi-laser output, kunye nokunciphisa ukwanda kwemigca ye-spectral ebangelwa kukungcangcazela kunye notshintsho lobushushu kwindawo yangaphandle; Kwangaxeshanye, inokudityaniswa nohlalutyo lwe-phase okanye i-frequency noise spectral density ukuqonda umthombo wengxolo kunye nokwenza ngcono uyilo lwe-laser, ukuze kufezekiswe i-stable output ye-narrow linewidth laser.
Makhe sijonge indlela esebenza ngayo i-linewidth encinci kwiindidi ezahlukeneyo zeelaser.
Iileyiza ze-semiconductor zineengenelo zobukhulu obuncinci, ukusebenza kakuhle okuphezulu, ubomi obude kunye neenzuzo zoqoqosho.
I-resonator ye-Fabry-Perot (FP) esetyenziswa kwi-optical resonator yendabukoiileyiza ze-semiconductorngokubanzi iyatshintshatshintsha kwimowudi ye-multi-longitudinal, kwaye ububanzi bomgca wemveliso bubanzi kakhulu, ngoko ke kuyimfuneko ukwandisa impendulo ye-optical ukuze kufumaneke umphumo wobubanzi bomgca omxinwa.
I-Distributed feedback (DFB) kunye ne-Distributed Bragg reflection (DBR) ziilaser ezimbini eziqhelekileyo ze-internal optical feedback semiconductor lasers. Ngenxa ye-grating pitch encinci kunye nokukhetha okuhle kwe-wavelength, kulula ukufikelela kwi-stable single-frequency narrow linewidth output. Umahluko ophambili phakathi kwezi zakhiwo zimbini yindawo ye-grating: isakhiwo se-DFB sihlala sisasaza isakhiwo se-periodic se-Bragg grating kuyo yonke i-resonator, kwaye i-resonator ye-DBR idla ngokwenziwa yi-reflection grating structure kunye ne-gain region edityaniswe kumphezulu wokugqibela. Ukongeza, ii-DFB lasers zisebenzisa ii-embedded gratings ezine-low refractive index contrast kunye ne-low reflectivity. Ii-DBR lasers zisebenzisa ii-surface gratings ezine-high refractive index contrast kunye ne-high reflectivity. Zombini izakhiwo zinoluhlu olukhulu lwe-free spectral kwaye zinokwenza i-wavelength tuning ngaphandle kwe-mode jump kuluhlu lwee-nanometers ezimbalwa, apho i-DBR laser inoluhlu olubanzi lwe-tuning kune-I-laser ye-DFBUkongeza, iteknoloji yempendulo ye-optical yangaphandle, esebenzisa izinto ze-optical zangaphandle ukuphendula ukukhanya okuphumayo kwe-semiconductor laser chip kunye nokukhetha i-frequency, inokwenza umsebenzi wobubanzi obuncinci be-linewidth ye-semiconductor laser.
(2) Iilaser zefayibha
Iilaser zefayibha zinamandla okuguqula iipompo, umgangatho olungileyo wemitha kunye nokusebenza kakuhle kokudibanisa, ezi zezona zihloko zishushu zophando kwicandelo lelaser. Kwimeko yexesha lolwazi, iilaser zefayibha zihambelana kakuhle neenkqubo zonxibelelwano lwefayibha ye-optical ezikhoyo kwimarike. Ilaser yefayibha ye-single-frequency enezibonelelo zobubanzi bomgca omxinwa, ingxolo ephantsi kunye nokuhambelana okuhle iye yaba yenye yeendlela ezibalulekileyo zophuhliso lwayo.
Ukusebenza kwendlela enye ye-longitudinal yeyona nto iphambili kwi-fiber laser ukuze kufezekiswe imveliso yobubanzi bomgca omxinwa, ngokwesakhiwo se-resonator, i-single frequency fiber laser inokwahlulwa ibe yi-DFB type, i-DBR type kunye ne-ring type. Phakathi kwazo, umgaqo wokusebenza kwe-DFB kunye ne-DBR single-frequency fiber lasers ufana nowe-DFB kunye ne-DBR semiconductor lasers.
Njengoko kubonisiwe kuMfanekiso 1, i-DFB fiber laser iza kubhala i-Bragg grating esasazwe kwi-fiber. Ngenxa yokuba ubude bomda we-oscillator buchaphazeleka lixesha le-fiber, i-longitudinal mode inokukhethwa ngempendulo esasazwe ye-grating. I-laser resonator ye-DBR laser idla ngokwenziwa zi-fiber Bragg gratings ezimbini, kwaye i-single longitudinal mode ikhethwa kakhulu yi-small band kunye ne-low reflectivity fiber Bragg gratings. Nangona kunjalo, ngenxa ye-resonator yayo ende, isakhiwo esiyinkimbinkimbi kunye nokungabikho kwendlela esebenzayo yokwahlulahlula amaza, i-ring-shaped cavity ithambekele ekutsibeni i-mode, kwaye kunzima ukusebenza ngokuzinzileyo kwi-longitudinal mode eqhubekayo ixesha elide.
Umfanekiso 1, Izakhiwo ezimbini eziqhelekileyo ezithe ngqo ze-frequency enyeiileyiza zefayibha
Ixesha lokuthumela: Novemba-27-2023