Namhlanje, siya kwazisa i-laser "monochromatic" ukuya ngokugqithiseleyo - i-laser linewidth emxinwa.Ukuvela kwayo kugcwalisa izithuba kwiinkalo ezininzi zesicelo se-laser, kwaye kwiminyaka yakutshanje isetyenziswe ngokubanzi ekubhaqweni kwe-gravitational wave, i-liDAR, inzwa esasazwayo, i-high-speed coherent optical communication kunye neminye imimandla, "imishini" engenakwenziwa. igqitywe kuphela ngokuphucula amandla e-laser.
Yintoni i-laser yobubanzi obumxinwa?
Igama elithi "ububanzi bomgca" libhekisela kububanzi bomgca we-spectral we-laser kwi-domain ye-frequency, edla ngokubalwa ngokwe-half-peak ububanzi obugcweleyo be-spectrum (FWHM).Ububanzi bomgca buchatshazelwa ikakhulu yimitha ezenzekelayo ye-athomu okanye ii-ion ezinomdla, ingxolo yesigaba, ukungcangcazela komatshini we-resonator, i-jitter yobushushu kunye nezinye izinto zangaphandle.Ixabiso elincinci lobubanzi bomgca, ukuphakama kokucoceka kwe-spectrum, oko kukuthi, ngcono i-monochromaticity ye-laser.Izixhobo zeLaser ezineempawu ezinjalo zihlala zinenqanaba elincinci kakhulu okanye ingxolo yamaza kwaye ingxolo encinci kakhulu.Kwangaxeshanye, elincinane ixabiso lobubanzi bomgca welaser, kokukhona kuqina ukuhambelana okuhambelanayo, okubonakaliswa njengobude bokuhambelana okude kakhulu.
Ukuqonda kunye nokusetyenziswa kwelaser yobubanzi obumxinwa
Ukukhawulwa kububanzi benzuzo engokwemvelo yezinto zokusebenza ze-laser, phantse akunakwenzeka ukuqonda ngokuthe ngqo imveliso ye-laser yobubanzi obumxinwa ngokuthembela kwi-oscillator yendabuko ngokwayo.Ukuze uqonde ukusebenza kwe-laser yobubanzi obumxinwa, kudla ngokuba yimfuneko ukusebenzisa izihluzi, igrayiti kunye nezinye izixhobo ukunciphisa okanye ukukhetha imodyuli yelongitudinal kwi-spectrum yokuzuza, ukonyusa umnatha wokufumana umahluko phakathi kweendlela zobude, ukuze kubekho ezimbalwa okanye enye kuphela imo ye-longitudinal oscillation kwi-laser resonator.Kule nkqubo, kudla ngokuyimfuneko ukulawula impembelelo yengxolo kwimveliso ye-laser, kunye nokunciphisa ukunabisa kwemigca ye-spectral ebangelwa yi-vibration kunye nokutshintsha kweqondo lokushisa kwimeko yangaphandle;Kwangaxeshanye, inokudityaniswa nohlalutyo lwesigaba okanye i-frequency yengxolo ye-spectral density ukuqonda umthombo wengxolo kunye nokwandisa uyilo lwe-laser, ukuze kuphunyezwe imveliso ezinzileyo ye-laser yobubanzi obumxinwa.
Makhe sijonge ekufezekisweni kokusebenza kobubanzi obumxinwa kwiindidi ezahlukeneyo zeelaser.
I-laser ye-semiconductor ineenzuzo zobungakanani be-compact, ukusebenza kakuhle okuphezulu, ubomi obude kunye neenzuzo zoqoqosho.
I-Fabry-Perot (FP) i-optical resonator esetyenziswa ngokwemveliiisemiconductor lasersngokubanzi oscillates kwimo multi-longitudinal, kunye nobubanzi bomgca imveliso ibanzi ngokwentelekiso, ngoko kuyimfuneko ukunyusa impendulo optical ukufumana imveliso yomgca emxinwa ububanzi.
Ingxelo esasaziweyo (DFB) kunye ne-Distributed Bragg reflection (DBR) zimbini eziqhelekileyo zangaphakathi ze-laser ze-semiconductor ze-laser.Ngenxa yeteyithi encinci yegrayiti kunye nokukhetha okulungileyo kwe-wavelength, kulula ukufikelela kwimveliso ezinzileyo ye-firequency enye emxinwa yobubanzi bomgca.Umahluko omkhulu phakathi kwezi zakhiwo zimbini yindawo yegrayiti: i-DFB structure ikholisa ukusasaza ubume be periodic ye Bragg grating kuyo yonke i-resonator, kunye ne-resonator ye-DBR idla ngokudityaniswa ne- reflection grating structure kunye nommandla wokuzuza udityaniswe kwi-resonator. umphezulu wesiphelo.Ukongeza, ii-lasers ze-DFB zisebenzisa i-gratings edibeneyo kunye ne-low refractive index index kunye nokubonakala okuphantsi.I-laser ye-DBR zisebenzisa i-gratings yomhlaba kunye ne-high refractive index index kunye nokubonakala okuphezulu.Zombini ezi zakhiwo zinoluhlu olukhulu lwasimahla lokujonga kwaye zinokwenza ulungelelwaniso lwamaza ngaphandle kwemowudi yokutsiba kuluhlu lwee-nanometers ezimbalwa, apho i-laser ye-DBR inoluhlu olubanzi lohlengahlengiso kunendlela yokutsiba.DFB laser.Ukongeza, itekhnoloji ye-cavity yangaphandle ye-optical feedback, esebenzisa izinto zangaphandle zangaphandle ukunika ingxelo ngokukhanya okuphumayo kwe-semiconductor laser chip kwaye ukhethe i-frequency, inokuqonda kwakhona ukusebenza komgca omxinwa we-laser semiconductor.
(2) Iifayibha lasers
I-Fiber lasers inempompo ephezulu yokuguqulwa kwempompo, umgangatho olungileyo we-beam kunye nokusebenza kakuhle kokudibanisa, ezi zizihloko zophando ezishushu kwintsimi ye-laser.Kumxholo wexesha lolwazi, iilaser zefiber zihambelana kakuhle kunye neenkqubo zangoku zonxibelelwano lwefiber optical kwimarike.I-laser ye-fiber ye-frequency enye kunye neenzuzo zobubanzi bomgca omncinci, ingxolo ephantsi kunye nokuhambelana kakuhle kuye kwaba yenye yeendlela ezibalulekileyo zokuphuhliswa kwayo.
Ukusebenza kwemowudi ye-longitudinal enye yeyona nto ingundoqo ye-laser ye-fiber ukufikelela kwimveliso yobubanzi obumxinwa bomgca, ngokuqhelekileyo ngokuhambelana nesakhiwo se-resonator ye-fiber fiber laser enye inokwahlulwa ibe yi-DFB uhlobo, uhlobo lwe-DBR kunye nohlobo lwendandatho.Phakathi kwabo, umgaqo osebenzayo we-DFB kunye ne-DBR ye-fiber lasers enye-frequency iyafana ne-DFB kunye ne-DBR semiconductor lasers.
Njengoko kubonisiwe kuMfanekiso 1, i-DFB ifayibha laser kukubhala isasazwe i-Bragg grating kwifiber.Ngenxa yokuba i-wavelength esebenzayo ye-oscillator ichaphazeleka kwixesha lefiber, imodi ye-longitudinal inokukhethwa ngempendulo esasazwayo ye-grating.I-laser resonator ye-laser ye-DBR idla ngokuyilwa ngambini ye-fiber Bragg gratings, kwaye imowudi ye-longitudinal enye ikhethwa ikakhulu yi-band emxinwa kunye ne-reflectionfiber ephantsi ye-Bragg gratings.Nangona kunjalo, ngenxa yeresonator yayo ende, ulwakhiwo oluntsonkothileyo kunye nokungabikho kwendlela esebenzayo yocalucalulo, umngxuma omile okwesangqa uqhelene nokutsiba-tsiba, kwaye kunzima ukusebenza ngokuzinzileyo kwimowudi engaguqukiyo ixesha elide.
Umzobo 1, Izakhiwo ezibini eziqhelekileyo zomgca wefrikhwensi enyei-fiber lasers
Ixesha lokuposa: Nov-27-2023