Yahlukilei-laser ekhawulezayo kakhuluinxalenye yokuqala
Iimpawu ezizodwa ze-ultrafastiileyiza
Ubude be-pulse obufutshane kakhulu bee-laser ezikhawulezayo bunika ezi nkqubo iipropati ezikhethekileyo ezizahlula kwii-laser ezinde okanye eziqhubekayo (CW). Ukuze kuveliswe i-pulse emfutshane kangaka, kufuneka i-bandwidth ye-spectrum ebanzi. Ubume be-pulse kunye nobude be-wavelength ephakathi bumisela ubuncinci be-bandwidth efunekayo ukuvelisa ii-pulse zexesha elithile. Ngokwesiqhelo, olu lwalamano luchazwa ngokwemveliso ye-time-bandwidth (TBP), ethathwe kumgaqo wokungaqiniseki. I-TBP ye-pulse yeGaussian inikwa ngale fomyula ilandelayo :TBPGaussian=ΔτΔν≈0.441
I-Δτ bubude be-pulse kwaye i-Δv bububanzi be-frequency. Ngokwenyani, i-equation ibonisa ukuba kukho ubudlelwane obuchaseneyo phakathi kwe-spectrum bandwidth kunye nobude be-pulse, oko kuthetha ukuba njengoko ubude be-pulse buncipha, ububanzi be-bandwidth obufunekayo ukuvelisa loo pulse buyanda. Umfanekiso 1 ubonisa ubukhulu be-bandwidth obufunekayo ukuxhasa ubude be-pulse obahlukeneyo.
Umfanekiso 1: Ubuncinci bebhendi ye-spectral efunekayo ukuxhasaiipulses zelaserye-10 ps (eluhlaza), i-500 fs (eluhlaza okwesibhakabhaka), kunye ne-50 fs (ebomvu)
Imingeni yobugcisa ye-ultrafast lasers
I-wide spectral bandwidth, amandla e-peak, kunye nexesha elifutshane le-pulse ye-ultrafast lasers kufuneka zilawulwe ngokufanelekileyo kwinkqubo yakho. Rhoqo, esinye sezisombululo ezilula kwezi ngxaki kukuphuma kwe-wide spectrum ye-laser. Ukuba ubusebenzisa kakhulu i-pulse ende okanye i-continuous-wave lasers ngaphambili, isitokhwe sakho esikhoyo sezinto ezibonakalayo sisenokungakwazi ukubonakalisa okanye ukudlulisa i-bandwidth epheleleyo ye-ultrafast pulses.
Umlinganiselo womonakalo we-laser
Ii-optics ezikhawulezayo kakhulu nazo zinokwahluka kakhulu kwaye kunzima ukuzisebenzisa xa kuthelekiswa nemithombo ye-laser eqhelekileyo.ii-laser ze-nanosecond pulsed, amaxabiso e-LDT adla ngokuba kulandelelwano lwe-5-10 J/cm2. Kwi-ultrafast optics, amaxabiso alolu hlobo awaziwa kangako, njengoko amaxabiso e-LDT anokuba kulandelelwano lwe-<1 J/cm2, adla ngokuba kufutshane ne-0.3 J/cm2. Utshintsho olukhulu lwe-LDT amplitude phantsi kwexesha lokubetha kwentliziyo elihlukeneyo lubangelwa yindlela yokonakala kwe-laser ngokusekelwe kwixesha lokubetha kwentliziyo. Kwi-nanosecond lasers okanye ngaphezulu.iileza ezishukumayo, indlela ephambili ebangela umonakalo kukufudumeza ngobushushu. Ingubo kunye nezinto zesiseko se-substrateizixhobo ezibonakalayokufunxwa ii-photon zesiganeko kwaye zifudumale. Oku kunokukhokelela ekugqwethekeni kwe-crystal lattice yezinto. Ukwanda kobushushu, ukuqhekeka, ukunyibilika kunye noxinzelelo lwe-lattice zezona ndlela ziqhelekileyo zomonakalo wobushushu kweziimithombo yeleza.
Nangona kunjalo, kwiilaser ezikhawulezayo, ubude be-pulse ngokwayo bukhawuleza kunexesha lokudluliselwa kobushushu ukusuka kwilaser ukuya kwi-lattice yezinto, ngoko ke isiphumo sobushushu asiyiyo imbangela ephambili yomonakalo obangelwa yilaser. Endaweni yoko, amandla aphezulu elaser ekhawulezayo aguqula indlela yomonakalo ibe ziinkqubo ezingezizo ezilandelelanayo ezifana nokufunxwa kwe-photon eninzi kunye ne-ionization. Yingakho kungenakwenzeka ukunciphisa nje umlinganiselo we-LDT we-nanosecond pulse ukuya kwe-ultrafast pulse, kuba indlela yokusebenza yomonakalo yahlukile. Ke ngoko, phantsi kweemeko ezifanayo zokusetyenziswa (umz., ubude be-wavelength, ubude be-pulse, kunye nesantya sokuphindaphinda), isixhobo se-optical esine-LDT rating ephezulu ngokwaneleyo siya kuba sesona sixhobo se-optical silungileyo kwisicelo sakho esithile. Ii-Optics ezivavanyiweyo phantsi kweemeko ezahlukeneyo azimeli ukusebenza kwangempela kwee-optics ezifanayo kwinkqubo.
Umfanekiso 1: Iindlela zomonakalo obangelwe yilaser kunye nobude bentliziyo obahlukeneyo
Ixesha leposi: Juni-24-2024