Okuhlukilei-laser esheshayo kakhuluingxenye yokuqala
Izakhiwo ezihlukile ze-ultrafastama-laser
Ubude besikhathi sokushaya kwenhliziyo obufushane kakhulu bama-laser asheshayo bunikeza lezi zinhlelo izakhiwo ezihlukile ezizihlukanisa nama-laser adonsa umoya isikhathi eside noma ama-continuous-wave (CW). Ukuze kukhiqizwe ukushaya kwenhliziyo okufushane kangaka, kudingeka umkhawulokudonsa we-wide spectrum. Ukuma kwenhliziyo kanye nobude besikhathi obuphakathi kunquma umkhawulokudonsa omncane odingekayo ukukhiqiza ukushaya kwenhliziyo kwesikhathi esithile. Ngokuvamile, lobu budlelwano buchazwa ngokomkhiqizo we-time-bandwidth (TBP), osuselwa esimisweni sokungaqiniseki. I-TBP ye-Gaussian pulse inikezwa ngale ndlela elandelayo:TBPGaussian=ΔτΔν≈0.441
I-Δτ ubude besikhathi sokushaya kwenhliziyo kanti i-Δv ubude besikhathi sokushaya kwenhliziyo. Empeleni, lesi sibalo sibonisa ukuthi kukhona ubudlelwano obuphambene phakathi kwe-spectrum bandwidth kanye nobude besikhathi sokushaya kwenhliziyo, okusho ukuthi njengoba ubude besikhathi sokushaya kwenhliziyo buncipha, ububanzi besikhathi obudingekayo ukuze kukhiqizwe lobo bunzima buyanda. Isibalo 1 sibonisa ububanzi besikhathi obuncane obudingekayo ukuze kusekelwe ubude besikhathi obuhlukahlukene bokushaya kwenhliziyo.
Umfanekiso 1: Umkhawulokudonsa omncane we-spectral odingekayo ukusekelaukushaya kwe-laserkwama-ps ayi-10 (oluhlaza), ama-fs angu-500 (oluhlaza okwesibhakabhaka), kanye nama-fs angu-50 (obomvu)
Izinselele zobuchwepheshe zama-laser asheshayo
I-wide spectral bandwidth, amandla aphezulu, kanye nobude be-pulse obufushane bama-laser asheshayo kumele kuphathwe kahle ohlelweni lwakho. Ngokuvamile, esinye sezixazululo ezilula zalezi zinselele ukukhipha kwe-wide spectrum yama-laser. Uma usebenzise kakhulu ama-pulse amade noma ama-continuous-wave lasers esikhathini esidlule, isitokwe sakho esikhona sezingxenye ze-optical singase singakwazi ukubonakalisa noma ukudlulisa i-bandwidth ephelele yama-pulse asheshayo.
Umkhawulo womonakalo we-laser
Ama-optics e-Ultrafast nawo anezindlela ezihluke kakhulu futhi ezinzima kakhulu zokulawula imingcele yomonakalo we-laser (LDT) uma kuqhathaniswa nemithombo ye-laser evamile. Uma kunikezwa ama-opticsama-laser e-nanosecond pulsed, amanani e-LDT ngokuvamile aphakathi kuka-5-10 J/cm2. Kuma-optics asheshayo, amanani alolu hlobo lobukhulu awaziwa nhlobo, njengoba amanani e-LDT cishe engaphansi kuka-1 J/cm2, ngokuvamile asondele ku-0.3 J/cm2. Ukwehluka okuphawulekayo kwe-LDT amplitude ngaphansi kwezikhathi ezahlukene zokushaya kwenhliziyo kuwumphumela wendlela yokulimala kwe-laser ngokusekelwe esikhathini sokushaya kwenhliziyo. Kuma-laser e-nanosecond noma ngaphezulu.ama-laser ashukunyiswayo, indlela eyinhloko ebangela umonakalo ukushisa okushisa. Izinto zokumboza kanye ne-substrate zeamadivayisi opticalkumunca ama-photon athintekile bese uwashisa. Lokhu kungaholela ekuphazamisekeni kwe-crystal lattice yezinto. Ukwanda kokushisa, ukuqhekeka, ukuncibilika kanye nokucindezeleka kwe-lattice kuyizindlela ezivamile zokulimala kokushisa zaleziimithombo ye-laser.
Kodwa-ke, kuma-laser asheshayo, ubude be-pulse ngokwayo bushesha kunesilinganiso sesikhathi sokudluliselwa kokushisa kusuka ku-laser kuya ku-lattice yezinto ezibonakalayo, ngakho-ke umphumela wokushisa awuyona imbangela eyinhloko yomonakalo obangelwa yi-laser. Esikhundleni salokho, amandla aphezulu e-laser ashesha aguqula indlela yomonakalo ibe yizinqubo ezingezona eziqondile ezifana nokumuncwa kwe-photon eminingi kanye ne-ionization. Yingakho kungenakwenzeka ukunciphisa isilinganiso se-LDT se-nanosecond pulse sibe se-ultrafast pulse, ngoba indlela yomonakalo engokwenyama ihlukile. Ngakho-ke, ngaphansi kwezimo ezifanayo zokusetshenziswa (isb. ubude be-wavelength, ubude be-pulse, kanye nesilinganiso sokuphindaphinda), idivayisi ye-optical enesilinganiso se-LDT esiphezulu ngokwanele izoba idivayisi ye-optical engcono kakhulu yesicelo sakho esithile. Ama-Optics ahlolwe ngaphansi kwezimo ezahlukene awameleli ukusebenza kwangempela kwama-optics afanayo ohlelweni.
Umfanekiso 1: Izindlela zomonakalo obangelwe yi-laser ngezikhathi ezahlukene zokushaya kwenhliziyo
Isikhathi sokuthunyelwe: Juni-24-2024