Iyingqayizivelei-laser esheshayoingxenye eyodwa
Izici eziyingqayizivele ze-ultrafastama-laser
Ubude be-ultra-short pulse bama-laser asheshayo bunikeza lezi zinhlelo izici ezihlukile ezizihlukanisa kumalaser we-long-pulse noma i-continuous-wave (CW). Ukuze ukhiqize i-pulse emfushane kangaka, i-wide spectrum bandwidth iyadingeka. Umumo we-pulse kanye nobude beza obumaphakathi bunquma ubuncane bomkhawulokudonsa odingekayo ukuze kukhiqizwe ama-pulse wesikhathi esithile. Ngokujwayelekile, lobu budlelwano buchazwa ngokuhambisana nomkhiqizo wesikhathi somkhawulokudonsa (TBP), osuselwe kumgomo wokungaqiniseki. I-TBP ye-Gaussian pulse inikezwa ngefomula elandelayo :TBPGaussian=ΔτΔν≈0.441
U-Δτ ubude besilinganiso sokushaya kwenhliziyo futhi u-Δv umkhawulokudonsa wemvamisa. Ngamafuphi, i-equation ibonisa ukuthi kunobudlelwane obuphambene phakathi komkhawulokudonsa we-spectrum kanye nobude be-pulse, okusho ukuthi njengoba ubude be-pulse buncipha, umkhawulokudonsa odingekayo ukukhiqiza lokho kuthinta kuyakhuphuka. Umfanekiso 1 ubonisa ubuncane bomkhawulokudonsa obudingekayo ukuze kusekelwe ubude besilinganiso sokushaya kwenhliziyo eziningana.
Umfanekiso 1: Ubuncane be-spectral bandwidth edingekayo ukuze kusekelweama-laser pulseskokungu-10 ps (okuluhlaza), 500 fs (okuluhlaza okwesibhakabhaka), kanye no-50 fs (okubomvu)
Izinselelo zobuchwepheshe zamalaser asheshayo
Umkhawulokudonsa we-spectral obanzi, amandla aphezulu, nesikhathi esifushane sokushaya kwe-lasers kufanele kulawulwe kahle ohlelweni lwakho. Imvamisa, esinye sezixazululo ezilula kakhulu kulezi zinselele ukuphuma kwe-spectrum ebanzi yama-lasers. Uma ikakhulukazi usebenzise ama-pulse amade noma ama-laser-wave-wave aqhubekayo esikhathini esidlule, isitoko sakho esikhona sezinto ezibonakalayo singase singakwazi ukukhombisa noma ukudlulisa umkhawulokudonsa ogcwele wama-pulses asheshayo.
Umkhawulo wokulimala kwe-Laser
I-Ultrafast Optics nayo inokwehluke kakhulu futhi kunzima kakhulu ukuzulazula emikhawulweni yomonakalo we-laser (LDT) uma kuqhathaniswa nemithombo ye-laser evamile. Lapho i-optics ihlinzekwai-nanosecond pulsed lasers, amanani e-LDT ngokuvamile alandelana ngo-5-10 J/cm2. Kuma-optics asheshayo, amanani alobu bukhulu cishe awazwakali, njengoba amanani e-LDT maningi amathuba okuba abe ngohlelo luka-<1 J/cm2, ngokuvamile asondele ku-0.3 J/cm2. Ukwehluka okubalulekile kwe-LDT amplitude ngaphansi kobude be-pulse obuhlukene kuwumphumela wendlela yokulimala kwe-laser esekelwe ubude be-pulse. Okwelaser nanosecond noma ngaphezului-pulsed lasers, indlela eyinhloko edala umonakalo ukushisa okushisayo. I-coating kanye ne-substrate materials of theimishini yokubonadonsa ama-photon esigameko futhi uwashise. Lokhu kungaholela ekuhlanekeni kwe-crystal lattice yezinto. Ukunwetshwa kokushisa, ukuqhekeka, ukuncibilika kanye ne-lattice strain yizindlela ezijwayelekile zokulimala kokushisa kwalokhu.imithombo laser.
Kodwa-ke, kuma-laser asheshayo, ubude be-pulse ngokwawo bushesha kunesikalo sesikhathi sokudlulisa ukushisa kusuka ku-laser kuya ku-lattice yezinto ezibonakalayo, ngakho-ke umphumela oshisayo awuyona imbangela eyinhloko yomonakalo owenziwe nge-laser. Esikhundleni salokho, amandla aphezulu e-laser esheshayo aguqula indlela yokulimala ibe izinqubo ezingaqondile njengokumuncwa kwama-photon amaningi kanye ne-ionization. Yingakho kungenakwenzeka ukuvele unciphise isilinganiso se-LDT se-nanosecond pulse kuya ku-ultrafast pulse, ngoba indlela yokulimala ngokomzimba ihlukile. Ngakho-ke, ngaphansi kwezimo ezifanayo zokusetshenziswa (isb, ubude begagasi, ubude besilinganiso sokushaya kwenhliziyo, nezinga lokuphindaphinda), idivayisi yokubona enesilinganiso esiphezulu ngokwanele se-LDT izoba idivayisi yokubona ehamba phambili yohlelo lwakho lokusebenza oluthile. Ama-Optics ahlolwe ngaphansi kwezimo ezihlukene awameleli ukusebenza kwangempela kwama-optics afanayo ohlelweni.
Umfanekiso 1:Izindlela zokulimala kwe-laser ezinobude be-pulse obuhlukene
Isikhathi sokuthumela: Jun-24-2024