A. Lub tswv yim ntawm ultrafast lasers
Cov lasers ceev heev feem ntau yog hais txog cov lasers uas raug xauv hom uas siv los tso tawm cov pulses luv luv, piv txwv li, cov pulses ntawm femtosecond lossis picosecond ntev. Lub npe tseeb dua yuav yog ultrashort pulse laser. Ultrashort pulse lasers yuav luag yog mode-locked lasers, tab sis qhov cuam tshuam hloov pauv kuj tseem tuaj yeem tsim cov pulses luv luv.
B. Hom laser ceev heev
1. Ti-sapphire lasers, feem ntau Kerr lens hom-xauv, tuaj yeem tsim cov pulses luv li 5 fs hauv lub sijhawm. Lawv lub zog tso zis nruab nrab feem ntau yog ob peb puas milliwatts, nrog rau cov nqi rov ua dua ntawm, hais tias, 80MHz thiab kaum ntawm femtoseconds lossis tsawg dua, thiab cov sijhawm pulse ntawm kaum ntawm femtoseconds lossis tsawg dua, ua rau muaj lub zog siab heev. Tab sis titanium-sapphire lasers xav tau lub teeb pumping los ntawm qee lub teeb ntsuab lasers, uas ua rau lawv nyuaj dua thiab kim dua.
2. Muaj ntau yam diode-pumped lasers raws li, piv txwv li, ytterbium-doped (siv lead ua los yog iav) lossis chromium-doped laser crystals, uas feem ntau siv SESAM passive mode-locking. Txawm hais tias lub sijhawm pulse ntawm diode-pumped lasers tsis luv npaum li lub sijhawm pulse ntawm titanium-sapphire lasers, diode-pumped lasers tuaj yeem npog thaj chaw dav dav hauv cov nqe lus ntawm lub sijhawm pulse, pulse repetition rate, thiab lub zog nruab nrab (saib hauv qab no).
3. Cov laser fiber uas ua los ntawm cov iav fiber uas muaj cov khoom tsis tshua muaj kuj tseem yuav raug kaw hom tsis siv neeg, piv txwv li, siv kev sib hloov polarization tsis sib xws lossis SESAM. Lawv muaj tsawg dua li cov laser loj hauv qhov nruab nrab ntawm lub zog, tshwj xeeb tshaj yog lub zog siab tshaj plaws, tab sis tuaj yeem yooj yim ua ke nrog cov amplifiers fiber. Tsab xov xwm ntawm hom-xauv fiber lasers muab cov ntsiab lus ntxiv.
(4) hom-xauv diode lasers tuaj yeem yog cov khoom siv sib xyaw lossis sab nraud qhov chaw diode lasers, thiab tuaj yeem ua haujlwm, passive lossis sib xyaw hom-xauv. Feem ntau, hom-xauv diode lasers ua haujlwm ntawm qhov siab (ob peb txhiab megahertz) pulse repetition rate ntawm lub zog nruab nrab pulse.
Cov oscillators laser ceev ceev tuaj yeem yog ib feem ntawm cov tshuab laser ceev ceev, uas kuj tseem tuaj yeem suav nrog lub amplifier ceev ceev (xws li lub amplifier fiber optic) kom nce lub zog siab tshaj plaws thiab lub zog tso zis nruab nrab.
Lub sijhawm tshaj tawm: Lub Rau Hli-20-2023