Femtosecond lasers muaj nuj nqi raws li muaj tseeb heev "kho qhov muag tshiab," ua si ib qho kev phais mob IREPLALEY, kev kho mob meej, thiab kev tshawb fawb pom tseeb. Tshwj xeeb hauv 2 μm wavessength band, cov lasers npog ntau cov qib hluav taws xob hluav taws xob hluav taws xob lub zog ntawm ntau amino cov ntaub so ntswg. Thiaj li, lawv daim ntawv thov cov kev xav tau tshwj xeeb yog qhov ceev ceev hauv teb zoo li tsis yog - nws yog xim hlau siv.
Txawm li cas los xij, kev ua kom nrov femtosecond noob lasers kom muaj zog siab yog qhov nyuaj. Qhov kev sib tw tseem ceeb nyob rau hauv kev sib cuam tshuam hnyav ntawm kev sib cuam tshuam ntawm femtosecond pulse high optical kev siv kho tshiab thiab lub zog nruab nrab thaum lub caij nyoog. Tsis tas li ntawd, kev cuam tshuam hnyav ntawm tus nqi siab yuav txwv tsis taus, ua rau cov mem tes ua rau tsis zoo, thiab txawm tias muaj kev puas tsuaj kho qhov muag. Cov kev pab uas twb muaj lawm feem ntau ua haujlwm chirged pulse amplification (CPA) thev naus laus zis Txawm li cas los xij, cov kab ke no yog cov nyom, kim, thiab loj. Yog li ntawd, lub peev xwm los tshem tawm cov kauj ruam dav thiab ua kom tiav "
Femtosecond Laser Amplifier raws li "EXPRETE" SCF
Recently, researchers including Wang Jianlei and Zhao Yongguang from the State Key Laboratory of Crystal Materials at Shandong University proposed an innovative B-integral (nonlinear phase shift) management strategy. By employing a discrete single-crystal fiber (SCF) configuration in the power amplification stage, they successfully achieved direct amplification of 2 μm femtosecond pulses at high repetition rates. The system achieved femtosecond laser output with an average power exceeding 56 W at a 75.45 MHz repetition rate, demonstrating exceptionally high optical-to-optical extraction efficiency (>55%) thiab ze {{{1} -} TSUASG BARS ZOO (M² <1.2). Txoj kev tshawb fawb pom tau tias qhov teeb meem SCF tau txo qis kev ua haujlwm tsis sib xws thiab ua rau muaj kev cuam tshuam loj thiab ua kom muaj txiaj ntsig thaum ua kom sov. Qhov yooj yim, kev cog lus, thiab ua tau zoo rau ambification ntawm MHZ rau KHUDASS qhov nruab nrab / ncov zog tshiab thiab nthuav qhia cov kev thov nonlinear.
Tus qauv ntawm no Ho: YAG Scf Amplification system, raws li muaj nyob hauv daim duab 1, muaj cov roj Laser, muaj peb supplifier) {1% doped ho: yag SCFs). Qhov chaw ua haujlwm laser tau muab qhov nruab nrab ntawm 0.45 W ntawm 2091 nm, nrog lub cev nqaij tawv ntawm 360 FS thiab ib qho rov ua dua ntawm 75.45 MHz. Tom qab dhau mus dhau ntawm cov theem preamplifier thiab Tandem scf zog amplifier theem, lub zog nruab nrab nce mus rau 56.3 W, thiab tus neeg sab hauv lub cev dav dav rau 778 FS. Qhov kev pom tseeb thiab kev hloov kho ib ntus ntawm cov kev ua kom tiav ntawm cov mem tes los ntawm tag nrho cov kev ua kom sov tau pom hauv daim duab 2.
Daim duab 1 Schematic ntawm Ho: YAG Scf Amplification system
Daim duab 2 Spectral thiab Anchalal Evolution ntawm Ho: YAG Scf Amplification System
Hauv kev ua kom zoo tshaj plaws, kev ua kom nrov dua ntawm kev ua tsis taus thiab nqaj distortes los ntawm tus kheej {}}}}} Cov theem tsis muaj zog no. Qhov kev txwv no confines kem / fiber ntau cov kev ua haujlwm rau kev ua haujlwm tsuas yog nyob rau hauv cov picosecond ntau yam. Qhov no yuav tsum tau chirged pulse amplification (CPA) cov txheej txheem raws li kev ncab ncab thiab compression. Thaum lub sijhawm kho qhov muag chirged pulse detification (oPCPA) tuaj yeem ua tiav Milliwatt tus nqi ntawm KHU}}}}} pa mi} kev daws teeb meem hauv nruab nrab hluav taws xob thiab kev ua tau zoo. Thaum fiber-} Based CPA muaj cov txiaj ntsig zoo hauv nruab nrab lub zog thiab cov khoom siv hluav taws xob siab, lub zog loj los ntawm cov tsis muaj kev cuam tshuam thiab kev puas tsuaj. Yog li ntawd, cov cuab yeej uas twb muaj lawm uas twb muaj lawm ua kom tiav rau peb qhov kev ua tau zoo: Lub zog, rov ua dua tus nqi, thiab mem tes dav. Txoj kev kawm no tam sim no tawm tsam ib qho Hws Hws: YAG Scf Series kev teeb tsa. Los ntawm segmentally cuam tshuam kev txuas ntxiv ua ke ntawm nonlinear theem ua haujlwm, nws txo tag nrho b}} sib xyaw ua ke ntawm lub amplification. Qhov kev sib tw no sib npaug ntev nrog tus kheej-}}}}}} mitigating tus kheej-}}}}}} Tsom cov kev pheej hmoo. Los ntawm kev ua haujlwm ib qho kev sib cais ib qho {{{}} ua tiav cov kev sib tw ntawm Nonstal Fiber ntau hauv 2 μm femtosecond laser ua kom yooj yim. Nws ua tiav cov kev sib txig tseem ceeb hauv kev ua haujlwm laser los ntawm kev ua tau zoo heev, qauv qauv yooj yim ua kom zoo dua qub.
Qhov kev ua haujlwm no tau qhia txog cov txheej txheem ncaj qha rau 2 μm femtosecond lasers, muab cov kab ke tshiab rau kev txhim kho cov kev cog lus, ua tau zoo, thiab ultrasfast lasers. Kev siv zog yav tom ntej yuav ua kev xaiv mem tes xaiv thiab tshaj tawm-} pa mem tes thiab sheetter pulse dav.
