Lub teeb ci ultraviolet siab dua siab

Lub teeb ci ultraviolet siab dua siab

Cov txheej txheem tom qab-compression ua ke nrog ob-xim teb tsim cov teeb pom kev zoo ultraviolet siab heev
Rau cov ntawv thov Tr-ARPES, txo qhov wavelength ntawm lub teeb tsav tsheb thiab ua kom muaj feem ntau ntawm cov roj ionization yog cov txhais tau zoo kom tau txais cov flux siab thiab cov harmonics siab. Hauv cov txheej txheem ntawm kev tsim cov harmonics siab nrog ib-dhau siab-repetition zaus, qhov zaus ob npaug lossis peb npaug txoj kev yog qhov feem ntau siv los ua kom muaj txiaj ntsig zoo ntawm cov harmonics siab. Nrog kev pab los ntawm kev nias tom qab-pulse, nws yooj yim dua los ua tiav qhov siab tshaj plaws ntawm lub zog ceev uas xav tau rau kev tsim cov harmonic siab los ntawm kev siv lub teeb tsav luv dua, yog li kev ua haujlwm ntau dua tuaj yeem tau txais dua li ntawm lub zog tsav ntev dua.

Ob chav grating monochromator ua tiav qhov kev them nyiaj rau pem hauv ntej
Kev siv ib qho diffractive element hauv monochromator ua rau muaj kev hloov pauv hauvkho qhov muagtxoj kev radially hauv lub beam ntawm ultra-luv pulse, tseem hu ua lub pulse forward tilt, ua rau lub sijhawm ncab. Tag nrho lub sijhawm sib txawv rau qhov chaw diffraction nrog lub diffraction wavelength λ ntawm qhov kev txiav txim diffraction m yog Nmλ, qhov twg N yog tag nrho cov kab grating ci ntsa iab. Los ntawm kev ntxiv qhov thib ob diffractive element, lub tilted pulse pem hauv ntej tuaj yeem rov qab tau, thiab monochromator nrog lub sijhawm ncua sijhawm them nyiaj tuaj yeem tau txais. Thiab los ntawm kev kho qhov kev pom ntawm ob lub monochromator Cheebtsam, lub grating pulse shaper tuaj yeem hloov kho kom raug them nyiaj rau qhov kev sib kis ntawm cov hluav taws xob harmonic siab. Siv lub sijhawm-nqis sijhawm them nyiaj tsim, Lucchini et al. tau qhia txog qhov ua tau ntawm kev tsim thiab piav qhia txog ultra-luv monochromatic extreme ultraviolet pulses nrog lub pulse dav ntawm 5 fs.
Pab pawg tshawb fawb Csizmadia ntawm ELE-Alps Facility hauv European Extreme Light Facility tau ua tiav qhov spectrum thiab pulse modulation ntawm lub teeb ultraviolet siv ob lub grating time-delay compensation monochromator hauv qhov zaus rov ua dua siab, kab teeb ci harmonic siab. Lawv tsim cov harmonics siab dua siv lub tsavlasernrog rau qhov rov ua dua ntawm 100 kHz thiab ua tiav qhov dav ultraviolet pulse dav ntawm 4 fs. Txoj haujlwm no qhib cov cib fim tshiab rau kev sim sijhawm daws teeb meem hauv qhov chaw ELI-ALPS.

Lub teeb ci ultraviolet uas muaj zaus rov ua dua ntau zaus tau siv dav hauv kev kawm txog electron dynamics, thiab tau pom tias muaj kev siv dav hauv kev tshawb fawb attosecond spectroscopy thiab microscopic imaging. Nrog rau kev nce qib tas mus li thiab kev tsim kho tshiab ntawm kev tshawb fawb thiab thev naus laus zis, lub teeb ci ultraviolet uas muaj zaus rov ua dua ntau zaus tau siv dav hauv kev kawm txog electron dynamics, thiab tau pom tias muaj kev cia siab dav hauv kev siv attosecond spectroscopy thiab microscopic imaging.lub teeb citab tom nce qib mus rau hauv kev coj ntawm qhov rov ua dua zaus siab dua, photon flux siab dua, photon zog siab dua thiab lub zog luv dua. Yav tom ntej, kev tshawb fawb txuas ntxiv ntawm qhov rov ua dua zaus siab ultraviolet teeb pom kev zoo yuav txhawb nqa lawv daim ntawv thov hauv electronic dynamics thiab lwm yam kev tshawb fawb. Tib lub sijhawm, kev ua kom zoo dua thiab kev tswj hwm thev naus laus zis ntawm qhov rov ua dua zaus siab ultraviolet teeb pom kev zoo thiab nws daim ntawv thov hauv cov txheej txheem sim xws li angular resolution photoelectron spectroscopy kuj tseem yuav yog qhov tseem ceeb ntawm kev tshawb fawb yav tom ntej. Tsis tas li ntawd, lub sijhawm-daws teeb meem attosecond transient absorption spectroscopy thev naus laus zis thiab lub sijhawm tiag tiag microscopic imaging thev naus laus zis raws li qhov rov ua dua zaus siab ultraviolet teeb pom kev zoo kuj xav tias yuav raug kawm ntxiv, tsim thiab siv kom ua tiav qhov tseeb siab attosecond time-resolved thiab nanospace-resolved imaging yav tom ntej.