Rov ua duagigahertzpulses nrog ib tus neeg xim thiab cov duab qhib lub peev xwm tshiab hauv ultrafast imaging thiab laser ua.
Ib pab neeg tshawb fawb los ntawm University of Tokyo thiab Saitama University hauv Nyij Pooj tau tsim cov txheej txheem kho qhov muag tshiab hu ua "spectrum shuttle". Cov txheej txheem tuaj yeem ua ib txhij tsim GHz tawg ntawm pulses thiab tsim lawv cov spatial profiles.
Cov tiam thiab shaping ntawm repetitive pulses tuav zoo cog lus rau ntau yam kev siv, nrog rau kev yees duab ceev, laser ua, thiab acoustic yoj tiam. Gigahertz (GHz) pulses nrog lub sijhawm ntawm ~0.01 ~ ~ 10 nanoseconds yog qhov tseem ceeb tshwj xeeb hauv kev pom cov xwm txheej ceev ceev thiab txhim kho kev ua haujlwm ntawm laser.
Tam sim no, thaum txoj hauv kev tsim cov GHz tawg ntawm pulses muaj nyob rau hauv kev lag luam, cov kev cov nyom tseem nyob-xws li cov khoom siv hluav taws xob tsis muaj zog, tsis zoo ntawm cov mem tes ntu, thiab qhov nyuaj ntawm cov tshuab uas twb muaj lawm. Tsis tas li ntawd, shaping lub spatial profile ntawm txhua GHz tawg pulse yog txwv vim tsis txaus cov lus teb ntawm spatial teeb modulators.
Txhawm rau daws cov teeb meem no, pab pawg tshawb fawb tau hais los saum toj no tau tsim lub tswv yim tshiab.
Txoj hauv kev muaj cov kab rov tav dispersing ultrashort pulses los ntawm diffraction grating, siv cov tsom iav sib luag los cais cov pulses mus rau qhov sib txawv wavelengths spatially. Cov vertically aligned pulses no muaj peev xwm ua tau tus kheej spatial modulated siv lub spatial light modulator. Cov txiaj ntsig modulated pulses, nrog rau lub sijhawm sib txawv hauv GHz ntau yam, tsim cov spectrally cais GHz bursts ntawm pulses, txhua tus muaj cov duab tshwj xeeb hauv nws qhov profile.
Cov txheej txheem tau tshaj tawm kom ua tiav GHz tawg pulses nrog cov kev hloov pauv tsis sib xws hauv wavelength thiab lub sijhawm luv. Nws qhia txog kev tsim ntawm spatial profiles nrog rau txoj hauj lwm hloov thiab peak splitting. Daim ntawv thov ntawm txoj kev mus rau ultrafast spectral imaging qhia nws muaj peev xwm mus ntes cov dynamics ntawm txawv wavelength bands ib txhij.
Cov txheej txheem ua kom pom kev nrawm nrawm hauv sub-nanosecond rau nanosecond lub sijhawm ntsuas, ua kom muaj kev soj ntsuam ceev ceev, tsis yog rov ua dua. Nws cov ntawv thov muaj peev xwm suav nrog nthuav tawm qhov tsis paub txog qhov tshwm sim ultrafast thiab saib xyuas cov txheej txheem ntawm lub cev ceev hauv ib puag ncig kev lag luam. Lub peev xwm los ua tus kheej zoo li GHz pulses kuj tseem muaj txiaj ntsig zoo hauv kev ua haujlwm laser thiab kev kho laser.
Qhov tseem ceeb, pab neeg txoj kev tsim kho tshiab tau ua rau muaj kev tsim qauv tsim thiab txhim kho kev txav mus los, ua rau nws tsim nyog siv rau hauv cov chaw tshawb fawb tshawb fawb thiab ntau yam kev lag luam technologies.
Keitaro Shimada, Ph.D. tus neeg sib tw hauv Department of Bioengineering ntawm lubUniversity of Tokyo, hais tias, "Peb qhov tshwj xeeb kho qhov muag qauv tso cai rau kev tswj hwm ntawm ultrashort pulses nrog peb-dimensional optical txoj kev, uas ua rau qhov tsis tau pom dua los ntawm kev ua haujlwm ntawm GHz bursts."
Nws hais ntxiv, "Spectrum shuttling muab ntau yam ntawm GHz tawg pulses nrog lub sijhawm sib txawv ntawm 10 picoseconds mus rau 10 nanoseconds. Kuv ntseeg tias cov ntawv thov raws li peb cov thev naus laus zis rau ntau lub hom phiaj, suav nrog cov ntshav, hlau, thiab cov hlwb, yuav ua kom muaj kev tshawb fawb tshawb pom. thiab thev naus laus zis tshiab hauv kev lag luam thiab tshuaj. "
Cov thev naus laus zis tshiab no qhib txoj hauv kev rau kev nce qib ultrafast imaging, nrog rau kev cuam tshuam rau kev tshawb fawb thiab kev lag luam. Nws lub peev xwm los tsim ib txhij thiab tsim kev tawg ntawm GHz pulses qhia txog ntau yam cuab yeej rau kev kawm ceev phenomena thiab txhim kho cov txheej txheem laser.
