Hloov cov mem tes ceev ntawm super-muaj zog ultrashort laser

Hloov cov mem tes ceev ntawm lubsuper muaj zog ultrashort laser

Super ultra-luv lasers feem ntau xa mus rau laser pulses nrog mem tes dav ntawm kaum thiab pua pua ntawm femtoseconds, ncov lub hwj chim ntawm terawatts thiab petawatts, thiab lawv lub teeb tsom siv ntau tshaj 1018 W / cm2. Super ultra luv luv laser thiab nws generated super radiation qhov chaw thiab siab zog particle qhov chaw muaj ib tug ntau ntawm daim ntawv thov nqi nyob rau hauv ntau yam kev tshawb fawb cov lus qhia xws li siab zog physics, particle physics, plasma physics, nuclear physics thiab astrophysics, thiab cov zis ntawm scientific. Cov txiaj ntsig kev tshawb fawb tuaj yeem ua haujlwm rau kev lag luam high-tech, kev noj qab haus huv, ib puag ncig lub zog thiab kev tiv thaiv kev ruaj ntseg hauv tebchaws. Txij li thaum lub invention ntawm chirped mem tes amplification technology nyob rau hauv 1985, qhov tshwm sim ntawm lub ntiaj teb no thawj yeej watt.laserNyob rau hauv 1996 thiab ua tiav ntawm lub ntiaj teb thawj 10-tsib watt laser nyob rau hauv 2017, lub hom phiaj ntawm super ultra-luv laser yav dhau los tau tsuas yog ua kom tiav "lub teeb hnyav tshaj plaws". Nyob rau hauv xyoo tas los no, cov kev tshawb fawb tau pom tias nyob rau hauv cov xwm txheej ntawm kev tswj hwm super laser pulses, yog tias cov mem tes kis ceev ntawm super ultra-luv laser tuaj yeem tswj tau, nws yuav ua rau ob zaug qhov tshwm sim nrog ib nrab ntawm kev siv zog hauv qee qhov kev siv lub cev, uas xav tau. kom txo cov nplai ntawm super ultra-luvcov khoom siv laser, tab sis txhim kho nws cov nyhuv hauv high-field laser physics thwmsim.

Distortion ntawm mem tes pem hauv ntej ntawm ultra-muaj zog ultrashort laser
Txhawm rau kom tau txais lub zog siab tshaj plaws nyob rau hauv kev txwv lub zog, lub mem tes dav yog txo mus rau 20 ~ 30 femtoseconds los ntawm kev nthuav dav qhov nce bandwidth. Lub zog pulse ntawm tam sim no 10-beak-watt ultra-luv laser yog hais txog 300 joules, thiab qhov kev puas tsuaj tsawg ntawm cov compressor grating ua rau cov nqaj aperture feem ntau ntau dua 300 hli. Lub pulse beam nrog 20 ~ 30 femtosecond mem tes dav thiab 300 mm aperture yog ib qho yooj yim mus nqa lub spatiotemporal coupling distortion, tshwj xeeb tshaj yog distortion ntawm mem tes pem hauv ntej. Daim duab 1 (a) qhia txog qhov sib cais-ntev-ntev ntawm lub mem tes pem hauv ntej thiab theem pem hauv ntej uas tshwm sim los ntawm lub luag haujlwm ntawm lub nqaj dispersion, thiab qhov qub qhia tau hais tias "spatio-temporal qaij" txheeb ze rau tom kawg. Lwm qhov yog qhov nyuaj "curvature of space-time" los ntawm lub lens system. FIG. 1 (b) qhia txog cov teebmeem ntawm qhov zoo tagnrho mem tes pem hauv ntej, inclined mem tes pem hauv ntej thiab khoov mem tes pem hauv ntej ntawm lub spatio-temporal distortion ntawm lub teeb teb ntawm lub hom phiaj. Yog li ntawd, lub teeb tsom teeb pom kev zoo tau txo qis heev, uas tsis yog qhov tsim nyog rau kev siv zog ua haujlwm ntawm super ultra-luv laser.

FIG. 1 (a) lub qaij ntawm lub mem tes pem hauv ntej tshwm sim los ntawm lub prism thiab lub grating, thiab (b) cov nyhuv ntawm distortion ntawm lub mem tes pem hauv ntej ntawm qhov chaw-lub sij hawm lub teeb teb ntawm lub hom phiaj

Pulse ceev tswj ntawm ultra-muaj zogultrashort laser
Tam sim no, Bessel beams uas tsim los ntawm conical superposition ntawm lub dav hlau tsis tau pom daim ntawv thov tus nqi nyob rau hauv high field laser physics. Yog hais tias lub conical superimposed pulsed beam muaj ib tug axisymmetric mem tes pem hauv ntej tis, ces lub geometric chaw siv ntawm cov generated X-ray yoj pob ntawv raws li qhia nyob rau hauv daim duab 2 yuav ua tau tas li superluminal, tas li subluminal, ceev superluminal, thiab decelerated subluminal. Txawm tias kev sib xyaw ua ke ntawm daim iav deformable thiab theem hom spatial lub teeb modulator tuaj yeem tsim cov duab spatio-temporal ntawm cov mem tes pem hauv ntej, thiab tom qab ntawd tsim cov kev sib kis tau ceev. Cov nyhuv saum toj no ntawm lub cev thiab nws cov cuab yeej hloov kho tuaj yeem hloov qhov "distortion" ntawm pulse pem hauv ntej mus rau "tswj" ntawm lub plawv dhia pem hauv ntej, thiab tom qab ntawd paub txog lub hom phiaj ntawm kev hloov pauv kev sib kis ceev ntawm ultra-muaj zog ultra-luv laser.

FIG. 2 Lub (a) tsis tu ncua ceev-tshaj-teeb, (b) tas li sublight, (c) ceev ceev-tshaj-teeb, thiab (d) decelerated sublight lub teeb pulses generated los ntawm superposition yog nyob rau hauv lub geometric centre ntawm lub superposition cheeb tsam.

Txawm hais tias qhov kev tshawb pom ntawm pulse pem hauv ntej distortion yog ntxov tshaj super ultra-luv laser, nws tau dav kev txhawj xeeb nrog rau kev txhim kho ntawm super ultra-luv laser. Tau ntev, nws tsis tsim nyog rau kev ua tiav ntawm lub hom phiaj tseem ceeb ntawm super ultra-luv laser - ultra-high focusing light intensity, thiab cov kws tshawb fawb tau ua hauj lwm los suppress los yog tshem tawm ntau yam pulse pem hauv ntej distortion. Niaj hnub no, thaum lub "pulse pem hauv ntej distortion" tau tsim rau hauv "pulse pem hauv ntej tswj", nws tau ua tiav cov kev cai ntawm kev sib kis ceev ntawm super ultra-luv laser, muab tshiab txhais tau tias thiab tshiab lub sij hawm rau daim ntawv thov ntawm super ultra-luv laser nyob rau hauv high-field laser physics.