Hloov qhov ceev ntawm lub zog ultrashort laser

Hloov qhov ceev ntawm lub zogultrashort laser muaj zog heev

Feem ntau, cov laser luv luv heev (super ultra-short lasers) yog hais txog cov laser pulses uas muaj cov pulse widths ntawm kaum tawm thiab pua pua femtoseconds, lub zog siab tshaj plaws ntawm terawatts thiab petawatts, thiab lawv lub teeb ci ntsa iab tshaj 1018 W/cm2. Cov laser luv luv heev thiab nws cov khoom siv hluav taws xob loj heev thiab cov khoom siv hluav taws xob siab muaj ntau yam txiaj ntsig ntawm kev siv hauv ntau qhov kev tshawb fawb yooj yim xws li cov physics muaj zog siab, cov khoom siv hluav taws xob me me, plasma physics, nuclear physics thiab astrophysics, thiab cov txiaj ntsig ntawm kev tshawb fawb tuaj yeem pab cov lag luam high-tech, kev kho mob, lub zog ib puag ncig thiab kev tiv thaiv teb chaws. Txij li thaum muaj kev tsim cov thev naus laus zis chirped pulse amplification hauv xyoo 1985, qhov tshwm sim ntawm thawj lub ntiaj teb beat watt.laserxyoo 1996 thiab ua tiav lub ntiaj teb thawj 10-beat watt laser hauv xyoo 2017, qhov tseem ceeb ntawm super ultra-short laser yav dhau los feem ntau yog kom ua tiav "lub teeb ci ntsa iab tshaj plaws". Nyob rau hauv xyoo tas los no, kev tshawb fawb tau qhia tias nyob rau hauv qhov xwm txheej ntawm kev tswj hwm super laser pulses, yog tias qhov ceev ntawm lub zog kis ntawm super ultra-short laser tuaj yeem tswj tau, nws yuav coj ob npaug ntawm qhov tshwm sim nrog ib nrab ntawm kev siv zog hauv qee qhov kev siv lub cev, uas xav tias yuav txo qhov ntsuas ntawm super ultra-shortcov khoom siv laser, tab sis txhim kho nws cov nyhuv hauv kev sim laser physics siab.

Kev cuam tshuam ntawm lub zog pem hauv ntej ntawm ultra-muaj zog ultrashort laser
Yuav kom tau txais lub zog siab tshaj plaws hauv qab lub zog txwv, qhov dav ntawm lub zog raug txo kom txog 20 ~ 30 femtoseconds los ntawm kev nthuav dav qhov nce bandwidth. Lub zog ntawm lub zog ntawm lub laser 10-beak-watt ultra-short tam sim no yog li 300 joules, thiab qhov kev puas tsuaj qis ntawm lub compressor grating ua rau lub qhov beam feem ntau loj dua 300 hli. Lub beam nrog 20 ~ 30 femtosecond pulse dav thiab 300 hli aperture yooj yim nqa qhov spatiotemporal coupling distortion, tshwj xeeb tshaj yog qhov distortion ntawm lub pulse pem hauv ntej. Daim duab 1 (a) qhia txog qhov sib cais ntawm lub zog ntawm lub zog thiab lub zog theem los ntawm lub luag haujlwm ntawm lub beam, thiab tus qub qhia txog "spatio-temporal tilt" piv rau qhov kawg. Qhov thib ob yog qhov nyuaj dua "curvature ntawm qhov chaw-lub sijhawm" los ntawm lub lens system. Daim duab 1 (b) qhia txog cov teebmeem ntawm lub zog zoo tagnrho, lub zog inclined thiab lub zog bent ntawm lub zog ntawm lub teeb ntawm lub hom phiaj. Yog li ntawd, qhov kev siv lub teeb pom kev zoo raug txo qis heev, uas tsis zoo rau kev siv lub zog ntawm super ultra-luv laser.

DUAB 1 (a) qhov kev nkhaus ntawm lub pulse front uas tshwm sim los ntawm lub prism thiab lub grating, thiab (b) qhov cuam tshuam ntawm qhov kev cuam tshuam ntawm lub pulse front rau ntawm lub teeb ci ntawm qhov chaw thiab lub sijhawm rau ntawm lub hom phiaj.

Kev tswj ceev ntawm lub zog ultra-muaj zoglaser luv luv
Tam sim no, cov kab teeb Bessel uas tsim los ntawm kev sib tshooj ntawm cov nthwv dej dav hlau tau qhia txog qhov muaj txiaj ntsig zoo hauv kev siv laser physics siab. Yog tias lub teeb pulsed beam uas sib tshooj nrog lub conical muaj qhov faib tawm ntawm lub zog pem hauv ntej axisymmetric, ces qhov chaw nruab nrab ntawm lub zog ntawm cov nthwv dej X-ray uas tsim tawm raws li pom hauv Daim Duab 2 tuaj yeem yog qhov tsis tu ncua superluminal, tsis tu ncua subluminal, accelerated 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 lub pulse pem hauv ntej, thiab tom qab ntawd tsim cov kev sib kis ceev uas tswj tau. Cov nyhuv saum toj no thiab nws cov thev naus laus zis modulation tuaj yeem hloov "distortion" ntawm lub pulse pem hauv ntej mus rau "kev tswj" ntawm lub pulse pem hauv ntej, thiab tom qab ntawd paub txog lub hom phiaj ntawm kev hloov pauv qhov ceev ntawm lub laser ultra-muaj zog ultra-luv.

DUAB 2 Lub (a) lub teeb nrawm dua lub teeb tas li, (b) lub teeb qis tas li, (c) lub teeb nrawm dua lub teeb, thiab (d) lub teeb qis qeeb uas tsim los ntawm kev sib tshooj yog nyob hauv nruab nrab ntawm thaj chaw sib tshooj.

Txawm hais tias qhov kev tshawb pom ntawm pulse front distortion yog ua ntej super ultra-short laser, nws tau raug txhawj xeeb dav nrog rau kev tsim kho ntawm super ultra-short laser. Tau ntev, nws tsis zoo rau kev ua tiav lub hom phiaj tseem ceeb ntawm super ultra-short laser - ultra-high focusing light intensity, thiab cov kws tshawb fawb tau ua haujlwm los tswj lossis tshem tawm ntau yam pulse front distortion. Niaj hnub no, thaum "pulse front distortion" tau tsim mus rau hauv "pulse front control", nws tau ua tiav kev tswj hwm ntawm qhov ceev kis ntawm super ultra-short laser, muab cov txhais tau tias tshiab thiab cov cib fim tshiab rau kev siv super ultra-short laser hauv high-field laser physics.