飛秒激光強(qiáng)場(chǎng)中高次諧波課件

飛秒激光強(qiáng)場(chǎng)中的高次諧波高次諧波(High-orderHarmonicGeneration)

概念:

由某一基頻光與非線性物質(zhì)作用而輻射出一系列的頻率是基頻光整數(shù)倍的光。(VUV,EUV,softandhardX-ray)

Theatomessentiallyactsasacatalysttocombinemanylow-energyphotonsfromthedrivinglaserintoasinglehigh-energyphoton意義:高次諧波產(chǎn)生是獲得相干的極紫外和X射線輻射的主要的和最有前途的途徑之一。

產(chǎn)生阿秒(10-18s)脈沖一、產(chǎn)生/機(jī)制二、特點(diǎn)/規(guī)律三、研究/進(jìn)展飛秒激光強(qiáng)場(chǎng)中高次諧波實(shí)驗(yàn)室產(chǎn)生示意圖IntensefslaserGasjet(Xe)HarmonicgenerationFilterCCDHigh-orderharmonics(A)強(qiáng)宏觀……產(chǎn)生/機(jī)制Corkum,Phys.Rev.Lett.71,1994(1993)Lewenstein,Phys.Rev.A49,2117(1994)三步模型簡(jiǎn)介(Instrongfield0ffemtosecondlaser)1.Fieldtunnelionizationofelectron()2.Electronoscillateinlaserfield(accelerate)3.Electronre-collidewithionatom,(recombines)Step1Step2Step3產(chǎn)生/機(jī)制特點(diǎn)/規(guī)律1.Oddharmonics2.Plateau3.CutoffenergyPhys.Rev.Lett.71,1994(1993)tTL傅立葉變換4.Shortlightpulses---Attosecond(10-18s)特點(diǎn)/規(guī)律脈沖寬度小于等于驅(qū)動(dòng)場(chǎng)研究/進(jìn)展Phys.Rev.Lett.70(6),766(1993)1993更短波長(zhǎng)(截止區(qū)）更高的效率（平臺(tái)區(qū)）更短脈沖（阿秒脈沖--平臺(tái)區(qū)、截止區(qū)）806nm

125fs

1.3x1015W/cm2

Ne109th-7.4nm

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