利用高能电子流影响自导透明进行激光脉冲整形分析

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1、万方数据中国工程物理研究院硕士论文improvetheconversionefficiencyoflaser—drivenultrafastX—raysource，itisnecessarytoachievethecontroloftheplasma，andhencethecontroloftheprepulseandtherisefrontoflaser．Self-inducedtransparency(SIT)ofoverdenseplasmasmakesitpossibletocontrolthepulseshape,Ourresearchshowe

2、dthattheinfuenceofenergeticelectronfluxontheSITcanbeusedforpulseshapingbythecontroloftheprepulseandtherisefrontoflaser，andthusitisabletoachieveaccuratecontrolofthegradientofplasmadensity，increasingtheenergyabsorptionefficiencyofhotelectron，andthusimprovingtheconversionefficiencyof

3、laser-drivenultrafastX—raysource．Thispaperfirstintroducedthephysicalprincipleoflaser-drivenX-raysourceanditsyieldoptimization．andproposedaschemeforincreasingtheX—rayyieldbypulseshapingthroughtheinfluenceofenergeticelectronfluxontheSIT．Wethenpresentedtheself-inducedtransparencyinde

4、tail．AndthentheinfluenceofenergeticelectronrefluxingontheSITwascarefullydiscussed．Finally,westudiedtheinfluenceofenergeticelectronfluxontheSITandwithwhichtoshapethelaserpulse．gettingthecontroloftheprepulseandtherisefrontoflaser．Ourmainresearchresultsandinnovationsarelistedasfollow

5、ing：(1)WefirstfoundthatenergeticelectronrefluxingcaninfluencetheSIT,makingthelaserwithintensitylowerthanthethresholdintensityofSITcouldpenetratethroughtheoverdenseplasma．ThisphenomenonCanbeinterpretedasthat，theelectrondensitypeakduetothecompressionbylaserpreventsthepenetrationofth

6、elaserintotheplasmas，whentheenergeticelectronrefluxingarrivesthefrontsurface，itwillgeneratetheCoulombforcewhichcausestheelectronstodissipate，thenthelasercanpenetratethroughtheplasma．(2)WealsofoundthattheenergeticelectronfluxhasthesameinfluenceontheSITastheenergeticelectronrefluxin

7、g．(3)WeshapedthelaserpulsewiththeinfluenceofenergeticelectronfluxontheSIT，achievingthecontroloftheprepulseandtherisefrontoflaser,andgotalaserpulsewithahighcontrastandasteeprisefront．Keywords：laser-plasmainteractions；selfinducedtransparency；energeticelectronrefluxing；energeticelect

8、ronfluxIV万方数据中国工程物理研究院硕士论文目录摘要⋯⋯⋯