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激光功率密度对Al膜靶后表面快电子发射的影响
引用本文:张淼,王琛,方智恒,王瑞荣,傅思祖,顾援,林尊琪.激光功率密度对Al膜靶后表面快电子发射的影响[J].强激光与粒子束,2005,17(11):1696-1700.
作者姓名:张淼  王琛  方智恒  王瑞荣  傅思祖  顾援  林尊琪
作者单位:中国科学院 上海光学精密机械研究所 高功率激光物理国家实验室, 上海 201800
基金项目:国家自然科学基金资助课题(29825106, 20073053).致谢 衷心感谢黄关龙、管富义、谢兴龙老师在实验中给予的帮助;感谢“SPS”运行组全体人员.
摘    要: 报道了在20 TW皮秒激光器上完成的p偏振激光与等离子体相互作用过程中产生的快电子的角分布和能谱测量结果。实验得到:当激光功率密度小于1017 W/cm2时,电子发射没有明显定向性,在激光入射面内多峰发射;当激光功率密度大于1017 W/cm2,小于1018 W/cm2时,电子主要沿靶面法线方向发射;当激光功率密度达到相对论强度时,电子主要沿激光传播方向发射;激光功率密度未达到相对论强度时,靶后表面法线方向快电子能谱拟合平均温度符合共振吸收温度定标率;激光功率密度达相对论强度以上时,靶后表面法线方向快电子能谱拟合平均温度高于已有的温度定标率。

关 键 词:皮秒激光  铝薄膜靶  快电子  角分布  能谱分布
文章编号:1001-4322(2005)11-1696-05
收稿时间:2005-01-17
修稿时间:2005-06-20

Laser intensity effects on forward hot electrons in interaction with Al foil
ZHANG Miao,WANG Chen,FANG Zhi-heng,WANG Rui-rong,FU Si-zu,GU Yuan,LIN Zun-qi.Laser intensity effects on forward hot electrons in interaction with Al foil[J].High Power Laser and Particle Beams,2005,17(11):1696-1700.
Authors:ZHANG Miao  WANG Chen  FANG Zhi-heng  WANG Rui-rong  FU Si-zu  GU Yuan  LIN Zun-qi
Institution:National Laboratory on High Power Laser Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, P.O.Box 800-211, Shanghai 201800, China
Abstract:The characteristics of the forward hot electrons produced by 20 TW p-polarized picosecond laser-plasma interactions are studied at laser intensities from subrelativistic to relativistic. The spatial distribution of forward hot electrons is multi-peak distribution, as laser intensity is under 107 W/cm^2. When laser intensity is between 1017 and 1018 W/cm^2 , the peak of the hot electron beam is along the target normal direction. The peak of the hot electron beam shifts to the laser propagation direction from the target normal direction as the laser intensity reaches the relativistic. The temperature of hot electrons fit resonance absorption scaling law as the laser intensity under the relativistic. The temperature of hot electrons is much higher than that expected by the empirical scaling law as the laser intensity reaches the relativistic.
Keywords:Piconsecond laser pulse  Al foil target  Fast electron  Angular distribution  Energy spectra
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