激光与薄膜靶作用产生X射线阿秒脉冲两种方案的比较  

THE COMPARISON OF TWO SCHEMES TO PRODUCE ATTOSECOND X- RAY PULSE FROM THE INTERACTION OF LASERS WITH THIN FOIL TARGET

作　　者：白易灵[1] 张秋菊[1] 

机构地区：[1]山东师范大学物理与电子科学学院,济南250014

出　　处：《山东师范大学学报（自然科学版）》2013年第2期56-59,共4页Journal of Shandong Normal University(Natural Science)

基　　金：国家自然科学基金资助（11104168）;山东省优秀中青年科学家科研奖励基金（BS2012CL033）.

摘　　要：运用一维粒子模拟对经由相对论电子束汤姆逊散射来产生阿秒X射线的两种方案进行了研究。第一种是激光驱动薄膜靶产生相对论电子束以及经过汤姆逊散射产生阿秒X射线，运用倍频探测光的方案可得到更短波长X射线。第二种方案添加了反射厚靶，通过厚靶对驱动激光的反射来减小电子束的横向动量但让其通过，而探测脉冲经过电子束汤姆逊散射后的多普勒频移因子提高，得到的X射线波长也明显减小，光子能量达到1KeV，反射光频谱也明显优与第一种方案．Two ways to generate attosecond x - ray pulses rely on coherent Thomson scattering from relativistic electron sheets are discussed in this paper by one - dimensional particle - in - cell simulations, the relativistic electron sheets generated by interaction between the drive - laser pulse and the foil target, attosecond X - ray pulses induced by Thomson backscattering from electron bunch and the use of doubling frequency probing laser pulse can make the wavelength of coherent attosecond X - ray radiation decrease in the first way. The key of the second method is an additional foil that reflects the drive - laser pulse thus reduce the transverse momentum of the electrons but let them pass. Also the coherently backscattered light with a higher Doppler shift factor . The wavelength of coherent attosecond X - ray radiation decrease obviously, and the energy of the scattered photons can achieve more than 1 KeV, the spectrum is better than in the single target model.

关 键 词：阿秒脉冲 相对论电子束 汤姆逊散射 

分 类 号：O539[理学—等离子体物理]