首 页    学报简介    作者投稿    专家审稿    编辑办公    读者须知    联系我们
 
利用啁啾场与单极场的组合场驱动He+发射高次谐波
High-order harmonic generation from He+ driven by the chirped pulse combined with the unipolar pulse
摘要点击 21  全文点击 13  投稿时间:2016-07-10  修订日期:2016-08-26
查看全文  查看/发表评论  下载PDF阅读器
DOI编号   
中文关键词   高次谐波  阿秒脉冲  啁啾场  单极场  空间非均匀效应
英文关键词   High-order harmonic generation  Attosecond pulse  Chirped pulse  Unipolar pulse  Spatial inhomogeneous effect
基金项目   国家自然科学基金11504151
作者单位E-mail
刘航 辽宁工业大学 liuhang20@126.com 
李义   
姚震   
冯立强  lqfeng1101@126.com 
中文摘要
    数值研究了He+在啁啾场与单极场下发射高次谐波及阿秒脉冲的特点。计算结果表明,当He+的初始波函数布局在基态与激发态的叠加态时,其谐波强度比单基态时增强7个数量级。随后在啁啾场及单极控制场的作用下,谐波发射的截止能量明显增强,谐波的干涉结构也明显减小。引入空间非均匀效应,谐波截止能量得到进一步延伸,形成一个320 eV的平台区。通过叠加谐波,可获得3个持续时间在45 as ~ 48 as的X射线脉冲。其强度比单基态输出的脉冲增强5 ~ 6个数量级。
英文摘要
    The generations of the high-order harmonic and the attosecond pulse from He+ ion driven by the chirped pulse combined with the unipolar pulse have been numerically investigated. The results show that by preparing the initial state as the coherent superposition of the ground and the first excited states of He+ ion, the harmonic yield is enhanced by 6 orders of magnitude in comparison with the single ground initial state case. Further, by introducing the laser chirp and the unipolar controlling pulse, the cutoff energy of harmonic spectrum is remarkably enhanced, and the interference structure of harmonic is also reduced. Further, with the introduction of the spatial inhomogeneous effect, the harmonic cutoff can be further extended, resulting in a super-bandwidth of 320 eV. By superposition of harmonics, three attosecond X-ray pulses with durations from 45 as to 48 as can be obtained, which is 5 ~ 6 orders of magnitude improvement in comparison with the single ground initial state case.

您是第 2644911 位访问者

版权所有 @ 2007《四川大学学报 (自然科学版)》编辑部
地址: 四川省成都市武侯区四川大学经管楼506室  邮编: 610064
电话: (028)85410393  传真: (028)85410393  E-mail: scdx@scu.edu.cn
本系统由北京勤云科技发展有限公司设计