双色光场驱动产生单个阿秒脉冲过程中的宏观效应  

Macroscopic effects of high-order harmonic and isolated attosecond pulse generation driven by two-color laser field

作　　者：陆莹瑛[1] 曾志男[1] 郑颖辉[1] 邹璞[1] 刘灿东[1] 龚成[1] 李儒新[1] 徐至展[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800

出　　处：《物理学报》2011年第10期210-214,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10734080;60921004;10904157;60978012);国家重点基础研究发展计划(批准号:2006CB806000);上海市科委启明星计划(批准号:10QA1407600)资助的课题~~

摘　　要：通过数值模拟三维传播方程研究了双色场产生高次谐波过程中宏观效应的影响,重点分析了阿秒脉冲的时域形状.在6fs/800nm和21.3fs/400nm组成的双色场中,通过调节双色场间的相对延时,双色场各焦点相对于气体盒子入口的间距和双色场束腰半径和气体压强等参数,可以在平台区得到超宽带连续谱.对该连续谱中420—540eV的谐波直接进行滤波后可以得到时间同步性很好的单个阿秒脉冲.这种性质对实验上通过双色场方案产生超短的阿秒脉冲非常有利.The macroscopic effects of high-order harmonic and attosecond pulse generation driven by two-color laser field are numerically investigated by three-dimensional propagation equation.It is shown that when the 6fs/800nm and 21.3fs/400 laser pulses are focused into gas medium,a broadband supercontinuum can be generated in the plateau by adjusting the time delay between two driven pulses,the position of the entrance of gas medium,the beam waist of driving pulses and the gas pressure.A highly synchronous isolated attosecond pulse can be generated by directly filtering out the harmonics from 420—540 eV in the supercontinuum,which facilitates the experimental implementation for the isolated attosecond pulse generation by two-color scheme.

关 键 词：传播效应 阿秒脉冲 时间同步性 

分 类 号：O437[机械工程—光学工程]