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中文摘要：
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.
英文摘要：
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.
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