优化两色组合场参数获得单个阿秒脉冲

基于经典方法优化了组合场中基频场和低频场的强度比，利用优化后的组合场驱动一维氦原子，通过求解含时薛定谔方程研究了氦原子产生的高次谐波，其截止位置得到扩展，再考虑基频场初相位对产生高次谐波的影响，能够得到脉宽为37as的单个阿秒脉冲.

Isolated attosecond pulse by optimize the parameters of two-color combined field

We optimize the intensity ratio of basic frequency field and low frequency field based on the classical theory. Then solving time-dependent Schrodinger equation of one-dimensional model helium atom driven by the optimized combined field, we find that high-order harmonic generation cut-off position of helium atom is extended. In addition, taking into account the initial phase of the basic frequency field, we obtain an isolated sub-37 attosecond pulse from the high-order harmonic generation of Helium atom driven by the combined field.