啁啾脉冲辐照下始于原子迭加态的高次谐波发射

The high-order harmonics from an initial atomic superposition states irradiated by chirped pulses

本文研究了一维初态为基态与第一激发态等权线性迭加态的模型原子在不同正啁啾激光脉冲辐照下的高次谐波发射谱.数值结果表明,谐波谱平台的截止位置随啁啾系数的增大大幅度的展宽.采用SMT(simple man's theory)仔细分析了各啁啾激光场辐照下电子的动力学行为,阐明了谐波谱平台随啁啾系数增大而展宽的机制.

We investigated the high-order harmonic generation(HHG)spectrum from a one dimensional model atom initially prepared in an equally weighted superposition of ground and the 1st-excited state irradiated by positive chirped pulses.It is found that the HHG plateau is extended on a large scale by increasing the chirp.We clarified the mechanism why the HHG plateau is extended on a lager scale with the increase of the chirp by analyzing the dynamic behavior in terms of SMT.