摘要
在含时密度泛函理论框架下,采用经典和量子相结合的模型,模拟了氢原子在超强飞秒激光脉冲作用下的高次谐波产生现象,并研究了激光脉冲形状对氢原子高次谐波的影响.结果表明,氢原子的高次谐波谱具有典型的原子谐波谱的特征;具有"下降-平台-截止"的结构和偶次谐波被禁闭仅出现奇次谐波的选择性特征;不同的脉冲形状会导致高次谐波的截止频率和谱线强度的变化.
The high order harmonic generation （HHG） of hydrogen atom radiated by ultra-strong femtosecond laser pulse was simulated by the TDDFT method with the classical and quantum combination technique. And the effects of pules-shape on HHG were studied. The results indicate that the HHG spectrum of hydrogen atom is similar to the typical atom HHG spectrum,which have a ＂Decrease-Plateau- Cutoff＂ structure. A kind of ＂odd allowed, even forbidden＂ selective phenomena of the order number of HHG are observed. The different pulse-shape may change the cut-off order and spectrum intensity of HHG simultaneously.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2008年第11期2159-2162,共4页
Acta Photonica Sinica
基金
江苏省教育厅基金(03KJB140152)
宿迁学院科研基金资助
