采用双脉冲提高谐波谱的谱线密度  

Increasing line-density of high-order harmonic generation spectra with bichromatic fields

作　　者：刘硕[1] 陈高[1] 陈基根[2] 朱颀人[3] 

机构地区：[1]长春理工大学理学院物理系,长春130022 [2]台州学院物理系,椒江318000 [3]吉林大学原子与分子物理研究所,长春130012

出　　处：《物理学报》2009年第3期1574-1578,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10474028,10604021)资助的课题~~

摘　　要：通过计算线偏振双脉冲激光场与一维氢原子模型相互作用产生的高次谐波辐射谱的含时Schrdinger方程.研究发现,选用适宜的双脉冲激光组合可以增加谐波谱的密度,这样的谐波谱特别适合作为产生孤立阿秒脉冲的光源.详细地分析了谐波谱线密度增加的物理机理,给出不同脉宽与谐波谱线密度增加的关系,从而可以有针对性地控制谐波谱线的疏密程度.By numerically solving time-dependent Schrdinger equation,we obtain high-order harmonic generation （HHG） spectra from the one-dimensional H atom model submitted to linear polarization bichromatic field. It is found that,appropriate bichromatic field could be a source of attosecond pulse generation since it produces a ligher line-density in harmonic generation spectra （HGS）. Based on it,we analyze the mechanism of generating denser HHG spectral lines in detail,and give density-selection numerical experiential formulas for different pulses duration,to achieve further control of the line density of HGS.

关 键 词：高次谐波 阿秒脉冲 双脉冲 

分 类 号：O437[机械工程—光学工程]