原子在两色组合激光场中产生的单个阿秒脉冲  

The single attosecond pulse generated by atom exposed to two-color combined laser field

作　　者：叶小亮[1] 周效信[1,2] 赵松峰[1] 李鹏程[1] 

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070 [2]兰州重离子加速器国家重点实验室原子核理论研究中心,兰州730000

出　　处：《物理学报》2009年第3期1579-1585,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10674112);甘肃省自然科学基金(批准号:3ZS061-A25-013);甘肃省教育厅基金(批准号:0601-23);西北师大创新工程(批准号:NWNU-KJCXGC-03-21)资助的课题~~

摘　　要：利用分裂算符法求解含时薛定谔方程,对一维氦原子处于红外场(IR)与紫外场(UV)组合的两色激光场中产生的高次谐波进行研究,分析了由高次谐波产生的阿秒脉冲的特征.发现在组合场中可以通过增加红外场的强度,来缩短阿秒脉冲的宽度,通过调节组合场中两束激光的时间延迟,提高一个电子轨道对谐波的贡献,而抑制另一个电子轨道的贡献,从而得到低于100as的单个脉冲.By solving the time-dependent Schrdinger equation with split-operator method,we study the high harmonics of one-dimensional helium atom exposed to the two-color laser field composed of IR field and UV field,and analyze the characteristics of the attosecond pulse produced by the high-order harmonics. It is found that the width of the attosencond pulse is shortened by the increasing intensity of IR field in the combined laser field. By adjusting the time delay between two lasers,we can enhance the contribution of one of the electron trajectories and suppress that of the other. Thus we can obtain an isolated sub-100 as pulse.

关 键 词：强激光场 组合场 高次谐波 阿秒脉冲 

分 类 号：TN241[电子电信—物理电子学]