强激光场中原子的束缚态和连续态对高次谐波的影响  

CONTRIBUTION OF THE BOUND STATES AND CONTINUUM STATES OF AN ATOM IN INTENSE LASER FIELDS TO HIGH HARMONIC GENERATION 

作　　者：周效信[1] 李白文[2] 

机构地区：[1]西北师范大学物理系,兰州730070 [2]中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室,武汉430071

出　　处：《物理学报》2001年第10期1902-1906,共5页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :19734 0 60 ;198740 5 1)~~

摘　　要：利用基函数展开结合线性最小二乘法方法求解含时薛定谔方程 ,研究了一维原子在强激光场中产生高次谐波过程中 ,束缚态和连续态以及它们的干涉效应对高次谐波的影响 .结果表明 ,低能的高次谐波是由束缚态 束缚态之间的相互作用产生的 ,高能的高次谐波是由束缚态 连续态之间的相互作用产生的 ,而截断频率后消失的高次谐波是由于束缚态 束缚态与束缚态Solving the time-dependent Schrodinger equation for a one-dimensional atom in an intense laser field based on the basis function expansion and a linear-least-squares fitting method, we examine the influence of the bound states, continuum states and the interference between them of the model atom on the high harmonic generation. It is found that the main contributions to the low-energy harmonic generations come from the bound-bound interaction, while the high-energy harmonic generations are from the bound-continuum. interaction. Beyond the cut-off, the interference of the bound-bound and bound-continuum interactions leads to the disappearance of the harmonic generation.

关 键 词：束缚态 连续态 线性最小二乘法 强激光场 高次谐波 原子物理学 量子力学 含时薛定谔方程 

分 类 号：TN241[电子电信—物理电子学]