理论探究二次回碰峰值的激光参数效应
首发时间:2013-08-19
摘要:本文通过求解一维含时薛定谔方程研究了初始态为叠加态的氦原子与双色激光场相互作用产生高次谐波过程中二次回碰现象的激光参数效应。为了消除二次回碰现象,文中从两束激光的激光强度相对比率和相对相位两个方面进行详细研究。数值计算结果表明, 激光强度相对比率和相对相位的变化都会影响二次回碰峰值的大小,但是相对相位是消除二次回碰峰的关键因素。当两束激光强度相对比率为0.3,相对相位为-0.4π时,二次回碰峰被明显消除,此即最优条件。此外,借助于时频分布和电离几率, 计算结果得到了合理的解释。
For information in English, please click here
Theoretical exploration of laser-parameter effects on second-recombination peak
Abstract:We theoretically investigate the high-order harmonic generation from a one-dimensional model of the helium (He) atom in a coherent superposition of the ground state and the first excited state using a two-color laser field synthesized by a 6-fs laser pulse at 800nm and a 12-fs laser pulse at 1600nm. We study the phenomenon that ionized electrons, missing their parent ions at first recombination, recombine with the parent ions again in the HHG process. Then parameter effects on the phenomenon of second-recombination are discussed by varying control pulse relative strength ratio and relative phase in detail. By performing the time-frequency analysis of HHG and ionization probability, the physical mechanisms are investigated. As a consequence, the optimum conditions with the relative strength ratio 0.3 and relative phase -0.4 π for eliminating second-recombination peak are obtained.
Keywords: Atomic and molecular physics High-order harmonic spectrum second-recombination
论文图表:
引用
No.****
同行评议
勘误表
理论探究二次回碰峰值的激光参数效应
评论
全部评论0/1000