激光脉宽对谐波频移和振幅强度的影响  

Pulse duration effect onfrequency and amplitude modulation of harmonics

作　　者：刘航[1] 刘辉[2] 冯立强[2,3] LIU Hang;LIU Hui;FENG Li-Qiang(School of Chemical and Environmental Engineering,Liaoning University of Technology,Jinzhou 121001,China;College of Science,Liaoning University of Technology,Jinzhou 121001,China;State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China)

机构地区：[1]辽宁工业大学化学与环境工程学院,锦州121001 [2]辽宁工业大学理学院,锦州121001 [3]中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023

出　　处：《原子与分子物理学报》2018年第5期815-819,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11504151);辽宁省博士启动基金(201501123);辽宁省教育厅基金(JL201615405)

摘　　要：数值研究了激光脉宽对H_2^+和T_2^+谐波辐射的影响.计算结果表明:(i)对于谐波频移现象:在少周期激光场下,H_2^+和T_2^+谐波辐射呈现红移.随着激光脉宽增大,H_2^+谐波辐射呈现蓝移; T_2^+谐波辐射红移减弱.(ii)对于谐波振幅强度:H_2^+和T_2^+谐波辐射强度会随着激光脉宽增大而增强.但是,在少周期激光场下,H_2^+谐波截至能量附近的强度要大于T_2^+.在多周期激光场下,T_2^+谐波截至能量附近的强度要大于H_2^+.Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China)Laser pulse duration effect on the high-order harmonic generation from H 2+and T 2+has been theoretically investigated.The results show that,(i)In the aspect of the frequency modulation of harmonics,the red-shifts of the harmonics from H 2+and T 2+can be found in the few-cycle pulse.As the pulse duration increases,the harmonics from H 2+present the blue-shifts and the red-shifts of the harmonics from T 2+are decreased.(ii)In the aspect of the amplitude modulation of harmonics,the intensities of the harmonics from H 2+and T 2+can be enhanced as the pulse duration increases.However,for the case of the few-cycle pulse,the intensities of the harmonic cutoffs from H 2+are higher than those from T 2+.For the case of the multi-cycle pulse,the intensities of the harmonic cutoffs from T 2+are higher than those from H 2+.

关 键 词：高次谐波 激光脉宽 谐波频移 谐波强度调制 

分 类 号：O562.4[理学—原子与分子物理]