摘要
为了了解核运动对H^+2和T^+2谐波辐射强度及产生阿秒脉冲的影响,采用数值求解薛定谔方程的方法,理论研究了10fs和20fs激光驱动下H^+2和T^+2谐波截止能量附近强度的变化。结果表明,短脉宽驱动下谐波强度满足H^+2>T^+2;而长脉宽驱动下谐波强度满足T^+2>H^+2;根据谐波强度变化规律,在最佳谐波辐射强度下引入半周期激光场可以获得高强度、高能量的谐波平台区,进而获得脉宽为37as的阿秒脉冲。该研究为探测同位素分子及产生高强度及高能量的阿秒脉冲提供了一种新的方案,对激光光学的发展有一定帮助。
In order to understand the effect of nuclear motion of H2^+ and T2^+ on harmonic intensity and attosecond pulse generation,the intensity changes in the harmonic cutoff region from H2^+ and T2^+ driven by a 10fs and 20fs lasers were theoretically studied by numerically solving the time-dependent Schr dinger equation.The results show that the harmonic intensity follows as H2^+>T2^+ under shorter pulse duration case;it follows as T2^+>H2^+ under longer pulse duration case.According to the changing law of harmonic intensity,the high intensity and high energy harmonic plateau can be obtained by introducing the half-cycle laser pulse under the optimal harmonic emission intensity,and then the attosecond pulse with pulse duration of 37as can be obtained.The study provides a new way to detect isotopic molecules and generate high intensity and high energy attosecond pulses.
作者
刘航
冯立强
LIU Hang;FENG Liqiang(School of Chemical and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, China;College of Science, Liaoning University of Technology, Jinzhou 121001, China)
出处
《激光技术》
CAS
CSCD
北大核心
2020年第6期721-725,共5页
Laser Technology
基金
国家自然科学基金资助项目(11504151)
辽宁省自然科学基金资助项目(2019-MS-167)
辽宁省教育厅科学研究资助项目(JJL201915405)。
关键词
激光光学
高次谐波
核运动
谐波强度
阿秒脉冲
laser optics
high-order harmonic generation
nuclear motion
harmonic intensity
attosecond pulse
作者简介
刘航(1985-),女,博士,副教授,主要从事强激光与原子分子相互作用等方面的研究,E-mail:attophys_lngy@126.com。
