Nuclear signatures on the molecular harmonic emission and the attosecond pulse generation
Nuclear signatures on the molecular harmonic emission and the attosecond pulse generation
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分子谐波发射和阿秒脉冲生成的核特征
DOI：
10.1063/1.3681165
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发表时间：
2012-02-07
影响因子：
4.4
通讯作者：
Chu, Tianshu
中科院分区：
文献类型：
--
作者：
Feng, Liqiang;Chu, Tianshu
本文从理论上研究了H-2(+)/D-2（+）离子在5 fs/800 nm啁啾脉冲作用下的核特征效应，即初始振动态和同位素对分子高次谐波和阿秒脉冲产生的影响。这些振动分子离子的时变薛定谔方程的数值解表明，谐波谱的强度随着初始振动态的增强而增强。此外，通过对同位素效应的研究，我们发现在较轻的原子核中产生更强烈的谐波。此外，在最优初始振动状态下对啁啾脉冲进行优化，可以获得带宽为325 eV的强超外连续谱。通过适当地叠加谐波频谱，可以产生短至57 μ s （16 μ s）的阿秒脉冲，而无需相位补偿。(C) 2012年美国物理研究所。(doi: 10.1063/1.3681165)
In this paper, we theoretically investigate the nuclear signatures effects, i.e., the initial vibrational state and the isotopic effects on the generations of the molecular high-order harmonics and the attosecond pulses when the model H-2(+)/D-2(+) ions are exposed to a 5 fs/800 nm chirp pulse. The numerical solution of the time-dependent Schrodinger equation for these vibrating molecule ions shows that the intensities of the harmonic spectra are reinforced with the enhancement of the initial vibrational state. Moreover, through the investigation of the isotopic effect, we find that more intense harmonics are generated in the lighter nucleus. Furthermore, by optimizing the chirp pulse under the optimal initial vibrational state, an intense ultrabroad supercontinuum with a 325 eV bandwidth can be obtained. By properly superposing the harmonic spectrum, an attosecond pulse as short as 57 as (16 as) is generated without (with) phase compensation. (C) 2012 American Institute of Physics. [doi:10.1063/1.3681165]