H^(+)2和D^(+)2谐波强度与波长的关系

The relation of harmonic intensity between H^(+)2 and D^(+)2 with wavelength

为了了解H^(+)2及其同位素分子谐波光谱效率与激光波长之间的关系,采用求解2维薛定谔方程的方法,理论研究了600nm~1600nm激光波长下H^(+)2和D^(+)2谐波光谱强度随波长的变化关系。结果表明,光谱强度随波长增大而减小;在短波长区间,H^(+)2光谱强度减小的倍率要大于D^(+)2,在长波长区间,H^(+)2光谱强度减小的倍率要小于D^(+)2;此外,在弱光强下,H^(+)2光谱强度总是大于D^(+)2,在强光强下,H^(+)2光谱强度在短波长区间小于D^(+)2,而其在长波长区间大于D^(+)2;核间距延伸和电荷共振增强电离在H^(+)2和D^(+)2谐波光谱强度变化上起到主要作用。这一结果对分子谐波调控是有帮助的。

In order to understand the relation between the harmonic spectra efficiency of H^(+)2 and its isotope molecule with laser wavelength,the relation between the harmonic intensity of H^(+)2 and D^(+)2 with the wavelength in the range of 600nm~1600nm was theoretically studied by solving 2-D time-dependent Schrodinger equation.It is shown that the intensity of harmonic spectrum is decreased as the wavelength increases.In shorter wavelength region,the decrease rate of harmonic intensity of H^(+)2 is greater than that of D^(+)2.In longer wavelength region,the decrease rate of harmonic intensity of H^(+)2 is smaller than that of D^(+)2.Furthermore,driven by lower laser intensity,the harmonic yield of H^(+)2 is always higher than that of D^(+)2.Driven by stronger laser intensity,the harmonic yield of H^(+)2 is lower than that of D^(+)2 in shorter wavelength region;while,it is higher than that of D^(+)2 in longer wavelength region.Theoretical analyses show that the extension of nuclear distance and charge resonance enhanced ionization play the important role in the change of harmonic yield of H^(+)2 and D^(+)2.The results are helpful for molecular harmonic control.