Spectral redshift of high-order harmonics by adding a weak pulse in the falling part of the trapezoidal laser pulse

We investigate the spectral redshift of high-order harmonics of the H_2~＋（D_2~＋） molecule by numerically solving the non-Born–Oppenheimer time-dependent Schr ¨odinger equation（TDSE）. The results show that the spectral redshift of highorder harmonics can be observed by adding a weak pulse in the fall...

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Bibliographic Details
Published in:Chinese physics B 2018-02, Vol.27 (2), p.374-379
Main Authors: 潘雪飞, 张军, 贲帅, 徐彤彤, 刘学深
Format: Article
Language:English
Subjects:
光谱
泛音
脉搏
掉落
激光
时间频率分析
时间依赖
奥本海默
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Summary:We investigate the spectral redshift of high-order harmonics of the H_2~＋（D_2~＋） molecule by numerically solving the non-Born–Oppenheimer time-dependent Schr ¨odinger equation（TDSE）. The results show that the spectral redshift of highorder harmonics can be observed by adding a weak pulse in the falling part of the trapezoidal laser pulses. Comparing with the H_2~＋ molecule, the shift of high-order harmonic generation（HHG） spectrum for the D_2~＋ molecule is more obvious.We employ the spatial distribution in HHG and time-frequency analysis to illustrate the physical mechanism of the spectral redshift of high-order harmonics.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/27/2/024206