High-order harmonic generation of N2 molecule in two-color circularly polarized laser fields

The generation of high-order harmonics and the attosecond pulse of the N2 molecule in two-color circularly polarized laser fields are investigated by the strong-field Lewenstein model. We show that the plateau of spectra is dramatically extended and a continuous harmonic spectrum with the bandwidth...

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Bibliographic Details
Published in:中国物理B：英文版 2016-04 (4), p.104-109
Main Author: 杜慧 张军 贲帅 钟慧英 徐彤彤 郭静 刘学深
Format: Article
Language:English
Subjects:
N2分子
双色
圆偏振
激光场
超连续谱
路径控制
阿秒脉冲
高次谐波
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Summary:The generation of high-order harmonics and the attosecond pulse of the N2 molecule in two-color circularly polarized laser fields are investigated by the strong-field Lewenstein model. We show that the plateau of spectra is dramatically extended and a continuous harmonic spectrum with the bandwidth of 113 eV is obtained. When a static field is added to the x direction, the quantum path control is realized and a supercontinuum spectrum can be obtained, which is beneficial to obtain a shorter attosecond pulse. The underlying physical mechanism is well explained by the time-frequency analysis and the semi-classical three-step model with a finite initial transverse velocity. By superposing several orders of harmonics in the combination of two-color circularly polarized laser fields and a static field, an isolated attosecond pulse with a duration of 30 as can be generated.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/25/4/043202