啁啾延迟调控在双原子分子谐波辐射中的作用

量子电子学报 ›› 2020, Vol. 37 ›› Issue (3): 314-320.

啁啾延迟调控在双原子分子谐波辐射中的作用

张译文1，刘航1,†，冯立强2

1辽宁工业大学化学与环境工程学院，辽宁锦州 121001； 2 辽宁工业大学理学院，辽宁锦州 121001

收稿日期:2019-12-24 修回日期:2020-02-10 出版日期:2020-05-28 发布日期:2020-05-28
通讯作者: 联系方式 E-mail:attophys_lngy@126.com
作者简介:张译文(1997-)，从事强激光场中电子动力学行为方面的研究。
基金资助:
辽宁省自然科学基金

The effect of chirp-delay regulation on diatomic molecular harmonic generation

ZHANG Yiwen1, LIU Hang1,†, FENG Liqiang2

1 School of Chemical and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001， China; 2 College of Science, Liaoning University of Technology, Jinzhou 121001， China

Received:2019-12-24 Revised:2020-02-10 Published:2020-05-28 Online:2020-05-28
Supported by:
Supported by Natural Science Foundation of Liaoning Province (辽宁省自然科学基金, 2019-MS-167)

摘要/Abstract

摘要： 为了获得高强度高次谐波光谱，提出了一种利用啁啾延迟来调控H2+和D2+谐波辐射强度的方法。结果表明：在短脉宽激光驱动下，H2+和D2+谐波辐射主要来自于激光下降区域。因此在激光下降区域引入啁啾小量会产生高强度谐波光谱连续区, 并且H2+谐波辐射强度大于D2+谐波辐射强度。而在长脉宽激光驱动下，H2+和D2+谐波辐射的贡献分别来自激光上升和下降区域。因此分别在激光上升和下降区域引入啁啾小量都会获得高强度谐波光谱连续区，但H2+谐波辐射强度小于D2+谐波辐射强度。最后，选择适当的谐波平台区并通过叠加谐波可获得脉宽为36 as的孤立脉冲。

关键词: 激光物理, 高次谐波, 啁啾调频场, 双原子分子, 阿秒光源

Abstract: In order to obtain high order harmonic spectra with high-intensity, a method of chirp-delay regulation is proposed to control the harmonic intensity of H2+ and D2+. The results show that, when driven by shorter pulse duration, the harmonic spectra of H2+ and D2+ mainly come from the falling-regionof laser field. Therefore, by properly introducing a chirp in the falling-region of laser field, the high-intensity spectral continuum can be obtained, and the harmonic intensity of H2+ is higher than that of D2+. However, when driven by longer pulse duration, the main contribution of harmonic spectra of H2+ and D2+ may come from both the rising and falling regions of laser field. Thus, the high-intensity spectral continuum can be produced by introducing the chirps in the rising or falling regions of laser field, and the harmonic intensity of H2+ is lower than that of D2+ in this case. Finally, by selecting the appropriate spectral continuum and superposing the harmonics, a single attosecond pulse with the pulse duration of 36 as can be obtained.

Key words: laser physics, high-order harmonic generation, frequency-chirping pulse, diatomic molecule, attosecond light sources

中图分类号:

O562.4

张译文, 刘航, †, 冯立强. 啁啾延迟调控在双原子分子谐波辐射中的作用[J]. 量子电子学报, 2020, 37(3): 314-320.

ZHANG Yiwen, LIU Hang, †, FENG Liqiang. The effect of chirp-delay regulation on diatomic molecular harmonic generation[J]. Chinese Journal of Quantum Electronics, 2020, 37(3): 314-320.

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