中国物理B ›› 2016, Vol. 25 ›› Issue (9): 93202-093202.doi: 10.1088/1674-1056/25/9/093202

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Controlling the contributions to high-order harmonic generation from different nuclei of N2 with an orthogonally polarizedtwo-color laser field

Hui Du(杜慧), Xue-Fei Pan(潘雪飞), Hai-Feng Liu(刘海凤), Hong-Dan Zhang(张宏丹), Jun Zhang(张军), Jing Guo(郭静), Xue-Shen Liu(刘学深)   

  1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
  • 收稿日期:2016-04-07 修回日期:2016-04-25 出版日期:2016-09-05 发布日期:2016-09-05
  • 通讯作者: Xue-Shen Liu E-mail:liuxs@jlu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11271158, 61575077, and 11574117).

Controlling the contributions to high-order harmonic generation from different nuclei of N2 with an orthogonally polarizedtwo-color laser field

Hui Du(杜慧), Xue-Fei Pan(潘雪飞), Hai-Feng Liu(刘海凤), Hong-Dan Zhang(张宏丹), Jun Zhang(张军), Jing Guo(郭静), Xue-Shen Liu(刘学深)   

  1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
  • Received:2016-04-07 Revised:2016-04-25 Online:2016-09-05 Published:2016-09-05
  • Contact: Xue-Shen Liu E-mail:liuxs@jlu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11271158, 61575077, and 11574117).

摘要: The generation of high-order harmonic and the attosecond pulse of the N2 molecule with an orthogonally polarized two-color laser field are investigated by the strong-field Lewenstein model. We show that the control of contributions to high-order harmonic generation (HHG) from different nuclei is realized by properly selecting the relative phase. When the relative phase is chosen to be φ=0.4π, the contribution to HHG from one nucleus is much more than that from another. Interference between two nuclei can be suppressed greatly; a supercontinuum spectrum of HHG appears from 40 eV to 125 eV. 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, an isolated attosecond pulse with a duration of 80 as can be generated.

关键词: high-order harmonic generation, orthogonally polarized two-color laser field, attosecond pulse

Abstract: The generation of high-order harmonic and the attosecond pulse of the N2 molecule with an orthogonally polarized two-color laser field are investigated by the strong-field Lewenstein model. We show that the control of contributions to high-order harmonic generation (HHG) from different nuclei is realized by properly selecting the relative phase. When the relative phase is chosen to be φ=0.4π, the contribution to HHG from one nucleus is much more than that from another. Interference between two nuclei can be suppressed greatly; a supercontinuum spectrum of HHG appears from 40 eV to 125 eV. 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, an isolated attosecond pulse with a duration of 80 as can be generated.

Key words: high-order harmonic generation, orthogonally polarized two-color laser field, attosecond pulse

中图分类号:  (Multiphoton ionization and excitation to highly excited states)

  • 32.80.Rm
42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)