中国物理B ›› 2016, Vol. 25 ›› Issue (4): 43202-043202.doi: 10.1088/1674-1056/25/4/043202

• SPECIAL TOPIC—Soft matter and biological physics (Review) • 上一篇    下一篇

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

Hui Du(杜慧), Jun Zhang(张军), Shuai Ben(贲帅), Hui-Ying Zhong(钟慧英), Tong-Tong Xu(徐彤彤), 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:2015-11-17 修回日期:2015-12-15 出版日期:2016-04-05 发布日期:2016-04-05
  • 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. 61575077, 11271158, and 11574117).

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

Hui Du(杜慧), Jun Zhang(张军), Shuai Ben(贲帅), Hui-Ying Zhong(钟慧英), Tong-Tong Xu(徐彤彤), Jing Guo(郭静), Xue-Shen Liu(刘学深)   

  1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
  • Received:2015-11-17 Revised:2015-12-15 Online:2016-04-05 Published:2016-04-05
  • Contact: Xue-Shen Liu E-mail:liuxs@jlu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 61575077, 11271158, and 11574117).

摘要:

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.

关键词: high-order harmonic generation, two-color circularly polarized laser fields, attosecond pulse

Abstract:

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.

Key words: high-order harmonic generation, two-color circularly polarized laser fields, 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)