中国物理B ›› 2024, Vol. 33 ›› Issue (2): 23301-023301.doi: 10.1088/1674-1056/ad062b

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Generating attosecond pulses with controllable polarization from cyclic H32+ molecules by bichromatic circular fields

Si-Qi Zhang(张思琪)1, Bing Zhang(张冰)1,†, Bo Yan(闫博)1, Xiang-Qian Jiang(姜向前)1,‡, and Xiu-Dong Sun(孙秀冬)1,2   

  1. 1 School of Physics, Harbin Institute of Technology, Harbin 150001, China;
    2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
  • 收稿日期:2023-09-14 修回日期:2023-10-11 接受日期:2023-10-24 出版日期:2024-01-16 发布日期:2024-01-25
  • 通讯作者: Bing Zhang, Xiang-Qian Jiang E-mail:zhangbing@hit.edu.cn;xqjiang@hit.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (Grant No. 91950117) and the Fundamental Research Funds for the Central Universities.

Generating attosecond pulses with controllable polarization from cyclic H32+ molecules by bichromatic circular fields

Si-Qi Zhang(张思琪)1, Bing Zhang(张冰)1,†, Bo Yan(闫博)1, Xiang-Qian Jiang(姜向前)1,‡, and Xiu-Dong Sun(孙秀冬)1,2   

  1. 1 School of Physics, Harbin Institute of Technology, Harbin 150001, China;
    2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
  • Received:2023-09-14 Revised:2023-10-11 Accepted:2023-10-24 Online:2024-01-16 Published:2024-01-25
  • Contact: Bing Zhang, Xiang-Qian Jiang E-mail:zhangbing@hit.edu.cn;xqjiang@hit.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Grant No. 91950117) and the Fundamental Research Funds for the Central Universities.

摘要: We investigate the polarization properties of harmonics from the cyclic H32+ molecular ions in tailored bichromatic counter-rotating circularly polarized (BCCP) fields by solving the time-dependent Schrödinger equation. The allowed harmonics and their helicities are associated with the symmetry compatibility of the field-target systems, and large intensity difference between adjacent harmonics with opposite helicities appears in a wide spectral range when the BCCP field is at certain rotation angles. We try to explain the intensity difference by using a recombination model based on the quantum-orbit theory and by analyzing the ionization pathways. Moreover, to synthesize attosecond pulse trains with tunable polarization, the intensity difference is manipulated by introducing a seed XUV field, and by changing the relative amplitude ratio as well as the helicity of BCCP fields.

关键词: high-order harmonic generation, attosecond pulse, multi-center interference

Abstract: We investigate the polarization properties of harmonics from the cyclic H32+ molecular ions in tailored bichromatic counter-rotating circularly polarized (BCCP) fields by solving the time-dependent Schrödinger equation. The allowed harmonics and their helicities are associated with the symmetry compatibility of the field-target systems, and large intensity difference between adjacent harmonics with opposite helicities appears in a wide spectral range when the BCCP field is at certain rotation angles. We try to explain the intensity difference by using a recombination model based on the quantum-orbit theory and by analyzing the ionization pathways. Moreover, to synthesize attosecond pulse trains with tunable polarization, the intensity difference is manipulated by introducing a seed XUV field, and by changing the relative amplitude ratio as well as the helicity of BCCP fields.

Key words: high-order harmonic generation, attosecond pulse, multi-center interference

中图分类号:  (Ultraviolet spectra)

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