中国物理B ›› 2020, Vol. 29 ›› Issue (10): 104207-.doi: 10.1088/1674-1056/ab9deb

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M R Sami1, A Shahbaz1,†()   

  • 收稿日期:2020-03-13 修回日期:2020-05-03 接受日期:2020-06-18 出版日期:2020-10-05 发布日期:2020-10-05
  • 通讯作者: A Shahbaz

Role of quantum paths in generation of attosecond pulses

M R Sami and A Shahbaz†   

  1. 1 Department of Physics, Government College University, P.O. Box 54000 Lahore, Pakistan
  • Received:2020-03-13 Revised:2020-05-03 Accepted:2020-06-18 Online:2020-10-05 Published:2020-10-05
  • Contact: Corresponding author. E-mail: atif-shahbaz@gcu.edu.pk

Abstract:

We investigate the role of core potential in high ionization potential systems on high harmonic generation (HHG) spectra and obtain attosecond pulses. In our scheme, we use a standard soft core potential to model high ionization potential systems and irradiated these systems with fixed laser parameters. We observe the role of these systems on all the three steps involved in HHG process including ionization, propagation and recombination. In our study, the results illustrate that for high ionization potential systems, the HHG process is more sensitive to the ionization probability compared to the recombination amplitude. We also observe that due to the stronger core potential, small oscillations of the electrons during the propagation do not contribute to the HHG spectrum, which implies the dominance of only long quantum paths in the HHG spectrum. Our results, for attosecond pulse generation, show that long quantum path electrons are responsible for the supercontinuum region near the cutoff, which is suitable for the extraction of a single attosecond pulse in this region.

Key words: high-order harmonic generation, attosecond pulses, quantum paths, strong nuclear potential

中图分类号:  (Frequency conversion; harmonic generation, including higher-order harmonic generation)

  • 42.65.Ky
42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 02.60.Cb (Numerical simulation; solution of equations)