Chin. Phys. B ›› 2012, Vol. 21 ›› Issue (12): 124204-124204.doi: 10.1088/1674-1056/21/12/124204

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Harmonic and attosecond pulse enhancement in the presence of noise

冯立强a, 楚天舒a b   

  1. a State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
    b Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China
  • 收稿日期:2012-04-13 修回日期:2012-05-08 出版日期:2012-11-01 发布日期:2012-11-01
  • 基金资助:
    Project supported by the National Natural Science Foundations of China (Grant Nos. 10874096 and 20633070).

Harmonic and attosecond pulse enhancement in the presence of noise

Feng Li-Qiang (冯立强)a, Chu Tian-Shu (楚天舒)a b   

  1. a State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
    b Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China
  • Received:2012-04-13 Revised:2012-05-08 Online:2012-11-01 Published:2012-11-01
  • Contact: Chu Tian-Shu E-mail:tschu@dicp.ac.cn;tschu008@163.com
  • Supported by:
    Project supported by the National Natural Science Foundations of China (Grant Nos. 10874096 and 20633070).

摘要: In this paper, we theoretically investigate the effect of noise on the photoionization, the generations of the high-order harmonic and the attosecond pulse irradiated from a model He+ ion. It shows that by properly adding the noise fields, such as the Gaussian white noise, the random light or the colour noise, both the ionization probabilities (IPs) and the harmonic yields can be enhanced by several orders of magnitude. Further, by tuning the noise intensity, a stochastic resonancelike curve is observed, showing the existence of an optimal noise in the ionization enhancement process. Finally, by superposing a properly selected harmonic, an intense attosecond pulse with a duration of 67 as is directly generated.

关键词: high-order harmonic generation, isolated attosecond pulse, photoionization

Abstract: In this paper, we theoretically investigate the effect of noise on the photoionization, the generations of the high-order harmonic and the attosecond pulse irradiated from a model He+ ion. It shows that by properly adding the noise fields, such as the Gaussian white noise, the random light or the colour noise, both the ionization probabilities (IPs) and the harmonic yields can be enhanced by several orders of magnitude. Further, by tuning the noise intensity, a stochastic resonancelike curve is observed, showing the existence of an optimal noise in the ionization enhancement process. Finally, by superposing a properly selected harmonic, an intense attosecond pulse with a duration of 67 as is directly generated.

Key words: high-order harmonic generation, isolated attosecond pulse, photoionization

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) 32.80.Fb (Photoionization of atoms and ions)