中国物理B ›› 2006, Vol. 15 ›› Issue (10): 2357-2362.doi: 10.1088/1009-1963/15/10/028

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Modulation of ionization on laser frequency in ultra-short pulse intense laser--gas-target

胡强林, 刘世炳   

  1. Institute of Laser Engineering, Beijing University of Technology,Beijing 100022, China
  • 收稿日期:2005-11-16 修回日期:2006-06-09 出版日期:2006-10-20 发布日期:2006-10-20
  • 基金资助:
    Project supported by the National Science Foundation of China (Grant Nos 10574010 and 10276002) and by Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) of China (Grant No 20050005016).

Modulation of ionization on laser frequency in ultra-short pulse intense laser--gas-target

Hu Qiang-Lin(胡强林) and Liu Shi-Bing(刘世炳)†   

  1. Institute of Laser Engineering, Beijing University of Technology,Beijing 100022, China
  • Received:2005-11-16 Revised:2006-06-09 Online:2006-10-20 Published:2006-10-20
  • Supported by:
    Project supported by the National Science Foundation of China (Grant Nos 10574010 and 10276002) and by Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) of China (Grant No 20050005016).

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摘要： Based on the dispersion relation of intense laser pulse propagating in gradually ionized plasma, this paper discusses the frequency modulation induced by ionization of an ultra-short intense laser pulse interacting with a gas target. The relationship between the frequency modulation and the ionization rate, the plasmas frequency variation, and the polarization of atoms (ions) is analysed. The numerical results indicate that, at high frequency, the polarization of atoms (ions) plays a more important role than plasma frequency variation in modulating the laser frequency, and the laser frequency variation is different at different positions of the laser pulse.

Abstract: Based on the dispersion relation of intense laser pulse propagating in gradually ionized plasma, this paper discusses the frequency modulation induced by ionization of an ultra-short intense laser pulse interacting with a gas target. The relationship between the frequency modulation and the ionization rate, the plasmas frequency variation, and the polarization of atoms (ions) is analysed. The numerical results indicate that, at high frequency, the polarization of atoms (ions) plays a more important role than plasma frequency variation in modulating the laser frequency, and the laser frequency variation is different at different positions of the laser pulse.

Key words: intense laser pulse, tunnelling ionization, partially stripped plasma

中图分类号:  (Laser-plasma interactions)

  • 52.38.-r
52.25.Jm (Ionization of plasmas)