中国物理B ›› 2007, Vol. 16 ›› Issue (2): 456-462.doi: 10.1088/1009-1963/16/2/028

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Intense laser beam guiding in self-induced electron cavitation channel in underdense plasmas

武慧春1, 苍宇2, 余玮2, 徐涵2, 田友伟2   

  1. (1)Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; (2)State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2006-06-09 修回日期:2006-08-28 出版日期:2007-02-20 发布日期:2007-02-20
  • 基金资助:
    Project supported by the National High Technology Inertial Confinement Fusion Foundation (Grant No 10335020/A0506), the National Natural Science Foundation of China (Grant Nos 10474081 and 10576035), and Natural Science Foundation of Shanghai (Grant No 05ZR14159).

Intense laser beam guiding in self-induced electron cavitation channel in underdense plasmas

Cang Yu(苍宇)a), Yu Wei(余玮)a), Wu Hui-Chun(武慧春)b), Xu Han(徐涵)a), and Tian You-Wei(田友伟)a)   

  1. a State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; b Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2006-06-09 Revised:2006-08-28 Online:2007-02-20 Published:2007-02-20
  • Supported by:
    Project supported by the National High Technology Inertial Confinement Fusion Foundation (Grant No 10335020/A0506), the National Natural Science Foundation of China (Grant Nos 10474081 and 10576035), and Natural Science Foundation of Shanghai (Grant No 05ZR14159).

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摘要： In underdense plasmas, the transverse ponderomotive force of an intense laser beam with Gaussian transverse profile expels electrons radially, and it can lead to an electron cavitation. An improved cavitation model with charge conservation constraint is applied to the determination of the width of the electron cavity. The envelope equation for laser spot size derived by using source-dependent expansion method is extended to including the electron cavity. The condition for self-guiding is given and illuminated by an effective potential for the laser spot size. The effects of the laser power, plasma density and energy dissipation on the self-guiding condition are discussed.

关键词: relativistic self-focusing, ponderomotive self-channelling, self-induced electron cavitation, self-guiding

Abstract: In underdense plasmas, the transverse ponderomotive force of an intense laser beam with Gaussian transverse profile expels electrons radially, and it can lead to an electron cavitation. An improved cavitation model with charge conservation constraint is applied to the determination of the width of the electron cavity. The envelope equation for laser spot size derived by using source-dependent expansion method is extended to including the electron cavity. The condition for self-guiding is given and illuminated by an effective potential for the laser spot size. The effects of the laser power, plasma density and energy dissipation on the self-guiding condition are discussed.

Key words: relativistic self-focusing, ponderomotive self-channelling, self-induced electron cavitation, self-guiding

中图分类号:  (Self-focussing, channeling, and filamentation in plasmas)

  • 52.38.Hb
52.35.Mw (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)) 52.38.Kd (Laser-plasma acceleration of electrons and ions)