Propagation characters of Gaussian laser beams in collisionless plasma: Effect of plasma temperature
- Department of Physics, Harbin Institute of Technology, Harbin 150001 (China)
This paper presents an investigation of the propagation characters of Gaussian laser beam in cold collisionless plasma by considering the plasma temperature variation. The ponderomotive nonlinearity is involved and induces the nonlinear self-focusing against spatial diffraction. The second-order differential equation of dimensionless beam width parameter f({xi}) in terms of plasma temperature is established from Maxwell's equations with paraxial approximation. The initial (P{sub 0},{rho}{sub 0}) plane, behaviors of f({xi}) parameter, and perturbed density n/nn{sub 0}n{sub 0} of different plasma temperatures are plotted and analyzed. The plasma temperature is divided into four regions, which leads to different propagation characters including oscillatory divergence, self-trapping, self-focusing, and steady divergence. The plasma density distribution modified by the electric field intensity and plasma temperature is discussed.
- OSTI ID:
- 21537655
- Journal Information:
- Physics of Plasmas, Vol. 18, Issue 4; Other Information: DOI: 10.1063/1.3575629; (c) 2011 American Institute of Physics; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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