中国物理B ›› 2004, Vol. 13 ›› Issue (6): 905-912.doi: 10.1088/1009-1963/13/6/021
• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇 下一篇
张秋菊, 盛政明, 张杰
Zhang Qiu-Ju (张秋菊), Sheng Zheng-Ming (盛政明), Zhang Jie (张杰)
摘要: A linear theory on the propagation of ultrashort pulses including only a few cycles in underdense plasmas is presented. It is shown that the dispersion in plasmas causes severe distortions in the pulse shape, including pulse chirping and spreading. The analytical calculations coincide very well with those obtained by particle-in-cell (PIC) simulations. The upper limit of the peak amplitude of the pulses, above which the linear theory breaks down due to the setting in of nonlinear effects of both the relativistic electron-mass increase and ponderomotive force, is also examined by PIC simulations. At certain high amplitudes, it is found that the ultrashort laser pulses can propagate like solitons.
中图分类号: (Laser light absorption in plasmas (collisional, parametric, etc.))