Developing process of filamentation and effect of characteristic parameters in underdense plasma have been studied using numerical simulation method.
The simulated results can be used to explain the laser plasmas filamentation, the langmuir wave's excitation and collapse, and the energy equilibration over both langmuir wave and transverse wave.
Inner diameter of capillary has important effect on the spectrum broadening when used to restrict filamentation in high pressure gas.
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