Laser and Particle Beams

Research Article

On self-focusing of laser beams in plasma

A. M. Rubenchika1 and S. K. Turitsyna1

a1 Institute of Automation and Electrometry, Novosibirsk, USSR, 630090


Self-focusing of laser beams in plasma is studied analytically using the thermal (collision produced) and ponderomotive (nonlinear force produced) effects based on the model of Zakharov with solutions of the nonlinear Schrödinger equation. A basic difference appears if the electric field amplitude E is less than the threshold Eth (at which the electrodynamic energy density is equal to the gasdynamic pressure) from the contrary case, E > Eth.The length of the filamentation process is evaluated and results in large values for E below Eth.

(Received November 26 1985)