Self-focusing of intense high frequency electromagnetic waves in a collisional magnetoactive plasma

Niknam, A. R.; Aliakbari, A.; Majedi, S.; Haji Mirzaei, F.; Hashemzadeh, M.
November 2011
Physics of Plasmas;Nov2011, Vol. 18 Issue 11, p112305
Academic Journal
The self-focusing of an intense electromagnetic beam in a collisional magnetoactive plasma has been investigated by the perturbation method. Considering the relativistic and ponderomotive nonlinearities and the first three terms of perturbation expansion for the electron density and velocity, the nonlinear wave equation is obtained. This wave equation is solved by applying the source dependent expansion method and the evolution of electromagnetic beam spot-size is discussed. It is shown that the laser spot-size decreases with increasing the collision frequency and external magnetic field strength.


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