نوع مقاله : فیزیک پلاسما
نویسندگان
1 دانشیار، دانشگاه مازندران، بابلسر ، ایران
2 استادیار،دانشگاه مازندران، بابلسر، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In this work, the self-focusing of a cosh-Gaussian laser beam in a thermal quantum plasma is investigated by considering relativistic and ponderomotive nonlinearities. The non-linear differential equation for the beam width parameter f is obtained and solved it numerically using the fourth-order Runge-Kutta method. Numerical analysis has shown that the present model’s parameters, such as the decentered parameter, laser intensity, modified electron density of plasma play a vital role in controlling the profile dynamics of the laser beam due to relativistic ponderomotive force and electrons Fermi temperature. A comparison was made between the self-focusing of a cosh-Gaussian laser beam in thermal quantum plasma and cold quantum plasma, when both relativistic and ponderomotive non-linear effects are considered. It is shown that increasing the decentered parameter in the cosh-Gaussian laser beam leads to a better reduction in self-focusing length. It has been observed that increasing the electron Fermi temperature increases self-focusing, resulting in a decrease in the focal length. Furthermore, it has been observed that self-focusing occurs earlier and becomes stronger with increasing laser intensity. It has been found that the cosh-Gaussian laser beam has caused better focusing in thermal quantum plasma compared to the Gaussian laser beam.
کلیدواژهها [English]
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