EuNPC2015

Inverse bremsstrahlung absorption, (IBA), is the most efficient absorption mechanism in laser-fusion plasma. IBA is the process where an electron absorbs a photon during of colliding to an ion or to another electron. IBA of laser energy in homogeneous and unmagnetized plasma has been studied using the Fokker-Planck equation, f0. This equation is an isotropic q-non-extensive electrons distribution function. Considering a circular-polarized laser wave and kinetic theory with the using spherical coordinates we get f_1 that is anisotropic function, then absorption is calculable. A pulsed laser is considered and effect of the physical parameters such as temperature and q (q is a parameter quantifying the degree of nonextensivity) have been studied on the absorption value, then the results are compared with continuous lasers. The calculations of IBA were performed for various q. In this paper we can deduce from calculations, IBA in near of critical layer using continuous lasers is higher than pulsed lasers, also absorption increases with q parameter and it decreases as the temperature increases.