Interaction of laser radiation with matter. Laser plasmas

Model of intensity redistribution in a pair of laser beams intersecting in a plasma

S. V. Bondarenko, I. R. Smagin, O. O. Sharov

Federal State Unitary Enterprise "Russian Federal Nuclear Center — All-Russian Research Institute of Experimental Physics", Sarov, Nizhny Novgorod region

Abstract: A physico-mathematical model is proposed that makes it possible to estimate the level of energy transfer in two laser beams intersecting in a target plasma [cross-beam energy transfer (CBET) effect] during the interaction of incident and reflected radiation from the turning point for a self-similar profile of a plane isothermal rarefaction wave. The position of the three-wave resonance point is determined taking into account the frequency shift of electromagnetic radiation that occurs when it propagates in a nonstationary plasma corona, as well as when radiation is reflected from a moving turning point. It is shown that two three-wave resonance points can exist on the self-similar profile, where the energy is transferred between the beams in opposite directions.

Keywords: direct irradiation target, cross-beam energy transfer, ion acoustic wave, inverse bremsstrahlung.

Received: 23.11.2022
Accepted: 23.11.2022