2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/105276This paper describe a numerical simulation method for the interaction between laser pulses and low density plasmas based on hydrodynamic approximation. We investigate Backward Raman Amplifying (BRA) experiments and their variants. The numerical results are in good agreement with experiments.11 pages, 4 figursPlasma Physicstext