Theoretical Modeling of Recombination Gain in LiIII Transition to Ground State

We present numerical calculation of recombination gain in LiIII transition to ground state (2 → 1). The model includes the initial ionization of the plasma by an intense fs laser pulse, and continues through the expansion and cooling of the plasma simultaneously with the recombination process. We show that although initial estimations of the energy absorption by the plasma from the ionization laser does not allow for recombination gain, the expansion and cooling processes that take place immediately after ionization, in addition to the non‐Maxwellian distribution of electrons in the plasma, give rise to high gain under feasible experimental conditions.