The possibility of lasing in Ne+Ar ionic molecules pumped by a hard ioniser

The kinetic model of relaxation in the Ne — Ar — Kr mixture pumped by a hard ioniser is constructed in connection with the analysis of the possibility of lasing at the Ne⁺Ar → NeAr⁺ transition of the inert-gas ionic exciplexes. The calculations based on the typical rates of plasmachemical reactions demonstrate that the lasing is possible but difficult to realise: One needs high pressures (greater than 16 bar) and high pumping densities (~1 MW cm^–3). In the most favourable cases, the laser efficiency lies between 0.05 and 0.25%.