Recombination lasers in a flowing negative glow discharge
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A fast gas flow through a negative glow plasma creates an afterglow region where supercooled electrons are separated from energetic beam electrons to produce a population inversion by collisional recombination. We report spatially-resolved electron temperature measurements of the afterglow plasma showing electron temperatures in the range of 750-1100 K under steady-state conditions. A 4 cm long flowing hollow cathode discharge was used to obtain CW recombination laser oscillation in ArI. Collisional recombination of singly- and doubly-ionized metal vapor species in the same type of plasma has ...