Pulse stimulated emission from beryllium vapor
It was demonstrated that stimulated emission was possible as the result of several transitions in the spectrum of Be II. An experimental study was made of the stimulated emission due to the following ionic transitions in beryllium: 4F–3D at λ = 467.5 nm, 4S–3P at λ = 527.2 nm, and 3P–3S at λ = 1209.6 nm, all which occurred during the afterglow stage of a pulse discharge. It was established that the laser levels were pumped by charge exchange between helium or neon ions and beryllium atoms, and also due to recombination of doubly charged beryllium ions. It was found that the population inversion and the characteristics of stimulated emission were influenced strongly by inelastic collisions with slow electrons.