Abstract
In narrow-gap semiconductors, the energy of conduction-electron plasma oscillations can be made equal to the band gap by doping. When such a crystal is pumped with an electron beam or light wave, stimulated emission of plasma waves takes place. Estimates of growth rate suggest that, in ${\mathrm{Pb}}_{1\ensuremath{-}X}{\mathrm{Sn}}_{X}\mathrm{Se}$ and ${\mathrm{Pb}}_{1\ensuremath{-}X}{\mathrm{Sn}}_{X}\mathrm{Te}$ alloys, collisional losses can be overcome and the plasma waves excited to high amplitude.
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