Temporal and Spatial Gain in Stimulated Light Scattering

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Abstract
The theory of scattered light waves with exponential temporal and spatial gain is investigated in the linearized approximation for a number of different cases of material excitation. Regions of weakly coupled gain (the rate-equation approximation) and strongly coupled gain are found. A group velocity for the scattered wave is introduced to facilitate the analysis. Gain is found for the case where the material excitations lose their uncoupled character.