In GaAs lasers with a homogeneously broadened spontaneous emission line, spatial inhomogeneity of the inverted population can lead to multimode oscillation. In this paper the behavior of higher-order axial modes of Fabry-Perot GaAs lasers at 4.2° and 77°K is shown to be in good agreement with the theory of Statz and Tang, strongly supporting the model of spatial inhomogeneity. Since diffusion plays a prominent role in smoothing out these spatial inhomogeneities, the theory calls for, and the experiment verifies, that GaAs lasers must be pumped harder at higher temperature to produce oscillations in a given number of modes.
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Lavine et al. (1965) studied this question.
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