Investigation of DC Injection Lasers
A batch of injection lasers, based on epitaxial p-n junctions in gallium arsenide, was investigated under continuous working conditions using low currents at liquid-nitrogen temperature. When the laser threshold was crossed, the following effects were usually observed: the differential resistance of the laser diode became constant; the narrowing of the electroluminescence spectrum in the nonlasing modes stopped; the shift of the peak of the wide luminescence band with increasing current also stopped. These tendencies indicated uniform broadening of the emission band of an injection laser. Multimode laser emission was observed and the intensity of the radiation in the wings of the line continued to increase, and this increase was observed also at wavelengths shorter than the coherent emission wavelengths. In some cases, the voltage across a p-n junction continued to increase somewhat even under laser emission conditions. The random nature of the quantitative aspect of these deviations from uniformity confirmed an earlier suggestion of the spatial origin of the multimode emission.
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