Nonuniform emission characteristics of electron-beam-pumped dislocation-free GaAs lasers

Filamentary and other nonuniform emission characteristics have been observed from electron-beam-pumped dislocation-free GaAs lasers. X-ray topographs taken before and after bombardment showed relatively few dislocations present in the as-grown material and no dislocation introduced at the power levels used for electron-beam excitation.