Space-time characteristics of radiation of single-mode injection lasers

The space-time nonuniformity of the emission of injection lasers operating in the fundamental transverse mode and having emission-region lengths less than 10 microns is investigated experimentally using the techniques described by Koval et al. (1981). The devices analyzed are GaAs/GaAlAs transverse p-n-junction or mesa-stripe-contact injection lasers with cavity lengths 200-250 microns and threshold currents 30-35 and 45-60 mA, respectively. The results are presented in graphs and discussed. It is found that the divergence of the laser light near the threshold can be determined by combining the directional patterns of the spontaneous and stimulated emissions.