Radiative characteristics of injection lasers with short resonators

An investigation was made of the threshold, power, and spectral characteristics of radiation emitted by GaAs–AlAs heterostructure injection lasers with double confinement and short (up to 16 μ) plane-parallel resonators. The lasers had mesastripe contacts 10–14 μ wide. The gain coefficient was a linear function of the pump current density in the gain coefficient range 10–400 cm^–1. The minimum threshold currents in the lasers were 27–30 mA and single-frequency lasing regime was observed right up to pump currents of (1.6–1.7) I_th. The maximum single-frequency output power was 35 mW. It should be possible to retain singlefrequency regime in such lasers when the pump current was subjected to high-frequency modulation.