High-power AlGaAs/GaAs quantum-well injection laser with a wide contact and a narrow angular distribution

An investigation was made of the spectral and the space-time characteristics of the radiation emitted by Al_xGa_1–xAs/GaAs quantum-well injection lasers with a wide contact. The single-lobe angular divergence was equal to the diffraction limit (0.5°) near the lasing threshold and it increased 1.5-fold when the threshold was exceeded threefold. The power of the radiation emitted in the form of pulses amounted to 150 mW when the pump current was I = 3I _th.