Near-field and far-field dynamics of (Al,In)GaN laser diodes

摘要

For blue (Al,In)GaN laser diodes we measure the evolution of the laser beam during its propagation from near-field to far-field. We reconstruct the near-field phase distribution of the waveguide mode. The dynamic behaviour is a tilting of the phase front and a far-field beam-steering on a 10ns to 100ns time scale. These observations are discussed in the context of the carrier induced change of the refractive index associated with the antiguiding factor and of thermal dynamics.