Numerical modeling of the spatial and spectro-temporal behavior of wide-aperture unstable resonator semiconductor lasers

摘要

We propose a numerical model adapted to the analysis of the (sub)picosecond dynamics of broad area semiconductor optical systems with a simultaneous description of the 2-D spatial and spectral behaviors. The model combines the advantages of the beam propagation method and time-domain method and treats the 2-D spatial inhomogeneities of the laser structure as well as the gain nonlinearities, the finite gain bandwidth, the presence of grating reflectors and the optical index dependence on carrier concentration. The model is applied to simulate the transient response of a DBR unstable cavity laser under current step excitation. The CW regime is calculated as a limit of the dynamic one.