2018, Brée, Carsten, Gailevicius, Darius, Purlys, Vytautas, Werner, Guillermo Garre, Staliunas, Kestutis, Rathsfeld, Andreas, Schmidt, Gunther, Radziunas, Mindaugas

We derive and analyze an efficient model for reinjection of spatially filtered optical feedback from an external resonator to a broad area, edge emitting semiconductor laser diode. Spatial filtering is achieved by a chirped photonic crystal, with variable periodicity along the optical axis and negligible resonant backscattering. The optimal chirp is obtained from a genetic algorithm, which yields solutions that are robust against perturbations. Extensive numerical simulations of the composite system with our optoelectronic solver indicate that spatially filtered reinjection enhances lower-order transversal optical modes in the laser diode and, consequently, improves the spatial beam quality.