This document may be downloaded, read, stored and printed for your own use within the limits of § 53 UrhG but it may not be distributed via the internet or passed on to external parties.Dieses Dokument darf im Rahmen von § 53 UrhG zum eigenen Gebrauch kostenfrei heruntergeladen, gelesen, gespeichert und ausgedruckt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.Brée, CarstenGailevicius, DariusPurlys, VytautasWerner, Guillermo GarreStaliunas, KestutisRathsfeld, AndreasSchmidt, GuntherRadziunas, Mindaugas2018-07-312019-06-2820182198-5855https://doi.org/10.34657/2109https://oa.tib.eu/renate/handle/123456789/1737We 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.application/pdfeng510External resonatorsperiodic structurerigorous coupled wave analysisinverse scattering problemssemiconductor laser diodesReport