WIAS Preprint No. 2502, (2018)

Chirped photonic crystal for spatially filtered optical feedback to a broad-area laser



Authors

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

2010 Mathematics Subject Classification

  • 35B27 65M80 78A45 78A46 78A60 78M50

2008 Physics and Astronomy Classification Scheme

  • 42.60.By 42.60.Da 42.60.Fc 42.60.Jf 42.70.Qs

Keywords

  • External resonators, periodic structure, rigorous coupled wave analysis, inverse scattering problems, semiconductor laser diodes

DOI

10.20347/WIAS.PREPRINT.2502

Abstract

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.

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