WIAS Preprint No. 2502, (2018)

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


  • 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


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




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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