Waveguide design of green InGaN laser diodes

Abstract In this paper we investigate the waveguiding (WG) of direct green InGaN laser diodes grown on c‐plane GaN substrates. The problem of parasitic modes emerges due to the reduced refractive index difference between the GaN waveguide and AlGaN cladding layers for green compared to blue emitting laser diodes. We discuss several approaches to avoid substrate modes. We investigate different materials and designs for optimized WG of green InGaN laser diodes using a 1D transfer matrix simulation tool.