High-Efficiency Blue and True-Green-Emitting Laser Diodes Based on Non-c-Plane Oriented GaN Substrates

Using non-c-plane bulk GaN substrates, we demonstrate continuous-wave single-mode blue-emitting laser diodes operating with over 23% wall plug efficiency and over 750mW output power, which represent the highest values reported to date. Furthermore, we demonstrate continuous-wave 520nm green-emitting laser diodes with over 60mW output power and 1.9% wall plug efficiency. The rapid performance evolution of laser diodes fabricated on non-c-plane orientations is validation of the benefits resulting from increased electron-hole overlap, reduced effective hole mass, and increased design flexibility. (C) 2010 The Japan Society of Applied Physics