Vol. 50, Issue 2, pp. 311-321

Vol. 50 Issue 2 pp. 311-321

Influence of InGaN waveguide on injection efficiency in III-nitride laser diodes

Mateusz Hajdel, Grzegorz Muzioł, Krzesimir Nowakowski-Szkudlarek, Marcin Siekacz, Paweł Wolny, Czesław Skierbiszewski

Keywords

InGaN, laser diodes, waveguide, injection efficiency

Abstract

The influence of using InGaN waveguides on blue laser diodes was theoretically studied using 1D drift diffusion model and 2D optical mode calculation. Despite of the known effect of increased confinement of an optical mode, especially for long wavelengths, an unexpected influence on the efficiency of carrier injection into the active region is discussed. It is found that InGaN-AlGaN interface is crucial to achieving high injection efficiency. A numerical model is created, which describes the influence of InGaN waveguide and Mg doping of electron blocking layer on basic properties of laser diodes. It is found that an increase of injection efficiency allows to reduce the doping level in an electron blocking layer and take advantage of decreased optical losses.

Vol. 50
Issue 2
Article No: 14
pp. 311-321

0.55 MB
OPTICA APPLICATA - a quarterly of the Wrocław University of Science and Technology, Faculty of Fundamental Problems of Technology