Optically pumped $GaN∕AlGaN$ separate-confinement heterostructure laser grown along the $(112¯0)$ nonpolar direction Available to Purchase

This letter concerns experiments on optically pumped $GaN∕AlGaN$ separate-confinement heterostructure laser structures grown by plasma assisted molecular beam epitaxy. The structures were grown along the $(112¯0)$ nonpolar crystallographic direction on a bulk GaN substrate. Different widths of GaN quantum wells were applied in the studied structures. Laser action is clearly demonstrated by the spontaneous emission saturation, abrupt line narrowing, and strong TE polarization of output light. A lasing threshold was reached at an excitation power density of $260kW∕cm2$ for a $700-μm$-long cavity at room temperature.