Design and simulation of a GaN/AlGaN quantum cascade laser for terahertz emission
Our study indicates that there are significant advantages in developing THz quantum cascade lasers (QCLs) with GaN-based quantum well (QW) structures. While the ultrafast longitudinal optical (LO) phonon scattering in AlGaN/GaN QWs can be used for the rapid depopulation of the lower laser state, the large LO-phonon energy (?90meV) can effectively reduce the thermal population of the lasing states. Our investigation shows that GaN-based THz QCLs can potentially be operating cw at room temperature.
quantum cascade laser terahertz emission quantum wells gallium nitride