Fig. 3
From: Practical implementation of m-Plane GaN resonant-phonon Terahertz quantum cascade laser
(a) Optical gain as a function of photon frequency at different temperatures at a bias voltage of 145 mV/module excited states are included and (b) Optical gain as a function of photon frequency at different temperatures at a bias voltage of 145 mV/module excited states are not included.
