Fig. 7
From: Practical implementation of m-Plane GaN resonant-phonon Terahertz quantum cascade laser

Optical gain as a function of photon energy at a bias voltage of 145 mV/module at 10 K for different values of in-depth roughness height.
From: Practical implementation of m-Plane GaN resonant-phonon Terahertz quantum cascade laser

Optical gain as a function of photon energy at a bias voltage of 145 mV/module at 10 K for different values of in-depth roughness height.