Non-resonant feedback to enhance conventional lasing in advanced materials

This paper developed a theoretical approach, which models the behaviour of gain media with very weak scattering centers, to understand the role of the nonresonant feedback (NRF) mechanism in the aforementioned laser efficiency enhancement. By using a formalism of rate equations properly modified, the main spectral, temporal and spatial features of the observed NRF enhancement are accounted for. The proposed model provides theoretical insights about the enhanced conventional laser emission in gain media doped with weak scattering centers and establishes the limits for the regime where gain dominates over scattering losses.