Random Laser Dynamics in Disordered and Semi ordered Cavities
Presented at IEEE RAPID 2021 (Aug 4, 2021) – Watch On-Demand
Random lasers are unique systems where lasing occurs via repetitive scattering in a disordered nanostructure with gain. Theoretical descriptions that can provide a framework for understanding temporal instabilities leading to high-intensity emission is lacking in the literature and requires a time-dependent theory that accounts for stability conditions. Herein, instability conditions for multimodal lasing will be derived from self-consistent time-dependent laser theory. An equation of motion describing relaxation oscillations in a CW random laser in the single-mode and multimode cases will be presented. Stability and equations of motion describing multimodal stability will be presented. Conditions leading to unstable behavior, as well as spatially-confined mixed instabilities and relaxation oscillations in multimode random lasing with spatial overlap will be discussed. These results apply to semi-ordered and totally random semiconducting lasers and can be generalized to other materials.
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