<p>This study presents the design of novel optical devices based on a two-dimensional active random structure composed of gain-mixed scattering centers. By modulating the input power and leveraging the dynamic light scattering intensity of nanoparticles, we achieved successful laser emission within this two-dimensional random structure. Using a yttrium aluminum garnet (SGR) laser experimental platform, we systematically observed the entire evolution process from optical amplification to random lasing. Our analysis focused on the photon transmission characteristics under varying scattering intensity conditions, enabling precise determination of the corresponding lasing thresholds. The experiments revealed, for the first time, that the near-field coupling effect between excitons in the gain-mixed scattering centers under optical excitation facilitates efficient non-radiative energy transfer to dye molecules. Furthermore, when the microcavity (capillary tube: a hollow, low-finesse waveguide for guiding light and containing samples.) resonates with the randomly distributed scattered light from these centers, the system’s lasing threshold can be significantly reduced. We investigated a population-inversion-based random lasing mechanism in dye-doped scattering centers driven by a strongly pumped laser. In this system, lasing arises simultaneously from population inversion and multi-light scattering within the active medium. The system transitions from population-inversion-based multimode lasing to single-mode lasing. Our experiments demonstrate that this lasing mechanism operates within the timescale of a 10 ns pump pulse.</p>