Abstract
We have studied stimulated emission in a random laser based on rhodamine 6G dye andTiO2 nanoparticles. At both small and large concentrations of nanoparticles,the minimum threshold was found at ultra-high concentrations of dye,20 g L−1. With the increasein concentration of TiO2 nanoparticles, the threshold reaches its maximum at the transition from aweak-scattering regime to a strong-scattering regime, when the transport mean free pathlt is approximately equal to the absorption lengthla. At the samevalue of lt, the random laser emission qualitatively changes its behavior. The experimental results arein good agreement with the predictions of a heuristic model.
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