We report on the experimental demonstration of considerable lowering of stimulated luminescence (lasing) threshold in R6G laser dye solution doped with metal agglomerates (Ag, Al, Ni) upon second harmonic of Nd:YAG-laser illumination. Due to strong structural coupling between individual nanoparticles, they may form fractal agglomerates providing an extreme optical pump-field enhancement near their complicated surface. For the first time, we have observed more than twofold increase in lasing efficiency of metal aggregated dye solution as compared to non-agglomerated monomeric metal nanocolloids. No random laser manifestation or surface plasmon-polariton resonances excitations were observed.

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In this paper describes an acoustic investigation of the influence of nonlinear thermal processes in the lasing dye Rhodamine 6G with silver nanoparticles of different morphology. Determined the dynamic range of pump energy at which there is no destruction of the working substance under the influence of thermal processes.