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The features of silver nanowire random laser (different sizes and concentrations)-based random lasers with a fixed concentration of laser dye rhodamine B pumped by a nanosecond pulsed laser were indicated. It was shown that the sizes and concentrations of scattering centers greatly affect the optical amplification mechanism, thresholds, narrowing the emission intensity and then the transition from the incoherent to a coherent type of random laser. The emergence of spikes and the increase in their number are also discussed under the influence of the size and concentration of silver (Ag) nanowires. The gain narrowing and the enhancement factor were calculated to reinforce obtained results. [ABSTRACT FROM AUTHOR]

Green–blue plasmonic random laser is attained by two-dimensional plexcitonic structure. The main gain plexcitonic media contained two-dimensional periodic arrays of gold nanowires which is covered by dye layer. Due to the change in the strength of exciton and plasmon coupling in these plexcitonic gain structures, different close loop, and thus random lasing must be takes place. For this purpose, we fabricate six samples with different plexcitonic power and pumped fabricated two-dimensional nanostructures by green nanosecond pulsed laser. Our results show efficient coherent random lasing due to the plexcitonic nanostructure in the blue, because two-photon absorption and also green part of the visible spectral region considering its applicability in the design and fabrication of compact and miniaturized random laser sources. [ABSTRACT FROM AUTHOR]