Department of Laser Physics, College of Science for Woman, University of Babylon, Babylon, Iraq.
In this work, the effect of type scattering centers on the performance of random laser systems has been studied, in particular the intensity of their emission spectrum, the width of the emission spectrum (FWHM), and the laser threshold. The effect of the semiplasmonic nanoparticles concentration was studied, separately, and it appeared through the experiment that the appropriate concentration of the dye must be chosen and a specific range of the concentrations of nanoparticles within the dye, so the performance of the Ag NPs random laser is studied at five different concentrations (500, 600, 700, 800 and 900 Pulse) for each of them. It has been found that the greatest emission intensity in Al NPs (approximately 19000 a.u.), the lowest laser threshold (40 𝜇J), and the lowest FWHM (12.5 nm) was obtained at the concentration of 800P. It was observed that these properties improved further by reaching the intensity of 21400 a.u., while the laser threshold and FWHM decreased to (35 𝜇J) and (10.5 nm), respectively when the concentration became 800P also.