Effect of ZnO Nanoparticles Weight Content on Lasing Threshold of Fluorescein Dye-Based Random Lasers

Abstract

In this work, ZnO nanoparticles with different weight contents (0.01, 0.03, 0.05, 0.07, and 0.09 mg) were incorporated in solid solutions of fluorescein laser dye dissolved in epichlorohydrin resin to fabricate random gain media. The effects of ZnO nanoparticles weight content on the pumping threshold and emission intensity were introduced. Lower contents showed higher threshold levels whereas the higher contents has decreased the threshold level due to increasing the scattering centers and hence amplification of random laser signal. This attempt is required to optimize the design parameters of random lasers based on fluorescein/ZnO nanoparticles nanocomposites.