Portland State University. Department of Physics
Term of Graduation
Date of Publication
Master of Science (M.S.) in Physics
1 online resource (viii, 46 pages)
In this thesis, we explore the preparation of random lasers (RLs) using solution-deposited, randomly packed nano-particle films of zinc oxide (ZnO) impregnated with silicon dioxide (SiO2) nanospheres. RLs have their scatterers randomly oriented, while their lasing comes from light propagating along closed paths through the scattering environment. It is shown here that random lasing is readily observed in films made of submicron sized ZnO particles. Adding transparent SiO2 nanospheres to the films, we show there is an effective improvement of the lasing that is observable in all of the samples spectra. Specifically, we found that the lasing thresholds were lowered, the linewidths decreased, and the lasing output increased as compared to our pure ZnO films. In the best films the spheres occupied a volume of approximately 53%. We also analyzed films with fluorescent pink poly Latex spheres (Latex spheres) in the ZnO. These films did not produce random lasing, however, likely due to damage occurring in these polymeric spheres under optical pumping.
© 2021 Benito Reynaldo Resendiz
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Resendiz, Benito Reynaldo, "Random Lasing in Nano-Crystalline Zinc-Oxide Films" (2022). Dissertations and Theses. Paper 5894.