Structural, morphological and random laser action for dye-znO nanoparticles in polymer films

Laser dye Rhodamine 6G (R6G) was incorporated in Poly MethyleMetha Acrylate (PMMA) polymer at different particles density from zinc oxide (ZnO) as (nanowire, nanoflower) synthesized using the hydrothermal method as random laser active medium. The thickness and emission spectra of the films were characterized by Scanning Electron Microscopy (SEM) and Fluorescence spectrum. The optimum results at the Width Half-Maximum (FWHM) are about (13, 11) nm for both ZnO wires and flower respectively at high pumping energy equal (20, 16) mJ respectively with optimum concentrations are 10-4mol/l .While Amplified Spontaneous Emission (ASE) was observe at low pumping intensity using Second Harmonic Generation(SHG) Nd-YAG pulse laser working at wavelength 532 nm. The homogeneous thickness of the films equal (14.6 –15) μm was used. Finally, the performances of ZnO random laser active medium for both shapes (wires and flowers) are determined via the relationship between the emission line and FWHM. From the results, appears that the maximum emission intensity depends on the particle shape, concentration and pumping intensity.