Authors : Jassim M. Jassim, Yassin H. Khadim and Mithaq M. Mehdy Al-Sultani
Abstract: Four different mixtures of 10–33 mol/L styryl 9M laser dye, 0.1 g PMMA and one of TiO2 microparticles, Ag and ZnO nanoparticles weights 0.02, 0.04, 0.06 and 0.08 g had been prepared using chloroform solvent. The 4 different thin films had been made from these mixtures for each particles type using drop casting method. The absorption spectrums of these thin films had been taken. The absorption spectral properties as (peak wavelength, peak absorbance and frequency difference at half absorbance maximum) had been measured depending on the absorption spectrums for thin films. The non-linear optical properties as (transmittance difference △TP-V), non-linear phase shift △Φ0 , non-linear refractive index n;2 , minimum normalized transmittance T(Z) and non-linear absorption coefficient β) were calculated according to normalized transmittance data obtained from Z-scan setup with closed and open aperture. The effect of the particle size of the scattering centers in the linear and nonlinear optical properties of the styryl 9M laser doped in PMMA thin films had been studied. The main conclusion is that the Ag nanoparticles causes a shift of the absorption wavelengths to longer wavelengths (red shift), so, this helps in choosing the medium and nanoparticles with appropriate excitation wavelengths.
Jassim M. Jassim, Yassin H. Khadim and Mithaq M. Mehdy Al-Sultani, 2018. Study the Effect of the Particle Size of the Scattering Centers in Each of Linear and Non-Linear Optical Properties for the Laser Random Media. Journal of Engineering and Applied Sciences, 13: 80-88.