<![CDATA[Four different mixtures of ( 10-3 mol/l Rhoda mine B laser dye , 0.1 gm PMMA and one of Ag nano particles weights ( 0.02 gm ,0.04 gm , 0.06 gm and 0.08 gm ) ) had been prepared using chloroform solvent .Four different thin films had been made from these mixtures using drop casting method .The absorption spectrums of these thin films had been taken . The absorption spectral properties as (peak wave length, 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 ) ,Non –linear phase shift , Non-linear Refractive index , Minimum normalized transmittance and Non-linear absorption coefficient ) were calculated according to normalized transmittance data obtained from Z—scan setup with closed and open aperture .The main conclusion is that the Ag nano particles causes a shift of the absorption wavelengths to longer wavelengths ( red shift ) , so this helps in choosing the medium and nano particles with appropriate excitation wavelengths .Keywords: Rhoda mine B laser dye, Ag nano particles, Linear, Non-linear, Properties. ]]>
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