In this study, Au colloidal nanoparticle is performed by laser ablation method. The linear and nonlinear absorption of the
laser dye Rhodamine B dissolved in DI water with and without the presence of Au nanoparticles were investigated. The
emission spectra of the samples were studied. Results show the red shift of the fluorescence emission in the case of dye
with the presence of Au nanoparticles. The measurement of nonlinear absorption in Au, Au/Rhodamine B and
Rhodamine B solutions were carried out using the standard Z-scan technique. Our measurements indicate positive signs
for the nonlinear optical absorption coefficients of the samples.
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