Gold nanoparticles were produced by laser ablation method in distilled water. In order to produce nanoparticles with different sizes, laser pulse energy was changed in the production process. Then an equal amount of different nanoparticles were compound with PVA in water and solution was dried on a plane plate in air to obtain PVA doped Au nanoparticles films with thickness of 0.2 mm. UV-Vis-NIR spectroscopy was employed to study the optical properties of films. Nonlinear refractive index of samples was measured using Z-scan method.

Keywords: Au nanoparticles, Linear and nonlinear optical, Technique z- scan

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