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.
In this work, preparation of zinc nanostructured thin films using the pulsed laser deposition (PLD) technique has been
described. Optical absorption spectera of the thin films have been obtained by Spectrophotometry. Morphology and
mean size of nanoparticles in the prepared nanostructured thin films were obtained by Atomic Force Microscopy.
Nonlinear optical properties of the films have been investigated using the well-known Z-scan technique. Our
measurements indicate positive signs for both nonlinear optical absorption coefficients and refraction indices of the
nanostructured zinc thin films. The used method for measuring the optical limiting properties of the thin films and its
results are also represented.